1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2009 Brian Aker All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
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13 * notice, this list of conditions and the following disclaimer.
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
20 * * The names of its contributors may not be used to endorse or
21 * promote products derived from this software without specific prior
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,
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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34 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 #include <libmemcached/common.h>
39 #include <libmemcached/memcached/protocol_binary.h>
41 memcached_return_t
memcached_delete(memcached_st
*ptr
, const char *key
, size_t key_length
,
44 return memcached_delete_by_key(ptr
, key
, key_length
, key
, key_length
, expiration
);
47 static inline memcached_return_t
ascii_delete(memcached_st
*ptr
,
48 memcached_server_write_instance_st instance
,
55 struct libmemcached_io_vector_st vector
[]=
57 { memcached_literal_param("delete ") },
58 { memcached_array_string(ptr
->_namespace
), memcached_array_size(ptr
->_namespace
) },
60 { " noreply", reply
? 0 : memcached_literal_param_size(" noreply") },
61 { memcached_literal_param("\r\n") }
64 if (memcached_is_udp(instance
->root
))
66 size_t send_length
= io_vector_total_size(vector
, 5);
68 if (send_length
> MAX_UDP_DATAGRAM_LENGTH
- UDP_DATAGRAM_HEADER_LENGTH
)
70 return MEMCACHED_WRITE_FAILURE
;
73 if (send_length
+instance
->write_buffer_offset
> MAX_UDP_DATAGRAM_LENGTH
)
75 memcached_io_write(instance
, NULL
, 0, true);
79 /* Send command header */
80 return memcached_vdo(instance
, vector
, 5, flush
);
83 static inline memcached_return_t
binary_delete(memcached_st
*ptr
,
84 memcached_server_write_instance_st instance
,
91 protocol_binary_request_delete request
= {};
93 request
.message
.header
.request
.magic
= PROTOCOL_BINARY_REQ
;
96 request
.message
.header
.request
.opcode
= PROTOCOL_BINARY_CMD_DELETE
;
100 request
.message
.header
.request
.opcode
= PROTOCOL_BINARY_CMD_DELETEQ
;
102 request
.message
.header
.request
.keylen
= htons((uint16_t)(key_length
+ memcached_array_size(ptr
->_namespace
)));
103 request
.message
.header
.request
.datatype
= PROTOCOL_BINARY_RAW_BYTES
;
104 request
.message
.header
.request
.bodylen
= htonl((uint32_t)(key_length
+ memcached_array_size(ptr
->_namespace
)));
106 if (ptr
->flags
.use_udp
and flush
== false)
108 size_t cmd_size
= sizeof(request
.bytes
) + key_length
;
109 if (cmd_size
> MAX_UDP_DATAGRAM_LENGTH
- UDP_DATAGRAM_HEADER_LENGTH
)
111 return MEMCACHED_WRITE_FAILURE
;
114 if (cmd_size
+instance
->write_buffer_offset
> MAX_UDP_DATAGRAM_LENGTH
)
116 memcached_io_write(instance
, NULL
, 0, true);
120 struct libmemcached_io_vector_st vector
[]=
122 { request
.bytes
, sizeof(request
.bytes
) },
123 { memcached_array_string(ptr
->_namespace
), memcached_array_size(ptr
->_namespace
) },
127 memcached_return_t rc
= MEMCACHED_SUCCESS
;
129 if ((rc
= memcached_vdo(instance
, vector
, 3, flush
)) != MEMCACHED_SUCCESS
)
131 memcached_io_reset(instance
);
134 if (ptr
->number_of_replicas
> 0)
136 request
.message
.header
.request
.opcode
= PROTOCOL_BINARY_CMD_DELETEQ
;
138 for (uint32_t x
= 0; x
< ptr
->number_of_replicas
; ++x
)
140 memcached_server_write_instance_st replica
;
143 if (server_key
== memcached_server_count(ptr
))
146 replica
= memcached_server_instance_fetch(ptr
, server_key
);
148 if (memcached_vdo(replica
, vector
, 3, flush
) != MEMCACHED_SUCCESS
)
150 memcached_io_reset(replica
);
154 memcached_server_response_decrement(replica
);
162 memcached_return_t
memcached_delete_by_key(memcached_st
*ptr
,
163 const char *group_key
, size_t group_key_length
,
164 const char *key
, size_t key_length
,
167 LIBMEMCACHED_MEMCACHED_DELETE_START();
169 memcached_return_t rc
;
170 if (memcached_failed(rc
= initialize_query(ptr
)))
175 rc
= memcached_validate_key_length(key_length
, ptr
->flags
.binary_protocol
);
176 if (memcached_failed(rc
))
183 return memcached_set_error(*ptr
, MEMCACHED_INVALID_ARGUMENTS
, MEMCACHED_AT
,
184 memcached_literal_param("Memcached server version does not allow expiration of deleted items"));
187 // If a delete trigger exists, we need a response, so no buffering/noreply
188 if (ptr
->delete_trigger
)
190 if (ptr
->flags
.buffer_requests
)
192 return memcached_set_error(*ptr
, MEMCACHED_INVALID_ARGUMENTS
, MEMCACHED_AT
,
193 memcached_literal_param("Delete triggers cannot be used if buffering is enabled"));
196 if (ptr
->flags
.no_reply
)
198 return memcached_set_error(*ptr
, MEMCACHED_INVALID_ARGUMENTS
, MEMCACHED_AT
,
199 memcached_literal_param("Delete triggers cannot be used if MEMCACHED_BEHAVIOR_NOREPLY is set"));
204 uint32_t server_key
= memcached_generate_hash_with_redistribution(ptr
, group_key
, group_key_length
);
205 memcached_server_write_instance_st instance
= memcached_server_instance_fetch(ptr
, server_key
);
207 bool to_write
= (ptr
->flags
.buffer_requests
) ? false : true;
209 // Invert the logic to make it simpler to read the code
210 bool reply
= (ptr
->flags
.no_reply
) ? false : true;
212 if (ptr
->flags
.binary_protocol
)
214 rc
= binary_delete(ptr
, instance
, server_key
, key
, key_length
, reply
, to_write
);
218 rc
= ascii_delete(ptr
, instance
, server_key
, key
, key_length
, reply
, to_write
);
221 if (rc
== MEMCACHED_SUCCESS
)
223 if (to_write
== false)
225 rc
= MEMCACHED_BUFFERED
;
229 char buffer
[MEMCACHED_DEFAULT_COMMAND_SIZE
];
230 rc
= memcached_response(instance
, buffer
, MEMCACHED_DEFAULT_COMMAND_SIZE
, NULL
);
231 if (rc
== MEMCACHED_DELETED
)
233 rc
= MEMCACHED_SUCCESS
;
237 if (rc
== MEMCACHED_SUCCESS
and ptr
->delete_trigger
)
239 ptr
->delete_trigger(ptr
, key
, key_length
);
243 LIBMEMCACHED_MEMCACHED_DELETE_END();