mirror of
https://github.com/weewx/weewx.git
synced 2026-04-18 16:46:56 -04:00
262 lines
9.6 KiB
Python
Executable File
262 lines
9.6 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Copyright (c) 2009-2020 Tom Keffer <tkeffer@gmail.com>
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#
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# See the file LICENSE.txt for your rights.
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#
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"""Entry point to the weewx weather system."""
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from __future__ import absolute_import
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from __future__ import print_function
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import locale
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import logging
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import os
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import platform
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import signal
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import sys
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import time
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from optparse import OptionParser
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import daemon
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import weecfg
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import weedb
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from weeutil.weeutil import to_bool
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import weeutil.logger
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# First import any user extensions...
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# noinspection PyUnresolvedReferences
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import user.extensions
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# ...then import the engine
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import weewx.engine
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log = logging.getLogger(__name__)
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usagestr = """Usage: weewxd --help
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weewxd --version
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weewxd [CONFIG_FILE|--config=CONFIG_FILE]
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[--daemon] [--pidfile=PIDFILE]
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[--exit] [--loop-on-init]
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[--log-label=LABEL]
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Entry point to the weewx weather program. Can be run directly, or as a daemon
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by specifying the '--daemon' option.
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Arguments:
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CONFIG_FILE: The weewx configuration file to be used. Optional.
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"""
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# ===============================================================================
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# Main entry point
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# ===============================================================================
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def main():
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parser = OptionParser(usage=usagestr)
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parser.add_option("--config", dest="config_path", type=str,
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metavar="CONFIG_FILE",
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help="Use configuration file CONFIG_FILE.")
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parser.add_option("-d", "--daemon", action="store_true", dest="daemon", help="Run as a daemon")
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parser.add_option("-p", "--pidfile", type="string", dest="pidfile",
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help="Store the process ID in PIDFILE",
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default="/var/run/weewx.pid", metavar="PIDFILE")
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parser.add_option("-v", "--version", action="store_true", dest="version",
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help="Display version number then exit")
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parser.add_option("-x", "--exit", action="store_true", dest="exit",
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help="Exit on I/O and database errors instead of restarting")
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parser.add_option("-r", "--loop-on-init", action="store_true", dest="loop_on_init",
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help="Retry forever if device is not ready on startup")
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parser.add_option("-n", "--log-label", type="string", dest="log_label",
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help="Label to use in syslog entries",
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default="weewx", metavar="LABEL")
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# Get the command line options and arguments:
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(options, args) = parser.parse_args()
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if options.version:
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print(weewx.__version__)
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sys.exit(0)
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# Set up a minimal logging facility to be used until we read the config file.
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weeutil.logger.setup(options.log_label, {})
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if args and options.config_path:
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print("Specify CONFIG_PATH as an argument, or by using --config, not both",
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file=sys.stderr)
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sys.exit(weewx.CMD_ERROR)
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log.info("Initializing weewx version %s", weewx.__version__)
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log.info("Using Python %s", sys.version)
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log.info("Platform %s", platform.platform())
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log.info("Locale is '%s'", locale.setlocale(locale.LC_ALL))
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# Save the current working directory. A service might
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# change it. In case of a restart, we need to change it back.
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cwd = os.getcwd()
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# Make sure the system time is not out of date (a common problem with the Raspberry Pi).
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# Do this by making sure the system time is later than the creation time of this file.
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sane = os.stat(__file__).st_ctime
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n = 0
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while weewx.launchtime_ts < sane:
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# Log any problems every minute.
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if n % 120 == 0:
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log.info("Waiting for sane time. Current time is %s",
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weeutil.weeutil.timestamp_to_string(weewx.launchtime_ts))
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n += 1
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time.sleep(0.5)
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weewx.launchtime_ts = time.time()
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# Set up the signal handlers.
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signal.signal(signal.SIGHUP, sigHUPhandler)
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signal.signal(signal.SIGTERM, sigTERMhandler)
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if options.daemon:
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log.info("PID file is %s", options.pidfile)
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daemon.daemonize(pidfile=options.pidfile)
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# Main restart loop
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while True:
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os.chdir(cwd)
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# Read (or, possibly, re-read) the configuration file
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try:
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# Pass in a copy of the command line arguments. read_config() will change it.
