2 * Copyright (C) 2006-2009 Brian Aker
5 * Use and distribution licensed under the BSD license. See
6 * the COPYING file in the parent directory for full text.
8 * Summary: Methods for adding or decrementing values from an object in memcached
14 static memcached_return_t
text_incr_decr(memcached_st
*ptr
,
16 const char *master_key
, size_t master_key_length
,
17 const char *key
, size_t key_length
,
21 memcached_return_t rc
;
22 char buffer
[MEMCACHED_DEFAULT_COMMAND_SIZE
];
24 memcached_server_write_instance_st instance
;
25 bool no_reply
= ptr
->flags
.no_reply
;
27 if (memcached_server_count(ptr
) == 0)
28 return memcached_set_error(ptr
, MEMCACHED_NO_SERVERS
, NULL
);
30 if (ptr
->flags
.verify_key
&& (memcached_key_test((const char **)&key
, &key_length
, 1) == MEMCACHED_BAD_KEY_PROVIDED
))
31 return MEMCACHED_BAD_KEY_PROVIDED
;
33 server_key
= memcached_generate_hash_with_redistribution(ptr
, master_key
, master_key_length
);
34 instance
= memcached_server_instance_fetch(ptr
, server_key
);
37 send_length
= snprintf(buffer
, MEMCACHED_DEFAULT_COMMAND_SIZE
,
38 "%s %.*s%.*s %" PRIu64
"%s\r\n", verb
,
39 (int)ptr
->prefix_key_length
,
42 offset
, no_reply
? " noreply" : "");
43 if (send_length
>= MEMCACHED_DEFAULT_COMMAND_SIZE
|| send_length
< 0)
44 return MEMCACHED_WRITE_FAILURE
;
46 rc
= memcached_do(instance
, buffer
, (size_t)send_length
, true);
47 if (no_reply
|| rc
!= MEMCACHED_SUCCESS
)
50 rc
= memcached_response(instance
, buffer
, MEMCACHED_DEFAULT_COMMAND_SIZE
, NULL
);
53 So why recheck responce? Because the protocol is brain dead :)
54 The number returned might end up equaling one of the string
55 values. Less chance of a mistake with strncmp() so we will
56 use it. We still called memcached_response() though since it
57 worked its magic for non-blocking IO.
59 if (! strncmp(buffer
, "ERROR\r\n", 7))
62 rc
= MEMCACHED_PROTOCOL_ERROR
;
64 else if (! strncmp(buffer
, "CLIENT_ERROR\r\n", 14))
67 rc
= MEMCACHED_PROTOCOL_ERROR
;
69 else if (!strncmp(buffer
, "NOT_FOUND\r\n", 11))
72 rc
= MEMCACHED_NOTFOUND
;
76 *value
= strtoull(buffer
, (char **)NULL
, 10);
77 rc
= MEMCACHED_SUCCESS
;
83 static memcached_return_t
binary_incr_decr(memcached_st
*ptr
, uint8_t cmd
,
84 const char *master_key
, size_t master_key_length
,
85 const char *key
, size_t key_length
,
86 uint64_t offset
, uint64_t initial
,
91 memcached_server_write_instance_st instance
;
92 bool no_reply
= ptr
->flags
.no_reply
;
94 if (memcached_server_count(ptr
) == 0)
95 return memcached_set_error(ptr
, MEMCACHED_NO_SERVERS
, NULL
);
97 server_key
= memcached_generate_hash_with_redistribution(ptr
, master_key
, master_key_length
);
98 instance
= memcached_server_instance_fetch(ptr
, server_key
);
102 if(cmd
== PROTOCOL_BINARY_CMD_DECREMENT
)
103 cmd
= PROTOCOL_BINARY_CMD_DECREMENTQ
;
104 if(cmd
== PROTOCOL_BINARY_CMD_INCREMENT
)
105 cmd
= PROTOCOL_BINARY_CMD_INCREMENTQ
;
107 protocol_binary_request_incr request
= {.bytes
= {0}};
109 request
.message
.header
.request
.magic
= PROTOCOL_BINARY_REQ
;
110 request
.message
.header
.request
.opcode
= cmd
;
111 request
.message
.header
.request
.keylen
= htons((uint16_t)(key_length
+ ptr
->prefix_key_length
));
112 request
.message
.header
.request
.extlen
= 20;
113 request
.message
.header
.request
.datatype
= PROTOCOL_BINARY_RAW_BYTES
;
114 request
.message
.header
.request
.bodylen
= htonl((uint32_t)(key_length
+ ptr
->prefix_key_length
+ request
.message
.header
.request
.extlen
));
115 request
.message
.body
.delta
= htonll(offset
);
116 request
.message
.body
.initial
= htonll(initial
);
117 request
.message
.body
.expiration
= htonl((uint32_t) expiration
);
119 struct libmemcached_io_vector_st vector
[]=
121 { .length
= sizeof(request
.bytes
), .buffer
= request
.bytes
},
122 { .length
= ptr
->prefix_key_length
, .buffer
= ptr
->prefix_key
},
123 { .length
= key_length
, .buffer
= key
}
126 memcached_return_t rc
;
127 if ((rc
= memcached_vdo(instance
, vector
, 3, true)) != MEMCACHED_SUCCESS
