summary refs log tree commit diff
path: root/synapse/_scripts/synctl.py
blob: 077b90935e2742bf7eb42f7d4ef95356d17a7647 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
#!/usr/bin/env python
# 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 typing import Iterable, NoReturn, Optional, TextIO

import yaml

from synapse.config import find_config_files

MAIN_PROCESS = "synapse.app.homeserver"

GREEN = "\x1b[1;32m"
YELLOW = "\x1b[1;33m"
RED = "\x1b[1;31m"
NORMAL = "\x1b[m"

SYNCTL_CACHE_FACTOR_WARNING = """\
Setting 'synctl_cache_factor' in the config is deprecated. Instead, please do
one of the following:
 - Either set the environment variable 'SYNAPSE_CACHE_FACTOR'
 - or set 'caches.global_factor' in the homeserver config.
--------------------------------------------------------------------------------"""


def pid_running(pid: int) -> bool:
    try:
        os.kill(pid, 0)
    except OSError as err:
        if err.errno == errno.EPERM:
            pass  # process exists
        else:
            return False

    # When running in a container, orphan processes may not get reaped and their
    # PIDs may remain valid. Try to work around the issue.
    try:
        with open(f"/proc/{pid}/status") as status_file:
            if "zombie" in status_file.read():
                return False
    except Exception:
        # This isn't Linux or `/proc/` is unavailable.
        # Assume that the process is still running.
        pass

    return True


def write(message: str, colour: str = NORMAL, stream: TextIO = sys.stdout) -> None:
    # 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: str, colour: str = RED, stream: TextIO = sys.stderr) -> NoReturn:
    write(message, colour, stream)
    sys.exit(1)


def start(pidfile: str, app: str, config_files: Iterable[str], daemonize: bool) -> bool:
    """Attempts to start a synapse main or worker process.
    Args:
        pidfile: the pidfile we expect the process to create
        app: the python module to run
        config_files: config files to pass to synapse
        daemonize: if True, will include a --daemonize argument to synapse

    Returns:
        True if the process started successfully or was already running
        False if there was an error starting the process
    """

    if os.path.exists(pidfile) and pid_running(int(open(pidfile).read())):
        print(app + " already running")
        return True

    args = [sys.executable, "-m", app]
    for c in config_files:
        args += ["-c", c]
    if daemonize:
        args.append("--daemonize")

    try:
        subprocess.check_call(args)
        write("started %s(%s)" % (app, ",".join(config_files)), colour=GREEN)
        return True
    except subprocess.CalledProcessError as e:
        err = "%s(%s) failed to start (exit code: %d). Check the Synapse logfile" % (
            app,
            ",".join(config_files),
            e.returncode,
        )
        if daemonize:
            err += ", or run synctl with --no-daemonize"
        err += "."
        write(err, colour=RED, stream=sys.stderr)
        return False


def stop(pidfile: str, app: str) -> Optional[int]:
    """Attempts to kill a synapse worker from the pidfile.
    Args:
        pidfile: path to file containing worker's pid
        app: name of the worker's appservice

    Returns:
        process id, or None if the process was not running
    """

    if os.path.exists(pidfile):
        pid = int(open(pidfile).read())
        try:
            os.kill(pid, signal.SIGTERM)
            write("stopped %s" % (app,), colour=GREEN)
            return pid
        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,))
    else:
        write(
            "No running worker of %s found (from %s)\nThe process might be managed by another controller (e.g. systemd)"
            % (app, pidfile),
            colour=YELLOW,
        )
    return None


Worker = collections.namedtuple(
    "Worker", ["app", "configfile", "pidfile", "cache_factor", "cache_factors"]
)


def main() -> None:
    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(
            f"Config file {configfile} does not exist.\n"
            f"To generate a config file, run:\n"
            f"    {sys.executable} -m {MAIN_PROCESS}"
            f" -c {configfile} --generate-config"
            f" --server-name=<server name> --report-stats=<yes/no>\n",
            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)
        if yaml_config is not None:
            config.update(yaml_config)

    pidfile = config["pid_file"]
    cache_factor = config.get("synctl_cache_factor")
    start_stop_synapse = True

    if cache_factor:
        write(SYNCTL_CACHE_FACTOR_WARNING)
        os.environ["SYNAPSE_CACHE_FACTOR"] = str(cache_factor)

    cache_factors = config.get("synctl_cache_factors", {})
    for cache_name, factor in cache_factors.items():
        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
            )
            # 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_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":
        running_pids = []
        for worker in workers:
            pid = stop(worker.pidfile, worker.app)
            if pid is not None:
                running_pids.append(pid)

        if start_stop_synapse:
            pid = stop(pidfile, MAIN_PROCESS)
            if pid is not None:
                running_pids.append(pid)

        if len(running_pids) > 0:
            write("Waiting for processes to exit...")
            for running_pid in running_pids:
                while pid_running(running_pid):
                    time.sleep(0.2)
            write("All processes exited")

    if action == "start" or action == "restart":
        error = False
        if start_stop_synapse:
            if not start(pidfile, MAIN_PROCESS, (configfile,), 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 worker.cache_factors.items():
                os.environ["SYNAPSE_CACHE_FACTOR_" + cache_name.upper()] = str(factor)

            if not start(
                worker.pidfile,
                worker.app,
                (configfile, worker.configfile),
                options.daemonize,
            ):
                error = True

            # Reset env back to the original
            os.environ.clear()
            os.environ.update(env)

        if error:
            exit(1)


if __name__ == "__main__":
    main()