227 lines
7.9 KiB
Python
227 lines
7.9 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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)
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logg = logging.getLogger(__name__)
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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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match_state = self.sync_state.NEW
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if started:
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match_state = self.sync_state.SYNC
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v = self.sync_state.get(self.state_key)
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self.cursor = int.from_bytes(v, 'big')
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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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else:
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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 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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self.filter_state.set(self.state_key, self.filter_state.from_name('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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raise FilterDone()
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if interrupt:
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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
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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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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.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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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.register = self.filter_state.register
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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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self.session_id = os.path.basename(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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logg.info('added {}'.format(o))
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fp = os.path.join(self.session_path, str(target))
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if len(thresholds) == 0:
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logg.info('syncer first run')
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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=0):
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self.__load(target)
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if self.first:
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block_number = offset
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block_number_bytes = block_number.to_bytes(4, 'big')
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block_number_str = str(block_number)
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self.state.put(block_number_str, block_number_bytes)
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self.filter_state.put(block_number_str)
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o = SyncFsItem(block_number, target, self.state, self.filter_state)
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self.items[block_number] = o
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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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def stop(self):
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if self.target == 0:
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block_number = self.height + 1
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block_number_bytes = block_number.to_bytes(4, 'big')
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self.state.put(str(block_number), block_number_bytes)
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def get(self, k):
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return self.items[k]
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