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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
* Copyright (C) 2010 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>
namespace {
memcached_return_t send_quit_message(memcached_instance_st* instance)
{
memcached_return_t rc;
if (instance->root->flags.binary_protocol)
{
protocol_binary_request_quit request= {}; // = {.bytes= {0}};
initialize_binary_request(instance, request.message.header);
request.message.header.request.opcode = PROTOCOL_BINARY_CMD_QUIT;
request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
libmemcached_io_vector_st vector[]=
{
{ request.bytes, sizeof(request.bytes) }
};
rc= memcached_vdo(instance, vector, 1, true);
}
else
{
libmemcached_io_vector_st vector[]=
{
{ memcached_literal_param("quit\r\n") }
};
rc= memcached_vdo(instance, vector, 1, true);
}
return rc;
}
void drain_instance(memcached_instance_st* instance)
{
/* read until socket is closed, or there is an error
* closing the socket before all data is read
* results in server throwing away all data which is
* not read
*
* In .40 we began to only do this if we had been doing buffered
* requests of had replication enabled.
*/
if (instance->root->flags.buffer_requests or instance->root->number_of_replicas)
{
memcached_io_slurp(instance);
}
/*
* memcached_io_read may call memcached_quit_server with io_death if
* it encounters problems, but we don't care about those occurences.
* The intention of that loop is to drain the data sent from the
* server to ensure that the server processed all of the data we
* sent to the server.
*/
instance->server_failure_counter= 0;
}
}
/*
This closes all connections (forces flush of input as well).
Maybe add a host specific, or key specific version?
The reason we send "quit" is that in case we have buffered IO, this
will force data to be completed.
*/
void memcached_quit_server(memcached_instance_st* instance, bool io_death)
{
if (instance->valid())
{
if (io_death == false and memcached_is_udp(instance->root) == false and instance->is_shutting_down() == false)
{
send_quit_message(instance);
instance->start_close_socket();
drain_instance(instance);
}
}
instance->close_socket();
if (io_death)
{
memcached_mark_server_for_timeout(instance);
}
}
void send_quit(Memcached *memc)
{
for (uint32_t x= 0; x < memcached_server_count(memc); x++)
{
memcached_instance_st* instance= memcached_instance_fetch(memc, x);
memcached_quit_server(instance, false);
}
}
void memcached_quit(memcached_st *shell)
{
Memcached* memc= memcached2Memcached(shell);
memcached_return_t rc;
if (memcached_failed(rc= initialize_query(memc, true)))
{
return;
}
send_quit(memc);
}
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