661 lines
23 KiB
Python
661 lines
23 KiB
Python
# 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 atexit
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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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import warnings
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from typing import (
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TYPE_CHECKING,
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Any,
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Awaitable,
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Callable,
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Collection,
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Dict,
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Iterable,
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List,
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NoReturn,
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Optional,
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Tuple,
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cast,
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)
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from cryptography.utils import CryptographyDeprecationWarning
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from typing_extensions import ParamSpec
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import twisted
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from twisted.internet import defer, error, reactor as _reactor
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from twisted.internet.interfaces import IOpenSSLContextFactory, IReactorSSL, IReactorTCP
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from twisted.internet.protocol import ServerFactory
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from twisted.internet.tcp import Port
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from twisted.logger import LoggingFile, LogLevel
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from twisted.protocols.tls import TLSMemoryBIOFactory
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from twisted.python.threadpool import ThreadPool
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import synapse.util.caches
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from synapse.api.constants import MAX_PDU_SIZE
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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 import ConfigError
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from synapse.config._base import format_config_error
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from synapse.config.homeserver import HomeServerConfig
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from synapse.config.server import ManholeConfig
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from synapse.crypto import context_factory
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from synapse.events.presence_router import load_legacy_presence_router
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from synapse.events.spamcheck import load_legacy_spam_checkers
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from synapse.events.third_party_rules import load_legacy_third_party_event_rules
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from synapse.handlers.auth import load_legacy_password_auth_providers
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from synapse.logging.context import PreserveLoggingContext
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from synapse.logging.opentracing import init_tracer
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from synapse.metrics import install_gc_manager, register_threadpool
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from synapse.metrics.background_process_metrics import wrap_as_background_process
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from synapse.metrics.jemalloc import setup_jemalloc_stats
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from synapse.types import ISynapseReactor
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from synapse.util import SYNAPSE_VERSION
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from synapse.util.caches.lrucache import setup_expire_lru_cache_entries
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from synapse.util.daemonize import daemonize_process
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from synapse.util.gai_resolver import GAIResolver
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from synapse.util.rlimit import change_resource_limit
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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# Twisted injects the global reactor to make it easier to import, this confuses
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# mypy which thinks it is a module. Tell it that it a more proper type.
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reactor = cast(ISynapseReactor, _reactor)
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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: List[
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Tuple[Callable[..., None], Tuple[object, ...], Dict[str, object]]
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] = []
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P = ParamSpec("P")
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def register_sighup(func: Callable[P, None], *args: P.args, **kwargs: P.kwargs) -> None:
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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 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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# This type-ignore should be redundant once we use a mypy release with
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# https://github.com/python/mypy/pull/12668.
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_sighup_callbacks.append((func, args, kwargs)) # type: ignore[arg-type]
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def start_worker_reactor(
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appname: str,
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config: HomeServerConfig,
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# Use a lambda to avoid binding to a given reactor at import time.
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# (needed when synapse.app.complement_fork_starter is being used)
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run_command: Callable[[], None] = lambda: reactor.run(),
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) -> None:
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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: application name which will be sent to syslog
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config: config object
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run_command: callable that actually runs the reactor
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"""
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logger = logging.getLogger(config.worker.worker_app)
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start_reactor(
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appname,
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soft_file_limit=config.server.soft_file_limit,
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gc_thresholds=config.server.gc_thresholds,
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pid_file=config.worker.worker_pid_file,
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daemonize=config.worker.worker_daemonize,
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print_pidfile=config.server.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: str,
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soft_file_limit: int,
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gc_thresholds: Optional[Tuple[int, int, int]],
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pid_file: Optional[str],
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daemonize: bool,
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print_pidfile: bool,
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logger: logging.Logger,
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# Use a lambda to avoid binding to a given reactor at import time.
