thirdparty/google_appengine/google/appengine/api/memcache/memcache_stub.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Thu, 12 Feb 2009 12:30:36 +0000
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child 2273 e4cb9c53db3e
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Stub version of the memcache API, keeping all data in process memory."""
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import logging
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import time
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from google.appengine.api import apiproxy_stub
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from google.appengine.api import memcache
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from google.appengine.api.memcache import memcache_service_pb
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MemcacheSetResponse = memcache_service_pb.MemcacheSetResponse
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MemcacheSetRequest = memcache_service_pb.MemcacheSetRequest
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MemcacheIncrementRequest = memcache_service_pb.MemcacheIncrementRequest
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MemcacheDeleteResponse = memcache_service_pb.MemcacheDeleteResponse
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class CacheEntry(object):
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  """An entry in the cache."""
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  def __init__(self, value, expiration, flags, gettime):
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    """Initializer.
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    Args:
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      value: String containing the data for this entry.
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      expiration: Number containing the expiration time or offset in seconds
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        for this entry.
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      flags: Opaque flags used by the memcache implementation.
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      gettime: Used for testing. Function that works like time.time().
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    """
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    assert isinstance(value, basestring)
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    assert len(value) <= memcache.MAX_VALUE_SIZE
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    assert isinstance(expiration, (int, long))
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    self._gettime = gettime
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    self.value = value
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    self.flags = flags
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    self.created_time = self._gettime()
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    self.will_expire = expiration != 0
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    self.locked = False
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    self._SetExpiration(expiration)
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  def _SetExpiration(self, expiration):
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    """Sets the expiration for this entry.
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    Args:
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      expiration: Number containing the expiration time or offset in seconds
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        for this entry. If expiration is above one month, then it's considered
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        an absolute time since the UNIX epoch.
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    """
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    if expiration > (86400 * 30):
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      self.expiration_time = expiration
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    else:
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      self.expiration_time = self._gettime() + expiration
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  def CheckExpired(self):
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    """Returns True if this entry has expired; False otherwise."""
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    return self.will_expire and self._gettime() >= self.expiration_time
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  def ExpireAndLock(self, timeout):
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    """Marks this entry as deleted and locks it for the expiration time.
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    Used to implement memcache's delete timeout behavior.
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    Args:
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      timeout: Parameter originally passed to memcache.delete or
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        memcache.delete_multi to control deletion timeout.
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    """
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    self.will_expire = True
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    self.locked = True
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    self._SetExpiration(timeout)
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  def CheckLocked(self):
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    """Returns True if this entry was deleted but has not yet timed out."""
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    return self.locked and not self.CheckExpired()
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class MemcacheServiceStub(apiproxy_stub.APIProxyStub):
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  """Python only memcache service stub.
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  This stub keeps all data in the local process' memory, not in any
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  external servers.
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  """
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  def __init__(self, gettime=time.time, service_name='memcache'):
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    """Initializer.
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    Args:
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      gettime: time.time()-like function used for testing.
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      service_name: Service name expected for all calls.
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    """
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    super(MemcacheServiceStub, self).__init__(service_name)
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    self._gettime = gettime
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    self._ResetStats()
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    self._the_cache = {}
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  def _ResetStats(self):
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    """Resets statistics information."""
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    self._hits = 0
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    self._misses = 0
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    self._byte_hits = 0
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    self._cache_creation_time = self._gettime()
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  def _GetKey(self, key):
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    """Retrieves a CacheEntry from the cache if it hasn't expired.
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    Does not take deletion timeout into account.
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    Args:
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      key: The key to retrieve from the cache.
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    Returns:
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      The corresponding CacheEntry instance, or None if it was not found or
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      has already expired.
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    """
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    entry = self._the_cache.get(key, None)
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    if entry is None:
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      return None
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    elif entry.CheckExpired():
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      del self._the_cache[key]
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      return None
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    else:
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      return entry
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  def _Dynamic_Get(self, request, response):
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    """Implementation of MemcacheService::Get().
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    Args:
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      request: A MemcacheGetRequest.
