318 lines
11 KiB
Python
318 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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r'''
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werkzeug.script
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~~~~~~~~~~~~~~~
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.. admonition:: Deprecated Functionality
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``werkzeug.script`` is deprecated without replacement functionality.
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Python's command line support improved greatly with :mod:`argparse`
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and a bunch of alternative modules.
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Most of the time you have recurring tasks while writing an application
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such as starting up an interactive python interpreter with some prefilled
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imports, starting the development server, initializing the database or
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something similar.
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For that purpose werkzeug provides the `werkzeug.script` module which
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helps you writing such scripts.
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Basic Usage
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-----------
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The following snippet is roughly the same in every werkzeug script::
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from werkzeug import script
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# actions go here
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if __name__ == '__main__':
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script.run()
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Starting this script now does nothing because no actions are defined.
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An action is a function in the same module starting with ``"action_"``
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which takes a number of arguments where every argument has a default. The
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type of the default value specifies the type of the argument.
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Arguments can then be passed by position or using ``--name=value`` from
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the shell.
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Because a runserver and shell command is pretty common there are two
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factory functions that create such commands::
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def make_app():
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from yourapplication import YourApplication
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return YourApplication(...)
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action_runserver = script.make_runserver(make_app, use_reloader=True)
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action_shell = script.make_shell(lambda: {'app': make_app()})
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Using The Scripts
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-----------------
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The script from above can be used like this from the shell now:
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.. sourcecode:: text
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$ ./manage.py --help
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$ ./manage.py runserver localhost 8080 --debugger --no-reloader
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$ ./manage.py runserver -p 4000
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$ ./manage.py shell
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As you can see it's possible to pass parameters as positional arguments
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or as named parameters, pretty much like Python function calls.
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:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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'''
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from __future__ import print_function
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import sys
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import inspect
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import getopt
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from os.path import basename
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from werkzeug._compat import iteritems
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argument_types = {
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bool: 'boolean',
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str: 'string',
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int: 'integer',
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float: 'float'
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}
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converters = {
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'boolean': lambda x: x.lower() in ('1', 'true', 'yes', 'on'),
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'string': str,
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'integer': int,
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'float': float
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}
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def run(namespace=None, action_prefix='action_', args=None):
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"""Run the script. Participating actions are looked up in the caller's
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namespace if no namespace is given, otherwise in the dict provided.
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Only items that start with action_prefix are processed as actions. If
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you want to use all items in the namespace provided as actions set
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action_prefix to an empty string.
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:param namespace: An optional dict where the functions are looked up in.
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By default the local namespace of the caller is used.
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:param action_prefix: The prefix for the functions. Everything else
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is ignored.
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:param args: the arguments for the function. If not specified
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:data:`sys.argv` without the first argument is used.
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"""
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if namespace is None:
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namespace = sys._getframe(1).f_locals
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actions = find_actions(namespace, action_prefix)
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if args is None:
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args = sys.argv[1:]
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if not args or args[0] in ('-h', '--help'):
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return print_usage(actions)
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elif args[0] not in actions:
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fail('Unknown action \'%s\'' % args[0])
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arguments = {}
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types = {}
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key_to_arg = {}
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long_options = []
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formatstring = ''
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func, doc, arg_def = actions[args.pop(0)]
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for idx, (arg, shortcut, default, option_type) in enumerate(arg_def):
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real_arg = arg.replace('-', '_')
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if shortcut:
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formatstring += shortcut
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if not isinstance(default, bool):
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formatstring += ':'
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key_to_arg['-' + shortcut] = real_arg
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long_options.append(isinstance(default, bool) and arg or arg + '=')
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key_to_arg['--' + arg] = real_arg
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key_to_arg[idx] = real_arg
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types[real_arg] = option_type
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arguments[real_arg] = default
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try:
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optlist, posargs = getopt.gnu_getopt(args, formatstring, long_options)
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except getopt.GetoptError as e:
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fail(str(e))
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specified_arguments = set()
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for key, value in enumerate(posargs):
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try:
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arg = key_to_arg[key]
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except IndexError:
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fail('Too many parameters')
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specified_arguments.add(arg)
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try:
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arguments[arg] = converters[types[arg]](value)
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except ValueError:
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fail('Invalid value for argument %s (%s): %s' % (key, arg, value))
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for key, value in optlist:
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arg = key_to_arg[key]
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if arg in specified_arguments:
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fail('Argument \'%s\' is specified twice' % arg)
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if types[arg] == 'boolean':
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if arg.startswith('no_'):
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value = 'no'
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else:
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value = 'yes'
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try:
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arguments[arg] = converters[types[arg]](value)
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except ValueError:
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fail('Invalid value for \'%s\': %s' % (key, value))
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newargs = {}
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for k, v in iteritems(arguments):
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newargs[k.startswith('no_') and k[3:] or k] = v
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arguments = newargs
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return func(**arguments)
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def fail(message, code=-1):
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"""Fail with an error."""
