diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
deleted file mode 100644
index 289c117396..0000000000
--- a/synapse/storage/transactions.py
+++ /dev/null
@@ -1,274 +0,0 @@
-# -*- 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.util.caches.expiringcache import ExpiringCache
-
-from ._base import SQLBaseStore, db_to_json
-
-# 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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