1649 lines
58 KiB
Python
1649 lines
58 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import itertools
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import logging
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import sys
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import threading
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import time
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from six import PY2, iteritems, iterkeys, itervalues
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from six.moves import builtins, intern, range
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from canonicaljson import json
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from prometheus_client import Histogram
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from twisted.internet import defer
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from synapse.api.errors import StoreError
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.storage.engines import PostgresEngine, Sqlite3Engine
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from synapse.types import get_domain_from_id
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from synapse.util import batch_iter
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from synapse.util.caches.descriptors import Cache
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from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
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from synapse.util.stringutils import exception_to_unicode
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logger = logging.getLogger(__name__)
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try:
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MAX_TXN_ID = sys.maxint - 1
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except AttributeError:
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# python 3 does not have a maximum int value
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MAX_TXN_ID = 2**63 - 1
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sql_logger = logging.getLogger("synapse.storage.SQL")
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transaction_logger = logging.getLogger("synapse.storage.txn")
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perf_logger = logging.getLogger("synapse.storage.TIME")
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sql_scheduling_timer = Histogram("synapse_storage_schedule_time", "sec")
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sql_query_timer = Histogram("synapse_storage_query_time", "sec", ["verb"])
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sql_txn_timer = Histogram("synapse_storage_transaction_time", "sec", ["desc"])
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# Unique indexes which have been added in background updates. Maps from table name
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# to the name of the background update which added the unique index to that table.
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#
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# This is used by the upsert logic to figure out which tables are safe to do a proper
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# UPSERT on: until the relevant background update has completed, we
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# have to emulate an upsert by locking the table.
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#
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UNIQUE_INDEX_BACKGROUND_UPDATES = {
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"user_ips": "user_ips_device_unique_index",
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"device_lists_remote_extremeties": "device_lists_remote_extremeties_unique_idx",
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"device_lists_remote_cache": "device_lists_remote_cache_unique_idx",
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"event_search": "event_search_event_id_idx",
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}
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# This is a special cache name we use to batch multiple invalidations of caches
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# based on the current state when notifying workers over replication.
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_CURRENT_STATE_CACHE_NAME = "cs_cache_fake"
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class LoggingTransaction(object):
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"""An object that almost-transparently proxies for the 'txn' object
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passed to the constructor. Adds logging and metrics to the .execute()
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method."""
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__slots__ = [
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"txn", "name", "database_engine", "after_callbacks", "exception_callbacks",
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]
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def __init__(self, txn, name, database_engine, after_callbacks,
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exception_callbacks):
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object.__setattr__(self, "txn", txn)
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object.__setattr__(self, "name", name)
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object.__setattr__(self, "database_engine", database_engine)
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object.__setattr__(self, "after_callbacks", after_callbacks)
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object.__setattr__(self, "exception_callbacks", exception_callbacks)
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def call_after(self, callback, *args, **kwargs):
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"""Call the given callback on the main twisted thread after the
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transaction has finished. Used to invalidate the caches on the
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correct thread.
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"""
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self.after_callbacks.append((callback, args, kwargs))
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def call_on_exception(self, callback, *args, **kwargs):
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self.exception_callbacks.append((callback, args, kwargs))
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def __getattr__(self, name):
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return getattr(self.txn, name)
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def __setattr__(self, name, value):
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setattr(self.txn, name, value)
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def __iter__(self):
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return self.txn.__iter__()
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def execute_batch(self, sql, args):
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if isinstance(self.database_engine, PostgresEngine):
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from psycopg2.extras import execute_batch
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self._do_execute(lambda *x: execute_batch(self.txn, *x), sql, args)
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else:
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for val in args:
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self.execute(sql, val)
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def execute(self, sql, *args):
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self._do_execute(self.txn.execute, sql, *args)
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def executemany(self, sql, *args):
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self._do_execute(self.txn.executemany, sql, *args)
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def _make_sql_one_line(self, sql):
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"Strip newlines out of SQL so that the loggers in the DB are on one line"
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return " ".join(l.strip() for l in sql.splitlines() if l.strip())
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def _do_execute(self, func, sql, *args):
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sql = self._make_sql_one_line(sql)
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# TODO(paul): Maybe use 'info' and 'debug' for values?
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sql_logger.debug("[SQL] {%s} %s", self.name, sql)
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sql = self.database_engine.convert_param_style(sql)
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if args:
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try:
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sql_logger.debug(
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"[SQL values] {%s} %r",
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self.name, args[0]
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)
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except Exception:
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# Don't let logging failures stop SQL from working
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pass
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start = time.time()
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try:
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return func(
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sql, *args
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)
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except Exception as e:
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logger.debug("[SQL FAIL] {%s} %s", self.name, e)
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raise
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finally:
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secs = time.time() - start
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sql_logger.debug("[SQL time] {%s} %f sec", self.name, secs)
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sql_query_timer.labels(sql.split()[0]).observe(secs)
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class PerformanceCounters(object):
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def __init__(self):
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self.current_counters = {}
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self.previous_counters = {}
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def update(self, key, start_time, end_time=None):
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if end_time is None:
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end_time = time.time()
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duration = end_time - start_time
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count, cum_time = self.current_counters.get(key, (0, 0))
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count += 1
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cum_time += duration
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self.current_counters[key] = (count, cum_time)
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return end_time
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def interval(self, interval_duration, limit=3):
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counters = []
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for name, (count, cum_time) in iteritems(self.current_counters):
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prev_count, prev_time = self.previous_counters.get(name, (0, 0))
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counters.append((
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(cum_time - prev_time) / interval_duration,
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count - prev_count,
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name
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))
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self.previous_counters = dict(self.current_counters)
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counters.sort(reverse=True)
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top_n_counters = ", ".join(
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"%s(%d): %.3f%%" % (name, count, 100 * ratio)
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for ratio, count, name in counters[:limit]
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)
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return top_n_counters
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class SQLBaseStore(object):
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_TXN_ID = 0
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def __init__(self, db_conn, hs):
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self.hs = hs
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self._clock = hs.get_clock()
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self._db_pool = hs.get_db_pool()
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self._previous_txn_total_time = 0
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self._current_txn_total_time = 0
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self._previous_loop_ts = 0
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# TODO(paul): These can eventually be removed once the metrics code
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# is running in mainline, and we have some nice monitoring frontends
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# to watch it
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self._txn_perf_counters = PerformanceCounters()
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self._get_event_counters = PerformanceCounters()
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self._get_event_cache = Cache("*getEvent*", keylen=3,
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max_entries=hs.config.event_cache_size)
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self._event_fetch_lock = threading.Condition()
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self._event_fetch_list = []
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self._event_fetch_ongoing = 0
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self._pending_ds = []
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self.database_engine = hs.database_engine
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# A set of tables that are not safe to use native upserts in.
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self._unsafe_to_upsert_tables = set(UNIQUE_INDEX_BACKGROUND_UPDATES.keys())
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# We add the user_directory_search table to the blacklist on SQLite
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# because the existing search table does not have an index, making it
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# unsafe to use native upserts.
