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890 lines
32 KiB
890 lines
32 KiB
4 years ago
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"""A base class for a configurable application."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from collections import defaultdict, OrderedDict
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from copy import deepcopy
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import functools
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import json
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import logging
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import os
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import pprint
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import re
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import sys
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from traitlets.config.configurable import Configurable, SingletonConfigurable
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from traitlets.config.loader import (
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KVArgParseConfigLoader, PyFileConfigLoader, Config, ArgumentError, ConfigFileNotFound, JSONFileConfigLoader
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)
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from traitlets.traitlets import (
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Bool, Unicode, List, Enum, Dict, Instance, TraitError, observe, observe_compat, default,
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)
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from ..utils.importstring import import_item
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from ..utils import cast_unicode
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from ipython_genutils.text import indent, wrap_paragraphs, dedent
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#-----------------------------------------------------------------------------
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# Descriptions for the various sections
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#-----------------------------------------------------------------------------
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# merge flags&aliases into options
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option_description = """
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The options below are convenience aliases to configurable class-options,
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as listed in the "Equivalent to" description-line of the aliases.
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To see all configurable class-options for some <cmd>, use:
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<cmd> --help-all
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""".strip() # trim newlines of front and back
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keyvalue_description = """
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The command-line option below sets the respective configurable class-parameter:
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--Class.parameter=value
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This line is evaluated in Python, so simple expressions are allowed.
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For instance, to set `C.a=[0,1,2]`, you may type this:
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--C.a='range(3)'
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""".strip() # trim newlines of front and back
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# sys.argv can be missing, for example when python is embedded. See the docs
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# for details: http://docs.python.org/2/c-api/intro.html#embedding-python
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if not hasattr(sys, "argv"):
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sys.argv = [""]
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subcommand_description = """
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Subcommands are launched as `{app} cmd [args]`. For information on using
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subcommand 'cmd', do: `{app} cmd -h`.
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"""
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# get running program name
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#-----------------------------------------------------------------------------
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# Application class
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#-----------------------------------------------------------------------------
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_envvar = os.environ.get('TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR','')
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if _envvar.lower() in {'1','true'}:
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TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR = True
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elif _envvar.lower() in {'0','false',''} :
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TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR = False
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else:
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raise ValueError("Unsupported value for environment variable: 'TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR' is set to '%s' which is none of {'0', '1', 'false', 'true', ''}."% _envvar )
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def catch_config_error(method):
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"""Method decorator for catching invalid config (Trait/ArgumentErrors) during init.
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On a TraitError (generally caused by bad config), this will print the trait's
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message, and exit the app.
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For use on init methods, to prevent invoking excepthook on invalid input.
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"""
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@functools.wraps(method)
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def inner(app, *args, **kwargs):
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try:
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return method(app, *args, **kwargs)
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except (TraitError, ArgumentError) as e:
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app.log.fatal("Bad config encountered during initialization: %s", e)
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app.log.debug("Config at the time: %s", app.config)
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app.exit(1)
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return inner
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class ApplicationError(Exception):
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pass
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class LevelFormatter(logging.Formatter):
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"""Formatter with additional `highlevel` record
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This field is empty if log level is less than highlevel_limit,
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otherwise it is formatted with self.highlevel_format.
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Useful for adding 'WARNING' to warning messages,
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without adding 'INFO' to info, etc.
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"""
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highlevel_limit = logging.WARN
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highlevel_format = " %(levelname)s |"
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def format(self, record):
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if record.levelno >= self.highlevel_limit:
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record.highlevel = self.highlevel_format % record.__dict__
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else:
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record.highlevel = ""
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return super(LevelFormatter, self).format(record)
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class Application(SingletonConfigurable):
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"""A singleton application with full configuration support."""
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# The name of the application, will usually match the name of the command
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# line application
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name = Unicode('application')
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# The description of the application that is printed at the beginning
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# of the help.
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description = Unicode('This is an application.')
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# default section descriptions
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option_description = Unicode(option_description)
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keyvalue_description = Unicode(keyvalue_description)
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subcommand_description = Unicode(subcommand_description)
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python_config_loader_class = PyFileConfigLoader
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json_config_loader_class = JSONFileConfigLoader
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# The usage and example string that goes at the end of the help string.
