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ethstats-server/web-app/.meteor/local/build/programs/server/packages/mongo.js

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add meteor frontend app
2015-08-14 19:22:53 +02:00
(function () {
/* Imports */
var Meteor = Package.meteor.Meteor;
var Random = Package.random.Random;
var EJSON = Package.ejson.EJSON;
var _ = Package.underscore._;
var LocalCollection = Package.minimongo.LocalCollection;
var Minimongo = Package.minimongo.Minimongo;
var Log = Package.logging.Log;
var DDP = Package.ddp.DDP;
var DDPServer = Package.ddp.DDPServer;
var Tracker = Package.tracker.Tracker;
var Deps = Package.tracker.Deps;
var check = Package.check.check;
var Match = Package.check.Match;
var MaxHeap = Package['binary-heap'].MaxHeap;
var MinHeap = Package['binary-heap'].MinHeap;
var MinMaxHeap = Package['binary-heap'].MinMaxHeap;
var Hook = Package['callback-hook'].Hook;
/* Package-scope variables */
var MongoInternals, MongoTest, Mongo, MongoConnection, CursorDescription, Cursor, listenAll, forEachTrigger, OPLOG_COLLECTION, idForOp, OplogHandle, ObserveMultiplexer, ObserveHandle, DocFetcher, PollingObserveDriver, OplogObserveDriver, LocalCollectionDriver;
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/mongo_driver.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
/** // 1
* Provide a synchronous Collection API using fibers, backed by // 2
* MongoDB. This is only for use on the server, and mostly identical // 3
* to the client API. // 4
* // 5
* NOTE: the public API methods must be run within a fiber. If you call // 6
* these outside of a fiber they will explode! // 7
*/ // 8
// 9
var path = Npm.require('path'); // 10
var MongoDB = Npm.require('mongodb'); // 11
var Fiber = Npm.require('fibers'); // 12
var Future = Npm.require(path.join('fibers', 'future')); // 13
// 14
MongoInternals = {}; // 15
MongoTest = {}; // 16
// 17
MongoInternals.NpmModules = { // 18
mongodb: { // 19
version: Npm.require('mongodb/package.json').version, // 20
module: MongoDB // 21
} // 22
}; // 23
// 24
// Older version of what is now available via // 25
// MongoInternals.NpmModules.mongodb.module. It was never documented, but // 26
// people do use it. // 27
// XXX COMPAT WITH 1.0.3.2 // 28
MongoInternals.NpmModule = MongoDB; // 29
// 30
// This is used to add or remove EJSON from the beginning of everything nested // 31
// inside an EJSON custom type. It should only be called on pure JSON! // 32
var replaceNames = function (filter, thing) { // 33
if (typeof thing === "object") { // 34
if (_.isArray(thing)) { // 35
return _.map(thing, _.bind(replaceNames, null, filter)); // 36
} // 37
var ret = {}; // 38
_.each(thing, function (value, key) { // 39
ret[filter(key)] = replaceNames(filter, value); // 40
}); // 41
return ret; // 42
} // 43
return thing; // 44
}; // 45
// 46
// Ensure that EJSON.clone keeps a Timestamp as a Timestamp (instead of just // 47
// doing a structural clone). // 48
// XXX how ok is this? what if there are multiple copies of MongoDB loaded? // 49
MongoDB.Timestamp.prototype.clone = function () { // 50
// Timestamps should be immutable. // 51
return this; // 52
}; // 53
// 54
var makeMongoLegal = function (name) { return "EJSON" + name; }; // 55
var unmakeMongoLegal = function (name) { return name.substr(5); }; // 56
// 57
var replaceMongoAtomWithMeteor = function (document) { // 58
if (document instanceof MongoDB.Binary) { // 59
var buffer = document.value(true); // 60
return new Uint8Array(buffer); // 61
} // 62
if (document instanceof MongoDB.ObjectID) { // 63
return new Mongo.ObjectID(document.toHexString()); // 64
} // 65
if (document["EJSON$type"] && document["EJSON$value"] // 66
&& _.size(document) === 2) { // 67
return EJSON.fromJSONValue(replaceNames(unmakeMongoLegal, document)); // 68
} // 69
if (document instanceof MongoDB.Timestamp) { // 70
// For now, the Meteor representation of a Mongo timestamp type (not a date! // 71
// this is a weird internal thing used in the oplog!) is the same as the // 72
// Mongo representation. We need to do this explicitly or else we would do a // 73
// structural clone and lose the prototype. // 74
return document; // 75
} // 76
return undefined; // 77
}; // 78
// 79
var replaceMeteorAtomWithMongo = function (document) { // 80
if (EJSON.isBinary(document)) { // 81
// This does more copies than we'd like, but is necessary because // 82
// MongoDB.BSON only looks like it takes a Uint8Array (and doesn't actually // 83
// serialize it correctly). // 84
return new MongoDB.Binary(new Buffer(document)); // 85
} // 86
if (document instanceof Mongo.ObjectID) { // 87
return new MongoDB.ObjectID(document.toHexString()); // 88
} // 89
if (document instanceof MongoDB.Timestamp) { // 90
// For now, the Meteor representation of a Mongo timestamp type (not a date! // 91
// this is a weird internal thing used in the oplog!) is the same as the // 92
// Mongo representation. We need to do this explicitly or else we would do a // 93
// structural clone and lose the prototype. // 94
return document; // 95
} // 96
if (EJSON._isCustomType(document)) { // 97
return replaceNames(makeMongoLegal, EJSON.toJSONValue(document)); // 98
} // 99
// It is not ordinarily possible to stick dollar-sign keys into mongo // 100
// so we don't bother checking for things that need escaping at this time. // 101
return undefined; // 102
}; // 103
// 104
var replaceTypes = function (document, atomTransformer) { // 105
if (typeof document !== 'object' || document === null) // 106
return document; // 107
// 108
var replacedTopLevelAtom = atomTransformer(document); // 109
if (replacedTopLevelAtom !== undefined) // 110
return replacedTopLevelAtom; // 111
// 112
var ret = document; // 113
_.each(document, function (val, key) { // 114
var valReplaced = replaceTypes(val, atomTransformer); // 115
if (val !== valReplaced) { // 116
// Lazy clone. Shallow copy. // 117
if (ret === document) // 118
ret = _.clone(document); // 119
ret[key] = valReplaced; // 120
} // 121
}); // 122
return ret; // 123
}; // 124
// 125
// 126
MongoConnection = function (url, options) { // 127
var self = this; // 128
options = options || {}; // 129
self._observeMultiplexers = {}; // 130
self._onFailoverHook = new Hook; // 131
// 132
var mongoOptions = {db: {safe: true}, server: {}, replSet: {}}; // 133
// 134
// Set autoReconnect to true, unless passed on the URL. Why someone // 135
// would want to set autoReconnect to false, I'm not really sure, but // 136
// keeping this for backwards compatibility for now. // 137
if (!(/[\?&]auto_?[rR]econnect=/.test(url))) { // 138
mongoOptions.server.auto_reconnect = true; // 139
} // 140
// 141
// Disable the native parser by default, unless specifically enabled // 142
// in the mongo URL. // 143
// - The native driver can cause errors which normally would be // 144
// thrown, caught, and handled into segfaults that take down the // 145
// whole app. // 146
// - Binary modules don't yet work when you bundle and move the bundle // 147
// to a different platform (aka deploy) // 148
// We should revisit this after binary npm module support lands. // 149
if (!(/[\?&]native_?[pP]arser=/.test(url))) { // 150
mongoOptions.db.native_parser = false; // 151
} // 152
// 153
// XXX maybe we should have a better way of allowing users to configure the // 154
// underlying Mongo driver // 155
if (_.has(options, 'poolSize')) { // 156
// If we just set this for "server", replSet will override it. If we just // 157
// set it for replSet, it will be ignored if we're not using a replSet. // 158
mongoOptions.server.poolSize = options.poolSize; // 159
mongoOptions.replSet.poolSize = options.poolSize; // 160
} // 161
// 162
self.db = null; // 163
// We keep track of the ReplSet's primary, so that we can trigger hooks when // 164
// it changes. The Node driver's joined callback seems to fire way too // 165
// often, which is why we need to track it ourselves. // 166
self._primary = null; // 167
self._oplogHandle = null; // 168
self._docFetcher = null; // 169
// 170
// 171
var connectFuture = new Future; // 172
MongoDB.connect( // 173
url, // 174
mongoOptions, // 175
Meteor.bindEnvironment( // 176
function (err, db) { // 177
if (err) { // 178
throw err; // 179
} // 180
// 181
// First, figure out what the current primary is, if any. // 182
if (db.serverConfig._state.master) // 183
self._primary = db.serverConfig._state.master.name; // 184
db.serverConfig.on( // 185
'joined', Meteor.bindEnvironment(function (kind, doc) { // 186
if (kind === 'primary') { // 187
if (doc.primary !== self._primary) { // 188
self._primary = doc.primary; // 189
self._onFailoverHook.each(function (callback) { // 190
callback(); // 191
return true; // 192
}); // 193
} // 194
} else if (doc.me === self._primary) { // 195
// The thing we thought was primary is now something other than // 196
// primary. Forget that we thought it was primary. (This means // 197
// that if a server stops being primary and then starts being // 198
// primary again without another server becoming primary in the // 199
// middle, we'll correctly count it as a failover.) // 200
self._primary = null; // 201
} // 202
})); // 203
// 204
// Allow the constructor to return. // 205
connectFuture['return'](db); // 206
}, // 207
connectFuture.resolver() // onException // 208
) // 209
); // 210
// 211
// Wait for the connection to be successful; throws on failure. // 212
self.db = connectFuture.wait(); // 213
// 214
if (options.oplogUrl && ! Package['disable-oplog']) { // 215
self._oplogHandle = new OplogHandle(options.oplogUrl, self.db.databaseName); // 216
self._docFetcher = new DocFetcher(self); // 217
} // 218
}; // 219
// 220
MongoConnection.prototype.close = function() { // 221
var self = this; // 222
// 223
if (! self.db) // 224
throw Error("close called before Connection created?"); // 225
// 226
// XXX probably untested // 227
var oplogHandle = self._oplogHandle; // 228
self._oplogHandle = null; // 229
if (oplogHandle) // 230
oplogHandle.stop(); // 231
// 232
// Use Future.wrap so that errors get thrown. This happens to // 233
// work even outside a fiber since the 'close' method is not // 234
// actually asynchronous. // 235
Future.wrap(_.bind(self.db.close, self.db))(true).wait(); // 236
}; // 237
// 238
// Returns the Mongo Collection object; may yield. // 239
MongoConnection.prototype.rawCollection = function (collectionName) { // 240
var self = this; // 241
// 242
if (! self.db) // 243
throw Error("rawCollection called before Connection created?"); // 244
// 245
var future = new Future; // 246
self.db.collection(collectionName, future.resolver()); // 247
return future.wait(); // 248
}; // 249
// 250
MongoConnection.prototype._createCappedCollection = function ( // 251
collectionName, byteSize, maxDocuments) { // 252
var self = this; // 253
// 254
if (! self.db) // 255
throw Error("_createCappedCollection called before Connection created?"); // 256
// 257
var future = new Future(); // 258
self.db.createCollection( // 259
collectionName, // 260
{ capped: true, size: byteSize, max: maxDocuments }, // 261
future.resolver()); // 262
future.wait(); // 263
}; // 264
// 265
// This should be called synchronously with a write, to create a // 266
// transaction on the current write fence, if any. After we can read // 267
// the write, and after observers have been notified (or at least, // 268
// after the observer notifiers have added themselves to the write // 269
// fence), you should call 'committed()' on the object returned. // 270
MongoConnection.prototype._maybeBeginWrite = function () { // 271
var self = this; // 272
var fence = DDPServer._CurrentWriteFence.get(); // 273
if (fence) // 274
return fence.beginWrite(); // 275
else // 276
return {committed: function () {}}; // 277
}; // 278
// 279
// Internal interface: adds a callback which is called when the Mongo primary // 280
// changes. Returns a stop handle. // 281
MongoConnection.prototype._onFailover = function (callback) { // 282
return this._onFailoverHook.register(callback); // 283
}; // 284
// 285
// 286
//////////// Public API ////////// // 287
// 288
// The write methods block until the database has confirmed the write (it may // 289
// not be replicated or stable on disk, but one server has confirmed it) if no // 290
// callback is provided. If a callback is provided, then they call the callback // 291
// when the write is confirmed. They return nothing on success, and raise an // 292
// exception on failure. // 293
// // 294
// After making a write (with insert, update, remove), observers are // 295
// notified asynchronously. If you want to receive a callback once all // 296
// of the observer notifications have landed for your write, do the // 297
// writes inside a write fence (set DDPServer._CurrentWriteFence to a new // 298
// _WriteFence, and then set a callback on the write fence.) // 299
// // 300
// Since our execution environment is single-threaded, this is // 301
// well-defined -- a write "has been made" if it's returned, and an // 302
// observer "has been notified" if its callback has returned. // 303
// 304
var writeCallback = function (write, refresh, callback) { // 305
return function (err, result) { // 306
if (! err) { // 307
// XXX We don't have to run this on error, right? // 308
refresh(); // 309
} // 310
write.committed(); // 311
if (callback) // 312
callback(err, result); // 313
else if (err) // 314
throw err; // 315
}; // 316
}; // 317
// 318
var bindEnvironmentForWrite = function (callback) { // 319
return Meteor.bindEnvironment(callback, "Mongo write"); // 320
}; // 321
// 322
MongoConnection.prototype._insert = function (collection_name, document, // 323
callback) { // 324
var self = this; // 325
// 326
var sendError = function (e) { // 327
if (callback) // 328
return callback(e); // 329
throw e; // 330
}; // 331
// 332
if (collection_name === "___meteor_failure_test_collection") { // 333
var e = new Error("Failure test"); // 334
e.expected = true; // 335
sendError(e); // 336
return; // 337
} // 338
// 339
if (!(LocalCollection._isPlainObject(document) && // 340
!EJSON._isCustomType(document))) { // 341
sendError(new Error( // 342
"Only plain objects may be inserted into MongoDB")); // 343
return; // 344
} // 345
// 346
var write = self._maybeBeginWrite(); // 347
var refresh = function () { // 348
Meteor.refresh({collection: collection_name, id: document._id }); // 349
}; // 350
callback = bindEnvironmentForWrite(writeCallback(write, refresh, callback)); // 351
try { // 352
var collection = self.rawCollection(collection_name); // 353
collection.insert(replaceTypes(document, replaceMeteorAtomWithMongo), // 354
{safe: true}, callback); // 355
} catch (e) { // 356
write.committed(); // 357
throw e; // 358
} // 359
}; // 360
// 361
// Cause queries that may be affected by the selector to poll in this write // 362
// fence. // 363
MongoConnection.prototype._refresh = function (collectionName, selector) { // 364
var self = this; // 365
var refreshKey = {collection: collectionName}; // 366
// If we know which documents we're removing, don't poll queries that are // 367
// specific to other documents. (Note that multiple notifications here should // 368
// not cause multiple polls, since all our listener is doing is enqueueing a // 369
// poll.) // 370
var specificIds = LocalCollection._idsMatchedBySelector(selector); // 371
if (specificIds) { // 372
_.each(specificIds, function (id) { // 373
Meteor.refresh(_.extend({id: id}, refreshKey)); // 374
}); // 375
} else { // 376
Meteor.refresh(refreshKey); // 377
} // 378
}; // 379
// 380
MongoConnection.prototype._remove = function (collection_name, selector, // 381
callback) { // 382
var self = this; // 383
// 384
if (collection_name === "___meteor_failure_test_collection") { // 385
var e = new Error("Failure test"); // 386
e.expected = true; // 387
if (callback) // 388
return callback(e); // 389
else // 390
throw e; // 391
} // 392
// 393
var write = self._maybeBeginWrite(); // 394
var refresh = function () { // 395
self._refresh(collection_name, selector); // 396
}; // 397
callback = bindEnvironmentForWrite(writeCallback(write, refresh, callback)); // 398
// 399
try { // 400
var collection = self.rawCollection(collection_name); // 401
collection.remove(replaceTypes(selector, replaceMeteorAtomWithMongo), // 402
{safe: true}, callback); // 403
} catch (e) { // 404
write.committed(); // 405
throw e; // 406
} // 407
}; // 408
// 409
MongoConnection.prototype._dropCollection = function (collectionName, cb) { // 410
var self = this; // 411
// 412
var write = self._maybeBeginWrite(); // 413
var refresh = function () { // 414
Meteor.refresh({collection: collectionName, id: null, // 415
dropCollection: true}); // 416
}; // 417
cb = bindEnvironmentForWrite(writeCallback(write, refresh, cb)); // 418
// 419
try { // 420
var collection = self.rawCollection(collectionName); // 421
collection.drop(cb); // 422
} catch (e) { // 423
write.committed(); // 424
throw e; // 425
} // 426
}; // 427
// 428
MongoConnection.prototype._update = function (collection_name, selector, mod, // 429
options, callback) { // 430
var self = this; // 431
// 432
if (! callback && options instanceof Function) { // 433
callback = options; // 434
options = null; // 435
} // 436
// 437
if (collection_name === "___meteor_failure_test_collection") { // 438
var e = new Error("Failure test"); // 439
e.expected = true; // 440
if (callback) // 441
return callback(e); // 442
else // 443
throw e; // 444
} // 445
// 446
// explicit safety check. null and undefined can crash the mongo // 447
// driver. Although the node driver and minimongo do 'support' // 448
// non-object modifier in that they don't crash, they are not // 449
// meaningful operations and do not do anything. Defensively throw an // 450
// error here. // 451
if (!mod || typeof mod !== 'object') // 452
throw new Error("Invalid modifier. Modifier must be an object."); // 453
// 454
if (!(LocalCollection._isPlainObject(mod) && // 455
!EJSON._isCustomType(mod))) { // 456
throw new Error( // 457
"Only plain objects may be used as replacement" + // 458
" documents in MongoDB"); // 459
return; // 460
} // 461
// 462
if (!options) options = {}; // 463
// 464
var write = self._maybeBeginWrite(); // 465
var refresh = function () { // 466
self._refresh(collection_name, selector); // 467
}; // 468
callback = writeCallback(write, refresh, callback); // 469
try { // 470
var collection = self.rawCollection(collection_name); // 471
var mongoOpts = {safe: true}; // 472
// explictly enumerate options that minimongo supports // 473
if (options.upsert) mongoOpts.upsert = true; // 474
if (options.multi) mongoOpts.multi = true; // 475
// Lets you get a more more full result from MongoDB. Use with caution: // 476
// might not work with C.upsert (as opposed to C.update({upsert:true}) or // 477
// with simulated upsert. // 478
if (options.fullResult) mongoOpts.fullResult = true; // 479
// 480
var mongoSelector = replaceTypes(selector, replaceMeteorAtomWithMongo); // 481
var mongoMod = replaceTypes(mod, replaceMeteorAtomWithMongo); // 482
// 483
var isModify = isModificationMod(mongoMod); // 484
var knownId = selector._id || mod._id; // 485
// 486
if (options._forbidReplace && ! isModify) { // 487
var e = new Error("Invalid modifier. Replacements are forbidden."); // 488
if (callback) { // 489
return callback(e); // 490
} else { // 491
throw e; // 492
} // 493
} // 494
// 495
if (options.upsert && (! knownId) && options.insertedId) { // 496
// XXX If we know we're using Mongo 2.6 (and this isn't a replacement) // 497
// we should be able to just use $setOnInsert instead of this // 498
// simulated upsert thing. (We can't use $setOnInsert with // 499
// replacements because there's nowhere to write it, and $setOnInsert // 500
// can't set _id on Mongo 2.4.) // 501
// // 502
// Also, in the future we could do a real upsert for the mongo id // 503
// generation case, if the the node mongo driver gives us back the id // 504
// of the upserted doc (which our current version does not). // 505
// // 506
// For more context, see // 507
// https://github.com/meteor/meteor/issues/2278#issuecomment-64252706 // 508
simulateUpsertWithInsertedId( // 509
collection, mongoSelector, mongoMod, // 510
isModify, options, // 511
// This callback does not need to be bindEnvironment'ed because // 512
// simulateUpsertWithInsertedId() wraps it and then passes it through // 513
// bindEnvironmentForWrite. // 514
function (err, result) { // 515
// If we got here via a upsert() call, then options._returnObject will // 516
// be set and we should return the whole object. Otherwise, we should // 517
// just return the number of affected docs to match the mongo API. // 518
if (result && ! options._returnObject) // 519
callback(err, result.numberAffected); // 520
else // 521
callback(err, result); // 522
} // 523
); // 524
} else { // 525
collection.update( // 526
mongoSelector, mongoMod, mongoOpts, // 527
bindEnvironmentForWrite(function (err, result, extra) { // 528
if (! err) { // 529
if (result && options._returnObject) { // 530
result = { numberAffected: result }; // 531
// If this was an upsert() call, and we ended up // 532
// inserting a new doc and we know its id, then // 533
// return that id as well. // 534
if (options.upsert && knownId && // 535
! extra.updatedExisting) // 536