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config_path, config_dict = weecfg.read_config(options.config_path, list(args))
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except IOError as e:
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print(e, file=sys.stderr)
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sys.exit(weewx.CMD_ERROR)
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log.info("Using configuration file %s", config_path)
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weewx.debug = int(config_dict.get('debug', 0))
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log.info("Debug is %s", weewx.debug)
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# Now that we have the config_dict and debug setting, we can customize the
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# logging with user additions
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weeutil.logger.setup(options.log_label, config_dict)
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# If no command line --loop-on-init was specified, look in the config file.
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if options.loop_on_init is None:
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loop_on_init = to_bool(config_dict.get('loop_on_init', False))
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else:
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loop_on_init = options.loop_on_init
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try:
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log.debug("Initializing engine")
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# Create and initialize the engine
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engine = weewx.engine.StdEngine(config_dict)
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log.info("Starting up weewx version %s", weewx.__version__)
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# Start the engine. It should run forever unless an exception
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# occurs. Log it if the function returns.
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engine.run()
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log.critical("Unexpected exit from main loop. Program exiting.")
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# Catch any console initialization error:
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except weewx.engine.InitializationError as e:
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# Log it:
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log.critical("Unable to load driver: %s", e)
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# See if we should loop, waiting for the console to be ready.
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# Otherwise, just exit.
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if loop_on_init:
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log.critical(" **** Waiting 60 seconds then retrying...")
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time.sleep(60)
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log.info("retrying...")
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else:
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log.critical(" **** Exiting...")
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sys.exit(weewx.IO_ERROR)
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# Catch any recoverable weewx I/O errors:
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except weewx.WeeWxIOError as e:
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# Caught an I/O error. Log it, wait 60 seconds, then try again
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log.critical("Caught WeeWxIOError: %s", e)
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if options.exit:
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log.critical(" **** Exiting...")
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sys.exit(weewx.IO_ERROR)
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log.critical(" **** Waiting 60 seconds then retrying...")
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time.sleep(60)
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log.info("retrying...")
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# Catch any database connection errors:
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except (weedb.CannotConnectError, weedb.DisconnectError) as e:
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# No connection to the database server. Log it, wait 60 seconds, then try again
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log.critical("Database connection exception: %s", e)
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if options.exit:
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log.critical(" **** Exiting...")
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sys.exit(weewx.DB_ERROR)
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log.critical(" **** Waiting 60 seconds then retrying...")
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time.sleep(60)
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log.info("retrying...")
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except weedb.OperationalError as e:
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# Caught a database error. Log it, wait 120 seconds, then try again
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log.critical("Database OperationalError exception: %s", e)
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if options.exit:
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log.critical(" **** Exiting...")
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sys.exit(weewx.DB_ERROR)
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log.critical(" **** Waiting 2 minutes then retrying...")
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time.sleep(120)
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log.info("retrying...")
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except OSError as e:
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# Caught an OS error. Log it, wait 10 seconds, then try again
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log.critical("Caught OSError: %s", e)
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weeutil.logger.log_traceback(log.critical, " **** ")
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log.critical(" **** Waiting 10 seconds then retrying...")
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time.sleep(10)
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log.info("retrying...")
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except Restart:
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log.info("Received signal HUP. Restarting.")
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except Terminate:
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log.info("Terminating weewx version %s", weewx.__version__)
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weeutil.logger.log_traceback(log.debug, " **** ")
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signal.signal(signal.SIGTERM, signal.SIG_DFL)
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os.kill(0, signal.SIGTERM)
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# Catch any keyboard interrupts and log them
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except KeyboardInterrupt:
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log.critical("Keyboard interrupt.")
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# Reraise the exception (this should cause the program to exit)
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raise
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# Catch any non-recoverable errors. Log them, exit
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except Exception as ex:
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# Caught unrecoverable error. Log it, exit
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log.critical("Caught unrecoverable exception:")
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log.critical(" **** %s" % ex)
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# Include a stack traceback in the log:
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weeutil.logger.log_traceback(log.critical, " **** ")
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log.critical(" **** Exiting.")
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# Reraise the exception (this should cause the program to exit)
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raise
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# ==============================================================================
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# Signal handlers
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# ==============================================================================
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class Restart(Exception):
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"""Exception raised when restarting the engine is desired."""
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def sigHUPhandler(_signum, _frame):
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log.info("Received signal HUP. Initiating restart.")
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raise Restart
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class Terminate(Exception):
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"""Exception raised when terminating the engine."""
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def sigTERMhandler(signum, _frame):
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log.info("Received signal TERM (%s).", signum)
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raise Terminate
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# Start up the program
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main()
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