Reworking how controller and engines startup in ipcluster.

I have covered more edge cases robustly:

* The engines will be shutdown if the controller dies.
* If the cluster is shutdown, but the controller or engines are already
  dead, the exit is graceful.
* The old .out and .err files created by the Windows HPC job scheduler 
  are now removed before ipcluster starts.

IPython/kernel/clusterdir.py

@@ -1,481 +1,481 b''
 #!/usr/bin/env python
 # encoding: utf-8
 """
 The IPython cluster directory
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2009  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from __future__ import with_statement
 
 import os
 import shutil
 import sys
 
 from twisted.python import log
 
 from IPython.core import release
 from IPython.config.loader import PyFileConfigLoader
 from IPython.core.application import Application
 from IPython.core.component import Component
 from IPython.config.loader import ArgParseConfigLoader, NoConfigDefault
 from IPython.utils.traitlets import Unicode, Bool
 from IPython.utils import genutils
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 
 class ClusterDirError(Exception):
     pass
 
 
 class PIDFileError(Exception):
     pass
 
 
 class ClusterDir(Component):
     """An object to manage the cluster directory and its resources.
 
     The cluster directory is used by :command:`ipcontroller`, 
     :command:`ipcontroller` and :command:`ipcontroller` to manage the
     configuration, logging and security of these applications.
 
     This object knows how to find, create and manage these directories. This
     should be used by any code that want's to handle cluster directories.
     """
 
     security_dir_name = Unicode('security')
     log_dir_name = Unicode('log')
     pid_dir_name = Unicode('pid')
     security_dir = Unicode(u'')
     log_dir = Unicode(u'')
     pid_dir = Unicode(u'')
     location = Unicode(u'')
 
     def __init__(self, location):
         super(ClusterDir, self).__init__(None)
         self.location = location
 
     def _location_changed(self, name, old, new):
         if not os.path.isdir(new):
             os.makedirs(new, mode=0777)
         else:
             os.chmod(new, 0777)
         self.security_dir = os.path.join(new, self.security_dir_name)
         self.log_dir = os.path.join(new, self.log_dir_name)
         self.pid_dir = os.path.join(new, self.pid_dir_name)
         self.check_dirs()
 
     def _log_dir_changed(self, name, old, new):
         self.check_log_dir()
 
     def check_log_dir(self):
         if not os.path.isdir(self.log_dir):
             os.mkdir(self.log_dir, 0777)
         else:
             os.chmod(self.log_dir, 0777)
 
     def _security_dir_changed(self, name, old, new):
         self.check_security_dir()
 
     def check_security_dir(self):
         if not os.path.isdir(self.security_dir):
             os.mkdir(self.security_dir, 0700)
         else:
             os.chmod(self.security_dir, 0700)
 
     def _pid_dir_changed(self, name, old, new):
         self.check_pid_dir()
 
     def check_pid_dir(self):
         if not os.path.isdir(self.pid_dir):
             os.mkdir(self.pid_dir, 0700)
         else:
             os.chmod(self.pid_dir, 0700)
 
     def check_dirs(self):
         self.check_security_dir()
         self.check_log_dir()
         self.check_pid_dir()
 
     def load_config_file(self, filename):
         """Load a config file from the top level of the cluster dir.
 
         Parameters
         ----------
         filename : unicode or str
             The filename only of the config file that must be located in
             the top-level of the cluster directory.
         """
         loader = PyFileConfigLoader(filename, self.location)
         return loader.load_config()
 
     def copy_config_file(self, config_file, path=None, overwrite=False):
         """Copy a default config file into the active cluster directory.
 
         Default configuration files are kept in :mod:`IPython.config.default`.
         This function moves these from that location to the working cluster
         directory.
         """
         if path is None:
             import IPython.config.default
             path = IPython.config.default.__file__.split(os.path.sep)[:-1]
             path = os.path.sep.join(path)
         src = os.path.join(path, config_file)
         dst = os.path.join(self.location, config_file)
         if not os.path.isfile(dst) or overwrite:
             shutil.copy(src, dst)
 
     def copy_all_config_files(self, path=None, overwrite=False):
         """Copy all config files into the active cluster directory."""
         for f in [u'ipcontroller_config.py', u'ipengine_config.py',
                   u'ipcluster_config.py']:
             self.copy_config_file(f, path=path, overwrite=overwrite)
 
     @classmethod
     def create_cluster_dir(csl, cluster_dir):
         """Create a new cluster directory given a full path.
 
         Parameters
         ----------
         cluster_dir : str
             The full path to the cluster directory.  If it does exist, it will
             be used.  If not, it will be created.
         """
         return ClusterDir(cluster_dir)
 
     @classmethod
     def create_cluster_dir_by_profile(cls, path, profile=u'default'):
         """Create a cluster dir by profile name and path.
 
         Parameters
         ----------
         path : str
             The path (directory) to put the cluster directory in.
         profile : str
             The name of the profile.  The name of the cluster directory will
             be "cluster_<profile>".
         """
         if not os.path.isdir(path):
             raise ClusterDirError('Directory not found: %s' % path)
         cluster_dir = os.path.join(path, u'cluster_' + profile)
         return ClusterDir(cluster_dir)
 
     @classmethod
     def find_cluster_dir_by_profile(cls, ipython_dir, profile=u'default'):
         """Find an existing cluster dir by profile name, return its ClusterDir.
 
         This searches through a sequence of paths for a cluster dir.  If it
         is not found, a :class:`ClusterDirError` exception will be raised.
 
         The search path algorithm is:
         1. ``os.getcwd()``
         2. ``ipython_dir``
         3. The directories found in the ":" separated 
            :env:`IPCLUSTER_DIR_PATH` environment variable.
 