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if isinstance(self.database_engine, Sqlite3Engine):
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self._unsafe_to_upsert_tables.add("user_directory_search")
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if self.database_engine.can_native_upsert:
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# Check ASAP (and then later, every 1s) to see if we have finished
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# background updates of tables that aren't safe to update.
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self._clock.call_later(
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0.0,
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run_as_background_process,
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"upsert_safety_check",
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self._check_safe_to_upsert
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)
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@defer.inlineCallbacks
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def _check_safe_to_upsert(self):
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"""
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Is it safe to use native UPSERT?
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If there are background updates, we will need to wait, as they may be
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the addition of indexes that set the UNIQUE constraint that we require.
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If the background updates have not completed, wait 15 sec and check again.
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"""
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updates = yield self._simple_select_list(
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"background_updates",
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keyvalues=None,
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retcols=["update_name"],
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desc="check_background_updates",
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)
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updates = [x["update_name"] for x in updates]
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for table, update_name in UNIQUE_INDEX_BACKGROUND_UPDATES.items():
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if update_name not in updates:
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logger.debug("Now safe to upsert in %s", table)
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self._unsafe_to_upsert_tables.discard(table)
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# If there's any updates still running, reschedule to run.
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if updates:
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self._clock.call_later(
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15.0,
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run_as_background_process,
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"upsert_safety_check",
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self._check_safe_to_upsert
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)
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def start_profiling(self):
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self._previous_loop_ts = self._clock.time_msec()
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def loop():
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curr = self._current_txn_total_time
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prev = self._previous_txn_total_time
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self._previous_txn_total_time = curr
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time_now = self._clock.time_msec()
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time_then = self._previous_loop_ts
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self._previous_loop_ts = time_now
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ratio = (curr - prev) / (time_now - time_then)
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top_three_counters = self._txn_perf_counters.interval(
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time_now - time_then, limit=3
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)
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top_3_event_counters = self._get_event_counters.interval(
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time_now - time_then, limit=3
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)
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perf_logger.info(
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"Total database time: %.3f%% {%s} {%s}",
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ratio * 100, top_three_counters, top_3_event_counters
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)
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self._clock.looping_call(loop, 10000)
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def _new_transaction(self, conn, desc, after_callbacks, exception_callbacks,
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func, *args, **kwargs):
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start = time.time()
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txn_id = self._TXN_ID
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# We don't really need these to be unique, so lets stop it from
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# growing really large.
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self._TXN_ID = (self._TXN_ID + 1) % (MAX_TXN_ID)
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name = "%s-%x" % (desc, txn_id, )
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transaction_logger.debug("[TXN START] {%s}", name)
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try:
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i = 0
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N = 5
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while True:
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try:
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txn = conn.cursor()
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txn = LoggingTransaction(
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txn, name, self.database_engine, after_callbacks,
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exception_callbacks,
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)
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r = func(txn, *args, **kwargs)
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conn.commit()
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return r
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except self.database_engine.module.OperationalError as e:
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# This can happen if the database disappears mid
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# transaction.
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logger.warning(
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"[TXN OPERROR] {%s} %s %d/%d",
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name, exception_to_unicode(e), i, N
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)
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if i < N:
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i += 1
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try:
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conn.rollback()
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except self.database_engine.module.Error as e1:
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logger.warning(
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"[TXN EROLL] {%s} %s",
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name, exception_to_unicode(e1),
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)
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continue
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raise
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except self.database_engine.module.DatabaseError as e:
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if self.database_engine.is_deadlock(e):
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logger.warning("[TXN DEADLOCK] {%s} %d/%d", name, i, N)
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if i < N:
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i += 1
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try:
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conn.rollback()
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except self.database_engine.module.Error as e1:
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logger.warning(
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"[TXN EROLL] {%s} %s",
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name, exception_to_unicode(e1),
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)
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continue
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raise
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except Exception as e:
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logger.debug("[TXN FAIL] {%s} %s", name, e)
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raise
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finally:
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end = time.time()
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duration = end - start
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LoggingContext.current_context().add_database_transaction(duration)
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transaction_logger.debug("[TXN END] {%s} %f sec", name, duration)
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self._current_txn_total_time += duration
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self._txn_perf_counters.update(desc, start, end)
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sql_txn_timer.labels(desc).observe(duration)
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@defer.inlineCallbacks
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def runInteraction(self, desc, func, *args, **kwargs):
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"""Starts a transaction on the database and runs a given function
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Arguments:
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desc (str): description of the transaction, for logging and metrics
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func (func): callback function, which will be called with a
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database transaction (twisted.enterprise.adbapi.Transaction) as
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its first argument, followed by `args` and `kwargs`.
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args (list): positional args to pass to `func`
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kwargs (dict): named args to pass to `func`
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Returns:
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Deferred: The result of func
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"""
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after_callbacks = []
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exception_callbacks = []
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if LoggingContext.current_context() == LoggingContext.sentinel:
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logger.warn(
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"Starting db txn '%s' from sentinel context",
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desc,
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)
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try:
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result = yield self.runWithConnection(
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self._new_transaction,
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desc, after_callbacks, exception_callbacks, func,
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*args, **kwargs
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)
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for after_callback, after_args, after_kwargs in after_callbacks:
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after_callback(*after_args, **after_kwargs)
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except: # noqa: E722, as we reraise the exception this is fine.
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for after_callback, after_args, after_kwargs in exception_callbacks:
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after_callback(*after_args, **after_kwargs)
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raise
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defer.returnValue(result)
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@defer.inlineCallbacks
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def runWithConnection(self, func, *args, **kwargs):
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"""Wraps the .runWithConnection() method on the underlying db_pool.
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|
Arguments:
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func (func): callback function, which will be called with a
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database connection (twisted.enterprise.adbapi.Connection) as
|
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its first argument, followed by `args` and `kwargs`.
|
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args (list): positional args to pass to `func`
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kwargs (dict): named args to pass to `func`
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Returns:
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Deferred: The result of func
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"""
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parent_context = LoggingContext.current_context()
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if parent_context == LoggingContext.sentinel:
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logger.warn(
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"Starting db connection from sentinel context: metrics will be lost",
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)
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parent_context = None
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|
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start_time = time.time()
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|
|
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def inner_func(conn, *args, **kwargs):
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with LoggingContext("runWithConnection", parent_context) as context:
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sched_duration_sec = time.time() - start_time
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sql_scheduling_timer.observe(sched_duration_sec)
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context.add_database_scheduled(sched_duration_sec)
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|
|
|
if self.database_engine.is_connection_closed(conn):
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logger.debug("Reconnecting closed database connection")
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conn.reconnect()
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|
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return func(conn, *args, **kwargs)
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|
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with PreserveLoggingContext():
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result = yield self._db_pool.runWithConnection(
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inner_func, *args, **kwargs
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)
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defer.returnValue(result)
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|
|
|
@staticmethod
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|
def cursor_to_dict(cursor):
|
|
"""Converts a SQL cursor into an list of dicts.
|
|
|
|
Args:
|
|
cursor : The DBAPI cursor which has executed a query.
|
|
Returns:
|
|
A list of dicts where the key is the column header.
|
|
"""
|
|
col_headers = list(intern(str(column[0])) for column in cursor.description)
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|
results = list(
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dict(zip(col_headers, row)) for row in cursor
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)
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return results
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|
|
|
def _execute(self, desc, decoder, query, *args):
|
|
"""Runs a single query for a result set.
|
|
|
|
Args:
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decoder - The function which can resolve the cursor results to
|
|
something meaningful.
|
|
query - The query string to execute
|
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*args - Query args.
