314 lines
10 KiB
Python
314 lines
10 KiB
Python
# standard imports
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import uuid
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import os
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import logging
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# external imports
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from shep.store.file import SimpleFileStoreFactory
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from shep.persist import PersistedState
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from shep.error import StateInvalid
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# local imports
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from chainsyncer.state import SyncState
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from chainsyncer.error import (
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LockError,
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FilterDone,
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InterruptError,
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IncompleteFilterError,
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SyncDone,
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)
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logg = logging.getLogger(__name__)
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def sync_state_serialize(block_height, tx_index, block_target):
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b = block_height.to_bytes(4, 'big')
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b += tx_index.to_bytes(4, 'big')
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b += block_target.to_bytes(4, 'big', signed=True)
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return b
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def sync_state_deserialize(b):
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block_height = int.from_bytes(b[:4], 'big')
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tx_index = int.from_bytes(b[4:8], 'big')
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block_target = int.from_bytes(b[8:], 'big', signed=True)
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return (block_height, tx_index, block_target,)
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# NOT thread safe
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class SyncFsItem:
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def __init__(self, offset, target, sync_state, filter_state, started=False, ignore_invalid=False):
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self.offset = offset
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self.target = target
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self.sync_state = sync_state
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self.filter_state = filter_state
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self.state_key = str(offset)
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logg.debug('get key {}'.format(self.state_key))
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v = self.sync_state.get(self.state_key)
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(self.cursor, self.tx_cursor, self.target) = sync_state_deserialize(v)
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('LOCK') and not ignore_invalid:
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raise LockError(s)
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self.count = len(self.filter_state.all(pure=True)) - 3
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self.skip_filter = False
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if self.count == 0:
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self.skip_filter = True
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elif not started:
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self.filter_state.move(self.state_key, self.filter_state.from_name('RESET'))
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def __check_done(self):
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('INTERRUPT') > 0:
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raise InterruptError(self.state_key)
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('DONE') > 0:
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raise FilterDone(self.state_key)
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def reset(self):
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('LOCK') > 0:
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raise LockError('reset attempt on {} when state locked'.format(self.state_key))
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('DONE') == 0:
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raise IncompleteFilterError('reset attempt on {} when incomplete'.format(self.state_key))
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self.filter_state.move(self.state_key, self.filter_state.from_name('RESET'))
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def next(self, advance_block=False):
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v = self.sync_state.state(self.state_key)
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if v == self.sync_state.DONE:
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raise SyncDone(self.target)
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v = self.sync_state.get(self.state_key)
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(block_number, tx_index, target) = sync_state_deserialize(v)
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if advance_block:
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block_number += 1
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tx_index = 0
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if self.target >= 0 and block_number > self.target:
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self.sync_state.move(self.state_key, self.sync_state.DONE)
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raise SyncDone(self.target)
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else:
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tx_index += 1
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self.cursor = block_number
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self.tx_cursor = tx_index
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b = sync_state_serialize(block_number, tx_index, target)
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self.sync_state.replace(self.state_key, b)
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def __find_advance(self):
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v = self.filter_state.state(self.state_key)
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def advance(self):
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if self.skip_filter:
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raise FilterDone()
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self.__check_done()
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if self.filter_state.state(self.state_key) & self.filter_state.from_name('LOCK') > 0:
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raise LockError('advance attempt on {} when state locked'.format(self.state_key))
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done = False
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try:
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self.filter_state.next(self.state_key)
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except StateInvalid:
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done = True
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if done:
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raise FilterDone()
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self.filter_state.set(self.state_key, self.filter_state.from_name('LOCK'))
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def release(self, interrupt=False):
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if self.skip_filter:
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return False
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if interrupt:
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self.filter_state.unset(self.state_key, self.filter_state.from_name('LOCK'))
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self.filter_state.set(self.state_key, self.filter_state.from_name('INTERRUPT'))
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self.filter_state.set(self.state_key, self.filter_state.from_name('DONE'))
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return False
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state = self.filter_state.state(self.state_key)
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if state & self.filter_state.from_name('LOCK') == 0:
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raise LockError('release attempt on {} when state unlocked'.format(self.state_key))
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self.filter_state.unset(self.state_key, self.filter_state.from_name('LOCK'))
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try:
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c = self.filter_state.peek(self.state_key)
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logg.debug('peeked {}'.format(c))
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except StateInvalid:
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self.filter_state.set(self.state_key, self.filter_state.from_name('DONE'))
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return False
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return True
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def __str__(self):
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return 'syncitem offset {} target {} cursor {}'.format(self.offset, self.target, self.cursor)
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class SyncFsStore:
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def __init__(self, base_path, session_id=None):
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self.session_id = None
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self.session_path = None
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self.is_default = False
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self.first = False
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self.target = None