)
129 memcached_io_reset(instance
);
130 return (rc
== MEMCACHED_SUCCESS
) ? MEMCACHED_WRITE_FAILURE
: rc
;
134 return MEMCACHED_SUCCESS
;
135 return memcached_response(instance
, (char*)value
, sizeof(*value
), NULL
);
138 memcached_return_t
memcached_increment(memcached_st
*ptr
,
139 const char *key
, size_t key_length
,
143 uint64_t local_value
;
147 return memcached_increment_by_key(ptr
, key
, key_length
, key
, key_length
, offset
, value
);
150 memcached_return_t
memcached_decrement(memcached_st
*ptr
,
151 const char *key
, size_t key_length
,
155 uint64_t local_value
;
159 return memcached_decrement_by_key(ptr
, key
, key_length
, key
, key_length
, offset
, value
);
162 memcached_return_t
memcached_increment_by_key(memcached_st
*ptr
,
163 const char *master_key
, size_t master_key_length
,
164 const char *key
, size_t key_length
,
168 memcached_return_t rc
= memcached_validate_key_length(key_length
, ptr
->flags
.binary_protocol
);
169 unlikely (rc
!= MEMCACHED_SUCCESS
)
172 uint64_t local_value
;
176 LIBMEMCACHED_MEMCACHED_INCREMENT_START();
177 if (ptr
->flags
.binary_protocol
)
179 rc
= binary_incr_decr(ptr
, PROTOCOL_BINARY_CMD_INCREMENT
,
180 master_key
, master_key_length
, key
, key_length
,
181 (uint64_t)offset
, 0, MEMCACHED_EXPIRATION_NOT_ADD
,
186 rc
= text_incr_decr(ptr
, "incr", master_key
, master_key_length
, key
, key_length
, offset
, value
);
189 LIBMEMCACHED_MEMCACHED_INCREMENT_END();
194 memcached_return_t
memcached_decrement_by_key(memcached_st
*ptr
,
195 const char *master_key
, size_t master_key_length
,
196 const char *key
, size_t key_length
,
200 memcached_return_t rc
= memcached_validate_key_length(key_length
, ptr
->flags
.binary_protocol
);
201 unlikely (rc
!= MEMCACHED_SUCCESS
)
204 uint64_t local_value
;
208 LIBMEMCACHED_MEMCACHED_DECREMENT_START();
209 if (ptr
->flags
.binary_protocol
)
211 rc
= binary_incr_decr(ptr
, PROTOCOL_BINARY_CMD_DECREMENT
,
212 master_key
, master_key_length
, key
, key_length
,
213 (uint64_t)offset
, 0, MEMCACHED_EXPIRATION_NOT_ADD
,
218 rc
= text_incr_decr(ptr
, "decr", master_key
, master_key_length
, key
, key_length
, offset
, value
);
221 LIBMEMCACHED_MEMCACHED_DECREMENT_END();
226 memcached_return_t
memcached_increment_with_initial(memcached_st
*ptr
,
234 uint64_t local_value
;
238 return memcached_increment_with_initial_by_key(ptr
, key
, key_length
,
240 offset
, initial
, expiration
, value
);
243 memcached_return_t
memcached_increment_with_initial_by_key(memcached_st
*ptr
,
244 const char *master_key
,
245 size_t master_key_length
,
253 memcached_return_t rc
= memcached_validate_key_length(key_length
, ptr
->flags
.binary_protocol
);
254 unlikely (rc
!= MEMCACHED_SUCCESS
)
257 uint64_t local_value
;
261 LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
262 if (ptr
->flags
.binary_protocol
)
263 rc
= binary_incr_decr(ptr
, PROTOCOL_BINARY_CMD_INCREMENT
,
264 master_key
, master_key_length
, key
, key_length
,
265 offset
, initial
, (uint32_t)expiration
,
268 rc
= MEMCACHED_PROTOCOL_ERROR
;
270 LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
275 memcached_return_t
memcached_decrement_with_initial(memcached_st
*ptr
,
283 uint64_t local_value
;
287 return memcached_decrement_with_initial_by_key(ptr
, key
, key_length
,
289 offset
, initial
, expiration
, value
);
292 memcached_return_t
memcached_decrement_with_initial_by_key(memcached_st
*ptr
,
293 const char *master_key
,
294 size_t master_key_length
,
302 memcached_return_t rc
= memcached_validate_key_length(key_length
, ptr
->flags
.binary_protocol
);
303 unlikely (rc
!= MEMCACHED_SUCCESS
)
306 uint64_t local_value
;
310 LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
311 if (ptr
->flags
.binary_protocol
)
313 rc
= binary_incr_decr(ptr
, PROTOCOL_BINARY_CMD_DECREMENT
,
314 master_key
, master_key_length
, key
, key_length
,
315 offset
, initial
, (uint32_t)expiration
,
320 rc
= MEMCACHED_PROTOCOL_ERROR
;
323 LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();