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@ -1,4 +1,4 @@
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# (c) 2014, Brian Coca, Josh Drake, et al
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# (c) 2017, ansible by Red Hat
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#
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# This file is part of Ansible
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#
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@ -14,222 +14,9 @@
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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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import os
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import time
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import errno
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from abc import ABCMeta, abstractmethod
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from ansible import constants as C
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from ansible.compat.six import with_metaclass
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from ansible.errors import AnsibleError
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from ansible.module_utils._text import to_bytes
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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class BaseCacheModule(with_metaclass(ABCMeta, object)):
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# Backwards compat only. Just import the global display instead
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_display = display
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@abstractmethod
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def get(self, key):
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pass
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@abstractmethod
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def set(self, key, value):
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pass
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@abstractmethod
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def keys(self):
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pass
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@abstractmethod
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def contains(self, key):
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pass
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@abstractmethod
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def delete(self, key):
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pass
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@abstractmethod
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def flush(self):
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pass
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@abstractmethod
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def copy(self):
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pass
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class BaseFileCacheModule(BaseCacheModule):
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"""
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A caching module backed by file based storage.
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"""
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def __init__(self, *args, **kwargs):
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self.plugin_name = self.__module__.split('.')[-1]
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self._timeout = float(C.CACHE_PLUGIN_TIMEOUT)
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self._cache = {}
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self._cache_dir = None
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if C.CACHE_PLUGIN_CONNECTION:
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# expects a dir path
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self._cache_dir = os.path.expanduser(os.path.expandvars(C.CACHE_PLUGIN_CONNECTION))
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if not self._cache_dir:
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raise AnsibleError("error, '%s' cache plugin requires the 'fact_caching_connection' config option"
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" to be set (to a writeable directory path)" % self.plugin_name)
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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) as e:
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raise AnsibleError("error in '%s' cache plugin while trying to create cache dir %s : %s" % (self.plugin_name, self._cache_dir, to_bytes(e)))
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else:
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for x in (os.R_OK, os.W_OK, os.X_OK):
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if not os.access(self._cache_dir, x):
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raise AnsibleError("error in '%s' cache, configured path (%s) does not have necessary permissions (rwx), disabling plugin" % (
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self.plugin_name, self._cache_dir))
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def get(self, key):
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""" This checks the in memory cache first as the fact was not expired at 'gather time'
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and it would be problematic if the key did expire after some long running tasks and
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user gets 'undefined' error in the same play """
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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) or 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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try:
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value = self._load(cachefile)
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self._cache[key] = value
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return value
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except ValueError as e:
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display.warning("error in '%s' cache plugin while trying to read %s : %s."
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" Most likely a corrupt file, so erasing and failing." % (self.plugin_name, cachefile, to_bytes(e)))
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self.delete(key)
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raise AnsibleError("The cache file %s was corrupt, or did not otherwise contain valid data."
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" It has been removed, so you can re-run your command now." % cachefile)
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except (OSError,IOError) as e:
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display.warning("error in '%s' cache plugin while trying to read %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
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raise KeyError
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except Exception as e:
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raise AnsibleError("Error while decoding the cache file %s: %s" % (cachefile, to_bytes(e)))
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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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self._dump(value, cachefile)
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except (OSError,IOError) as e:
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display.warning("error in '%s' cache plugin while trying to write to %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
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def has_expired(self, key):
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if self._timeout == 0:
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return False
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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) as 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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display.warning("error in '%s' cache plugin while trying to stat %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
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return False
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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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cachefile = "%s/%s" % (self._cache_dir, 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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os.stat(cachefile)
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return True
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except (OSError,IOError) as 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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display.warning("error in '%s' cache plugin while trying to stat %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
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pass
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def delete(self, key):
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try:
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del self._cache[key]
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except KeyError:
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pass
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try:
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os.remove("%s/%s" % (self._cache_dir, key))
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except (OSError, IOError):
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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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@abstractmethod
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def _load(self, filepath):
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"""
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Read data from a filepath and return it as a value
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:arg filepath: The filepath to read from.
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:returns: The value stored in the filepath
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This method reads from the file on disk and takes care of any parsing
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and transformation of the data before returning it. The value
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returned should be what Ansible would expect if it were uncached data.
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.. note:: Filehandles have advantages but calling code doesn't know
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whether this file is text or binary, should be decoded, or accessed via
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a library function. Therefore the API uses a filepath and opens
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the file inside of the method.
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"""
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pass
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@abstractmethod
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def _dump(self, value, filepath):
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"""
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Write data to a filepath
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# moved actual classes to __init__ kept here for backward compat with 3rd parties
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from ansible.plugins.cache import BaseCacheModule, BaseFileCacheModule
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:arg value: The value to store
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:arg filepath: The filepath to store it at
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"""
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pass
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Brian Coca
8 years ago
committed by