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/* LibMemcached
* Copyright (C) 2006-2009 Brian Aker
* All rights reserved.
*
* Use and distribution licensed under the BSD license. See
* the COPYING file in the parent directory for full text.
*
* Summary: Change the behavior of the memcached connection.
*
*/
#include "common.h"
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
static bool set_flag(uint64_t data)
{
// Wordy :)
return data ? true : false;
}
static memcached_return_t set_hash(memcached_hash_t *store, memcached_hash_t type)
{
#ifndef HAVE_HSIEH_HASH
if (type == MEMCACHED_HASH_HSIEH)
return MEMCACHED_FAILURE;
#endif
if (type < MEMCACHED_HASH_MAX)
{
*store= type;
}
else
{
return MEMCACHED_FAILURE;
}
return MEMCACHED_SUCCESS;
}
/*
This function is used to modify the behavior of running client.
We quit all connections so we can reset the sockets.
*/
memcached_return_t memcached_behavior_set(memcached_st *ptr,
const memcached_behavior_t flag,
uint64_t data)
{
switch (flag)
{
case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
ptr->number_of_replicas= (uint32_t)data;
break;
case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
ptr->io_msg_watermark= (uint32_t) data;
break;
case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
ptr->io_bytes_watermark= (uint32_t)data;
break;
case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
ptr->io_key_prefetch = (uint32_t)data;
break;
case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
ptr->snd_timeout= (int32_t)data;
break;
case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
ptr->rcv_timeout= (int32_t)data;
break;
case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
ptr->server_failure_limit= (uint32_t)data;
break;
case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
if (data)
{
ptr->flags.verify_key= false;
}
ptr->flags.binary_protocol= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
ptr->flags.support_cas= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_NO_BLOCK:
ptr->flags.no_block= set_flag(data);
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
ptr->flags.buffer_requests= set_flag(data);
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_USE_UDP:
if (memcached_server_count(ptr))
{
return MEMCACHED_FAILURE;
}
ptr->flags.use_udp= set_flag(data);
if (data)
{
ptr->flags.no_reply= set_flag(data);
}
break;
case MEMCACHED_BEHAVIOR_TCP_NODELAY:
ptr->flags.tcp_nodelay= set_flag(data);
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_DISTRIBUTION:
return memcached_behavior_set_distribution(ptr, (memcached_server_distribution_t)data);
case MEMCACHED_BEHAVIOR_KETAMA:
{
if (data)
{
(void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_MD5);
(void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_MD5);
(void)memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
}
else
{
(void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_DEFAULT);
(void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_DEFAULT);
(void)memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_MODULA);
}
break;
}
case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
{
(void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_MD5);
(void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_MD5);
ptr->flags.ketama_weighted= set_flag(data);
/**
@note We try to keep the same distribution going. This should be deprecated and rewritten.
*/
return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
}
case MEMCACHED_BEHAVIOR_HASH:
return memcached_behavior_set_key_hash(ptr, (memcached_hash_t)(data));
case MEMCACHED_BEHAVIOR_KETAMA_HASH:
return memcached_behavior_set_distribution_hash(ptr, (memcached_hash_t)(data));
case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
ptr->flags.use_cache_lookups= set_flag(data);
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_VERIFY_KEY:
if (ptr->flags.binary_protocol)
return MEMCACHED_FAILURE;
ptr->flags.verify_key= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_SORT_HOSTS:
{
ptr->flags.use_sort_hosts= set_flag(data);
run_distribution(ptr);
break;
}
case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
ptr->poll_timeout= (int32_t)data;
break;
case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
ptr->connect_timeout= (int32_t)data;
break;
case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
ptr->retry_timeout= (int32_t)data;
break;
case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
ptr->send_size= (int32_t)data;
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
ptr->recv_size= (int32_t)data;
memcached_quit(ptr);
break;
case MEMCACHED_BEHAVIOR_USER_DATA:
return MEMCACHED_FAILURE;
case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
ptr->flags.hash_with_prefix_key= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_NOREPLY:
ptr->flags.no_reply= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
ptr->flags.auto_eject_hosts= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
srandom((uint32_t) time(NULL));
ptr->flags.randomize_replica_read= set_flag(data);
break;
case MEMCACHED_BEHAVIOR_CORK:
{
memcached_server_instance_st *instance;
bool action= set_flag(data);
if (action == false)
{
ptr->flags.cork= set_flag(false);
return MEMCACHED_SUCCESS;
}
instance= memcached_server_instance_fetch(ptr, 0);
if (! instance)
return MEMCACHED_NO_SERVERS;
/* We just try the first host, and if it is down we return zero */
memcached_return_t rc;
rc= memcached_connect(instance);
if (rc != MEMCACHED_SUCCESS)
{
return rc;
}
/* Now we test! */
memcached_ternary_t enabled;
enabled= test_cork(instance, true);
switch (enabled)
{
case MEM_FALSE:
return ptr->cached_errno ? MEMCACHED_ERRNO : MEMCACHED_FAILURE ;
case MEM_TRUE:
{
enabled= test_cork(instance, false);
if (enabled == false) // Possible bug in OS?
{
memcached_quit_server(instance, false); // We should reset everything on this error.
return MEMCACHED_ERRNO; // Errno will be true because we will have already set it.
}
ptr->flags.cork= true;
ptr->flags.tcp_nodelay= true;
memcached_quit(ptr); // We go on and reset the connections.
