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289 lines
10 KiB
Python
289 lines
10 KiB
Python
# (c) 2014 Michael DeHaan, <michael@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from six import iteritems, string_types
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from ansible.errors import AnsibleParserError
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from ansible.plugins import module_loader
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from ansible.parsing.splitter import parse_kv
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class ModuleArgsParser:
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"""
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There are several ways a module and argument set can be expressed:
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# legacy form (for a shell command)
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- action: shell echo hi
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# common shorthand for local actions vs delegate_to
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- local_action: shell echo hi
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# most commonly:
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- copy: src=a dest=b
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# legacy form
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- action: copy src=a dest=b
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# complex args form, for passing structured data
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- copy:
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src: a
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dest: b
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# gross, but technically legal
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- action:
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module: copy
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args:
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src: a
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dest: b
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# extra gross, but also legal. in this case, the args specified
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# will act as 'defaults' and will be overridden by any args specified
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# in one of the other formats (complex args under the action, or
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# parsed from the k=v string
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- command: 'pwd'
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args:
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chdir: '/tmp'
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This class has some of the logic to canonicalize these into the form
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- module: <module_name>
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delegate_to: <optional>
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args: <args>
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Args may also be munged for certain shell command parameters.
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"""
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def __init__(self, task_ds=dict()):
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assert isinstance(task_ds, dict)
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self._task_ds = task_ds
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def _split_module_string(self, str):
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'''
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when module names are expressed like:
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action: copy src=a dest=b
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the first part of the string is the name of the module
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and the rest are strings pertaining to the arguments.
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'''
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tokens = str.split()
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if len(tokens) > 1:
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return (tokens[0], " ".join(tokens[1:]))
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else:
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return (tokens[0], "")
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def _handle_shell_weirdness(self, action, args):
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'''
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given an action name and an args dictionary, return the
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proper action name and args dictionary. This mostly is due
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to shell/command being treated special and nothing else
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'''
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# don't handle non shell/command modules in this function
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# TODO: in terms of the whole app, should 'raw' also fit here?
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if action not in ['shell', 'command']:
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return (action, args)
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# the shell module really is the command module with an additional
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# parameter
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if action == 'shell':
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action = 'command'
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args['_uses_shell'] = True
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return (action, args)
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def _normalize_parameters(self, thing, action=None, additional_args=dict()):
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'''
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arguments can be fuzzy. Deal with all the forms.
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'''
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# final args are the ones we'll eventually return, so first update
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# them with any additional args specified, which have lower priority
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# than those which may be parsed/normalized next
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final_args = dict()
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if additional_args:
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final_args.update(additional_args)
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# how we normalize depends if we figured out what the module name is
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# yet. If we have already figured it out, it's an 'old style' invocation.
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# otherwise, it's not
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if action is not None:
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args = self._normalize_old_style_args(thing, action)
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else:
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(action, args) = self._normalize_new_style_args(thing)
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# this can occasionally happen, simplify
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if args and 'args' in args:
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tmp_args = args['args']
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del args['args']
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if isinstance(tmp_args, string_types):
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tmp_args = parse_kv(tmp_args)
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args.update(tmp_args)
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# finally, update the args we're going to return with the ones
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# which were normalized above
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if args:
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final_args.update(args)
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return (action, final_args)
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def _normalize_old_style_args(self, thing, action):
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'''
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deals with fuzziness in old-style (action/local_action) module invocations
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returns tuple of (module_name, dictionary_args)
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possible example inputs:
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{ 'local_action' : 'shell echo hi' }
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{ 'action' : 'shell echo hi' }
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{ 'local_action' : { 'module' : 'ec2', 'x' : 1, 'y': 2 }}
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standardized outputs like:
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( 'command', { _raw_params: 'echo hi', _uses_shell: True }
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'''
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if isinstance(thing, dict):
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# form is like: local_action: { module: 'xyz', x: 2, y: 3 } ... uncommon!