         Parameters
         ----------
         ipython_dir : unicode or str
             The IPython directory to use.
         profile : unicode or str
             The name of the profile.  The name of the cluster directory
             will be "cluster_<profile>".
         """
         dirname = u'cluster_' + profile
         cluster_dir_paths = os.environ.get('IPCLUSTER_DIR_PATH','')
         if cluster_dir_paths:
             cluster_dir_paths = cluster_dir_paths.split(':')
         else:
             cluster_dir_paths = []
         paths = [os.getcwd(), ipython_dir] + cluster_dir_paths
         for p in paths:
             cluster_dir = os.path.join(p, dirname)
             if os.path.isdir(cluster_dir):
                 return ClusterDir(cluster_dir)
         else:
             raise ClusterDirError('Cluster directory not found in paths: %s' % dirname)
 
     @classmethod
     def find_cluster_dir(cls, cluster_dir):
         """Find/create a cluster dir and return its ClusterDir.
 
         This will create the cluster directory if it doesn't exist.
 
         Parameters
         ----------
         cluster_dir : unicode or str
             The path of the cluster directory.  This is expanded using
             :func:`IPython.utils.genutils.expand_path`.
         """
         cluster_dir = genutils.expand_path(cluster_dir)
         if not os.path.isdir(cluster_dir):
             raise ClusterDirError('Cluster directory not found: %s' % cluster_dir)
         return ClusterDir(cluster_dir)
 
 
 class AppWithClusterDirArgParseConfigLoader(ArgParseConfigLoader):
     """Default command line options for IPython cluster applications."""
 
     def _add_other_arguments(self):
         self.parser.add_argument('--ipython-dir', 
             dest='Global.ipython_dir',type=unicode,
             help='Set to override default location of Global.ipython_dir.',
             default=NoConfigDefault,
             metavar='Global.ipython_dir'
         )
         self.parser.add_argument('-p', '--profile',
             dest='Global.profile',type=unicode,
             help='The string name of the profile to be used. This determines '
             'the name of the cluster dir as: cluster_<profile>. The default profile '
             'is named "default".  The cluster directory is resolve this way '
             'if the --cluster-dir option is not used.',
             default=NoConfigDefault,
             metavar='Global.profile'
         )
         self.parser.add_argument('--log-level',
             dest="Global.log_level",type=int,
             help='Set the log level (0,10,20,30,40,50).  Default is 30.',
             default=NoConfigDefault,
             metavar="Global.log_level"
         )
         self.parser.add_argument('--cluster-dir',
             dest='Global.cluster_dir',type=unicode,
             help='Set the cluster dir. This overrides the logic used by the '
             '--profile option.',
             default=NoConfigDefault,
             metavar='Global.cluster_dir'
         ),
         self.parser.add_argument('--working-dir',
             dest='Global.working_dir',type=unicode,
             help='Set the working dir for the process.',
             default=NoConfigDefault,
             metavar='Global.working_dir'
         )
         self.parser.add_argument('--clean-logs',
             dest='Global.clean_logs', action='store_true',
             help='Delete old log flies before starting.',
             default=NoConfigDefault
         )
         self.parser.add_argument('--no-clean-logs',
             dest='Global.clean_logs', action='store_false',
             help="Don't Delete old log flies before starting.",
             default=NoConfigDefault
         )
 
 class ApplicationWithClusterDir(Application):
     """An application that puts everything into a cluster directory.
 
     Instead of looking for things in the ipython_dir, this type of application
     will use its own private directory called the "cluster directory"
     for things like config files, log files, etc.
 
     The cluster directory is resolved as follows:
 
     * If the ``--cluster-dir`` option is given, it is used.
     * If ``--cluster-dir`` is not given, the application directory is 
       resolve using the profile name as ``cluster_<profile>``. The search 
       path for this directory is then i) cwd if it is found there
       and ii) in ipython_dir otherwise.
 
     The config file for the application is to be put in the cluster
     dir and named the value of the ``config_file_name`` class attribute.
     """
 
     auto_create_cluster_dir = True
 
     def create_default_config(self):
         super(ApplicationWithClusterDir, self).create_default_config()
         self.default_config.Global.profile = u'default'
         self.default_config.Global.cluster_dir = u''
         self.default_config.Global.working_dir = os.getcwd()
         self.default_config.Global.log_to_file = False
         self.default_config.Global.clean_logs = False
 
     def create_command_line_config(self):
         """Create and return a command line config loader."""
         return AppWithClusterDirArgParseConfigLoader(
             description=self.description, 
             version=release.version
         )
 
     def find_resources(self):
         """This resolves the cluster directory.
 
         This tries to find the cluster directory and if successful, it will
         have done:
         * Sets ``self.cluster_dir_obj`` to the :class:`ClusterDir` object for 
           the application.
         * Sets ``self.cluster_dir`` attribute of the application and config
           objects.
 