result.insertedId = knownId; // 537
} // 538
} // 539
callback(err, result); // 540
})); // 541
} // 542
} catch (e) { // 543
write.committed(); // 544
throw e; // 545
} // 546
}; // 547
// 548
var isModificationMod = function (mod) { // 549
var isReplace = false; // 550
var isModify = false; // 551
for (var k in mod) { // 552
if (k.substr(0, 1) === '$') { // 553
isModify = true; // 554
} else { // 555
isReplace = true; // 556
} // 557
} // 558
if (isModify && isReplace) { // 559
throw new Error( // 560
"Update parameter cannot have both modifier and non-modifier fields."); // 561
} // 562
return isModify; // 563
}; // 564
// 565
var NUM_OPTIMISTIC_TRIES = 3; // 566
// 567
// exposed for testing // 568
MongoConnection._isCannotChangeIdError = function (err) { // 569
// First check for what this error looked like in Mongo 2.4. Either of these // 570
// checks should work, but just to be safe... // 571
if (err.code === 13596) // 572
return true; // 573
if (err.err.indexOf("cannot change _id of a document") === 0) // 574
return true; // 575
// 576
// Now look for what it looks like in Mongo 2.6. We don't use the error code // 577
// here, because the error code we observed it producing (16837) appears to be // 578
// a far more generic error code based on examining the source. // 579
if (err.err.indexOf("The _id field cannot be changed") === 0) // 580
return true; // 581
// 582
return false; // 583
}; // 584
// 585
var simulateUpsertWithInsertedId = function (collection, selector, mod, // 586
isModify, options, callback) { // 587
// STRATEGY: First try doing a plain update. If it affected 0 documents, // 588
// then without affecting the database, we know we should probably do an // 589
// insert. We then do a *conditional* insert that will fail in the case // 590
// of a race condition. This conditional insert is actually an // 591
// upsert-replace with an _id, which will never successfully update an // 592
// existing document. If this upsert fails with an error saying it // 593
// couldn't change an existing _id, then we know an intervening write has // 594
// caused the query to match something. We go back to step one and repeat. // 595
// Like all "optimistic write" schemes, we rely on the fact that it's // 596
// unlikely our writes will continue to be interfered with under normal // 597
// circumstances (though sufficiently heavy contention with writers // 598
// disagreeing on the existence of an object will cause writes to fail // 599
// in theory). // 600
// 601
var newDoc; // 602
// Run this code up front so that it fails fast if someone uses // 603
// a Mongo update operator we don't support. // 604
if (isModify) { // 605
// We've already run replaceTypes/replaceMeteorAtomWithMongo on // 606
// selector and mod. We assume it doesn't matter, as far as // 607
// the behavior of modifiers is concerned, whether `_modify` // 608
// is run on EJSON or on mongo-converted EJSON. // 609
var selectorDoc = LocalCollection._removeDollarOperators(selector); // 610
LocalCollection._modify(selectorDoc, mod, {isInsert: true}); // 611
newDoc = selectorDoc; // 612
} else { // 613
newDoc = mod; // 614
} // 615
// 616
var insertedId = options.insertedId; // must exist // 617
var mongoOptsForUpdate = { // 618
safe: true, // 619
multi: options.multi // 620
}; // 621
var mongoOptsForInsert = { // 622
safe: true, // 623
upsert: true // 624
}; // 625
// 626
var tries = NUM_OPTIMISTIC_TRIES; // 627
// 628
var doUpdate = function () { // 629
tries--; // 630
if (! tries) { // 631
callback(new Error("Upsert failed after " + NUM_OPTIMISTIC_TRIES + " tries.")); // 632
} else { // 633
collection.update(selector, mod, mongoOptsForUpdate, // 634
bindEnvironmentForWrite(function (err, result) { // 635
if (err) // 636
callback(err); // 637
else if (result) // 638
callback(null, { // 639
numberAffected: result // 640
}); // 641
else // 642
doConditionalInsert(); // 643
})); // 644
} // 645
}; // 646
// 647
var doConditionalInsert = function () { // 648
var replacementWithId = _.extend( // 649
replaceTypes({_id: insertedId}, replaceMeteorAtomWithMongo), // 650
newDoc); // 651
collection.update(selector, replacementWithId, mongoOptsForInsert, // 652
bindEnvironmentForWrite(function (err, result) { // 653
if (err) { // 654
// figure out if this is a // 655
// "cannot change _id of document" error, and // 656
// if so, try doUpdate() again, up to 3 times. // 657
if (MongoConnection._isCannotChangeIdError(err)) { // 658
doUpdate(); // 659
} else { // 660
callback(err); // 661
} // 662
} else { // 663
callback(null, { // 664
numberAffected: result, // 665
insertedId: insertedId // 666
}); // 667
} // 668
})); // 669
}; // 670
// 671
doUpdate(); // 672
}; // 673
// 674
_.each(["insert", "update", "remove", "dropCollection"], function (method) { // 675
MongoConnection.prototype[method] = function (/* arguments */) { // 676
var self = this; // 677
return Meteor.wrapAsync(self["_" + method]).apply(self, arguments); // 678
}; // 679
}); // 680
// 681
// XXX MongoConnection.upsert() does not return the id of the inserted document // 682
// unless you set it explicitly in the selector or modifier (as a replacement // 683
// doc). // 684
MongoConnection.prototype.upsert = function (collectionName, selector, mod, // 685
options, callback) { // 686
var self = this; // 687
if (typeof options === "function" && ! callback) { // 688
callback = options; // 689
options = {}; // 690
} // 691
// 692
return self.update(collectionName, selector, mod, // 693
_.extend({}, options, { // 694
upsert: true, // 695
_returnObject: true // 696
}), callback); // 697
}; // 698
// 699
MongoConnection.prototype.find = function (collectionName, selector, options) { // 700
var self = this; // 701
// 702
if (arguments.length === 1) // 703
selector = {}; // 704
// 705
return new Cursor( // 706
self, new CursorDescription(collectionName, selector, options)); // 707
}; // 708
// 709
MongoConnection.prototype.findOne = function (collection_name, selector, // 710
options) { // 711
var self = this; // 712
if (arguments.length === 1) // 713
selector = {}; // 714
// 715
options = options || {}; // 716
options.limit = 1; // 717
return self.find(collection_name, selector, options).fetch()[0]; // 718
}; // 719
// 720
// We'll actually design an index API later. For now, we just pass through to // 721
// Mongo's, but make it synchronous. // 722
MongoConnection.prototype._ensureIndex = function (collectionName, index, // 723
options) { // 724
var self = this; // 725
options = _.extend({safe: true}, options); // 726
// 727
// We expect this function to be called at startup, not from within a method, // 728
// so we don't interact with the write fence. // 729
var collection = self.rawCollection(collectionName); // 730
var future = new Future; // 731
var indexName = collection.ensureIndex(index, options, future.resolver()); // 732
future.wait(); // 733
}; // 734
MongoConnection.prototype._dropIndex = function (collectionName, index) { // 735
var self = this; // 736
// 737
// This function is only used by test code, not within a method, so we don't // 738
// interact with the write fence. // 739
var collection = self.rawCollection(collectionName); // 740
var future = new Future; // 741
var indexName = collection.dropIndex(index, future.resolver()); // 742
future.wait(); // 743
}; // 744
// 745
// CURSORS // 746
// 747
// There are several classes which relate to cursors: // 748
// // 749
// CursorDescription represents the arguments used to construct a cursor: // 750
// collectionName, selector, and (find) options. Because it is used as a key // 751
// for cursor de-dup, everything in it should either be JSON-stringifiable or // 752
// not affect observeChanges output (eg, options.transform functions are not // 753
// stringifiable but do not affect observeChanges). // 754
// // 755
// SynchronousCursor is a wrapper around a MongoDB cursor // 756
// which includes fully-synchronous versions of forEach, etc. // 757
// // 758
// Cursor is the cursor object returned from find(), which implements the // 759
// documented Mongo.Collection cursor API. It wraps a CursorDescription and a // 760
// SynchronousCursor (lazily: it doesn't contact Mongo until you call a method // 761
// like fetch or forEach on it). // 762
// // 763
// ObserveHandle is the "observe handle" returned from observeChanges. It has a // 764
// reference to an ObserveMultiplexer. // 765
// // 766
// ObserveMultiplexer allows multiple identical ObserveHandles to be driven by a // 767
// single observe driver. // 768
// // 769
// There are two "observe drivers" which drive ObserveMultiplexers: // 770
// - PollingObserveDriver caches the results of a query and reruns it when // 771
// necessary. // 772
// - OplogObserveDriver follows the Mongo operation log to directly observe // 773
// database changes. // 774
// Both implementations follow the same simple interface: when you create them, // 775
// they start sending observeChanges callbacks (and a ready() invocation) to // 776
// their ObserveMultiplexer, and you stop them by calling their stop() method. // 777
// 778
CursorDescription = function (collectionName, selector, options) { // 779
var self = this; // 780
self.collectionName = collectionName; // 781
self.selector = Mongo.Collection._rewriteSelector(selector); // 782
self.options = options || {}; // 783
}; // 784
// 785
Cursor = function (mongo, cursorDescription) { // 786
var self = this; // 787
// 788
self._mongo = mongo; // 789
self._cursorDescription = cursorDescription; // 790
self._synchronousCursor = null; // 791
}; // 792
// 793
_.each(['forEach', 'map', 'fetch', 'count'], function (method) { // 794
Cursor.prototype[method] = function () { // 795
var self = this; // 796
// 797
// You can only observe a tailable cursor. // 798
if (self._cursorDescription.options.tailable) // 799
throw new Error("Cannot call " + method + " on a tailable cursor"); // 800
// 801
if (!self._synchronousCursor) { // 802
self._synchronousCursor = self._mongo._createSynchronousCursor( // 803
self._cursorDescription, { // 804
// Make sure that the "self" argument to forEach/map callbacks is the // 805
// Cursor, not the SynchronousCursor. // 806
selfForIteration: self, // 807
useTransform: true // 808
}); // 809
} // 810
// 811
return self._synchronousCursor[method].apply( // 812
self._synchronousCursor, arguments); // 813
}; // 814
}); // 815
// 816
// Since we don't actually have a "nextObject" interface, there's really no // 817
// reason to have a "rewind" interface. All it did was make multiple calls // 818
// to fetch/map/forEach return nothing the second time. // 819
// XXX COMPAT WITH 0.8.1 // 820
Cursor.prototype.rewind = function () { // 821
}; // 822
// 823
Cursor.prototype.getTransform = function () { // 824
return this._cursorDescription.options.transform; // 825
}; // 826
// 827
// When you call Meteor.publish() with a function that returns a Cursor, we need // 828
// to transmute it into the equivalent subscription. This is the function that // 829
// does that. // 830
// 831
Cursor.prototype._publishCursor = function (sub) { // 832
var self = this; // 833
var collection = self._cursorDescription.collectionName; // 834
return Mongo.Collection._publishCursor(self, sub, collection); // 835
}; // 836
// 837
// Used to guarantee that publish functions return at most one cursor per // 838
// collection. Private, because we might later have cursors that include // 839
// documents from multiple collections somehow. // 840
Cursor.prototype._getCollectionName = function () { // 841
var self = this; // 842
return self._cursorDescription.collectionName; // 843
} // 844
// 845
Cursor.prototype.observe = function (callbacks) { // 846
var self = this; // 847
return LocalCollection._observeFromObserveChanges(self, callbacks); // 848
}; // 849
// 850
Cursor.prototype.observeChanges = function (callbacks) { // 851
var self = this; // 852
var ordered = LocalCollection._observeChangesCallbacksAreOrdered(callbacks); // 853
return self._mongo._observeChanges( // 854
self._cursorDescription, ordered, callbacks); // 855
}; // 856
// 857
MongoConnection.prototype._createSynchronousCursor = function( // 858
cursorDescription, options) { // 859
var self = this; // 860
options = _.pick(options || {}, 'selfForIteration', 'useTransform'); // 861
// 862
var collection = self.rawCollection(cursorDescription.collectionName); // 863
var cursorOptions = cursorDescription.options; // 864
var mongoOptions = { // 865
sort: cursorOptions.sort, // 866
limit: cursorOptions.limit, // 867
skip: cursorOptions.skip // 868
}; // 869
// 870
// Do we want a tailable cursor (which only works on capped collections)? // 871
if (cursorOptions.tailable) { // 872
// We want a tailable cursor... // 873
mongoOptions.tailable = true; // 874
// ... and for the server to wait a bit if any getMore has no data (rather // 875
// than making us put the relevant sleeps in the client)... // 876
mongoOptions.awaitdata = true; // 877
// ... and to keep querying the server indefinitely rather than just 5 times // 878
// if there's no more data. // 879
mongoOptions.numberOfRetries = -1; // 880
// And if this is on the oplog collection and the cursor specifies a 'ts', // 881
// then set the undocumented oplog replay flag, which does a special scan to // 882
// find the first document (instead of creating an index on ts). This is a // 883
// very hard-coded Mongo flag which only works on the oplog collection and // 884
// only works with the ts field. // 885
if (cursorDescription.collectionName === OPLOG_COLLECTION && // 886
cursorDescription.selector.ts) { // 887
mongoOptions.oplogReplay = true; // 888
} // 889
} // 890
// 891
var dbCursor = collection.find( // 892
replaceTypes(cursorDescription.selector, replaceMeteorAtomWithMongo), // 893
cursorOptions.fields, mongoOptions); // 894
// 895
return new SynchronousCursor(dbCursor, cursorDescription, options); // 896
}; // 897
// 898
var SynchronousCursor = function (dbCursor, cursorDescription, options) { // 899
var self = this; // 900
options = _.pick(options || {}, 'selfForIteration', 'useTransform'); // 901
// 902
self._dbCursor = dbCursor; // 903
self._cursorDescription = cursorDescription; // 904
// The "self" argument passed to forEach/map callbacks. If we're wrapped // 905
// inside a user-visible Cursor, we want to provide the outer cursor! // 906
self._selfForIteration = options.selfForIteration || self; // 907
if (options.useTransform && cursorDescription.options.transform) { // 908
self._transform = LocalCollection.wrapTransform( // 909
cursorDescription.options.transform); // 910
} else { // 911
self._transform = null; // 912
} // 913
// 914
// Need to specify that the callback is the first argument to nextObject, // 915
// since otherwise when we try to call it with no args the driver will // 916
// interpret "undefined" first arg as an options hash and crash. // 917
self._synchronousNextObject = Future.wrap( // 918
dbCursor.nextObject.bind(dbCursor), 0); // 919
self._synchronousCount = Future.wrap(dbCursor.count.bind(dbCursor)); // 920
self._visitedIds = new LocalCollection._IdMap; // 921
}; // 922
// 923
_.extend(SynchronousCursor.prototype, { // 924
_nextObject: function () { // 925
var self = this; // 926
// 927
while (true) { // 928
var doc = self._synchronousNextObject().wait(); // 929
// 930
if (!doc) return null; // 931
doc = replaceTypes(doc, replaceMongoAtomWithMeteor); // 932
// 933
if (!self._cursorDescription.options.tailable && _.has(doc, '_id')) { // 934
// Did Mongo give us duplicate documents in the same cursor? If so, // 935
// ignore this one. (Do this before the transform, since transform might // 936
// return some unrelated value.) We don't do this for tailable cursors, // 937
// because we want to maintain O(1) memory usage. And if there isn't _id // 938
// for some reason (maybe it's the oplog), then we don't do this either. // 939
// (Be careful to do this for falsey but existing _id, though.) // 940
if (self._visitedIds.has(doc._id)) continue; // 941
self._visitedIds.set(doc._id, true); // 942
} // 943
// 944
if (self._transform) // 945
doc = self._transform(doc); // 946
// 947
return doc; // 948
} // 949
}, // 950
// 951
forEach: function (callback, thisArg) { // 952
var self = this; // 953
// 954
// Get back to the beginning. // 955
self._rewind(); // 956
// 957
// We implement the loop ourself instead of using self._dbCursor.each, // 958
// because "each" will call its callback outside of a fiber which makes it // 959
// much more complex to make this function synchronous. // 960
var index = 0; // 961
while (true) { // 962
var doc = self._nextObject(); // 963
if (!doc) return; // 964
callback.call(thisArg, doc, index++, self._selfForIteration); // 965
} // 966
}, // 967
// 968
// XXX Allow overlapping callback executions if callback yields. // 969
map: function (callback, thisArg) { // 970
var self = this; // 971
var res = []; // 972
self.forEach(function (doc, index) { // 973
res.push(callback.call(thisArg, doc, index, self._selfForIteration)); // 974
}); // 975
return res; // 976
}, // 977
// 978
_rewind: function () { // 979
var self = this; // 980
// 981
// known to be synchronous // 982
self._dbCursor.rewind(); // 983
// 984
self._visitedIds = new LocalCollection._IdMap; // 985
}, // 986
// 987
// Mostly usable for tailable cursors. // 988
close: function () { // 989
var self = this; // 990
// 991
self._dbCursor.close(); // 992
}, // 993
// 994
fetch: function () { // 995
var self = this; // 996
return self.map(_.identity); // 997
}, // 998
// 999
count: function () { // 1000
var self = this; // 1001
return self._synchronousCount().wait(); // 1002
}, // 1003
// 1004
// This method is NOT wrapped in Cursor. // 1005
getRawObjects: function (ordered) { // 1006
var self = this; // 1007
if (ordered) { // 1008
return self.fetch(); // 1009
} else { // 1010
var results = new LocalCollection._IdMap; // 1011
self.forEach(function (doc) { // 1012
results.set(doc._id, doc); // 1013
}); // 1014
return results; // 1015
} // 1016
} // 1017
}); // 1018
// 1019
MongoConnection.prototype.tail = function (cursorDescription, docCallback) { // 1020
var self = this; // 1021
if (!cursorDescription.options.tailable) // 1022
throw new Error("Can only tail a tailable cursor"); // 1023
// 1024
var cursor = self._createSynchronousCursor(cursorDescription); // 1025
// 1026
var stopped = false; // 1027
var lastTS = undefined; // 1028
var loop = function () { // 1029
while (true) { // 1030
if (stopped) // 1031
return; // 1032
try { // 1033
var doc = cursor._nextObject(); // 1034
} catch (err) { // 1035
// There's no good way to figure out if this was actually an error // 1036
// from Mongo. Ah well. But either way, we need to retry the cursor // 1037
// (unless the failure was because the observe got stopped). // 1038
doc = null; // 1039
} // 1040
// Since cursor._nextObject can yield, we need to check again to see if // 1041
// we've been stopped before calling the callback. // 1042
if (stopped) // 1043
return; // 1044
if (doc) { // 1045
// If a tailable cursor contains a "ts" field, use it to recreate the // 1046
// cursor on error. ("ts" is a standard that Mongo uses internally for // 1047
// the oplog, and there's a special flag that lets you do binary search // 1048
// on it instead of needing to use an index.) // 1049
lastTS = doc.ts; // 1050
docCallback(doc); // 1051
} else { // 1052
var newSelector = _.clone(cursorDescription.selector); // 1053
if (lastTS) { // 1054
newSelector.ts = {$gt: lastTS}; // 1055
} // 1056
cursor = self._createSynchronousCursor(new CursorDescription( // 1057
cursorDescription.collectionName, // 1058
newSelector, // 1059
cursorDescription.options)); // 1060
// Mongo failover takes many seconds. Retry in a bit. (Without this // 1061
// setTimeout, we peg the CPU at 100% and never notice the actual // 1062
// failover. // 1063
Meteor.setTimeout(loop, 100); // 1064
break; // 1065
} // 1066
} // 1067
}; // 1068
// 1069
Meteor.defer(loop); // 1070
// 1071
return { // 1072
stop: function () { // 1073
stopped = true; // 1074
cursor.close(); // 1075
} // 1076
}; // 1077
}; // 1078
// 1079
MongoConnection.prototype._observeChanges = function ( // 1080
cursorDescription, ordered, callbacks) { // 1081
var self = this; // 1082
// 1083
if (cursorDescription.options.tailable) { // 1084
return self._observeChangesTailable(cursorDescription, ordered, callbacks); // 1085
} // 1086
// 1087
// You may not filter out _id when observing changes, because the id is a core // 1088
// part of the observeChanges API. // 1089
if (cursorDescription.options.fields && // 1090
(cursorDescription.options.fields._id === 0 || // 1091
cursorDescription.options.fields._id === false)) { // 1092
throw Error("You may not observe a cursor with {fields: {_id: 0}}"); // 1093
} // 1094
// 1095
var observeKey = JSON.stringify( // 1096
_.extend({ordered: ordered}, cursorDescription)); // 1097
// 1098
var multiplexer, observeDriver; // 1099
var firstHandle = false; // 1100
// 1101
// Find a matching ObserveMultiplexer, or create a new one. This next block is // 1102
// guaranteed to not yield (and it doesn't call anything that can observe a // 1103
// new query), so no other calls to this function can interleave with it. // 1104
Meteor._noYieldsAllowed(function () { // 1105
