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#!/usr/bin/env python
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# encoding: utf-8
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"""
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The ipcluster application.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import logging
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import os
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import signal
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import sys
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if os.name=='posix':
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from twisted.scripts._twistd_unix import daemonize
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from IPython.core import release
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from IPython.external import argparse
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from IPython.config.loader import ArgParseConfigLoader, NoConfigDefault
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from IPython.utils.importstring import import_item
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from IPython.kernel.clusterdir import (
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ApplicationWithClusterDir, ClusterDirError, PIDFileError
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)
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from twisted.internet import reactor
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from twisted.python import log
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#-----------------------------------------------------------------------------
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# The ipcluster application
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#-----------------------------------------------------------------------------
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# Exit codes for ipcluster
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# This will be the exit code if the ipcluster appears to be running because
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# a .pid file exists
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ALREADY_STARTED = 10
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# This will be the exit code if ipcluster stop is run, but there is not .pid
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# file to be found.
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ALREADY_STOPPED = 11
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class IPClusterCLLoader(ArgParseConfigLoader):
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def _add_arguments(self):
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# This has all the common options that all subcommands use
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parent_parser1 = argparse.ArgumentParser(add_help=False)
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parent_parser1.add_argument('--ipython-dir',
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dest='Global.ipython_dir',type=unicode,
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help='Set to override default location of Global.ipython_dir.',
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default=NoConfigDefault,
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metavar='Global.ipython_dir')
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parent_parser1.add_argument('--log-level',
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dest="Global.log_level",type=int,
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help='Set the log level (0,10,20,30,40,50). Default is 30.',
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default=NoConfigDefault,
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metavar='Global.log_level')
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# This has all the common options that other subcommands use
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parent_parser2 = argparse.ArgumentParser(add_help=False)
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parent_parser2.add_argument('-p','--profile',
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dest='Global.profile',type=unicode,
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default=NoConfigDefault,
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help='The string name of the profile to be used. This determines '
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'the name of the cluster dir as: cluster_<profile>. The default profile '
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'is named "default". The cluster directory is resolve this way '
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'if the --cluster-dir option is not used.',
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default=NoConfigDefault,
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metavar='Global.profile')
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parent_parser2.add_argument('--cluster-dir',
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dest='Global.cluster_dir',type=unicode,
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default=NoConfigDefault,
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help='Set the cluster dir. This overrides the logic used by the '
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'--profile option.',
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default=NoConfigDefault,
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metavar='Global.cluster_dir'),
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parent_parser2.add_argument('--working-dir',
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dest='Global.working_dir',type=unicode,
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help='Set the working dir for the process.',
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default=NoConfigDefault,
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metavar='Global.working_dir')
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parent_parser2.add_argument('--log-to-file',
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action='store_true', dest='Global.log_to_file',
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default=NoConfigDefault,
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help='Log to a file in the log directory (default is stdout)'
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)
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subparsers = self.parser.add_subparsers(
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dest='Global.subcommand',
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title='ipcluster subcommands',
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description='ipcluster has a variety of subcommands. '
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'The general way of running ipcluster is "ipcluster <cmd> '
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' [options]""',
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help='For more help, type "ipcluster <cmd> -h"')
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parser_list = subparsers.add_parser(
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'list',
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help='List all clusters in cwd and ipython_dir.',
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parents=[parent_parser1]
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)
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parser_create = subparsers.add_parser(
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'create',
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help='Create a new cluster directory.',
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parents=[parent_parser1, parent_parser2]
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)
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parser_create.add_argument(
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'--reset-config',
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dest='Global.reset_config', action='store_true',
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default=NoConfigDefault,
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help='Recopy the default config files to the cluster directory. '
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'You will loose any modifications you have made to these files.'
