1136 lines
37 KiB
Python
1136 lines
37 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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r"""
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Configuration options which may be set on the command line or in config files.
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The schema for each option is defined using the Opt sub-classes e.g.
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common_opts = [
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cfg.StrOpt('bind_host',
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default='0.0.0.0',
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help='IP address to listen on'),
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cfg.IntOpt('bind_port',
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default=9292,
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help='Port number to listen on')
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]
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Options can be strings, integers, floats, booleans, lists or 'multi strings':
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enabled_apis_opt = \
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cfg.ListOpt('enabled_apis',
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default=['ec2', 'osapi'],
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help='List of APIs to enable by default')
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DEFAULT_EXTENSIONS = [
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'nova.api.openstack.contrib.standard_extensions'
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]
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osapi_extension_opt = \
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cfg.MultiStrOpt('osapi_extension',
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default=DEFAULT_EXTENSIONS)
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Option schemas are registered with with the config manager at runtime, but
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before the option is referenced:
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class ExtensionManager(object):
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enabled_apis_opt = cfg.ListOpt(...)
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def __init__(self, conf):
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self.conf = conf
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self.conf.register_opt(enabled_apis_opt)
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...
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def _load_extensions(self):
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for ext_factory in self.conf.osapi_extension:
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....
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A common usage pattern is for each option schema to be defined in the module or
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class which uses the option:
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opts = ...
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def add_common_opts(conf):
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conf.register_opts(opts)
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def get_bind_host(conf):
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return conf.bind_host
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def get_bind_port(conf):
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return conf.bind_port
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An option may optionally be made available via the command line. Such options
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must registered with the config manager before the command line is parsed (for
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the purposes of --help and CLI arg validation):
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cli_opts = [
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cfg.BoolOpt('verbose',
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short='v',
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default=False,
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help='Print more verbose output'),
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cfg.BoolOpt('debug',
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short='d',
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default=False,
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help='Print debugging output'),
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]
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def add_common_opts(conf):
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conf.register_cli_opts(cli_opts)
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The config manager has a single CLI option defined by default, --config-file:
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class ConfigOpts(object):
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config_file_opt = \
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MultiStrOpt('config-file',
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...
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def __init__(self, ...):
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...
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self.register_cli_opt(self.config_file_opt)
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Option values are parsed from any supplied config files using SafeConfigParser.
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If none are specified, a default set is used e.g. glance-api.conf and
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glance-common.conf:
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glance-api.conf:
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[DEFAULT]
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bind_port = 9292
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glance-common.conf:
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[DEFAULT]
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bind_host = 0.0.0.0
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Option values in config files override those on the command line. Config files
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are parsed in order, with values in later files overriding those in earlier
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files.
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The parsing of CLI args and config files is initiated by invoking the config
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manager e.g.
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conf = ConfigOpts()
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conf.register_opt(BoolOpt('verbose', ...))
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conf(sys.argv[1:])
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if conf.verbose:
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...
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Options can be registered as belonging to a group:
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rabbit_group = cfg.OptionGroup(name='rabbit',
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title='RabbitMQ options')
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rabbit_host_opt = \
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cfg.StrOpt('host',
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group='rabbit',
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default='localhost',
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help='IP/hostname to listen on'),
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rabbit_port_opt = \
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cfg.IntOpt('port',
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default=5672,
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help='Port number to listen on')
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rabbit_ssl_opt = \
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conf.BoolOpt('use_ssl',
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default=False,
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help='Whether to support SSL connections')
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def register_rabbit_opts(conf):
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conf.register_group(rabbit_group)
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# options can be registered under a group in any of these ways:
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conf.register_opt(rabbit_host_opt)
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conf.register_opt(rabbit_port_opt, group='rabbit')
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conf.register_opt(rabbit_ssl_opt, group=rabbit_group)
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If no group is specified, options belong to the 'DEFAULT' section of config
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files:
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glance-api.conf:
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[DEFAULT]
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bind_port = 9292
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...
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[rabbit]
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host = localhost
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port = 5672
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use_ssl = False
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userid = guest
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password = guest
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virtual_host = /
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Command-line options in a group are automatically prefixed with the group name:
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--rabbit-host localhost --rabbit-use-ssl False
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Option values in the default group are referenced as attributes/properties on
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the config manager; groups are also attributes on the config manager, with
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attributes for each of the options associated with the group:
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server.start(app, conf.bind_port, conf.bind_host, conf)
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self.connection = kombu.connection.BrokerConnection(
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hostname=conf.rabbit.host,
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port=conf.rabbit.port,
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...)
