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#!/usr/bin/env python
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# encoding: utf-8
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"""
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An application for IPython
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Authors:
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* Brian Granger
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* Fernando Perez
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Notes
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-----
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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 sys
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import traceback
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from copy import deepcopy
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from IPython.utils.genutils import get_ipython_dir, filefind
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from IPython.config.loader import (
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PyFileConfigLoader,
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ArgParseConfigLoader,
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Config,
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NoConfigDefault
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)
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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class IPythonArgParseConfigLoader(ArgParseConfigLoader):
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"""Default command line options for IPython based applications."""
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def _add_other_arguments(self):
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self.parser.add_argument('-ipythondir', '--ipythondir',
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dest='Global.ipythondir',type=str,
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help='Set to override default location of Global.ipythondir.',
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default=NoConfigDefault,
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metavar='Global.ipythondir')
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self.parser.add_argument('-p','-profile', '--profile',
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dest='Global.profile',type=str,
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help='The string name of the ipython profile to be used.',
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default=NoConfigDefault,
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metavar='Global.profile')
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self.parser.add_argument('-log_level', '--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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self.parser.add_argument('-config_file', '--config-file',
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dest='Global.config_file',type=str,
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help='Set the config file name to override default.',
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default=NoConfigDefault,
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metavar='Global.config_file')
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class ApplicationError(Exception):
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pass
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class Application(object):
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"""Load a config, construct an app and run it.
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"""
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config_file_name = 'ipython_config.py'
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name = 'ipython'
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def __init__(self):
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self.init_logger()
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self.default_config_file_name = self.config_file_name
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def init_logger(self):
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self.log = logging.getLogger(self.__class__.__name__)
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# This is used as the default until the command line arguments are read.
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self.log.setLevel(logging.WARN)
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self._log_handler = logging.StreamHandler()
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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 _set_log_level(self, level):
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self.log.setLevel(level)
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def _get_log_level(self):
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return self.log.level
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log_level = property(_get_log_level, _set_log_level)
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def start(self):
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"""Start the application."""
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self.attempt(self.create_default_config)
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self.attempt(self.pre_load_command_line_config)
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self.attempt(self.load_command_line_config, action='abort')
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self.attempt(self.post_load_command_line_config)
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self.attempt(self.find_ipythondir)
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self.attempt(self.find_config_file_name)
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self.attempt(self.find_config_file_paths)
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self.attempt(self.pre_load_file_config)
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self.attempt(self.load_file_config)
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self.attempt(self.post_load_file_config)
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self.attempt(self.merge_configs)
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self.attempt(self.pre_construct)
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self.attempt(self.construct)
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self.attempt(self.post_construct)
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self.attempt(self.start_app)
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#-------------------------------------------------------------------------
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# Various stages of Application creation
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#-------------------------------------------------------------------------
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def create_default_config(self):
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"""Create defaults that can't be set elsewhere.
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For the most part, we try to set default in the class attributes
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of Components. But, defaults the top-level Application (which is
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not a HasTraitlets or Component) are not set in this way. Instead
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we set them here. The Global section is for variables like this that
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don't belong to a particular component.
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"""
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self.default_config = Config()
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self.default_config.Global.ipythondir = get_ipython_dir()
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self.log.debug('Default config loaded:')
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self.log.debug(repr(self.default_config))
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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 IPythonArgParseConfigLoader(description=self.name)
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def pre_load_command_line_config(self):
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"""Do actions just before loading the command line config."""
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pass
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def load_command_line_config(self):
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"""Load the command line config.
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This method also sets ``self.debug``.
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"""
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loader = self.create_command_line_config()
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self.command_line_config = loader.load_config()
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self.extra_args = loader.get_extra_args()
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try:
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self.log_level = self.command_line_config.Global.log_level
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except AttributeError:
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pass # Use existing value which is set in Application.init_logger.
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self.log.debug("Command line config loaded:")
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self.log.debug(repr(self.command_line_config))
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def post_load_command_line_config(self):
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"""Do actions just after loading the command line config."""
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pass
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def find_ipythondir(self):
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"""Set the IPython directory.