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examples = Unicode()
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# A sequence of Configurable subclasses whose config=True attributes will
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# be exposed at the command line.
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classes = []
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def _classes_inc_parents(self, classes=None):
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"""Iterate through configurable classes, including configurable parents
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:param classes:
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The list of classes to iterate; if not set, uses :attr:`classes`.
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Children should always be after parents, and each class should only be
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yielded once.
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"""
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if classes is None:
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classes = self.classes
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seen = set()
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for c in classes:
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# We want to sort parents before children, so we reverse the MRO
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for parent in reversed(c.mro()):
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if issubclass(parent, Configurable) and (parent not in seen):
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seen.add(parent)
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yield parent
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# The version string of this application.
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version = Unicode('0.0')
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# the argv used to initialize the application
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argv = List()
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# Whether failing to load config files should prevent startup
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raise_config_file_errors = Bool(TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR)
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# The log level for the application
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log_level = Enum((0,10,20,30,40,50,'DEBUG','INFO','WARN','ERROR','CRITICAL'),
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default_value=logging.WARN,
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help="Set the log level by value or name.").tag(config=True)
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@observe('log_level')
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@observe_compat
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def _log_level_changed(self, change):
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"""Adjust the log level when log_level is set."""
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new = change.new
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if isinstance(new, str):
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new = getattr(logging, new)
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self.log_level = new
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self.log.setLevel(new)
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_log_formatter_cls = LevelFormatter
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log_datefmt = Unicode("%Y-%m-%d %H:%M:%S",
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help="The date format used by logging formatters for %(asctime)s"
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).tag(config=True)
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log_format = Unicode("[%(name)s]%(highlevel)s %(message)s",
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help="The Logging format template",
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).tag(config=True)
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@observe('log_datefmt', 'log_format')
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@observe_compat
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def _log_format_changed(self, change):
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"""Change the log formatter when log_format is set."""
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_log_handler = self.log.handlers[0]
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_log_formatter = self._log_formatter_cls(fmt=self.log_format, datefmt=self.log_datefmt)
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_log_handler.setFormatter(_log_formatter)
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@default('log')
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def _log_default(self):
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"""Start logging for this application.
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The default is to log to stderr using a StreamHandler, if no default
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handler already exists. The log level starts at logging.WARN, but this
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can be adjusted by setting the ``log_level`` attribute.
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"""
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log = logging.getLogger(self.__class__.__name__)
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log.setLevel(self.log_level)
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log.propagate = False
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_log = log # copied from Logger.hasHandlers() (new in Python 3.2)
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while _log:
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if _log.handlers:
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return log
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if not _log.propagate:
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break
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else:
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_log = _log.parent
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if sys.executable and sys.executable.endswith('pythonw.exe'):
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# this should really go to a file, but file-logging is only
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# hooked up in parallel applications
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_log_handler = logging.StreamHandler(open(os.devnull, 'w'))
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else:
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_log_handler = logging.StreamHandler()
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_log_formatter = self._log_formatter_cls(fmt=self.log_format, datefmt=self.log_datefmt)
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_log_handler.setFormatter(_log_formatter)
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log.addHandler(_log_handler)
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return log
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#: the alias map for configurables
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#: Keys might strings or tuples for additional options; single-letter alias accessed like `-v`.
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#: Values might be like "Class.trait" strings of two-tuples: (Class.trait, help-text).
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aliases = {'log-level' : 'Application.log_level'}
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# flags for loading Configurables or store_const style flags
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# flags are loaded from this dict by '--key' flags
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# this must be a dict of two-tuples, the first element being the Config/dict
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# and the second being the help string for the flag
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flags = {
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'debug': ({
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'Application': {
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'log_level': logging.DEBUG,
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},
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}, "Set log-level to debug, for the most verbose logging."),
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'show-config': ({
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'Application': {
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'show_config': True,
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},
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}, "Show the application's configuration (human-readable format)"),
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'show-config-json': ({
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'Application': {
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'show_config_json': True,
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},
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}, "Show the application's configuration (json format)"),
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}
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# subcommands for launching other applications
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# if this is not empty, this will be a parent Application
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# this must be a dict of two-tuples,
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# the first element being the application class/import string
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# and the second being the help string for the subcommand
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subcommands = Dict()
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# parse_command_line will initialize a subapp, if requested
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subapp = Instance('traitlets.config.application.Application', allow_none=True)
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# extra command-line arguments that don't set config values
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extra_args = List(Unicode())
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cli_config = Instance(Config, (), {},
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help="""The subset of our configuration that came from the command-line
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We re-load this configuration after loading config files,
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to ensure that it maintains highest priority.