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Option values may reference other values using PEP 292 string substitution:
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opts = [
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cfg.StrOpt('state_path',
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default=os.path.join(os.path.dirname(__file__), '../'),
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help='Top-level directory for maintaining nova state'),
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cfg.StrOpt('sqlite_db',
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default='nova.sqlite',
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help='file name for sqlite'),
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cfg.StrOpt('sql_connection',
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default='sqlite:///$state_path/$sqlite_db',
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help='connection string for sql database'),
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]
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Note that interpolation can be avoided by using '$$'.
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"""
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import sys
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import ConfigParser
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import copy
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import optparse
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import os
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import string
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class Error(Exception):
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"""Base class for cfg exceptions."""
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def __init__(self, msg=None):
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self.msg = msg
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def __str__(self):
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return self.msg
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class ArgsAlreadyParsedError(Error):
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"""Raised if a CLI opt is registered after parsing."""
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def __str__(self):
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ret = "arguments already parsed"
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if self.msg:
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ret += ": " + self.msg
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return ret
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class NoSuchOptError(Error):
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"""Raised if an opt which doesn't exist is referenced."""
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def __init__(self, opt_name, group=None):
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self.opt_name = opt_name
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self.group = group
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def __str__(self):
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if self.group is None:
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return "no such option: %s" % self.opt_name
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else:
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return "no such option in group %s: %s" % (self.group.name,
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self.opt_name)
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class NoSuchGroupError(Error):
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"""Raised if a group which doesn't exist is referenced."""
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def __init__(self, group_name):
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self.group_name = group_name
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def __str__(self):
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return "no such group: %s" % self.group_name
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class DuplicateOptError(Error):
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"""Raised if multiple opts with the same name are registered."""
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def __init__(self, opt_name):
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self.opt_name = opt_name
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def __str__(self):
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return "duplicate option: %s" % self.opt_name
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class TemplateSubstitutionError(Error):
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"""Raised if an error occurs substituting a variable in an opt value."""
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def __str__(self):
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return "template substitution error: %s" % self.msg
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class ConfigFilesNotFoundError(Error):
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"""Raised if one or more config files are not found."""
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def __init__(self, config_files):
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self.config_files = config_files
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def __str__(self):
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return 'Failed to read some config files: %s' % \
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string.join(self.config_files, ',')
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class ConfigFileParseError(Error):
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"""Raised if there is an error parsing a config file."""
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def __init__(self, config_file, msg):
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self.config_file = config_file
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self.msg = msg
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def __str__(self):
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return 'Failed to parse %s: %s' % (self.config_file, self.msg)
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class ConfigFileValueError(Error):
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"""Raised if a config file value does not match its opt type."""
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pass
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def find_config_files(project=None, prog=None, filetype="conf"):
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"""Return a list of default configuration files.
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We default to two config files: [${project}.conf, ${prog}.conf]
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And we look for those config files in the following directories:
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~/.${project}/
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~/
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/etc/${project}/
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/etc/
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We return an absolute path for (at most) one of each the default config
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files, for the topmost directory it exists in.
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For example, if project=foo, prog=bar and /etc/foo/foo.conf, /etc/bar.conf
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and ~/.foo/bar.conf all exist, then we return ['/etc/foo/foo.conf',
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'~/.foo/bar.conf']
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If no project name is supplied, we only look for ${prog.conf}.
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:param project: an optional project name
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:param prog: the program name, defaulting to the basename of sys.argv[0]
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"""
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if prog is None:
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prog = os.path.basename(sys.argv[0])
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fix_path = lambda p: os.path.abspath(os.path.expanduser(p))
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cfg_dirs = [
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fix_path(os.path.join('~', '.' + project)) if project else None,
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fix_path('~'),
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os.path.join('/etc', project) if project else None,
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'/etc',
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'etc',
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]
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cfg_dirs = filter(bool, cfg_dirs)
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def search_dirs(dirs, basename):
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for d in dirs:
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path = os.path.join(d, basename)
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if os.path.exists(path):
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return path
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config_files = []
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if project:
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project_config = search_dirs(cfg_dirs, '%s.%s' % (project, filetype))
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config_files.append(project_config)
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config_files.append(search_dirs(cfg_dirs, '%s.%s' % (prog, filetype)))
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return filter(bool, config_files)
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def _is_opt_registered(opts, opt):
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"""Check whether an opt with the same name is already registered.
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The same opt may be registered multiple times, with only the first
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registration having any effect. However, it is an error to attempt
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to register a different opt with the same name.