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# (needed when synapse.app.complement_fork_starter is being used)
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run_command: Callable[[], None] = lambda: reactor.run(),
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) -> None:
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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: application name which will be sent to syslog
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soft_file_limit:
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gc_thresholds:
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pid_file: name of pid file to write to if daemonize is True
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daemonize: true to run the reactor in a background process
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print_pidfile: whether to print the pid file, if daemonize is True
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logger: logger instance to pass to Daemonize
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run_command: callable that actually runs the reactor
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"""
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def run() -> None:
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logger.info("Running")
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setup_jemalloc_stats()
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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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install_gc_manager()
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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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assert pid_file is not None
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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 = min(max(len(line) for line in message_lines), 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 handle_startup_exception(e: Exception) -> NoReturn:
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# Exceptions that occur between setting up the logging and forking or starting
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# the reactor are written to the logs, followed by a summary to stderr.
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logger.exception("Exception during startup")
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quit_with_error(
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f"Error during initialisation:\n {e}\nThere may be more information in the logs."
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)
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def redirect_stdio_to_logs() -> None:
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streams = [("stdout", LogLevel.info), ("stderr", LogLevel.error)]
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for (stream, level) in streams:
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oldStream = getattr(sys, stream)
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loggingFile = LoggingFile(
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logger=twisted.logger.Logger(namespace=stream),
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level=level,
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encoding=getattr(oldStream, "encoding", None),
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)
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setattr(sys, stream, loggingFile)
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print("Redirected stdout/stderr to logs")
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def register_start(
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cb: Callable[P, Awaitable], *args: P.args, **kwargs: P.kwargs
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) -> 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() -> None:
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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(
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bind_addresses: Iterable[str], port: int, enable_legacy_metric_names: bool
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) -> None:
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"""
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Start Prometheus metrics server.
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"""
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from prometheus_client import start_http_server as start_http_server_prometheus
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from synapse.metrics import (
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RegistryProxy,
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start_http_server as start_http_server_legacy,
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)
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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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if enable_legacy_metric_names:
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start_http_server_legacy(port, addr=host, registry=RegistryProxy)
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else:
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_set_prometheus_client_use_created_metrics(False)
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start_http_server_prometheus(port, addr=host, registry=RegistryProxy)
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def _set_prometheus_client_use_created_metrics(new_value: bool) -> None:
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"""
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Sets whether prometheus_client should expose `_created`-suffixed metrics for
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all gauges, histograms and summaries.
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There is no programmatic way to disable this without poking at internals;
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the proper way is to use an environment variable which prometheus_client
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loads at import time.
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The motivation for disabling these `_created` metrics is that they're
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a waste of space as they're not useful but they take up space in Prometheus.
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"""
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import prometheus_client.metrics
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if hasattr(prometheus_client.metrics, "_use_created"):
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prometheus_client.metrics._use_created = new_value
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else:
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logger.error(
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"Can't disable `_created` metrics in prometheus_client (brittle hack broken?)"
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)
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def listen_manhole(
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bind_addresses: Collection[str],
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port: int,
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manhole_settings: ManholeConfig,
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manhole_globals: dict,
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) -> None:
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# twisted.conch.manhole 21.1.0 uses "int_from_bytes", which produces a confusing
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# warning. It's fixed by https://github.com/twisted/twisted/pull/1522), so
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# suppress the warning for now.
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warnings.filterwarnings(
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action="ignore",
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category=CryptographyDeprecationWarning,
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message="int_from_bytes is deprecated",
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)
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from synapse.util.manhole import manhole
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listen_tcp(
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bind_addresses,
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port,
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manhole(settings=manhole_settings, globals=manhole_globals),
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)
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def listen_tcp(
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bind_addresses: Collection[str],
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port: int,
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factory: ServerFactory,
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reactor: IReactorTCP = reactor,
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backlog: int = 50,
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) -> List[Port]:
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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 of 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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# IReactorTCP returns an object implementing IListeningPort from listenTCP,
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# but we know it will be a Port instance.
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return r # type: ignore[return-value]
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def listen_ssl(
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bind_addresses: Collection[str],
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port: int,
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factory: ServerFactory,
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context_factory: IOpenSSLContextFactory,
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reactor: IReactorSSL = reactor,
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backlog: int = 50,
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) -> List[Port]:
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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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# IReactorSSL incorrectly declares that an int is returned from listenSSL,
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# it actually returns an object implementing IListeningPort, but we know it
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# will be a Port instance.
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return r # type: ignore[return-value]
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def refresh_certificate(hs: "HomeServer") -> None:
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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.server.has_tls_listener():
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return
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hs.config.tls.read_certificate_from_disk()
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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: "HomeServer") -> None:
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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.
