517 lines
18 KiB
Python
517 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 New Vector Ltd
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# Copyright 2019-2021 The Matrix.org Foundation C.I.C
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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 platform
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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 Awaitable, Callable, 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.metrics.background_process_metrics import wrap_as_background_process
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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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*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 register_start(cb: Callable[..., Awaitable], *args, **kwargs) -> None:
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"""Register a callback with the reactor, to be called once it is running
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This can be used to initialise parts of the system which require an asynchronous
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setup.
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Any exception raised by the callback will be printed and logged, and the process
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will exit.
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"""
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async def wrapper():
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try:
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await cb(*args, **kwargs)
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except Exception:
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# previously, we used Failure().printTraceback() here, in the hope that
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# would give better tracebacks than traceback.print_exc(). However, that
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# doesn't handle chained exceptions (with a __cause__ or __context__) well,
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# and I *think* the need for Failure() is reduced now that we mostly use
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# async/await.
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# Write the exception to both the logs *and* the unredirected stderr,
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# because people tend to get confused if it only goes to one or the other.
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#
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# One problem with this is that if people are using a logging config that
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# logs to the console (as is common eg under docker), they will get two
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# copies of the exception. We could maybe try to detect that, but it's
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# probably a cost we can bear.
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logger.fatal("Error during startup", exc_info=True)
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print("Error during startup:", file=sys.__stderr__)
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traceback.print_exc(file=sys.__stderr__)
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# it's no use calling sys.exit here, since that just raises a SystemExit
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# exception which is then caught by the reactor, and everything carries
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# on as normal.
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os._exit(1)
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reactor.callWhenRunning(lambda: defer.ensureDeferred(wrapper()))
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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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async 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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# Set up the SIGHUP machinery.
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if hasattr(signal, "SIGHUP"):
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reactor = hs.get_reactor()
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@wrap_as_background_process("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(*args, **kwargs)
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sdnotify(b"READY=1")
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# We defer running the sighup handlers until next reactor tick. This
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# is so that we're in a sane state, e.g. flushing the logs may fail
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# if the sighup happens in the middle of writing a log entry.
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def run_sighup(*args, **kwargs):
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# `callFromThread` should be "signal safe" as well as thread
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# safe.
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reactor.callFromThread(handle_sighup, *args, **kwargs)
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signal.signal(signal.SIGHUP, run_sighup)
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register_sighup(refresh_certificate, hs)
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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 platform.python_implementation() == "CPython" and sys.version_info >= (3, 7):
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gc.collect()
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gc.freeze()
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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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