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:param opts: the set of opts already registered
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:param opt: the opt to be registered
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:returns: True if the opt was previously registered, False otherwise
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:raises: DuplicateOptError if a naming conflict is detected
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"""
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if opt.dest in opts:
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if opts[opt.dest]['opt'] is not opt:
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raise DuplicateOptError(opt.name)
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return True
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else:
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return False
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class Opt(object):
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"""Base class for all configuration options.
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An Opt object has no public methods, but has a number of public string
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properties:
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name:
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the name of the option, which may include hyphens
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dest:
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the (hyphen-less) ConfigOpts property which contains the option value
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short:
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a single character CLI option name
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default:
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the default value of the option
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metavar:
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the name shown as the argument to a CLI option in --help output
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help:
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an string explaining how the options value is used
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"""
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def __init__(self, name, dest=None, short=None,
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default=None, metavar=None, help=None):
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"""Construct an Opt object.
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The only required parameter is the option's name. However, it is
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common to also supply a default and help string for all options.
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:param name: the option's name
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:param dest: the name of the corresponding ConfigOpts property
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:param short: a single character CLI option name
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:param default: the default value of the option
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:param metavar: the option argument to show in --help
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:param help: an explanation of how the option is used
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"""
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self.name = name
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if dest is None:
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self.dest = self.name.replace('-', '_')
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else:
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self.dest = dest
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self.short = short
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self.default = default
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self.metavar = metavar
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self.help = help
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def _get_from_config_parser(self, cparser, section):
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"""Retrieves the option value from a ConfigParser object.
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This is the method ConfigOpts uses to look up the option value from
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config files. Most opt types override this method in order to perform
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type appropriate conversion of the returned value.
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:param cparser: a ConfigParser object
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:param section: a section name
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"""
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return cparser.get(section, self.dest)
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def _add_to_cli(self, parser, group=None):
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"""Makes the option available in the command line interface.
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This is the method ConfigOpts uses to add the opt to the CLI interface
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as appropriate for the opt type. Some opt types may extend this method,
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others may just extend the helper methods it uses.
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:param parser: the CLI option parser
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:param group: an optional OptGroup object
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"""
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container = self._get_optparse_container(parser, group)
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kwargs = self._get_optparse_kwargs(group)
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prefix = self._get_optparse_prefix('', group)
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self._add_to_optparse(container, self.name, self.short, kwargs, prefix)
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def _add_to_optparse(self, container, name, short, kwargs, prefix=''):
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"""Add an option to an optparse parser or group.
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:param container: an optparse.OptionContainer object
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:param name: the opt name
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:param short: the short opt name
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:param kwargs: the keyword arguments for add_option()
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:param prefix: an optional prefix to prepend to the opt name
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:raises: DuplicateOptError if a naming confict is detected
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"""
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args = ['--' + prefix + name]
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if short:
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args += ['-' + short]
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for a in args:
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if container.has_option(a):
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raise DuplicateOptError(a)
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container.add_option(*args, **kwargs)
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def _get_optparse_container(self, parser, group):
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"""Returns an optparse.OptionContainer.
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:param parser: an optparse.OptionParser
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:param group: an (optional) OptGroup object
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:returns: an optparse.OptionGroup if a group is given, else the parser
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"""
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if group is not None:
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return group._get_optparse_group(parser)
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else:
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return parser
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def _get_optparse_kwargs(self, group, **kwargs):
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"""Build a dict of keyword arguments for optparse's add_option().
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Most opt types extend this method to customize the behaviour of the
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options added to optparse.
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:param group: an optional group
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:param kwargs: optional keyword arguments to add to
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:returns: a dict of keyword arguments
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"""
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dest = self.dest
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if group is not None:
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dest = group.name + '_' + dest
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kwargs.update({
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'dest': dest,
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'metavar': self.metavar,
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'help': self.help,
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})
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return kwargs
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def _get_optparse_prefix(self, prefix, group):
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"""Build a prefix for the CLI option name, if required.
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CLI options in a group are prefixed with the group's name in order
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to avoid conflicts between similarly named options in different
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groups.
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:param prefix: an existing prefix to append to (e.g. 'no' or '')
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:param group: an optional OptGroup object
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:returns: a CLI option prefix including the group name, if appropriate
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"""
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if group is not None:
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return group.name + '-' + prefix
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else:
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return prefix
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class StrOpt(Opt):
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"""
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String opts do not have their values transformed and are returned as
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str objects.