         The algorithm used for this is as follows:
         1. Try ``Global.cluster_dir``.
         2. Try using ``Global.profile``.
         3. If both of these fail and ``self.auto_create_cluster_dir`` is
            ``True``, then create the new cluster dir in the IPython directory.
         4. If all fails, then raise :class:`ClusterDirError`.
         """
 
         try:
             cluster_dir = self.command_line_config.Global.cluster_dir
         except AttributeError:
             cluster_dir = self.default_config.Global.cluster_dir
         cluster_dir = genutils.expand_path(cluster_dir)
         try:
             self.cluster_dir_obj = ClusterDir.find_cluster_dir(cluster_dir)
         except ClusterDirError:
             pass
         else:
             self.log.info('Using existing cluster dir: %s' % \
                 self.cluster_dir_obj.location
             )
             self.finish_cluster_dir()
             return
 
         try:
             self.profile = self.command_line_config.Global.profile
         except AttributeError:
             self.profile = self.default_config.Global.profile
         try:
             self.cluster_dir_obj = ClusterDir.find_cluster_dir_by_profile(
                 self.ipython_dir, self.profile)
         except ClusterDirError:
             pass
         else:
             self.log.info('Using existing cluster dir: %s' % \
                 self.cluster_dir_obj.location
             )
             self.finish_cluster_dir()
             return
 
         if self.auto_create_cluster_dir:
             self.cluster_dir_obj = ClusterDir.create_cluster_dir_by_profile(
                 self.ipython_dir, self.profile
             )
             self.log.info('Creating new cluster dir: %s' % \
                 self.cluster_dir_obj.location
             )
             self.finish_cluster_dir()
         else:
             raise ClusterDirError('Could not find a valid cluster directory.')
 
     def finish_cluster_dir(self):
         # Set the cluster directory
         self.cluster_dir = self.cluster_dir_obj.location
         
         # These have to be set because they could be different from the one
         # that we just computed.  Because command line has the highest
         # priority, this will always end up in the master_config.
         self.default_config.Global.cluster_dir = self.cluster_dir
         self.command_line_config.Global.cluster_dir = self.cluster_dir
 
         # Set the search path to the cluster directory
         self.config_file_paths = (self.cluster_dir,)
 
     def find_config_file_name(self):
         """Find the config file name for this application."""
         # For this type of Application it should be set as a class attribute.
         if not hasattr(self, 'config_file_name'):
             self.log.critical("No config filename found")
 
     def find_config_file_paths(self):
         # Set the search path to the cluster directory
         self.config_file_paths = (self.cluster_dir,)
 
     def pre_construct(self):
         # The log and security dirs were set earlier, but here we put them
         # into the config and log them.
         config = self.master_config
         sdir = self.cluster_dir_obj.security_dir
         self.security_dir = config.Global.security_dir = sdir
         ldir = self.cluster_dir_obj.log_dir
         self.log_dir = config.Global.log_dir = ldir
         pdir = self.cluster_dir_obj.pid_dir
         self.pid_dir = config.Global.pid_dir = pdir
         self.log.info("Cluster directory set to: %s" % self.cluster_dir)
         config.Global.working_dir = unicode(genutils.expand_path(config.Global.working_dir))
         # Change to the working directory. We do this just before construct
         # is called so all the components there have the right working dir.
         self.to_working_dir()
 
     def to_working_dir(self):
         wd = self.master_config.Global.working_dir
         if unicode(wd) != unicode(os.getcwd()):
             os.chdir(wd)
             self.log.info("Changing to working dir: %s" % wd)
 
     def start_logging(self):
         # Remove old log files
         if self.master_config.Global.clean_logs:
             log_dir = self.master_config.Global.log_dir
             for f in os.listdir(log_dir):
                 if f.startswith(self.name + u'-') and f.endswith('.log'):
                     os.remove(os.path.join(log_dir, f))
         # Start logging to the new log file
         if self.master_config.Global.log_to_file:
             log_filename = self.name + u'-' + str(os.getpid()) + u'.log'
             logfile = os.path.join(self.log_dir, log_filename)
             open_log_file = open(logfile, 'w')
         else:
             open_log_file = sys.stdout
         log.startLogging(open_log_file)
 
     def write_pid_file(self, overwrite=False):
         """Create a .pid file in the pid_dir with my pid.
 
         This must be called after pre_construct, which sets `self.pid_dir`.
         This raises :exc:`PIDFileError` if the pid file exists already.
         """
         pid_file = os.path.join(self.pid_dir, self.name + u'.pid')
         if os.path.isfile(pid_file):
             pid = self.get_pid_from_file()
             if not overwrite:
                 raise PIDFileError(
                     'The pid file [%s] already exists. \nThis could mean that this '
                     'server is already running with [pid=%s].' % (pid_file, pid)
                 )
         with open(pid_file, 'w') as f:
             self.log.info("Creating pid file: %s" % pid_file)
             f.write(repr(os.getpid())+'\n')
 
     def remove_pid_file(self):
         """Remove the pid file.
 
         This should be called at shutdown by registering a callback with
-        :func:`reactor.addSystemEventTrigger`.
+        :func:`reactor.addSystemEventTrigger`. This needs to return
+        ``None``.
         """
         pid_file = os.path.join(self.pid_dir, self.name + u'.pid')
         if os.path.isfile(pid_file):
             try:
                 self.log.info("Removing pid file: %s" % pid_file)
                 os.remove(pid_file)
             except:
                 self.log.warn("Error removing the pid file: %s" % pid_file)
-                raise
 
     def get_pid_from_file(self):
         """Get the pid from the pid file.
 
