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swh/scheduler/updater/backend.py
| # Copyright (C) 2018 The Software Heritage developers | # Copyright (C) 2018 The Software Heritage developers | ||||
| # See the AUTHORS file at the top-level directory of this distribution | # See the AUTHORS file at the top-level directory of this distribution | ||||
| # License: GNU General Public License version 3, or any later version | # License: GNU General Public License version 3, or any later version | ||||
| # See top-level LICENSE file for more information | # See top-level LICENSE file for more information | ||||
| from arrow import utcnow | from arrow import utcnow | ||||
| import psycopg2.pool | import psycopg2.pool | ||||
| import psycopg2.extras | import psycopg2.extras | ||||
| from swh.scheduler.backend import DbBackend | |||||
| from swh.core.db import BaseDb | |||||
| from swh.core.db.common import db_transaction, db_transaction_generator | from swh.core.db.common import db_transaction, db_transaction_generator | ||||
| from swh.scheduler.backend import format_query | |||||
| class SchedulerUpdaterBackend: | class SchedulerUpdaterBackend: | ||||
| CONFIG_BASE_FILENAME = 'backend/scheduler-updater' | CONFIG_BASE_FILENAME = 'backend/scheduler-updater' | ||||
| # 'cache_read_limit': ('int', 1000), | # 'cache_read_limit': ('int', 1000), | ||||
| def __init__(self, db, cache_read_limit=1000, | def __init__(self, db, cache_read_limit=1000, | ||||
| min_pool_conns=1, max_pool_conns=10): | min_pool_conns=1, max_pool_conns=10): | ||||
| """ | """ | ||||
| Args: | Args: | ||||
| db_conn: either a libpq connection string, or a psycopg2 connection | db_conn: either a libpq connection string, or a psycopg2 connection | ||||
| """ | """ | ||||
| if isinstance(db, psycopg2.extensions.connection): | if isinstance(db, psycopg2.extensions.connection): | ||||
| self._pool = None | self._pool = None | ||||
| self._db = DbBackend(db) | self._db = BaseDb(db) | ||||
| else: | else: | ||||
| self._pool = psycopg2.pool.ThreadedConnectionPool( | self._pool = psycopg2.pool.ThreadedConnectionPool( | ||||
| min_pool_conns, max_pool_conns, db, | min_pool_conns, max_pool_conns, db, | ||||
| cursor_factory=psycopg2.extras.RealDictCursor, | cursor_factory=psycopg2.extras.RealDictCursor, | ||||
| ) | ) | ||||
| self._db = None | self._db = None | ||||
| self.limit = cache_read_limit | self.limit = cache_read_limit | ||||
| def get_db(self): | def get_db(self): | ||||
| if self._db: | if self._db: | ||||
| return self._db | return self._db | ||||
| return DbBackend.from_pool(self._pool) | return BaseDb.from_pool(self._pool) | ||||
| cache_put_keys = ['url', 'cnt', 'last_seen', 'origin_type'] | cache_put_keys = ['url', 'cnt', 'last_seen', 'origin_type'] | ||||
| @db_transaction() | @db_transaction() | ||||
| def cache_put(self, events, timestamp=None, db=None, cur=None): | def cache_put(self, events, timestamp=None, db=None, cur=None): | ||||
| """Write new events in the backend. | """Write new events in the backend. | ||||
| """ | """ | ||||
| if timestamp is None: | if timestamp is None: | ||||
| timestamp = utcnow() | timestamp = utcnow() | ||||
| def prepare_events(events): | def prepare_events(events): | ||||
| for e in events: | for e in events: | ||||
| event = e.get() | event = e.get() | ||||
| seen = event['last_seen'] | seen = event['last_seen'] | ||||
| if seen is None: | if seen is None: | ||||
| event['last_seen'] = timestamp | event['last_seen'] = timestamp | ||||
| yield event | yield event | ||||
| cur.execute('select swh_mktemp_cache()') | cur.execute('select swh_mktemp_cache()') | ||||
| db.copy_to(prepare_events(events), | db.copy_to(prepare_events(events, timestamp), | ||||
| 'tmp_cache', self.cache_put_keys, cursor=cur) | 'tmp_cache', self.cache_put_keys, cur=cur) | ||||
| cur.execute('select swh_cache_put()') | cur.execute('select swh_cache_put()') | ||||
| cache_read_keys = ['id', 'url', 'origin_type', 'cnt', 'first_seen', | cache_read_keys = ['id', 'url', 'origin_type', 'cnt', 'first_seen', | ||||
| 'last_seen'] | 'last_seen'] | ||||
| @db_transaction_generator() | @db_transaction_generator() | ||||
| def cache_read(self, timestamp=None, limit=None, db=None, cur=None): | def cache_read(self, timestamp=None, limit=None, db=None, cur=None): | ||||
| """Read events from the cache prior to timestamp. | """Read events from the cache prior to timestamp. | ||||
| """ | """ | ||||
| if not timestamp: | if not timestamp: | ||||
| timestamp = utcnow() | timestamp = utcnow() | ||||
| if not limit: | if not limit: | ||||
| limit = self.limit | limit = self.limit | ||||
| q = db._format_query('select {keys} from swh_cache_read(%s, %s)', | q = format_query('select {keys} from swh_cache_read(%s, %s)', | ||||
| self.cache_read_keys) | self.cache_read_keys) | ||||
| cur.execute(q, (timestamp, limit)) | cur.execute(q, (timestamp, limit)) | ||||
| for r in cur.fetchall(): | for r in cur.fetchall(): | ||||
| r['id'] = r['id'].tobytes() | r['id'] = r['id'].tobytes() | ||||
| yield r | yield r | ||||
| @db_transaction() | @db_transaction() | ||||
| def cache_remove(self, entries, db=None, cur=None): | def cache_remove(self, entries, db=None, cur=None): | ||||
| """Clean events from the cache | """Clean events from the cache | ||||
| """ | """ | ||||
| q = 'delete from cache where url in (%s)' % ( | q = 'delete from cache where url in (%s)' % ( | ||||
| ', '.join(("'%s'" % e for e in entries)), ) | ', '.join(("'%s'" % e for e in entries)), ) | ||||
| cur.execute(q) | cur.execute(q) | ||||