mirror of
https://github.com/thegeeklab/ansible-later.git
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143 lines
4.3 KiB
Python
143 lines
4.3 KiB
Python
# (c) 2014, Brian Coca, Josh Drake, et al
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# (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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cache: redis
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short_description: Use Redis DB for cache
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description:
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- This cache uses JSON formatted, per host records saved in Redis.
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version_added: "1.9"
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requirements:
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- redis>=2.4.5 (python lib)
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options:
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_uri:
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description:
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- A colon separated string of connection information for Redis.
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required: True
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env:
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- name: ANSIBLE_CACHE_PLUGIN_CONNECTION
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ini:
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- key: fact_caching_connection
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section: defaults
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_prefix:
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description: User defined prefix to use when creating the DB entries
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env:
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- name: ANSIBLE_CACHE_PLUGIN_PREFIX
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ini:
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- key: fact_caching_prefix
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section: defaults
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_timeout:
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default: 86400
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description: Expiration timeout for the cache plugin data
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env:
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- name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
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ini:
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- key: fact_caching_timeout
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section: defaults
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type: integer
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'''
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import time
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import json
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from ansible import constants as C
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from ansible.errors import AnsibleError
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from ansible.plugins.cache import BaseCacheModule
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try:
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from redis import StrictRedis, VERSION
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except ImportError:
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raise AnsibleError("The 'redis' python module (version 2.4.5 or newer) is required for the redis fact cache, 'pip install redis'")
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class CacheModule(BaseCacheModule):
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"""
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A caching module backed by redis.
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Keys are maintained in a zset with their score being the timestamp
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when they are inserted. This allows for the usage of 'zremrangebyscore'
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to expire keys. This mechanism is used or a pattern matched 'scan' for
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performance.
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"""
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def __init__(self, *args, **kwargs):
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if C.CACHE_PLUGIN_CONNECTION:
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connection = C.CACHE_PLUGIN_CONNECTION.split(':')
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else:
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connection = []
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self._timeout = float(C.CACHE_PLUGIN_TIMEOUT)
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self._prefix = C.CACHE_PLUGIN_PREFIX
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self._cache = {}
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self._db = StrictRedis(*connection)
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self._keys_set = 'ansible_cache_keys'
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def _make_key(self, key):
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return self._prefix + key
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def get(self, key):
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if key not in self._cache:
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value = self._db.get(self._make_key(key))
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# guard against the key not being removed from the zset;
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# this could happen in cases where the timeout value is changed
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# between invocations
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if value is None:
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self.delete(key)
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raise KeyError
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self._cache[key] = json.loads(value)
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return self._cache.get(key)
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def set(self, key, value):
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value2 = json.dumps(value)
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if self._timeout > 0: # a timeout of 0 is handled as meaning 'never expire'
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self._db.setex(self._make_key(key), int(self._timeout), value2)
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else:
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self._db.set(self._make_key(key), value2)
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if VERSION[0] == 2:
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self._db.zadd(self._keys_set, time.time(), key)
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else:
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self._db.zadd(self._keys_set, {key: time.time()})
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self._cache[key] = value
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def _expire_keys(self):
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if self._timeout > 0:
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expiry_age = time.time() - self._timeout
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self._db.zremrangebyscore(self._keys_set, 0, expiry_age)
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def keys(self):
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self._expire_keys()
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return self._db.zrange(self._keys_set, 0, -1)
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def contains(self, key):
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self._expire_keys()
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return (self._db.zrank(self._keys_set, key) is not None)
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def delete(self, key):
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if key in self._cache:
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del self._cache[key]
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self._db.delete(self._make_key(key))
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self._db.zrem(self._keys_set, key)
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def flush(self):
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for key in self.keys():
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self.delete(key)
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def copy(self):
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# TODO: there is probably a better way to do this in redis
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ret = dict()
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for key in self.keys():
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ret[key] = self.get(key)
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return ret
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def __getstate__(self):
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return dict()
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def __setstate__(self, data):
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self.__init__()
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