mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-23 18:56:10 +00:00
![Erik Johnston](/assets/img/avatar_default.png)
This is so we can tell what is going on when things are taking a while to start up. The main change here is to ensure that transactions that are created during startup get correctly logged like normal transactions.
473 lines
15 KiB
Python
473 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 New Vector 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 gc
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import logging
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import os
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import signal
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import socket
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import sys
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import traceback
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from typing import Iterable
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from typing_extensions import NoReturn
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from twisted.internet import defer, error, reactor
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from twisted.protocols.tls import TLSMemoryBIOFactory
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import synapse
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from synapse.app import check_bind_error
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from synapse.app.phone_stats_home import start_phone_stats_home
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from synapse.config.server import ListenerConfig
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from synapse.crypto import context_factory
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from synapse.logging.context import PreserveLoggingContext
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from synapse.util.async_helpers import Linearizer
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from synapse.util.daemonize import daemonize_process
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from synapse.util.rlimit import change_resource_limit
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from synapse.util.versionstring import get_version_string
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logger = logging.getLogger(__name__)
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# list of tuples of function, args list, kwargs dict
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_sighup_callbacks = []
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def register_sighup(func, *args, **kwargs):
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"""
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Register a function to be called when a SIGHUP occurs.
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Args:
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func (function): Function to be called when sent a SIGHUP signal.
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Will be called with a single default argument, the homeserver.
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*args, **kwargs: args and kwargs to be passed to the target function.
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"""
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_sighup_callbacks.append((func, args, kwargs))
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def start_worker_reactor(appname, config, run_command=reactor.run):
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""" Run the reactor in the main process
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Daemonizes if necessary, and then configures some resources, before starting
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the reactor. Pulls configuration from the 'worker' settings in 'config'.
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Args:
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appname (str): application name which will be sent to syslog
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config (synapse.config.Config): config object
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run_command (Callable[]): callable that actually runs the reactor
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"""
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logger = logging.getLogger(config.worker_app)
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start_reactor(
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appname,
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soft_file_limit=config.soft_file_limit,
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gc_thresholds=config.gc_thresholds,
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pid_file=config.worker_pid_file,
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daemonize=config.worker_daemonize,
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print_pidfile=config.print_pidfile,
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logger=logger,
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run_command=run_command,
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)
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def start_reactor(
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appname,
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soft_file_limit,
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gc_thresholds,
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pid_file,
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daemonize,
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print_pidfile,
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logger,
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run_command=reactor.run,
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):
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""" Run the reactor in the main process
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Daemonizes if necessary, and then configures some resources, before starting
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the reactor
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Args:
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appname (str): application name which will be sent to syslog
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soft_file_limit (int):
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gc_thresholds:
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pid_file (str): name of pid file to write to if daemonize is True
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daemonize (bool): true to run the reactor in a background process
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print_pidfile (bool): whether to print the pid file, if daemonize is True
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logger (logging.Logger): logger instance to pass to Daemonize
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run_command (Callable[]): callable that actually runs the reactor
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"""
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install_dns_limiter(reactor)
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def run():
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logger.info("Running")
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change_resource_limit(soft_file_limit)
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if gc_thresholds:
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gc.set_threshold(*gc_thresholds)
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run_command()
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# make sure that we run the reactor with the sentinel log context,
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# otherwise other PreserveLoggingContext instances will get confused
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# and complain when they see the logcontext arbitrarily swapping
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# between the sentinel and `run` logcontexts.
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#
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# We also need to drop the logcontext before forking if we're daemonizing,
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# otherwise the cputime metrics get confused about the per-thread resource usage
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# appearing to go backwards.
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with PreserveLoggingContext():
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if daemonize:
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if print_pidfile:
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print(pid_file)
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daemonize_process(pid_file, logger)
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run()
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def quit_with_error(error_string: str) -> NoReturn:
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message_lines = error_string.split("\n")
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line_length = max(len(line) for line in message_lines if len(line) < 80) + 2
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sys.stderr.write("*" * line_length + "\n")
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for line in message_lines:
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sys.stderr.write(" %s\n" % (line.rstrip(),))
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sys.stderr.write("*" * line_length + "\n")
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sys.exit(1)
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def listen_metrics(bind_addresses, port):
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"""
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Start Prometheus metrics server.
