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Filename : role_include.py
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#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from os.path import basename

import ansible.constants as C
from ansible.errors import AnsibleParserError
from ansible.playbook.attribute import FieldAttribute
from ansible.playbook.block import Block
from ansible.playbook.task_include import TaskInclude
from ansible.playbook.role import Role
from ansible.playbook.role.include import RoleInclude
from ansible.utils.display import Display

__all__ = ['IncludeRole']

display = Display()


class IncludeRole(TaskInclude):

    """
    A Role include is derived from a regular role to handle the special
    circumstances related to the `- include_role: ...`
    """

    BASE = ('name', 'role')  # directly assigned
    FROM_ARGS = ('tasks_from', 'vars_from', 'defaults_from', 'handlers_from')  # used to populate from dict in role
    OTHER_ARGS = ('apply', 'public', 'allow_duplicates')  # assigned to matching property
    VALID_ARGS = tuple(frozenset(BASE + FROM_ARGS + OTHER_ARGS))  # all valid args

    # =================================================================================
    # ATTRIBUTES

    # private as this is a 'module options' vs a task property
    _allow_duplicates = FieldAttribute(isa='bool', default=True, private=True)
    _public = FieldAttribute(isa='bool', default=False, private=True)

    def __init__(self, block=None, role=None, task_include=None):

        super(IncludeRole, self).__init__(block=block, role=role, task_include=task_include)

        self._from_files = {}
        self._parent_role = role
        self._role_name = None
        self._role_path = None

    def get_name(self):
        ''' return the name of the task '''
        return self.name or "%s : %s" % (self.action, self._role_name)

    def get_block_list(self, play=None, variable_manager=None, loader=None):

        # only need play passed in when dynamic
        if play is None:
            myplay = self._parent._play
        else:
            myplay = play

        ri = RoleInclude.load(self._role_name, play=myplay, variable_manager=variable_manager, loader=loader, collection_list=self.collections)
        ri.vars.update(self.vars)

        # build role
        actual_role = Role.load(ri, myplay, parent_role=self._parent_role, from_files=self._from_files,
                                from_include=True)
        actual_role._metadata.allow_duplicates = self.allow_duplicates

        if self.statically_loaded or self.public:
            myplay.roles.append(actual_role)

        # save this for later use
        self._role_path = actual_role._role_path

        # compile role with parent roles as dependencies to ensure they inherit
        # variables
        if not self._parent_role:
            dep_chain = []
        else:
            dep_chain = list(self._parent_role._parents)
            dep_chain.append(self._parent_role)

        p_block = self.build_parent_block()

        # collections value is not inherited; override with the value we calculated during role setup
        p_block.collections = actual_role.collections

        blocks = actual_role.compile(play=myplay, dep_chain=dep_chain)
        for b in blocks:
            b._parent = p_block
            # HACK: parent inheritance doesn't seem to have a way to handle this intermediate override until squashed/finalized
            b.collections = actual_role.collections

        # updated available handlers in play
        handlers = actual_role.get_handler_blocks(play=myplay)
        for h in handlers:
            h._parent = p_block
        myplay.handlers = myplay.handlers + handlers
        return blocks, handlers

    @staticmethod
    def load(data, block=None, role=None, task_include=None, variable_manager=None, loader=None):

        ir = IncludeRole(block, role, task_include=task_include).load_data(data, variable_manager=variable_manager, loader=loader)

        # Validate options
        my_arg_names = frozenset(ir.args.keys())

        # name is needed, or use role as alias
        ir._role_name = ir.args.get('name', ir.args.get('role'))
        if ir._role_name is None:
            raise AnsibleParserError("'name' is a required field for %s." % ir.action, obj=data)

        if 'public' in ir.args and ir.action not in C._ACTION_INCLUDE_ROLE:
            raise AnsibleParserError('Invalid options for %s: public' % ir.action, obj=data)

        # validate bad args, otherwise we silently ignore
        bad_opts = my_arg_names.difference(IncludeRole.VALID_ARGS)
        if bad_opts:
            raise AnsibleParserError('Invalid options for %s: %s' % (ir.action, ','.join(list(bad_opts))), obj=data)

        # build options for role includes
        for key in my_arg_names.intersection(IncludeRole.FROM_ARGS):
            from_key = key.replace('_from', '')
            ir._from_files[from_key] = basename(ir.args.get(key))

        apply_attrs = ir.args.get('apply', {})
        if apply_attrs and ir.action not in C._ACTION_INCLUDE_ROLE:
            raise AnsibleParserError('Invalid options for %s: apply' % ir.action, obj=data)
        elif not isinstance(apply_attrs, dict):
            raise AnsibleParserError('Expected a dict for apply but got %s instead' % type(apply_attrs), obj=data)

        # manual list as otherwise the options would set other task parameters we don't want.
        for option in my_arg_names.intersection(IncludeRole.OTHER_ARGS):
            setattr(ir, option, ir.args.get(option))

        return ir

    def copy(self, exclude_parent=False, exclude_tasks=False):

        new_me = super(IncludeRole, self).copy(exclude_parent=exclude_parent, exclude_tasks=exclude_tasks)
        new_me.statically_loaded = self.statically_loaded
        new_me._from_files = self._from_files.copy()
        new_me._parent_role = self._parent_role
        new_me._role_name = self._role_name
        new_me._role_path = self._role_path

        return new_me

    def get_include_params(self):
        v = super(IncludeRole, self).get_include_params()
        if self._parent_role:
            v.update(self._parent_role.get_role_params())
            v.setdefault('ansible_parent_role_names', []).insert(0, self._parent_role.get_name())
            v.setdefault('ansible_parent_role_paths', []).insert(0, self._parent_role._role_path)
        return v