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|
Returns:
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The result of decoder(results)
|
|
"""
|
|
def interaction(txn):
|
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txn.execute(query, args)
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if decoder:
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return decoder(txn)
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|
else:
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return txn.fetchall()
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|
|
|
return self.runInteraction(desc, interaction)
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|
|
|
# "Simple" SQL API methods that operate on a single table with no JOINs,
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# no complex WHERE clauses, just a dict of values for columns.
|
|
|
|
@defer.inlineCallbacks
|
|
def _simple_insert(self, table, values, or_ignore=False,
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desc="_simple_insert"):
|
|
"""Executes an INSERT query on the named table.
|
|
|
|
Args:
|
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table : string giving the table name
|
|
values : dict of new column names and values for them
|
|
|
|
Returns:
|
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bool: Whether the row was inserted or not. Only useful when
|
|
`or_ignore` is True
|
|
"""
|
|
try:
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|
yield self.runInteraction(
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desc,
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self._simple_insert_txn, table, values,
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)
|
|
except self.database_engine.module.IntegrityError:
|
|
# We have to do or_ignore flag at this layer, since we can't reuse
|
|
# a cursor after we receive an error from the db.
|
|
if not or_ignore:
|
|
raise
|
|
defer.returnValue(False)
|
|
defer.returnValue(True)
|
|
|
|
@staticmethod
|
|
def _simple_insert_txn(txn, table, values):
|
|
keys, vals = zip(*values.items())
|
|
|
|
sql = "INSERT INTO %s (%s) VALUES(%s)" % (
|
|
table,
|
|
", ".join(k for k in keys),
|
|
", ".join("?" for _ in keys)
|
|
)
|
|
|
|
txn.execute(sql, vals)
|
|
|
|
def _simple_insert_many(self, table, values, desc):
|
|
return self.runInteraction(
|
|
desc, self._simple_insert_many_txn, table, values
|
|
)
|
|
|
|
@staticmethod
|
|
def _simple_insert_many_txn(txn, table, values):
|
|
if not values:
|
|
return
|
|
|
|
# This is a *slight* abomination to get a list of tuples of key names
|
|
# and a list of tuples of value names.
|
|
#
|
|
# i.e. [{"a": 1, "b": 2}, {"c": 3, "d": 4}]
|
|
# => [("a", "b",), ("c", "d",)] and [(1, 2,), (3, 4,)]
|
|
#
|
|
# The sort is to ensure that we don't rely on dictionary iteration
|
|
# order.
|
|
keys, vals = zip(*[
|
|
zip(
|
|
*(sorted(i.items(), key=lambda kv: kv[0]))
|
|
)
|
|
for i in values
|
|
if i
|
|
])
|
|
|
|
for k in keys:
|
|
if k != keys[0]:
|
|
raise RuntimeError(
|
|
"All items must have the same keys"
|
|
)
|
|
|
|
sql = "INSERT INTO %s (%s) VALUES(%s)" % (
|
|
table,
|
|
", ".join(k for k in keys[0]),
|
|
", ".join("?" for _ in keys[0])
|
|
)
|
|
|
|
txn.executemany(sql, vals)
|
|
|
|
@defer.inlineCallbacks
|
|
def _simple_upsert(
|
|
self,
|
|
table,
|
|
keyvalues,
|
|
values,
|
|
insertion_values={},
|
|
desc="_simple_upsert",
|
|
lock=True
|
|
):
|
|
"""
|
|
|
|
`lock` should generally be set to True (the default), but can be set
|
|
to False if either of the following are true:
|
|
|
|
* there is a UNIQUE INDEX on the key columns. In this case a conflict
|
|
will cause an IntegrityError in which case this function will retry
|
|
the update.
|
|
|
|
* we somehow know that we are the only thread which will be updating
|
|
this table.
|
|
|
|
Args:
|
|
table (str): The table to upsert into
|
|
keyvalues (dict): The unique key tables and their new values
|
|
values (dict): The nonunique columns and their new values
|
|
insertion_values (dict): additional key/values to use only when
|
|
inserting
|
|
lock (bool): True to lock the table when doing the upsert.
|
|
Returns:
|
|
Deferred(None or bool): Native upserts always return None. Emulated
|
|
upserts return True if a new entry was created, False if an existing
|
|
one was updated.
|
|
"""
|
|
attempts = 0
|
|
while True:
|
|
try:
|
|
result = yield self.runInteraction(
|
|
desc,
|
|
self._simple_upsert_txn,
|
|
table,
|
|
keyvalues,
|
|
values,
|
|
insertion_values,
|
|
lock=lock,
|
|
)
|
|
defer.returnValue(result)
|
|
except self.database_engine.module.IntegrityError as e:
|
|
attempts += 1
|
|
if attempts >= 5:
|
|
# don't retry forever, because things other than races
|
|
# can cause IntegrityErrors
|
|
raise
|
|
|
|
# presumably we raced with another transaction: let's retry.
|
|
logger.warn(
|
|
"%s when upserting into %s; retrying: %s", e.__name__, table, e
|
|
)
|
|
|
|
def _simple_upsert_txn(
|
|
self,
|
|
txn,
|
|
table,
|
|
keyvalues,
|
|
values,
|
|
insertion_values={},
|
|
lock=True,
|
|
):
|
|
"""
|
|
Pick the UPSERT method which works best on the platform. Either the
|
|
native one (Pg9.5+, recent SQLites), or fall back to an emulated method.
|
|
|
|
Args:
|
|
txn: The transaction to use.
|
|
table (str): The table to upsert into
|
|
keyvalues (dict): The unique key tables and their new values
|
|
values (dict): The nonunique columns and their new values
|
|
insertion_values (dict): additional key/values to use only when
|
|
inserting
|
|
lock (bool): True to lock the table when doing the upsert.
|
|
Returns:
|
|
None or bool: Native upserts always return None. Emulated
|
|
upserts return True if a new entry was created, False if an existing
|
|
one was updated.