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"""
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from synapse.metrics import RegistryProxy, start_http_server
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for host in bind_addresses:
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logger.info("Starting metrics listener on %s:%d", host, port)
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start_http_server(port, addr=host, registry=RegistryProxy)
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def listen_tcp(bind_addresses, port, factory, reactor=reactor, backlog=50):
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"""
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Create a TCP socket for a port and several addresses
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Returns:
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list[twisted.internet.tcp.Port]: listening for TCP connections
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"""
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r = []
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for address in bind_addresses:
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try:
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r.append(reactor.listenTCP(port, factory, backlog, address))
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except error.CannotListenError as e:
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check_bind_error(e, address, bind_addresses)
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return r
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def listen_ssl(
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bind_addresses, port, factory, context_factory, reactor=reactor, backlog=50
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):
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"""
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Create an TLS-over-TCP socket for a port and several addresses
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Returns:
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list of twisted.internet.tcp.Port listening for TLS connections
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"""
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r = []
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for address in bind_addresses:
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try:
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r.append(
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reactor.listenSSL(port, factory, context_factory, backlog, address)
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)
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except error.CannotListenError as e:
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check_bind_error(e, address, bind_addresses)
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return r
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def refresh_certificate(hs):
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"""
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Refresh the TLS certificates that Synapse is using by re-reading them from
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disk and updating the TLS context factories to use them.
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"""
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if not hs.config.has_tls_listener():
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# attempt to reload the certs for the good of the tls_fingerprints
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hs.config.read_certificate_from_disk(require_cert_and_key=False)
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return
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hs.config.read_certificate_from_disk(require_cert_and_key=True)
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hs.tls_server_context_factory = context_factory.ServerContextFactory(hs.config)
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if hs._listening_services:
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logger.info("Updating context factories...")
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for i in hs._listening_services:
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# When you listenSSL, it doesn't make an SSL port but a TCP one with
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# a TLS wrapping factory around the factory you actually want to get
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# requests. This factory attribute is public but missing from
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# Twisted's documentation.
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if isinstance(i.factory, TLSMemoryBIOFactory):
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addr = i.getHost()
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logger.info(
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"Replacing TLS context factory on [%s]:%i", addr.host, addr.port
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)
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# We want to replace TLS factories with a new one, with the new
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# TLS configuration. We do this by reaching in and pulling out
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# the wrappedFactory, and then re-wrapping it.
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i.factory = TLSMemoryBIOFactory(
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hs.tls_server_context_factory, False, i.factory.wrappedFactory
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)
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logger.info("Context factories updated.")
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def start(hs: "synapse.server.HomeServer", listeners: Iterable[ListenerConfig]):
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"""
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Start a Synapse server or worker.
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Should be called once the reactor is running and (if we're using ACME) the
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TLS certificates are in place.
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Will start the main HTTP listeners and do some other startup tasks, and then
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notify systemd.
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Args:
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hs: homeserver instance
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listeners: Listener configuration ('listeners' in homeserver.yaml)
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"""
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try:
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# Set up the SIGHUP machinery.
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if hasattr(signal, "SIGHUP"):
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def handle_sighup(*args, **kwargs):
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# Tell systemd our state, if we're using it. This will silently fail if
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# we're not using systemd.
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sdnotify(b"RELOADING=1")
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for i, args, kwargs in _sighup_callbacks:
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i(hs, *args, **kwargs)
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sdnotify(b"READY=1")
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signal.signal(signal.SIGHUP, handle_sighup)
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register_sighup(refresh_certificate)
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# Load the certificate from disk.
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refresh_certificate(hs)
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# Start the tracer
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synapse.logging.opentracing.init_tracer( # type: ignore[attr-defined] # noqa
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hs
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)
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# It is now safe to start your Synapse.
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hs.start_listening(listeners)
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hs.get_datastore().db_pool.start_profiling()
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hs.get_pusherpool().start()
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# Log when we start the shut down process.
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hs.get_reactor().addSystemEventTrigger(
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"before", "shutdown", logger.info, "Shutting down..."
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)
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setup_sentry(hs)
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setup_sdnotify(hs)
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# If background tasks are running on the main process, start collecting the
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# phone home stats.
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if hs.config.run_background_tasks:
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start_phone_stats_home(hs)
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# We now freeze all allocated objects in the hopes that (almost)
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# everything currently allocated are things that will be used for the
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# rest of time. Doing so means less work each GC (hopefully).
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#
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# This only works on Python 3.7
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if sys.version_info >= (3, 7):
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gc.collect()
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gc.freeze()
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except Exception:
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traceback.print_exc(file=sys.stderr)
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reactor = hs.get_reactor()
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if reactor.running:
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reactor.stop()
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sys.exit(1)
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def setup_sentry(hs):
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"""Enable sentry integration, if enabled in configuration
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Args:
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hs (synapse.server.HomeServer)
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"""
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if not hs.config.sentry_enabled:
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return
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import sentry_sdk
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sentry_sdk.init(dsn=hs.config.sentry_dsn, release=get_version_string(synapse))
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# We set some default tags that give some context to this instance
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with sentry_sdk.configure_scope() as scope:
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scope.set_tag("matrix_server_name", hs.config.server_name)
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app = hs.config.worker_app if hs.config.worker_app else "synapse.app.homeserver"
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name = hs.get_instance_name()
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scope.set_tag("worker_app", app)
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scope.set_tag("worker_name", name)
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def setup_sdnotify(hs):
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"""Adds process state hooks to tell systemd what we are up to.
