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# encoding: utf-8
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"""
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The Base Application class for IPython.parallel apps
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Authors:
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* Brian Granger
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* Min RK
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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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from __future__ import with_statement
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import os
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import logging
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import re
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import sys
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from subprocess import Popen, PIPE
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from IPython.core import release
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from IPython.core.crashhandler import CrashHandler
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from IPython.core.application import (
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BaseIPythonApplication,
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base_aliases as base_ip_aliases,
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base_flags as base_ip_flags
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)
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from IPython.utils.path import expand_path
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from IPython.utils.traitlets import Unicode, Bool, Instance, Dict, List
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#-----------------------------------------------------------------------------
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# Module errors
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#-----------------------------------------------------------------------------
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class PIDFileError(Exception):
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pass
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#-----------------------------------------------------------------------------
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# Crash handler for this application
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#-----------------------------------------------------------------------------
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class ParallelCrashHandler(CrashHandler):
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"""sys.excepthook for IPython itself, leaves a detailed report on disk."""
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def __init__(self, app):
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contact_name = release.authors['Min'][0]
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contact_email = release.authors['Min'][1]
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bug_tracker = 'http://github.com/ipython/ipython/issues'
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super(ParallelCrashHandler,self).__init__(
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app, contact_name, contact_email, bug_tracker
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)
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#-----------------------------------------------------------------------------
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# Main application
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#-----------------------------------------------------------------------------
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base_aliases = {}
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base_aliases.update(base_ip_aliases)
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base_aliases.update({
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'profile-dir' : 'ProfileDir.location',
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'work-dir' : 'BaseParallelApplication.work_dir',
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'log-to-file' : 'BaseParallelApplication.log_to_file',
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'clean-logs' : 'BaseParallelApplication.clean_logs',
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'log-url' : 'BaseParallelApplication.log_url',
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})
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base_flags = {
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'log-to-file' : (
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{'BaseParallelApplication' : {'log_to_file' : True}},
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"send log output to a file"
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)
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}
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base_flags.update(base_ip_flags)
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class BaseParallelApplication(BaseIPythonApplication):
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"""The base Application for IPython.parallel apps
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Principle extensions to BaseIPyythonApplication:
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* work_dir
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* remote logging via pyzmq
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* IOLoop instance
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"""
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crash_handler_class = ParallelCrashHandler
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def _log_level_default(self):
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# temporarily override default_log_level to INFO
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return logging.INFO
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work_dir = Unicode(os.getcwdu(), config=True,
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help='Set the working dir for the process.'
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)
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def _work_dir_changed(self, name, old, new):
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self.work_dir = unicode(expand_path(new))
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log_to_file = Bool(config=True,
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help="whether to log to a file")
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clean_logs = Bool(False, config=True,
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help="whether to cleanup old logfiles before starting")
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log_url = Unicode('', config=True,
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help="The ZMQ URL of the iplogger to aggregate logging.")
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def _config_files_default(self):
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return ['ipcontroller_config.py', 'ipengine_config.py', 'ipcluster_config.py']
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loop = Instance('zmq.eventloop.ioloop.IOLoop')
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def _loop_default(self):
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from zmq.eventloop.ioloop import IOLoop
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return IOLoop.instance()
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aliases = Dict(base_aliases)
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flags = Dict(base_flags)
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def initialize(self, argv=None):
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"""initialize the app"""
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super(BaseParallelApplication, self).initialize(argv)
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self.to_work_dir()
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self.reinit_logging()
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def to_work_dir(self):
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wd = self.work_dir
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if unicode(wd) != os.getcwdu():
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os.chdir(wd)
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self.log.info("Changing to working dir: %s" % wd)
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# This is the working dir by now.
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sys.path.insert(0, '')
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def reinit_logging(self):
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# Remove old log files
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log_dir = self.profile_dir.log_dir
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if self.clean_logs:
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for f in os.listdir(log_dir):
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if re.match(r'%s-\d+\.(log|err|out)'%self.name,f):
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os.remove(os.path.join(log_dir, f))
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if self.log_to_file:
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# Start logging to the new log file
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log_filename = self.name + u'-' + str(os.getpid()) + u'.log'
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logfile = os.path.join(log_dir, log_filename)
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open_log_file = open(logfile, 'w')
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else:
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open_log_file = None
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if open_log_file is not None:
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self.log.removeHandler(self._log_handler)
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self._log_handler = logging.StreamHandler(open_log_file)
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self._log_formatter = logging.Formatter("[%(name)s] %(message)s")
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self._log_handler.setFormatter(self._log_formatter)
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self.log.addHandler(self._log_handler)
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def write_pid_file(self, overwrite=False):
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"""Create a .pid file in the pid_dir with my pid.
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This must be called after pre_construct, which sets `self.pid_dir`.
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This raises :exc:`PIDFileError` if the pid file exists already.
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"""
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pid_file = os.path.join(self.profile_dir.pid_dir, self.name + u'.pid')
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if os.path.isfile(pid_file):
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pid = self.get_pid_from_file()
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if not overwrite:
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raise PIDFileError(
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'The pid file [%s] already exists. \nThis could mean that this '
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'server is already running with [pid=%s].' % (pid_file, pid)
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)
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with open(pid_file, 'w') as f:
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self.log.info("Creating pid file: %s" % pid_file)
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f.write(repr(os.getpid())+'\n')
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def remove_pid_file(self):
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"""Remove the pid file.
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This should be called at shutdown by registering a callback with
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:func:`reactor.addSystemEventTrigger`. This needs to return
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``None``.
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"""
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pid_file = os.path.join(self.profile_dir.pid_dir, self.name + u'.pid')
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if os.path.isfile(pid_file):
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try:
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self.log.info("Removing pid file: %s" % pid_file)
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os.remove(pid_file)
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except:
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self.log.warn("Error removing the pid file: %s" % pid_file)
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def get_pid_from_file(self):
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"""Get the pid from the pid file.
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If the pid file doesn't exist a :exc:`PIDFileError` is raised.
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"""
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pid_file = os.path.join(self.profile_dir.pid_dir, self.name + u'.pid')
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if os.path.isfile(pid_file):
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with open(pid_file, 'r') as f:
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s = f.read().strip()
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try:
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pid = int(s)
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except:
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raise PIDFileError("invalid pid file: %s (contents: %r)"%(pid_file, s))
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return pid
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else:
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raise PIDFileError('pid file not found: %s' % pid_file)
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def check_pid(self, pid):
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if os.name == 'nt':
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try:
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import ctypes
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# returns 0 if no such process (of ours) exists
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# positive int otherwise
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p = ctypes.windll.kernel32.OpenProcess(1,0,pid)
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except Exception:
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self.log.warn(
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"Could not determine whether pid %i is running via `OpenProcess`. "
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" Making the likely assumption that it is."%pid
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)
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return True
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return bool(p)
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else:
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try:
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p = Popen(['ps','x'], stdout=PIPE, stderr=PIPE)
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output,_ = p.communicate()
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except OSError:
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self.log.warn(
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"Could not determine whether pid %i is running via `ps x`. "
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" Making the likely assumption that it is."%pid
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)
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return True
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pids = map(int, re.findall(r'^\W*\d+', output, re.MULTILINE))
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return pid in pids
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