put cache base classes in __init__ (#22809)

* put cache base classes in __init__

* added placeholder

lib/ansible/plugins/cache/__init__.py

@@ -17,11 +17,17 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+import os
+import time
+import errno
+from abc import ABCMeta, abstractmethod
 from collections import MutableMapping
 
 from ansible import constants as C
+from ansible.compat.six import with_metaclass
 from ansible.errors import AnsibleError
 from ansible.plugins import cache_loader
+from ansible.module_utils._text import to_bytes
 
 try:
     from __main__ import display
@@ -30,6 +36,207 @@ except ImportError:
     display = Display()
 
 
+
+class BaseCacheModule(with_metaclass(ABCMeta, object)):
+
+    # Backwards compat only.  Just import the global display instead
+    _display = display
+
+    @abstractmethod
+    def get(self, key):
+        pass
+
+    @abstractmethod
+    def set(self, key, value):
+        pass
+
+    @abstractmethod
+    def keys(self):
+        pass
+
+    @abstractmethod
+    def contains(self, key):
+        pass
+
+    @abstractmethod
+    def delete(self, key):
+        pass
+
+    @abstractmethod
+    def flush(self):
+        pass
+
+    @abstractmethod
+    def copy(self):
+        pass
+
+
+class BaseFileCacheModule(BaseCacheModule):
+    """
+    A caching module backed by file based storage.
+    """
+    def __init__(self, *args, **kwargs):
+
+        self.plugin_name = self.__module__.split('.')[-1]
+        self._timeout = float(C.CACHE_PLUGIN_TIMEOUT)
+        self._cache = {}
+        self._cache_dir = None
+
+        if C.CACHE_PLUGIN_CONNECTION:
+            # expects a dir path
+            self._cache_dir = os.path.expanduser(os.path.expandvars(C.CACHE_PLUGIN_CONNECTION))
+
+        if not self._cache_dir:
+            raise AnsibleError("error, '%s' cache plugin requires the 'fact_caching_connection' config option"
+                    " to be set (to a writeable directory path)" % self.plugin_name)
+
+        if not os.path.exists(self._cache_dir):
+            try:
+                os.makedirs(self._cache_dir)
+            except (OSError,IOError) as e:
+                raise AnsibleError("error in '%s' cache plugin while trying to create cache dir %s : %s" % (self.plugin_name, self._cache_dir, to_bytes(e)))
+        else:
+            for x in (os.R_OK, os.W_OK, os.X_OK):
+                if not os.access(self._cache_dir, x):
+                    raise AnsibleError("error in '%s' cache, configured path (%s) does not have necessary permissions (rwx), disabling plugin" % (
+                        self.plugin_name, self._cache_dir))
+
+    def get(self, key):
+        """ This checks the in memory cache first as the fact was not expired at 'gather time'
+        and it would be problematic if the key did expire after some long running tasks and
+        user gets 'undefined' error in the same play """
+
+        if key in self._cache:
+            return self._cache.get(key)
+
+        if self.has_expired(key) or key == "":
+            raise KeyError
+
+        cachefile = "%s/%s" % (self._cache_dir, key)
+        try:
+            try:
+                value = self._load(cachefile)
+                self._cache[key] = value
+                return value
+            except ValueError as e:
+                display.warning("error in '%s' cache plugin while trying to read %s : %s."
+                        " Most likely a corrupt file, so erasing and failing." % (self.plugin_name, cachefile, to_bytes(e)))
+                self.delete(key)
+                raise AnsibleError("The cache file %s was corrupt, or did not otherwise contain valid data."
+                        " It has been removed, so you can re-run your command now." % cachefile)
+        except (OSError,IOError) as e:
+            display.warning("error in '%s' cache plugin while trying to read %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
+            raise KeyError
+        except Exception as e:
+            raise AnsibleError("Error while decoding the cache file %s: %s" % (cachefile, to_bytes(e)))
+
+    def set(self, key, value):
+
+        self._cache[key] = value
+
+        cachefile = "%s/%s" % (self._cache_dir, key)
+        try:
+            self._dump(value, cachefile)
+        except (OSError,IOError) as e:
+            display.warning("error in '%s' cache plugin while trying to write to %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
+
+    def has_expired(self, key):
+
+        if self._timeout == 0:
+            return False
+
+        cachefile = "%s/%s" % (self._cache_dir, key)
+        try:
+            st = os.stat(cachefile)
+        except (OSError,IOError) as e:
+            if e.errno == errno.ENOENT:
+                return False
+            else:
+                display.warning("error in '%s' cache plugin while trying to stat %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
+                return False
+
+        if time.time() - st.st_mtime <= self._timeout:
+            return False
+
+        if key in self._cache:
+            del self._cache[key]
+        return True
+
+    def keys(self):
+        keys = []
+        for k in os.listdir(self._cache_dir):
+            if not (k.startswith('.') or self.has_expired(k)):
+                keys.append(k)
+        return keys
+
+    def contains(self, key):
+        cachefile = "%s/%s" % (self._cache_dir, key)
+
+        if key in self._cache:
+            return True
+
+        if self.has_expired(key):
+            return False
+        try:
+            os.stat(cachefile)
+            return True
+        except (OSError,IOError) as e:
+            if e.errno == errno.ENOENT:
+                return False
+            else:
+                display.warning("error in '%s' cache plugin while trying to stat %s : %s" % (self.plugin_name, cachefile, to_bytes(e)))
+                pass
+
+    def delete(self, key):
+        try:
+            del self._cache[key]
+        except KeyError:
+            pass
+        try:
+            os.remove("%s/%s" % (self._cache_dir, key))
+        except (OSError, IOError):
+            pass #TODO: only pass on non existing?
+
+    def flush(self):
+        self._cache = {}
+        for key in self.keys():
+            self.delete(key)
+
+    def copy(self):
+        ret = dict()
+        for key in self.keys():
+            ret[key] = self.get(key)
+        return ret
+
+    @abstractmethod
+    def _load(self, filepath):
+        """
+        Read data from a filepath and return it as a value
+
+        :arg filepath: The filepath to read from.
+        :returns: The value stored in the filepath
+
+        This method reads from the file on disk and takes care of any parsing
+        and transformation of the data before returning it.  The value
+        returned should be what Ansible would expect if it were uncached data.
+
+        .. note:: Filehandles have advantages but calling code doesn't know
+            whether this file is text or binary, should be decoded, or accessed via
+            a library function.  Therefore the API uses a filepath and opens
+            the file inside of the method.
+        """
+        pass
+
+    @abstractmethod
+    def _dump(self, value, filepath):
+        """
+        Write data to a filepath
+
+        :arg value: The value to store
+        :arg filepath: The filepath to store it at
+        """
+        pass
+
 class FactCache(MutableMapping):
 
