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Remove old experimental remote db code (#4872)

This commit is contained in:
Nikolay Volf 2017-03-12 23:49:33 +04:00 committed by GitHub
parent 3fe3353696
commit 4af49038cd
6 changed files with 0 additions and 872 deletions
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25
db/Cargo.toml
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[package]
description = "Ethcore Database"
homepage = "http://parity.io"
license = "GPL-3.0"
name = "ethcore-db"
version = "1.7.0"
authors = ["Parity Technologies <admin@parity.io>"]
build = "build.rs"
[build-dependencies]
ethcore-ipc-codegen = { path = "../ipc/codegen" }
[dependencies]
clippy = { version = "0.0.103", optional = true}
ethcore-devtools = { path = "../devtools" }
ethcore-ipc = { path = "../ipc/rpc" }
rocksdb = { git = "https://github.com/ethcore/rust-rocksdb" }
semver = "0.5"
ethcore-ipc-nano = { path = "../ipc/nano" }
nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
crossbeam = "0.2"
ethcore-util = { path = "../util" }
[features]
dev = ["clippy"]

38
db/build.rs
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
extern crate ethcore_ipc_codegen as codegen;
use std::env;
use std::path::Path;
pub fn main() {
let out_dir = env::var_os("OUT_DIR").unwrap();
// ipc pass
{
let src = Path::new("src/lib.rs.in");
let dst = Path::new(&out_dir).join("lib.intermediate.rs.in");
codegen::expand(&src, &dst);
}
// binary serialization pass
{
let src = Path::new(&out_dir).join("lib.intermediate.rs.in");
let dst = Path::new(&out_dir).join("lib.rs");
codegen::expand(&src, &dst);
}
}

565
db/src/database.rs
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@ -1,565 +0,0 @@
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Ethcore rocksdb ipc service
use traits::*;
use rocksdb::{DB, Writable, WriteBatch, IteratorMode, DBIterator, IndexType, Options, DBCompactionStyle, BlockBasedOptions, Direction};
use std::sync::{RwLock, Arc};
use std::convert::From;
use ipc::IpcConfig;
use std::mem;
use ipc::binary::BinaryConvertError;
use std::collections::{VecDeque, HashMap, BTreeMap};
enum WriteCacheEntry {
Remove,
Write(Vec<u8>),
}
pub struct WriteCache {
entries: HashMap<Vec<u8>, WriteCacheEntry>,
preferred_len: usize,
}
const FLUSH_BATCH_SIZE: usize = 4096;
impl WriteCache {
fn new(cache_len: usize) -> WriteCache {
WriteCache {
entries: HashMap::new(),
preferred_len: cache_len,
}
}
fn write(&mut self, key: Vec<u8>, val: Vec<u8>) {
self.entries.insert(key, WriteCacheEntry::Write(val));
}
fn remove(&mut self, key: Vec<u8>) {
self.entries.insert(key, WriteCacheEntry::Remove);
}
fn get(&self, key: &[u8]) -> Option<Vec<u8>> {
self.entries.get(key).and_then(
|vec_ref| match vec_ref {
&WriteCacheEntry::Write(ref val) => Some(val.clone()),
&WriteCacheEntry::Remove => None
})
}
/// WriteCache should be locked for this
fn flush(&mut self, db: &DB, amount: usize) -> Result<(), Error> {
let batch = WriteBatch::new();
let mut removed_so_far = 0;
while removed_so_far < amount {
if self.entries.len() == 0 { break; }
let removed_key = {
let (key, cache_entry) = self.entries.iter().nth(0)
.expect("if entries.len == 0, we should have break in the loop, still we got here somehow");
match *cache_entry {
WriteCacheEntry::Write(ref val) => {
batch.put(&key, val)?;
},
WriteCacheEntry::Remove => {
batch.delete(&key)?;
},
}
key.clone()
};
self.entries.remove(&removed_key);
removed_so_far = removed_so_far + 1;
}
if removed_so_far > 0 {
db.write(batch)?;
}
Ok(())
}
/// flushes until cache is empty
fn flush_all(&mut self, db: &DB) -> Result<(), Error> {
while !self.is_empty() { self.flush(db, FLUSH_BATCH_SIZE)?; }
Ok(())
}
fn is_empty(&self) -> bool {
self.entries.is_empty()
}
fn try_shrink(&mut self, db: &DB) -> Result<(), Error> {
if self.entries.len() > self.preferred_len {
self.flush(db, FLUSH_BATCH_SIZE)?;
}
Ok(())
}
}
pub struct Database {
db: RwLock<Option<DB>>,
/// Iterators - dont't use between threads!
