#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import argparse
import collections
import errno
import glob
import os
import os.path
import signal
import subprocess
import sys
import time
from six import iteritems
import yaml
from synapse.config import find_config_files
SYNAPSE = [sys.executable, "-B", "-m", "synapse.app.homeserver"]
GREEN = "\x1b[1;32m"
YELLOW = "\x1b[1;33m"
RED = "\x1b[1;31m"
NORMAL = "\x1b[m"
def pid_running(pid):
try:
os.kill(pid, 0)
return True
except OSError as err:
if err.errno == errno.EPERM:
return True
return False
def write(message, colour=NORMAL, stream=sys.stdout):
# Lets check if we're writing to a TTY before colouring
should_colour = False
try:
should_colour = stream.isatty()
except AttributeError:
# Just in case `isatty` isn't defined on everything. The python
# docs are incredibly vague.
pass
if not should_colour:
stream.write(message + "\n")
else:
stream.write(colour + message + NORMAL + "\n")
def abort(message, colour=RED, stream=sys.stderr):
write(message, colour, stream)
sys.exit(1)
def start(configfile: str, daemonize: bool = True) -> bool:
"""Attempts to start synapse.
Args:
configfile: path to a yaml synapse config file
daemonize: whether to daemonize synapse or keep it attached to the current
session
Returns:
True if the process started successfully
False if there was an error starting the process
If deamonize is False it will only return once synapse exits.
"""
write("Starting ...")
args = SYNAPSE
if daemonize:
args.extend(["--daemonize", "-c", configfile])
else:
args.extend(["-c", configfile])
try:
subprocess.check_call(args)
write("started synapse.app.homeserver(%r)" % (configfile,), colour=GREEN)
return True
except subprocess.CalledProcessError as e:
write(
"error starting (exit code: %d); see above for logs" % e.returncode,
colour=RED,
)
return False
def start_worker(app: str, configfile: str, worker_configfile: str) -> bool:
"""Attempts to start a synapse worker.
Args:
app: name of the worker's appservice
configfile: path to a yaml synapse config file
worker_configfile: path to worker specific yaml synapse file
Returns:
True if the process started successfully
False if there was an error starting the process
"""
args = [sys.executable, "-B", "-m", app, "-c", configfile, "-c", worker_configfile]
try:
subprocess.check_call(args)
write("started %s(%r)" % (app, worker_configfile), colour=GREEN)
return True
except subprocess.CalledProcessError as e:
write(
"error starting %s(%r) (exit code: %d); see above for logs"
% (app, worker_configfile, e.returncode),
colour=RED,
)
return False
def stop(pidfile, app):
if os.path.exists(pidfile):
pid = int(open(pidfile).read())
try:
os.kill(pid, signal.SIGTERM)
write("stopped %s" % (app,), colour=GREEN)
except OSError as err:
if err.errno == errno.ESRCH:
write("%s not running" % (app,), colour=YELLOW)
elif err.errno == errno.EPERM:
abort("Cannot stop %s: Operation not permitted" % (app,))
else:
abort("Cannot stop %s: Unknown error" % (app,))
Worker = collections.namedtuple(
"Worker", ["app", "configfile", "pidfile", "cache_factor", "cache_factors"]
)
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
"action",
choices=["start", "stop", "restart"],
help="whether to start, stop or restart the synapse",
)
parser.add_argument(
"configfile",
nargs="?",
default="homeserver.yaml",
help="the homeserver config file. Defaults to homeserver.yaml. May also be"
" a directory with *.yaml files",
)
parser.add_argument(
"-w", "--worker", metavar="WORKERCONFIG", help="start or stop a single worker"
)
parser.add_argument(
"-a",
"--all-processes",
metavar="WORKERCONFIGDIR",
help="start or stop all the workers in the given directory"
" and the main synapse process",
)
parser.add_argument(
"--no-daemonize",
action="store_false",
dest="daemonize",
help="Run synapse in the foreground for debugging. "
"Will work only if the daemonize option is not set in the config.",
)
options = parser.parse_args()
if options.worker and options.all_processes:
write('Cannot use "--worker" with "--all-processes"', stream=sys.stderr)
sys.exit(1)
if not options.daemonize and options.all_processes:
write('Cannot use "--no-daemonize" with "--all-processes"', stream=sys.stderr)
sys.exit(1)
configfile = options.configfile
if not os.path.exists(configfile):
write(
"No config file found\n"
"To generate a config file, run '%s -c %s --generate-config"
