/* 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>
static void auto_response(memcached_instance_st* instance, const bool reply, memcached_return_t& rc, uint64_t* value)
{
// If the message was successfully sent, then get the response, otherwise
// fail.
if (memcached_success(rc))
{
if (reply == false)
{
*value= UINT64_MAX;
return;
}
rc= memcached_response(instance, &instance->root->result);
}
if (memcached_fatal(rc))
{
assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
*value= UINT64_MAX;
}
else if (memcached_failed(rc))
{
*value= UINT64_MAX;
}
else
{
assert(memcached_last_error(instance->root) != MEMCACHED_NOTFOUND);
*value= instance->root->result.numeric_value;
}
}
static memcached_return_t text_incr_decr(memcached_instance_st* instance,
const bool is_incr,
const char *key, size_t key_length,
const uint64_t offset,
const bool reply)
{
char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
if (size_t(send_length) >= sizeof(buffer) or send_length < 0)
{
return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
}
libmemcached_io_vector_st vector[]=
{
{ NULL, 0 },
{ memcached_literal_param("incr ") },
{ memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
{ key, key_length },
{ buffer, size_t(send_length) },
{ " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
{ memcached_literal_param("\r\n") }
};
if (is_incr == false)
{
vector[1].buffer= "decr ";
}
return memcached_vdo(instance, vector, 7, true);
}
static memcached_return_t binary_incr_decr(memcached_instance_st* instance,
protocol_binary_command cmd,
const char *key, const size_t key_length,
const uint64_t offset,
const uint64_t initial,
const uint32_t expiration,
const bool reply)
{
if (reply == false)
{
if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
{
cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
}
if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
{
cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
}
}
protocol_binary_request_incr request= {}; // = {.bytes= {0}};
initialize_binary_request(instance, request.message.header);
request.message.header.request.opcode= cmd;
request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
request.message.header.request.extlen= 20;
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) +request.message.header.request.extlen));
request.message.body.delta= memcached_htonll(offset);
request.message.body.initial= memcached_htonll(initial);
request.message.body.expiration= htonl((uint32_t) expiration);
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 }
};
return memcached_vdo(instance, vector, 4, true);
}
memcached_return_t memcached_increment(memcached_st *memc,
const char *key, size_t key_length,
uint32_t offset,
uint64_t *value)
{
return memcached_increment_by_key(memc, key, key_length, key, key_length, offset, value);
}
static memcached_return_t increment_decrement_by_key(const protocol_binary_command command,
Memcached *memc,
const char *group_key, size_t group_key_length,
const char *key, size_t key_length,
uint64_t offset,
uint64_t *value)
{
uint64_t local_value;
if (value == NULL)
{
value= &local_value;
}
memcached_return_t rc;
if (memcached_failed(rc= initialize_query(memc, true)))
{
return rc;
}
if (memcached_is_encrypted(memc))
{
return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
memcached_literal_param("Operation not allowed while encyrption is enabled"));
}
if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
{
return memcached_last_error(memc);
}
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 reply= memcached_is_replying(instance->root);
if (memcached_is_binary(memc))
{
rc= binary_incr_decr(instance, command,
key, key_length,
uint64_t(offset), 0, MEMCACHED_EXPIRATION_NOT_ADD,
reply);
}
else
{
rc= text_incr_decr(instance,
command == PROTOCOL_BINARY_CMD_INCREMENT ? true : false,
key, key_length,
offset, reply);
}
auto_response(instance, reply, rc, value);
return rc;
}
static memcached_return_t increment_decrement_with_initial_by_key(const protocol_binary_command command,
Memcached *memc,
const char *group_key,
size_t group_key_length,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value)
{
uint64_t local_value;
if (value == NULL)
{
value= &local_value;
}
memcached_return_t rc;
if (memcached_failed(rc= initialize_query(memc, true)))
{
return rc;
}
if (memcached_is_encrypted(memc))
{
return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
memcached_literal_param("Operation not allowed while encyrption is enabled"));
}
if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
{
return memcached_last_error(memc);
}
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 reply= memcached_is_replying(instance->root);
if (memcached_is_binary(memc))
{
rc= binary_incr_decr(instance, command,
key, key_length,
offset, initial, uint32_t(expiration),
reply);
}
else
{
rc= memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
memcached_literal_param("memcached_increment_with_initial_by_key() is not supported via the ASCII protocol"));
}
auto_response(instance, reply, rc, value);
return rc;
}
memcached_return_t memcached_decrement(memcached_st *memc,
const char *key, size_t key_length,
uint32_t offset,
uint64_t *value)
{
return memcached_decrement_by_key(memc, key, key_length, key, key_length, offset, value);
}
memcached_return_t memcached_increment_by_key(memcached_st *shell,
const char *group_key, size_t group_key_length,
const char *key, size_t key_length,
uint64_t offset,
uint64_t *value)
{
Memcached* memc= memcached2Memcached(shell);
LIBMEMCACHED_MEMCACHED_INCREMENT_START();
memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
memc,
group_key, group_key_length,
key, key_length,
offset, value);
LIBMEMCACHED_MEMCACHED_INCREMENT_END();
return rc;
}
memcached_return_t memcached_decrement_by_key(memcached_st *shell,
const char *group_key, size_t group_key_length,
const char *key, size_t key_length,
uint64_t offset,
uint64_t *value)
{
Memcached* memc= memcached2Memcached(shell);
LIBMEMCACHED_MEMCACHED_DECREMENT_START();
memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
memc,
group_key, group_key_length,
key, key_length,
offset, value);
LIBMEMCACHED_MEMCACHED_DECREMENT_END();
return rc;
}
memcached_return_t memcached_increment_with_initial(memcached_st *memc,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value)
{
return memcached_increment_with_initial_by_key(memc, key, key_length,
key, key_length,
offset, initial, expiration, value);
}
memcached_return_t memcached_increment_with_initial_by_key(memcached_st *shell,
const char *group_key,
size_t group_key_length,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value)
{
LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
Memcached* memc= memcached2Memcached(shell);
memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
memc,
group_key, group_key_length,
key, key_length,
offset, initial, expiration, value);
LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
return rc;
}
memcached_return_t memcached_decrement_with_initial(memcached_st *memc,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value)
{
return memcached_decrement_with_initial_by_key(memc, key, key_length,
key, key_length,
offset, initial, expiration, value);
}
memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *shell,
const char *group_key,
size_t group_key_length,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value)
{
LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
Memcached* memc= memcached2Memcached(shell);
memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
memc,
group_key, group_key_length,
key, key_length,
offset, initial, expiration, value);
LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
return rc;
}