diff options
Diffstat (limited to 'synapse/logging/_terse_json.py')
| -rw-r--r-- | synapse/logging/_terse_json.py | 109 |
1 files changed, 79 insertions, 30 deletions
diff --git a/synapse/logging/_terse_json.py b/synapse/logging/_terse_json.py index 0ebbde06f2..c0b9384189 100644 --- a/synapse/logging/_terse_json.py +++ b/synapse/logging/_terse_json.py @@ -17,25 +17,29 @@ Log formatters that output terse JSON. """ +import json import sys +import traceback from collections import deque from ipaddress import IPv4Address, IPv6Address, ip_address from math import floor -from typing import IO +from typing import IO, Optional import attr -from simplejson import dumps from zope.interface import implementer from twisted.application.internet import ClientService +from twisted.internet.defer import Deferred from twisted.internet.endpoints import ( HostnameEndpoint, TCP4ClientEndpoint, TCP6ClientEndpoint, ) +from twisted.internet.interfaces import IPushProducer, ITransport from twisted.internet.protocol import Factory, Protocol from twisted.logger import FileLogObserver, ILogObserver, Logger -from twisted.python.failure import Failure + +_encoder = json.JSONEncoder(ensure_ascii=False, separators=(",", ":")) def flatten_event(event: dict, metadata: dict, include_time: bool = False): @@ -141,19 +145,57 @@ def TerseJSONToConsoleLogObserver(outFile: IO[str], metadata: dict) -> FileLogOb def formatEvent(_event: dict) -> str: flattened = flatten_event(_event, metadata) - return dumps(flattened, ensure_ascii=False, separators=(",", ":")) + "\n" + return _encoder.encode(flattened) + "\n" return FileLogObserver(outFile, formatEvent) @attr.s +@implementer(IPushProducer) +class LogProducer(object): + """ + An IPushProducer that writes logs from its buffer to its transport when it + is resumed. + + Args: + buffer: Log buffer to read logs from. + transport: Transport to write to. + """ + + transport = attr.ib(type=ITransport) + _buffer = attr.ib(type=deque) + _paused = attr.ib(default=False, type=bool, init=False) + + def pauseProducing(self): + self._paused = True + + def stopProducing(self): + self._paused = True + self._buffer = deque() + + def resumeProducing(self): + self._paused = False + + while self._paused is False and (self._buffer and self.transport.connected): + try: + event = self._buffer.popleft() + self.transport.write(_encoder.encode(event).encode("utf8")) + self.transport.write(b"\n") + except Exception: + # Something has gone wrong writing to the transport -- log it + # and break out of the while. + traceback.print_exc(file=sys.__stderr__) + break + + +@attr.s @implementer(ILogObserver) class TerseJSONToTCPLogObserver(object): """ An IObserver that writes JSON logs to a TCP target. Args: - hs (HomeServer): The Homeserver that is being logged for. + hs (HomeServer): The homeserver that is being logged for. host: The host of the logging target. port: The logging target's port. metadata: Metadata to be added to each log entry. @@ -165,8 +207,9 @@ class TerseJSONToTCPLogObserver(object): metadata = attr.ib(type=dict) maximum_buffer = attr.ib(type=int) _buffer = attr.ib(default=attr.Factory(deque), type=deque) - _writer = attr.ib(default=None) + _connection_waiter = attr.ib(default=None, type=Optional[Deferred]) _logger = attr.ib(default=attr.Factory(Logger)) + _producer = attr.ib(default=None, type=Optional[LogProducer]) def start(self) -> None: @@ -187,38 +230,44 @@ class TerseJSONToTCPLogObserver(object): factory = Factory.forProtocol(Protocol) self._service = ClientService(endpoint, factory, clock=self.hs.get_reactor()) self._service.startService() + self._connect() - def _write_loop(self) -> None: + def stop(self): + self._service.stopService() + + def _connect(self) -> None: """ - Implement the write loop. + Triggers an attempt to connect then write to the remote if not already writing. """ - if self._writer: + if self._connection_waiter: return - self._writer = self._service.whenConnected() + self._connection_waiter = self._service.whenConnected(failAfterFailures=1) + + @self._connection_waiter.addErrback + def fail(r): + r.printTraceback(file=sys.__stderr__) + self._connection_waiter = None + self._connect() - @self._writer.addBoth + @self._connection_waiter.addCallback def writer(r): - if isinstance(r, Failure): - r.printTraceback(file=sys.__stderr__) - self._writer = None - self.hs.get_reactor().callLater(1, self._write_loop) + # We have a connection. If we already have a producer, and its + # transport is the same, just trigger a resumeProducing. + if self._producer and r.transport is self._producer.transport: + self._producer.resumeProducing() + self._connection_waiter = None return - try: - for event in self._buffer: - r.transport.write( - dumps(event, ensure_ascii=False, separators=(",", ":")).encode( - "utf8" - ) - ) - r.transport.write(b"\n") - self._buffer.clear() - except Exception as e: - sys.__stderr__.write("Failed writing out logs with %s\n" % (str(e),)) - - self._writer = False - self.hs.get_reactor().callLater(1, self._write_loop) + # If the producer is still producing, stop it. + if self._producer: + self._producer.stopProducing() + + # Make a new producer and start it. + self._producer = LogProducer(buffer=self._buffer, transport=r.transport) + r.transport.registerProducer(self._producer, True) + self._producer.resumeProducing() + self._connection_waiter = None def _handle_pressure(self) -> None: """ @@ -277,4 +326,4 @@ class TerseJSONToTCPLogObserver(object): self._logger.failure("Failed clearing backpressure") # Try and write immediately. - self._write_loop() + self._connect() |