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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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"""
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reactor = hs.get_reactor()
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# We want to use a separate thread pool for the resolver so that large
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# numbers of DNS requests don't starve out other users of the threadpool.
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resolver_threadpool = ThreadPool(name="gai_resolver")
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resolver_threadpool.start()
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reactor.addSystemEventTrigger("during", "shutdown", resolver_threadpool.stop)
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reactor.installNameResolver(
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GAIResolver(reactor, getThreadPool=lambda: resolver_threadpool)
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)
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# Register the threadpools with our metrics.
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register_threadpool("default", reactor.getThreadPool())
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register_threadpool("gai_resolver", resolver_threadpool)
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# Set up the SIGHUP machinery.
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if hasattr(signal, "SIGHUP"):
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@wrap_as_background_process("sighup")
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async def handle_sighup(*args: Any, **kwargs: Any) -> None:
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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: Any, **kwargs: Any) -> None:
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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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register_sighup(reload_cache_config, hs.config)
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# Apply the cache config.
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hs.config.caches.resize_all_caches()
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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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init_tracer(hs) # noqa
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# Instantiate the modules so they can register their web resources to the module API
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# before we start the listeners.
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module_api = hs.get_module_api()
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for module, config in hs.config.modules.loaded_modules:
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m = module(config, module_api)
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logger.info("Loaded module %s", m)
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load_legacy_spam_checkers(hs)
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load_legacy_third_party_event_rules(hs)
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load_legacy_presence_router(hs)
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load_legacy_password_auth_providers(hs)
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# If we've configured an expiry time for caches, start the background job now.
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setup_expire_lru_cache_entries(hs)
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# It is now safe to start your Synapse.
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hs.start_listening()
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hs.get_datastores().main.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..."
|
|
)
|
|
|
|
setup_sentry(hs)
|
|
setup_sdnotify(hs)
|
|
|
|
# If background tasks are running on the main process, start collecting the
|
|
# phone home stats.
|
|
if hs.config.worker.run_background_tasks:
|
|
start_phone_stats_home(hs)
|
|
|
|
# We now freeze all allocated objects in the hopes that (almost)
|
|
# everything currently allocated are things that will be used for the
|
|
# rest of time. Doing so means less work each GC (hopefully).
|
|
#
|
|
# PyPy does not (yet?) implement gc.freeze()
|
|
if hasattr(gc, "freeze"):
|
|
gc.collect()
|
|
gc.freeze()
|
|
|
|
# Speed up shutdowns by freezing all allocated objects. This moves everything
|
|
# into the permanent generation and excludes them from the final GC.
|
|
atexit.register(gc.freeze)
|
|
|
|
|
|
def reload_cache_config(config: HomeServerConfig) -> None:
|
|
"""Reload cache config from disk and immediately apply it.resize caches accordingly.
|
|
|
|
If the config is invalid, a `ConfigError` is logged and no changes are made.
|
|
|
|
Otherwise, this:
|
|
- replaces the `caches` section on the given `config` object,
|
|
- resizes all caches according to the new cache factors, and
|
|
|
|
Note that the following cache config keys are read, but not applied:
|
|
- event_cache_size: used to set a max_size and _original_max_size on
|
|
EventsWorkerStore._get_event_cache when it is created. We'd have to update
|
|
the _original_max_size (and maybe
|
|
- sync_response_cache_duration: would have to update the timeout_sec attribute on
|
|
HomeServer -> SyncHandler -> ResponseCache.
|
|
- track_memory_usage. This affects synapse.util.caches.TRACK_MEMORY_USAGE which
|
|
influences Synapse's self-reported metrics.
|
|
|
|
Also, the HTTPConnectionPool in SimpleHTTPClient sets its maxPersistentPerHost
|
|
parameter based on the global_factor. This won't be applied on a config reload.