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)
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parser_start = subparsers.add_parser(
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'start',
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help='Start a cluster.',
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parents=[parent_parser1, parent_parser2]
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)
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parser_start.add_argument(
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'-n', '--number',
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type=int, dest='Global.n',
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default=NoConfigDefault,
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help='The number of engines to start.',
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metavar='Global.n'
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)
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parser_start.add_argument('--clean-logs',
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dest='Global.clean_logs', action='store_true',
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help='Delete old log flies before starting.',
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default=NoConfigDefault
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)
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parser_start.add_argument('--no-clean-logs',
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dest='Global.clean_logs', action='store_false',
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help="Don't delete old log flies before starting.",
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default=NoConfigDefault
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)
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parser_start.add_argument('--daemon',
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dest='Global.daemonize', action='store_true',
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help='Daemonize the ipcluster program. This implies --log-to-file',
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default=NoConfigDefault
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)
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parser_start.add_argument('--no-daemon',
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dest='Global.daemonize', action='store_false',
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help="Dont't daemonize the ipcluster program.",
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default=NoConfigDefault
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)
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parser_start = subparsers.add_parser(
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'stop',
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help='Stop a cluster.',
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parents=[parent_parser1, parent_parser2]
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)
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parser_start.add_argument('--signal',
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dest='Global.signal', type=int,
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help="The signal number to use in stopping the cluster (default=2).",
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metavar="Global.signal",
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default=NoConfigDefault
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)
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default_config_file_name = u'ipcluster_config.py'
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class IPClusterApp(ApplicationWithClusterDir):
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name = u'ipcluster'
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description = 'Start an IPython cluster (controller and engines).'
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config_file_name = default_config_file_name
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default_log_level = logging.INFO
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auto_create_cluster_dir = False
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def create_default_config(self):
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super(IPClusterApp, self).create_default_config()
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self.default_config.Global.controller_launcher = \
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'IPython.kernel.launcher.LocalControllerLauncher'
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self.default_config.Global.engine_launcher = \
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'IPython.kernel.launcher.LocalEngineSetLauncher'
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self.default_config.Global.n = 2
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self.default_config.Global.reset_config = False
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self.default_config.Global.clean_logs = True
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self.default_config.Global.signal = 2
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self.default_config.Global.daemonize = False
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def create_command_line_config(self):
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"""Create and return a command line config loader."""
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return IPClusterCLLoader(
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description=self.description,
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version=release.version
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)
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def find_resources(self):
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subcommand = self.command_line_config.Global.subcommand
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if subcommand=='list':
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self.list_cluster_dirs()
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# Exit immediately because there is nothing left to do.
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self.exit()
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elif subcommand=='create':
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self.auto_create_cluster_dir = True
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super(IPClusterApp, self).find_resources()
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elif subcommand=='start' or subcommand=='stop':
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self.auto_create_cluster_dir = False
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try:
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super(IPClusterApp, self).find_resources()
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except ClusterDirError:
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raise ClusterDirError(
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"Could not find a cluster directory. A cluster dir must "
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"be created before running 'ipcluster start'. Do "
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"'ipcluster create -h' or 'ipcluster list -h' for more "
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"information about creating and listing cluster dirs."
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)
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def list_cluster_dirs(self):
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# Find the search paths
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cluster_dir_paths = os.environ.get('IPCLUSTER_DIR_PATH','')
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if cluster_dir_paths:
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cluster_dir_paths = cluster_dir_paths.split(':')
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else:
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cluster_dir_paths = []
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try:
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ipython_dir = self.command_line_config.Global.ipython_dir
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except AttributeError:
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ipython_dir = self.default_config.Global.ipython_dir
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paths = [os.getcwd(), ipython_dir] + \
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cluster_dir_paths
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paths = list(set(paths))
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self.log.info('Searching for cluster dirs in paths: %r' % paths)
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for path in paths:
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files = os.listdir(path)
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for f in files:
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full_path = os.path.join(path, f)
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if os.path.isdir(full_path) and f.startswith('cluster_'):
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profile = full_path.split('_')[-1]
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start_cmd = '"ipcluster start -n 4 -p %s"' % profile
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print start_cmd + " ==> " + full_path
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def pre_construct(self):
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# This is where we cd to the working directory.