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"""
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pass
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class BoolOpt(Opt):
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"""
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Bool opts are set to True or False on the command line using --optname or
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--noopttname respectively.
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In config files, boolean values are case insensitive and can be set using
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1/0, yes/no, true/false or on/off.
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"""
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def _get_from_config_parser(self, cparser, section):
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"""Retrieve the opt value as a boolean from ConfigParser."""
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return cparser.getboolean(section, self.dest)
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def _add_to_cli(self, parser, group=None):
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"""Extends the base class method to add the --nooptname option."""
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super(BoolOpt, self)._add_to_cli(parser, group)
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self._add_inverse_to_optparse(parser, group)
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def _add_inverse_to_optparse(self, parser, group):
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"""Add the --nooptname option to the option parser."""
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container = self._get_optparse_container(parser, group)
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kwargs = self._get_optparse_kwargs(group, action='store_false')
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prefix = self._get_optparse_prefix('no', group)
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kwargs["help"] = "The inverse of --" + self.name
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self._add_to_optparse(container, self.name, None, kwargs, prefix)
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def _get_optparse_kwargs(self, group, action='store_true', **kwargs):
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"""Extends the base optparse keyword dict for boolean options."""
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return super(BoolOpt,
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self)._get_optparse_kwargs(group, action=action, **kwargs)
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class IntOpt(Opt):
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"""Int opt values are converted to integers using the int() builtin."""
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def _get_from_config_parser(self, cparser, section):
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"""Retrieve the opt value as a integer from ConfigParser."""
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return cparser.getint(section, self.dest)
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|
|
def _get_optparse_kwargs(self, group, **kwargs):
|
|
"""Extends the base optparse keyword dict for integer options."""
|
|
return super(IntOpt,
|
|
self)._get_optparse_kwargs(group, type='int', **kwargs)
|
|
|
|
|
|
class FloatOpt(Opt):
|
|
|
|
"""Float opt values are converted to floats using the float() builtin."""
|
|
|
|
def _get_from_config_parser(self, cparser, section):
|
|
"""Retrieve the opt value as a float from ConfigParser."""
|
|
return cparser.getfloat(section, self.dest)
|
|
|
|
def _get_optparse_kwargs(self, group, **kwargs):
|
|
"""Extends the base optparse keyword dict for float options."""
|
|
return super(FloatOpt,
|
|
self)._get_optparse_kwargs(group, type='float', **kwargs)
|
|
|
|
|
|
class ListOpt(Opt):
|
|
|
|
"""
|
|
List opt values are simple string values separated by commas. The opt value
|
|
is a list containing these strings.
|
|
"""
|
|
|
|
def _get_from_config_parser(self, cparser, section):
|
|
"""Retrieve the opt value as a list from ConfigParser."""
|
|
return cparser.get(section, self.dest).split(',')
|
|
|
|
def _get_optparse_kwargs(self, group, **kwargs):
|
|
"""Extends the base optparse keyword dict for list options."""
|
|
return super(ListOpt,
|
|
self)._get_optparse_kwargs(group,
|
|
type='string',
|
|
action='callback',
|
|
callback=self._parse_list,
|
|
**kwargs)
|
|
|
|
def _parse_list(self, option, opt, value, parser):
|
|
"""An optparse callback for parsing an option value into a list."""
|
|
setattr(parser.values, self.dest, value.split(','))
|
|
|
|
|
|
class MultiStrOpt(Opt):
|
|
|
|
"""
|
|
Multistr opt values are string opts which may be specified multiple times.
|
|
The opt value is a list containing all the string values specified.
|
|
"""
|
|
|
|
def _get_from_config_parser(self, cparser, section):
|
|
"""Retrieve the opt value as a multistr from ConfigParser."""
|
|
# FIXME(markmc): values spread across the CLI and multiple
|
|
# config files should be appended
|
|
value = \
|
|
super(MultiStrOpt, self)._get_from_config_parser(cparser, section)
|
|
return value if value is None else [value]
|
|
|
|
def _get_optparse_kwargs(self, group, **kwargs):
|
|
"""Extends the base optparse keyword dict for multi str options."""
|
|
return super(MultiStrOpt,
|
|
self)._get_optparse_kwargs(group, action='append')
|
|
|
|
|
|
class OptGroup(object):
|
|
|
|
"""
|
|
Represents a group of opts.
|
|
|
|
CLI opts in the group are automatically prefixed with the group name.
|
|
|
|
Each group corresponds to a section in config files.
