forked from MirrorHub/synapse
f13a8d1c69
If you're trying to shut down Synapse, it's rather handy if it *actually* shuts down before you move on.
339 lines
11 KiB
Python
Executable file
339 lines
11 KiB
Python
Executable file
#!/usr/bin/env python
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 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 argparse
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import collections
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import errno
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import glob
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import os
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import os.path
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import signal
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import subprocess
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import sys
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import time
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from typing import Iterable, Optional
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import yaml
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from synapse.config import find_config_files
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MAIN_PROCESS = "synapse.app.homeserver"
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GREEN = "\x1b[1;32m"
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YELLOW = "\x1b[1;33m"
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RED = "\x1b[1;31m"
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NORMAL = "\x1b[m"
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def pid_running(pid):
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try:
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os.kill(pid, 0)
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return True
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except OSError as err:
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if err.errno == errno.EPERM:
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return True
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return False
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def write(message, colour=NORMAL, stream=sys.stdout):
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# Lets check if we're writing to a TTY before colouring
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should_colour = False
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try:
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should_colour = stream.isatty()
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except AttributeError:
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# Just in case `isatty` isn't defined on everything. The python
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# docs are incredibly vague.
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pass
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if not should_colour:
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stream.write(message + "\n")
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else:
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stream.write(colour + message + NORMAL + "\n")
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def abort(message, colour=RED, stream=sys.stderr):
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write(message, colour, stream)
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sys.exit(1)
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def start(pidfile: str, app: str, config_files: Iterable[str], daemonize: bool) -> bool:
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"""Attempts to start a synapse main or worker process.
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Args:
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pidfile: the pidfile we expect the process to create
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app: the python module to run
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config_files: config files to pass to synapse
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daemonize: if True, will include a --daemonize argument to synapse
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Returns:
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True if the process started successfully or was already running
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False if there was an error starting the process
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"""
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if os.path.exists(pidfile) and pid_running(int(open(pidfile).read())):
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print(app + " already running")
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return True
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args = [sys.executable, "-m", app]
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for c in config_files:
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args += ["-c", c]
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if daemonize:
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args.append("--daemonize")
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try:
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subprocess.check_call(args)
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write("started %s(%s)" % (app, ",".join(config_files)), colour=GREEN)
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return True
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except subprocess.CalledProcessError as e:
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err = "%s(%s) failed to start (exit code: %d). Check the Synapse logfile" % (
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app,
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",".join(config_files),
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e.returncode,
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)
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if daemonize:
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err += ", or run synctl with --no-daemonize"
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err += "."
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write(err, colour=RED, stream=sys.stderr)
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return False
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def stop(pidfile: str, app: str) -> Optional[int]:
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"""Attempts to kill a synapse worker from the pidfile.
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Args:
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pidfile: path to file containing worker's pid
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app: name of the worker's appservice
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Returns:
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process id, or None if the process was not running
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"""
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if os.path.exists(pidfile):
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pid = int(open(pidfile).read())
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try:
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os.kill(pid, signal.SIGTERM)
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write("stopped %s" % (app,), colour=GREEN)
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return pid
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except OSError as err:
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if err.errno == errno.ESRCH:
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write("%s not running" % (app,), colour=YELLOW)
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elif err.errno == errno.EPERM:
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abort("Cannot stop %s: Operation not permitted" % (app,))
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else:
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abort("Cannot stop %s: Unknown error" % (app,))
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else:
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write(
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"No running worker of %s found (from %s)\nThe process might be managed by another controller (e.g. systemd)"
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% (app, pidfile),
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colour=YELLOW,
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)
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return None
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Worker = collections.namedtuple(
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"Worker", ["app", "configfile", "pidfile", "cache_factor", "cache_factors"]
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)
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"action",
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choices=["start", "stop", "restart"],
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help="whether to start, stop or restart the synapse",
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)
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parser.add_argument(
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"configfile",
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nargs="?",
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default="homeserver.yaml",
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help="the homeserver config file. Defaults to homeserver.yaml. May also be"
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" a directory with *.yaml files",
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)
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parser.add_argument(
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"-w", "--worker", metavar="WORKERCONFIG", help="start or stop a single worker"
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)
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parser.add_argument(
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"-a",
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"--all-processes",
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metavar="WORKERCONFIGDIR",
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help="start or stop all the workers in the given directory"
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" and the main synapse process",
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)
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parser.add_argument(
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"--no-daemonize",
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action="store_false",
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dest="daemonize",
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help="Run synapse in the foreground for debugging. "
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"Will work only if the daemonize option is not set in the config.",
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)
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options = parser.parse_args()