iterators: RwLock<BTreeMap<IteratorHandle, DBIterator>>,
write_cache: RwLock<WriteCache>,
}
unsafe impl Send for Database {}
unsafe impl Sync for Database {}
impl Database {
pub fn new() -> Database {
Database {
db: RwLock::new(None),
iterators: RwLock::new(BTreeMap::new()),
write_cache: RwLock::new(WriteCache::new(DEFAULT_CACHE_LEN)),
}
}
pub fn flush(&self) -> Result<(), Error> {
let mut cache_lock = self.write_cache.write();
let db_lock = self.db.read();
if db_lock.is_none() { return Ok(()); }
let db = db_lock.as_ref().unwrap();
cache_lock.try_shrink(&db)?;
Ok(())
}
pub fn flush_all(&self) -> Result<(), Error> {
let mut cache_lock = self.write_cache.write();
let db_lock = self.db.read();
if db_lock.is_none() { return Ok(()); }
let db = db_lock.as_ref().expect("we should have exited with Ok(()) on the previous step");
cache_lock.flush_all(&db)?;
Ok(())
}
}
impl Drop for Database {
fn drop(&mut self) {
self.flush().unwrap();
}
}
#[ipc]
impl DatabaseService for Database {
fn open(&self, config: DatabaseConfig, path: String) -> Result<(), Error> {
let mut db = self.db.write();
if db.is_some() { return Err(Error::AlreadyOpen); }
let mut opts = Options::new();
opts.set_max_open_files(256);
opts.create_if_missing(true);
opts.set_use_fsync(false);
opts.set_compaction_style(DBCompactionStyle::DBUniversalCompaction);
if let Some(size) = config.prefix_size {
let mut block_opts = BlockBasedOptions::new();
block_opts.set_index_type(IndexType::HashSearch);
opts.set_block_based_table_factory(&block_opts);
opts.set_prefix_extractor_fixed_size(size);
}
*db = Some(DB::open(&opts, &path)?);
Ok(())
}
/// Opens database in the specified path with the default config
fn open_default(&self, path: String) -> Result<(), Error> {
self.open(DatabaseConfig::default(), path)
}
fn close(&self) -> Result<(), Error> {
self.flush_all()?;
let mut db = self.db.write();
if db.is_none() { return Err(Error::IsClosed); }
*db = None;
Ok(())
}
fn put(&self, key: &[u8], value: &[u8]) -> Result<(), Error> {
let mut cache_lock = self.write_cache.write();
cache_lock.write(key.to_vec(), value.to_vec());
Ok(())
}
fn delete(&self, key: &[u8]) -> Result<(), Error> {
let mut cache_lock = self.write_cache.write();
cache_lock.remove(key.to_vec());
Ok(())
}
fn write(&self, transaction: DBTransaction) -> Result<(), Error> {
let mut cache_lock = self.write_cache.write();
let mut writes = transaction.writes.borrow_mut();
for kv in writes.drain(..) {
cache_lock.write(kv.key, kv.value);
}
let mut removes = transaction.removes.borrow_mut();
for k in removes.drain(..) {
cache_lock.remove(k);
}
Ok(())
}
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>, Error> {
{
let key_vec = key.to_vec();
let cache_hit = self.write_cache.read().get(&key_vec);
if cache_hit.is_some() {
return Ok(Some(cache_hit.expect("cache_hit.is_some() = true, still there is none somehow here")))
}
}
let db_lock = self.db.read();
let db = db_lock.as_ref().ok_or(Error::IsClosed)?;
match db.get(key)? {
Some(db_vec) => {
Ok(Some(db_vec.to_vec()))
},
None => Ok(None),
}
}
fn get_by_prefix(&self, prefix: &[u8]) -> Result<Option<Vec<u8>>, Error> {
let db_lock = self.db.read();
let db = db_lock.as_ref().ok_or(Error::IsClosed)?;
let mut iter = db.iterator(IteratorMode::From(prefix, Direction::Forward));
match iter.next() {
// TODO: use prefix_same_as_start read option (not availabele in C API currently)