|
|
|
|
An OptGroup object has no public methods, but has a number of public string
|
|
properties:
|
|
|
|
name:
|
|
the name of the group
|
|
title:
|
|
the group title as displayed in --help
|
|
help:
|
|
the group description as displayed in --help
|
|
"""
|
|
|
|
def __init__(self, name, title=None, help=None):
|
|
"""Constructs an OptGroup object.
|
|
|
|
:param name: the group name
|
|
:param title: the group title for --help
|
|
:param help: the group description for --help
|
|
"""
|
|
self.name = name
|
|
if title is None:
|
|
self.title = "%s options" % title
|
|
else:
|
|
self.title = title
|
|
self.help = help
|
|
|
|
self._opts = {} # dict of dicts of {opt:, override:, default:)
|
|
self._optparse_group = None
|
|
|
|
def _register_opt(self, opt):
|
|
"""Add an opt to this group.
|
|
|
|
:param opt: an Opt object
|
|
:returns: False if previously registered, True otherwise
|
|
:raises: DuplicateOptError if a naming conflict is detected
|
|
"""
|
|
if _is_opt_registered(self._opts, opt):
|
|
return False
|
|
|
|
self._opts[opt.dest] = {'opt': opt, 'override': None, 'default': None}
|
|
|
|
return True
|
|
|
|
def _get_optparse_group(self, parser):
|
|
"""Build an optparse.OptionGroup for this group."""
|
|
if self._optparse_group is None:
|
|
self._optparse_group = \
|
|
optparse.OptionGroup(parser, self.title, self.help)
|
|
return self._optparse_group
|
|
|
|
|
|
class ConfigOpts(object):
|
|
|
|
"""
|
|
Config options which may be set on the command line or in config files.
|
|
|
|
ConfigOpts is a configuration option manager with APIs for registering
|
|
option schemas, grouping options, parsing option values and retrieving
|
|
the values of options.
|
|
"""
|
|
|
|
def __init__(self,
|
|
project=None,
|
|
prog=None,
|
|
version=None,
|
|
usage=None,
|
|
default_config_files=None):
|
|
"""Construct a ConfigOpts object.
|
|
|
|
Automatically registers the --config-file option with either a supplied
|
|
list of default config files, or a list from find_config_files().
|
|
|
|
:param project: the toplevel project name, used to locate config files
|
|
:param prog: the name of the program (defaults to sys.argv[0] basename)
|
|
:param version: the program version (for --version)
|
|
:param usage: a usage string (%prog will be expanded)
|
|
:param default_config_files: config files to use by default
|
|
"""
|
|
if prog is None:
|
|
prog = os.path.basename(sys.argv[0])
|
|
|
|
if default_config_files is None:
|
|
default_config_files = find_config_files(project, prog)
|
|
|
|
self.project = project
|
|
self.prog = prog
|
|
self.version = version
|
|
self.usage = usage
|
|
self.default_config_files = default_config_files
|
|
|
|
self._opts = {} # dict of dicts of (opt:, override:, default:)
|
|
self._groups = {}
|
|
|
|
self._args = None
|
|
self._cli_values = {}
|
|
|
|
self._oparser = optparse.OptionParser(prog=self.prog,
|
|
version=self.version,
|
|
usage=self.usage)
|
|
self._cparser = None
|
|
|
|
self.register_cli_opt(\
|
|
MultiStrOpt('config-file',
|
|
default=self.default_config_files,
|
|
metavar='PATH',
|
|
help='Path to a config file to use. Multiple config '
|
|
'files can be specified, with values in later '
|
|
'files taking precedence. The default files used '
|
|
'are: %s' % (self.default_config_files, )))
|
|
|
|
def __call__(self, args=None):
|
|
"""Parse command line arguments and config files.
|
|
|
|
Calling a ConfigOpts object causes the supplied command line arguments
|
|
and config files to be parsed, causing opt values to be made available
|
|
as attributes of the object.
|
|
|
|
The object may be called multiple times, each time causing the previous
|
|
set of values to be overwritten.
|
|
|
|
:params args: command line arguments (defaults to sys.argv[1:])
|
|
:returns: the list of arguments left over after parsing options
|
|
:raises: SystemExit, ConfigFilesNotFoundError, ConfigFileParseError
|
|
"""
|
|
self.reset()
|
|
|
|
self._args = args
|
|
|
|
(values, args) = self._oparser.parse_args(self._args)
|
|
|
|
self._cli_values = vars(values)
|
|
|
|
if self.config_file:
|
|
self._parse_config_files(self.config_file)
|
|
|
|
return args
|
|
|
|
def __getattr__(self, name):
|
|
"""Look up an option value and perform string substitution.