if (_.has(self._observeMultiplexers, observeKey)) { // 1106
multiplexer = self._observeMultiplexers[observeKey]; // 1107
} else { // 1108
firstHandle = true; // 1109
// Create a new ObserveMultiplexer. // 1110
multiplexer = new ObserveMultiplexer({ // 1111
ordered: ordered, // 1112
onStop: function () { // 1113
delete self._observeMultiplexers[observeKey]; // 1114
observeDriver.stop(); // 1115
} // 1116
}); // 1117
self._observeMultiplexers[observeKey] = multiplexer; // 1118
} // 1119
}); // 1120
// 1121
var observeHandle = new ObserveHandle(multiplexer, callbacks); // 1122
// 1123
if (firstHandle) { // 1124
var matcher, sorter; // 1125
var canUseOplog = _.all([ // 1126
function () { // 1127
// At a bare minimum, using the oplog requires us to have an oplog, to // 1128
// want unordered callbacks, and to not want a callback on the polls // 1129
// that won't happen. // 1130
return self._oplogHandle && !ordered && // 1131
!callbacks._testOnlyPollCallback; // 1132
}, function () { // 1133
// We need to be able to compile the selector. Fall back to polling for // 1134
// some newfangled $selector that minimongo doesn't support yet. // 1135
try { // 1136
matcher = new Minimongo.Matcher(cursorDescription.selector); // 1137
return true; // 1138
} catch (e) { // 1139
// XXX make all compilation errors MinimongoError or something // 1140
// so that this doesn't ignore unrelated exceptions // 1141
return false; // 1142
} // 1143
}, function () { // 1144
// ... and the selector itself needs to support oplog. // 1145
return OplogObserveDriver.cursorSupported(cursorDescription, matcher); // 1146
}, function () { // 1147
// And we need to be able to compile the sort, if any. eg, can't be // 1148
// {$natural: 1}. // 1149
if (!cursorDescription.options.sort) // 1150
return true; // 1151
try { // 1152
sorter = new Minimongo.Sorter(cursorDescription.options.sort, // 1153
{ matcher: matcher }); // 1154
return true; // 1155
} catch (e) { // 1156
// XXX make all compilation errors MinimongoError or something // 1157
// so that this doesn't ignore unrelated exceptions // 1158
return false; // 1159
} // 1160
}], function (f) { return f(); }); // invoke each function // 1161
// 1162
var driverClass = canUseOplog ? OplogObserveDriver : PollingObserveDriver; // 1163
observeDriver = new driverClass({ // 1164
cursorDescription: cursorDescription, // 1165
mongoHandle: self, // 1166
multiplexer: multiplexer, // 1167
ordered: ordered, // 1168
matcher: matcher, // ignored by polling // 1169
sorter: sorter, // ignored by polling // 1170
_testOnlyPollCallback: callbacks._testOnlyPollCallback // 1171
}); // 1172
// 1173
// This field is only set for use in tests. // 1174
multiplexer._observeDriver = observeDriver; // 1175
} // 1176
// 1177
// Blocks until the initial adds have been sent. // 1178
multiplexer.addHandleAndSendInitialAdds(observeHandle); // 1179
// 1180
return observeHandle; // 1181
}; // 1182
// 1183
// Listen for the invalidation messages that will trigger us to poll the // 1184
// database for changes. If this selector specifies specific IDs, specify them // 1185
// here, so that updates to different specific IDs don't cause us to poll. // 1186
// listenCallback is the same kind of (notification, complete) callback passed // 1187
// to InvalidationCrossbar.listen. // 1188
// 1189
listenAll = function (cursorDescription, listenCallback) { // 1190
var listeners = []; // 1191
forEachTrigger(cursorDescription, function (trigger) { // 1192
listeners.push(DDPServer._InvalidationCrossbar.listen( // 1193
trigger, listenCallback)); // 1194
}); // 1195
// 1196
return { // 1197
stop: function () { // 1198
_.each(listeners, function (listener) { // 1199
listener.stop(); // 1200
}); // 1201
} // 1202
}; // 1203
}; // 1204
// 1205
forEachTrigger = function (cursorDescription, triggerCallback) { // 1206
var key = {collection: cursorDescription.collectionName}; // 1207
var specificIds = LocalCollection._idsMatchedBySelector( // 1208
cursorDescription.selector); // 1209
if (specificIds) { // 1210
_.each(specificIds, function (id) { // 1211
triggerCallback(_.extend({id: id}, key)); // 1212
}); // 1213
triggerCallback(_.extend({dropCollection: true, id: null}, key)); // 1214
} else { // 1215
triggerCallback(key); // 1216
} // 1217
}; // 1218
// 1219
// observeChanges for tailable cursors on capped collections. // 1220
// // 1221
// Some differences from normal cursors: // 1222
// - Will never produce anything other than 'added' or 'addedBefore'. If you // 1223
// do update a document that has already been produced, this will not notice // 1224
// it. // 1225
// - If you disconnect and reconnect from Mongo, it will essentially restart // 1226
// the query, which will lead to duplicate results. This is pretty bad, // 1227
// but if you include a field called 'ts' which is inserted as // 1228
// new MongoInternals.MongoTimestamp(0, 0) (which is initialized to the // 1229
// current Mongo-style timestamp), we'll be able to find the place to // 1230
// restart properly. (This field is specifically understood by Mongo with an // 1231
// optimization which allows it to find the right place to start without // 1232
// an index on ts. It's how the oplog works.) // 1233
// - No callbacks are triggered synchronously with the call (there's no // 1234
// differentiation between "initial data" and "later changes"; everything // 1235
// that matches the query gets sent asynchronously). // 1236
// - De-duplication is not implemented. // 1237
// - Does not yet interact with the write fence. Probably, this should work by // 1238
// ignoring removes (which don't work on capped collections) and updates // 1239
// (which don't affect tailable cursors), and just keeping track of the ID // 1240
// of the inserted object, and closing the write fence once you get to that // 1241
// ID (or timestamp?). This doesn't work well if the document doesn't match // 1242
// the query, though. On the other hand, the write fence can close // 1243
// immediately if it does not match the query. So if we trust minimongo // 1244
// enough to accurately evaluate the query against the write fence, we // 1245
// should be able to do this... Of course, minimongo doesn't even support // 1246
// Mongo Timestamps yet. // 1247
MongoConnection.prototype._observeChangesTailable = function ( // 1248
cursorDescription, ordered, callbacks) { // 1249
var self = this; // 1250
// 1251
// Tailable cursors only ever call added/addedBefore callbacks, so it's an // 1252
// error if you didn't provide them. // 1253
if ((ordered && !callbacks.addedBefore) || // 1254
(!ordered && !callbacks.added)) { // 1255
throw new Error("Can't observe an " + (ordered ? "ordered" : "unordered") // 1256
+ " tailable cursor without a " // 1257
+ (ordered ? "addedBefore" : "added") + " callback"); // 1258
} // 1259
// 1260
return self.tail(cursorDescription, function (doc) { // 1261
var id = doc._id; // 1262
delete doc._id; // 1263
// The ts is an implementation detail. Hide it. // 1264
delete doc.ts; // 1265
if (ordered) { // 1266
callbacks.addedBefore(id, doc, null); // 1267
} else { // 1268
callbacks.added(id, doc); // 1269
} // 1270
}); // 1271
}; // 1272
// 1273
// XXX We probably need to find a better way to expose this. Right now // 1274
// it's only used by tests, but in fact you need it in normal // 1275
// operation to interact with capped collections. // 1276
MongoInternals.MongoTimestamp = MongoDB.Timestamp; // 1277
// 1278
MongoInternals.Connection = MongoConnection; // 1279
// 1280
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/oplog_tailing.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
var Future = Npm.require('fibers/future'); // 1
// 2
OPLOG_COLLECTION = 'oplog.rs'; // 3
// 4
var TOO_FAR_BEHIND = process.env.METEOR_OPLOG_TOO_FAR_BEHIND || 2000; // 5
// 6
// Like Perl's quotemeta: quotes all regexp metacharacters. See // 7
// https://github.com/substack/quotemeta/blob/master/index.js // 8
// XXX this is duplicated with accounts_server.js // 9
var quotemeta = function (str) { // 10
return String(str).replace(/(\W)/g, '\\$1'); // 11
}; // 12
// 13
var showTS = function (ts) { // 14
return "Timestamp(" + ts.getHighBits() + ", " + ts.getLowBits() + ")"; // 15
}; // 16
// 17
idForOp = function (op) { // 18
if (op.op === 'd') // 19
return op.o._id; // 20
else if (op.op === 'i') // 21
return op.o._id; // 22
else if (op.op === 'u') // 23
return op.o2._id; // 24
else if (op.op === 'c') // 25
throw Error("Operator 'c' doesn't supply an object with id: " + // 26
EJSON.stringify(op)); // 27
else // 28
throw Error("Unknown op: " + EJSON.stringify(op)); // 29
}; // 30
// 31
OplogHandle = function (oplogUrl, dbName) { // 32
var self = this; // 33
self._oplogUrl = oplogUrl; // 34
self._dbName = dbName; // 35
// 36
self._oplogLastEntryConnection = null; // 37
self._oplogTailConnection = null; // 38
self._stopped = false; // 39
self._tailHandle = null; // 40
self._readyFuture = new Future(); // 41
self._crossbar = new DDPServer._Crossbar({ // 42
factPackage: "mongo-livedata", factName: "oplog-watchers" // 43
}); // 44
self._baseOplogSelector = { // 45
ns: new RegExp('^' + quotemeta(self._dbName) + '\\.'), // 46
$or: [ // 47
{ op: {$in: ['i', 'u', 'd']} }, // 48
// If it is not db.collection.drop(), ignore it // 49
{ op: 'c', 'o.drop': { $exists: true } }] // 50
}; // 51
// 52
// Data structures to support waitUntilCaughtUp(). Each oplog entry has a // 53
// MongoTimestamp object on it (which is not the same as a Date --- it's a // 54
// combination of time and an incrementing counter; see // 55
// http://docs.mongodb.org/manual/reference/bson-types/#timestamps). // 56
// // 57
// _catchingUpFutures is an array of {ts: MongoTimestamp, future: Future} // 58
// objects, sorted by ascending timestamp. _lastProcessedTS is the // 59
// MongoTimestamp of the last oplog entry we've processed. // 60
// // 61
// Each time we call waitUntilCaughtUp, we take a peek at the final oplog // 62
// entry in the db. If we've already processed it (ie, it is not greater than // 63
// _lastProcessedTS), waitUntilCaughtUp immediately returns. Otherwise, // 64
// waitUntilCaughtUp makes a new Future and inserts it along with the final // 65
// timestamp entry that it read, into _catchingUpFutures. waitUntilCaughtUp // 66
// then waits on that future, which is resolved once _lastProcessedTS is // 67
// incremented to be past its timestamp by the worker fiber. // 68
// // 69
// XXX use a priority queue or something else that's faster than an array // 70
self._catchingUpFutures = []; // 71
self._lastProcessedTS = null; // 72
// 73
self._onSkippedEntriesHook = new Hook({ // 74
debugPrintExceptions: "onSkippedEntries callback" // 75
}); // 76
// 77
self._entryQueue = new Meteor._DoubleEndedQueue(); // 78
self._workerActive = false; // 79
// 80
self._startTailing(); // 81
}; // 82
// 83
_.extend(OplogHandle.prototype, { // 84
stop: function () { // 85
var self = this; // 86
if (self._stopped) // 87
return; // 88
self._stopped = true; // 89
if (self._tailHandle) // 90
self._tailHandle.stop(); // 91
// XXX should close connections too // 92
}, // 93
onOplogEntry: function (trigger, callback) { // 94
var self = this; // 95
if (self._stopped) // 96
throw new Error("Called onOplogEntry on stopped handle!"); // 97
// 98
// Calling onOplogEntry requires us to wait for the tailing to be ready. // 99
self._readyFuture.wait(); // 100
// 101
var originalCallback = callback; // 102
callback = Meteor.bindEnvironment(function (notification) { // 103
// XXX can we avoid this clone by making oplog.js careful? // 104
originalCallback(EJSON.clone(notification)); // 105
}, function (err) { // 106
Meteor._debug("Error in oplog callback", err.stack); // 107
}); // 108
var listenHandle = self._crossbar.listen(trigger, callback); // 109
return { // 110
stop: function () { // 111
listenHandle.stop(); // 112
} // 113
}; // 114
}, // 115
// Register a callback to be invoked any time we skip oplog entries (eg, // 116
// because we are too far behind). // 117
onSkippedEntries: function (callback) { // 118
var self = this; // 119
if (self._stopped) // 120
throw new Error("Called onSkippedEntries on stopped handle!"); // 121
return self._onSkippedEntriesHook.register(callback); // 122
}, // 123
// Calls `callback` once the oplog has been processed up to a point that is // 124
// roughly "now": specifically, once we've processed all ops that are // 125
// currently visible. // 126
// XXX become convinced that this is actually safe even if oplogConnection // 127
// is some kind of pool // 128
waitUntilCaughtUp: function () { // 129
var self = this; // 130
if (self._stopped) // 131
throw new Error("Called waitUntilCaughtUp on stopped handle!"); // 132
// 133
// Calling waitUntilCaughtUp requries us to wait for the oplog connection to // 134
// be ready. // 135
self._readyFuture.wait(); // 136
// 137
while (!self._stopped) { // 138
// We need to make the selector at least as restrictive as the actual // 139
// tailing selector (ie, we need to specify the DB name) or else we might // 140
// find a TS that won't show up in the actual tail stream. // 141
try { // 142
var lastEntry = self._oplogLastEntryConnection.findOne( // 143
OPLOG_COLLECTION, self._baseOplogSelector, // 144
{fields: {ts: 1}, sort: {$natural: -1}}); // 145
break; // 146
} catch (e) { // 147
// During failover (eg) if we get an exception we should log and retry // 148
// instead of crashing. // 149
Meteor._debug("Got exception while reading last entry: " + e); // 150
Meteor._sleepForMs(100); // 151
} // 152
} // 153
// 154
if (self._stopped) // 155
return; // 156
// 157
if (!lastEntry) { // 158
// Really, nothing in the oplog? Well, we've processed everything. // 159
return; // 160
} // 161
// 162
var ts = lastEntry.ts; // 163
if (!ts) // 164
throw Error("oplog entry without ts: " + EJSON.stringify(lastEntry)); // 165
// 166
if (self._lastProcessedTS && ts.lessThanOrEqual(self._lastProcessedTS)) { // 167
// We've already caught up to here. // 168
return; // 169
} // 170
// 171
// 172
// Insert the future into our list. Almost always, this will be at the end, // 173
// but it's conceivable that if we fail over from one primary to another, // 174
// the oplog entries we see will go backwards. // 175
var insertAfter = self._catchingUpFutures.length; // 176
while (insertAfter - 1 > 0 // 177
&& self._catchingUpFutures[insertAfter - 1].ts.greaterThan(ts)) { // 178
insertAfter--; // 179
} // 180
var f = new Future; // 181
self._catchingUpFutures.splice(insertAfter, 0, {ts: ts, future: f}); // 182
f.wait(); // 183
}, // 184
_startTailing: function () { // 185
var self = this; // 186
// First, make sure that we're talking to the local database. // 187
var mongodbUri = Npm.require('mongodb-uri'); // 188
if (mongodbUri.parse(self._oplogUrl).database !== 'local') { // 189
throw Error("$MONGO_OPLOG_URL must be set to the 'local' database of " + // 190
"a Mongo replica set"); // 191
} // 192
// 193
// We make two separate connections to Mongo. The Node Mongo driver // 194
// implements a naive round-robin connection pool: each "connection" is a // 195
// pool of several (5 by default) TCP connections, and each request is // 196
// rotated through the pools. Tailable cursor queries block on the server // 197
// until there is some data to return (or until a few seconds have // 198
// passed). So if the connection pool used for tailing cursors is the same // 199
// pool used for other queries, the other queries will be delayed by seconds // 200
// 1/5 of the time. // 201
// // 202
// The tail connection will only ever be running a single tail command, so // 203
// it only needs to make one underlying TCP connection. // 204
self._oplogTailConnection = new MongoConnection( // 205
self._oplogUrl, {poolSize: 1}); // 206
// XXX better docs, but: it's to get monotonic results // 207
// XXX is it safe to say "if there's an in flight query, just use its // 208
// results"? I don't think so but should consider that // 209
self._oplogLastEntryConnection = new MongoConnection( // 210
self._oplogUrl, {poolSize: 1}); // 211
// 212
// Now, make sure that there actually is a repl set here. If not, oplog // 213
// tailing won't ever find anything! // 214
var f = new Future; // 215
self._oplogLastEntryConnection.db.admin().command( // 216
{ ismaster: 1 }, f.resolver()); // 217
var isMasterDoc = f.wait(); // 218
if (!(isMasterDoc && isMasterDoc.documents && isMasterDoc.documents[0] && // 219
isMasterDoc.documents[0].setName)) { // 220
throw Error("$MONGO_OPLOG_URL must be set to the 'local' database of " + // 221
"a Mongo replica set"); // 222
} // 223
// 224
// Find the last oplog entry. // 225
var lastOplogEntry = self._oplogLastEntryConnection.findOne( // 226
OPLOG_COLLECTION, {}, {sort: {$natural: -1}, fields: {ts: 1}}); // 227
// 228
var oplogSelector = _.clone(self._baseOplogSelector); // 229
if (lastOplogEntry) { // 230
// Start after the last entry that currently exists. // 231
oplogSelector.ts = {$gt: lastOplogEntry.ts}; // 232
// If there are any calls to callWhenProcessedLatest before any other // 233
// oplog entries show up, allow callWhenProcessedLatest to call its // 234
// callback immediately. // 235
self._lastProcessedTS = lastOplogEntry.ts; // 236
} // 237
// 238
var cursorDescription = new CursorDescription( // 239
OPLOG_COLLECTION, oplogSelector, {tailable: true}); // 240
// 241
self._tailHandle = self._oplogTailConnection.tail( // 242
cursorDescription, function (doc) { // 243
self._entryQueue.push(doc); // 244
self._maybeStartWorker(); // 245
} // 246
); // 247
self._readyFuture.return(); // 248
}, // 249
// 250
_maybeStartWorker: function () { // 251
var self = this; // 252
if (self._workerActive) // 253
return; // 254
self._workerActive = true; // 255
Meteor.defer(function () { // 256
try { // 257
while (! self._stopped && ! self._entryQueue.isEmpty()) { // 258
// Are we too far behind? Just tell our observers that they need to // 259
// repoll, and drop our queue. // 260
if (self._entryQueue.length > TOO_FAR_BEHIND) { // 261
var lastEntry = self._entryQueue.pop(); // 262
self._entryQueue.clear(); // 263
// 264
self._onSkippedEntriesHook.each(function (callback) { // 265
callback(); // 266
return true; // 267
}); // 268
// 269
// Free any waitUntilCaughtUp() calls that were waiting for us to // 270
// pass something that we just skipped. // 271
self._setLastProcessedTS(lastEntry.ts); // 272
continue; // 273
} // 274
// 275
var doc = self._entryQueue.shift(); // 276
// 277
if (!(doc.ns && doc.ns.length > self._dbName.length + 1 && // 278
doc.ns.substr(0, self._dbName.length + 1) === // 279
(self._dbName + '.'))) { // 280
throw new Error("Unexpected ns"); // 281
} // 282
// 283
var trigger = {collection: doc.ns.substr(self._dbName.length + 1), // 284
dropCollection: false, // 285
op: doc}; // 286
// 287
// Is it a special command and the collection name is hidden somewhere // 288
// in operator? // 289
if (trigger.collection === "$cmd") { // 290
trigger.collection = doc.o.drop; // 291
trigger.dropCollection = true; // 292
trigger.id = null; // 293
} else { // 294
// All other ops have an id. // 295
trigger.id = idForOp(doc); // 296
} // 297
// 298
self._crossbar.fire(trigger); // 299
// 300
// Now that we've processed this operation, process pending // 301
// sequencers. // 302
if (!doc.ts) // 303
throw Error("oplog entry without ts: " + EJSON.stringify(doc)); // 304
self._setLastProcessedTS(doc.ts); // 305
} // 306
} finally { // 307
self._workerActive = false; // 308
} // 309
}); // 310
}, // 311
_setLastProcessedTS: function (ts) { // 312
var self = this; // 313
self._lastProcessedTS = ts; // 314
while (!_.isEmpty(self._catchingUpFutures) // 315
&& self._catchingUpFutures[0].ts.lessThanOrEqual( // 316
self._lastProcessedTS)) { // 317
var sequencer = self._catchingUpFutures.shift(); // 318
sequencer.future.return(); // 319
} // 320
} // 321
}); // 322
// 323
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/observe_multiplex.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
var Future = Npm.require('fibers/future'); // 1
// 2
ObserveMultiplexer = function (options) { // 3
var self = this; // 4
// 5
if (!options || !_.has(options, 'ordered')) // 6
throw Error("must specified ordered"); // 7
// 8
Package.facts && Package.facts.Facts.incrementServerFact( // 9
"mongo-livedata", "observe-multiplexers", 1); // 10
// 11
self._ordered = options.ordered; // 12
self._onStop = options.onStop || function () {}; // 13
self._queue = new Meteor._SynchronousQueue(); // 14
self._handles = {}; // 15
self._readyFuture = new Future; // 16
self._cache = new LocalCollection._CachingChangeObserver({ // 17
ordered: options.ordered}); // 18
// Number of addHandleAndSendInitialAdds tasks scheduled but not yet // 19
// running. removeHandle uses this to know if it's time to call the onStop // 20
// callback. // 21
self._addHandleTasksScheduledButNotPerformed = 0; // 22
// 23
_.each(self.callbackNames(), function (callbackName) { // 24
self[callbackName] = function (/* ... */) { // 25
self._applyCallback(callbackName, _.toArray(arguments)); // 26
}; // 27
}); // 28
}; // 29
// 30
_.extend(ObserveMultiplexer.prototype, { // 31
addHandleAndSendInitialAdds: function (handle) { // 32
var self = this; // 33
// 34
// Check this before calling runTask (even though runTask does the same // 35