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"""
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)
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_loaded_config_files = List()
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show_config = Bool(
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help="Instead of starting the Application, dump configuration to stdout"
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).tag(config=True)
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show_config_json = Bool(
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help="Instead of starting the Application, dump configuration to stdout (as JSON)"
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).tag(config=True)
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@observe('show_config_json')
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def _show_config_json_changed(self, change):
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self.show_config = change.new
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@observe('show_config')
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def _show_config_changed(self, change):
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if change.new:
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self._save_start = self.start
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self.start = self.start_show_config
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def __init__(self, **kwargs):
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SingletonConfigurable.__init__(self, **kwargs)
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# Ensure my class is in self.classes, so my attributes appear in command line
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# options and config files.
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cls = self.__class__
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if cls not in self.classes:
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if self.classes is cls.classes:
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# class attr, assign instead of insert
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self.classes = [cls] + self.classes
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else:
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self.classes.insert(0, self.__class__)
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@observe('config')
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@observe_compat
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def _config_changed(self, change):
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super(Application, self)._config_changed(change)
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self.log.debug('Config changed: %r', change.new)
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@catch_config_error
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def initialize(self, argv=None):
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"""Do the basic steps to configure me.
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Override in subclasses.
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"""
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self.parse_command_line(argv)
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def start(self):
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"""Start the app mainloop.
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Override in subclasses.
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"""
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if self.subapp is not None:
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return self.subapp.start()
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def start_show_config(self):
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"""start function used when show_config is True"""
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config = self.config.copy()
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# exclude show_config flags from displayed config
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for cls in self.__class__.mro():
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if cls.__name__ in config:
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cls_config = config[cls.__name__]
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cls_config.pop('show_config', None)
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cls_config.pop('show_config_json', None)
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if self.show_config_json:
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json.dump(config, sys.stdout,
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indent=1, sort_keys=True, default=repr)
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# add trailing newline
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sys.stdout.write('\n')
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return
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if self._loaded_config_files:
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print("Loaded config files:")
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for f in self._loaded_config_files:
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print(' ' + f)
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print()
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for classname in sorted(config):
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class_config = config[classname]
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if not class_config:
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continue
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print(classname)
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pformat_kwargs = dict(indent=4, compact=True)
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for traitname in sorted(class_config):
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value = class_config[traitname]
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print(' .{} = {}'.format(
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traitname,
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pprint.pformat(value, **pformat_kwargs),
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))
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def print_alias_help(self):
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"""Print the alias parts of the help."""
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print('\n'.join(self.emit_alias_help()))
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def emit_alias_help(self):
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"""Yield the lines for alias part of the help."""
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if not self.aliases:
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return
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classdict = {}
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for cls in self.classes:
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# include all parents (up to, but excluding Configurable) in available names
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for c in cls.mro()[:-3]:
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classdict[c.__name__] = c
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for alias, longname in self.aliases.items():
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try:
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if isinstance(longname, tuple):
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longname, fhelp = longname
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else:
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fhelp = None
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classname, traitname = longname.split('.', 1)
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cls = classdict[classname]
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trait = cls.class_traits(config=True)[traitname]
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fhelp = cls.class_get_trait_help(trait, helptext=fhelp).splitlines()
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if not isinstance(alias, tuple):
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alias = (alias, )
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alias = sorted(alias, key=len)
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alias = ', '.join(('--%s' if len(m) > 1 else '-%s') % m
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for m in alias)
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# reformat first line
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fhelp[0] = fhelp[0].replace('--' + longname, alias)
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for l in fhelp:
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yield l
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yield indent("Equivalent to: [--%s]" % longname)
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except Exception as ex:
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self.log.error('Failed collecting help-message for alias %r, due to: %s',
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alias, ex)
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raise
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def print_flag_help(self):
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"""Print the flag part of the help."""