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"""
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# Tell systemd our state, if we're using it. This will silently fail if
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# we're not using systemd.
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sdnotify(b"READY=1\nMAINPID=%i" % (os.getpid(),))
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hs.get_reactor().addSystemEventTrigger(
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"before", "shutdown", sdnotify, b"STOPPING=1"
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)
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def install_dns_limiter(reactor, max_dns_requests_in_flight=100):
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"""Replaces the resolver with one that limits the number of in flight DNS
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requests.
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This is to workaround https://twistedmatrix.com/trac/ticket/9620, where we
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can run out of file descriptors and infinite loop if we attempt to do too
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many DNS queries at once
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XXX: I'm confused by this. reactor.nameResolver does not use twisted.names unless
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you explicitly install twisted.names as the resolver; rather it uses a GAIResolver
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backed by the reactor's default threadpool (which is limited to 10 threads). So
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(a) I don't understand why twisted ticket 9620 is relevant, and (b) I don't
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understand why we would run out of FDs if we did too many lookups at once.
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-- richvdh 2020/08/29
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"""
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new_resolver = _LimitedHostnameResolver(
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reactor.nameResolver, max_dns_requests_in_flight
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)
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reactor.installNameResolver(new_resolver)
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class _LimitedHostnameResolver:
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"""Wraps a IHostnameResolver, limiting the number of in-flight DNS lookups.
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"""
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def __init__(self, resolver, max_dns_requests_in_flight):
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self._resolver = resolver
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self._limiter = Linearizer(
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name="dns_client_limiter", max_count=max_dns_requests_in_flight
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)
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def resolveHostName(
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self,
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resolutionReceiver,
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hostName,
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portNumber=0,
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addressTypes=None,
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transportSemantics="TCP",
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):
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# We need this function to return `resolutionReceiver` so we do all the
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# actual logic involving deferreds in a separate function.
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# even though this is happening within the depths of twisted, we need to drop
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# our logcontext before starting _resolve, otherwise: (a) _resolve will drop
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# the logcontext if it returns an incomplete deferred; (b) _resolve will
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# call the resolutionReceiver *with* a logcontext, which it won't be expecting.
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with PreserveLoggingContext():
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self._resolve(
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resolutionReceiver,
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hostName,
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portNumber,
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addressTypes,
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transportSemantics,
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)
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return resolutionReceiver
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@defer.inlineCallbacks
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def _resolve(
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self,
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resolutionReceiver,
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hostName,
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portNumber=0,
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addressTypes=None,
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transportSemantics="TCP",
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):
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with (yield self._limiter.queue(())):
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# resolveHostName doesn't return a Deferred, so we need to hook into
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# the receiver interface to get told when resolution has finished.
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deferred = defer.Deferred()
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receiver = _DeferredResolutionReceiver(resolutionReceiver, deferred)
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self._resolver.resolveHostName(
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receiver, hostName, portNumber, addressTypes, transportSemantics
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)
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yield deferred
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class _DeferredResolutionReceiver:
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"""Wraps a IResolutionReceiver and simply resolves the given deferred when
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resolution is complete
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"""
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def __init__(self, receiver, deferred):
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self._receiver = receiver
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self._deferred = deferred
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def resolutionBegan(self, resolutionInProgress):
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self._receiver.resolutionBegan(resolutionInProgress)
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def addressResolved(self, address):
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self._receiver.addressResolved(address)
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def resolutionComplete(self):
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self._deferred.callback(())
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self._receiver.resolutionComplete()
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sdnotify_sockaddr = os.getenv("NOTIFY_SOCKET")
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def sdnotify(state):
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"""
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Send a notification to systemd, if the NOTIFY_SOCKET env var is set.
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This function is based on the sdnotify python package, but since it's only a few
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lines of code, it's easier to duplicate it here than to add a dependency on a
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package which many OSes don't include as a matter of principle.
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Args:
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state (bytes): notification to send
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"""
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if not isinstance(state, bytes):
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raise TypeError("sdnotify should be called with a bytes")
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if not sdnotify_sockaddr:
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return
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addr = sdnotify_sockaddr
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if addr[0] == "@":
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addr = "\0" + addr[1:]
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try:
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with socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM) as sock:
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sock.connect(addr)
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sock.sendall(state)
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except Exception as e:
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# this is a bit surprising, since we don't expect to have a NOTIFY_SOCKET
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# unless systemd is expecting us to notify it.
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logger.warning("Unable to send notification to systemd: %s", e)
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