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[awesomized/libmemcached] / libmemcached / delete.cc
1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2 *
3 * Libmemcached library
4 *
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2009 Brian Aker All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * * Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following disclaimer
17 * in the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * * The names of its contributors may not be used to endorse or
21 * promote products derived from this software without specific prior
22 * written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 */
37
38 #include <libmemcached/common.h>
39 #include <libmemcached/memcached/protocol_binary.h>
40
41 memcached_return_t memcached_delete(memcached_st *memc, const char *key, size_t key_length,
42 time_t expiration)
43 {
44 return memcached_delete_by_key(memc, key, key_length, key, key_length, expiration);
45 }
46
47 static inline memcached_return_t ascii_delete(memcached_server_write_instance_st instance,
48 uint32_t ,
49 const char *key,
50 const size_t key_length,
51 const bool reply,
52 const bool is_buffering)
53 {
54 libmemcached_io_vector_st vector[]=
55 {
56 { NULL, 0 },
57 { memcached_literal_param("delete ") },
58 { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
59 { key, key_length },
60 { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
61 { memcached_literal_param("\r\n") }
62 };
63
64 /* Send command header, only flush if we are NOT buffering */
65 return memcached_vdo(instance, vector, 6, is_buffering ? false : true);
66 }
67
68 static inline memcached_return_t binary_delete(memcached_server_write_instance_st instance,
69 uint32_t server_key,
70 const char *key,
71 const size_t key_length,
72 const bool reply,
73 const bool is_buffering)
74 {
75 protocol_binary_request_delete request= {};
76
77 bool should_flush= is_buffering ? false : true;
78
79 request.message.header.request.magic= PROTOCOL_BINARY_REQ;
80 if (reply)
81 {
82 request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
83 }
84 else
85 {
86 request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
87 }
88 request.message.header.request.keylen= htons(uint16_t(key_length + memcached_array_size(instance->root->_namespace)));
89 request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
90 request.message.header.request.bodylen= htonl(uint32_t(key_length + memcached_array_size(instance->root->_namespace)));
91
92 libmemcached_io_vector_st vector[]=
93 {
94 { NULL, 0 },
95 { request.bytes, sizeof(request.bytes) },
96 { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
97 { key, key_length }
98 };
99
100 memcached_return_t rc;
101 if (memcached_fatal(rc= memcached_vdo(instance, vector, 4, should_flush)))
102 {
103 memcached_io_reset(instance);
104 }
105
106 if (memcached_has_replicas(instance))
107 {
108 request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
109
110 for (uint32_t x= 0; x < memcached_has_replicas(instance); ++x)
111 {
112 ++server_key;
113
114 if (server_key == memcached_server_count(instance->root))
115 {
116 server_key= 0;
117 }
118
119 memcached_server_write_instance_st replica= memcached_server_instance_fetch(instance->root, server_key);
120
121 if (memcached_fatal(memcached_vdo(replica, vector, 4, should_flush)))
122 {
123 memcached_io_reset(replica);
124 }
125 else
126 {
127 memcached_server_response_decrement(replica);
128 }
129 }
130 }
131
132 return rc;
133 }
134
135 memcached_return_t memcached_delete_by_key(memcached_st *memc,
136 const char *group_key, size_t group_key_length,
137 const char *key, size_t key_length,
138 time_t expiration)
139 {
140 LIBMEMCACHED_MEMCACHED_DELETE_START();
141
142 memcached_return_t rc;
143 if (memcached_fatal(rc= initialize_query(memc, true)))
144 {
145 return rc;
146 }
147
148 if (memcached_fatal(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
149 {
150 return memcached_last_error(memc);
151 }
152
153 if (expiration)
154 {
155 return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
156 memcached_literal_param("Memcached server version does not allow expiration of deleted items"));
157 }
158
159 uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
160 memcached_server_write_instance_st instance= memcached_server_instance_fetch(memc, server_key);
161
162 bool is_buffering= memcached_is_buffering(instance->root);
163 bool is_replying= memcached_is_replying(instance->root);
164
165 // If a delete trigger exists, we need a response, so no buffering/noreply
166 if (memc->delete_trigger)
167 {
168 if (is_buffering)
169 {
170 return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
171 memcached_literal_param("Delete triggers cannot be used if buffering is enabled"));
172 }
173
174 if (is_replying == false)
175 {
176 return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
177 memcached_literal_param("Delete triggers cannot be used if MEMCACHED_BEHAVIOR_NOREPLY is set"));
178 }
179 }
180
181 if (memcached_is_binary(memc))
182 {
183 rc= binary_delete(instance, server_key, key, key_length, is_replying, is_buffering);
184 }
185 else
186 {
187 rc= ascii_delete(instance, server_key, key, key_length, is_replying, is_buffering);
188 }
189
190 if (rc == MEMCACHED_SUCCESS)
191 {
192 if (is_buffering == true)
193 {
194 rc= MEMCACHED_BUFFERED;
195 }
196 else if (is_replying == false)
197 {
198 rc= MEMCACHED_SUCCESS;
199 }
200 else
201 {
202 char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
203 rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
204 if (rc == MEMCACHED_DELETED)
205 {
206 rc= MEMCACHED_SUCCESS;
207 if (memc->delete_trigger)
208 {
209 memc->delete_trigger(memc, key, key_length);
210 }
211 }
212 }
213 }
214
215 LIBMEMCACHED_MEMCACHED_DELETE_END();
216 return memcached_last_error(memc);
217 }