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print('\n'.join(self.emit_flag_help()))
|
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def emit_flag_help(self):
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"""Yield the lines for the flag part of the help."""
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||
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if not self.flags:
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return
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||
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for flags, (cfg, fhelp) in self.flags.items():
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try:
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if not isinstance(flags, tuple):
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flags = (flags, )
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flags = sorted(flags, key=len)
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flags = ', '.join(('--%s' if len(m) > 1 else '-%s') % m
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||
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for m in flags)
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||
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yield flags
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yield indent(dedent(fhelp.strip()))
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||
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cfg_list = ' '.join('--%s.%s=%s' %(clname, prop, val)
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||
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for clname, props_dict
|
||
|
in cfg.items()
|
||
|
for prop, val in props_dict.items())
|
||
|
cfg_txt = "Equivalent to: [%s]" % cfg_list
|
||
|
yield indent(dedent(cfg_txt))
|
||
|
except Exception as ex:
|
||
|
self.log.error('Failed collecting help-message for flag %r, due to: %s',
|
||
|
flags, ex)
|
||
|
raise
|
||
|
|
||
|
def print_options(self):
|
||
|
"""Print the options part of the help."""
|
||
|
print('\n'.join(self.emit_options_help()))
|
||
|
|
||
|
def emit_options_help(self):
|
||
|
"""Yield the lines for the options part of the help."""
|
||
|
if not self.flags and not self.aliases:
|
||
|
return
|
||
|
header = 'Options'
|
||
|
yield header
|
||
|
yield '=' * len(header)
|
||
|
for p in wrap_paragraphs(self.option_description):
|
||
|
yield p
|
||
|
yield ''
|
||
|
|
||
|
for l in self.emit_flag_help():
|
||
|
yield l
|
||
|
for l in self.emit_alias_help():
|
||
|
yield l
|
||
|
yield ''
|
||
|
|
||
|
def print_subcommands(self):
|
||
|
"""Print the subcommand part of the help."""
|
||
|
print('\n'.join(self.emit_subcommands_help()))
|
||
|
|
||
|
def emit_subcommands_help(self):
|
||
|
"""Yield the lines for the subcommand part of the help."""
|
||
|
if not self.subcommands:
|
||
|
return
|
||
|
|
||
|
header = "Subcommands"
|
||
|
yield header
|
||
|
yield '=' * len(header)
|
||
|
for p in wrap_paragraphs(self.subcommand_description.format(
|
||
|
app=self.name)):
|
||
|
yield p
|
||
|
yield ''
|
||
|
for subc, (cls, help) in self.subcommands.items():
|
||
|
yield subc
|
||
|
if help:
|
||
|
yield indent(dedent(help.strip()))
|
||
|
yield ''
|
||
|
|
||
|
def emit_help_epilogue(self, classes):
|
||
|
"""Yield the very bottom lines of the help message.
|
||
|
|
||
|
If classes=False (the default), print `--help-all` msg.
|
||
|
"""
|
||
|
if not classes:
|
||
|
yield "To see all available configurables, use `--help-all`."
|
||
|
yield ''
|
||
|
|
||
|
def print_help(self, classes=False):
|
||
|
"""Print the help for each Configurable class in self.classes.
|
||
|
|
||
|
If classes=False (the default), only flags and aliases are printed.
|
||
|
"""
|
||
|
print('\n'.join(self.emit_help(classes=classes)))
|
||
|
|
||
|
def emit_help(self, classes=False):
|
||
|
"""Yield the help-lines for each Configurable class in self.classes.
|
||
|
|
||
|
If classes=False (the default), only flags and aliases are printed.