// check) so that we don't leak an ObserveMultiplexer on error by // 36
// incrementing _addHandleTasksScheduledButNotPerformed and never // 37
// decrementing it. // 38
if (!self._queue.safeToRunTask()) // 39
throw new Error( // 40
"Can't call observeChanges from an observe callback on the same query"); // 41
++self._addHandleTasksScheduledButNotPerformed; // 42
// 43
Package.facts && Package.facts.Facts.incrementServerFact( // 44
"mongo-livedata", "observe-handles", 1); // 45
// 46
self._queue.runTask(function () { // 47
self._handles[handle._id] = handle; // 48
// Send out whatever adds we have so far (whether or not we the // 49
// multiplexer is ready). // 50
self._sendAdds(handle); // 51
--self._addHandleTasksScheduledButNotPerformed; // 52
}); // 53
// *outside* the task, since otherwise we'd deadlock // 54
self._readyFuture.wait(); // 55
}, // 56
// 57
// Remove an observe handle. If it was the last observe handle, call the // 58
// onStop callback; you cannot add any more observe handles after this. // 59
// // 60
// This is not synchronized with polls and handle additions: this means that // 61
// you can safely call it from within an observe callback, but it also means // 62
// that we have to be careful when we iterate over _handles. // 63
removeHandle: function (id) { // 64
var self = this; // 65
// 66
// This should not be possible: you can only call removeHandle by having // 67
// access to the ObserveHandle, which isn't returned to user code until the // 68
// multiplex is ready. // 69
if (!self._ready()) // 70
throw new Error("Can't remove handles until the multiplex is ready"); // 71
// 72
delete self._handles[id]; // 73
// 74
Package.facts && Package.facts.Facts.incrementServerFact( // 75
"mongo-livedata", "observe-handles", -1); // 76
// 77
if (_.isEmpty(self._handles) && // 78
self._addHandleTasksScheduledButNotPerformed === 0) { // 79
self._stop(); // 80
} // 81
}, // 82
_stop: function (options) { // 83
var self = this; // 84
options = options || {}; // 85
// 86
// It shouldn't be possible for us to stop when all our handles still // 87
// haven't been returned from observeChanges! // 88
if (! self._ready() && ! options.fromQueryError) // 89
throw Error("surprising _stop: not ready"); // 90
// 91
// Call stop callback (which kills the underlying process which sends us // 92
// callbacks and removes us from the connection's dictionary). // 93
self._onStop(); // 94
Package.facts && Package.facts.Facts.incrementServerFact( // 95
"mongo-livedata", "observe-multiplexers", -1); // 96
// 97
// Cause future addHandleAndSendInitialAdds calls to throw (but the onStop // 98
// callback should make our connection forget about us). // 99
self._handles = null; // 100
}, // 101
// 102
// Allows all addHandleAndSendInitialAdds calls to return, once all preceding // 103
// adds have been processed. Does not block. // 104
ready: function () { // 105
var self = this; // 106
self._queue.queueTask(function () { // 107
if (self._ready()) // 108
throw Error("can't make ObserveMultiplex ready twice!"); // 109
self._readyFuture.return(); // 110
}); // 111
}, // 112
// 113
// If trying to execute the query results in an error, call this. This is // 114
// intended for permanent errors, not transient network errors that could be // 115
// fixed. It should only be called before ready(), because if you called ready // 116
// that meant that you managed to run the query once. It will stop this // 117
// ObserveMultiplex and cause addHandleAndSendInitialAdds calls (and thus // 118
// observeChanges calls) to throw the error. // 119
queryError: function (err) { // 120
var self = this; // 121
self._queue.runTask(function () { // 122
if (self._ready()) // 123
throw Error("can't claim query has an error after it worked!"); // 124
self._stop({fromQueryError: true}); // 125
self._readyFuture.throw(err); // 126
}); // 127
}, // 128
// 129
// Calls "cb" once the effects of all "ready", "addHandleAndSendInitialAdds" // 130
// and observe callbacks which came before this call have been propagated to // 131
// all handles. "ready" must have already been called on this multiplexer. // 132
onFlush: function (cb) { // 133
var self = this; // 134
self._queue.queueTask(function () { // 135
if (!self._ready()) // 136
throw Error("only call onFlush on a multiplexer that will be ready"); // 137
cb(); // 138
}); // 139
}, // 140
callbackNames: function () { // 141
var self = this; // 142
if (self._ordered) // 143
return ["addedBefore", "changed", "movedBefore", "removed"]; // 144
else // 145
return ["added", "changed", "removed"]; // 146
}, // 147
_ready: function () { // 148
return this._readyFuture.isResolved(); // 149
}, // 150
_applyCallback: function (callbackName, args) { // 151
var self = this; // 152
self._queue.queueTask(function () { // 153
// If we stopped in the meantime, do nothing. // 154
if (!self._handles) // 155
return; // 156
// 157
// First, apply the change to the cache. // 158
// XXX We could make applyChange callbacks promise not to hang on to any // 159
// state from their arguments (assuming that their supplied callbacks // 160
// don't) and skip this clone. Currently 'changed' hangs on to state // 161
// though. // 162
self._cache.applyChange[callbackName].apply(null, EJSON.clone(args)); // 163
// 164
// If we haven't finished the initial adds, then we should only be getting // 165
// adds. // 166
if (!self._ready() && // 167
(callbackName !== 'added' && callbackName !== 'addedBefore')) { // 168
throw new Error("Got " + callbackName + " during initial adds"); // 169
} // 170
// 171
// Now multiplex the callbacks out to all observe handles. It's OK if // 172
// these calls yield; since we're inside a task, no other use of our queue // 173
// can continue until these are done. (But we do have to be careful to not // 174
// use a handle that got removed, because removeHandle does not use the // 175
// queue; thus, we iterate over an array of keys that we control.) // 176
_.each(_.keys(self._handles), function (handleId) { // 177
var handle = self._handles && self._handles[handleId]; // 178
if (!handle) // 179
return; // 180
var callback = handle['_' + callbackName]; // 181
// clone arguments so that callbacks can mutate their arguments // 182
callback && callback.apply(null, EJSON.clone(args)); // 183
}); // 184
}); // 185
}, // 186
// 187
// Sends initial adds to a handle. It should only be called from within a task // 188
// (the task that is processing the addHandleAndSendInitialAdds call). It // 189
// synchronously invokes the handle's added or addedBefore; there's no need to // 190
// flush the queue afterwards to ensure that the callbacks get out. // 191
_sendAdds: function (handle) { // 192
var self = this; // 193
if (self._queue.safeToRunTask()) // 194
throw Error("_sendAdds may only be called from within a task!"); // 195
var add = self._ordered ? handle._addedBefore : handle._added; // 196
if (!add) // 197
return; // 198
// note: docs may be an _IdMap or an OrderedDict // 199
self._cache.docs.forEach(function (doc, id) { // 200
if (!_.has(self._handles, handle._id)) // 201
throw Error("handle got removed before sending initial adds!"); // 202
var fields = EJSON.clone(doc); // 203
delete fields._id; // 204
if (self._ordered) // 205
add(id, fields, null); // we're going in order, so add at end // 206
else // 207
add(id, fields); // 208
}); // 209
} // 210
}); // 211
// 212
// 213
var nextObserveHandleId = 1; // 214
ObserveHandle = function (multiplexer, callbacks) { // 215
var self = this; // 216
// The end user is only supposed to call stop(). The other fields are // 217
// accessible to the multiplexer, though. // 218
self._multiplexer = multiplexer; // 219
_.each(multiplexer.callbackNames(), function (name) { // 220
if (callbacks[name]) { // 221
self['_' + name] = callbacks[name]; // 222
} else if (name === "addedBefore" && callbacks.added) { // 223
// Special case: if you specify "added" and "movedBefore", you get an // 224
// ordered observe where for some reason you don't get ordering data on // 225
// the adds. I dunno, we wrote tests for it, there must have been a // 226
// reason. // 227
self._addedBefore = function (id, fields, before) { // 228
callbacks.added(id, fields); // 229
}; // 230
} // 231
}); // 232
self._stopped = false; // 233
self._id = nextObserveHandleId++; // 234
}; // 235
ObserveHandle.prototype.stop = function () { // 236
var self = this; // 237
if (self._stopped) // 238
return; // 239
self._stopped = true; // 240
self._multiplexer.removeHandle(self._id); // 241
}; // 242
// 243
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/doc_fetcher.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
var Fiber = Npm.require('fibers'); // 1
var Future = Npm.require('fibers/future'); // 2
// 3
DocFetcher = function (mongoConnection) { // 4
var self = this; // 5
self._mongoConnection = mongoConnection; // 6
// Map from cache key -> [callback] // 7
self._callbacksForCacheKey = {}; // 8
}; // 9
// 10
_.extend(DocFetcher.prototype, { // 11
// Fetches document "id" from collectionName, returning it or null if not // 12
// found. // 13
// // 14
// If you make multiple calls to fetch() with the same cacheKey (a string), // 15
// DocFetcher may assume that they all return the same document. (It does // 16
// not check to see if collectionName/id match.) // 17
// // 18
// You may assume that callback is never called synchronously (and in fact // 19
// OplogObserveDriver does so). // 20
fetch: function (collectionName, id, cacheKey, callback) { // 21
var self = this; // 22
// 23
check(collectionName, String); // 24
// id is some sort of scalar // 25
check(cacheKey, String); // 26
// 27
// If there's already an in-progress fetch for this cache key, yield until // 28
// it's done and return whatever it returns. // 29
if (_.has(self._callbacksForCacheKey, cacheKey)) { // 30
self._callbacksForCacheKey[cacheKey].push(callback); // 31
return; // 32
} // 33
// 34
var callbacks = self._callbacksForCacheKey[cacheKey] = [callback]; // 35
// 36
Fiber(function () { // 37
try { // 38
var doc = self._mongoConnection.findOne( // 39
collectionName, {_id: id}) || null; // 40
// Return doc to all relevant callbacks. Note that this array can // 41
// continue to grow during callback excecution. // 42
while (!_.isEmpty(callbacks)) { // 43
// Clone the document so that the various calls to fetch don't return // 44
// objects that are intertwingled with each other. Clone before // 45
// popping the future, so that if clone throws, the error gets passed // 46
// to the next callback. // 47
var clonedDoc = EJSON.clone(doc); // 48
callbacks.pop()(null, clonedDoc); // 49
} // 50
} catch (e) { // 51
while (!_.isEmpty(callbacks)) { // 52
callbacks.pop()(e); // 53
} // 54
} finally { // 55
// XXX consider keeping the doc around for a period of time before // 56
// removing from the cache // 57
delete self._callbacksForCacheKey[cacheKey]; // 58
} // 59
}).run(); // 60
} // 61
}); // 62
// 63
MongoTest.DocFetcher = DocFetcher; // 64
// 65
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/polling_observe_driver.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
PollingObserveDriver = function (options) { // 1
var self = this; // 2
// 3
self._cursorDescription = options.cursorDescription; // 4
self._mongoHandle = options.mongoHandle; // 5
self._ordered = options.ordered; // 6
self._multiplexer = options.multiplexer; // 7
self._stopCallbacks = []; // 8
self._stopped = false; // 9
// 10
self._synchronousCursor = self._mongoHandle._createSynchronousCursor( // 11
self._cursorDescription); // 12
// 13
// previous results snapshot. on each poll cycle, diffs against // 14
// results drives the callbacks. // 15
self._results = null; // 16
// 17
// The number of _pollMongo calls that have been added to self._taskQueue but // 18
// have not started running. Used to make sure we never schedule more than one // 19
// _pollMongo (other than possibly the one that is currently running). It's // 20
// also used by _suspendPolling to pretend there's a poll scheduled. Usually, // 21
// it's either 0 (for "no polls scheduled other than maybe one currently // 22
// running") or 1 (for "a poll scheduled that isn't running yet"), but it can // 23
// also be 2 if incremented by _suspendPolling. // 24
self._pollsScheduledButNotStarted = 0; // 25
self._pendingWrites = []; // people to notify when polling completes // 26
// 27
// Make sure to create a separately throttled function for each // 28
// PollingObserveDriver object. // 29
self._ensurePollIsScheduled = _.throttle( // 30
self._unthrottledEnsurePollIsScheduled, 50 /* ms */); // 31
// 32
// XXX figure out if we still need a queue // 33
self._taskQueue = new Meteor._SynchronousQueue(); // 34
// 35
var listenersHandle = listenAll( // 36
self._cursorDescription, function (notification) { // 37
// When someone does a transaction that might affect us, schedule a poll // 38
// of the database. If that transaction happens inside of a write fence, // 39
// block the fence until we've polled and notified observers. // 40
var fence = DDPServer._CurrentWriteFence.get(); // 41
if (fence) // 42
self._pendingWrites.push(fence.beginWrite()); // 43
// Ensure a poll is scheduled... but if we already know that one is, // 44
// don't hit the throttled _ensurePollIsScheduled function (which might // 45
// lead to us calling it unnecessarily in 50ms). // 46
if (self._pollsScheduledButNotStarted === 0) // 47
self._ensurePollIsScheduled(); // 48
} // 49
); // 50
self._stopCallbacks.push(function () { listenersHandle.stop(); }); // 51
// 52
// every once and a while, poll even if we don't think we're dirty, for // 53
// eventual consistency with database writes from outside the Meteor // 54
// universe. // 55
// // 56
// For testing, there's an undocumented callback argument to observeChanges // 57
// which disables time-based polling and gets called at the beginning of each // 58
// poll. // 59
if (options._testOnlyPollCallback) { // 60
self._testOnlyPollCallback = options._testOnlyPollCallback; // 61
} else { // 62
var intervalHandle = Meteor.setInterval( // 63
_.bind(self._ensurePollIsScheduled, self), 10 * 1000); // 64
self._stopCallbacks.push(function () { // 65
Meteor.clearInterval(intervalHandle); // 66
}); // 67
} // 68
// 69
// Make sure we actually poll soon! // 70
self._unthrottledEnsurePollIsScheduled(); // 71
// 72
Package.facts && Package.facts.Facts.incrementServerFact( // 73
"mongo-livedata", "observe-drivers-polling", 1); // 74
}; // 75
// 76
_.extend(PollingObserveDriver.prototype, { // 77
// This is always called through _.throttle (except once at startup). // 78
_unthrottledEnsurePollIsScheduled: function () { // 79
var self = this; // 80
if (self._pollsScheduledButNotStarted > 0) // 81
return; // 82
++self._pollsScheduledButNotStarted; // 83
self._taskQueue.queueTask(function () { // 84
self._pollMongo(); // 85
}); // 86
}, // 87
// 88
// test-only interface for controlling polling. // 89
// // 90
// _suspendPolling blocks until any currently running and scheduled polls are // 91
// done, and prevents any further polls from being scheduled. (new // 92
// ObserveHandles can be added and receive their initial added callbacks, // 93
// though.) // 94
// // 95
// _resumePolling immediately polls, and allows further polls to occur. // 96
_suspendPolling: function() { // 97
var self = this; // 98
// Pretend that there's another poll scheduled (which will prevent // 99
// _ensurePollIsScheduled from queueing any more polls). // 100
++self._pollsScheduledButNotStarted; // 101
// Now block until all currently running or scheduled polls are done. // 102
self._taskQueue.runTask(function() {}); // 103
// 104
// Confirm that there is only one "poll" (the fake one we're pretending to // 105
// have) scheduled. // 106
if (self._pollsScheduledButNotStarted !== 1) // 107
throw new Error("_pollsScheduledButNotStarted is " + // 108
self._pollsScheduledButNotStarted); // 109
}, // 110
_resumePolling: function() { // 111
var self = this; // 112
// We should be in the same state as in the end of _suspendPolling. // 113
if (self._pollsScheduledButNotStarted !== 1) // 114
throw new Error("_pollsScheduledButNotStarted is " + // 115
self._pollsScheduledButNotStarted); // 116
// Run a poll synchronously (which will counteract the // 117
// ++_pollsScheduledButNotStarted from _suspendPolling). // 118
self._taskQueue.runTask(function () { // 119
self._pollMongo(); // 120
}); // 121
}, // 122
// 123
_pollMongo: function () { // 124
var self = this; // 125
--self._pollsScheduledButNotStarted; // 126
// 127
if (self._stopped) // 128
return; // 129
// 130
var first = false; // 131
var oldResults = self._results; // 132
if (!oldResults) { // 133
first = true; // 134
// XXX maybe use OrderedDict instead? // 135
oldResults = self._ordered ? [] : new LocalCollection._IdMap; // 136
} // 137
// 138
self._testOnlyPollCallback && self._testOnlyPollCallback(); // 139
// 140
// Save the list of pending writes which this round will commit. // 141
var writesForCycle = self._pendingWrites; // 142
self._pendingWrites = []; // 143
// 144
// Get the new query results. (This yields.) // 145
try { // 146
var newResults = self._synchronousCursor.getRawObjects(self._ordered); // 147
} catch (e) { // 148
if (first && typeof(e.code) === 'number') { // 149
// This is an error document sent to us by mongod, not a connection // 150
// error generated by the client. And we've never seen this query work // 151
// successfully. Probably it's a bad selector or something, so we should // 152
// NOT retry. Instead, we should halt the observe (which ends up calling // 153
// `stop` on us). // 154
self._multiplexer.queryError( // 155
new Error( // 156
"Exception while polling query " + // 157
JSON.stringify(self._cursorDescription) + ": " + e.message)); // 158
return; // 159
} // 160
// 161
// getRawObjects can throw if we're having trouble talking to the // 162
// database. That's fine --- we will repoll later anyway. But we should // 163
// make sure not to lose track of this cycle's writes. // 164
// (It also can throw if there's just something invalid about this query; // 165
// unfortunately the ObserveDriver API doesn't provide a good way to // 166
// "cancel" the observe from the inside in this case. // 167
Array.prototype.push.apply(self._pendingWrites, writesForCycle); // 168
Meteor._debug("Exception while polling query " + // 169
JSON.stringify(self._cursorDescription) + ": " + e.stack); // 170
return; // 171
} // 172
// 173
// Run diffs. // 174
if (!self._stopped) { // 175
LocalCollection._diffQueryChanges( // 176
self._ordered, oldResults, newResults, self._multiplexer); // 177
} // 178
// 179
// Signals the multiplexer to allow all observeChanges calls that share this // 180
// multiplexer to return. (This happens asynchronously, via the // 181
// multiplexer's queue.) // 182
if (first) // 183
self._multiplexer.ready(); // 184
// 185
// Replace self._results atomically. (This assignment is what makes `first` // 186
// stay through on the next cycle, so we've waited until after we've // 187
// committed to ready-ing the multiplexer.) // 188
self._results = newResults; // 189
// 190
// Once the ObserveMultiplexer has processed everything we've done in this // 191
// round, mark all the writes which existed before this call as // 192
// commmitted. (If new writes have shown up in the meantime, there'll // 193
// already be another _pollMongo task scheduled.) // 194
self._multiplexer.onFlush(function () { // 195
_.each(writesForCycle, function (w) { // 196
w.committed(); // 197
}); // 198
}); // 199
}, // 200
// 201
stop: function () { // 202
var self = this; // 203
self._stopped = true; // 204
_.each(self._stopCallbacks, function (c) { c(); }); // 205
// Release any write fences that are waiting on us. // 206
_.each(self._pendingWrites, function (w) { // 207
w.committed(); // 208
}); // 209
Package.facts && Package.facts.Facts.incrementServerFact( // 210
"mongo-livedata", "observe-drivers-polling", -1); // 211
} // 212
}); // 213
// 214
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/oplog_observe_driver.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
var Fiber = Npm.require('fibers'); // 1
var Future = Npm.require('fibers/future'); // 2
// 3
var PHASE = { // 4
QUERYING: "QUERYING", // 5
FETCHING: "FETCHING", // 6
STEADY: "STEADY" // 7
}; // 8
// 9
// Exception thrown by _needToPollQuery which unrolls the stack up to the // 10
// enclosing call to finishIfNeedToPollQuery. // 11
var SwitchedToQuery = function () {}; // 12
var finishIfNeedToPollQuery = function (f) { // 13
return function () { // 14
try { // 15
f.apply(this, arguments); // 16
} catch (e) { // 17
if (!(e instanceof SwitchedToQuery)) // 18
throw e; // 19
} // 20
}; // 21
}; // 22
// 23
// OplogObserveDriver is an alternative to PollingObserveDriver which follows // 24
// the Mongo operation log instead of just re-polling the query. It obeys the // 25
// same simple interface: constructing it starts sending observeChanges // 26
// callbacks (and a ready() invocation) to the ObserveMultiplexer, and you stop // 27
// it by calling the stop() method. // 28
OplogObserveDriver = function (options) { // 29
var self = this; // 30
self._usesOplog = true; // tests look at this // 31
// 32
self._cursorDescription = options.cursorDescription; // 33