         If the  pid file doesn't exist a :exc:`PIDFileError` is raised.
         """
         pid_file = os.path.join(self.pid_dir, self.name + u'.pid')
         if os.path.isfile(pid_file):
             with open(pid_file, 'r') as f:
                 pid = int(f.read().strip())
                 return pid
         else:
             raise PIDFileError('pid file not found: %s' % pid_file)
 
 

IPython/kernel/ipclusterapp.py

@@ -1,412 +1,454 b''
 #!/usr/bin/env python
 # encoding: utf-8
 """
 The ipcluster application.
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2009  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import logging
 import os
 import signal
 import sys
 
 if os.name=='posix':
     from twisted.scripts._twistd_unix import daemonize
 
 from IPython.core import release
 from IPython.external import argparse
 from IPython.config.loader import ArgParseConfigLoader, NoConfigDefault
 from IPython.utils.importstring import import_item
 
 from IPython.kernel.clusterdir import (
     ApplicationWithClusterDir, ClusterDirError, PIDFileError
 )
 
-from twisted.internet import reactor
-from twisted.python import log
+from twisted.internet import reactor, defer
+from twisted.python import log, failure
 
 
 #-----------------------------------------------------------------------------
 # The ipcluster application
 #-----------------------------------------------------------------------------
 
 
 # Exit codes for ipcluster
 
 # This will be the exit code if the ipcluster appears to be running because
 # a .pid file exists
 ALREADY_STARTED = 10
 
 # This will be the exit code if ipcluster stop is run, but there is not .pid
 # file to be found.
 ALREADY_STOPPED = 11
 
 
 class IPClusterCLLoader(ArgParseConfigLoader):
 
     def _add_arguments(self):
         # This has all the common options that all subcommands use
         parent_parser1 = argparse.ArgumentParser(add_help=False)
         parent_parser1.add_argument('--ipython-dir', 
             dest='Global.ipython_dir',type=unicode,
             help='Set to override default location of Global.ipython_dir.',
             default=NoConfigDefault,
             metavar='Global.ipython_dir')
         parent_parser1.add_argument('--log-level',
             dest="Global.log_level",type=int,
             help='Set the log level (0,10,20,30,40,50).  Default is 30.',
             default=NoConfigDefault,
             metavar='Global.log_level')
 
         # This has all the common options that other subcommands use
         parent_parser2 = argparse.ArgumentParser(add_help=False)
         parent_parser2.add_argument('-p','--profile',
             dest='Global.profile',type=unicode,
             default=NoConfigDefault,
             help='The string name of the profile to be used. This determines '
             'the name of the cluster dir as: cluster_<profile>. The default profile '
             'is named "default".  The cluster directory is resolve this way '
             'if the --cluster-dir option is not used.',
             default=NoConfigDefault,
             metavar='Global.profile')
         parent_parser2.add_argument('--cluster-dir',
             dest='Global.cluster_dir',type=unicode,
             default=NoConfigDefault,
             help='Set the cluster dir. This overrides the logic used by the '
             '--profile option.',
             default=NoConfigDefault,
             metavar='Global.cluster_dir'),
         parent_parser2.add_argument('--working-dir',
             dest='Global.working_dir',type=unicode,
             help='Set the working dir for the process.',
             default=NoConfigDefault,
             metavar='Global.working_dir')
         parent_parser2.add_argument('--log-to-file',
             action='store_true', dest='Global.log_to_file', 
             default=NoConfigDefault,
             help='Log to a file in the log directory (default is stdout)'
         )
 
         subparsers = self.parser.add_subparsers(
             dest='Global.subcommand',
             title='ipcluster subcommands',
             description='ipcluster has a variety of subcommands. '
             'The general way of running ipcluster is "ipcluster <cmd> '
             ' [options]""',
             help='For more help, type "ipcluster <cmd> -h"')
 
         parser_list = subparsers.add_parser(
             'list',
             help='List all clusters in cwd and ipython_dir.',
             parents=[parent_parser1]
         )
 
         parser_create = subparsers.add_parser(
             'create',
             help='Create a new cluster directory.',
             parents=[parent_parser1, parent_parser2] 
         )
         parser_create.add_argument(
             '--reset-config',
             dest='Global.reset_config', action='store_true',
             default=NoConfigDefault,
             help='Recopy the default config files to the cluster directory. '
             'You will loose any modifications you have made to these files.'
         )
 
         parser_start = subparsers.add_parser(
             'start',
             help='Start a cluster.',
             parents=[parent_parser1, parent_parser2]
         )
         parser_start.add_argument(
             '-n', '--number',
             type=int, dest='Global.n',
             default=NoConfigDefault,
             help='The number of engines to start.',
             metavar='Global.n'
         )
         parser_start.add_argument('--clean-logs',
             dest='Global.clean_logs', action='store_true',
             help='Delete old log flies before starting.',
             default=NoConfigDefault
         )
         parser_start.add_argument('--no-clean-logs',
             dest='Global.clean_logs', action='store_false',
             help="Don't delete old log flies before starting.",
             default=NoConfigDefault
         )
         parser_start.add_argument('--daemon',
             dest='Global.daemonize', action='store_true',
             help='Daemonize the ipcluster program. This implies --log-to-file',
             default=NoConfigDefault
         )
         parser_start.add_argument('--no-daemon',
             dest='Global.daemonize', action='store_false',
             help="Dont't daemonize the ipcluster program.",
             default=NoConfigDefault
         )
 
         parser_start = subparsers.add_parser(
             'stop',
             help='Stop a cluster.',
             parents=[parent_parser1, parent_parser2]
         )
         parser_start.add_argument('--signal',
             dest='Global.signal', type=int,
             help="The signal number to use in stopping the cluster (default=2).",
             metavar="Global.signal",
             default=NoConfigDefault
         )
 
 
 default_config_file_name = u'ipcluster_config.py'
 
 
 class IPClusterApp(ApplicationWithClusterDir):
 
     name = u'ipcluster'
     description = 'Start an IPython cluster (controller and engines).'
     config_file_name = default_config_file_name
     default_log_level = logging.INFO
     auto_create_cluster_dir = False
 
     def create_default_config(self):
         super(IPClusterApp, self).create_default_config()
         self.default_config.Global.controller_launcher = \
             'IPython.kernel.launcher.LocalControllerLauncher'
         self.default_config.Global.engine_launcher = \
             'IPython.kernel.launcher.LocalEngineSetLauncher'
         self.default_config.Global.n = 2
         self.default_config.Global.reset_config = False
         self.default_config.Global.clean_logs = True
         self.default_config.Global.signal = 2
         self.default_config.Global.daemonize = False
 