Some((k, v)) => if k[0 .. prefix.len()] == prefix[..] { Ok(Some(v.to_vec())) } else { Ok(None) },
_ => Ok(None)
}
}
fn is_empty(&self) -> Result<bool, Error> {
let db_lock = self.db.read();
let db = db_lock.as_ref().ok_or(Error::IsClosed)?;
Ok(db.iterator(IteratorMode::Start).next().is_none())
}
fn iter(&self) -> Result<IteratorHandle, Error> {
let db_lock = self.db.read();
let db = db_lock.as_ref().ok_or(Error::IsClosed)?;
let mut iterators = self.iterators.write();
let next_iterator = iterators.keys().last().unwrap_or(&0) + 1;
iterators.insert(next_iterator, db.iterator(IteratorMode::Start));
Ok(next_iterator)
}
fn iter_next(&self, handle: IteratorHandle) -> Option<KeyValue> {
let mut iterators = self.iterators.write();
let mut iterator = match iterators.get_mut(&handle) {
Some(some_iterator) => some_iterator,
None => { return None; },
};
iterator.next().and_then(|(some_key, some_val)| {
Some(KeyValue {
key: some_key.to_vec(),
value: some_val.to_vec(),
})
})
}
fn dispose_iter(&self, handle: IteratorHandle) -> Result<(), Error> {
let mut iterators = self.iterators.write();
iterators.remove(&handle);
Ok(())
}
}
// TODO : put proper at compile-time
impl IpcConfig for Database {}
/// Database iterator
pub struct DatabaseIterator {
client: Arc<DatabaseClient<::nanomsg::Socket>>,
handle: IteratorHandle,
}
impl Iterator for DatabaseIterator {
type Item = (Vec<u8>, Vec<u8>);
fn next(&mut self) -> Option<Self::Item> {
self.client.iter_next(self.handle).and_then(|kv| Some((kv.key, kv.value)))
}
}
impl Drop for DatabaseIterator {
fn drop(&mut self) {
self.client.dispose_iter(self.handle).unwrap();
}
}
#[cfg(test)]
mod test {
use super::Database;
use traits::*;
use devtools::*;
#[test]
fn can_be_created() {
let db = Database::new();
assert!(db.is_empty().is_err());
}
#[test]
fn can_be_open_empty() {
let db = Database::new();
let path = RandomTempPath::create_dir();
db.open_default(path.as_str().to_owned()).unwrap();
assert!(db.is_empty().is_ok());
}
#[test]
fn can_store_key() {
let db = Database::new();
let path = RandomTempPath::create_dir();
db.open_default(path.as_str().to_owned()).unwrap();
db.put("xxx".as_bytes(), "1".as_bytes()).unwrap();
db.flush_all().unwrap();
assert!(!db.is_empty().unwrap());
}
#[test]
fn can_retrieve() {
let db = Database::new();
let path = RandomTempPath::create_dir();
db.open_default(path.as_str().to_owned()).unwrap();
db.put("xxx".as_bytes(), "1".as_bytes()).unwrap();
db.close().unwrap();
db.open_default(path.as_str().to_owned()).unwrap();
assert_eq!(db.get("xxx".as_bytes()).unwrap().unwrap(), "1".as_bytes().to_vec());
}
}
#[cfg(test)]
mod write_cache_tests {
use super::Database;
use traits::*;
use devtools::*;
#[test]
fn cache_write_flush() {
let db = Database::new();
let path = RandomTempPath::create_dir();
db.open_default(path.as_str().to_owned()).unwrap();
db.put("100500".as_bytes(), "1".as_bytes()).unwrap();
db.delete("100500".as_bytes()).unwrap();
db.flush_all().unwrap();
let val = db.get("100500".as_bytes()).unwrap();
assert!(val.is_none());
}
}
#[cfg(test)]
mod client_tests {
use super::{DatabaseClient, Database};
use traits::*;
use devtools::*;
use nanoipc;
use std::sync::Arc;
use std::sync::atomic::{Ordering, AtomicBool};
use crossbeam;
use run_worker;
fn init_worker(addr: &str) -> nanoipc::Worker<Database> {