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args = thing
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elif isinstance(thing, string_types):
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# form is like: local_action: copy src=a dest=b ... pretty common
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check_raw = action in ('command', 'shell', 'script')
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args = parse_kv(thing, check_raw=check_raw)
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elif thing is None:
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# this can happen with modules which take no params, like ping:
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args = None
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else:
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raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds)
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return args
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def _normalize_new_style_args(self, thing):
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'''
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deals with fuzziness in new style module invocations
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accepting key=value pairs and dictionaries, and always returning dictionaries
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returns tuple of (module_name, dictionary_args)
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possible example inputs:
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{ 'shell' : 'echo hi' }
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{ 'ec2' : { 'region' : 'xyz' }
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{ 'ec2' : 'region=xyz' }
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standardized outputs like:
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('ec2', { region: 'xyz'} )
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'''
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action = None
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args = None
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if isinstance(thing, dict):
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# form is like: copy: { src: 'a', dest: 'b' } ... common for structured (aka "complex") args
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thing = thing.copy()
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if 'module' in thing:
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action = thing['module']
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args = thing.copy()
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del args['module']
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elif isinstance(thing, string_types):
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# form is like: copy: src=a dest=b ... common shorthand throughout ansible
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(action, args) = self._split_module_string(thing)
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check_raw = action in ('command', 'shell', 'script')
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args = parse_kv(args, check_raw=check_raw)
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else:
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# need a dict or a string, so giving up
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raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds)
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return (action, args)
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def parse(self):
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'''
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Given a task in one of the supported forms, parses and returns
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returns the action, arguments, and delegate_to values for the
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task, dealing with all sorts of levels of fuzziness.
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'''
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thing = None
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action = None
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delegate_to = self._task_ds.get('delegate_to', None)
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args = dict()
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#
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# We can have one of action, local_action, or module specified
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#
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# this is the 'extra gross' scenario detailed above, so we grab
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# the args and pass them in as additional arguments, which can/will
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# be overwritten via dict updates from the other arg sources below
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# FIXME: add test cases for this
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additional_args = self._task_ds.get('args', dict())
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# action
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if 'action' in self._task_ds:
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# an old school 'action' statement
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thing = self._task_ds['action']
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action, args = self._normalize_parameters(thing, additional_args=additional_args)
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# local_action
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if 'local_action' in self._task_ds:
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# local_action is similar but also implies a delegate_to
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if action is not None:
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raise AnsibleParserError("action and local_action are mutually exclusive", obj=self._task_ds)
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thing = self._task_ds.get('local_action', '')
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delegate_to = 'localhost'
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action, args = self._normalize_parameters(thing, additional_args=additional_args)
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# module: <stuff> is the more new-style invocation
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# walk the input dictionary to see we recognize a module name
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for (item, value) in iteritems(self._task_ds):
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if item in module_loader or item == 'meta' or item == 'include':
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# finding more than one module name is a problem
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if action is not None:
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raise AnsibleParserError("conflicting action statements", obj=self._task_ds)
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action = item
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thing = value
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action, args = self._normalize_parameters(value, action=action, additional_args=additional_args)
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# FIXME: this should probably be somewhere else
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RAW_PARAM_MODULES = (
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'command',
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'shell',
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'script',
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'include',
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'include_vars',
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'add_host',
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'group_by',
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'set_fact',
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'meta',
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)
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# if we didn't see any module in the task at all, it's not a task really
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if action is None:
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raise AnsibleParserError("no action detected in task", obj=self._task_ds)
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elif args.get('_raw_params', '') != '' and action not in RAW_PARAM_MODULES:
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raise AnsibleParserError("this task '%s' has extra params, which is only allowed in the following modules: %s" % (action, ", ".join(RAW_PARAM_MODULES)), obj=self._task_ds)
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# shell modules require special handling
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(action, args) = self._handle_shell_weirdness(action, args)
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return (action, args, delegate_to)
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