|
||
|
"""
|
||
|
for l in self.emit_description():
|
||
|
yield l
|
||
|
for l in self.emit_subcommands_help():
|
||
|
yield l
|
||
|
for l in self.emit_options_help():
|
||
|
yield l
|
||
|
|
||
|
if classes:
|
||
|
help_classes = self._classes_with_config_traits()
|
||
|
if help_classes:
|
||
|
yield "Class options"
|
||
|
yield "============="
|
||
|
for p in wrap_paragraphs(self.keyvalue_description):
|
||
|
yield p
|
||
|
yield ''
|
||
|
|
||
|
for cls in help_classes:
|
||
|
yield cls.class_get_help()
|
||
|
yield ''
|
||
|
for l in self.emit_examples():
|
||
|
yield l
|
||
|
|
||
|
for l in self.emit_help_epilogue(classes):
|
||
|
yield l
|
||
|
|
||
|
def document_config_options(self):
|
||
|
"""Generate rST format documentation for the config options this application
|
||
|
|
||
|
Returns a multiline string.
|
||
|
"""
|
||
|
return '\n'.join(c.class_config_rst_doc()
|
||
|
for c in self._classes_inc_parents())
|
||
|
|
||
|
def print_description(self):
|
||
|
"""Print the application description."""
|
||
|
print('\n'.join(self.emit_description()))
|
||
|
|
||
|
def emit_description(self):
|
||
|
"""Yield lines with the application description."""
|
||
|
for p in wrap_paragraphs(self.description or self.__doc__):
|
||
|
yield p
|
||
|
yield ''
|
||
|
|
||
|
def print_examples(self):
|
||
|
"""Print usage and examples (see `emit_examples()`). """
|
||
|
print('\n'.join(self.emit_examples()))
|
||
|
|
||
|
def emit_examples(self):
|
||
|
"""Yield lines with the usage and examples.
|
||
|
|
||
|
This usage string goes at the end of the command line help string
|
||
|
and should contain examples of the application's usage.
|
||
|
"""
|
||
|
if self.examples:
|
||
|
yield "Examples"
|
||
|
yield "--------"
|
||
|
yield ''
|
||
|
yield indent(dedent(self.examples.strip()))
|
||
|
yield ''
|
||
|
|
||
|
def print_version(self):
|
||
|
"""Print the version string."""
|
||
|
print(self.version)
|
||
|
|
||
|
@catch_config_error
|
||
|
def initialize_subcommand(self, subc, argv=None):
|
||
|
"""Initialize a subcommand with argv."""
|
||
|
subapp, _ = self.subcommands.get(subc)
|
||
|
|
||
|
if isinstance(subapp, str):
|
||
|
subapp = import_item(subapp)
|
||
|
|
||
|
## Cannot issubclass() on a non-type (SOhttp://stackoverflow.com/questions/8692430)
|
||
|
if isinstance(subapp, type) and issubclass(subapp, Application):
|
||
|
# Clear existing instances before...
|
||
|
self.__class__.clear_instance()
|
||
|
# instantiating subapp...
|
||
|
self.subapp = subapp.instance(parent=self)
|
||
|
elif callable(subapp):
|
||
|
# or ask factory to create it...
|
||
|
self.subapp = subapp(self)
|
||
|
else:
|
||
|
raise AssertionError("Invalid mappings for subcommand '%s'!" % subc)
|
||
|
|
||
|
# ... and finally initialize subapp.
|
||
|
self.subapp.initialize(argv)
|
||
|
|
||
|
def flatten_flags(self):
|
||
|
"""Flatten flags and aliases for loaders, so cl-args override as expected.
|
||
|
|
||
|
This prevents issues such as an alias pointing to InteractiveShell,
|
||
|
but a config file setting the same trait in TerminalInteraciveShell
|
||
|
getting inappropriate priority over the command-line arg.
|
||
|
Also, loaders expect ``(key: longname)`` and not ````key: (longname, help)`` items.
|
||
|
|
||
|
Only aliases with exactly one descendent in the class list
|
||
|
will be promoted.
