/usr/lib/python3/dist-packages/radicale/__main__.py is in python3-radicale 1.1.1+20160115-4.
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#
# This file is part of Radicale Server - Calendar Server
# Copyright © 2011-2013 Guillaume Ayoub
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Radicale. If not, see <http://www.gnu.org/licenses/>.
"""
Radicale executable module.
This module can be executed from a command line with ``$python -m radicale`` or
from a python programme with ``radicale.__main__.run()``.
"""
import atexit
import os
import sys
import optparse
import signal
import threading
from wsgiref.simple_server import make_server
from . import (
Application, config, HTTPServer, HTTPSServer, log, RequestHandler, VERSION)
# This is a script, many branches and variables
# pylint: disable=R0912,R0914
def run():
"""Run Radicale as a standalone server."""
# Get command-line options
parser = optparse.OptionParser(version=VERSION)
parser.add_option(
"-d", "--daemon", action="store_true",
help="launch as daemon")
parser.add_option(
"-p", "--pid",
help="set PID filename for daemon mode")
parser.add_option(
"-f", "--foreground", action="store_false", dest="daemon",
help="launch in foreground (opposite of --daemon)")
parser.add_option(
"-H", "--hosts",
help="set server hostnames and ports")
parser.add_option(
"-s", "--ssl", action="store_true",
help="use SSL connection")
parser.add_option(
"-S", "--no-ssl", action="store_false", dest="ssl",
help="do not use SSL connection (opposite of --ssl)")
parser.add_option(
"-k", "--key",
help="set private key file")
parser.add_option(
"-c", "--certificate",
help="set certificate file")
parser.add_option(
"-D", "--debug", action="store_true",
help="print debug information")
parser.add_option(
"-C", "--config",
help="use a specific configuration file")
options = parser.parse_args()[0]
# Read in the configuration specified by the command line (if specified)
configuration_found = (
config.read(options.config) if options.config else True)
# Update Radicale configuration according to options
for option in parser.option_list:
key = option.dest
if key:
section = "logging" if key == "debug" else "server"
value = getattr(options, key)
if value is not None:
config.set(section, key, str(value))
# Start logging
log.start()
# Log a warning if the configuration file of the command line is not found
if not configuration_found:
log.LOGGER.warning(
"Configuration file '%s' not found" % options.config)
# Fork if Radicale is launched as daemon
if config.getboolean("server", "daemon"):
# Check and create PID file in a race-free manner
if config.get("server", "pid"):
try:
pid_fd = os.open(
config.get("server", "pid"),
os.O_CREAT | os.O_EXCL | os.O_WRONLY)
except:
raise OSError(
"PID file exists: %s" % config.get("server", "pid"))
pid = os.fork()
if pid:
sys.exit()
# Write PID
if config.get("server", "pid"):
with os.fdopen(pid_fd, "w") as pid_file:
pid_file.write(str(os.getpid()))
# Decouple environment
os.umask(0)
os.chdir("/")
os.setsid()
with open(os.devnull, "r") as null_in:
os.dup2(null_in.fileno(), sys.stdin.fileno())
with open(os.devnull, "w") as null_out:
os.dup2(null_out.fileno(), sys.stdout.fileno())
os.dup2(null_out.fileno(), sys.stderr.fileno())
# Register exit function
def cleanup():
"""Remove the PID files."""
log.LOGGER.debug("Cleaning up")
# Remove PID file
if (config.get("server", "pid") and
config.getboolean("server", "daemon")):
os.unlink(config.get("server", "pid"))
atexit.register(cleanup)
log.LOGGER.info("Starting Radicale")
# Create collection servers
servers = []
server_class = (
HTTPSServer if config.getboolean("server", "ssl") else HTTPServer)
shutdown_program = threading.Event()
for host in config.get("server", "hosts").split(","):
address, port = host.strip().rsplit(":", 1)
address, port = address.strip("[] "), int(port)
servers.append(
make_server(address, port, Application(),
server_class, RequestHandler))
# SIGTERM and SIGINT (aka KeyboardInterrupt) should just mark this for
# shutdown
signal.signal(signal.SIGTERM, lambda *_: shutdown_program.set())
signal.signal(signal.SIGINT, lambda *_: shutdown_program.set())
def serve_forever(server):
"""Serve a server forever, cleanly shutdown when things go wrong."""
try:
server.serve_forever()
finally:
shutdown_program.set()
log.LOGGER.debug(
"Base URL prefix: %s" % config.get("server", "base_prefix"))
# Start the servers in a different loop to avoid possible race-conditions,
# when a server exists but another server is added to the list at the same
# time
for server in servers:
log.LOGGER.debug(
"Listening to %s port %s" % (
server.server_name, server.server_port))
if config.getboolean("server", "ssl"):
log.LOGGER.debug("Using SSL")
threading.Thread(target=serve_forever, args=(server,)).start()
log.LOGGER.debug("Radicale server ready")
# Main loop: wait until all servers are exited
try:
# We must do the busy-waiting here, as all ``.join()`` calls completly
# block the thread, such that signals are not received
while True:
# The number is irrelevant, it only needs to be greater than 0.05
# due to python implementing its own busy-waiting logic
shutdown_program.wait(5.0)
if shutdown_program.is_set():
break
finally:
# Ignore signals, so that they cannot interfere
signal.signal(signal.SIGINT, signal.SIG_IGN)
signal.signal(signal.SIGTERM, signal.SIG_IGN)
log.LOGGER.info("Stopping Radicale")
for server in servers:
log.LOGGER.debug(
"Closing server listening to %s port %s" % (
server.server_name, server.server_port))
server.shutdown()
# pylint: enable=R0912,R0914
if __name__ == "__main__":
run()
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