|
|
"""
|
|
if (
|
|
self.database_engine.can_native_upsert
|
|
and table not in self._unsafe_to_upsert_tables
|
|
):
|
|
return self._simple_upsert_txn_native_upsert(
|
|
txn,
|
|
table,
|
|
keyvalues,
|
|
values,
|
|
insertion_values=insertion_values,
|
|
)
|
|
else:
|
|
return self._simple_upsert_txn_emulated(
|
|
txn,
|
|
table,
|
|
keyvalues,
|
|
values,
|
|
insertion_values=insertion_values,
|
|
lock=lock,
|
|
)
|
|
|
|
def _simple_upsert_txn_emulated(
|
|
self, txn, table, keyvalues, values, insertion_values={}, lock=True
|
|
):
|
|
"""
|
|
Args:
|
|
table (str): The table to upsert into
|
|
keyvalues (dict): The unique key tables and their new values
|
|
values (dict): The nonunique columns and their new values
|
|
insertion_values (dict): additional key/values to use only when
|
|
inserting
|
|
lock (bool): True to lock the table when doing the upsert.
|
|
Returns:
|
|
bool: Return True if a new entry was created, False if an existing
|
|
one was updated.
|
|
"""
|
|
# We need to lock the table :(, unless we're *really* careful
|
|
if lock:
|
|
self.database_engine.lock_table(txn, table)
|
|
|
|
def _getwhere(key):
|
|
# If the value we're passing in is None (aka NULL), we need to use
|
|
# IS, not =, as NULL = NULL equals NULL (False).
|
|
if keyvalues[key] is None:
|
|
return "%s IS ?" % (key,)
|
|
else:
|
|
return "%s = ?" % (key,)
|
|
|
|
if not values:
|
|
# If `values` is empty, then all of the values we care about are in
|
|
# the unique key, so there is nothing to UPDATE. We can just do a
|
|
# SELECT instead to see if it exists.
|
|
sql = "SELECT 1 FROM %s WHERE %s" % (
|
|
table,
|
|
" AND ".join(_getwhere(k) for k in keyvalues)
|
|
)
|
|
sqlargs = list(keyvalues.values())
|
|
txn.execute(sql, sqlargs)
|
|
if txn.fetchall():
|
|
# We have an existing record.
|
|
return False
|
|
else:
|
|
# First try to update.
|
|
sql = "UPDATE %s SET %s WHERE %s" % (
|
|
table,
|
|
", ".join("%s = ?" % (k,) for k in values),
|
|
" AND ".join(_getwhere(k) for k in keyvalues)
|
|
)
|
|
sqlargs = list(values.values()) + list(keyvalues.values())
|
|
|
|
txn.execute(sql, sqlargs)
|
|
if txn.rowcount > 0:
|
|
# successfully updated at least one row.
|
|
return False
|
|
|
|
# We didn't find any existing rows, so insert a new one
|
|
allvalues = {}
|
|
allvalues.update(keyvalues)
|
|
allvalues.update(values)
|
|
allvalues.update(insertion_values)
|
|
|
|
sql = "INSERT INTO %s (%s) VALUES (%s)" % (
|
|
table,
|
|
", ".join(k for k in allvalues),
|
|
", ".join("?" for _ in allvalues),
|
|
)
|
|
txn.execute(sql, list(allvalues.values()))
|
|
# successfully inserted
|
|
return True
|
|
|
|
def _simple_upsert_txn_native_upsert(
|
|
self, txn, table, keyvalues, values, insertion_values={}
|
|
):
|
|
"""
|
|
Use the native UPSERT functionality in recent PostgreSQL versions.
|
|
|
|
Args:
|
|
table (str): The table to upsert into
|
|
keyvalues (dict): The unique key tables and their new values
|
|
values (dict): The nonunique columns and their new values
|
|
insertion_values (dict): additional key/values to use only when
|
|
inserting
|
|
Returns:
|
|
None
|
|
"""
|
|
allvalues = {}
|
|
allvalues.update(keyvalues)
|
|
allvalues.update(values)
|
|
allvalues.update(insertion_values)
|
|
|
|
sql = (
|
|
"INSERT INTO %s (%s) VALUES (%s) "
|
|
"ON CONFLICT (%s) DO UPDATE SET %s"
|
|
) % (
|
|
table,
|
|
", ".join(k for k in allvalues),
|
|
", ".join("?" for _ in allvalues),
|
|
", ".join(k for k in keyvalues),
|
|
", ".join(k + "=EXCLUDED." + k for k in values),
|
|
)
|
|
txn.execute(sql, list(allvalues.values()))
|
|
|
|
def _simple_upsert_many_txn(
|
|
self, txn, table, key_names, key_values, value_names, value_values
|
|
):
|
|
"""
|
|
Upsert, many times.
|
|
|
|
Args:
|
|
table (str): The table to upsert into
|
|
key_names (list[str]): The key column names.
|
|
key_values (list[list]): A list of each row's key column values.
|
|
value_names (list[str]): The value column names. If empty, no
|
|
values will be used, even if value_values is provided.
|
|
value_values (list[list]): A list of each row's value column values.
|
|
Returns:
|
|
None
|
|
"""
|
|
if (
|
|
self.database_engine.can_native_upsert
|
|
and table not in self._unsafe_to_upsert_tables
|
|
):
|
|
return self._simple_upsert_many_txn_native_upsert(
|
|
txn, table, key_names, key_values, value_names, value_values
|
|
)
|
|
else:
|
|
return self._simple_upsert_many_txn_emulated(
|
|
txn, table, key_names, key_values, value_names, value_values
|
|
)
|
|
|
|
def _simple_upsert_many_txn_emulated(
|
|
self, txn, table, key_names, key_values, value_names, value_values
|
|
):
|
|
"""
|
|
Upsert, many times, but without native UPSERT support or batching.
|
|
|
|
Args:
|
|
table (str): The table to upsert into
|
|
key_names (list[str]): The key column names.
|
|
key_values (list[list]): A list of each row's key column values.
|
|
value_names (list[str]): The value column names. If empty, no
|
|
values will be used, even if value_values is provided.
|
|
value_values (list[list]): A list of each row's value column values.
|
|
Returns:
|
|
None
|
|
"""
|
|
# No value columns, therefore make a blank list so that the following
|
|
# zip() works correctly.
|
|
if not value_names:
|
|
value_values = [() for x in range(len(key_values))]
|
|
|
|
for keyv, valv in zip(key_values, value_values):
|
|
_keys = {x: y for x, y in zip(key_names, keyv)}
|
|
_vals = {x: y for x, y in zip(value_names, valv)}
|
|
|
|
self._simple_upsert_txn_emulated(txn, table, _keys, _vals)
|
|
|
|
def _simple_upsert_many_txn_native_upsert(
|
|
self, txn, table, key_names, key_values, value_names, value_values
|
|
):
|
|
"""
|
|
Upsert, many times, using batching where possible.
|
|
|
|
Args:
|
|
table (str): The table to upsert into
|
|
key_names (list[str]): The key column names.
|
|
key_values (list[list]): A list of each row's key column values.
|
|
value_names (list[str]): The value column names. If empty, no
|
|
values will be used, even if value_values is provided.
|
|
value_values (list[list]): A list of each row's value column values.
