275 lines
8.2 KiB
Python
275 lines
8.2 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 signal
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import sys
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import traceback
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import psutil
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from daemonize import Daemonize
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from twisted.internet import error, reactor
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from twisted.protocols.tls import TLSMemoryBIOFactory
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from synapse.app import check_bind_error
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from synapse.crypto import context_factory
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from synapse.util import PreserveLoggingContext
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from synapse.util.rlimit import change_resource_limit
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logger = logging.getLogger(__name__)
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_sighup_callbacks = []
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def register_sighup(func):
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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 argument, the homeserver.
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"""
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_sighup_callbacks.append(func)
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def start_worker_reactor(appname, config):
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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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"""
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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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config.soft_file_limit,
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config.gc_thresholds,
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config.worker_pid_file,
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config.worker_daemonize,
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config.worker_cpu_affinity,
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logger,
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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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cpu_affinity,
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logger,
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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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cpu_affinity (int|None): cpu affinity mask
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logger (logging.Logger): logger instance to pass to Daemonize
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"""
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def run():
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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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with PreserveLoggingContext():
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logger.info("Running")
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if cpu_affinity is not None:
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# Turn the bitmask into bits, reverse it so we go from 0 up
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mask_to_bits = bin(cpu_affinity)[2:][::-1]
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cpus = []
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cpu_num = 0
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for i in mask_to_bits:
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if i == "1":
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cpus.append(cpu_num)
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cpu_num += 1
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p = psutil.Process()
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p.cpu_affinity(cpus)
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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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reactor.run()
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if daemonize:
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daemon = Daemonize(
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app=appname,
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pid=pid_file,
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action=run,
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auto_close_fds=False,
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verbose=True,
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logger=logger,
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)
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daemon.start()
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else:
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run()
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def quit_with_error(error_string):
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message_lines = error_string.split("\n")
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line_length = max([len(l) for l in message_lines if len(l) < 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
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from prometheus_client import start_http_server
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for host in bind_addresses:
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reactor.callInThread(start_http_server, int(port),
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addr=host, registry=RegistryProxy)
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logger.info("Metrics now reporting on %s:%d", host, port)
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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 (empty)
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"""
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for address in bind_addresses:
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try:
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reactor.listenTCP(
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port,
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factory,
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backlog,
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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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logger.info("Synapse now listening on TCP port %d", port)
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return []
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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(
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port,
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factory,
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context_factory,
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backlog,
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address
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)
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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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logger.info("Synapse now listening on port %d (TLS)", port)
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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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# 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,
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False,
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i.factory.wrappedFactory
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)
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logger.info("Context factories updated.")
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def start(hs, listeners=None):
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"""
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Start a Synapse server or worker.
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Args:
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hs (synapse.server.HomeServer)
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listeners (list[dict]): 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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for i in _sighup_callbacks:
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i(hs)
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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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# It is now safe to start your Synapse.
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hs.start_listening(listeners)
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hs.get_datastore().start_profiling()
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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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