|
||
|
|
||
|
"""
|
||
|
# build a tree of classes in our list that inherit from a particular
|
||
|
# it will be a dict by parent classname of classes in our list
|
||
|
# that are descendents
|
||
|
mro_tree = defaultdict(list)
|
||
|
for cls in self.classes:
|
||
|
clsname = cls.__name__
|
||
|
for parent in cls.mro()[1:-3]:
|
||
|
# exclude cls itself and Configurable,HasTraits,object
|
||
|
mro_tree[parent.__name__].append(clsname)
|
||
|
# flatten aliases, which have the form:
|
||
|
# { 'alias' : 'Class.trait' }
|
||
|
aliases = {}
|
||
|
for alias, longname in self.aliases.items():
|
||
|
if isinstance(longname, tuple):
|
||
|
longname, _ = longname
|
||
|
cls, trait = longname.split('.', 1)
|
||
|
children = mro_tree[cls]
|
||
|
if len(children) == 1:
|
||
|
# exactly one descendent, promote alias
|
||
|
cls = children[0]
|
||
|
if not isinstance(aliases, tuple):
|
||
|
alias = (alias, )
|
||
|
for al in alias:
|
||
|
aliases[al] = '.'.join([cls,trait])
|
||
|
|
||
|
# flatten flags, which are of the form:
|
||
|
# { 'key' : ({'Cls' : {'trait' : value}}, 'help')}
|
||
|
flags = {}
|
||
|
for key, (flagdict, help) in self.flags.items():
|
||
|
newflag = {}
|
||
|
for cls, subdict in flagdict.items():
|
||
|
children = mro_tree[cls]
|
||
|
# exactly one descendent, promote flag section
|
||
|
if len(children) == 1:
|
||
|
cls = children[0]
|
||
|
|
||
|
if cls in newflag:
|
||
|
newflag[cls].update(subdict)
|
||
|
else:
|
||
|
newflag[cls] = subdict
|
||
|
|
||
|
if not isinstance(key, tuple):
|
||
|
key = (key, )
|
||
|
for k in key:
|
||
|
flags[k] = (newflag, help)
|
||
|
return flags, aliases
|
||
|
|
||
|
def _create_loader(self, argv, aliases, flags, classes):
|
||
|
return KVArgParseConfigLoader(argv, aliases, flags, classes=classes,
|
||
|
log=self.log)
|
||
|
|
||
|
@catch_config_error
|
||
|
def parse_command_line(self, argv=None):
|
||
|
"""Parse the command line arguments."""
|
||
|
assert not isinstance(argv, str)
|
||
|
argv = sys.argv[1:] if argv is None else argv
|
||
|
self.argv = [cast_unicode(arg) for arg in argv ]
|
||
|
|
||
|
if argv and argv[0] == 'help':
|
||
|
# turn `ipython help notebook` into `ipython notebook -h`
|
||
|
argv = argv[1:] + ['-h']
|
||
|
|
||
|
if self.subcommands and len(argv) > 0:
|
||
|
# we have subcommands, and one may have been specified
|
||
|
subc, subargv = argv[0], argv[1:]
|
||
|
if re.match(r'^\w(\-?\w)*$', subc) and subc in self.subcommands:
|
||
|
# it's a subcommand, and *not* a flag or class parameter
|
||
|
return self.initialize_subcommand(subc, subargv)
|
||
|
|
||
|
# Arguments after a '--' argument are for the script IPython may be
|
||
|
# about to run, not IPython iteslf. For arguments parsed here (help and
|
||
|
# version), we want to only search the arguments up to the first
|
||
|
# occurrence of '--', which we're calling interpreted_argv.
|
||
|
try:
|
||
|
interpreted_argv = argv[:argv.index('--')]
|
||
|
except ValueError:
|
||
|
interpreted_argv = argv
|
||
|
|
||
|
if any(x in interpreted_argv for x in ('-h', '--help-all', '--help')):
|
||
|
self.print_help('--help-all' in interpreted_argv)
|
||
|
self.exit(0)
|
||
|
|
||
|
if '--version' in interpreted_argv or '-V' in interpreted_argv:
|
||
|
self.print_version()
|
||
|
self.exit(0)
|
||
|
|
||
|
# flatten flags&aliases, so cl-args get appropriate priority:
|
||
|
flags, aliases = self.flatten_flags()
|
||
|
classes = tuple(self._classes_with_config_traits())
|
||
|
loader = self._create_loader(argv, aliases, flags, classes=classes)
|
||
|
try:
|
||
|
self.cli_config = deepcopy(loader.load_config())
|
||
|
except SystemExit:
|
||
|
# traitlets 5: no longer print help output on error
|
||
|
# help output is huge, and comes after the error
|
||
|
raise
|
||
|
self.update_config(self.cli_config)
|
||
|
# store unparsed args in extra_args
|
||
|
self.extra_args = loader.extra_args
|
||
|
|
||
|
@classmethod
|
||
|
def _load_config_files(cls, basefilename, path=None, log=None, raise_config_file_errors=False):
|
||
|
"""Load config files (py,json) by filename and path.
