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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from collections import namedtuple
import six
from canonicaljson import encode_canonical_json
from twisted.internet import defer
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage._base import SQLBaseStore, db_to_json
from synapse.util.caches.expiringcache import ExpiringCache
# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
# despite being deprecated and removed in favor of memoryview
if six.PY2:
db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
logger = logging.getLogger(__name__)
_TransactionRow = namedtuple(
"_TransactionRow",
("id", "transaction_id", "destination", "ts", "response_code", "response_json"),
)
_UpdateTransactionRow = namedtuple(
"_TransactionRow", ("response_code", "response_json")
)
SENTINEL = object()
class TransactionStore(SQLBaseStore):
"""A collection of queries for handling PDUs.
"""
def __init__(self, db_conn, hs):
super(TransactionStore, self).__init__(db_conn, hs)
self._clock.looping_call(self._start_cleanup_transactions, 30 * 60 * 1000)
self._destination_retry_cache = ExpiringCache(
cache_name="get_destination_retry_timings",
clock=self._clock,
expiry_ms=5 * 60 * 1000,
)
def get_received_txn_response(self, transaction_id, origin):
"""For an incoming transaction from a given origin, check if we have
already responded to it. If so, return the response code and response
body (as a dict).
Args:
transaction_id (str)
origin(str)
Returns:
tuple: None if we have not previously responded to
this transaction or a 2-tuple of (int, dict)
"""
return self.runInteraction(
"get_received_txn_response",
self._get_received_txn_response,
transaction_id,
origin,
)
def _get_received_txn_response(self, txn, transaction_id, origin):
result = self.simple_select_one_txn(
txn,
table="received_transactions",
keyvalues={"transaction_id": transaction_id, "origin": origin},
retcols=(
"transaction_id",
"origin",
"ts",
"response_code",
"response_json",
"has_been_referenced",
),
allow_none=True,
)
if result and result["response_code"]:
return result["response_code"], db_to_json(result["response_json"])
else:
return None
def set_received_txn_response(self, transaction_id, origin, code, response_dict):
"""Persist the response we returened for an incoming transaction, and
should return for subsequent transactions with the same transaction_id
and origin.
Args:
txn
transaction_id (str)
origin (str)
code (int)
response_json (str)
"""
return self.simple_insert(
table="received_transactions",
values={
"transaction_id": transaction_id,
"origin": origin,
"response_code": code,
"response_json": db_binary_type(encode_canonical_json(response_dict)),
"ts": self._clock.time_msec(),
},
or_ignore=True,
desc="set_received_txn_response",
)
@defer.inlineCallbacks
def get_destination_retry_timings(self, destination):
"""Gets the current retry timings (if any) for a given destination.
Args:
destination (str)
Returns:
None if not retrying
Otherwise a dict for the retry scheme
"""
result = self._destination_retry_cache.get(destination, SENTINEL)
if result is not SENTINEL:
return result
result = yield self.runInteraction(
"get_destination_retry_timings",
self._get_destination_retry_timings,
destination,
)
# We don't hugely care about race conditions between getting and
# invalidating the cache, since we time out fairly quickly anyway.
self._destination_retry_cache[destination] = result
return result
def _get_destination_retry_timings(self, txn, destination):
result = self.simple_select_one_txn(
txn,
table="destinations",
keyvalues={"destination": destination},
retcols=("destination", "failure_ts", "retry_last_ts", "retry_interval"),
allow_none=True,
)
if result and result["retry_last_ts"] > 0:
return result
else:
return None
def set_destination_retry_timings(
self, destination, failure_ts, retry_last_ts, retry_interval
):
"""Sets the current retry timings for a given destination.
Both timings should be zero if retrying is no longer occuring.
Args:
destination (str)
failure_ts (int|None) - when the server started failing (ms since epoch)
retry_last_ts (int) - time of last retry attempt in unix epoch ms
retry_interval (int) - how long until next retry in ms
"""
self._destination_retry_cache.pop(destination, None)
return self.runInteraction(
"set_destination_retry_timings",
self._set_destination_retry_timings,
destination,
failure_ts,
retry_last_ts,
retry_interval,
)
def _set_destination_retry_timings(
self, txn, destination, failure_ts, retry_last_ts, retry_interval
):
if self.database_engine.can_native_upsert:
# Upsert retry time interval if retry_interval is zero (i.e. we're
# resetting it) or greater than the existing retry interval.
sql = """
INSERT INTO destinations (
destination, failure_ts, retry_last_ts, retry_interval
)
VALUES (?, ?, ?, ?)
ON CONFLICT (destination) DO UPDATE SET
failure_ts = EXCLUDED.failure_ts,
retry_last_ts = EXCLUDED.retry_last_ts,
retry_interval = EXCLUDED.retry_interval
WHERE
EXCLUDED.retry_interval = 0
OR destinations.retry_interval < EXCLUDED.retry_interval
"""
txn.execute(sql, (destination, failure_ts, retry_last_ts, retry_interval))
return
self.database_engine.lock_table(txn, "destinations")
# We need to be careful here as the data may have changed from under us
# due to a worker setting the timings.
prev_row = self.simple_select_one_txn(
txn,
table="destinations",
keyvalues={"destination": destination},
retcols=("failure_ts", "retry_last_ts", "retry_interval"),
allow_none=True,
)
if not prev_row:
self.simple_insert_txn(
txn,
table="destinations",
values={
"destination": destination,
"failure_ts": failure_ts,
"retry_last_ts": retry_last_ts,
"retry_interval": retry_interval,
},
)
elif retry_interval == 0 or prev_row["retry_interval"] < retry_interval:
self.simple_update_one_txn(
txn,
"destinations",
keyvalues={"destination": destination},
updatevalues={
"failure_ts": failure_ts,
"retry_last_ts": retry_last_ts,
"retry_interval": retry_interval,
},
)
def _start_cleanup_transactions(self):
return run_as_background_process(
"cleanup_transactions", self._cleanup_transactions
)
def _cleanup_transactions(self):
now = self._clock.time_msec()
month_ago = now - 30 * 24 * 60 * 60 * 1000
def _cleanup_transactions_txn(txn):
txn.execute("DELETE FROM received_transactions WHERE ts < ?", (month_ago,))
return self.runInteraction("_cleanup_transactions", _cleanup_transactions_txn)
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