let mut worker = nanoipc::Worker::<Database>::new(&Arc::new(Database::new()));
worker.add_duplex(addr).unwrap();
worker
}
#[test]
fn can_call_handshake() {
let url = "ipc:///tmp/parity-db-ipc-test-10.ipc";
let worker_should_exit = Arc::new(AtomicBool::new(false));
let worker_is_ready = Arc::new(AtomicBool::new(false));
let c_worker_should_exit = worker_should_exit.clone();
let c_worker_is_ready = worker_is_ready.clone();
::std::thread::spawn(move || {
let mut worker = init_worker(url);
while !c_worker_should_exit.load(Ordering::Relaxed) {
worker.poll();
c_worker_is_ready.store(true, Ordering::Relaxed);
}
});
while !worker_is_ready.load(Ordering::Relaxed) { }
let client = nanoipc::init_duplex_client::<DatabaseClient<_>>(url).unwrap();
let hs = client.handshake();
worker_should_exit.store(true, Ordering::Relaxed);
assert!(hs.is_ok());
}
#[test]
fn can_open_db() {
let url = "ipc:///tmp/parity-db-ipc-test-20.ipc";
let path = RandomTempPath::create_dir();
let worker_should_exit = Arc::new(AtomicBool::new(false));
let worker_is_ready = Arc::new(AtomicBool::new(false));
let c_worker_should_exit = worker_should_exit.clone();
let c_worker_is_ready = worker_is_ready.clone();
::std::thread::spawn(move || {
let mut worker = init_worker(url);
while !c_worker_should_exit.load(Ordering::Relaxed) {
worker.poll();
c_worker_is_ready.store(true, Ordering::Relaxed);
}
});
while !worker_is_ready.load(Ordering::Relaxed) { }
let client = nanoipc::init_duplex_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
assert!(client.is_empty().unwrap());
worker_should_exit.store(true, Ordering::Relaxed);
}
#[test]
fn can_put() {
let url = "ipc:///tmp/parity-db-ipc-test-30.ipc";
let path = RandomTempPath::create_dir();
crossbeam::scope(move |scope| {
let stop = Arc::new(AtomicBool::new(false));
run_worker(scope, stop.clone(), url);
let client = nanoipc::generic_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
client.put("xxx".as_bytes(), "1".as_bytes()).unwrap();
client.close().unwrap();
stop.store(true, Ordering::Relaxed);
});
}
#[test]
fn can_put_and_read() {
let url = "ipc:///tmp/parity-db-ipc-test-40.ipc";
let path = RandomTempPath::create_dir();
crossbeam::scope(move |scope| {
let stop = Arc::new(AtomicBool::new(false));
run_worker(scope, stop.clone(), url);
let client = nanoipc::generic_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
client.put("xxx".as_bytes(), "1".as_bytes()).unwrap();
client.close().unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
assert_eq!(client.get("xxx".as_bytes()).unwrap().unwrap(), "1".as_bytes().to_vec());
stop.store(true, Ordering::Relaxed);
});
}
#[test]
fn can_read_empty() {
let url = "ipc:///tmp/parity-db-ipc-test-45.ipc";
let path = RandomTempPath::create_dir();
crossbeam::scope(move |scope| {
let stop = Arc::new(AtomicBool::new(false));
run_worker(scope, stop.clone(), url);
let client = nanoipc::generic_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
assert!(client.get("xxx".as_bytes()).unwrap().is_none());
stop.store(true, Ordering::Relaxed);
});
}
#[test]
fn can_commit_client_transaction() {
let url = "ipc:///tmp/parity-db-ipc-test-60.ipc";
let path = RandomTempPath::create_dir();
crossbeam::scope(move |scope| {
let stop = Arc::new(AtomicBool::new(false));
run_worker(scope, stop.clone(), url);
let client = nanoipc::generic_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