|
|
Returns:
|
|
None
|
|
"""
|
|
allnames = []
|
|
allnames.extend(key_names)
|
|
allnames.extend(value_names)
|
|
|
|
if not value_names:
|
|
# No value columns, therefore make a blank list so that the
|
|
# following zip() works correctly.
|
|
latter = "NOTHING"
|
|
value_values = [() for x in range(len(key_values))]
|
|
else:
|
|
latter = (
|
|
"UPDATE SET " + ", ".join(k + "=EXCLUDED." + k for k in value_names)
|
|
)
|
|
|
|
sql = "INSERT INTO %s (%s) VALUES (%s) ON CONFLICT (%s) DO %s" % (
|
|
table,
|
|
", ".join(k for k in allnames),
|
|
", ".join("?" for _ in allnames),
|
|
", ".join(key_names),
|
|
latter,
|
|
)
|
|
|
|
args = []
|
|
|
|
for x, y in zip(key_values, value_values):
|
|
args.append(tuple(x) + tuple(y))
|
|
|
|
return txn.execute_batch(sql, args)
|
|
|
|
def _simple_select_one(self, table, keyvalues, retcols,
|
|
allow_none=False, desc="_simple_select_one"):
|
|
"""Executes a SELECT query on the named table, which is expected to
|
|
return a single row, returning multiple columns from it.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
keyvalues : dict of column names and values to select the row with
|
|
retcols : list of strings giving the names of the columns to return
|
|
|
|
allow_none : If true, return None instead of failing if the SELECT
|
|
statement returns no rows
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_select_one_txn,
|
|
table, keyvalues, retcols, allow_none,
|
|
)
|
|
|
|
def _simple_select_one_onecol(self, table, keyvalues, retcol,
|
|
allow_none=False,
|
|
desc="_simple_select_one_onecol"):
|
|
"""Executes a SELECT query on the named table, which is expected to
|
|
return a single row, returning a single column from it.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
keyvalues : dict of column names and values to select the row with
|
|
retcol : string giving the name of the column to return
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_select_one_onecol_txn,
|
|
table, keyvalues, retcol, allow_none=allow_none,
|
|
)
|
|
|
|
@classmethod
|
|
def _simple_select_one_onecol_txn(cls, txn, table, keyvalues, retcol,
|
|
allow_none=False):
|
|
ret = cls._simple_select_onecol_txn(
|
|
txn,
|
|
table=table,
|
|
keyvalues=keyvalues,
|
|
retcol=retcol,
|
|
)
|
|
|
|
if ret:
|
|
return ret[0]
|
|
else:
|
|
if allow_none:
|
|
return None
|
|
else:
|
|
raise StoreError(404, "No row found")
|
|
|
|
@staticmethod
|
|
def _simple_select_onecol_txn(txn, table, keyvalues, retcol):
|
|
sql = (
|
|
"SELECT %(retcol)s FROM %(table)s"
|
|
) % {
|
|
"retcol": retcol,
|
|
"table": table,
|
|
}
|
|
|
|
if keyvalues:
|
|
sql += " WHERE %s" % " AND ".join("%s = ?" % k for k in iterkeys(keyvalues))
|
|
txn.execute(sql, list(keyvalues.values()))
|
|
else:
|
|
txn.execute(sql)
|
|
|
|
return [r[0] for r in txn]
|
|
|
|
def _simple_select_onecol(self, table, keyvalues, retcol,
|
|
desc="_simple_select_onecol"):
|
|
"""Executes a SELECT query on the named table, which returns a list
|
|
comprising of the values of the named column from the selected rows.
|
|
|
|
Args:
|
|
table (str): table name
|
|
keyvalues (dict|None): column names and values to select the rows with
|
|
retcol (str): column whos value we wish to retrieve.
|
|
|
|
Returns:
|
|
Deferred: Results in a list
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_select_onecol_txn,
|
|
table, keyvalues, retcol
|
|
)
|
|
|
|
def _simple_select_list(self, table, keyvalues, retcols,
|
|
desc="_simple_select_list"):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Args:
|
|
table (str): the table name
|
|
keyvalues (dict[str, Any] | None):
|
|
column names and values to select the rows with, or None to not
|
|
apply a WHERE clause.
|
|
retcols (iterable[str]): the names of the columns to return
|
|
Returns:
|
|
defer.Deferred: resolves to list[dict[str, Any]]
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_select_list_txn,
|
|
table, keyvalues, retcols
|
|
)
|
|
|
|
@classmethod
|
|
def _simple_select_list_txn(cls, txn, table, keyvalues, retcols):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
table (str): the table name
|
|
keyvalues (dict[str, T] | None):
|
|
column names and values to select the rows with, or None to not
|
|
apply a WHERE clause.
|
|
retcols (iterable[str]): the names of the columns to return
|
|
"""
|
|
if keyvalues:
|
|
sql = "SELECT %s FROM %s WHERE %s" % (
|
|
", ".join(retcols),
|
|
table,
|
|
" AND ".join("%s = ?" % (k, ) for k in keyvalues)
|
|
)
|
|
txn.execute(sql, list(keyvalues.values()))
|
|
else:
|
|
sql = "SELECT %s FROM %s" % (
|
|
", ".join(retcols),
|
|
table
|
|
)
|
|
txn.execute(sql)
|
|
|
|
return cls.cursor_to_dict(txn)
|
|
|
|
@defer.inlineCallbacks
|
|
def _simple_select_many_batch(self, table, column, iterable, retcols,
|
|
keyvalues={}, desc="_simple_select_many_batch",
|
|
batch_size=100):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Filters rows by if value of `column` is in `iterable`.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
column : column name to test for inclusion against `iterable`
|
|
iterable : list
|
|
keyvalues : dict of column names and values to select the rows with
|
|
retcols : list of strings giving the names of the columns to return
|
|
"""
|
|
results = []
|
|
|
|
if not iterable:
|
|
defer.returnValue(results)
|
|
|
|
# iterables can not be sliced, so convert it to a list first
|
|
it_list = list(iterable)
|
|
|
|
chunks = [
|
|
it_list[i:i + batch_size]
|
|
for i in range(0, len(it_list), batch_size)
|
|
]
|
|
for chunk in chunks:
|
|
rows = yield self.runInteraction(
|
|
desc,
|
|
self._simple_select_many_txn,
|
|
table, column, chunk, keyvalues, retcols
|
|
)
|
|
|
|
results.extend(rows)
|
|
|
|
defer.returnValue(results)
|
|
|
|
@classmethod
|
|
def _simple_select_many_txn(cls, txn, table, column, iterable, keyvalues, retcols):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Filters rows by if value of `column` is in `iterable`.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