     def create_command_line_config(self):
         """Create and return a command line config loader."""
         return IPClusterCLLoader(
             description=self.description, 
             version=release.version
         )
 
     def find_resources(self):
         subcommand = self.command_line_config.Global.subcommand
         if subcommand=='list':
             self.list_cluster_dirs()
             # Exit immediately because there is nothing left to do.
             self.exit()
         elif subcommand=='create':
             self.auto_create_cluster_dir = True
             super(IPClusterApp, self).find_resources()
         elif subcommand=='start' or subcommand=='stop':
             self.auto_create_cluster_dir = False
             try:
                 super(IPClusterApp, self).find_resources()
             except ClusterDirError:
                 raise ClusterDirError(
                     "Could not find a cluster directory. A cluster dir must "
                     "be created before running 'ipcluster start'.  Do "
                     "'ipcluster create -h' or 'ipcluster list -h' for more "
                     "information about creating and listing cluster dirs."
                 )
 
     def list_cluster_dirs(self):
         # Find the search paths
         cluster_dir_paths = os.environ.get('IPCLUSTER_DIR_PATH','')
         if cluster_dir_paths:
             cluster_dir_paths = cluster_dir_paths.split(':')
         else:
             cluster_dir_paths = []
         try:
             ipython_dir = self.command_line_config.Global.ipython_dir
         except AttributeError:
             ipython_dir = self.default_config.Global.ipython_dir
         paths = [os.getcwd(), ipython_dir] + \
             cluster_dir_paths
         paths = list(set(paths))
 
         self.log.info('Searching for cluster dirs in paths: %r' % paths)
         for path in paths:
             files = os.listdir(path)
             for f in files:
                 full_path = os.path.join(path, f)
                 if os.path.isdir(full_path) and f.startswith('cluster_'):
                     profile = full_path.split('_')[-1]
                     start_cmd = '"ipcluster start -n 4 -p %s"' % profile
                     print start_cmd + " ==> " + full_path
 
     def pre_construct(self):
         # This is where we cd to the working directory.
         super(IPClusterApp, self).pre_construct()
         config = self.master_config
         try:
             daemon = config.Global.daemonize
             if daemon:
                 config.Global.log_to_file = True
         except AttributeError:
             pass
 
     def construct(self):
         config = self.master_config
         if config.Global.subcommand=='list':
             pass
         elif config.Global.subcommand=='create':
             self.log.info('Copying default config files to cluster directory '
             '[overwrite=%r]' % (config.Global.reset_config,))
             self.cluster_dir_obj.copy_all_config_files(overwrite=config.Global.reset_config)
         elif config.Global.subcommand=='start':
             self.start_logging()
             reactor.callWhenRunning(self.start_launchers)
 
     def start_launchers(self):
         config = self.master_config
 
         # Create the launchers
         el_class = import_item(config.Global.engine_launcher)
         self.engine_launcher = el_class(
             self.cluster_dir, config=config
         )
         cl_class = import_item(config.Global.controller_launcher)
         self.controller_launcher = cl_class(
             self.cluster_dir, config=config
         )
 
         # Setup signals
-        signal.signal(signal.SIGINT, self.stop_launchers)
+        signal.signal(signal.SIGINT, self.sigint_handler)
 
-        # Setup the observing of stopping
+        # Setup the observing of stopping. If the controller dies, shut
+        # everything down as that will be completely fatal for the engines.
         d1 = self.controller_launcher.observe_stop()
-        d1.addCallback(self.stop_engines)
-        d1.addErrback(self.err_and_stop)
-        # If this triggers, just let them die
-        # d2 = self.engine_launcher.observe_stop()
+        d1.addCallback(self.stop_launchers)
+        # But, we don't monitor the stopping of engines. An engine dying
+        # is just fine and in principle a user could start a new engine.
+        # Also, if we did monitor engine stopping, it is difficult to
+        # know what to do when only some engines die. Currently, the
+        # observing of engine stopping is inconsistent. Some launchers
+        # might trigger on a single engine stopping, other wait until
+        # all stop.  TODO: think more about how to handle this.
         
         # Start the controller and engines
+        self._stopping = False  # Make sure stop_launchers is not called 2x.
+        d = self.start_controller()
+        d.addCallback(self.start_engines)
+        d.addCallback(self.startup_message)
+        # If the controller or engines fail to start, stop everything
+        d.addErrback(self.stop_launchers)
+        return d
+
+    def startup_message(self, r=None):
+        log.msg("IPython cluster: started")
+        return r
+        
+    def start_controller(self, r=None):
+        # log.msg("In start_controller")
+        config = self.master_config
         d = self.controller_launcher.start(
             cluster_dir=config.Global.cluster_dir
         )
-        d.addCallback(lambda _: self.start_engines())
-        d.addErrback(self.err_and_stop)
-
-    def err_and_stop(self, f):
-        log.msg('Unexpected error in ipcluster:')
-        log.err(f)
-        reactor.stop()
-
-    def stop_engines(self, r):
-        return self.engine_launcher.stop()
-
-    def start_engines(self):
+        return d
+            
+    def start_engines(self, r=None):
+        # log.msg("In start_engines")
         config = self.master_config
         d = self.engine_launcher.start(
             config.Global.n,
             cluster_dir=config.Global.cluster_dir
         )
         return d
 
