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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <libmemcached/common.h>
static memcached_return_t ascii_exist(Memcached *memc, org::libmemcached::Instance* instance, const char *key, size_t key_length)
{
libmemcached_io_vector_st vector[]=
{
{ NULL, 0 },
{ memcached_literal_param("add ") },
{ memcached_array_string(memc->_namespace), memcached_array_size(memc->_namespace) },
{ key, key_length },
{ memcached_literal_param(" 0") },
{ memcached_literal_param(" 2678400") },
{ memcached_literal_param(" 0") },
{ memcached_literal_param("\r\n") },
{ memcached_literal_param("\r\n") }
};
/* Send command header */
memcached_return_t rc;
if (memcached_fatal(rc= memcached_vdo(instance, vector, 9, true)))
{
return rc;
}
char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
if (rc == MEMCACHED_NOTSTORED)
{
rc= MEMCACHED_SUCCESS;
}
if (rc == MEMCACHED_STORED)
{
rc= MEMCACHED_NOTFOUND;
}
return rc;
}
static memcached_return_t binary_exist(Memcached *memc, org::libmemcached::Instance* instance, const char *key, size_t key_length)
{
protocol_binary_request_set request= {};
size_t send_length= sizeof(request.bytes);
initialize_binary_request(instance, request.message.header);
request.message.header.request.opcode= PROTOCOL_BINARY_CMD_ADD;
request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(memc->_namespace)));
request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
request.message.header.request.extlen= 8;
request.message.body.flags= 0;
request.message.body.expiration= htonl(2678400);
request.message.header.request.bodylen= htonl((uint32_t) (key_length
+memcached_array_size(memc->_namespace)
+request.message.header.request.extlen));
libmemcached_io_vector_st vector[]=
{
{ NULL, 0 },
{ request.bytes, send_length },
{ memcached_array_string(memc->_namespace), memcached_array_size(memc->_namespace) },
{ key, key_length }
};
/* write the header */
memcached_return_t rc;
if (memcached_fatal(rc= memcached_vdo(instance, vector, 4, true)))
{
return rc;
}
rc= memcached_response(instance, NULL, 0, NULL);
if (rc == MEMCACHED_SUCCESS)
{
rc= MEMCACHED_NOTFOUND;
}
if (rc == MEMCACHED_DATA_EXISTS)
{
rc= MEMCACHED_SUCCESS;
}
return rc;
}
memcached_return_t memcached_exist(memcached_st *memc, const char *key, size_t key_length)
{
return memcached_exist_by_key(memc, key, key_length, key, key_length);
}
memcached_return_t memcached_exist_by_key(memcached_st *shell,
const char *group_key, size_t group_key_length,
const char *key, size_t key_length)
{
Memcached* memc= memcached2Memcached(shell);
memcached_return_t rc;
if (memcached_failed(rc= initialize_query(memc, true)))
{
return rc;
}
if (memcached_is_udp(memc))
{
return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT);
}
uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
org::libmemcached::Instance* instance= memcached_instance_fetch(memc, server_key);
if (memcached_is_binary(memc))
{
rc= binary_exist(memc, instance, key, key_length);
}
else
{
rc= ascii_exist(memc, instance, key, key_length);
}
if (memcached_fatal(rc))
{
memcached_io_reset(instance);
}
return rc;
}
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