table : string giving the table name
|
|
column : column name to test for inclusion against `iterable`
|
|
iterable : list
|
|
keyvalues : dict of column names and values to select the rows with
|
|
retcols : list of strings giving the names of the columns to return
|
|
"""
|
|
if not iterable:
|
|
return []
|
|
|
|
sql = "SELECT %s FROM %s" % (", ".join(retcols), table)
|
|
|
|
clauses = []
|
|
values = []
|
|
clauses.append(
|
|
"%s IN (%s)" % (column, ",".join("?" for _ in iterable))
|
|
)
|
|
values.extend(iterable)
|
|
|
|
for key, value in iteritems(keyvalues):
|
|
clauses.append("%s = ?" % (key,))
|
|
values.append(value)
|
|
|
|
if clauses:
|
|
sql = "%s WHERE %s" % (
|
|
sql,
|
|
" AND ".join(clauses),
|
|
)
|
|
|
|
txn.execute(sql, values)
|
|
return cls.cursor_to_dict(txn)
|
|
|
|
def _simple_update(self, table, keyvalues, updatevalues, desc):
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_update_txn,
|
|
table, keyvalues, updatevalues,
|
|
)
|
|
|
|
@staticmethod
|
|
def _simple_update_txn(txn, table, keyvalues, updatevalues):
|
|
if keyvalues:
|
|
where = "WHERE %s" % " AND ".join("%s = ?" % k for k in iterkeys(keyvalues))
|
|
else:
|
|
where = ""
|
|
|
|
update_sql = "UPDATE %s SET %s %s" % (
|
|
table,
|
|
", ".join("%s = ?" % (k,) for k in updatevalues),
|
|
where,
|
|
)
|
|
|
|
txn.execute(
|
|
update_sql,
|
|
list(updatevalues.values()) + list(keyvalues.values())
|
|
)
|
|
|
|
return txn.rowcount
|
|
|
|
def _simple_update_one(self, table, keyvalues, updatevalues,
|
|
desc="_simple_update_one"):
|
|
"""Executes an UPDATE query on the named table, setting new values for
|
|
columns in a row matching the key values.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
keyvalues : dict of column names and values to select the row with
|
|
updatevalues : dict giving column names and values to update
|
|
retcols : optional list of column names to return
|
|
|
|
If present, retcols gives a list of column names on which to perform
|
|
a SELECT statement *before* performing the UPDATE statement. The values
|
|
of these will be returned in a dict.
|
|
|
|
These are performed within the same transaction, allowing an atomic
|
|
get-and-set. This can be used to implement compare-and-set by putting
|
|
the update column in the 'keyvalues' dict as well.
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_update_one_txn,
|
|
table, keyvalues, updatevalues,
|
|
)
|
|
|
|
@classmethod
|
|
def _simple_update_one_txn(cls, txn, table, keyvalues, updatevalues):
|
|
rowcount = cls._simple_update_txn(txn, table, keyvalues, updatevalues)
|
|
|
|
if rowcount == 0:
|
|
raise StoreError(404, "No row found (%s)" % (table,))
|
|
if rowcount > 1:
|
|
raise StoreError(500, "More than one row matched (%s)" % (table,))
|
|
|
|
@staticmethod
|
|
def _simple_select_one_txn(txn, table, keyvalues, retcols,
|
|
allow_none=False):
|
|
select_sql = "SELECT %s FROM %s WHERE %s" % (
|
|
", ".join(retcols),
|
|
table,
|
|
" AND ".join("%s = ?" % (k,) for k in keyvalues)
|
|
)
|
|
|
|
txn.execute(select_sql, list(keyvalues.values()))
|
|
|
|
row = txn.fetchone()
|
|
if not row:
|
|
if allow_none:
|
|
return None
|
|
raise StoreError(404, "No row found (%s)" % (table,))
|
|
if txn.rowcount > 1:
|
|
raise StoreError(500, "More than one row matched (%s)" % (table,))
|
|
|
|
return dict(zip(retcols, row))
|
|
|
|
def _simple_delete_one(self, table, keyvalues, desc="_simple_delete_one"):
|
|
"""Executes a DELETE query on the named table, expecting to delete a
|
|
single row.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
keyvalues : dict of column names and values to select the row with
|
|
"""
|
|
return self.runInteraction(
|
|
desc, self._simple_delete_one_txn, table, keyvalues
|
|
)
|
|
|
|
@staticmethod
|
|
def _simple_delete_one_txn(txn, table, keyvalues):
|
|
"""Executes a DELETE query on the named table, expecting to delete a
|
|
single row.
|
|
|
|
Args:
|
|
table : string giving the table name
|
|
keyvalues : dict of column names and values to select the row with
|
|
"""
|
|
sql = "DELETE FROM %s WHERE %s" % (
|
|
table,
|
|
" AND ".join("%s = ?" % (k, ) for k in keyvalues)
|
|
)
|
|
|
|
txn.execute(sql, list(keyvalues.values()))
|
|
if txn.rowcount == 0:
|
|
raise StoreError(404, "No row found (%s)" % (table,))
|
|
if txn.rowcount > 1:
|
|
raise StoreError(500, "More than one row matched (%s)" % (table,))
|
|
|
|
def _simple_delete(self, table, keyvalues, desc):
|
|
return self.runInteraction(
|
|
desc, self._simple_delete_txn, table, keyvalues
|
|
)
|
|
|
|
@staticmethod
|
|
def _simple_delete_txn(txn, table, keyvalues):
|
|
sql = "DELETE FROM %s WHERE %s" % (
|
|
table,
|
|
" AND ".join("%s = ?" % (k, ) for k in keyvalues)
|
|
)
|
|
|
|
return txn.execute(sql, list(keyvalues.values()))
|
|
|
|
def _simple_delete_many(self, table, column, iterable, keyvalues, desc):
|
|
return self.runInteraction(
|
|
desc, self._simple_delete_many_txn, table, column, iterable, keyvalues
|
|
)
|
|
|
|
@staticmethod
|
|
def _simple_delete_many_txn(txn, table, column, iterable, keyvalues):
|
|
"""Executes a DELETE query on the named table.
|
|
|
|
Filters rows by if value of `column` is in `iterable`.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
table : string giving the table name
|
|
column : column name to test for inclusion against `iterable`
|
|
iterable : list
|
|
keyvalues : dict of column names and values to select the rows with
|
|
"""
|
|
if not iterable:
|
|
return
|
|
|
|
sql = "DELETE FROM %s" % table
|
|
|
|
clauses = []
|
|
values = []
|
|
clauses.append(
|
|
"%s IN (%s)" % (column, ",".join("?" for _ in iterable))
|
|
)
|
|
values.extend(iterable)
|
|
|
|
for key, value in iteritems(keyvalues):
|
|
clauses.append("%s = ?" % (key,))
|
|
values.append(value)
|
|
|
|
if clauses:
|
|
sql = "%s WHERE %s" % (
|
|
sql,
|
|
" AND ".join(clauses),
|
|
)
|
|
return txn.execute(sql, values)
|
|
|
|
def _get_cache_dict(self, db_conn, table, entity_column, stream_column,
|
|
max_value, limit=100000):