-    def stop_launchers(self, signum, frame):
-        log.msg("Stopping cluster")
-        d1 = self.engine_launcher.stop()
-        d2 = self.controller_launcher.stop()
-        # d1.addCallback(lambda _: self.controller_launcher.stop)
-        d1.addErrback(self.err_and_stop)
-        d2.addErrback(self.err_and_stop)
-        reactor.callLater(2.0, reactor.stop)
+    def stop_controller(self, r=None):
+        # log.msg("In stop_controller")
+        if self.controller_launcher.running:
+            d = self.controller_launcher.stop()
+            d.addErrback(self.log_err)
+            return d
+        else:
+            return defer.succeed(None)
+
+    def stop_engines(self, r=None):
+        # log.msg("In stop_engines")
+        if self.engine_launcher.running:
+            d = self.engine_launcher.stop()
+            d.addErrback(self.log_err)
+            return d
+        else:
+            return defer.succeed(None)
 
+    def log_err(self, f):
+        log.msg(f.getTraceback())
+        return None
+        
+    def stop_launchers(self, r=None):
+        if not self._stopping:
+            self._stopping = True
+            if isinstance(r, failure.Failure):
+                log.msg('Unexpected error in ipcluster:')
+                log.msg(r.getTraceback())
+            log.msg("IPython cluster: stopping")
+            d= self.stop_engines()
+            d2 = self.stop_controller()
+            # Wait a few seconds to let things shut down.
+            reactor.callLater(3.0, reactor.stop)
+
+    def sigint_handler(self, signum, frame):
+        self.stop_launchers()
+        
     def start_logging(self):
-        # Remove old log files
+        # Remove old log files of the controller and engine
         if self.master_config.Global.clean_logs:
             log_dir = self.master_config.Global.log_dir
             for f in os.listdir(log_dir):
-                if f.startswith('ipengine' + '-') and f.endswith('.log'):
-                    os.remove(os.path.join(log_dir, f))
-            for f in os.listdir(log_dir):
-                if f.startswith('ipcontroller' + '-') and f.endswith('.log'):
-                    os.remove(os.path.join(log_dir, f))
+                if f.startswith('ipengine' + '-'):
+                    if f.endswith('.log') or f.endswith('.out') or f.endswith('.err'):
+                        os.remove(os.path.join(log_dir, f))
+                if f.startswith('ipcontroller' + '-'):
+                    if f.endswith('.log') or f.endswith('.out') or f.endswith('.err'):
+                        os.remove(os.path.join(log_dir, f))
+        # This will remote old log files for ipcluster itself
         super(IPClusterApp, self).start_logging()
 
     def start_app(self):
         """Start the application, depending on what subcommand is used."""
         subcmd = self.master_config.Global.subcommand
         if subcmd=='create' or subcmd=='list':
             return
         elif subcmd=='start':
             self.start_app_start()
         elif subcmd=='stop':
             self.start_app_stop()
 
     def start_app_start(self):
         """Start the app for the start subcommand."""
         config = self.master_config
         # First see if the cluster is already running
         try:
             pid = self.get_pid_from_file()
         except PIDFileError:
             pass
         else:
             self.log.critical(
                 'Cluster is already running with [pid=%s]. '
                 'use "ipcluster stop" to stop the cluster.' % pid
             )
             # Here I exit with a unusual exit status that other processes
             # can watch for to learn how I existed.
             self.exit(ALREADY_STARTED)
 
         # Now log and daemonize
         self.log.info(
             'Starting ipcluster with [daemon=%r]' % config.Global.daemonize
         )
         if config.Global.daemonize:
             if os.name=='posix':
                 daemonize()
 
         # Now write the new pid file AFTER our new forked pid is active.
         self.write_pid_file()
         reactor.addSystemEventTrigger('during','shutdown', self.remove_pid_file)
         reactor.run()
 
     def start_app_stop(self):
         """Start the app for the stop subcommand."""
         config = self.master_config
         try:
             pid = self.get_pid_from_file()
         except PIDFileError:
             self.log.critical(
                 'Problem reading pid file, cluster is probably not running.'
             )
             # Here I exit with a unusual exit status that other processes
             # can watch for to learn how I existed.
             self.exit(ALREADY_STOPPED)
         else:
             if os.name=='posix':
                 sig = config.Global.signal
                 self.log.info(
                     "Stopping cluster [pid=%r] with [signal=%r]" % (pid, sig)
                 )
                 os.kill(pid, sig)
             elif os.name=='nt':
                 # As of right now, we don't support daemonize on Windows, so
                 # stop will not do anything. Minimally, it should clean up the
                 # old .pid files.
                 self.remove_pid_file()
 
 def launch_new_instance():
     """Create and run the IPython cluster."""
     app = IPClusterApp()
     app.start()
 
 
 if __name__ == '__main__':
     launch_new_instance()
 

IPython/kernel/winhpcjob.py

@@ -1,306 +1,318 b''
 #!/usr/bin/env python
 # encoding: utf-8
 """
 Job and task components for writing .xml files that the Windows HPC Server 
 2008 can use to start jobs.
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2009  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from __future__ import with_statement
 
 import os
 import re
 import uuid
 
 from xml.etree import ElementTree as ET
 from xml.dom import minidom
 
 from IPython.core.component import Component
 from IPython.external import Itpl
 from IPython.utils.traitlets import (
     Str, Int, List, Unicode, Instance,
     Enum, Bool, CStr
 )
 