|
|
|
|
:param name: the opt name (or 'dest', more precisely)
|
|
:returns: the option value (after string subsititution) or a GroupAttr
|
|
:raises: NoSuchOptError,ConfigFileValueError,TemplateSubstitutionError
|
|
"""
|
|
return self._substitute(self._get(name))
|
|
|
|
def reset(self):
|
|
"""Reset the state of the object to before it was called."""
|
|
self._args = None
|
|
self._cli_values = None
|
|
self._cparser = None
|
|
|
|
def register_opt(self, opt, group=None):
|
|
"""Register an option schema.
|
|
|
|
Registering an option schema makes any option value which is previously
|
|
or subsequently parsed from the command line or config files available
|
|
as an attribute of this object.
|
|
|
|
:param opt: an instance of an Opt sub-class
|
|
:param group: an optional OptGroup object or group name
|
|
:return: False if the opt was already register, True otherwise
|
|
:raises: DuplicateOptError
|
|
"""
|
|
if group is not None:
|
|
return self._get_group(group)._register_opt(opt)
|
|
|
|
if _is_opt_registered(self._opts, opt):
|
|
return False
|
|
|
|
self._opts[opt.dest] = {'opt': opt, 'override': None, 'default': None}
|
|
|
|
return True
|
|
|
|
def register_opts(self, opts, group=None):
|
|
"""Register multiple option schemas at once."""
|
|
for opt in opts:
|
|
self.register_opt(opt, group)
|
|
|
|
def register_cli_opt(self, opt, group=None):
|
|
"""Register a CLI option schema.
|
|
|
|
CLI option schemas must be registered before the command line and
|
|
config files are parsed. This is to ensure that all CLI options are
|
|
show in --help and option validation works as expected.
|
|
|
|
:param opt: an instance of an Opt sub-class
|
|
:param group: an optional OptGroup object or group name
|
|
:return: False if the opt was already register, True otherwise
|
|
:raises: DuplicateOptError, ArgsAlreadyParsedError
|
|
"""
|
|
if self._args != None:
|
|
raise ArgsAlreadyParsedError("cannot register CLI option")
|
|
|
|
if not self.register_opt(opt, group):
|
|
return False
|
|
|
|
if group is not None:
|
|
group = self._get_group(group)
|
|
|
|
opt._add_to_cli(self._oparser, group)
|
|
|
|
return True
|
|
|
|
def register_cli_opts(self, opts, group=None):
|
|
"""Register multiple CLI option schemas at once."""
|
|
for opt in opts:
|
|
self.register_cli_opt(opt, group)
|
|
|
|
def register_group(self, group):
|
|
"""Register an option group.
|
|
|
|
An option group must be registered before options can be registered
|
|
with the group.
|
|
|
|
:param group: an OptGroup object
|
|
"""
|
|
if group.name in self._groups:
|
|
return
|
|
|
|
self._groups[group.name] = copy.copy(group)
|
|
|
|
def set_override(self, name, override, group=None):
|
|
"""Override an opt value.
|
|
|
|
Override the command line, config file and default values of a
|
|
given option.
|
|
|
|
:param name: the name/dest of the opt
|
|
:param override: the override value
|
|
:param group: an option OptGroup object or group name
|
|
:raises: NoSuchOptError, NoSuchGroupError
|
|
"""
|
|
opt_info = self._get_opt_info(name, group)
|
|
opt_info['override'] = override
|
|
|
|
def set_default(self, name, default, group=None):
|
|
"""Override an opt's default value.
|
|
|
|
Override the default value of given option. A command line or
|
|
config file value will still take precedence over this default.
|
|
|
|
:param name: the name/dest of the opt
|
|
:param default: the default value
|
|
:param group: an option OptGroup object or group name
|
|
:raises: NoSuchOptError, NoSuchGroupError
|
|
"""
|
|
opt_info = self._get_opt_info(name, group)
|
|
opt_info['default'] = default
|
|
|
|
def log_opt_values(self, logger, lvl):
|
|
"""Log the value of all registered opts.
|
|
|
|
It's often useful for an app to log its configuration to a log file at
|
|
startup for debugging. This method dumps to the entire config state to
|
|
the supplied logger at a given log level.