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if options.worker and options.all_processes:
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write('Cannot use "--worker" with "--all-processes"', stream=sys.stderr)
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sys.exit(1)
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if not options.daemonize and options.all_processes:
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write('Cannot use "--no-daemonize" with "--all-processes"', stream=sys.stderr)
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sys.exit(1)
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configfile = options.configfile
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if not os.path.exists(configfile):
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write(
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f"Config file {configfile} does not exist.\n"
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f"To generate a config file, run:\n"
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f" {sys.executable} -m {MAIN_PROCESS}"
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f" -c {configfile} --generate-config"
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f" --server-name=<server name> --report-stats=<yes/no>\n",
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stream=sys.stderr,
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)
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sys.exit(1)
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config_files = find_config_files([configfile])
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config = {}
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for config_file in config_files:
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with open(config_file) as file_stream:
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yaml_config = yaml.safe_load(file_stream)
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if yaml_config is not None:
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config.update(yaml_config)
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pidfile = config["pid_file"]
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cache_factor = config.get("synctl_cache_factor")
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start_stop_synapse = True
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if cache_factor:
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os.environ["SYNAPSE_CACHE_FACTOR"] = str(cache_factor)
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cache_factors = config.get("synctl_cache_factors", {})
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for cache_name, factor in cache_factors.items():
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os.environ["SYNAPSE_CACHE_FACTOR_" + cache_name.upper()] = str(factor)
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worker_configfiles = []
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if options.worker:
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start_stop_synapse = False
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worker_configfile = options.worker
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if not os.path.exists(worker_configfile):
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write(
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"No worker config found at %r" % (worker_configfile,), stream=sys.stderr
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)
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sys.exit(1)
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worker_configfiles.append(worker_configfile)
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if options.all_processes:
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# To start the main synapse with -a you need to add a worker file
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# with worker_app == "synapse.app.homeserver"
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start_stop_synapse = False
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worker_configdir = options.all_processes
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if not os.path.isdir(worker_configdir):
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write(
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"No worker config directory found at %r" % (worker_configdir,),
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stream=sys.stderr,
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)
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sys.exit(1)
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worker_configfiles.extend(
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sorted(glob.glob(os.path.join(worker_configdir, "*.yaml")))
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)
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workers = []
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for worker_configfile in worker_configfiles:
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with open(worker_configfile) as stream:
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worker_config = yaml.safe_load(stream)
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worker_app = worker_config["worker_app"]
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if worker_app == "synapse.app.homeserver":
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# We need to special case all of this to pick up options that may
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# be set in the main config file or in this worker config file.
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worker_pidfile = worker_config.get("pid_file") or pidfile
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worker_cache_factor = (
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worker_config.get("synctl_cache_factor") or cache_factor
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)
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worker_cache_factors = (
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worker_config.get("synctl_cache_factors") or cache_factors
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)
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# The master process doesn't support using worker_* config.
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for key in worker_config:
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if key == "worker_app": # But we allow worker_app
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continue
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assert not key.startswith(
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"worker_"
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), "Main process cannot use worker_* config"
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else:
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worker_pidfile = worker_config["worker_pid_file"]
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worker_cache_factor = worker_config.get("synctl_cache_factor")
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worker_cache_factors = worker_config.get("synctl_cache_factors", {})
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workers.append(
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Worker(
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worker_app,
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worker_configfile,
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worker_pidfile,
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worker_cache_factor,
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worker_cache_factors,
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)
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)
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action = options.action
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if action == "stop" or action == "restart":
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running_pids = []
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for worker in workers:
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pid = stop(worker.pidfile, worker.app)
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if pid is not None:
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running_pids.append(pid)
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if start_stop_synapse:
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pid = stop(pidfile, MAIN_PROCESS)
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if pid is not None:
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running_pids.append(pid)
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if len(running_pids) > 0:
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write("Waiting for processes to exit...")
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for running_pid in running_pids:
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while pid_running(running_pid):
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time.sleep(0.2)
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write("All processes exited")
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if action == "start" or action == "restart":
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error = False
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if start_stop_synapse:
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if not start(pidfile, MAIN_PROCESS, (configfile,), options.daemonize):
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error = True
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for worker in workers:
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env = os.environ.copy()
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if worker.cache_factor:
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os.environ["SYNAPSE_CACHE_FACTOR"] = str(worker.cache_factor)
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for cache_name, factor in worker.cache_factors.items():
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os.environ["SYNAPSE_CACHE_FACTOR_" + cache_name.upper()] = str(factor)
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if not start(
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worker.pidfile,
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worker.app,
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(configfile, worker.configfile),
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options.daemonize,
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):
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error = True
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# Reset env back to the original
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os.environ.clear()
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os.environ.update(env)
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if error:
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exit(1)
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if __name__ == "__main__":
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main()
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