 #-----------------------------------------------------------------------------
 # Job and Task Component
 #-----------------------------------------------------------------------------
 
 
 def as_str(value):
     if isinstance(value, str):
         return value
     elif isinstance(value, bool):
         if value:
             return 'true'
         else:
             return 'false'
     elif isinstance(value, (int, float)):
         return repr(value)
     else:
         return value
 
 
 def indent(elem, level=0):
     i = "\n" + level*"  "
     if len(elem):
         if not elem.text or not elem.text.strip():
             elem.text = i + "  "
         if not elem.tail or not elem.tail.strip():
             elem.tail = i
         for elem in elem:
             indent(elem, level+1)
         if not elem.tail or not elem.tail.strip():
             elem.tail = i
     else:
         if level and (not elem.tail or not elem.tail.strip()):
             elem.tail = i
 
 
 def find_username():
     domain = os.environ.get('USERDOMAIN')
     username = os.environ.get('USERNAME','')
     if domain is None:
         return username
     else:
         return '%s\\%s' % (domain, username)
 
 
 class WinHPCJob(Component):
 
     job_id = Str('')
     job_name = Str('MyJob', config=True)
     min_cores = Int(1, config=True)
     max_cores = Int(1, config=True)
     min_sockets = Int(1, config=True)
     max_sockets = Int(1, config=True)
     min_nodes = Int(1, config=True)
     max_nodes = Int(1, config=True)
     unit_type = Str("Core", config=True)
     auto_calculate_min = Bool(True, config=True)
     auto_calculate_max = Bool(True, config=True)
     run_until_canceled = Bool(False, config=True)
     is_exclusive = Bool(False, config=True)
     username = Str(find_username(), config=True)
     job_type = Str('Batch', config=True)
     priority = Enum(('Lowest','BelowNormal','Normal','AboveNormal','Highest'),
         default_value='Highest', config=True)
     requested_nodes = Str('', config=True)
     project = Str('IPython', config=True)
     xmlns = Str('http://schemas.microsoft.com/HPCS2008/scheduler/')
     version = Str("2.000")
     tasks = List([])
 
     @property
     def owner(self):
         return self.username
 
     def _write_attr(self, root, attr, key):
         s = as_str(getattr(self, attr, ''))
         if s:
             root.set(key, s)
 
     def as_element(self):
         # We have to add _A_ type things to get the right order than
         # the MSFT XML parser expects.
         root = ET.Element('Job')
         self._write_attr(root, 'version', '_A_Version')
         self._write_attr(root, 'job_name', '_B_Name')
         self._write_attr(root, 'unit_type', '_C_UnitType')
         self._write_attr(root, 'min_cores', '_D_MinCores')
         self._write_attr(root, 'max_cores', '_E_MaxCores')
         self._write_attr(root, 'min_sockets', '_F_MinSockets')
         self._write_attr(root, 'max_sockets', '_G_MaxSockets')
         self._write_attr(root, 'min_nodes', '_H_MinNodes')
         self._write_attr(root, 'max_nodes', '_I_MaxNodes')
         self._write_attr(root, 'run_until_canceled', '_J_RunUntilCanceled')
         self._write_attr(root, 'is_exclusive', '_K_IsExclusive')
         self._write_attr(root, 'username', '_L_UserName')
         self._write_attr(root, 'job_type', '_M_JobType')
         self._write_attr(root, 'priority', '_N_Priority')
         self._write_attr(root, 'requested_nodes', '_O_RequestedNodes')
         self._write_attr(root, 'auto_calculate_max', '_P_AutoCalculateMax')
         self._write_attr(root, 'auto_calculate_min', '_Q_AutoCalculateMin')
         self._write_attr(root, 'project', '_R_Project')
         self._write_attr(root, 'owner', '_S_Owner')
         self._write_attr(root, 'xmlns', '_T_xmlns')
         dependencies = ET.SubElement(root, "Dependencies")
         etasks = ET.SubElement(root, "Tasks")
         for t in self.tasks:
             etasks.append(t.as_element())
         return root
 
     def tostring(self):
         """Return the string representation of the job description XML."""
         root = self.as_element()
         indent(root)
         txt = ET.tostring(root, encoding="utf-8")
         # Now remove the tokens used to order the attributes.
         txt = re.sub(r'_[A-Z]_','',txt)
         txt = '<?xml version="1.0" encoding="utf-8"?>\n' + txt
         return txt
 
     def write(self, filename):
         """Write the XML job description to a file."""
         txt = self.tostring()
         with open(filename, 'w') as f:
             f.write(txt)
 
     def add_task(self, task):
         """Add a task to the job.
 
         Parameters
         ----------
         task : :class:`WinHPCTask`
             The task object to add.
         """
         self.tasks.append(task)
 
 
 class WinHPCTask(Component):
 
     task_id = Str('')
     task_name = Str('')
     version = Str("2.000")
     min_cores = Int(1, config=True)
     max_cores = Int(1, config=True)
     min_sockets = Int(1, config=True)
     max_sockets = Int(1, config=True)
     min_nodes = Int(1, config=True)
     max_nodes = Int(1, config=True)
     unit_type = Str("Core", config=True)
     command_line = CStr('', config=True)
     work_directory = CStr('', config=True)
     is_rerunnaable = Bool(True, config=True)
     std_out_file_path = CStr('', config=True)
     std_err_file_path = CStr('', config=True)
     is_parametric = Bool(False, config=True)
     environment_variables = Instance(dict, args=(), config=True)
 
     def _write_attr(self, root, attr, key):
         s = as_str(getattr(self, attr, ''))
         if s:
             root.set(key, s)
 