" --server-name=<server name> --report-stats=<yes/no>'\n"
% (" ".join(SYNAPSE), options.configfile),
stream=sys.stderr,
)
sys.exit(1)
config_files = find_config_files([configfile])
config = {}
for config_file in config_files:
with open(config_file) as file_stream:
yaml_config = yaml.safe_load(file_stream)
config.update(yaml_config)
pidfile = config["pid_file"]
cache_factor = config.get("synctl_cache_factor")
start_stop_synapse = True
if cache_factor:
os.environ["SYNAPSE_CACHE_FACTOR"] = str(cache_factor)
cache_factors = config.get("synctl_cache_factors", {})
for cache_name, factor in iteritems(cache_factors):
os.environ["SYNAPSE_CACHE_FACTOR_" + cache_name.upper()] = str(factor)
worker_configfiles = []
if options.worker:
start_stop_synapse = False
worker_configfile = options.worker
if not os.path.exists(worker_configfile):
write(
"No worker config found at %r" % (worker_configfile,), stream=sys.stderr
)
sys.exit(1)
worker_configfiles.append(worker_configfile)
if options.all_processes:
# To start the main synapse with -a you need to add a worker file
# with worker_app == "synapse.app.homeserver"
start_stop_synapse = False
worker_configdir = options.all_processes
if not os.path.isdir(worker_configdir):
write(
"No worker config directory found at %r" % (worker_configdir,),
stream=sys.stderr,
)
sys.exit(1)
worker_configfiles.extend(
sorted(glob.glob(os.path.join(worker_configdir, "*.yaml")))
)
workers = []
for worker_configfile in worker_configfiles:
with open(worker_configfile) as stream:
worker_config = yaml.safe_load(stream)
worker_app = worker_config["worker_app"]
if worker_app == "synapse.app.homeserver":
# We need to special case all of this to pick up options that may
# be set in the main config file or in this worker config file.
worker_pidfile = worker_config.get("pid_file") or pidfile
worker_cache_factor = (
worker_config.get("synctl_cache_factor") or cache_factor
)
worker_cache_factors = (
worker_config.get("synctl_cache_factors") or cache_factors
)
daemonize = worker_config.get("daemonize") or config.get("daemonize")
assert daemonize, "Main process must have daemonize set to true"
# The master process doesn't support using worker_* config.
for key in worker_config:
if key == "worker_app": # But we allow worker_app
continue
assert not key.startswith(
"worker_"
), "Main process cannot use worker_* config"
else:
worker_pidfile = worker_config["worker_pid_file"]
worker_daemonize = worker_config["worker_daemonize"]
assert worker_daemonize, "In config %r: expected '%s' to be True" % (
worker_configfile,
"worker_daemonize",
)
worker_cache_factor = worker_config.get("synctl_cache_factor")
worker_cache_factors = worker_config.get("synctl_cache_factors", {})
workers.append(
Worker(
worker_app,
worker_configfile,
worker_pidfile,
worker_cache_factor,
worker_cache_factors,
)
)
action = options.action
if action == "stop" or action == "restart":
for worker in workers:
stop(worker.pidfile, worker.app)
if start_stop_synapse:
stop(pidfile, "synapse.app.homeserver")
# Wait for synapse to actually shutdown before starting it again
if action == "restart":
running_pids = []
if start_stop_synapse and os.path.exists(pidfile):
running_pids.append(int(open(pidfile).read()))
for worker in workers:
if os.path.exists(worker.pidfile):
running_pids.append(int(open(worker.pidfile).read()))
if len(running_pids) > 0:
write("Waiting for process to exit before restarting...")
for running_pid in running_pids:
while pid_running(running_pid):
time.sleep(0.2)
write("All processes exited; now restarting...")
if action == "start" or action == "restart":
error = False
if start_stop_synapse:
# Check if synapse is already running
if os.path.exists(pidfile) and pid_running(int(open(pidfile).read())):
abort("synapse.app.homeserver already running")
if not start(configfile, bool(options.daemonize)):
error = True
for worker in workers:
env = os.environ.copy()
if worker.cache_factor:
os.environ["SYNAPSE_CACHE_FACTOR"] = str(worker.cache_factor)
for cache_name, factor in iteritems(worker.cache_factors):
os.environ["SYNAPSE_CACHE_FACTOR_" + cache_name.upper()] = str(factor)
if not start_worker(worker.app, configfile, worker.configfile):
error = True
# Reset env back to the original
os.environ.clear()
os.environ.update(env)
if error:
exit(1)
if __name__ == "__main__":
main()