     def __init__(self, *args, **kwargs):

lib/ansible/plugins/cache/base.py

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

lib/ansible/plugins/cache/jsonfile.py

@@ -27,7 +27,7 @@ except ImportError:
     import json
 
 from ansible.parsing.utils.jsonify import jsonify
-from ansible.plugins.cache.base import BaseFileCacheModule
+from ansible.plugins.cache import BaseFileCacheModule
 
 class CacheModule(BaseFileCacheModule):
     """

lib/ansible/plugins/cache/memcached.py

@@ -25,7 +25,7 @@ from itertools import chain
 
 from ansible import constants as C
 from ansible.errors import AnsibleError
-from ansible.plugins.cache.base import BaseCacheModule
+from ansible.plugins.cache import BaseCacheModule
 
 try:
     import memcache

lib/ansible/plugins/cache/memory.py

@@ -17,7 +17,7 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-from ansible.plugins.cache.base import BaseCacheModule
+from ansible.plugins.cache import BaseCacheModule
 
 class CacheModule(BaseCacheModule):
 

lib/ansible/plugins/cache/pickle.py

@@ -24,7 +24,7 @@ try:
 except ImportError:
     import pickle
 
-from ansible.plugins.cache.base import BaseFileCacheModule
+from ansible.plugins.cache import BaseFileCacheModule
 
 class CacheModule(BaseFileCacheModule):
     """

lib/ansible/plugins/cache/redis.py

@@ -23,7 +23,7 @@ import json
 
 from ansible import constants as C
 from ansible.errors import AnsibleError
-from ansible.plugins.cache.base import BaseCacheModule
+from ansible.plugins.cache import BaseCacheModule
 
 try:
     from redis import StrictRedis

lib/ansible/plugins/cache/yaml.py

@@ -26,7 +26,7 @@ import yaml
 
 from ansible.parsing.yaml.loader import AnsibleLoader
 from ansible.parsing.yaml.dumper import AnsibleDumper
-from ansible.plugins.cache.base import BaseFileCacheModule
+from ansible.plugins.cache import BaseFileCacheModule
 
 class CacheModule(BaseFileCacheModule):
     """