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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
* Copyright (C) 2006-2009 Brian Aker All rights reserved.
*
* 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>
#include <libmemcached/memcached/protocol_binary.h>
memcached_return_t memcached_delete(memcached_st *shell, const char *key, size_t key_length,
time_t expiration)
{
return memcached_delete_by_key(shell, key, key_length, key, key_length, expiration);
}
static inline memcached_return_t ascii_delete(memcached_instance_st* instance,
uint32_t ,
const char *key,
const size_t key_length,
const bool reply,
const bool is_buffering)
{
libmemcached_io_vector_st vector[]=
{
{ NULL, 0 },
{ memcached_literal_param("delete ") },
{ memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
{ key, key_length },
{ " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
{ memcached_literal_param("\r\n") }
};
/* Send command header, only flush if we are NOT buffering */
return memcached_vdo(instance, vector, 6, is_buffering ? false : true);
}
static inline memcached_return_t binary_delete(memcached_instance_st* instance,
uint32_t server_key,
const char *key,
const size_t key_length,
const bool reply,
const bool is_buffering)
{
protocol_binary_request_delete request= {};
bool should_flush= is_buffering ? false : true;
initialize_binary_request(instance, request.message.header);
if (reply)
{
request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
}
else
{
request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
}
request.message.header.request.keylen= htons(uint16_t(key_length + memcached_array_size(instance->root->_namespace)));
request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
request.message.header.request.bodylen= htonl(uint32_t(key_length + memcached_array_size(instance->root->_namespace)));
libmemcached_io_vector_st vector[]=
{
{ NULL, 0 },
{ request.bytes, sizeof(request.bytes) },
{ memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
{ key, key_length }
};
memcached_return_t rc;
if (memcached_fatal(rc= memcached_vdo(instance, vector, 4, should_flush)))
{
assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
memcached_io_reset(instance);
}
if (memcached_has_replicas(instance))
{
request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
for (uint32_t x= 0; x < memcached_has_replicas(instance); ++x)
{
++server_key;
if (server_key == memcached_server_count(instance->root))
{
server_key= 0;
}
memcached_instance_st* replica= memcached_instance_fetch(instance->root, server_key);
if (memcached_fatal(memcached_vdo(replica, vector, 4, should_flush)))
{
assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
memcached_io_reset(replica);
}
else
{
memcached_server_response_decrement(replica);
}
}
}
return rc;
}
memcached_return_t memcached_delete_by_key(memcached_st *shell,
const char *group_key, size_t group_key_length,
const char *key, size_t key_length,
time_t expiration)
{
Memcached* memc= memcached2Memcached(shell);
LIBMEMCACHED_MEMCACHED_DELETE_START();
memcached_return_t rc;
if (memcached_fatal(rc= initialize_query(memc, true)))
{
return rc;
}
if (memcached_fatal(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
{
return memcached_last_error(memc);
}
if (expiration)
{
return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
memcached_literal_param("Memcached server version does not allow expiration of deleted items"));
}
uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
memcached_instance_st* instance= memcached_instance_fetch(memc, server_key);
bool is_buffering= memcached_is_buffering(instance->root);
bool is_replying= memcached_is_replying(instance->root);
// If a delete trigger exists, we need a response, so no buffering/noreply
if (memc->delete_trigger)
{
if (is_buffering)
{
return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
memcached_literal_param("Delete triggers cannot be used if buffering is enabled"));
}
if (is_replying == false)
{
return memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
memcached_literal_param("Delete triggers cannot be used if MEMCACHED_BEHAVIOR_NOREPLY is set"));
}
}
if (memcached_is_binary(memc))
{
rc= binary_delete(instance, server_key, key, key_length, is_replying, is_buffering);
}
else
{
rc= ascii_delete(instance, server_key, key, key_length, is_replying, is_buffering);
}
if (rc == MEMCACHED_SUCCESS)
{
if (is_buffering == true)
{
rc= MEMCACHED_BUFFERED;
}
else if (is_replying == false)
{
rc= MEMCACHED_SUCCESS;
}
else
{
char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
if (rc == MEMCACHED_DELETED)
{
rc= MEMCACHED_SUCCESS;
if (memc->delete_trigger)
{
memc->delete_trigger(memc, key, key_length);
}
}
}
}
LIBMEMCACHED_MEMCACHED_DELETE_END();
return rc;
}
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