|
|
|
|
:param logger: a logging.Logger object
|
|
:param lvl: the log level (e.g. logging.DEBUG) arg to logger.log()
|
|
"""
|
|
logger.log(lvl, "*" * 80)
|
|
logger.log(lvl, "Configuration options gathered from:")
|
|
logger.log(lvl, "command line args: %s", self._args)
|
|
logger.log(lvl, "config files: %s", self.config_file)
|
|
logger.log(lvl, "=" * 80)
|
|
|
|
for opt_name in sorted(self._opts):
|
|
logger.log(lvl, "%-30s = %s", opt_name, getattr(self, opt_name))
|
|
|
|
for group_name in self._groups:
|
|
group_attr = self.GroupAttr(self, group_name)
|
|
for opt_name in sorted(self._groups[group_name]._opts):
|
|
logger.log(lvl, "%-30s = %s",
|
|
"%s.%s" % (group_name, opt_name),
|
|
getattr(group_attr, opt_name))
|
|
|
|
logger.log(lvl, "*" * 80)
|
|
|
|
def print_usage(self, file=None):
|
|
"""Print the usage message for the current program."""
|
|
self._oparser.print_usage(file)
|
|
|
|
def _get(self, name, group=None):
|
|
"""Look up an option value.
|
|
|
|
:param name: the opt name (or 'dest', more precisely)
|
|
:param group: an option OptGroup
|
|
:returns: the option value, or a GroupAttr object
|
|
:raises: NoSuchOptError, NoSuchGroupError, ConfigFileValueError,
|
|
TemplateSubstitutionError
|
|
"""
|
|
if group is None and name in self._groups:
|
|
return self.GroupAttr(self, name)
|
|
|
|
if group is not None:
|
|
group = self._get_group(group)
|
|
|
|
info = self._get_opt_info(name, group)
|
|
default, opt, override = map(lambda k: info[k], sorted(info.keys()))
|
|
|
|
if override is not None:
|
|
return override
|
|
|
|
if self._cparser is not None:
|
|
section = group.name if group is not None else 'DEFAULT'
|
|
try:
|
|
return opt._get_from_config_parser(self._cparser, section)
|
|
except (ConfigParser.NoOptionError,
|
|
ConfigParser.NoSectionError):
|
|
pass
|
|
except ValueError, ve:
|
|
raise ConfigFileValueError(str(ve))
|
|
|
|
name = name if group is None else group.name + '_' + name
|
|
value = self._cli_values.get(name, None)
|
|
if value is not None:
|
|
return value
|
|
|
|
if default is not None:
|
|
return default
|
|
|
|
return opt.default
|
|
|
|
def _substitute(self, value):
|
|
"""Perform string template substitution.
|
|
|
|
Substititue any template variables (e.g. $foo, ${bar}) in the supplied
|
|
string value(s) with opt values.
|
|
|
|
:param value: the string value, or list of string values
|
|
:returns: the substituted string(s)
|
|
"""
|
|
if isinstance(value, list):
|
|
return [self._substitute(i) for i in value]
|
|
elif isinstance(value, str):
|
|
tmpl = string.Template(value)
|
|
return tmpl.safe_substitute(self.StrSubWrapper(self))
|
|
else:
|
|
return value
|
|
|
|
def _get_group(self, group_or_name):
|
|
"""Looks up a OptGroup object.
|
|
|
|
Helper function to return an OptGroup given a parameter which can
|
|
either be the group's name or an OptGroup object.
|
|
|
|
The OptGroup object returned is from the internal dict of OptGroup
|
|
objects, which will be a copy of any OptGroup object that users of
|
|
the API have access to.
|
|
|
|
:param group_or_name: the group's name or the OptGroup object itself
|
|
:raises: NoSuchGroupError
|
|
"""
|
|
if isinstance(group_or_name, OptGroup):
|
|
group_name = group_or_name.name
|
|
else:
|
|
group_name = group_or_name
|
|
|
|
if not group_name in self._groups:
|
|
raise NoSuchGroupError(group_name)
|
|
|
|
return self._groups[group_name]
|
|
|
|
def _get_opt_info(self, opt_name, group=None):
|
|
"""Return the (opt, override, default) dict for an opt.
|
|
|
|
:param opt_name: an opt name/dest
|
|
:param group: an optional group name or OptGroup object
|
|
:raises: NoSuchOptError, NoSuchGroupError
|
|
"""
|
|
if group is None:
|
|
opts = self._opts
|
|
else:
|
|
group = self._get_group(group)
|
|
opts = group._opts
|
|
|
|
if not opt_name in opts:
|
|
raise NoSuchOptError(opt_name, group)
|
|
|
|
return opts[opt_name]
|
|
|
|
def _parse_config_files(self, config_files):
|
|
"""Parse the supplied configuration files.
