mirror of
https://github.com/thegeeklab/ansible-later.git
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243 lines
7.2 KiB
Python
243 lines
7.2 KiB
Python
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# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.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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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from ansible.errors import AnsibleError
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from itertools import chain
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class Group:
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''' a group of ansible hosts '''
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# __slots__ = [ 'name', 'hosts', 'vars', 'child_groups', 'parent_groups', 'depth', '_hosts_cache' ]
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def __init__(self, name=None):
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self.depth = 0
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self.name = name
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self.hosts = []
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self._hosts = None
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self.vars = {}
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self.child_groups = []
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self.parent_groups = []
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self._hosts_cache = None
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self.priority = 1
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def __repr__(self):
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return self.get_name()
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def __str__(self):
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return self.get_name()
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def __getstate__(self):
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return self.serialize()
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def __setstate__(self, data):
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return self.deserialize(data)
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def serialize(self):
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parent_groups = []
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for parent in self.parent_groups:
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parent_groups.append(parent.serialize())
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self._hosts = None
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result = dict(
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name=self.name,
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vars=self.vars.copy(),
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parent_groups=parent_groups,
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depth=self.depth,
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hosts=self.hosts,
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)
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return result
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def deserialize(self, data):
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self.__init__()
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self.name = data.get('name')
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self.vars = data.get('vars', dict())
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self.depth = data.get('depth', 0)
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self.hosts = data.get('hosts', [])
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self._hosts = None
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parent_groups = data.get('parent_groups', [])
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for parent_data in parent_groups:
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g = Group()
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g.deserialize(parent_data)
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self.parent_groups.append(g)
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def _walk_relationship(self, rel):
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'''
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Given `rel` that is an iterable property of Group,
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consitituting a directed acyclic graph among all groups,
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Returns a set of all groups in full tree
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A B C
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| / | /
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| / | /
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D -> E
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| / vertical connections
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| / are directed upward
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F
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Called on F, returns set of (A, B, C, D, E)
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'''
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seen = set([])
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unprocessed = set(getattr(self, rel))
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while unprocessed:
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seen.update(unprocessed)
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unprocessed = set(chain.from_iterable(
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getattr(g, rel) for g in unprocessed
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))
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unprocessed.difference_update(seen)
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return seen
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def get_ancestors(self):
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return self._walk_relationship('parent_groups')
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def get_descendants(self):
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return self._walk_relationship('child_groups')
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@property
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def host_names(self):
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if self._hosts is None:
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self._hosts = set(self.hosts)
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return self._hosts
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def get_name(self):
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return self.name
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def add_child_group(self, group):
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if self == group:
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raise Exception("can't add group to itself")
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# don't add if it's already there
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if group not in self.child_groups:
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# prepare list of group's new ancestors this edge creates
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start_ancestors = group.get_ancestors()
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new_ancestors = self.get_ancestors()
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if group in new_ancestors:
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raise AnsibleError(
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"Adding group '%s' as child to '%s' creates a recursive "
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"dependency loop." % (group.name, self.name))
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new_ancestors.add(self)
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new_ancestors.difference_update(start_ancestors)
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self.child_groups.append(group)
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# update the depth of the child
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group.depth = max([self.depth + 1, group.depth])
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# update the depth of the grandchildren
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group._check_children_depth()
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# now add self to child's parent_groups list, but only if there
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# isn't already a group with the same name
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if self.name not in [g.name for g in group.parent_groups]:
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group.parent_groups.append(self)
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for h in group.get_hosts():
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h.populate_ancestors(additions=new_ancestors)
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self.clear_hosts_cache()
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def _check_children_depth(self):
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depth = self.depth
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start_depth = self.depth # self.depth could change over loop
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seen = set([])
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unprocessed = set(self.child_groups)
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while unprocessed:
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seen.update(unprocessed)
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depth += 1
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to_process = unprocessed.copy()
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unprocessed = set([])
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for g in to_process:
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if g.depth < depth:
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g.depth = depth
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unprocessed.update(g.child_groups)
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if depth - start_depth > len(seen):
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raise AnsibleError("The group named '%s' has a recursive dependency loop." % self.name)
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def add_host(self, host):
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if host.name not in self.host_names:
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self.hosts.append(host)
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self._hosts.add(host.name)
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host.add_group(self)
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self.clear_hosts_cache()
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def remove_host(self, host):
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if host.name in self.host_names:
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self.hosts.remove(host)
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self._hosts.remove(host.name)
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host.remove_group(self)
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self.clear_hosts_cache()
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def set_variable(self, key, value):
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if key == 'ansible_group_priority':
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self.set_priority(int(value))
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else:
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self.vars[key] = value
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def clear_hosts_cache(self):
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self._hosts_cache = None
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for g in self.get_ancestors():
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g._hosts_cache = None
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def get_hosts(self):
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if self._hosts_cache is None:
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self._hosts_cache = self._get_hosts()
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return self._hosts_cache
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def _get_hosts(self):
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hosts = []
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seen = {}
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for kid in self.get_descendants():
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kid_hosts = kid.hosts
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for kk in kid_hosts:
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if kk not in seen:
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seen[kk] = 1
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if self.name == 'all' and kk.implicit:
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continue
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hosts.append(kk)
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for mine in self.hosts:
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if mine not in seen:
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seen[mine] = 1
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if self.name == 'all' and mine.implicit:
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continue
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hosts.append(mine)
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return hosts
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def get_vars(self):
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return self.vars.copy()
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def set_priority(self, priority):
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try:
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self.priority = int(priority)
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except TypeError:
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# FIXME: warn about invalid priority
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pass
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