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      response: A MemcacheGetResponse.
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    """
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    keys = set(request.key_list())
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    for key in keys:
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      entry = self._GetKey(key)
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      if entry is None or entry.CheckLocked():
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        self._misses += 1
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        continue
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      self._hits += 1
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      self._byte_hits += len(entry.value)
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      item = response.add_item()
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      item.set_key(key)
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      item.set_value(entry.value)
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      item.set_flags(entry.flags)
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  def _Dynamic_Set(self, request, response):
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    """Implementation of MemcacheService::Set().
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    Args:
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      request: A MemcacheSetRequest.
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      response: A MemcacheSetResponse.
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    """
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    for item in request.item_list():
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      key = item.key()
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      set_policy = item.set_policy()
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      old_entry = self._GetKey(key)
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      set_status = MemcacheSetResponse.NOT_STORED
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      if ((set_policy == MemcacheSetRequest.SET) or
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          (set_policy == MemcacheSetRequest.ADD and old_entry is None) or
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          (set_policy == MemcacheSetRequest.REPLACE and old_entry is not None)):
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        if (old_entry is None or
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            set_policy == MemcacheSetRequest.SET
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            or not old_entry.CheckLocked()):
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          self._the_cache[key] = CacheEntry(item.value(),
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                                            item.expiration_time(),
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                                            item.flags(),
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                                            gettime=self._gettime)
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          set_status = MemcacheSetResponse.STORED
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      response.add_set_status(set_status)
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  def _Dynamic_Delete(self, request, response):
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    """Implementation of MemcacheService::Delete().
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    Args:
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      request: A MemcacheDeleteRequest.
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      response: A MemcacheDeleteResponse.
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    """
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    for item in request.item_list():
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      key = item.key()
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      entry = self._GetKey(key)
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      delete_status = MemcacheDeleteResponse.DELETED
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      if entry is None:
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        delete_status = MemcacheDeleteResponse.NOT_FOUND
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      elif item.delete_time() == 0:
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        del self._the_cache[key]
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      else:
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        entry.ExpireAndLock(item.delete_time())
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      response.add_delete_status(delete_status)
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  def _Dynamic_Increment(self, request, response):
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    """Implementation of MemcacheService::Increment().
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    Args:
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      request: A MemcacheIncrementRequest.
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      response: A MemcacheIncrementResponse.
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    """
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    key = request.key()
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    entry = self._GetKey(key)
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    if entry is None:
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      return
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    try:
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      old_value = long(entry.value)
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      if old_value < 0:
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   227
        raise ValueError
109
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   228
    except ValueError, e:
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      logging.error('Increment/decrement failed: Could not interpret '
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   230
                    'value for key = "%s" as an unsigned integer.', key)
109
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      return
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    delta = request.delta()
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    if request.direction() == MemcacheIncrementRequest.DECREMENT:
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      delta = -delta
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    new_value = old_value + delta
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   238
    if not (0 <= new_value < 2**64):
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   239
      new_value = 0
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    entry.value = str(new_value)
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   242
    response.set_new_value(new_value)
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  def _Dynamic_FlushAll(self, request, response):
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   245
    """Implementation of MemcacheService::FlushAll().
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   246
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    Args:
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      request: A MemcacheFlushRequest.
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      response: A MemcacheFlushResponse.
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    """
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   251
    self._the_cache.clear()
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    self._ResetStats()
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  def _Dynamic_Stats(self, request, response):
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    """Implementation of MemcacheService::Stats().
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    Args:
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      request: A MemcacheStatsRequest.
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      response: A MemcacheStatsResponse.
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    """
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    stats = response.mutable_stats()
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    stats.set_hits(self._hits)
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    stats.set_misses(self._misses)
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    stats.set_byte_hits(self._byte_hits)
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    stats.set_items(len(self._the_cache))
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    total_bytes = 0
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    for key, entry in self._the_cache.iteritems():
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      total_bytes += len(entry.value)
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    stats.set_bytes(total_bytes)
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    stats.set_oldest_item_age(self._gettime() - self._cache_creation_time)