|
||
|
|
||
|
yield each config object in turn.
|
||
|
"""
|
||
|
|
||
|
if not isinstance(path, list):
|
||
|
path = [path]
|
||
|
for path in path[::-1]:
|
||
|
# path list is in descending priority order, so load files backwards:
|
||
|
pyloader = cls.python_config_loader_class(basefilename+'.py', path=path, log=log)
|
||
|
if log:
|
||
|
log.debug("Looking for %s in %s", basefilename, path or os.getcwd())
|
||
|
jsonloader = cls.json_config_loader_class(basefilename+'.json', path=path, log=log)
|
||
|
loaded = []
|
||
|
filenames = []
|
||
|
for loader in [pyloader, jsonloader]:
|
||
|
config = None
|
||
|
try:
|
||
|
config = loader.load_config()
|
||
|
except ConfigFileNotFound:
|
||
|
pass
|
||
|
except Exception:
|
||
|
# try to get the full filename, but it will be empty in the
|
||
|
# unlikely event that the error raised before filefind finished
|
||
|
filename = loader.full_filename or basefilename
|
||
|
# problem while running the file
|
||
|
if raise_config_file_errors:
|
||
|
raise
|
||
|
if log:
|
||
|
log.error("Exception while loading config file %s",
|
||
|
filename, exc_info=True)
|
||
|
else:
|
||
|
if log:
|
||
|
log.debug("Loaded config file: %s", loader.full_filename)
|
||
|
if config:
|
||
|
for filename, earlier_config in zip(filenames, loaded):
|
||
|
collisions = earlier_config.collisions(config)
|
||
|
if collisions and log:
|
||
|
log.warning("Collisions detected in {0} and {1} config files."
|
||
|
" {1} has higher priority: {2}".format(
|
||
|
filename, loader.full_filename, json.dumps(collisions, indent=2),
|
||
|
))
|
||
|
yield (config, loader.full_filename)
|
||
|
loaded.append(config)
|
||
|
filenames.append(loader.full_filename)
|
||
|
|
||
|
@property
|
||
|
def loaded_config_files(self):
|
||
|
"""Currently loaded configuration files"""
|
||
|
return self._loaded_config_files[:]
|
||
|
|
||
|
@catch_config_error
|
||
|
def load_config_file(self, filename, path=None):
|
||
|
"""Load config files by filename and path."""
|
||
|
filename, ext = os.path.splitext(filename)
|
||
|
new_config = Config()
|
||
|
for (config, filename) in self._load_config_files(filename, path=path, log=self.log,
|
||
|
raise_config_file_errors=self.raise_config_file_errors,
|
||
|
):
|
||
|
new_config.merge(config)
|
||
|
if filename not in self._loaded_config_files: # only add to list of loaded files if not previously loaded
|
||
|
self._loaded_config_files.append(filename)
|
||
|
# add self.cli_config to preserve CLI config priority
|
||
|
new_config.merge(self.cli_config)
|
||
|
self.update_config(new_config)
|
||
|
|
||
|
def _classes_with_config_traits(self, classes=None):
|
||
|
"""
|
||
|
Yields only classes with configurable traits, and their subclasses.
|
||
|
|
||
|
:param classes:
|
||
|
The list of classes to iterate; if not set, uses :attr:`classes`.
|
||
|
|
||
|
Thus, produced sample config-file will contain all classes
|
||
|
on which a trait-value may be overridden:
|
||
|
|
||
|
- either on the class owning the trait,
|
||
|
- or on its subclasses, even if those subclasses do not define
|
||
|
any traits themselves.
