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Merge pull request #767 from matrix-org/erikj/transaction_txn

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Reduce database inserts when sending transactions
This commit is contained in:
Erik Johnston 2016-05-06 13:20:43 +01:00
commit 96d9d5d388
2 changed files with 122 additions and 45 deletions
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2
synapse/handlers/presence.py
View file

@ -168,7 +168,7 @@ class PresenceHandler(BaseHandler):
# The initial delay is to allow disconnected clients a chance to
# reconnect before we treat them as offline.
self.clock.call_later(
0 * 1000,
30 * 1000,
self.clock.looping_call,
self._handle_timeouts,
5000,

165
synapse/storage/transactions.py
View file

@ -16,16 +16,56 @@
from ._base import SQLBaseStore
from synapse.util.caches.descriptors import cached
from twisted.internet import defer, reactor
from canonicaljson import encode_canonical_json
from collections import namedtuple
import itertools
import logging
logger = logging.getLogger(__name__)
_TransactionRow = namedtuple(
"_TransactionRow", (
"id", "transaction_id", "destination", "ts", "response_code",
"response_json",
)
)
_UpdateTransactionRow = namedtuple(
"_TransactionRow", (
"response_code", "response_json",
)
)
class TransactionStore(SQLBaseStore):
"""A collection of queries for handling PDUs.
"""
def __init__(self, hs):
super(TransactionStore, self).__init__(hs)
# New transactions that are currently in flights
self.inflight_transactions = {}
# Newly delievered transactions that *weren't* persisted while in flight
self.new_delivered_transactions = {}
# Newly delivered transactions that *were* persisted while in flight
self.update_delivered_transactions = {}
self.last_transaction = {}
reactor.addSystemEventTrigger("before", "shutdown", self._persist_in_mem_txns)
hs.get_clock().looping_call(
self._persist_in_mem_txns,
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
@ -108,17 +148,30 @@ class TransactionStore(SQLBaseStore):
list: A list of previous transaction ids.
"""
return self.runInteraction(
"prep_send_transaction",
self._prep_send_transaction,
transaction_id, destination, origin_server_ts
auto_id = self._transaction_id_gen.get_next()
txn_row = _TransactionRow(
id=auto_id,
transaction_id=transaction_id,
destination=destination,
ts=origin_server_ts,
response_code=0,
response_json=None,
)
def _prep_send_transaction(self, txn, transaction_id, destination,
origin_server_ts):
self.inflight_transactions.setdefault(destination, {})[transaction_id] = txn_row
next_id = self._transaction_id_gen.get_next()
prev_txn = self.last_transaction.get(destination)
if prev_txn:
return defer.succeed(prev_txn)
else:
return self.runInteraction(
"_get_prevs_txn",
self._get_prevs_txn,
destination,
)
def _get_prevs_txn(self, txn, destination):
# First we find out what the prev_txns should be.
# Since we know that we are only sending one transaction at a time,
# we can simply take the last one.
@ -133,23 +186,6 @@ class TransactionStore(SQLBaseStore):
prev_txns = [r["transaction_id"] for r in results]
# Actually add the new transaction to the sent_transactions table.
self._simple_insert_txn(
txn,
table="sent_transactions",
values={
"id": next_id,
"transaction_id": transaction_id,
"destination": destination,
"ts": origin_server_ts,
"response_code": 0,
"response_json": None,
}
)
# TODO Update the tx id -> pdu id mapping
return prev_txns
def delivered_txn(self, transaction_id, destination, code, response_dict):
@ -161,27 +197,23 @@ class TransactionStore(SQLBaseStore):
code (int)
response_json (str)
"""
return self.runInteraction(
"delivered_txn",
self._delivered_txn,
transaction_id, destination, code,
buffer(encode_canonical_json(response_dict)),
)
def _delivered_txn(self, txn, transaction_id, destination,
code, response_json):
self._simple_update_one_txn(
txn,
table="sent_transactions",
keyvalues={
"transaction_id": transaction_id,
"destination": destination,
},
updatevalues={
"response_code": code,
"response_json": None, # For now, don't persist response_json
}
)
txn_row = self.inflight_transactions.get(
destination, {}
).pop(transaction_id, None)
self.last_transaction[destination] = transaction_id
if txn_row:
d = self.new_delivered_transactions.setdefault(destination, {})
d[transaction_id] = txn_row._replace(
response_code=code,
response_json=None, # For now, don't persist response
)
else:
d = self.update_delivered_transactions.setdefault(destination, {})
# For now, don't persist response
d[transaction_id] = _UpdateTransactionRow(code, None)
def get_transactions_after(self, transaction_id, destination):
"""Get all transactions after a given local transaction_id.
@ -305,3 +337,48 @@ class TransactionStore(SQLBaseStore):
txn.execute(query, (self._clock.time_msec(),))
return self.cursor_to_dict(txn)
@defer.inlineCallbacks
def _persist_in_mem_txns(self):
try:
inflight = self.inflight_transactions
new_delivered = self.new_delivered_transactions
update_delivered = self.update_delivered_transactions
self.inflight_transactions = {}
self.new_delivered_transactions = {}
self.update_delivered_transactions = {}
full_rows = [
row._asdict()
for txn_map in itertools.chain(inflight.values(), new_delivered.values())
for row in txn_map.values()
]
def f(txn):
if full_rows:
self._simple_insert_many_txn(
txn=txn,
table="sent_transactions",
values=full_rows
)
for dest, txn_map in update_delivered.items():
for txn_id, update_row in txn_map.items():
self._simple_update_one_txn(
txn,
table="sent_transactions",
keyvalues={
"transaction_id": txn_id,
"destination": dest,
},
updatevalues={
"response_code": update_row.response_code,
"response_json": None, # For now, don't persist response
}
)
if full_rows or update_delivered:
yield self.runInteraction("_persist_in_mem_txns", f)
except:
logger.exception("Failed to persist transactions!")