|
|
# Fetch a mapping of room_id -> max stream position for "recent" rooms.
|
|
# It doesn't really matter how many we get, the StreamChangeCache will
|
|
# do the right thing to ensure it respects the max size of cache.
|
|
sql = (
|
|
"SELECT %(entity)s, MAX(%(stream)s) FROM %(table)s"
|
|
" WHERE %(stream)s > ? - %(limit)s"
|
|
" GROUP BY %(entity)s"
|
|
) % {
|
|
"table": table,
|
|
"entity": entity_column,
|
|
"stream": stream_column,
|
|
"limit": limit,
|
|
}
|
|
|
|
sql = self.database_engine.convert_param_style(sql)
|
|
|
|
txn = db_conn.cursor()
|
|
txn.execute(sql, (int(max_value),))
|
|
|
|
cache = {
|
|
row[0]: int(row[1])
|
|
for row in txn
|
|
}
|
|
|
|
txn.close()
|
|
|
|
if cache:
|
|
min_val = min(itervalues(cache))
|
|
else:
|
|
min_val = max_value
|
|
|
|
return cache, min_val
|
|
|
|
def _invalidate_cache_and_stream(self, txn, cache_func, keys):
|
|
"""Invalidates the cache and adds it to the cache stream so slaves
|
|
will know to invalidate their caches.
|
|
|
|
This should only be used to invalidate caches where slaves won't
|
|
otherwise know from other replication streams that the cache should
|
|
be invalidated.
|
|
"""
|
|
txn.call_after(cache_func.invalidate, keys)
|
|
self._send_invalidation_to_replication(txn, cache_func.__name__, keys)
|
|
|
|
def _invalidate_state_caches_and_stream(self, txn, room_id, members_changed):
|
|
"""Special case invalidation of caches based on current state.
|
|
|
|
We special case this so that we can batch the cache invalidations into a
|
|
single replication poke.
|
|
|
|
Args:
|
|
txn
|
|
room_id (str): Room where state changed
|
|
members_changed (iterable[str]): The user_ids of members that have changed
|
|
"""
|
|
txn.call_after(self._invalidate_state_caches, room_id, members_changed)
|
|
|
|
# We need to be careful that the size of the `members_changed` list
|
|
# isn't so large that it causes problems sending over replication, so we
|
|
# send them in chunks.
|
|
# Max line length is 16K, and max user ID length is 255, so 50 should
|
|
# be safe.
|
|
for chunk in batch_iter(members_changed, 50):
|
|
keys = itertools.chain([room_id], chunk)
|
|
self._send_invalidation_to_replication(
|
|
txn, _CURRENT_STATE_CACHE_NAME, keys,
|
|
)
|
|
|
|
def _invalidate_state_caches(self, room_id, members_changed):
|
|
"""Invalidates caches that are based on the current state, but does
|
|
not stream invalidations down replication.
|
|
|
|
Args:
|
|
room_id (str): Room where state changed
|
|
members_changed (iterable[str]): The user_ids of members that have
|
|
changed
|
|
"""
|
|
for member in members_changed:
|
|
self._attempt_to_invalidate_cache(
|
|
"get_rooms_for_user_with_stream_ordering", (member,),
|
|
)
|
|
|
|
for host in set(get_domain_from_id(u) for u in members_changed):
|
|
self._attempt_to_invalidate_cache(
|
|
"is_host_joined", (room_id, host,),
|
|
)
|
|
self._attempt_to_invalidate_cache(
|
|
"was_host_joined", (room_id, host,),
|
|
)
|
|
|
|
self._attempt_to_invalidate_cache(
|
|
"get_users_in_room", (room_id,),
|
|
)
|
|
self._attempt_to_invalidate_cache(
|
|
"get_room_summary", (room_id,),
|
|
)
|
|
self._attempt_to_invalidate_cache(
|
|
"get_current_state_ids", (room_id,),
|
|
)
|
|
|
|
def _attempt_to_invalidate_cache(self, cache_name, key):
|
|
"""Attempts to invalidate the cache of the given name, ignoring if the
|
|
cache doesn't exist. Mainly used for invalidating caches on workers,
|
|
where they may not have the cache.
|
|
|
|
Args:
|
|
cache_name (str)
|
|
key (tuple)
|
|
"""
|
|
try:
|
|
getattr(self, cache_name).invalidate(key)
|
|
except AttributeError:
|
|
# We probably haven't pulled in the cache in this worker,
|
|
# which is fine.
|
|
pass
|
|
|
|
def _send_invalidation_to_replication(self, txn, cache_name, keys):
|
|
"""Notifies replication that given cache has been invalidated.
|
|
|
|
Note that this does *not* invalidate the cache locally.
|
|
|
|
Args:
|
|
txn
|
|
cache_name (str)
|
|
keys (iterable[str])
|
|
"""
|
|
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
# get_next() returns a context manager which is designed to wrap
|
|
# the transaction. However, we want to only get an ID when we want
|
|
# to use it, here, so we need to call __enter__ manually, and have
|
|
# __exit__ called after the transaction finishes.
|
|
ctx = self._cache_id_gen.get_next()
|
|
stream_id = ctx.__enter__()
|
|
txn.call_on_exception(ctx.__exit__, None, None, None)
|
|
txn.call_after(ctx.__exit__, None, None, None)
|
|
txn.call_after(self.hs.get_notifier().on_new_replication_data)
|
|
|
|
self._simple_insert_txn(
|
|
txn,
|
|
table="cache_invalidation_stream",
|
|
values={
|
|
"stream_id": stream_id,
|
|
"cache_func": cache_name,
|
|
"keys": list(keys),
|
|
"invalidation_ts": self.clock.time_msec(),
|
|
}
|
|
)
|
|
|
|
def get_all_updated_caches(self, last_id, current_id, limit):
|
|
if last_id == current_id:
|
|
return defer.succeed([])
|
|
|
|
def get_all_updated_caches_txn(txn):
|
|
# We purposefully don't bound by the current token, as we want to
|
|
# send across cache invalidations as quickly as possible. Cache
|
|
# invalidations are idempotent, so duplicates are fine.
|
|
sql = (
|
|
"SELECT stream_id, cache_func, keys, invalidation_ts"
|
|
" FROM cache_invalidation_stream"
|
|
" WHERE stream_id > ? ORDER BY stream_id ASC LIMIT ?"
|
|
)
|
|
txn.execute(sql, (last_id, limit,))
|
|
return txn.fetchall()
|
|
return self.runInteraction(
|
|
"get_all_updated_caches", get_all_updated_caches_txn
|
|
)
|
|
|
|
def get_cache_stream_token(self):
|
|
if self._cache_id_gen:
|
|
return self._cache_id_gen.get_current_token()
|
|
else:
|
|
return 0
|
|
|
|
def _simple_select_list_paginate(self, table, keyvalues, pagevalues, retcols,
|
|
desc="_simple_select_list_paginate"):
|
|
"""Executes a SELECT query on the named table with start and limit,
|
|
of row numbers, which may return zero or number of rows from start to limit,
|
|
returning the result as a list of dicts.