|
|
"""
|
|
try:
|
|
previous_cache_config = config.reload_config_section("caches")
|
|
except ConfigError as e:
|
|
logger.warning("Failed to reload cache config")
|
|
for f in format_config_error(e):
|
|
logger.warning(f)
|
|
else:
|
|
logger.debug(
|
|
"New cache config. Was:\n %s\nNow:\n",
|
|
previous_cache_config.__dict__,
|
|
config.caches.__dict__,
|
|
)
|
|
synapse.util.caches.TRACK_MEMORY_USAGE = config.caches.track_memory_usage
|
|
config.caches.resize_all_caches()
|
|
|
|
|
|
def setup_sentry(hs: "HomeServer") -> None:
|
|
"""Enable sentry integration, if enabled in configuration"""
|
|
|
|
if not hs.config.metrics.sentry_enabled:
|
|
return
|
|
|
|
import sentry_sdk
|
|
|
|
sentry_sdk.init(
|
|
dsn=hs.config.metrics.sentry_dsn,
|
|
release=SYNAPSE_VERSION,
|
|
)
|
|
|
|
# We set some default tags that give some context to this instance
|
|
with sentry_sdk.configure_scope() as scope:
|
|
scope.set_tag("matrix_server_name", hs.config.server.server_name)
|
|
|
|
app = (
|
|
hs.config.worker.worker_app
|
|
if hs.config.worker.worker_app
|
|
else "synapse.app.homeserver"
|
|
)
|
|
name = hs.get_instance_name()
|
|
scope.set_tag("worker_app", app)
|
|
scope.set_tag("worker_name", name)
|
|
|
|
|
|
def setup_sdnotify(hs: "HomeServer") -> None:
|
|
"""Adds process state hooks to tell systemd what we are up to."""
|
|
|
|
# Tell systemd our state, if we're using it. This will silently fail if
|
|
# we're not using systemd.
|
|
sdnotify(b"READY=1\nMAINPID=%i" % (os.getpid(),))
|
|
|
|
hs.get_reactor().addSystemEventTrigger(
|
|
"before", "shutdown", sdnotify, b"STOPPING=1"
|
|
)
|
|
|
|
|
|
sdnotify_sockaddr = os.getenv("NOTIFY_SOCKET")
|
|
|
|
|
|
def sdnotify(state: bytes) -> None:
|
|
"""
|
|
Send a notification to systemd, if the NOTIFY_SOCKET env var is set.
|
|
|
|
This function is based on the sdnotify python package, but since it's only a few
|
|
lines of code, it's easier to duplicate it here than to add a dependency on a
|
|
package which many OSes don't include as a matter of principle.
|
|
|
|
Args:
|
|
state: notification to send
|
|
"""
|
|
if not isinstance(state, bytes):
|
|
raise TypeError("sdnotify should be called with a bytes")
|
|
if not sdnotify_sockaddr:
|
|
return
|
|
addr = sdnotify_sockaddr
|
|
if addr[0] == "@":
|
|
addr = "\0" + addr[1:]
|
|
|
|
try:
|
|
with socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM) as sock:
|
|
sock.connect(addr)
|
|
sock.sendall(state)
|
|
except Exception as e:
|
|
# this is a bit surprising, since we don't expect to have a NOTIFY_SOCKET
|
|
# unless systemd is expecting us to notify it.
|
|
logger.warning("Unable to send notification to systemd: %s", e)
|
|
|
|
|
|
def max_request_body_size(config: HomeServerConfig) -> int:
|
|
"""Get a suitable maximum size for incoming HTTP requests"""
|
|
|
|
# Other than media uploads, the biggest request we expect to see is a fully-loaded
|
|
# /federation/v1/send request.
|
|
#
|
|
# The main thing in such a request is up to 50 PDUs, and up to 100 EDUs. PDUs are
|
|
# limited to 65536 bytes (possibly slightly more if the sender didn't use canonical
|
|
# json encoding); there is no specced limit to EDUs (see
|
|
# https://github.com/matrix-org/matrix-doc/issues/3121).
|
|
#
|
|
# in short, we somewhat arbitrarily limit requests to 200 * 64K (about 12.5M)
|
|
#
|
|
max_request_size = 200 * MAX_PDU_SIZE
|
|
|
|
# if we have a media repo enabled, we may need to allow larger uploads than that
|
|
if config.media.can_load_media_repo:
|
|
max_request_size = max(max_request_size, config.media.max_upload_size)
|
|
|
|
return max_request_size
|