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Improve Group.get_hosts() performance.

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- reduce hosts group list to unique elements faster
- add a cache of already computed hosts group list
This commit is contained in:
Stoned Elipot 2013-11-18 03:48:55 +01:00
parent b7971a426c
commit b00bf02129
1 changed files with 22 additions and 3 deletions
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25
lib/ansible/inventory/group.py
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@ -18,7 +18,7 @@
class Group(object):
''' a group of ansible hosts '''
__slots__ = [ 'name', 'hosts', 'vars', 'child_groups', 'parent_groups', 'depth' ]
__slots__ = [ 'name', 'hosts', 'vars', 'child_groups', 'parent_groups', 'depth', '_hosts_cache' ]
def __init__(self, name=None):
@ -28,6 +28,7 @@ class Group(object):
self.vars = {}
self.child_groups = []
self.parent_groups = []
self.clear_hosts_cache()
if self.name is None:
raise Exception("group name is required")
@ -41,26 +42,44 @@ class Group(object):
self.child_groups.append(group)
group.depth = max([self.depth+1, group.depth])
group.parent_groups.append(self)
self.clear_hosts_cache()
def add_host(self, host):
self.hosts.append(host)
host.add_group(self)
self.clear_hosts_cache()
def set_variable(self, key, value):
self.vars[key] = value
def clear_hosts_cache(self):
self._hosts_cache = None
for g in self.parent_groups:
g.clear_hosts_cache()
def get_hosts(self):
if self._hosts_cache is None:
self._hosts_cache = self._get_hosts()
return self._hosts_cache
def _get_hosts(self):
hosts = []
seen = {}
for kid in self.child_groups:
kid_hosts = kid.get_hosts()
for kk in kid_hosts:
if kk not in hosts:
if kk not in seen:
seen[kk] = 1
hosts.append(kk)
for mine in self.hosts:
if mine not in hosts:
if mine not in seen:
seen[mine] = 1
hosts.append(mine)
return hosts