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super(IPClusterApp, self).pre_construct()
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config = self.master_config
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try:
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daemon = config.Global.daemonize
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if daemon:
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config.Global.log_to_file = True
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except AttributeError:
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pass
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def construct(self):
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config = self.master_config
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if config.Global.subcommand=='list':
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pass
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elif config.Global.subcommand=='create':
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self.log.info('Copying default config files to cluster directory '
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'[overwrite=%r]' % (config.Global.reset_config,))
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self.cluster_dir_obj.copy_all_config_files(overwrite=config.Global.reset_config)
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elif config.Global.subcommand=='start':
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self.start_logging()
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reactor.callWhenRunning(self.start_launchers)
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def start_launchers(self):
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config = self.master_config
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# Create the launchers
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el_class = import_item(config.Global.engine_launcher)
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self.engine_launcher = el_class(
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self.cluster_dir, config=config
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)
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cl_class = import_item(config.Global.controller_launcher)
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self.controller_launcher = cl_class(
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self.cluster_dir, config=config
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)
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# Setup signals
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signal.signal(signal.SIGINT, self.stop_launchers)
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# Setup the observing of stopping
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d1 = self.controller_launcher.observe_stop()
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d1.addCallback(self.stop_engines)
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d1.addErrback(self.err_and_stop)
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# If this triggers, just let them die
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# d2 = self.engine_launcher.observe_stop()
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# Start the controller and engines
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d = self.controller_launcher.start(
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profile=None, cluster_dir=config.Global.cluster_dir
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)
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d.addCallback(lambda _: self.start_engines())
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d.addErrback(self.err_and_stop)
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def err_and_stop(self, f):
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log.msg('Unexpected error in ipcluster:')
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log.err(f)
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reactor.stop()
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def stop_engines(self, r):
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return self.engine_launcher.stop()
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def start_engines(self):
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config = self.master_config
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d = self.engine_launcher.start(
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config.Global.n,
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profile=None, cluster_dir=config.Global.cluster_dir
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)
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return d
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def stop_launchers(self, signum, frame):
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log.msg("Stopping cluster")
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d1 = self.engine_launcher.stop()
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d2 = self.controller_launcher.stop()
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# d1.addCallback(lambda _: self.controller_launcher.stop)
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d1.addErrback(self.err_and_stop)
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d2.addErrback(self.err_and_stop)
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reactor.callLater(2.0, reactor.stop)
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def start_logging(self):
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# Remove old log files
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if self.master_config.Global.clean_logs:
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log_dir = self.master_config.Global.log_dir
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for f in os.listdir(log_dir):
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if f.startswith('ipengine' + '-') and f.endswith('.log'):
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os.remove(os.path.join(log_dir, f))
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for f in os.listdir(log_dir):
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if f.startswith('ipcontroller' + '-') and f.endswith('.log'):
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os.remove(os.path.join(log_dir, f))
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super(IPClusterApp, self).start_logging()
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def start_app(self):
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"""Start the application, depending on what subcommand is used."""
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subcmd = self.master_config.Global.subcommand
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if subcmd=='create' or subcmd=='list':
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return
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elif subcmd=='start':
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self.start_app_start()
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elif subcmd=='stop':
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self.start_app_stop()
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def start_app_start(self):
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"""Start the app for the start subcommand."""
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config = self.master_config
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# First see if the cluster is already running
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try:
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pid = self.get_pid_from_file()
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except PIDFileError:
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pass
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else:
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self.log.critical(
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'Cluster is already running with [pid=%s]. '
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'use "ipcluster stop" to stop the cluster.' % pid
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)
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# Here I exit with a unusual exit status that other processes
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# can watch for to learn how I existed.
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self.exit(ALREADY_STARTED)
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# Now log and daemonize
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self.log.info(
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'Starting ipcluster with [daemon=%r]' % config.Global.daemonize
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)
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if config.Global.daemonize:
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if os.name=='posix':
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daemonize()
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# Now write the new pid file AFTER our new forked pid is active.
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self.write_pid_file()
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reactor.addSystemEventTrigger('during','shutdown', self.remove_pid_file)
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reactor.run()
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def start_app_stop(self):
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"""Start the app for the stop subcommand."""
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config = self.master_config
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try:
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pid = self.get_pid_from_file()
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except PIDFileError:
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self.log.critical(
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'Problem reading pid file, cluster is probably not running.'
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)
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# Here I exit with a unusual exit status that other processes
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# can watch for to learn how I existed.
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self.exit(ALREADY_STOPPED)
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else:
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if os.name=='posix':
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sig = config.Global.signal
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self.log.info(
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"Stopping cluster [pid=%r] with [signal=%r]" % (pid, sig)
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)
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os.kill(pid, sig)
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elif os.name='nt':
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# As of right now, we don't support daemonize on Windows, so
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# stop will not do anything. Minimally, it should clean up the
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# old .pid files.
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self.remove_pid_file()
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def launch_new_instance():
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"""Create and run the IPython cluster."""
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app = IPClusterApp()
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app.start()
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if __name__ == '__main__':
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launch_new_instance()
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