author | David Anderson <david.jc.anderson@gmail.com> |
Fri, 13 Mar 2009 02:13:21 +0000 | |
changeset 1825 | a610a2df83d2 |
parent 1278 | a7766286a7be |
child 2273 | e4cb9c53db3e |
permissions | -rwxr-xr-x |
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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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113 |
self._the_cache = {} |
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|
114 |
|
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|
115 |
def _ResetStats(self): |
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116 |
"""Resets statistics information.""" |
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117 |
self._hits = 0 |
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118 |
self._misses = 0 |
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119 |
self._byte_hits = 0 |
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120 |
self._cache_creation_time = self._gettime() |
109
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121 |
|
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122 |
def _GetKey(self, key): |
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123 |
"""Retrieves a CacheEntry from the cache if it hasn't expired. |
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124 |
|
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125 |
Does not take deletion timeout into account. |
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|
126 |
|
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127 |
Args: |
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128 |
key: The key to retrieve from the cache. |
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129 |
|
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130 |
Returns: |
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131 |
The corresponding CacheEntry instance, or None if it was not found or |
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132 |
has already expired. |
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133 |
""" |
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134 |
entry = self._the_cache.get(key, None) |
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135 |
if entry is None: |
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136 |
return None |
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137 |
elif entry.CheckExpired(): |
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138 |
del self._the_cache[key] |
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139 |
return None |
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140 |
else: |
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141 |
return entry |
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142 |
|
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143 |
def _Dynamic_Get(self, request, response): |
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144 |
"""Implementation of MemcacheService::Get(). |
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145 |
|
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146 |
Args: |
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147 |
request: A MemcacheGetRequest. |
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response: A MemcacheGetResponse. |
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149 |
""" |
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150 |
keys = set(request.key_list()) |
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151 |
for key in keys: |
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152 |
entry = self._GetKey(key) |
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153 |
if entry is None or entry.CheckLocked(): |
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154 |
self._misses += 1 |
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155 |
continue |
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156 |
self._hits += 1 |
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157 |
self._byte_hits += len(entry.value) |
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158 |
item = response.add_item() |
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159 |
item.set_key(key) |
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160 |
item.set_value(entry.value) |
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|
161 |
item.set_flags(entry.flags) |
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|
162 |
|
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|
163 |
def _Dynamic_Set(self, request, response): |
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164 |
"""Implementation of MemcacheService::Set(). |
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|
165 |
|
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|
166 |
Args: |
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|
167 |
request: A MemcacheSetRequest. |
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168 |
response: A MemcacheSetResponse. |
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|
169 |
""" |
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170 |
for item in request.item_list(): |
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|
171 |
key = item.key() |
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|
172 |
set_policy = item.set_policy() |
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|
173 |
old_entry = self._GetKey(key) |
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|
174 |
|
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|
175 |
set_status = MemcacheSetResponse.NOT_STORED |
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|
176 |
if ((set_policy == MemcacheSetRequest.SET) or |
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|
177 |
(set_policy == MemcacheSetRequest.ADD and old_entry is None) or |
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|
178 |
(set_policy == MemcacheSetRequest.REPLACE and old_entry is not None)): |
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|
179 |
|
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|
180 |
if (old_entry is None or |
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|
181 |
set_policy == MemcacheSetRequest.SET |
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|
182 |
or not old_entry.CheckLocked()): |
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|
183 |
self._the_cache[key] = CacheEntry(item.value(), |
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|
184 |
item.expiration_time(), |
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|
185 |
item.flags(), |
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|
186 |
gettime=self._gettime) |
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|
187 |
set_status = MemcacheSetResponse.STORED |
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|
188 |
|
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|
189 |
response.add_set_status(set_status) |
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|
190 |
|
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changeset
|
191 |
def _Dynamic_Delete(self, request, response): |
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|
192 |
"""Implementation of MemcacheService::Delete(). |
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changeset
|
193 |
|
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changeset
|
194 |
Args: |
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|
195 |
request: A MemcacheDeleteRequest. |
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|
196 |
response: A MemcacheDeleteResponse. |
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|
197 |
""" |
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changeset
|
198 |
for item in request.item_list(): |
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|
199 |
key = item.key() |
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|
200 |
entry = self._GetKey(key) |
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changeset
|
201 |
|
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changeset
|
202 |
delete_status = MemcacheDeleteResponse.DELETED |
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|
203 |
if entry is None: |
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|
204 |
delete_status = MemcacheDeleteResponse.NOT_FOUND |
149
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109
diff
changeset
|
205 |
elif item.delete_time() == 0: |
109
620f9b141567
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changeset
|
206 |
del self._the_cache[key] |
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changeset
|
207 |
else: |
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|
208 |
entry.ExpireAndLock(item.delete_time()) |
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changeset
|
209 |
|
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|
210 |
response.add_delete_status(delete_status) |
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changeset
|
211 |
|
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diff
changeset
|
212 |
def _Dynamic_Increment(self, request, response): |
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|
213 |
"""Implementation of MemcacheService::Increment(). |
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changeset
|
214 |
|
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changeset
|
215 |
Args: |
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|
216 |
request: A MemcacheIncrementRequest. |
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|
217 |
response: A MemcacheIncrementResponse. |
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|
218 |
""" |
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changeset
|
219 |
key = request.key() |
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|
220 |
entry = self._GetKey(key) |
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|
221 |
if entry is None: |
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|
222 |
return |
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changeset
|
223 |
|
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changeset
|
224 |
try: |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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|
225 |
old_value = long(entry.value) |
1278
a7766286a7be
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
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686
diff
changeset
|
226 |
if old_value < 0: |
a7766286a7be
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
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686
diff
changeset
|
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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'value for key = "%s" as an unsigned integer.', key) |
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return |
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232 |
|
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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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236 |
|
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new_value = old_value + delta |
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if not (0 <= new_value < 2**64): |
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new_value = 0 |
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240 |
|
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entry.value = str(new_value) |
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response.set_new_value(new_value) |
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243 |
|
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def _Dynamic_FlushAll(self, request, response): |
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"""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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self._the_cache.clear() |
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self._ResetStats() |
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253 |
|
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def _Dynamic_Stats(self, request, response): |
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"""Implementation of MemcacheService::Stats(). |
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256 |
|
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257 |
Args: |
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258 |
request: A MemcacheStatsRequest. |
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response: A MemcacheStatsResponse. |
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260 |
""" |
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261 |
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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266 |
|
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267 |
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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270 |
stats.set_bytes(total_bytes) |
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271 |
|
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272 |
stats.set_oldest_item_age(self._gettime() - self._cache_creation_time) |