|
|
|
|
:raises: ConfigFilesNotFoundError, ConfigFileParseError
|
|
"""
|
|
self._cparser = ConfigParser.SafeConfigParser()
|
|
|
|
try:
|
|
read_ok = self._cparser.read(config_files)
|
|
except ConfigParser.ParsingError, cpe:
|
|
raise ConfigFileParseError(cpe.filename, cpe.message)
|
|
|
|
if read_ok != config_files:
|
|
not_read_ok = filter(lambda f: f not in read_ok, config_files)
|
|
raise ConfigFilesNotFoundError(not_read_ok)
|
|
|
|
class GroupAttr(object):
|
|
|
|
"""
|
|
A helper class representing the option values of a group as attributes.
|
|
"""
|
|
|
|
def __init__(self, conf, group):
|
|
"""Construct a GroupAttr object.
|
|
|
|
:param conf: a ConfigOpts object
|
|
:param group: a group name or OptGroup object
|
|
"""
|
|
self.conf = conf
|
|
self.group = group
|
|
|
|
def __getattr__(self, name):
|
|
"""Look up an option value and perform template substitution."""
|
|
return self.conf._substitute(self.conf._get(name, self.group))
|
|
|
|
class StrSubWrapper(object):
|
|
|
|
"""
|
|
A helper class exposing opt values as a dict for string substitution.
|
|
"""
|
|
|
|
def __init__(self, conf):
|
|
"""Construct a StrSubWrapper object.
|
|
|
|
:param conf: a ConfigOpts object
|
|
"""
|
|
self.conf = conf
|
|
|
|
def __getitem__(self, key):
|
|
"""Look up an opt value from the ConfigOpts object.
|
|
|
|
:param key: an opt name
|
|
:returns: an opt value
|
|
:raises: TemplateSubstitutionError if attribute is a group
|
|
"""
|
|
value = getattr(self.conf, key)
|
|
if isinstance(value, self.conf.GroupAttr):
|
|
raise TemplateSubstitutionError(
|
|
'substituting group %s not supported' % key)
|
|
return value
|
|
|
|
|
|
class CommonConfigOpts(ConfigOpts):
|
|
|
|
DEFAULT_LOG_FORMAT = ('%(asctime)s %(process)d %(levelname)8s '
|
|
'[%(name)s] %(message)s')
|
|
DEFAULT_LOG_DATE_FORMAT = "%Y-%m-%d %H:%M:%S"
|
|
|
|
common_cli_opts = [
|
|
BoolOpt('debug',
|
|
short='d',
|
|
default=False,
|
|
help='Print debugging output'),
|
|
BoolOpt('verbose',
|
|
short='v',
|
|
default=False,
|
|
help='Print more verbose output'),
|
|
]
|
|
|
|
logging_cli_opts = [
|
|
StrOpt('log-config',
|
|
metavar='PATH',
|
|
help='If this option is specified, the logging configuration '
|
|
'file specified is used and overrides any other logging '
|
|
'options specified. Please see the Python logging module '
|
|
'documentation for details on logging configuration '
|
|
'files.'),
|
|
StrOpt('log-format',
|
|
default=DEFAULT_LOG_FORMAT,
|
|
metavar='FORMAT',
|
|
help='A logging.Formatter log message format string which may '
|
|
'use any of the available logging.LogRecord attributes. '
|
|
'Default: %default'),
|
|
StrOpt('log-date-format',
|
|
default=DEFAULT_LOG_DATE_FORMAT,
|
|
metavar='DATE_FORMAT',
|
|
help='Format string for %(asctime)s in log records. '
|
|
'Default: %default'),
|
|
StrOpt('log-file',
|
|
metavar='PATH',
|
|
help='(Optional) Name of log file to output to. '
|
|
'If not set, logging will go to stdout.'),
|
|
StrOpt('log-dir',
|
|
help='(Optional) The directory to keep log files in '
|
|
'(will be prepended to --logfile)'),
|
|
BoolOpt('use-syslog',
|
|
default=False,
|
|
help='Use syslog for logging.'),
|
|
StrOpt('syslog-log-facility',
|
|
default='LOG_USER',
|
|
help='syslog facility to receive log lines')
|
|
]
|
|
|
|
def __init__(self, **kwargs):
|
|
super(CommonConfigOpts, self).__init__(**kwargs)
|
|
self.register_cli_opts(self.common_cli_opts)
|
|
self.register_cli_opts(self.logging_cli_opts)
|