let transaction = DBTransaction::new();
transaction.put("xxx".as_bytes(), "1".as_bytes());
client.write(transaction).unwrap();
client.close().unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
assert_eq!(client.get("xxx".as_bytes()).unwrap().unwrap(), "1".as_bytes().to_vec());
stop.store(true, Ordering::Relaxed);
});
}
#[test]
fn key_write_read_ipc() {
let url = "ipc:///tmp/parity-db-ipc-test-70.ipc";
let path = RandomTempPath::create_dir();
crossbeam::scope(|scope| {
let stop = StopGuard::new();
run_worker(&scope, stop.share(), url);
let client = nanoipc::generic_client::<DatabaseClient<_>>(url).unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
let mut batch = Vec::new();
for _ in 0..100 {
batch.push((random_str(256).as_bytes().to_vec(), random_str(256).as_bytes().to_vec()));
batch.push((random_str(256).as_bytes().to_vec(), random_str(2048).as_bytes().to_vec()));
batch.push((random_str(2048).as_bytes().to_vec(), random_str(2048).as_bytes().to_vec()));
batch.push((random_str(2048).as_bytes().to_vec(), random_str(256).as_bytes().to_vec()));
}
for &(ref k, ref v) in batch.iter() {
client.put(k, v).unwrap();
}
client.close().unwrap();
client.open_default(path.as_str().to_owned()).unwrap();
for &(ref k, ref v) in batch.iter() {
assert_eq!(v, &client.get(k).unwrap().unwrap());
}
});
}
}

20
db/src/lib.rs
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Database ipc service
#![allow(dead_code, unused_assignments, unused_variables)] // codegen issues
include!(concat!(env!("OUT_DIR"), "/lib.rs"));

89
db/src/lib.rs.in
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
extern crate ethcore_ipc as ipc;
extern crate rocksdb;
extern crate ethcore_devtools as devtools;
extern crate semver;
extern crate ethcore_ipc_nano as nanoipc;
extern crate nanomsg;
extern crate crossbeam;
extern crate ethcore_util as util;
pub mod database;
pub mod traits;
pub use traits::{DatabaseService, DBTransaction, Error};
pub use database::{Database, DatabaseClient, DatabaseIterator};
use std::sync::Arc;
use std::sync::atomic::*;
use std::path::PathBuf;
pub type DatabaseNanoClient = DatabaseClient<::nanomsg::Socket>;
pub type DatabaseConnection = nanoipc::GuardedSocket<DatabaseNanoClient>;
#[derive(Debug)]
pub enum ServiceError {
Io(std::io::Error),
Socket(nanoipc::SocketError),
}
impl std::convert::From<std::io::Error> for ServiceError {
fn from(io_error: std::io::Error) -> ServiceError { ServiceError::Io(io_error) }
}
impl std::convert::From<nanoipc::SocketError> for ServiceError {
fn from(socket_error: nanoipc::SocketError) -> ServiceError { ServiceError::Socket(socket_error) }
}
pub fn blocks_service_url(db_path: &str) -> Result<String, std::io::Error> {
let mut path = PathBuf::from(db_path);
::std::fs::create_dir_all(db_path)?;
path.push("blocks.ipc");
Ok(format!("ipc://{}", path.to_str().unwrap()))
}
pub fn extras_service_url(db_path: &str) -> Result<String, ::std::io::Error> {
let mut path = PathBuf::from(db_path);
::std::fs::create_dir_all(db_path)?;
path.push("extras.ipc");
Ok(format!("ipc://{}", path.to_str().unwrap()))
}
pub fn blocks_client(db_path: &str) -> Result<DatabaseConnection, ServiceError> {
let url = blocks_service_url(db_path)?;
let client = nanoipc::generic_client::<DatabaseClient<_>>(&url)?;
Ok(client)
}
pub fn extras_client(db_path: &str) -> Result<DatabaseConnection, ServiceError> {