self._mongoHandle = options.mongoHandle; // 34
self._multiplexer = options.multiplexer; // 35
// 36
if (options.ordered) { // 37
throw Error("OplogObserveDriver only supports unordered observeChanges"); // 38
} // 39
// 40
var sorter = options.sorter; // 41
// We don't support $near and other geo-queries so it's OK to initialize the // 42
// comparator only once in the constructor. // 43
var comparator = sorter && sorter.getComparator(); // 44
// 45
if (options.cursorDescription.options.limit) { // 46
// There are several properties ordered driver implements: // 47
// - _limit is a positive number // 48
// - _comparator is a function-comparator by which the query is ordered // 49
// - _unpublishedBuffer is non-null Min/Max Heap, // 50
// the empty buffer in STEADY phase implies that the // 51
// everything that matches the queries selector fits // 52
// into published set. // 53
// - _published - Min Heap (also implements IdMap methods) // 54
// 55
var heapOptions = { IdMap: LocalCollection._IdMap }; // 56
self._limit = self._cursorDescription.options.limit; // 57
self._comparator = comparator; // 58
self._sorter = sorter; // 59
self._unpublishedBuffer = new MinMaxHeap(comparator, heapOptions); // 60
// We need something that can find Max value in addition to IdMap interface // 61
self._published = new MaxHeap(comparator, heapOptions); // 62
} else { // 63
self._limit = 0; // 64
self._comparator = null; // 65
self._sorter = null; // 66
self._unpublishedBuffer = null; // 67
self._published = new LocalCollection._IdMap; // 68
} // 69
// 70
// Indicates if it is safe to insert a new document at the end of the buffer // 71
// for this query. i.e. it is known that there are no documents matching the // 72
// selector those are not in published or buffer. // 73
self._safeAppendToBuffer = false; // 74
// 75
self._stopped = false; // 76
self._stopHandles = []; // 77
// 78
Package.facts && Package.facts.Facts.incrementServerFact( // 79
"mongo-livedata", "observe-drivers-oplog", 1); // 80
// 81
self._registerPhaseChange(PHASE.QUERYING); // 82
// 83
var selector = self._cursorDescription.selector; // 84
self._matcher = options.matcher; // 85
var projection = self._cursorDescription.options.fields || {}; // 86
self._projectionFn = LocalCollection._compileProjection(projection); // 87
// Projection function, result of combining important fields for selector and // 88
// existing fields projection // 89
self._sharedProjection = self._matcher.combineIntoProjection(projection); // 90
if (sorter) // 91
self._sharedProjection = sorter.combineIntoProjection(self._sharedProjection); // 92
self._sharedProjectionFn = LocalCollection._compileProjection( // 93
self._sharedProjection); // 94
// 95
self._needToFetch = new LocalCollection._IdMap; // 96
self._currentlyFetching = null; // 97
self._fetchGeneration = 0; // 98
// 99
self._requeryWhenDoneThisQuery = false; // 100
self._writesToCommitWhenWeReachSteady = []; // 101
// 102
// If the oplog handle tells us that it skipped some entries (because it got // 103
// behind, say), re-poll. // 104
self._stopHandles.push(self._mongoHandle._oplogHandle.onSkippedEntries( // 105
finishIfNeedToPollQuery(function () { // 106
self._needToPollQuery(); // 107
}) // 108
)); // 109
// 110
forEachTrigger(self._cursorDescription, function (trigger) { // 111
self._stopHandles.push(self._mongoHandle._oplogHandle.onOplogEntry( // 112
trigger, function (notification) { // 113
Meteor._noYieldsAllowed(finishIfNeedToPollQuery(function () { // 114
var op = notification.op; // 115
if (notification.dropCollection) { // 116
// Note: this call is not allowed to block on anything (especially // 117
// on waiting for oplog entries to catch up) because that will block // 118
// onOplogEntry! // 119
self._needToPollQuery(); // 120
} else { // 121
// All other operators should be handled depending on phase // 122
if (self._phase === PHASE.QUERYING) // 123
self._handleOplogEntryQuerying(op); // 124
else // 125
self._handleOplogEntrySteadyOrFetching(op); // 126
} // 127
})); // 128
} // 129
)); // 130
}); // 131
// 132
// XXX ordering w.r.t. everything else? // 133
self._stopHandles.push(listenAll( // 134
self._cursorDescription, function (notification) { // 135
// If we're not in a write fence, we don't have to do anything. // 136
var fence = DDPServer._CurrentWriteFence.get(); // 137
if (!fence) // 138
return; // 139
var write = fence.beginWrite(); // 140
// This write cannot complete until we've caught up to "this point" in the // 141
// oplog, and then made it back to the steady state. // 142
Meteor.defer(function () { // 143
self._mongoHandle._oplogHandle.waitUntilCaughtUp(); // 144
if (self._stopped) { // 145
// We're stopped, so just immediately commit. // 146
write.committed(); // 147
} else if (self._phase === PHASE.STEADY) { // 148
// Make sure that all of the callbacks have made it through the // 149
// multiplexer and been delivered to ObserveHandles before committing // 150
// writes. // 151
self._multiplexer.onFlush(function () { // 152
write.committed(); // 153
}); // 154
} else { // 155
self._writesToCommitWhenWeReachSteady.push(write); // 156
} // 157
}); // 158
} // 159
)); // 160
// 161
// When Mongo fails over, we need to repoll the query, in case we processed an // 162
// oplog entry that got rolled back. // 163
self._stopHandles.push(self._mongoHandle._onFailover(finishIfNeedToPollQuery( // 164
function () { // 165
self._needToPollQuery(); // 166
}))); // 167
// 168
// Give _observeChanges a chance to add the new ObserveHandle to our // 169
// multiplexer, so that the added calls get streamed. // 170
Meteor.defer(finishIfNeedToPollQuery(function () { // 171
self._runInitialQuery(); // 172
})); // 173
}; // 174
// 175
_.extend(OplogObserveDriver.prototype, { // 176
_addPublished: function (id, doc) { // 177
var self = this; // 178
Meteor._noYieldsAllowed(function () { // 179
var fields = _.clone(doc); // 180
delete fields._id; // 181
self._published.set(id, self._sharedProjectionFn(doc)); // 182
self._multiplexer.added(id, self._projectionFn(fields)); // 183
// 184
// After adding this document, the published set might be overflowed // 185
// (exceeding capacity specified by limit). If so, push the maximum // 186
// element to the buffer, we might want to save it in memory to reduce the // 187
// amount of Mongo lookups in the future. // 188
if (self._limit && self._published.size() > self._limit) { // 189
// XXX in theory the size of published is no more than limit+1 // 190
if (self._published.size() !== self._limit + 1) { // 191
throw new Error("After adding to published, " + // 192
(self._published.size() - self._limit) + // 193
" documents are overflowing the set"); // 194
} // 195
// 196
var overflowingDocId = self._published.maxElementId(); // 197
var overflowingDoc = self._published.get(overflowingDocId); // 198
// 199
if (EJSON.equals(overflowingDocId, id)) { // 200
throw new Error("The document just added is overflowing the published set"); // 201
} // 202
// 203
self._published.remove(overflowingDocId); // 204
self._multiplexer.removed(overflowingDocId); // 205
self._addBuffered(overflowingDocId, overflowingDoc); // 206
} // 207
}); // 208
}, // 209
_removePublished: function (id) { // 210
var self = this; // 211
Meteor._noYieldsAllowed(function () { // 212
self._published.remove(id); // 213
self._multiplexer.removed(id); // 214
if (! self._limit || self._published.size() === self._limit) // 215
return; // 216
// 217
if (self._published.size() > self._limit) // 218
throw Error("self._published got too big"); // 219
// 220
// OK, we are publishing less than the limit. Maybe we should look in the // 221
// buffer to find the next element past what we were publishing before. // 222
// 223
if (!self._unpublishedBuffer.empty()) { // 224
// There's something in the buffer; move the first thing in it to // 225
// _published. // 226
var newDocId = self._unpublishedBuffer.minElementId(); // 227
var newDoc = self._unpublishedBuffer.get(newDocId); // 228
self._removeBuffered(newDocId); // 229
self._addPublished(newDocId, newDoc); // 230
return; // 231
} // 232
// 233
// There's nothing in the buffer. This could mean one of a few things. // 234
// 235
// (a) We could be in the middle of re-running the query (specifically, we // 236
// could be in _publishNewResults). In that case, _unpublishedBuffer is // 237
// empty because we clear it at the beginning of _publishNewResults. In // 238
// this case, our caller already knows the entire answer to the query and // 239
// we don't need to do anything fancy here. Just return. // 240
if (self._phase === PHASE.QUERYING) // 241
return; // 242
// 243
// (b) We're pretty confident that the union of _published and // 244
// _unpublishedBuffer contain all documents that match selector. Because // 245
// _unpublishedBuffer is empty, that means we're confident that _published // 246
// contains all documents that match selector. So we have nothing to do. // 247
if (self._safeAppendToBuffer) // 248
return; // 249
// 250
// (c) Maybe there are other documents out there that should be in our // 251
// buffer. But in that case, when we emptied _unpublishedBuffer in // 252
// _removeBuffered, we should have called _needToPollQuery, which will // 253
// either put something in _unpublishedBuffer or set _safeAppendToBuffer // 254
// (or both), and it will put us in QUERYING for that whole time. So in // 255
// fact, we shouldn't be able to get here. // 256
// 257
throw new Error("Buffer inexplicably empty"); // 258
}); // 259
}, // 260
_changePublished: function (id, oldDoc, newDoc) { // 261
var self = this; // 262
Meteor._noYieldsAllowed(function () { // 263
self._published.set(id, self._sharedProjectionFn(newDoc)); // 264
var projectedNew = self._projectionFn(newDoc); // 265
var projectedOld = self._projectionFn(oldDoc); // 266
var changed = LocalCollection._makeChangedFields( // 267
projectedNew, projectedOld); // 268
if (!_.isEmpty(changed)) // 269
self._multiplexer.changed(id, changed); // 270
}); // 271
}, // 272
_addBuffered: function (id, doc) { // 273
var self = this; // 274
Meteor._noYieldsAllowed(function () { // 275
self._unpublishedBuffer.set(id, self._sharedProjectionFn(doc)); // 276
// 277
// If something is overflowing the buffer, we just remove it from cache // 278
if (self._unpublishedBuffer.size() > self._limit) { // 279
var maxBufferedId = self._unpublishedBuffer.maxElementId(); // 280
// 281
self._unpublishedBuffer.remove(maxBufferedId); // 282
// 283
// Since something matching is removed from cache (both published set and // 284
// buffer), set flag to false // 285
self._safeAppendToBuffer = false; // 286
} // 287
}); // 288
}, // 289
// Is called either to remove the doc completely from matching set or to move // 290
// it to the published set later. // 291
_removeBuffered: function (id) { // 292
var self = this; // 293
Meteor._noYieldsAllowed(function () { // 294
self._unpublishedBuffer.remove(id); // 295
// To keep the contract "buffer is never empty in STEADY phase unless the // 296
// everything matching fits into published" true, we poll everything as // 297
// soon as we see the buffer becoming empty. // 298
if (! self._unpublishedBuffer.size() && ! self._safeAppendToBuffer) // 299
self._needToPollQuery(); // 300
}); // 301
}, // 302
// Called when a document has joined the "Matching" results set. // 303
// Takes responsibility of keeping _unpublishedBuffer in sync with _published // 304
// and the effect of limit enforced. // 305
_addMatching: function (doc) { // 306
var self = this; // 307
Meteor._noYieldsAllowed(function () { // 308
var id = doc._id; // 309
if (self._published.has(id)) // 310
throw Error("tried to add something already published " + id); // 311
if (self._limit && self._unpublishedBuffer.has(id)) // 312
throw Error("tried to add something already existed in buffer " + id); // 313
// 314
var limit = self._limit; // 315
var comparator = self._comparator; // 316
var maxPublished = (limit && self._published.size() > 0) ? // 317
self._published.get(self._published.maxElementId()) : null; // 318
var maxBuffered = (limit && self._unpublishedBuffer.size() > 0) // 319
? self._unpublishedBuffer.get(self._unpublishedBuffer.maxElementId()) // 320
: null; // 321
// The query is unlimited or didn't publish enough documents yet or the // 322
// new document would fit into published set pushing the maximum element // 323
// out, then we need to publish the doc. // 324
var toPublish = ! limit || self._published.size() < limit || // 325
comparator(doc, maxPublished) < 0; // 326
// 327
// Otherwise we might need to buffer it (only in case of limited query). // 328
// Buffering is allowed if the buffer is not filled up yet and all // 329
// matching docs are either in the published set or in the buffer. // 330
var canAppendToBuffer = !toPublish && self._safeAppendToBuffer && // 331
self._unpublishedBuffer.size() < limit; // 332
// 333
// Or if it is small enough to be safely inserted to the middle or the // 334
// beginning of the buffer. // 335
var canInsertIntoBuffer = !toPublish && maxBuffered && // 336
comparator(doc, maxBuffered) <= 0; // 337
// 338
var toBuffer = canAppendToBuffer || canInsertIntoBuffer; // 339
// 340
if (toPublish) { // 341
self._addPublished(id, doc); // 342
} else if (toBuffer) { // 343
self._addBuffered(id, doc); // 344
} else { // 345
// dropping it and not saving to the cache // 346
self._safeAppendToBuffer = false; // 347
} // 348
}); // 349
}, // 350
// Called when a document leaves the "Matching" results set. // 351
// Takes responsibility of keeping _unpublishedBuffer in sync with _published // 352
// and the effect of limit enforced. // 353
_removeMatching: function (id) { // 354
var self = this; // 355
Meteor._noYieldsAllowed(function () { // 356
if (! self._published.has(id) && ! self._limit) // 357
throw Error("tried to remove something matching but not cached " + id); // 358
// 359
if (self._published.has(id)) { // 360
self._removePublished(id); // 361
} else if (self._unpublishedBuffer.has(id)) { // 362
self._removeBuffered(id); // 363
} // 364
}); // 365
}, // 366
_handleDoc: function (id, newDoc) { // 367
var self = this; // 368
Meteor._noYieldsAllowed(function () { // 369
var matchesNow = newDoc && self._matcher.documentMatches(newDoc).result; // 370
// 371
var publishedBefore = self._published.has(id); // 372
var bufferedBefore = self._limit && self._unpublishedBuffer.has(id); // 373
var cachedBefore = publishedBefore || bufferedBefore; // 374
// 375
if (matchesNow && !cachedBefore) { // 376
self._addMatching(newDoc); // 377
} else if (cachedBefore && !matchesNow) { // 378
self._removeMatching(id); // 379
} else if (cachedBefore && matchesNow) { // 380
var oldDoc = self._published.get(id); // 381
var comparator = self._comparator; // 382
var minBuffered = self._limit && self._unpublishedBuffer.size() && // 383
self._unpublishedBuffer.get(self._unpublishedBuffer.minElementId()); // 384
// 385
if (publishedBefore) { // 386
// Unlimited case where the document stays in published once it // 387
// matches or the case when we don't have enough matching docs to // 388
// publish or the changed but matching doc will stay in published // 389
// anyways. // 390
// // 391
// XXX: We rely on the emptiness of buffer. Be sure to maintain the // 392
// fact that buffer can't be empty if there are matching documents not // 393
// published. Notably, we don't want to schedule repoll and continue // 394
// relying on this property. // 395
var staysInPublished = ! self._limit || // 396
self._unpublishedBuffer.size() === 0 || // 397
comparator(newDoc, minBuffered) <= 0; // 398
// 399
if (staysInPublished) { // 400
self._changePublished(id, oldDoc, newDoc); // 401
} else { // 402
// after the change doc doesn't stay in the published, remove it // 403
self._removePublished(id); // 404
// but it can move into buffered now, check it // 405
var maxBuffered = self._unpublishedBuffer.get( // 406
self._unpublishedBuffer.maxElementId()); // 407
// 408
var toBuffer = self._safeAppendToBuffer || // 409
(maxBuffered && comparator(newDoc, maxBuffered) <= 0); // 410
// 411
if (toBuffer) { // 412
self._addBuffered(id, newDoc); // 413
} else { // 414
// Throw away from both published set and buffer // 415
self._safeAppendToBuffer = false; // 416
} // 417
} // 418
} else if (bufferedBefore) { // 419
oldDoc = self._unpublishedBuffer.get(id); // 420
// remove the old version manually instead of using _removeBuffered so // 421
// we don't trigger the querying immediately. if we end this block // 422
// with the buffer empty, we will need to trigger the query poll // 423
// manually too. // 424
self._unpublishedBuffer.remove(id); // 425
// 426
var maxPublished = self._published.get( // 427
self._published.maxElementId()); // 428
var maxBuffered = self._unpublishedBuffer.size() && // 429
self._unpublishedBuffer.get( // 430
self._unpublishedBuffer.maxElementId()); // 431
// 432
// the buffered doc was updated, it could move to published // 433
var toPublish = comparator(newDoc, maxPublished) < 0; // 434
// 435
// or stays in buffer even after the change // 436
var staysInBuffer = (! toPublish && self._safeAppendToBuffer) || // 437
(!toPublish && maxBuffered && // 438
comparator(newDoc, maxBuffered) <= 0); // 439
// 440
if (toPublish) { // 441
self._addPublished(id, newDoc); // 442
} else if (staysInBuffer) { // 443
// stays in buffer but changes // 444
self._unpublishedBuffer.set(id, newDoc); // 445
} else { // 446
// Throw away from both published set and buffer // 447
self._safeAppendToBuffer = false; // 448
// Normally this check would have been done in _removeBuffered but // 449
// we didn't use it, so we need to do it ourself now. // 450
if (! self._unpublishedBuffer.size()) { // 451
self._needToPollQuery(); // 452
} // 453
} // 454
} else { // 455
throw new Error("cachedBefore implies either of publishedBefore or bufferedBefore is true."); // 456
} // 457
} // 458
}); // 459
}, // 460
_fetchModifiedDocuments: function () { // 461
var self = this; // 462
Meteor._noYieldsAllowed(function () { // 463
self._registerPhaseChange(PHASE.FETCHING); // 464
// Defer, because nothing called from the oplog entry handler may yield, // 465
// but fetch() yields. // 466
Meteor.defer(finishIfNeedToPollQuery(function () { // 467
while (!self._stopped && !self._needToFetch.empty()) { // 468
if (self._phase === PHASE.QUERYING) { // 469
// While fetching, we decided to go into QUERYING mode, and then we // 470
// saw another oplog entry, so _needToFetch is not empty. But we // 471
// shouldn't fetch these documents until AFTER the query is done. // 472
break; // 473
} // 474
// 475
// Being in steady phase here would be surprising. // 476
if (self._phase !== PHASE.FETCHING) // 477
throw new Error("phase in fetchModifiedDocuments: " + self._phase); // 478
// 479
self._currentlyFetching = self._needToFetch; // 480
var thisGeneration = ++self._fetchGeneration; // 481
self._needToFetch = new LocalCollection._IdMap; // 482
var waiting = 0; // 483
var fut = new Future; // 484
// This loop is safe, because _currentlyFetching will not be updated // 485
// during this loop (in fact, it is never mutated). // 486
self._currentlyFetching.forEach(function (cacheKey, id) { // 487
waiting++; // 488
self._mongoHandle._docFetcher.fetch( // 489
self._cursorDescription.collectionName, id, cacheKey, // 490
finishIfNeedToPollQuery(function (err, doc) { // 491
try { // 492
if (err) { // 493
Meteor._debug("Got exception while fetching documents: " + // 494
err); // 495
// If we get an error from the fetcher (eg, trouble // 496
// connecting to Mongo), let's just abandon the fetch phase // 497
// altogether and fall back to polling. It's not like we're // 498
// getting live updates anyway. // 499
if (self._phase !== PHASE.QUERYING) { // 500
self._needToPollQuery(); // 501
} // 502
} else if (!self._stopped && self._phase === PHASE.FETCHING // 503
&& self._fetchGeneration === thisGeneration) { // 504
// We re-check the generation in case we've had an explicit // 505
// _pollQuery call (eg, in another fiber) which should // 506
// effectively cancel this round of fetches. (_pollQuery // 507
// increments the generation.) // 508
self._handleDoc(id, doc); // 509
} // 510
} finally { // 511
waiting--; // 512
// Because fetch() never calls its callback synchronously, // 513
// this is safe (ie, we won't call fut.return() before the // 514
// forEach is done). // 515
if (waiting === 0) // 516
fut.return(); // 517
} // 518
})); // 519
}); // 520
fut.wait(); // 521
// Exit now if we've had a _pollQuery call (here or in another fiber). // 522
if (self._phase === PHASE.QUERYING) // 523
return; // 524
self._currentlyFetching = null; // 525
} // 526
// We're done fetching, so we can be steady, unless we've had a // 527
// _pollQuery call (here or in another fiber). // 528
if (self._phase !== PHASE.QUERYING) // 529
self._beSteady(); // 530
})); // 531
}); // 532
}, // 533
_beSteady: function () { // 534
var self = this; // 535
Meteor._noYieldsAllowed(function () { // 536
self._registerPhaseChange(PHASE.STEADY); // 537
var writes = self._writesToCommitWhenWeReachSteady; // 538
self._writesToCommitWhenWeReachSteady = []; // 539
self._multiplexer.onFlush(function () { // 540
_.each(writes, function (w) { // 541