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print('Error: %s' % message, file=sys.stderr)
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sys.exit(code)
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def find_actions(namespace, action_prefix):
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"""Find all the actions in the namespace."""
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actions = {}
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for key, value in iteritems(namespace):
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if key.startswith(action_prefix):
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actions[key[len(action_prefix):]] = analyse_action(value)
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return actions
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def print_usage(actions):
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"""Print the usage information. (Help screen)"""
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actions = sorted(iteritems(actions))
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print('usage: %s <action> [<options>]' % basename(sys.argv[0]))
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print(' %s --help' % basename(sys.argv[0]))
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print()
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print('actions:')
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for name, (func, doc, arguments) in actions:
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print(' %s:' % name)
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for line in doc.splitlines():
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print(' %s' % line)
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if arguments:
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print()
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for arg, shortcut, default, argtype in arguments:
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if isinstance(default, bool):
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print(' %s' % (
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(shortcut and '-%s, ' % shortcut or '') + '--' + arg
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))
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else:
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print(' %-30s%-10s%s' % (
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(shortcut and '-%s, ' % shortcut or '') + '--' + arg,
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argtype, default
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))
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print()
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def analyse_action(func):
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"""Analyse a function."""
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description = inspect.getdoc(func) or 'undocumented action'
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arguments = []
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args, varargs, kwargs, defaults = inspect.getargspec(func)
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if varargs or kwargs:
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raise TypeError('variable length arguments for action not allowed.')
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if len(args) != len(defaults or ()):
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raise TypeError('not all arguments have proper definitions')
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for idx, (arg, definition) in enumerate(zip(args, defaults or ())):
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if arg.startswith('_'):
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raise TypeError('arguments may not start with an underscore')
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if not isinstance(definition, tuple):
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shortcut = None
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default = definition
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else:
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shortcut, default = definition
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argument_type = argument_types[type(default)]
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if isinstance(default, bool) and default is True:
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arg = 'no-' + arg
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arguments.append((arg.replace('_', '-'), shortcut,
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default, argument_type))
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return func, description, arguments
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def make_shell(init_func=None, banner=None, use_ipython=True):
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"""Returns an action callback that spawns a new interactive
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python shell.
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:param init_func: an optional initialization function that is
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called before the shell is started. The return
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value of this function is the initial namespace.
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:param banner: the banner that is displayed before the shell. If
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not specified a generic banner is used instead.
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:param use_ipython: if set to `True` ipython is used if available.
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"""
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if banner is None:
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banner = 'Interactive Werkzeug Shell'
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if init_func is None:
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init_func = dict
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def action(ipython=use_ipython):
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"""Start a new interactive python session."""
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namespace = init_func()
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if ipython:
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try:
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try:
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from IPython.frontend.terminal.embed import InteractiveShellEmbed
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sh = InteractiveShellEmbed(banner1=banner)
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except ImportError:
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from IPython.Shell import IPShellEmbed
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sh = IPShellEmbed(banner=banner)
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except ImportError:
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pass
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else:
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sh(global_ns={}, local_ns=namespace)
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return
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from code import interact
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interact(banner, local=namespace)
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return action
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def make_runserver(app_factory, hostname='localhost', port=5000,
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use_reloader=False, use_debugger=False, use_evalex=True,
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threaded=False, processes=1, static_files=None,
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extra_files=None, ssl_context=None):
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"""Returns an action callback that spawns a new development server.
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.. versionadded:: 0.5
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`static_files` and `extra_files` was added.
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..versionadded:: 0.6.1
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`ssl_context` was added.
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:param app_factory: a function that returns a new WSGI application.
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:param hostname: the default hostname the server should listen on.
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:param port: the default port of the server.
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:param use_reloader: the default setting for the reloader.
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:param use_evalex: the default setting for the evalex flag of the debugger.
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:param threaded: the default threading setting.
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:param processes: the default number of processes to start.
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:param static_files: optional dict of static files.
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:param extra_files: optional list of extra files to track for reloading.
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:param ssl_context: optional SSL context for running server in HTTPS mode.
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"""
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def action(hostname=('h', hostname), port=('p', port),
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reloader=use_reloader, debugger=use_debugger,
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evalex=use_evalex, threaded=threaded, processes=processes):
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"""Start a new development server."""
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from werkzeug.serving import run_simple
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app = app_factory()
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run_simple(hostname, port, app,
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use_reloader=reloader, use_debugger=debugger,
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use_evalex=evalex, extra_files=extra_files,
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reloader_interval=1, threaded=threaded, processes=processes,
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static_files=static_files, ssl_context=ssl_context)
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return action
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