let url = extras_service_url(db_path)?;
let client = nanoipc::generic_client::<DatabaseClient<_>>(&url)?;
Ok(client)
}
// for tests
pub fn run_worker(scope: &crossbeam::Scope, stop: Arc<AtomicBool>, socket_path: &str) {
let socket_path = socket_path.to_owned();
scope.spawn(move || {
let mut worker = nanoipc::Worker::new(&Arc::new(Database::new()));
worker.add_reqrep(&socket_path).unwrap();
while !stop.load(Ordering::Relaxed) {
worker.poll();
}
});
}

135
db/src/traits.rs
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@ -1,135 +0,0 @@
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Ethcore database trait
use std::cell::RefCell;
pub type IteratorHandle = u32;
pub const DEFAULT_CACHE_LEN: usize = 12288;
#[derive(Binary)]
pub struct KeyValue {
pub key: Vec<u8>,
pub value: Vec<u8>,
}
#[derive(Debug, Binary)]
pub enum Error {
AlreadyOpen,
IsClosed,
RocksDb(String),
TransactionUnknown,
IteratorUnknown,
UncommitedTransactions,
}
impl From<String> for Error {
fn from(s: String) -> Error {
Error::RocksDb(s)
}
}
/// Database configuration
#[derive(Binary)]
pub struct DatabaseConfig {
/// Optional prefix size in bytes. Allows lookup by partial key.
pub prefix_size: Option<usize>,
/// write cache length
pub cache: usize,
}
impl Default for DatabaseConfig {
fn default() -> DatabaseConfig {
DatabaseConfig {
prefix_size: None,
cache: DEFAULT_CACHE_LEN,
}
}
}
impl DatabaseConfig {
fn with_prefix(prefix: usize) -> DatabaseConfig {
DatabaseConfig {
prefix_size: Some(prefix),
cache: DEFAULT_CACHE_LEN,
}
}
}
pub trait DatabaseService : Sized {
/// Opens database in the specified path
fn open(&self, config: DatabaseConfig, path: String) -> Result<(), Error>;
/// Opens database in the specified path with the default config
fn open_default(&self, path: String) -> Result<(), Error>;
/// Closes database
fn close(&self) -> Result<(), Error>;
/// Insert a key-value pair in the transaction. Any existing value value will be overwritten.
fn put(&self, key: &[u8], value: &[u8]) -> Result<(), Error>;
/// Delete value by key.
fn delete(&self, key: &[u8]) -> Result<(), Error>;
/// Get value by key.
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>, Error>;
/// Get value by partial key. Prefix size should match configured prefix size.
fn get_by_prefix(&self, prefix: &[u8]) -> Result<Option<Vec<u8>>, Error>;
/// Check if there is anything in the database.
fn is_empty(&self) -> Result<bool, Error>;
/// Get handle to iterate through keys
fn iter(&self) -> Result<IteratorHandle, Error>;
/// Next key-value for the the given iterator
fn iter_next(&self, iterator: IteratorHandle) -> Option<KeyValue>;
/// Dispose iteration that is no longer needed
fn dispose_iter(&self, handle: IteratorHandle) -> Result<(), Error>;
/// Write client transaction
fn write(&self, transaction: DBTransaction) -> Result<(), Error>;
}
#[derive(Binary)]
pub struct DBTransaction {
pub writes: RefCell<Vec<KeyValue>>,
pub removes: RefCell<Vec<Vec<u8>>>,
}
impl DBTransaction {
pub fn new() -> DBTransaction {
DBTransaction {
writes: RefCell::new(Vec::new()),
removes: RefCell::new(Vec::new()),
}
}
pub fn put(&self, key: &[u8], value: &[u8]) {
let mut brw = self.writes.borrow_mut();
brw.push(KeyValue { key: key.to_vec(), value: value.to_vec() });
}
pub fn delete(&self, key: &[u8]) {
let mut brw = self.removes.borrow_mut();
brw.push(key.to_vec());
}
}