143 lines
4.2 KiB
Python
143 lines
4.2 KiB
Python
# (c) 2014, Brian Coca, Josh Drake, et al
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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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import os
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import time
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import errno
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import codecs
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try:
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import simplejson as json
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except ImportError:
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import json
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from ansible import constants as C
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from ansible import utils
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from ansible.cache.base import BaseCacheModule
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class CacheModule(BaseCacheModule):
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"""
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A caching module backed by json files.
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"""
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def __init__(self, *args, **kwargs):
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self._timeout = float(C.CACHE_PLUGIN_TIMEOUT)
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self._cache = {}
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self._cache_dir = os.path.expandvars(os.path.expanduser(C.CACHE_PLUGIN_CONNECTION)) # expects a dir path
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if not self._cache_dir:
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utils.exit("error, fact_caching_connection is not set, cannot use fact cache")
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if not os.path.exists(self._cache_dir):
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try:
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os.makedirs(self._cache_dir)
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except (OSError,IOError), e:
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utils.warning("error while trying to create cache dir %s : %s" % (self._cache_dir, str(e)))
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return None
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def get(self, key):
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if key in self._cache:
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return self._cache.get(key)
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if self.has_expired(key):
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raise KeyError
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cachefile = "%s/%s" % (self._cache_dir, key)
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try:
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f = codecs.open(cachefile, 'r', encoding='utf-8')
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except (OSError,IOError), e:
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utils.warning("error while trying to read %s : %s" % (cachefile, str(e)))
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else:
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value = json.load(f)
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self._cache[key] = value
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return value
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finally:
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f.close()
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def set(self, key, value):
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self._cache[key] = value
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cachefile = "%s/%s" % (self._cache_dir, key)
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try:
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f = codecs.open(cachefile, 'w', encoding='utf-8')
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except (OSError,IOError), e:
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utils.warning("error while trying to write to %s : %s" % (cachefile, str(e)))
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else:
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f.write(utils.jsonify(value))
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finally:
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f.close()
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def has_expired(self, key):
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cachefile = "%s/%s" % (self._cache_dir, key)
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try:
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st = os.stat(cachefile)
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except (OSError,IOError), e:
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if e.errno == errno.ENOENT:
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return False
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else:
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utils.warning("error while trying to stat %s : %s" % (cachefile, str(e)))
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if time.time() - st.st_mtime <= self._timeout:
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return False
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if key in self._cache:
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del self._cache[key]
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return True
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def keys(self):
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keys = []
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for k in os.listdir(self._cache_dir):
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if not (k.startswith('.') or self.has_expired(k)):
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keys.append(k)
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return keys
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def contains(self, key):
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if key in self._cache:
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return True
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if self.has_expired(key):
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return False
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try:
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st = os.stat("%s/%s" % (self._cache_dir, key))
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return True
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except (OSError,IOError), e:
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if e.errno == errno.ENOENT:
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return False
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else:
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utils.warning("error while trying to stat %s : %s" % (cachefile, str(e)))
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def delete(self, key):
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del self._cache[key]
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try:
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os.remove("%s/%s" % (self._cache_dir, key))
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except (OSError,IOError), e:
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pass #TODO: only pass on non existing?
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def flush(self):
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self._cache = {}
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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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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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