w.committed(); // 542
}); // 543
}); // 544
}); // 545
}, // 546
_handleOplogEntryQuerying: function (op) { // 547
var self = this; // 548
Meteor._noYieldsAllowed(function () { // 549
self._needToFetch.set(idForOp(op), op.ts.toString()); // 550
}); // 551
}, // 552
_handleOplogEntrySteadyOrFetching: function (op) { // 553
var self = this; // 554
Meteor._noYieldsAllowed(function () { // 555
var id = idForOp(op); // 556
// If we're already fetching this one, or about to, we can't optimize; // 557
// make sure that we fetch it again if necessary. // 558
if (self._phase === PHASE.FETCHING && // 559
((self._currentlyFetching && self._currentlyFetching.has(id)) || // 560
self._needToFetch.has(id))) { // 561
self._needToFetch.set(id, op.ts.toString()); // 562
return; // 563
} // 564
// 565
if (op.op === 'd') { // 566
if (self._published.has(id) || // 567
(self._limit && self._unpublishedBuffer.has(id))) // 568
self._removeMatching(id); // 569
} else if (op.op === 'i') { // 570
if (self._published.has(id)) // 571
throw new Error("insert found for already-existing ID in published"); // 572
if (self._unpublishedBuffer && self._unpublishedBuffer.has(id)) // 573
throw new Error("insert found for already-existing ID in buffer"); // 574
// 575
// XXX what if selector yields? for now it can't but later it could // 576
// have $where // 577
if (self._matcher.documentMatches(op.o).result) // 578
self._addMatching(op.o); // 579
} else if (op.op === 'u') { // 580
// Is this a modifier ($set/$unset, which may require us to poll the // 581
// database to figure out if the whole document matches the selector) or // 582
// a replacement (in which case we can just directly re-evaluate the // 583
// selector)? // 584
var isReplace = !_.has(op.o, '$set') && !_.has(op.o, '$unset'); // 585
// If this modifier modifies something inside an EJSON custom type (ie, // 586
// anything with EJSON$), then we can't try to use // 587
// LocalCollection._modify, since that just mutates the EJSON encoding, // 588
// not the actual object. // 589
var canDirectlyModifyDoc = // 590
!isReplace && modifierCanBeDirectlyApplied(op.o); // 591
// 592
var publishedBefore = self._published.has(id); // 593
var bufferedBefore = self._limit && self._unpublishedBuffer.has(id); // 594
// 595
if (isReplace) { // 596
self._handleDoc(id, _.extend({_id: id}, op.o)); // 597
} else if ((publishedBefore || bufferedBefore) && // 598
canDirectlyModifyDoc) { // 599
// Oh great, we actually know what the document is, so we can apply // 600
// this directly. // 601
var newDoc = self._published.has(id) // 602
? self._published.get(id) : self._unpublishedBuffer.get(id); // 603
newDoc = EJSON.clone(newDoc); // 604
// 605
newDoc._id = id; // 606
try { // 607
LocalCollection._modify(newDoc, op.o); // 608
} catch (e) { // 609
if (e.name !== "MinimongoError") // 610
throw e; // 611
// We didn't understand the modifier. Re-fetch. // 612
self._needToFetch.set(id, op.ts.toString()); // 613
if (self._phase === PHASE.STEADY) { // 614
self._fetchModifiedDocuments(); // 615
} // 616
return; // 617
} // 618
self._handleDoc(id, self._sharedProjectionFn(newDoc)); // 619
} else if (!canDirectlyModifyDoc || // 620
self._matcher.canBecomeTrueByModifier(op.o) || // 621
(self._sorter && self._sorter.affectedByModifier(op.o))) { // 622
self._needToFetch.set(id, op.ts.toString()); // 623
if (self._phase === PHASE.STEADY) // 624
self._fetchModifiedDocuments(); // 625
} // 626
} else { // 627
throw Error("XXX SURPRISING OPERATION: " + op); // 628
} // 629
}); // 630
}, // 631
// Yields! // 632
_runInitialQuery: function () { // 633
var self = this; // 634
if (self._stopped) // 635
throw new Error("oplog stopped surprisingly early"); // 636
// 637
self._runQuery({initial: true}); // yields // 638
// 639
if (self._stopped) // 640
return; // can happen on queryError // 641
// 642
// Allow observeChanges calls to return. (After this, it's possible for // 643
// stop() to be called.) // 644
self._multiplexer.ready(); // 645
// 646
self._doneQuerying(); // yields // 647
}, // 648
// 649
// In various circumstances, we may just want to stop processing the oplog and // 650
// re-run the initial query, just as if we were a PollingObserveDriver. // 651
// // 652
// This function may not block, because it is called from an oplog entry // 653
// handler. // 654
// // 655
// XXX We should call this when we detect that we've been in FETCHING for "too // 656
// long". // 657
// // 658
// XXX We should call this when we detect Mongo failover (since that might // 659
// mean that some of the oplog entries we have processed have been rolled // 660
// back). The Node Mongo driver is in the middle of a bunch of huge // 661
// refactorings, including the way that it notifies you when primary // 662
// changes. Will put off implementing this until driver 1.4 is out. // 663
_pollQuery: function () { // 664
var self = this; // 665
Meteor._noYieldsAllowed(function () { // 666
if (self._stopped) // 667
return; // 668
// 669
// Yay, we get to forget about all the things we thought we had to fetch. // 670
self._needToFetch = new LocalCollection._IdMap; // 671
self._currentlyFetching = null; // 672
++self._fetchGeneration; // ignore any in-flight fetches // 673
self._registerPhaseChange(PHASE.QUERYING); // 674
// 675
// Defer so that we don't yield. We don't need finishIfNeedToPollQuery // 676
// here because SwitchedToQuery is not thrown in QUERYING mode. // 677
Meteor.defer(function () { // 678
self._runQuery(); // 679
self._doneQuerying(); // 680
}); // 681
}); // 682
}, // 683
// 684
// Yields! // 685
_runQuery: function (options) { // 686
var self = this; // 687
options = options || {}; // 688
var newResults, newBuffer; // 689
// 690
// This while loop is just to retry failures. // 691
while (true) { // 692
// If we've been stopped, we don't have to run anything any more. // 693
if (self._stopped) // 694
return; // 695
// 696
newResults = new LocalCollection._IdMap; // 697
newBuffer = new LocalCollection._IdMap; // 698
// 699
// Query 2x documents as the half excluded from the original query will go // 700
// into unpublished buffer to reduce additional Mongo lookups in cases // 701
// when documents are removed from the published set and need a // 702
// replacement. // 703
// XXX needs more thought on non-zero skip // 704
// XXX 2 is a "magic number" meaning there is an extra chunk of docs for // 705
// buffer if such is needed. // 706
var cursor = self._cursorForQuery({ limit: self._limit * 2 }); // 707
try { // 708
cursor.forEach(function (doc, i) { // yields // 709
if (!self._limit || i < self._limit) // 710
newResults.set(doc._id, doc); // 711
else // 712
newBuffer.set(doc._id, doc); // 713
}); // 714
break; // 715
} catch (e) { // 716
if (options.initial && typeof(e.code) === 'number') { // 717
// This is an error document sent to us by mongod, not a connection // 718
// error generated by the client. And we've never seen this query work // 719
// successfully. Probably it's a bad selector or something, so we // 720
// should NOT retry. Instead, we should halt the observe (which ends // 721
// up calling `stop` on us). // 722
self._multiplexer.queryError(e); // 723
return; // 724
} // 725
// 726
// During failover (eg) if we get an exception we should log and retry // 727
// instead of crashing. // 728
Meteor._debug("Got exception while polling query: " + e); // 729
Meteor._sleepForMs(100); // 730
} // 731
} // 732
// 733
if (self._stopped) // 734
return; // 735
// 736
self._publishNewResults(newResults, newBuffer); // 737
}, // 738
// 739
// Transitions to QUERYING and runs another query, or (if already in QUERYING) // 740
// ensures that we will query again later. // 741
// // 742
// This function may not block, because it is called from an oplog entry // 743
// handler. However, if we were not already in the QUERYING phase, it throws // 744
// an exception that is caught by the closest surrounding // 745
// finishIfNeedToPollQuery call; this ensures that we don't continue running // 746
// close that was designed for another phase inside PHASE.QUERYING. // 747
// // 748
// (It's also necessary whenever logic in this file yields to check that other // 749
// phases haven't put us into QUERYING mode, though; eg, // 750
// _fetchModifiedDocuments does this.) // 751
_needToPollQuery: function () { // 752
var self = this; // 753
Meteor._noYieldsAllowed(function () { // 754
if (self._stopped) // 755
return; // 756
// 757
// If we're not already in the middle of a query, we can query now // 758
// (possibly pausing FETCHING). // 759
if (self._phase !== PHASE.QUERYING) { // 760
self._pollQuery(); // 761
throw new SwitchedToQuery; // 762
} // 763
// 764
// We're currently in QUERYING. Set a flag to ensure that we run another // 765
// query when we're done. // 766
self._requeryWhenDoneThisQuery = true; // 767
}); // 768
}, // 769
// 770
// Yields! // 771
_doneQuerying: function () { // 772
var self = this; // 773
// 774
if (self._stopped) // 775
return; // 776
self._mongoHandle._oplogHandle.waitUntilCaughtUp(); // yields // 777
if (self._stopped) // 778
return; // 779
if (self._phase !== PHASE.QUERYING) // 780
throw Error("Phase unexpectedly " + self._phase); // 781
// 782
Meteor._noYieldsAllowed(function () { // 783
if (self._requeryWhenDoneThisQuery) { // 784
self._requeryWhenDoneThisQuery = false; // 785
self._pollQuery(); // 786
} else if (self._needToFetch.empty()) { // 787
self._beSteady(); // 788
} else { // 789
self._fetchModifiedDocuments(); // 790
} // 791
}); // 792
}, // 793
// 794
_cursorForQuery: function (optionsOverwrite) { // 795
var self = this; // 796
return Meteor._noYieldsAllowed(function () { // 797
// The query we run is almost the same as the cursor we are observing, // 798
// with a few changes. We need to read all the fields that are relevant to // 799
// the selector, not just the fields we are going to publish (that's the // 800
// "shared" projection). And we don't want to apply any transform in the // 801
// cursor, because observeChanges shouldn't use the transform. // 802
var options = _.clone(self._cursorDescription.options); // 803
// 804
// Allow the caller to modify the options. Useful to specify different // 805
// skip and limit values. // 806
_.extend(options, optionsOverwrite); // 807
// 808
options.fields = self._sharedProjection; // 809
delete options.transform; // 810
// We are NOT deep cloning fields or selector here, which should be OK. // 811
var description = new CursorDescription( // 812
self._cursorDescription.collectionName, // 813
self._cursorDescription.selector, // 814
options); // 815
return new Cursor(self._mongoHandle, description); // 816
}); // 817
}, // 818
// 819
// 820
// Replace self._published with newResults (both are IdMaps), invoking observe // 821
// callbacks on the multiplexer. // 822
// Replace self._unpublishedBuffer with newBuffer. // 823
// // 824
// XXX This is very similar to LocalCollection._diffQueryUnorderedChanges. We // 825
// should really: (a) Unify IdMap and OrderedDict into Unordered/OrderedDict // 826
// (b) Rewrite diff.js to use these classes instead of arrays and objects. // 827
_publishNewResults: function (newResults, newBuffer) { // 828
var self = this; // 829
Meteor._noYieldsAllowed(function () { // 830
// 831
// If the query is limited and there is a buffer, shut down so it doesn't // 832
// stay in a way. // 833
if (self._limit) { // 834
self._unpublishedBuffer.clear(); // 835
} // 836
// 837
// First remove anything that's gone. Be careful not to modify // 838
// self._published while iterating over it. // 839
var idsToRemove = []; // 840
self._published.forEach(function (doc, id) { // 841
if (!newResults.has(id)) // 842
idsToRemove.push(id); // 843
}); // 844
_.each(idsToRemove, function (id) { // 845
self._removePublished(id); // 846
}); // 847
// 848
// Now do adds and changes. // 849
// If self has a buffer and limit, the new fetched result will be // 850
// limited correctly as the query has sort specifier. // 851
newResults.forEach(function (doc, id) { // 852
self._handleDoc(id, doc); // 853
}); // 854
// 855
// Sanity-check that everything we tried to put into _published ended up // 856
// there. // 857
// XXX if this is slow, remove it later // 858
if (self._published.size() !== newResults.size()) { // 859
throw Error( // 860
"The Mongo server and the Meteor query disagree on how " + // 861
"many documents match your query. Maybe it is hitting a Mongo " + // 862
"edge case? The query is: " + // 863
EJSON.stringify(self._cursorDescription.selector)); // 864
} // 865
self._published.forEach(function (doc, id) { // 866
if (!newResults.has(id)) // 867
throw Error("_published has a doc that newResults doesn't; " + id); // 868
}); // 869
// 870
// Finally, replace the buffer // 871
newBuffer.forEach(function (doc, id) { // 872
self._addBuffered(id, doc); // 873
}); // 874
// 875
self._safeAppendToBuffer = newBuffer.size() < self._limit; // 876
}); // 877
}, // 878
// 879
// This stop function is invoked from the onStop of the ObserveMultiplexer, so // 880
// it shouldn't actually be possible to call it until the multiplexer is // 881
// ready. // 882
// // 883
// It's important to check self._stopped after every call in this file that // 884
// can yield! // 885
stop: function () { // 886
var self = this; // 887
if (self._stopped) // 888
return; // 889
self._stopped = true; // 890
_.each(self._stopHandles, function (handle) { // 891
handle.stop(); // 892
}); // 893
// 894
// Note: we *don't* use multiplexer.onFlush here because this stop // 895
// callback is actually invoked by the multiplexer itself when it has // 896
// determined that there are no handles left. So nothing is actually going // 897
// to get flushed (and it's probably not valid to call methods on the // 898
// dying multiplexer). // 899
_.each(self._writesToCommitWhenWeReachSteady, function (w) { // 900
w.committed(); // maybe yields? // 901
}); // 902
self._writesToCommitWhenWeReachSteady = null; // 903
// 904
// Proactively drop references to potentially big things. // 905
self._published = null; // 906
self._unpublishedBuffer = null; // 907
self._needToFetch = null; // 908
self._currentlyFetching = null; // 909
self._oplogEntryHandle = null; // 910
self._listenersHandle = null; // 911
// 912
Package.facts && Package.facts.Facts.incrementServerFact( // 913
"mongo-livedata", "observe-drivers-oplog", -1); // 914
}, // 915
// 916
_registerPhaseChange: function (phase) { // 917
var self = this; // 918
Meteor._noYieldsAllowed(function () { // 919
var now = new Date; // 920
// 921
if (self._phase) { // 922
var timeDiff = now - self._phaseStartTime; // 923
Package.facts && Package.facts.Facts.incrementServerFact( // 924
"mongo-livedata", "time-spent-in-" + self._phase + "-phase", timeDiff); // 925
} // 926
// 927
self._phase = phase; // 928
self._phaseStartTime = now; // 929
}); // 930
} // 931
}); // 932
// 933
// Does our oplog tailing code support this cursor? For now, we are being very // 934
// conservative and allowing only simple queries with simple options. // 935
// (This is a "static method".) // 936
OplogObserveDriver.cursorSupported = function (cursorDescription, matcher) { // 937
// First, check the options. // 938
var options = cursorDescription.options; // 939
// 940
// Did the user say no explicitly? // 941
if (options._disableOplog) // 942
return false; // 943
// 944
// skip is not supported: to support it we would need to keep track of all // 945
// "skipped" documents or at least their ids. // 946
// limit w/o a sort specifier is not supported: current implementation needs a // 947
// deterministic way to order documents. // 948
if (options.skip || (options.limit && !options.sort)) return false; // 949
// 950
// If a fields projection option is given check if it is supported by // 951
// minimongo (some operators are not supported). // 952
if (options.fields) { // 953
try { // 954
LocalCollection._checkSupportedProjection(options.fields); // 955
} catch (e) { // 956
if (e.name === "MinimongoError") // 957
return false; // 958
else // 959
throw e; // 960
} // 961
} // 962
// 963
// We don't allow the following selectors: // 964
// - $where (not confident that we provide the same JS environment // 965
// as Mongo, and can yield!) // 966
// - $near (has "interesting" properties in MongoDB, like the possibility // 967
// of returning an ID multiple times, though even polling maybe // 968
// have a bug there) // 969
// XXX: once we support it, we would need to think more on how we // 970
// initialize the comparators when we create the driver. // 971
return !matcher.hasWhere() && !matcher.hasGeoQuery(); // 972
}; // 973
// 974
var modifierCanBeDirectlyApplied = function (modifier) { // 975
return _.all(modifier, function (fields, operation) { // 976
return _.all(fields, function (value, field) { // 977
return !/EJSON\$/.test(field); // 978
}); // 979
}); // 980
}; // 981
// 982
MongoInternals.OplogObserveDriver = OplogObserveDriver; // 983
// 984
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/local_collection_driver.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
LocalCollectionDriver = function () { // 1
var self = this; // 2
self.noConnCollections = {}; // 3
}; // 4
// 5
var ensureCollection = function (name, collections) { // 6
if (!(name in collections)) // 7
collections[name] = new LocalCollection(name); // 8
return collections[name]; // 9
}; // 10
// 11
_.extend(LocalCollectionDriver.prototype, { // 12
open: function (name, conn) { // 13
var self = this; // 14
if (!name) // 15
return new LocalCollection; // 16
if (! conn) { // 17
return ensureCollection(name, self.noConnCollections); // 18
} // 19
if (! conn._mongo_livedata_collections) // 20
conn._mongo_livedata_collections = {}; // 21
// XXX is there a way to keep track of a connection's collections without // 22
// dangling it off the connection object? // 23
return ensureCollection(name, conn._mongo_livedata_collections); // 24
} // 25
}); // 26
// 27
// singleton // 28
LocalCollectionDriver = new LocalCollectionDriver; // 29
// 30
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/remote_collection_driver.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
MongoInternals.RemoteCollectionDriver = function ( // 1
mongo_url, options) { // 2
var self = this; // 3
self.mongo = new MongoConnection(mongo_url, options); // 4
}; // 5
// 6
_.extend(MongoInternals.RemoteCollectionDriver.prototype, { // 7
open: function (name) { // 8
var self = this; // 9
var ret = {}; // 10
_.each( // 11
['find', 'findOne', 'insert', 'update', 'upsert', // 12
'remove', '_ensureIndex', '_dropIndex', '_createCappedCollection', // 13
'dropCollection', 'rawCollection'], // 14
function (m) { // 15
ret[m] = _.bind(self.mongo[m], self.mongo, name); // 16
}); // 17
return ret; // 18
} // 19
}); // 20
// 21
// 22
// Create the singleton RemoteCollectionDriver only on demand, so we // 23
// only require Mongo configuration if it's actually used (eg, not if // 24
// you're only trying to receive data from a remote DDP server.) // 25
MongoInternals.defaultRemoteCollectionDriver = _.once(function () { // 26
var connectionOptions = {}; // 27
// 28
var mongoUrl = process.env.MONGO_URL; // 29
// 30
if (process.env.MONGO_OPLOG_URL) { // 31
connectionOptions.oplogUrl = process.env.MONGO_OPLOG_URL; // 32
} // 33
// 34
if (! mongoUrl) // 35
throw new Error("MONGO_URL must be set in environment"); // 36
// 37
return new MongoInternals.RemoteCollectionDriver(mongoUrl, connectionOptions); // 38
}); // 39
// 40
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
(function () {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //
// packages/mongo/collection.js //
// //
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// options.connection, if given, is a LivedataClient or LivedataServer // 1
// XXX presently there is no way to destroy/clean up a Collection // 2
// 3
/** // 4
* @summary Namespace for MongoDB-related items // 5
* @namespace // 6
*/ // 7
Mongo = {}; // 8
// 9
/** // 10
* @summary Constructor for a Collection // 11
* @locus Anywhere // 12
* @instancename collection // 13
* @class // 14
* @param {String} name The name of the collection. If null, creates an unmanaged (unsynchronized) local collection. // 15
* @param {Object} [options] // 16
* @param {Object} options.connection The server connection that will manage this collection. Uses the default connection if not specified. Pass the return value of calling [`DDP.connect`](#ddp_connect) to specify a different server. Pass `null` to specify no connection. Unmanaged (`name` is null) collections cannot specify a connection.
* @param {String} options.idGeneration The method of generating the `_id` fields of new documents in this collection. Possible values:
// 19
- **`'STRING'`**: random strings // 20
- **`'MONGO'`**: random [`Mongo.ObjectID`](#mongo_object_id) values // 21
// 22
The default id generation technique is `'STRING'`. // 23
* @param {Function} options.transform An optional transformation function. Documents will be passed through this function before being returned from `fetch` or `findOne`, and before being passed to callbacks of `observe`, `map`, `forEach`, `allow`, and `deny`. Transforms are *not* applied for the callbacks of `observeChanges` or to cursors returned from publish functions.