}
break;
case MEM_NOT:
default:
return MEMCACHED_NOT_SUPPORTED;
}
}
break;
case MEMCACHED_BEHAVIOR_MAX:
default:
/* Shouldn't get here */
WATCHPOINT_ASSERT(0);
return MEMCACHED_FAILURE;
}
return MEMCACHED_SUCCESS;
}
uint64_t memcached_behavior_get(memcached_st *ptr,
const memcached_behavior_t flag)
{
switch (flag)
{
case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
return ptr->number_of_replicas;
case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
return ptr->io_msg_watermark;
case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
return ptr->io_bytes_watermark;
case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
return ptr->io_key_prefetch;
case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
return ptr->flags.binary_protocol;
case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
return ptr->flags.support_cas;
case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
return ptr->flags.use_cache_lookups;
case MEMCACHED_BEHAVIOR_NO_BLOCK:
return ptr->flags.no_block;
case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
return ptr->flags.buffer_requests;
case MEMCACHED_BEHAVIOR_USE_UDP:
return ptr->flags.use_udp;
case MEMCACHED_BEHAVIOR_TCP_NODELAY:
return ptr->flags.tcp_nodelay;
case MEMCACHED_BEHAVIOR_VERIFY_KEY:
return ptr->flags.verify_key;
case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
return ptr->flags.ketama_weighted;
case MEMCACHED_BEHAVIOR_DISTRIBUTION:
return ptr->distribution;
case MEMCACHED_BEHAVIOR_KETAMA:
return (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA) ? (uint64_t) 1 : 0;
case MEMCACHED_BEHAVIOR_HASH:
return ptr->hash;
case MEMCACHED_BEHAVIOR_KETAMA_HASH:
return ptr->distribution_hash;
case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
return ptr->server_failure_limit;
case MEMCACHED_BEHAVIOR_SORT_HOSTS:
return ptr->flags.use_sort_hosts;
case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
return (uint64_t)ptr->poll_timeout;
case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
return (uint64_t)ptr->connect_timeout;
case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
return (uint64_t)ptr->retry_timeout;
case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
return (uint64_t)ptr->snd_timeout;
case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
return (uint64_t)ptr->rcv_timeout;
case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
{
int sock_size= 0;
socklen_t sock_length= sizeof(int);
memcached_server_instance_st *instance;
if (ptr->send_size != -1) // If value is -1 then we are using the default
return (uint64_t) ptr->send_size;
instance= memcached_server_instance_fetch(ptr, 0);
if (instance) // If we have an instance we test, otherwise we just set and pray
{
/* REFACTOR */
/* We just try the first host, and if it is down we return zero */
if ((memcached_connect(instance)) != MEMCACHED_SUCCESS)
return 0;
if (getsockopt(instance->fd, SOL_SOCKET,
SO_SNDBUF, &sock_size, &sock_length))
return 0; /* Zero means error */
}
return (uint64_t) sock_size;
}
case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
{
int sock_size= 0;
socklen_t sock_length= sizeof(int);
memcached_server_instance_st *instance;
if (ptr->recv_size != -1) // If value is -1 then we are using the default
return (uint64_t) ptr->recv_size;
instance= memcached_server_instance_fetch(ptr, 0);
/**
@note REFACTOR
*/
if (instance)
{
/* We just try the first host, and if it is down we return zero */
if ((memcached_connect(instance)) != MEMCACHED_SUCCESS)
return 0;
if (getsockopt(instance->fd, SOL_SOCKET,
SO_RCVBUF, &sock_size, &sock_length))
return 0; /* Zero means error */
}
return (uint64_t) sock_size;
}
case MEMCACHED_BEHAVIOR_USER_DATA:
return MEMCACHED_FAILURE;
case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
return ptr->flags.hash_with_prefix_key;
case MEMCACHED_BEHAVIOR_NOREPLY:
return ptr->flags.no_reply;
case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
return ptr->flags.auto_eject_hosts;
case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
return ptr->flags.randomize_replica_read;
case MEMCACHED_BEHAVIOR_CORK:
return ptr->flags.cork;
case MEMCACHED_BEHAVIOR_MAX:
default:
WATCHPOINT_ASSERT(0); /* Programming mistake if it gets this far */
return 0;
}
/* NOTREACHED */
}
memcached_return_t memcached_behavior_set_distribution(memcached_st *ptr, memcached_server_distribution_t type)
{
if (type < MEMCACHED_DISTRIBUTION_CONSISTENT_MAX)
{
ptr->distribution= type;
run_distribution(ptr);
}
else
{
return MEMCACHED_FAILURE;
}
return MEMCACHED_SUCCESS;
}
memcached_server_distribution_t memcached_behavior_get_distribution(memcached_st *ptr)
{
return ptr->distribution;
}
memcached_return_t memcached_behavior_set_key_hash(memcached_st *ptr, memcached_hash_t type)
{
return set_hash(&ptr->hash, type);
}
memcached_hash_t memcached_behavior_get_key_hash(memcached_st *ptr)
{
return ptr->hash;
}
memcached_return_t memcached_behavior_set_distribution_hash(memcached_st *ptr, memcached_hash_t type)
{
return set_hash(&ptr->distribution_hash, type);
}
memcached_hash_t memcached_behavior_get_distribution_hash(memcached_st *ptr)
{
return ptr->distribution_hash;
}
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