|
||
|
"""
|
||
|
if classes is None:
|
||
|
classes = self.classes
|
||
|
|
||
|
cls_to_config = OrderedDict( (cls, bool(cls.class_own_traits(config=True)))
|
||
|
for cls
|
||
|
in self._classes_inc_parents(classes))
|
||
|
|
||
|
def is_any_parent_included(cls):
|
||
|
return any(b in cls_to_config and cls_to_config[b] for b in cls.__bases__)
|
||
|
|
||
|
## Mark "empty" classes for inclusion if their parents own-traits,
|
||
|
# and loop until no more classes gets marked.
|
||
|
#
|
||
|
while True:
|
||
|
to_incl_orig = cls_to_config.copy()
|
||
|
cls_to_config = OrderedDict( (cls, inc_yes or is_any_parent_included(cls))
|
||
|
for cls, inc_yes
|
||
|
in cls_to_config.items())
|
||
|
if cls_to_config == to_incl_orig:
|
||
|
break
|
||
|
for cl, inc_yes in cls_to_config.items():
|
||
|
if inc_yes:
|
||
|
yield cl
|
||
|
|
||
|
def generate_config_file(self, classes=None):
|
||
|
"""generate default config file from Configurables"""
|
||
|
lines = ["# Configuration file for %s." % self.name]
|
||
|
lines.append('')
|
||
|
classes = self.classes if classes is None else classes
|
||
|
config_classes = list(self._classes_with_config_traits(classes))
|
||
|
for cls in config_classes:
|
||
|
lines.append(cls.class_config_section(config_classes))
|
||
|
return '\n'.join(lines)
|
||
|
|
||
|
def exit(self, exit_status=0):
|
||
|
self.log.debug("Exiting application: %s" % self.name)
|
||
|
sys.exit(exit_status)
|
||
|
|
||
|
@classmethod
|
||
|
def launch_instance(cls, argv=None, **kwargs):
|
||
|
"""Launch a global instance of this Application
|
||
|
|
||
|
If a global instance already exists, this reinitializes and starts it
|
||
|
"""
|
||
|
app = cls.instance(**kwargs)
|
||
|
app.initialize(argv)
|
||
|
app.start()
|
||
|
|
||
|
#-----------------------------------------------------------------------------
|
||
|
# utility functions, for convenience
|
||
|
#-----------------------------------------------------------------------------
|
||
|
|
||
|
default_aliases = Application.aliases
|
||
|
default_flags = Application.flags
|
||
|
|
||
|
def boolean_flag(name, configurable, set_help='', unset_help=''):
|
||
|
"""Helper for building basic --trait, --no-trait flags.
|
||
|
|
||
|
Parameters
|
||
|
----------
|
||
|
name : str
|
||
|
The name of the flag.
|
||
|
configurable : str
|
||
|
The 'Class.trait' string of the trait to be set/unset with the flag
|
||
|
set_help : unicode
|
||
|
help string for --name flag
|
||
|
unset_help : unicode
|
||
|
help string for --no-name flag
|
||
|
|
||
|
Returns
|
||
|
-------
|
||
|
cfg : dict
|
||
|
A dict with two keys: 'name', and 'no-name', for setting and unsetting
|
||
|
the trait, respectively.
|
||
|
"""
|
||
|
# default helpstrings
|
||
|
set_help = set_help or "set %s=True"%configurable
|
||
|
unset_help = unset_help or "set %s=False"%configurable
|
||
|
|
||
|
cls,trait = configurable.split('.')
|
||
|
|
||
|
setter = {cls : {trait : True}}
|
||
|
unsetter = {cls : {trait : False}}
|
||
|
return {name : (setter, set_help), 'no-'+name : (unsetter, unset_help)}
|
||
|
|
||
|
|
||
|
def get_config():
|
||
|
"""Get the config object for the global Application instance, if there is one
|
||
|
|
||
|
otherwise return an empty config object
|
||
|
"""
|
||
|
if Application.initialized():
|
||
|
return Application.instance().config
|
||
|
else:
|
||
|
return Config()
|
||
|
|
||
|
|
||
|
if __name__ == '__main__':
|
||
|
Application.launch_instance()
|