*/ // 25
Mongo.Collection = function (name, options) { // 26
var self = this; // 27
if (! (self instanceof Mongo.Collection)) // 28
throw new Error('use "new" to construct a Mongo.Collection'); // 29
// 30
if (!name && (name !== null)) { // 31
Meteor._debug("Warning: creating anonymous collection. It will not be " + // 32
"saved or synchronized over the network. (Pass null for " + // 33
"the collection name to turn off this warning.)"); // 34
name = null; // 35
} // 36
// 37
if (name !== null && typeof name !== "string") { // 38
throw new Error( // 39
"First argument to new Mongo.Collection must be a string or null"); // 40
} // 41
// 42
if (options && options.methods) { // 43
// Backwards compatibility hack with original signature (which passed // 44
// "connection" directly instead of in options. (Connections must have a "methods" // 45
// method.) // 46
// XXX remove before 1.0 // 47
options = {connection: options}; // 48
} // 49
// Backwards compatibility: "connection" used to be called "manager". // 50
if (options && options.manager && !options.connection) { // 51
options.connection = options.manager; // 52
} // 53
options = _.extend({ // 54
connection: undefined, // 55
idGeneration: 'STRING', // 56
transform: null, // 57
_driver: undefined, // 58
_preventAutopublish: false // 59
}, options); // 60
// 61
switch (options.idGeneration) { // 62
case 'MONGO': // 63
self._makeNewID = function () { // 64
var src = name ? DDP.randomStream('/collection/' + name) : Random; // 65
return new Mongo.ObjectID(src.hexString(24)); // 66
}; // 67
break; // 68
case 'STRING': // 69
default: // 70
self._makeNewID = function () { // 71
var src = name ? DDP.randomStream('/collection/' + name) : Random; // 72
return src.id(); // 73
}; // 74
break; // 75
} // 76
// 77
self._transform = LocalCollection.wrapTransform(options.transform); // 78
// 79
if (! name || options.connection === null) // 80
// note: nameless collections never have a connection // 81
self._connection = null; // 82
else if (options.connection) // 83
self._connection = options.connection; // 84
else if (Meteor.isClient) // 85
self._connection = Meteor.connection; // 86
else // 87
self._connection = Meteor.server; // 88
// 89
if (!options._driver) { // 90
// XXX This check assumes that webapp is loaded so that Meteor.server !== // 91
// null. We should fully support the case of "want to use a Mongo-backed // 92
// collection from Node code without webapp", but we don't yet. // 93
// #MeteorServerNull // 94
if (name && self._connection === Meteor.server && // 95
typeof MongoInternals !== "undefined" && // 96
MongoInternals.defaultRemoteCollectionDriver) { // 97
options._driver = MongoInternals.defaultRemoteCollectionDriver(); // 98
} else { // 99
options._driver = LocalCollectionDriver; // 100
} // 101
} // 102
// 103
self._collection = options._driver.open(name, self._connection); // 104
self._name = name; // 105
self._driver = options._driver; // 106
// 107
if (self._connection && self._connection.registerStore) { // 108
// OK, we're going to be a slave, replicating some remote // 109
// database, except possibly with some temporary divergence while // 110
// we have unacknowledged RPC's. // 111
var ok = self._connection.registerStore(name, { // 112
// Called at the beginning of a batch of updates. batchSize is the number // 113
// of update calls to expect. // 114
// // 115
// XXX This interface is pretty janky. reset probably ought to go back to // 116
// being its own function, and callers shouldn't have to calculate // 117
// batchSize. The optimization of not calling pause/remove should be // 118
// delayed until later: the first call to update() should buffer its // 119
// message, and then we can either directly apply it at endUpdate time if // 120
// it was the only update, or do pauseObservers/apply/apply at the next // 121
// update() if there's another one. // 122
beginUpdate: function (batchSize, reset) { // 123
// pause observers so users don't see flicker when updating several // 124
// objects at once (including the post-reconnect reset-and-reapply // 125
// stage), and so that a re-sorting of a query can take advantage of the // 126
// full _diffQuery moved calculation instead of applying change one at a // 127
// time. // 128
if (batchSize > 1 || reset) // 129
self._collection.pauseObservers(); // 130
// 131
if (reset) // 132
self._collection.remove({}); // 133
}, // 134
// 135
// Apply an update. // 136
// XXX better specify this interface (not in terms of a wire message)? // 137
update: function (msg) { // 138
var mongoId = LocalCollection._idParse(msg.id); // 139
var doc = self._collection.findOne(mongoId); // 140
// 141
// Is this a "replace the whole doc" message coming from the quiescence // 142
// of method writes to an object? (Note that 'undefined' is a valid // 143
// value meaning "remove it".) // 144
if (msg.msg === 'replace') { // 145
var replace = msg.replace; // 146
if (!replace) { // 147
if (doc) // 148
self._collection.remove(mongoId); // 149
} else if (!doc) { // 150
self._collection.insert(replace); // 151
} else { // 152
// XXX check that replace has no $ ops // 153
self._collection.update(mongoId, replace); // 154
} // 155
return; // 156
} else if (msg.msg === 'added') { // 157
if (doc) { // 158
throw new Error("Expected not to find a document already present for an add"); // 159
} // 160
self._collection.insert(_.extend({_id: mongoId}, msg.fields)); // 161
} else if (msg.msg === 'removed') { // 162
if (!doc) // 163
throw new Error("Expected to find a document already present for removed"); // 164
self._collection.remove(mongoId); // 165
} else if (msg.msg === 'changed') { // 166
if (!doc) // 167
throw new Error("Expected to find a document to change"); // 168
if (!_.isEmpty(msg.fields)) { // 169
var modifier = {}; // 170
_.each(msg.fields, function (value, key) { // 171
if (value === undefined) { // 172
if (!modifier.$unset) // 173
modifier.$unset = {}; // 174
modifier.$unset[key] = 1; // 175
} else { // 176
if (!modifier.$set) // 177
modifier.$set = {}; // 178
modifier.$set[key] = value; // 179
} // 180
}); // 181
self._collection.update(mongoId, modifier); // 182
} // 183
} else { // 184
throw new Error("I don't know how to deal with this message"); // 185
} // 186
// 187
}, // 188
// 189
// Called at the end of a batch of updates. // 190
endUpdate: function () { // 191
self._collection.resumeObservers(); // 192
}, // 193
// 194
// Called around method stub invocations to capture the original versions // 195
// of modified documents. // 196
saveOriginals: function () { // 197
self._collection.saveOriginals(); // 198
}, // 199
retrieveOriginals: function () { // 200
return self._collection.retrieveOriginals(); // 201
} // 202
}); // 203
// 204
if (!ok) // 205
throw new Error("There is already a collection named '" + name + "'"); // 206
} // 207
// 208
self._defineMutationMethods(); // 209
// 210
// autopublish // 211
if (Package.autopublish && !options._preventAutopublish && self._connection // 212
&& self._connection.publish) { // 213
self._connection.publish(null, function () { // 214
return self.find(); // 215
}, {is_auto: true}); // 216
} // 217
}; // 218
// 219
/// // 220
/// Main collection API // 221
/// // 222
// 223
// 224
_.extend(Mongo.Collection.prototype, { // 225
// 226
_getFindSelector: function (args) { // 227
if (args.length == 0) // 228
return {}; // 229
else // 230
return args[0]; // 231
}, // 232
// 233
_getFindOptions: function (args) { // 234
var self = this; // 235
if (args.length < 2) { // 236
return { transform: self._transform }; // 237
} else { // 238
check(args[1], Match.Optional(Match.ObjectIncluding({ // 239
fields: Match.Optional(Match.OneOf(Object, undefined)), // 240
sort: Match.Optional(Match.OneOf(Object, Array, undefined)), // 241
limit: Match.Optional(Match.OneOf(Number, undefined)), // 242
skip: Match.Optional(Match.OneOf(Number, undefined)) // 243
}))); // 244
// 245
return _.extend({ // 246
transform: self._transform // 247
}, args[1]); // 248
} // 249
}, // 250
// 251
/** // 252
* @summary Find the documents in a collection that match the selector. // 253
* @locus Anywhere // 254
* @method find // 255
* @memberOf Mongo.Collection // 256
* @instance // 257
* @param {MongoSelector} [selector] A query describing the documents to find // 258
* @param {Object} [options] // 259
* @param {MongoSortSpecifier} options.sort Sort order (default: natural order) // 260
* @param {Number} options.skip Number of results to skip at the beginning // 261
* @param {Number} options.limit Maximum number of results to return // 262
* @param {MongoFieldSpecifier} options.fields Dictionary of fields to return or exclude. // 263
* @param {Boolean} options.reactive (Client only) Default `true`; pass `false` to disable reactivity // 264
* @param {Function} options.transform Overrides `transform` on the [`Collection`](#collections) for this cursor. Pass `null` to disable transformation.
* @returns {Mongo.Cursor} // 266
*/ // 267
find: function (/* selector, options */) { // 268
// Collection.find() (return all docs) behaves differently // 269
// from Collection.find(undefined) (return 0 docs). so be // 270
// careful about the length of arguments. // 271
var self = this; // 272
var argArray = _.toArray(arguments); // 273
return self._collection.find(self._getFindSelector(argArray), // 274
self._getFindOptions(argArray)); // 275
}, // 276
// 277
/** // 278
* @summary Finds the first document that matches the selector, as ordered by sort and skip options. // 279
* @locus Anywhere // 280
* @method findOne // 281
* @memberOf Mongo.Collection // 282
* @instance // 283
* @param {MongoSelector} [selector] A query describing the documents to find // 284
* @param {Object} [options] // 285
* @param {MongoSortSpecifier} options.sort Sort order (default: natural order) // 286
* @param {Number} options.skip Number of results to skip at the beginning // 287
* @param {MongoFieldSpecifier} options.fields Dictionary of fields to return or exclude. // 288
* @param {Boolean} options.reactive (Client only) Default true; pass false to disable reactivity // 289
* @param {Function} options.transform Overrides `transform` on the [`Collection`](#collections) for this cursor. Pass `null` to disable transformation.
* @returns {Object} // 291
*/ // 292
findOne: function (/* selector, options */) { // 293
var self = this; // 294
var argArray = _.toArray(arguments); // 295
return self._collection.findOne(self._getFindSelector(argArray), // 296
self._getFindOptions(argArray)); // 297
} // 298
// 299
}); // 300
// 301
Mongo.Collection._publishCursor = function (cursor, sub, collection) { // 302
var observeHandle = cursor.observeChanges({ // 303
added: function (id, fields) { // 304
sub.added(collection, id, fields); // 305
}, // 306
changed: function (id, fields) { // 307
sub.changed(collection, id, fields); // 308
}, // 309
removed: function (id) { // 310
sub.removed(collection, id); // 311
} // 312
}); // 313
// 314
// We don't call sub.ready() here: it gets called in livedata_server, after // 315
// possibly calling _publishCursor on multiple returned cursors. // 316
// 317
// register stop callback (expects lambda w/ no args). // 318
sub.onStop(function () {observeHandle.stop();}); // 319
}; // 320
// 321
// protect against dangerous selectors. falsey and {_id: falsey} are both // 322
// likely programmer error, and not what you want, particularly for destructive // 323
// operations. JS regexps don't serialize over DDP but can be trivially // 324
// replaced by $regex. // 325
Mongo.Collection._rewriteSelector = function (selector) { // 326
// shorthand -- scalars match _id // 327
if (LocalCollection._selectorIsId(selector)) // 328
selector = {_id: selector}; // 329
// 330
if (!selector || (('_id' in selector) && !selector._id)) // 331
// can't match anything // 332
return {_id: Random.id()}; // 333
// 334
var ret = {}; // 335
_.each(selector, function (value, key) { // 336
// Mongo supports both {field: /foo/} and {field: {$regex: /foo/}} // 337
if (value instanceof RegExp) { // 338
ret[key] = convertRegexpToMongoSelector(value); // 339
} else if (value && value.$regex instanceof RegExp) { // 340
ret[key] = convertRegexpToMongoSelector(value.$regex); // 341
// if value is {$regex: /foo/, $options: ...} then $options // 342
// override the ones set on $regex. // 343
if (value.$options !== undefined) // 344
ret[key].$options = value.$options; // 345
} // 346
else if (_.contains(['$or','$and','$nor'], key)) { // 347
// Translate lower levels of $and/$or/$nor // 348
ret[key] = _.map(value, function (v) { // 349
return Mongo.Collection._rewriteSelector(v); // 350
}); // 351
} else { // 352
ret[key] = value; // 353
} // 354
}); // 355
return ret; // 356
}; // 357
// 358
// convert a JS RegExp object to a Mongo {$regex: ..., $options: ...} // 359
// selector // 360
var convertRegexpToMongoSelector = function (regexp) { // 361
check(regexp, RegExp); // safety belt // 362
// 363
var selector = {$regex: regexp.source}; // 364
var regexOptions = ''; // 365
// JS RegExp objects support 'i', 'm', and 'g'. Mongo regex $options // 366
// support 'i', 'm', 'x', and 's'. So we support 'i' and 'm' here. // 367
if (regexp.ignoreCase) // 368
regexOptions += 'i'; // 369
if (regexp.multiline) // 370
regexOptions += 'm'; // 371
if (regexOptions) // 372
selector.$options = regexOptions; // 373
// 374
return selector; // 375
}; // 376
// 377
var throwIfSelectorIsNotId = function (selector, methodName) { // 378
if (!LocalCollection._selectorIsIdPerhapsAsObject(selector)) { // 379
throw new Meteor.Error( // 380
403, "Not permitted. Untrusted code may only " + methodName + // 381
" documents by ID."); // 382
} // 383
}; // 384
// 385
// 'insert' immediately returns the inserted document's new _id. // 386
// The others return values immediately if you are in a stub, an in-memory // 387
// unmanaged collection, or a mongo-backed collection and you don't pass a // 388
// callback. 'update' and 'remove' return the number of affected // 389
// documents. 'upsert' returns an object with keys 'numberAffected' and, if an // 390
// insert happened, 'insertedId'. // 391
// // 392
// Otherwise, the semantics are exactly like other methods: they take // 393
// a callback as an optional last argument; if no callback is // 394
// provided, they block until the operation is complete, and throw an // 395
// exception if it fails; if a callback is provided, then they don't // 396
// necessarily block, and they call the callback when they finish with error and // 397
// result arguments. (The insert method provides the document ID as its result; // 398
// update and remove provide the number of affected docs as the result; upsert // 399
// provides an object with numberAffected and maybe insertedId.) // 400
// // 401
// On the client, blocking is impossible, so if a callback // 402
// isn't provided, they just return immediately and any error // 403
// information is lost. // 404
// // 405
// There's one more tweak. On the client, if you don't provide a // 406
// callback, then if there is an error, a message will be logged with // 407
// Meteor._debug. // 408
// // 409
// The intent (though this is actually determined by the underlying // 410
// drivers) is that the operations should be done synchronously, not // 411
// generating their result until the database has acknowledged // 412
// them. In the future maybe we should provide a flag to turn this // 413
// off. // 414
// 415
/** // 416
* @summary Insert a document in the collection. Returns its unique _id. // 417
* @locus Anywhere // 418
* @method insert // 419
* @memberOf Mongo.Collection // 420
* @instance // 421
* @param {Object} doc The document to insert. May not yet have an _id attribute, in which case Meteor will generate one for you.
* @param {Function} [callback] Optional. If present, called with an error object as the first argument and, if no error, the _id as the second.
*/ // 424
// 425
/** // 426
* @summary Modify one or more documents in the collection. Returns the number of affected documents. // 427
* @locus Anywhere // 428
* @method update // 429
* @memberOf Mongo.Collection // 430
* @instance // 431
* @param {MongoSelector} selector Specifies which documents to modify // 432
* @param {MongoModifier} modifier Specifies how to modify the documents // 433
* @param {Object} [options] // 434
* @param {Boolean} options.multi True to modify all matching documents; false to only modify one of the matching documents (the default).
* @param {Boolean} options.upsert True to insert a document if no matching documents are found. // 436
* @param {Function} [callback] Optional. If present, called with an error object as the first argument and, if no error, the number of affected documents as the second.
*/ // 438
// 439
/** // 440
* @summary Remove documents from the collection // 441
* @locus Anywhere // 442
* @method remove // 443
* @memberOf Mongo.Collection // 444
* @instance // 445
* @param {MongoSelector} selector Specifies which documents to remove // 446
* @param {Function} [callback] Optional. If present, called with an error object as its argument. // 447
*/ // 448
// 449
_.each(["insert", "update", "remove"], function (name) { // 450
Mongo.Collection.prototype[name] = function (/* arguments */) { // 451
var self = this; // 452
var args = _.toArray(arguments); // 453
var callback; // 454
var insertId; // 455
var ret; // 456
// 457
// Pull off any callback (or perhaps a 'callback' variable that was passed // 458
// in undefined, like how 'upsert' does it). // 459
if (args.length && // 460
(args[args.length - 1] === undefined || // 461
args[args.length - 1] instanceof Function)) { // 462
callback = args.pop(); // 463
} // 464
// 465
if (name === "insert") { // 466
if (!args.length) // 467
throw new Error("insert requires an argument"); // 468
// shallow-copy the document and generate an ID // 469
args[0] = _.extend({}, args[0]); // 470
if ('_id' in args[0]) { // 471
insertId = args[0]._id; // 472
if (!insertId || !(typeof insertId === 'string' // 473
|| insertId instanceof Mongo.ObjectID)) // 474
throw new Error("Meteor requires document _id fields to be non-empty strings or ObjectIDs"); // 475
} else { // 476
var generateId = true; // 477
// Don't generate the id if we're the client and the 'outermost' call // 478
// This optimization saves us passing both the randomSeed and the id // 479
// Passing both is redundant. // 480
if (self._connection && self._connection !== Meteor.server) { // 481
var enclosing = DDP._CurrentInvocation.get(); // 482
if (!enclosing) { // 483
generateId = false; // 484
} // 485
} // 486
if (generateId) { // 487
insertId = args[0]._id = self._makeNewID(); // 488
} // 489
} // 490
} else { // 491
args[0] = Mongo.Collection._rewriteSelector(args[0]); // 492
// 493
if (name === "update") { // 494
// Mutate args but copy the original options object. We need to add // 495
// insertedId to options, but don't want to mutate the caller's options // 496
// object. We need to mutate `args` because we pass `args` into the // 497
// driver below. // 498
var options = args[2] = _.clone(args[2]) || {}; // 499
if (options && typeof options !== "function" && options.upsert) { // 500
// set `insertedId` if absent. `insertedId` is a Meteor extension. // 501
if (options.insertedId) { // 502
if (!(typeof options.insertedId === 'string' // 503
|| options.insertedId instanceof Mongo.ObjectID)) // 504
throw new Error("insertedId must be string or ObjectID"); // 505
} else if (! args[0]._id) { // 506
options.insertedId = self._makeNewID(); // 507
} // 508
} // 509
} // 510
} // 511
// 512
// On inserts, always return the id that we generated; on all other // 513
// operations, just return the result from the collection. // 514
var chooseReturnValueFromCollectionResult = function (result) { // 515
if (name === "insert") { // 516
if (!insertId && result) { // 517
insertId = result; // 518
} // 519
return insertId; // 520
} else { // 521
return result; // 522
} // 523
}; // 524
// 525
var wrappedCallback; // 526
if (callback) { // 527
wrappedCallback = function (error, result) { // 528
callback(error, ! error && chooseReturnValueFromCollectionResult(result)); // 529
}; // 530
} // 531
// 532
// XXX see #MeteorServerNull // 533
if (self._connection && self._connection !== Meteor.server) { // 534
// just remote to another endpoint, propagate return value or // 535
// exception. // 536
// 537
var enclosing = DDP._CurrentInvocation.get(); // 538
var alreadyInSimulation = enclosing && enclosing.isSimulation; // 539
// 540
if (Meteor.isClient && !wrappedCallback && ! alreadyInSimulation) { // 541
// Client can't block, so it can't report errors by exception, // 542
// only by callback. If they forget the callback, give them a // 543
// default one that logs the error, so they aren't totally // 544
// baffled if their writes don't work because their database is // 545
// down. // 546
// Don't give a default callback in simulation, because inside stubs we // 547
// want to return the results from the local collection immediately and // 548
// not force a callback. // 549
wrappedCallback = function (err) { // 550
if (err) // 551
Meteor._debug(name + " failed: " + (err.reason || err.stack)); // 552
}; // 553
} // 554
// 555
if (!alreadyInSimulation && name !== "insert") { // 556
// If we're about to actually send an RPC, we should throw an error if // 557
// this is a non-ID selector, because the mutation methods only allow // 558
// single-ID selectors. (If we don't throw here, we'll see flicker.) // 559
throwIfSelectorIsNotId(args[0], name); // 560
} // 561
// 562
ret = chooseReturnValueFromCollectionResult( // 563
self._connection.apply(self._prefix + name, args, {returnStubValue: true}, wrappedCallback) // 564
); // 565
// 566
} else { // 567
// it's my collection. descend into the collection object // 568
// and propagate any exception. // 569
args.push(wrappedCallback); // 570
try { // 571
// If the user provided a callback and the collection implements this // 572
// operation asynchronously, then queryRet will be undefined, and the // 573
// result will be returned through the callback instead. // 574
var queryRet = self._collection[name].apply(self._collection, args); // 575
ret = chooseReturnValueFromCollectionResult(queryRet); // 576
} catch (e) { // 577
if (callback) { // 578
callback(e); // 579
return null; // 580
} // 581
throw e; // 582
} // 583
} // 584
// 585
// both sync and async, unless we threw an exception, return ret // 586
// (new document ID for insert, num affected for update/remove, object with // 587
// numberAffected and maybe insertedId for upsert). // 588
return ret; // 589
}; // 590
}); // 591
// 592
/** // 593
* @summary Modify one or more documents in the collection, or insert one if no matching documents were found. Returns an object with keys `numberAffected` (the number of documents modified) and `insertedId` (the unique _id of the document that was inserted, if any).