     def as_element(self):
         root = ET.Element('Task')
         self._write_attr(root, 'version', '_A_Version')
         self._write_attr(root, 'task_name', '_B_Name')
         self._write_attr(root, 'min_cores', '_C_MinCores')
         self._write_attr(root, 'max_cores', '_D_MaxCores')
         self._write_attr(root, 'min_sockets', '_E_MinSockets')
         self._write_attr(root, 'max_sockets', '_F_MaxSockets')
         self._write_attr(root, 'min_nodes', '_G_MinNodes')
         self._write_attr(root, 'max_nodes', '_H_MaxNodes')
         self._write_attr(root, 'command_line', '_I_CommandLine')
         self._write_attr(root, 'work_directory', '_J_WorkDirectory')
         self._write_attr(root, 'is_rerunnaable', '_K_IsRerunnable')
         self._write_attr(root, 'std_out_file_path', '_L_StdOutFilePath')
         self._write_attr(root, 'std_err_file_path', '_M_StdErrFilePath')
         self._write_attr(root, 'is_parametric', '_N_IsParametric')
         self._write_attr(root, 'unit_type', '_O_UnitType')
         root.append(self.get_env_vars())
         return root
 
     def get_env_vars(self):
         env_vars = ET.Element('EnvironmentVariables')
         for k, v in self.environment_variables.items():
             variable = ET.SubElement(env_vars, "Variable")
             name = ET.SubElement(variable, "Name")
             name.text = k
             value = ET.SubElement(variable, "Value")
             value.text = v
         return env_vars
 
 
 
 # By declaring these, we can configure the controller and engine separately!
 
 class IPControllerJob(WinHPCJob):
     job_name = Str('IPController', config=False)
     is_exclusive = Bool(False, config=True)
     username = Str(find_username(), config=True)
     priority = Enum(('Lowest','BelowNormal','Normal','AboveNormal','Highest'),
         default_value='Highest', config=True)
     requested_nodes = Str('', config=True)
     project = Str('IPython', config=True)
 
 
 class IPEngineSetJob(WinHPCJob):
     job_name = Str('IPEngineSet', config=False)
     is_exclusive = Bool(False, config=True)
     username = Str(find_username(), config=True)
     priority = Enum(('Lowest','BelowNormal','Normal','AboveNormal','Highest'),
         default_value='Highest', config=True)
     requested_nodes = Str('', config=True)
     project = Str('IPython', config=True)
 
 
 class IPControllerTask(WinHPCTask):
 
     task_name = Str('IPController', config=True)
     controller_cmd = List(['ipcontroller.exe'], config=True)
     controller_args = List(['--log-to-file', '--log-level', '40'], config=True)
     # I don't want these to be configurable
-    std_out_file_path = CStr(os.path.join('log','ipcontroller-out.txt'), config=False)
-    std_err_file_path = CStr(os.path.join('log','ipcontroller-err.txt'), config=False)
+    std_out_file_path = CStr('', config=False)
+    std_err_file_path = CStr('', config=False)
     min_cores = Int(1, config=False)
     max_cores = Int(1, config=False)
     min_sockets = Int(1, config=False)
     max_sockets = Int(1, config=False)
     min_nodes = Int(1, config=False)
     max_nodes = Int(1, config=False)
     unit_type = Str("Core", config=False)
     work_directory = CStr('', config=False)
 
+    def __init__(self, parent, name=None, config=None):
+        super(IPControllerTask, self).__init__(parent, name, config)
+        the_uuid = uuid.uuid1()
+        self.std_out_file_path = os.path.join('log','ipcontroller-%s.out' % the_uuid)
+        self.std_err_file_path = os.path.join('log','ipcontroller-%s.err' % the_uuid)
+
     @property
     def command_line(self):
         return ' '.join(self.controller_cmd + self.controller_args)
 
 
 class IPEngineTask(WinHPCTask):
 
     task_name = Str('IPEngine', config=True)
     engine_cmd = List(['ipengine.exe'], config=True)
     engine_args = List(['--log-to-file', '--log-level', '40'], config=True)
     # I don't want these to be configurable
-    std_out_file_path = CStr(os.path.join('log','ipengine-out-%s.txt' % uuid.uuid1()), config=False)
-    std_err_file_path = CStr(os.path.join('log','ipengine-err-%s.txt' % uuid.uuid1()), config=False)
+    std_out_file_path = CStr('', config=False)
+    std_err_file_path = CStr('', config=False)
     min_cores = Int(1, config=False)
     max_cores = Int(1, config=False)
     min_sockets = Int(1, config=False)
     max_sockets = Int(1, config=False)
     min_nodes = Int(1, config=False)
     max_nodes = Int(1, config=False)
     unit_type = Str("Core", config=False)
     work_directory = CStr('', config=False)
 
+    def __init__(self, parent, name=None, config=None):
+        super(IPEngineTask,self).__init__(parent, name, config)
+        the_uuid = uuid.uuid1()
+        self.std_out_file_path = os.path.join('log','ipengine-%s.out' % the_uuid)
+        self.std_err_file_path = os.path.join('log','ipengine-%s.err' % the_uuid)
+    
     @property
     def command_line(self):
         return ' '.join(self.engine_cmd + self.engine_args)
 
 
 # j = WinHPCJob(None)
 # j.job_name = 'IPCluster'
 # j.username = 'GNET\\bgranger'
 # j.requested_nodes = 'GREEN'
 # 
 # t = WinHPCTask(None)
 # t.task_name = 'Controller'
 # t.command_line = r"\\blue\domainusers$\bgranger\Python\Python25\Scripts\ipcontroller.exe --log-to-file -p default --log-level 10"
 # t.work_directory = r"\\blue\domainusers$\bgranger\.ipython\cluster_default"
 # t.std_out_file_path = 'controller-out.txt'
 # t.std_err_file_path = 'controller-err.txt'
 # t.environment_variables['PYTHONPATH'] = r"\\blue\domainusers$\bgranger\Python\Python25\Lib\site-packages"
 # j.add_task(t)