|
|
|
|
Args:
|
|
table (str): the table name
|
|
keyvalues (dict[str, Any] | None):
|
|
column names and values to select the rows with, or None to not
|
|
apply a WHERE clause.
|
|
retcols (iterable[str]): the names of the columns to return
|
|
order (str): order the select by this column
|
|
start (int): start number to begin the query from
|
|
limit (int): number of rows to reterive
|
|
Returns:
|
|
defer.Deferred: resolves to list[dict[str, Any]]
|
|
"""
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_select_list_paginate_txn,
|
|
table, keyvalues, pagevalues, retcols
|
|
)
|
|
|
|
@classmethod
|
|
def _simple_select_list_paginate_txn(cls, txn, table, keyvalues, pagevalues, retcols):
|
|
"""Executes a SELECT query on the named table with start and limit,
|
|
of row numbers, which may return zero or number of rows from start to limit,
|
|
returning the result as a list of dicts.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
table (str): the table name
|
|
keyvalues (dict[str, T] | None):
|
|
column names and values to select the rows with, or None to not
|
|
apply a WHERE clause.
|
|
pagevalues ([]):
|
|
order (str): order the select by this column
|
|
start (int): start number to begin the query from
|
|
limit (int): number of rows to reterive
|
|
retcols (iterable[str]): the names of the columns to return
|
|
Returns:
|
|
defer.Deferred: resolves to list[dict[str, Any]]
|
|
|
|
"""
|
|
if keyvalues:
|
|
sql = "SELECT %s FROM %s WHERE %s ORDER BY %s" % (
|
|
", ".join(retcols),
|
|
table,
|
|
" AND ".join("%s = ?" % (k,) for k in keyvalues),
|
|
" ? ASC LIMIT ? OFFSET ?"
|
|
)
|
|
txn.execute(sql, list(keyvalues.values()) + list(pagevalues))
|
|
else:
|
|
sql = "SELECT %s FROM %s ORDER BY %s" % (
|
|
", ".join(retcols),
|
|
table,
|
|
" ? ASC LIMIT ? OFFSET ?"
|
|
)
|
|
txn.execute(sql, pagevalues)
|
|
|
|
return cls.cursor_to_dict(txn)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_user_list_paginate(self, table, keyvalues, pagevalues, retcols,
|
|
desc="get_user_list_paginate"):
|
|
"""Get a list of users from start row to a limit number of rows. This will
|
|
return a json object with users and total number of users in users list.
|
|
|
|
Args:
|
|
table (str): the table name
|
|
keyvalues (dict[str, Any] | None):
|
|
column names and values to select the rows with, or None to not
|
|
apply a WHERE clause.
|
|
pagevalues ([]):
|
|
order (str): order the select by this column
|
|
start (int): start number to begin the query from
|
|
limit (int): number of rows to reterive
|
|
retcols (iterable[str]): the names of the columns to return
|
|
Returns:
|
|
defer.Deferred: resolves to json object {list[dict[str, Any]], count}
|
|
"""
|
|
users = yield self.runInteraction(
|
|
desc,
|
|
self._simple_select_list_paginate_txn,
|
|
table, keyvalues, pagevalues, retcols
|
|
)
|
|
count = yield self.runInteraction(
|
|
desc,
|
|
self.get_user_count_txn
|
|
)
|
|
retval = {
|
|
"users": users,
|
|
"total": count
|
|
}
|
|
defer.returnValue(retval)
|
|
|
|
def get_user_count_txn(self, txn):
|
|
"""Get a total number of registered users in the users list.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
Returns:
|
|
int : number of users
|
|
"""
|
|
sql_count = "SELECT COUNT(*) FROM users WHERE is_guest = 0;"
|
|
txn.execute(sql_count)
|
|
return txn.fetchone()[0]
|
|
|
|
def _simple_search_list(self, table, term, col, retcols,
|
|
desc="_simple_search_list"):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Args:
|
|
table (str): the table name
|
|
term (str | None):
|
|
term for searching the table matched to a column.
|
|
col (str): column to query term should be matched to
|
|
retcols (iterable[str]): the names of the columns to return
|
|
Returns:
|
|
defer.Deferred: resolves to list[dict[str, Any]] or None
|
|
"""
|
|
|
|
return self.runInteraction(
|
|
desc,
|
|
self._simple_search_list_txn,
|
|
table, term, col, retcols
|
|
)
|
|
|
|
@classmethod
|
|
def _simple_search_list_txn(cls, txn, table, term, col, retcols):
|
|
"""Executes a SELECT query on the named table, which may return zero or
|
|
more rows, returning the result as a list of dicts.
|
|
|
|
Args:
|
|
txn : Transaction object
|
|
table (str): the table name
|
|
term (str | None):
|
|
term for searching the table matched to a column.
|
|
col (str): column to query term should be matched to
|
|
retcols (iterable[str]): the names of the columns to return
|
|
Returns:
|
|
defer.Deferred: resolves to list[dict[str, Any]] or None
|
|
"""
|
|
if term:
|
|
sql = "SELECT %s FROM %s WHERE %s LIKE ?" % (
|
|
", ".join(retcols),
|
|
table,
|
|
col
|
|
)
|
|
termvalues = ["%%" + term + "%%"]
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|
txn.execute(sql, termvalues)
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else:
|
|
return 0
|
|
|
|
return cls.cursor_to_dict(txn)
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|
|
|
@property
|
|
def database_engine_name(self):
|
|
return self.database_engine.module.__name__
|
|
|
|
def get_server_version(self):
|
|
"""Returns a string describing the server version number"""
|
|
return self.database_engine.server_version
|
|
|
|
|
|
class _RollbackButIsFineException(Exception):
|
|
""" This exception is used to rollback a transaction without implying
|
|
something went wrong.
|
|
"""
|
|
pass
|
|
|
|
|
|
def db_to_json(db_content):
|
|
"""
|
|
Take some data from a database row and return a JSON-decoded object.
|
|
|
|
Args:
|
|
db_content (memoryview|buffer|bytes|bytearray|unicode)
|
|
"""
|
|
# psycopg2 on Python 3 returns memoryview objects, which we need to
|
|
# cast to bytes to decode
|
|
if isinstance(db_content, memoryview):
|
|
db_content = db_content.tobytes()
|
|
|
|
# psycopg2 on Python 2 returns buffer objects, which we need to cast to
|
|
# bytes to decode
|
|
if PY2 and isinstance(db_content, builtins.buffer):
|
|
db_content = bytes(db_content)
|
|
|
|
# Decode it to a Unicode string before feeding it to json.loads, so we
|
|
# consistenty get a Unicode-containing object out.
|
|
if isinstance(db_content, (bytes, bytearray)):
|
|
db_content = db_content.decode('utf8')
|
|
|
|
try:
|
|
return json.loads(db_content)
|
|
except Exception:
|
|
logging.warning("Tried to decode '%r' as JSON and failed", db_content)
|
|
raise
|