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self.items = {}
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self.item_keys = []
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self.started = False
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default_path = os.path.join(base_path, 'default')
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if session_id == None:
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self.session_path = os.path.realpath(default_path)
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self.is_default = True
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else:
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if session_id == 'default':
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self.is_default = True
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given_path = os.path.join(base_path, session_id)
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self.session_path = os.path.realpath(given_path)
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create_path = False
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try:
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os.stat(self.session_path)
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except FileNotFoundError:
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create_path = True
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if create_path:
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self.__create_path(base_path, default_path, session_id=session_id)
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self.session_id = os.path.basename(self.session_path)
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logg.info('session id {} resolved {} path {}'.format(session_id, self.session_id, self.session_path))
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factory = SimpleFileStoreFactory(self.session_path, binary=True)
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self.state = PersistedState(factory.add, 2)
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self.state.add('SYNC')
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self.state.add('DONE')
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base_filter_path = os.path.join(self.session_path, 'filter')
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factory = SimpleFileStoreFactory(base_filter_path, binary=True)
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filter_state_backend = PersistedState(factory.add, 0, check_alias=False)
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self.filter_state = SyncState(filter_state_backend)
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self.filters = [] # used by SyncSession
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def register(self, fltr):
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self.filters.append(fltr)
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self.filter_state.register(fltr)
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def __create_path(self, base_path, default_path, session_id=None):
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logg.debug('fs store path {} does not exist, creating'.format(self.session_path))
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if session_id == None:
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session_id = str(uuid.uuid4())
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self.session_path = os.path.join(base_path, session_id)
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os.makedirs(self.session_path)
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if self.is_default:
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try:
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os.symlink(self.session_path, default_path)
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except FileExistsError:
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pass
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def __load(self, target):
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self.state.sync(self.state.NEW)
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self.state.sync(self.state.SYNC)
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thresholds_sync = []
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for v in self.state.list(self.state.SYNC):
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block_number = int(v)
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thresholds_sync.append(block_number)
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logg.debug('queue resume {}'.format(block_number))
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thresholds_new = []
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for v in self.state.list(self.state.NEW):
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block_number = int(v)
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thresholds_new.append(block_number)
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logg.debug('queue new range {}'.format(block_number))
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thresholds_sync.sort()
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thresholds_new.sort()
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thresholds = thresholds_sync + thresholds_new
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lim = len(thresholds) - 1
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for i in range(len(thresholds)):
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item_target = target
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if i < lim:
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item_target = thresholds[i+1]
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o = SyncFsItem(block_number, item_target, self.state, self.filter_state, started=True)
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self.items[block_number] = o
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self.item_keys.append(block_number)
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logg.info('added existing {}'.format(o))
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fp = os.path.join(self.session_path, 'target')
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if len(thresholds) == 0:
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logg.info('syncer first run target {}'.format(target))
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self.first = True
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f = open(fp, 'w')
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f.write(str(target))
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f.close()
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f = open(fp, 'r')
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v = f.read()
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f.close()
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self.target = int(v)
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def start(self, offset=0, target=-1):
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if self.started:
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return
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self.__load(target)
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if self.first:
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state_bytes = sync_state_serialize(offset, 0, target)
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block_number_str = str(offset)
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self.state.put(block_number_str, state_bytes)
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self.filter_state.put(block_number_str)
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o = SyncFsItem(offset, target, self.state, self.filter_state)
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self.items[offset] = o
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self.item_keys.append(offset)
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elif offset > 0:
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logg.warning('block number argument {} for start ignored for already initiated sync {}'.format(offset, self.session_id))
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self.started = True
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self.item_keys.sort()
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def stop(self, item):
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if item.target == -1:
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state_bytes = sync_state_serialize(item.cursor, 0, item.cursor)
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self.state.replace(str(item.offset), state_bytes)
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self.filter_state.put(str(item.cursor))
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SyncFsItem(item.offset, -1, self.state, self.filter_state)
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logg.info('New sync state start at block number {} for next head sync backfill'.format(item.cursor))
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self.state.move(item.state_key, self.state.DONE)
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state_bytes = sync_state_serialize(item.cursor, 0, -1)
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self.state.put(str(item.cursor), state_bytes)
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logg.debug('item {}'.format(self.state.state(item.state_key)))
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def get(self, k):
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return self.items[k]
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def next_item(self):
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try:
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k = self.item_keys.pop(0)
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except IndexError:
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return None
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return self.items[k]
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def connect(self):
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self.filter_state.connect()
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def disconnect(self):
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self.filter_state.disconnect()
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