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This sets ``self.ipythondir``, but the actual value that is passed
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to the application is kept in either ``self.default_config`` or
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``self.command_line_config``. This also added ``self.ipythondir`` to
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``sys.path`` so config files there can be references by other config
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files.
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"""
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try:
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self.ipythondir = self.command_line_config.Global.ipythondir
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except AttributeError:
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self.ipythondir = self.default_config.Global.ipythondir
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sys.path.append(os.path.abspath(self.ipythondir))
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if not os.path.isdir(self.ipythondir):
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os.makedirs(self.ipythondir, mode = 0777)
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self.log.debug("IPYTHONDIR set to: %s" % self.ipythondir)
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def find_config_file_name(self):
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"""Find the config file name for this application.
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If a profile has been set at the command line, this will resolve
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it. The search paths for the config file are set in
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:meth:`find_config_file_paths` and then passed to the config file
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loader where they are resolved to an absolute path.
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"""
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try:
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self.config_file_name = self.command_line_config.Global.config_file
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except AttributeError:
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pass
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try:
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self.profile_name = self.command_line_config.Global.profile
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name_parts = self.config_file_name.split('.')
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name_parts.insert(1, '_' + self.profile_name + '.')
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self.config_file_name = ''.join(name_parts)
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except AttributeError:
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pass
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def find_config_file_paths(self):
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"""Set the search paths for resolving the config file."""
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self.config_file_paths = (os.getcwd(), self.ipythondir)
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def pre_load_file_config(self):
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"""Do actions before the config file is loaded."""
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pass
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def load_file_config(self):
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"""Load the config file.
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This tries to load the config file from disk. If successful, the
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``CONFIG_FILE`` config variable is set to the resolved config file
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location. If not successful, an empty config is used.
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"""
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self.log.debug("Attempting to load config file: <%s>" % self.config_file_name)
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loader = PyFileConfigLoader(self.config_file_name,
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path=self.config_file_paths)
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try:
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self.file_config = loader.load_config()
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self.file_config.Global.config_file = loader.full_filename
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except IOError:
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# Only warn if the default config file was NOT being used.
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if not self.config_file_name==self.default_config_file_name:
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self.log.warn("Config file not found, skipping: <%s>" % \
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self.config_file_name, exc_info=True)
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self.file_config = Config()
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except:
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self.log.warn("Error loading config file: <%s>" % \
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self.config_file_name, exc_info=True)
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self.file_config = Config()
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else:
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self.log.debug("Config file loaded: <%s>" % loader.full_filename)
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self.log.debug(repr(self.file_config))
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# We need to keeep self.log_level updated. But we only use the value
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# of the file_config if a value was not specified at the command
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# line.
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if not hasattr(self.command_line_config.Global, 'log_level'):
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try:
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self.log_level = self.file_config.Global.log_level
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except AttributeError:
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pass # Use existing value
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def post_load_file_config(self):
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"""Do actions after the config file is loaded."""
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pass
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def merge_configs(self):
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"""Merge the default, command line and file config objects."""
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config = Config()
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config._merge(self.default_config)
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config._merge(self.file_config)
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config._merge(self.command_line_config)
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self.master_config = config
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self.log.debug("Master config created:")
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self.log.debug(repr(self.master_config))
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def pre_construct(self):
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"""Do actions after the config has been built, but before construct."""
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pass
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def construct(self):
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"""Construct the main components that make up this app."""
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self.log.debug("Constructing components for application")
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def post_construct(self):
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"""Do actions after construct, but before starting the app."""
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pass
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def start_app(self):
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"""Actually start the app."""
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self.log.debug("Starting application")
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#-------------------------------------------------------------------------
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# Utility methods
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#-------------------------------------------------------------------------
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def abort(self):
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"""Abort the starting of the application."""
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self.log.critical("Aborting application: %s" % self.name, exc_info=True)
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sys.exit(1)
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def exit(self):
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self.log.critical("Aborting application: %s" % self.name)
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sys.exit(1)
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def attempt(self, func, action='abort'):
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try:
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func()
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except SystemExit:
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self.exit()
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except:
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if action == 'abort':
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self.abort()
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elif action == 'exit':
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self.exit()
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