* @locus Anywhere // 595
* @param {MongoSelector} selector Specifies which documents to modify // 596
* @param {MongoModifier} modifier Specifies how to modify the documents // 597
* @param {Object} [options] // 598
* @param {Boolean} options.multi True to modify all matching documents; false to only modify one of the matching documents (the default).
* @param {Function} [callback] Optional. If present, called with an error object as the first argument and, if no error, the number of affected documents as the second.
*/ // 601
Mongo.Collection.prototype.upsert = function (selector, modifier, // 602
options, callback) { // 603
var self = this; // 604
if (! callback && typeof options === "function") { // 605
callback = options; // 606
options = {}; // 607
} // 608
return self.update(selector, modifier, // 609
_.extend({}, options, { _returnObject: true, upsert: true }), // 610
callback); // 611
}; // 612
// 613
// We'll actually design an index API later. For now, we just pass through to // 614
// Mongo's, but make it synchronous. // 615
Mongo.Collection.prototype._ensureIndex = function (index, options) { // 616
var self = this; // 617
if (!self._collection._ensureIndex) // 618
throw new Error("Can only call _ensureIndex on server collections"); // 619
self._collection._ensureIndex(index, options); // 620
}; // 621
Mongo.Collection.prototype._dropIndex = function (index) { // 622
var self = this; // 623
if (!self._collection._dropIndex) // 624
throw new Error("Can only call _dropIndex on server collections"); // 625
self._collection._dropIndex(index); // 626
}; // 627
Mongo.Collection.prototype._dropCollection = function () { // 628
var self = this; // 629
if (!self._collection.dropCollection) // 630
throw new Error("Can only call _dropCollection on server collections"); // 631
self._collection.dropCollection(); // 632
}; // 633
Mongo.Collection.prototype._createCappedCollection = function (byteSize, maxDocuments) { // 634
var self = this; // 635
if (!self._collection._createCappedCollection) // 636
throw new Error("Can only call _createCappedCollection on server collections"); // 637
self._collection._createCappedCollection(byteSize, maxDocuments); // 638
}; // 639
// 640
Mongo.Collection.prototype.rawCollection = function () { // 641
var self = this; // 642
if (! self._collection.rawCollection) { // 643
throw new Error("Can only call rawCollection on server collections"); // 644
} // 645
return self._collection.rawCollection(); // 646
}; // 647
// 648
Mongo.Collection.prototype.rawDatabase = function () { // 649
var self = this; // 650
if (! (self._driver.mongo && self._driver.mongo.db)) { // 651
throw new Error("Can only call rawDatabase on server collections"); // 652
} // 653
return self._driver.mongo.db; // 654
}; // 655
// 656
// 657
/** // 658
* @summary Create a Mongo-style `ObjectID`. If you don't specify a `hexString`, the `ObjectID` will generated randomly (not using MongoDB's ID construction rules).
* @locus Anywhere // 660
* @class // 661
* @param {String} hexString Optional. The 24-character hexadecimal contents of the ObjectID to create // 662
*/ // 663
Mongo.ObjectID = LocalCollection._ObjectID; // 664
// 665
/** // 666
* @summary To create a cursor, use find. To access the documents in a cursor, use forEach, map, or fetch. // 667
* @class // 668
* @instanceName cursor // 669
*/ // 670
Mongo.Cursor = LocalCollection.Cursor; // 671
// 672
/** // 673
* @deprecated in 0.9.1 // 674
*/ // 675
Mongo.Collection.Cursor = Mongo.Cursor; // 676
// 677
/** // 678
* @deprecated in 0.9.1 // 679
*/ // 680
Mongo.Collection.ObjectID = Mongo.ObjectID; // 681
// 682
/// // 683
/// Remote methods and access control. // 684
/// // 685
// 686
// Restrict default mutators on collection. allow() and deny() take the // 687
// same options: // 688
// // 689
// options.insert {Function(userId, doc)} // 690
// return true to allow/deny adding this document // 691
// // 692
// options.update {Function(userId, docs, fields, modifier)} // 693
// return true to allow/deny updating these documents. // 694
// `fields` is passed as an array of fields that are to be modified // 695
// // 696
// options.remove {Function(userId, docs)} // 697
// return true to allow/deny removing these documents // 698
// // 699
// options.fetch {Array} // 700
// Fields to fetch for these validators. If any call to allow or deny // 701
// does not have this option then all fields are loaded. // 702
// // 703
// allow and deny can be called multiple times. The validators are // 704
// evaluated as follows: // 705
// - If neither deny() nor allow() has been called on the collection, // 706
// then the request is allowed if and only if the "insecure" smart // 707
// package is in use. // 708
// - Otherwise, if any deny() function returns true, the request is denied. // 709
// - Otherwise, if any allow() function returns true, the request is allowed. // 710
// - Otherwise, the request is denied. // 711
// // 712
// Meteor may call your deny() and allow() functions in any order, and may not // 713
// call all of them if it is able to make a decision without calling them all // 714
// (so don't include side effects). // 715
// 716
(function () { // 717
var addValidator = function(allowOrDeny, options) { // 718
// validate keys // 719
var VALID_KEYS = ['insert', 'update', 'remove', 'fetch', 'transform']; // 720
_.each(_.keys(options), function (key) { // 721
if (!_.contains(VALID_KEYS, key)) // 722
throw new Error(allowOrDeny + ": Invalid key: " + key); // 723
}); // 724
// 725
var self = this; // 726
self._restricted = true; // 727
// 728
_.each(['insert', 'update', 'remove'], function (name) { // 729
if (options[name]) { // 730
if (!(options[name] instanceof Function)) { // 731
throw new Error(allowOrDeny + ": Value for `" + name + "` must be a function"); // 732
} // 733
// 734
// If the transform is specified at all (including as 'null') in this // 735
// call, then take that; otherwise, take the transform from the // 736
// collection. // 737
if (options.transform === undefined) { // 738
options[name].transform = self._transform; // already wrapped // 739
} else { // 740
options[name].transform = LocalCollection.wrapTransform( // 741
options.transform); // 742
} // 743
// 744
self._validators[name][allowOrDeny].push(options[name]); // 745
} // 746
}); // 747
// 748
// Only update the fetch fields if we're passed things that affect // 749
// fetching. This way allow({}) and allow({insert: f}) don't result in // 750
// setting fetchAllFields // 751
if (options.update || options.remove || options.fetch) { // 752
if (options.fetch && !(options.fetch instanceof Array)) { // 753
throw new Error(allowOrDeny + ": Value for `fetch` must be an array"); // 754
} // 755
self._updateFetch(options.fetch); // 756
} // 757
}; // 758
// 759
/** // 760
* @summary Allow users to write directly to this collection from client code, subject to limitations you define. // 761
* @locus Server // 762
* @param {Object} options // 763
* @param {Function} options.insert,update,remove Functions that look at a proposed modification to the database and return true if it should be allowed.
* @param {String[]} options.fetch Optional performance enhancement. Limits the fields that will be fetched from the database for inspection by your `update` and `remove` functions.
* @param {Function} options.transform Overrides `transform` on the [`Collection`](#collections). Pass `null` to disable transformation.
*/ // 767
Mongo.Collection.prototype.allow = function(options) { // 768
addValidator.call(this, 'allow', options); // 769
}; // 770
// 771
/** // 772
* @summary Override `allow` rules. // 773
* @locus Server // 774
* @param {Object} options // 775
* @param {Function} options.insert,update,remove Functions that look at a proposed modification to the database and return true if it should be denied, even if an [allow](#allow) rule says otherwise.
* @param {String[]} options.fetch Optional performance enhancement. Limits the fields that will be fetched from the database for inspection by your `update` and `remove` functions.
* @param {Function} options.transform Overrides `transform` on the [`Collection`](#collections). Pass `null` to disable transformation.
*/ // 779
Mongo.Collection.prototype.deny = function(options) { // 780
addValidator.call(this, 'deny', options); // 781
}; // 782
})(); // 783
// 784
// 785
Mongo.Collection.prototype._defineMutationMethods = function() { // 786
var self = this; // 787
// 788
// set to true once we call any allow or deny methods. If true, use // 789
// allow/deny semantics. If false, use insecure mode semantics. // 790
self._restricted = false; // 791
// 792
// Insecure mode (default to allowing writes). Defaults to 'undefined' which // 793
// means insecure iff the insecure package is loaded. This property can be // 794
// overriden by tests or packages wishing to change insecure mode behavior of // 795
// their collections. // 796
self._insecure = undefined; // 797
// 798
self._validators = { // 799
insert: {allow: [], deny: []}, // 800
update: {allow: [], deny: []}, // 801
remove: {allow: [], deny: []}, // 802
upsert: {allow: [], deny: []}, // dummy arrays; can't set these! // 803
fetch: [], // 804
fetchAllFields: false // 805
}; // 806
// 807
if (!self._name) // 808
return; // anonymous collection // 809
// 810
// XXX Think about method namespacing. Maybe methods should be // 811
// "Meteor:Mongo:insert/NAME"? // 812
self._prefix = '/' + self._name + '/'; // 813
// 814
// mutation methods // 815
if (self._connection) { // 816
var m = {}; // 817
// 818
_.each(['insert', 'update', 'remove'], function (method) { // 819
m[self._prefix + method] = function (/* ... */) { // 820
// All the methods do their own validation, instead of using check(). // 821
check(arguments, [Match.Any]); // 822
var args = _.toArray(arguments); // 823
try { // 824
// For an insert, if the client didn't specify an _id, generate one // 825
// now; because this uses DDP.randomStream, it will be consistent with // 826
// what the client generated. We generate it now rather than later so // 827
// that if (eg) an allow/deny rule does an insert to the same // 828
// collection (not that it really should), the generated _id will // 829
// still be the first use of the stream and will be consistent. // 830
// // 831
// However, we don't actually stick the _id onto the document yet, // 832
// because we want allow/deny rules to be able to differentiate // 833
// between arbitrary client-specified _id fields and merely // 834
// client-controlled-via-randomSeed fields. // 835
var generatedId = null; // 836
if (method === "insert" && !_.has(args[0], '_id')) { // 837
generatedId = self._makeNewID(); // 838
} // 839
// 840
if (this.isSimulation) { // 841
// In a client simulation, you can do any mutation (even with a // 842
// complex selector). // 843
if (generatedId !== null) // 844
args[0]._id = generatedId; // 845
return self._collection[method].apply( // 846
self._collection, args); // 847
} // 848
// 849
// This is the server receiving a method call from the client. // 850
// 851
// We don't allow arbitrary selectors in mutations from the client: only // 852
// single-ID selectors. // 853
if (method !== 'insert') // 854
throwIfSelectorIsNotId(args[0], method); // 855
// 856
if (self._restricted) { // 857
// short circuit if there is no way it will pass. // 858
if (self._validators[method].allow.length === 0) { // 859
throw new Meteor.Error( // 860
403, "Access denied. No allow validators set on restricted " + // 861
"collection for method '" + method + "'."); // 862
} // 863
// 864
var validatedMethodName = // 865
'_validated' + method.charAt(0).toUpperCase() + method.slice(1); // 866
args.unshift(this.userId); // 867
method === 'insert' && args.push(generatedId); // 868
return self[validatedMethodName].apply(self, args); // 869
} else if (self._isInsecure()) { // 870
if (generatedId !== null) // 871
args[0]._id = generatedId; // 872
// In insecure mode, allow any mutation (with a simple selector). // 873
// XXX This is kind of bogus. Instead of blindly passing whatever // 874
// we get from the network to this function, we should actually // 875
// know the correct arguments for the function and pass just // 876
// them. For example, if you have an extraneous extra null // 877
// argument and this is Mongo on the server, the .wrapAsync'd // 878
// functions like update will get confused and pass the // 879
// "fut.resolver()" in the wrong slot, where _update will never // 880
// invoke it. Bam, broken DDP connection. Probably should just // 881
// take this whole method and write it three times, invoking // 882
// helpers for the common code. // 883
return self._collection[method].apply(self._collection, args); // 884
} else { // 885
// In secure mode, if we haven't called allow or deny, then nothing // 886
// is permitted. // 887
throw new Meteor.Error(403, "Access denied"); // 888
} // 889
} catch (e) { // 890
if (e.name === 'MongoError' || e.name === 'MinimongoError') { // 891
throw new Meteor.Error(409, e.toString()); // 892
} else { // 893
throw e; // 894
} // 895
} // 896
}; // 897
}); // 898
// Minimongo on the server gets no stubs; instead, by default // 899
// it wait()s until its result is ready, yielding. // 900
// This matches the behavior of macromongo on the server better. // 901
// XXX see #MeteorServerNull // 902
if (Meteor.isClient || self._connection === Meteor.server) // 903
self._connection.methods(m); // 904
} // 905
}; // 906
// 907
// 908
Mongo.Collection.prototype._updateFetch = function (fields) { // 909
var self = this; // 910
// 911
if (!self._validators.fetchAllFields) { // 912
if (fields) { // 913
self._validators.fetch = _.union(self._validators.fetch, fields); // 914
} else { // 915
self._validators.fetchAllFields = true; // 916
// clear fetch just to make sure we don't accidentally read it // 917
self._validators.fetch = null; // 918
} // 919
} // 920
}; // 921
// 922
Mongo.Collection.prototype._isInsecure = function () { // 923
var self = this; // 924
if (self._insecure === undefined) // 925
return !!Package.insecure; // 926
return self._insecure; // 927
}; // 928
// 929
var docToValidate = function (validator, doc, generatedId) { // 930
var ret = doc; // 931
if (validator.transform) { // 932
ret = EJSON.clone(doc); // 933
// If you set a server-side transform on your collection, then you don't get // 934
// to tell the difference between "client specified the ID" and "server // 935
// generated the ID", because transforms expect to get _id. If you want to // 936
// do that check, you can do it with a specific // 937
// `C.allow({insert: f, transform: null})` validator. // 938
if (generatedId !== null) { // 939
ret._id = generatedId; // 940
} // 941
ret = validator.transform(ret); // 942
} // 943
return ret; // 944
}; // 945
// 946
Mongo.Collection.prototype._validatedInsert = function (userId, doc, // 947
generatedId) { // 948
var self = this; // 949
// 950
// call user validators. // 951
// Any deny returns true means denied. // 952
if (_.any(self._validators.insert.deny, function(validator) { // 953
return validator(userId, docToValidate(validator, doc, generatedId)); // 954
})) { // 955
throw new Meteor.Error(403, "Access denied"); // 956
} // 957
// Any allow returns true means proceed. Throw error if they all fail. // 958
if (_.all(self._validators.insert.allow, function(validator) { // 959
return !validator(userId, docToValidate(validator, doc, generatedId)); // 960
})) { // 961
throw new Meteor.Error(403, "Access denied"); // 962
} // 963
// 964
// If we generated an ID above, insert it now: after the validation, but // 965
// before actually inserting. // 966
if (generatedId !== null) // 967
doc._id = generatedId; // 968
// 969
self._collection.insert.call(self._collection, doc); // 970
}; // 971
// 972
var transformDoc = function (validator, doc) { // 973
if (validator.transform) // 974
return validator.transform(doc); // 975
return doc; // 976
}; // 977
// 978
// Simulate a mongo `update` operation while validating that the access // 979
// control rules set by calls to `allow/deny` are satisfied. If all // 980
// pass, rewrite the mongo operation to use $in to set the list of // 981
// document ids to change ##ValidatedChange // 982
Mongo.Collection.prototype._validatedUpdate = function( // 983
userId, selector, mutator, options) { // 984
var self = this; // 985
// 986
check(mutator, Object); // 987
// 988
options = _.clone(options) || {}; // 989
// 990
if (!LocalCollection._selectorIsIdPerhapsAsObject(selector)) // 991
throw new Error("validated update should be of a single ID"); // 992
// 993
// We don't support upserts because they don't fit nicely into allow/deny // 994
// rules. // 995
if (options.upsert) // 996
throw new Meteor.Error(403, "Access denied. Upserts not " + // 997
"allowed in a restricted collection."); // 998
// 999
var noReplaceError = "Access denied. In a restricted collection you can only" + // 1000
" update documents, not replace them. Use a Mongo update operator, such " + // 1001
"as '$set'."; // 1002
// 1003
// compute modified fields // 1004
var fields = []; // 1005
if (_.isEmpty(mutator)) { // 1006
throw new Meteor.Error(403, noReplaceError); // 1007
} // 1008
_.each(mutator, function (params, op) { // 1009
if (op.charAt(0) !== '$') { // 1010
throw new Meteor.Error(403, noReplaceError); // 1011
} else if (!_.has(ALLOWED_UPDATE_OPERATIONS, op)) { // 1012
throw new Meteor.Error( // 1013
403, "Access denied. Operator " + op + " not allowed in a restricted collection."); // 1014
} else { // 1015
_.each(_.keys(params), function (field) { // 1016
// treat dotted fields as if they are replacing their // 1017
// top-level part // 1018
if (field.indexOf('.') !== -1) // 1019
field = field.substring(0, field.indexOf('.')); // 1020
// 1021
// record the field we are trying to change // 1022
if (!_.contains(fields, field)) // 1023
fields.push(field); // 1024
}); // 1025
} // 1026
}); // 1027
// 1028
var findOptions = {transform: null}; // 1029
if (!self._validators.fetchAllFields) { // 1030
findOptions.fields = {}; // 1031
_.each(self._validators.fetch, function(fieldName) { // 1032
findOptions.fields[fieldName] = 1; // 1033
}); // 1034
} // 1035
// 1036
var doc = self._collection.findOne(selector, findOptions); // 1037
if (!doc) // none satisfied! // 1038
return 0; // 1039
// 1040
// call user validators. // 1041
// Any deny returns true means denied. // 1042
if (_.any(self._validators.update.deny, function(validator) { // 1043
var factoriedDoc = transformDoc(validator, doc); // 1044
return validator(userId, // 1045
factoriedDoc, // 1046
fields, // 1047
mutator); // 1048
})) { // 1049
throw new Meteor.Error(403, "Access denied"); // 1050
} // 1051
// Any allow returns true means proceed. Throw error if they all fail. // 1052
if (_.all(self._validators.update.allow, function(validator) { // 1053
var factoriedDoc = transformDoc(validator, doc); // 1054
return !validator(userId, // 1055
factoriedDoc, // 1056
fields, // 1057
mutator); // 1058
})) { // 1059
throw new Meteor.Error(403, "Access denied"); // 1060
} // 1061
// 1062
options._forbidReplace = true; // 1063
// 1064
// Back when we supported arbitrary client-provided selectors, we actually // 1065
// rewrote the selector to include an _id clause before passing to Mongo to // 1066
// avoid races, but since selector is guaranteed to already just be an ID, we // 1067
// don't have to any more. // 1068
// 1069
return self._collection.update.call( // 1070
self._collection, selector, mutator, options); // 1071
}; // 1072
// 1073
// Only allow these operations in validated updates. Specifically // 1074
// whitelist operations, rather than blacklist, so new complex // 1075
// operations that are added aren't automatically allowed. A complex // 1076
// operation is one that does more than just modify its target // 1077
// field. For now this contains all update operations except '$rename'. // 1078
// http://docs.mongodb.org/manual/reference/operators/#update // 1079
var ALLOWED_UPDATE_OPERATIONS = { // 1080
$inc:1, $set:1, $unset:1, $addToSet:1, $pop:1, $pullAll:1, $pull:1, // 1081
$pushAll:1, $push:1, $bit:1 // 1082
}; // 1083
// 1084
// Simulate a mongo `remove` operation while validating access control // 1085
// rules. See #ValidatedChange // 1086
Mongo.Collection.prototype._validatedRemove = function(userId, selector) { // 1087
var self = this; // 1088
// 1089
var findOptions = {transform: null}; // 1090
if (!self._validators.fetchAllFields) { // 1091
findOptions.fields = {}; // 1092
_.each(self._validators.fetch, function(fieldName) { // 1093
findOptions.fields[fieldName] = 1; // 1094
}); // 1095
} // 1096
// 1097
var doc = self._collection.findOne(selector, findOptions); // 1098
if (!doc) // 1099
return 0; // 1100
// 1101
// call user validators. // 1102
// Any deny returns true means denied. // 1103
if (_.any(self._validators.remove.deny, function(validator) { // 1104
return validator(userId, transformDoc(validator, doc)); // 1105
})) { // 1106
throw new Meteor.Error(403, "Access denied"); // 1107
} // 1108
// Any allow returns true means proceed. Throw error if they all fail. // 1109
if (_.all(self._validators.remove.allow, function(validator) { // 1110
return !validator(userId, transformDoc(validator, doc)); // 1111
})) { // 1112
throw new Meteor.Error(403, "Access denied"); // 1113
} // 1114
// 1115
// Back when we supported arbitrary client-provided selectors, we actually // 1116
// rewrote the selector to {_id: {$in: [ids that we found]}} before passing to // 1117
// Mongo to avoid races, but since selector is guaranteed to already just be // 1118
// an ID, we don't have to any more. // 1119
// 1120
return self._collection.remove.call(self._collection, selector); // 1121
}; // 1122
// 1123
/** // 1124
* @deprecated in 0.9.1 // 1125
*/ // 1126
Meteor.Collection = Mongo.Collection; // 1127
// 1128
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}).call(this);
/* Exports */
if (typeof Package === 'undefined') Package = {};
Package.mongo = {
MongoInternals: MongoInternals,
MongoTest: MongoTest,
Mongo: Mongo
};
})();
//# sourceMappingURL=mongo.js.map
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