--- /dev/null
- ptr->ketama.continuum[continuum_index].index= host_index;
- ptr->ketama.continuum[continuum_index++].value= value;
+ /* LibMemcached
+ * Copyright (C) 2006-2010 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:
+ *
+ */
+
+ #include "common.h"
+ #include <math.h>
+
+ /* Protoypes (static) */
+ static memcached_return_t server_add(memcached_st *ptr, const char *hostname,
+ in_port_t port,
+ uint32_t weight,
+ memcached_connection_t type);
+
+ static memcached_return_t update_continuum(memcached_st *ptr);
+
+ static int compare_servers(const void *p1, const void *p2)
+ {
+ int return_value;
+ memcached_server_instance_st a= (memcached_server_instance_st)p1;
+ memcached_server_instance_st b= (memcached_server_instance_st)p2;
+
+ return_value= strcmp(a->hostname, b->hostname);
+
+ if (return_value == 0)
+ {
+ return_value= (int) (a->port - b->port);
+ }
+
+ return return_value;
+ }
+
+ static void sort_hosts(memcached_st *ptr)
+ {
+ if (memcached_server_count(ptr))
+ {
+ memcached_server_write_instance_st instance;
+
+ qsort(memcached_server_list(ptr), memcached_server_count(ptr), sizeof(memcached_server_st), compare_servers);
+ instance= memcached_server_instance_fetch(ptr, 0);
+ instance->number_of_hosts= memcached_server_count(ptr);
+ }
+ }
+
+
+ memcached_return_t run_distribution(memcached_st *ptr)
+ {
+ if (ptr->flags.use_sort_hosts)
+ sort_hosts(ptr);
+
+ switch (ptr->distribution)
+ {
+ case MEMCACHED_DISTRIBUTION_CONSISTENT:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED:
+ return update_continuum(ptr);
+ case MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET:
+ case MEMCACHED_DISTRIBUTION_MODULA:
+ break;
+ case MEMCACHED_DISTRIBUTION_RANDOM:
+ srandom((uint32_t) time(NULL));
+ break;
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX:
+ default:
+ WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
+ }
+
+ return MEMCACHED_SUCCESS;
+ }
+
+ static uint32_t ketama_server_hash(const char *key, size_t key_length, uint32_t alignment)
+ {
+ unsigned char results[16];
+
+ libhashkit_md5_signature((unsigned char*)key, key_length, results);
+
+ return ((uint32_t) (results[3 + alignment * 4] & 0xFF) << 24)
+ | ((uint32_t) (results[2 + alignment * 4] & 0xFF) << 16)
+ | ((uint32_t) (results[1 + alignment * 4] & 0xFF) << 8)
+ | (results[0 + alignment * 4] & 0xFF);
+ }
+
+ static int continuum_item_cmp(const void *t1, const void *t2)
+ {
+ memcached_continuum_item_st *ct1= (memcached_continuum_item_st *)t1;
+ memcached_continuum_item_st *ct2= (memcached_continuum_item_st *)t2;
+
+ /* Why 153? Hmmm... */
+ WATCHPOINT_ASSERT(ct1->value != 153);
+ if (ct1->value == ct2->value)
+ return 0;
+ else if (ct1->value > ct2->value)
+ return 1;
+ else
+ return -1;
+ }
+
+ static memcached_return_t update_continuum(memcached_st *ptr)
+ {
+ uint32_t continuum_index= 0;
+ memcached_server_st *list;
+ uint32_t pointer_counter= 0;
+ uint32_t pointer_per_server= MEMCACHED_POINTS_PER_SERVER;
+ uint32_t pointer_per_hash= 1;
+ uint32_t live_servers= 0;
+ struct timeval now;
+
+ if (gettimeofday(&now, NULL) != 0)
+ {
+ memcached_set_errno(ptr, errno, NULL);
+ return MEMCACHED_ERRNO;
+ }
+
+ list= memcached_server_list(ptr);
+
+ /* count live servers (those without a retry delay set) */
+ bool is_auto_ejecting= _is_auto_eject_host(ptr);
+ if (is_auto_ejecting)
+ {
+ live_servers= 0;
+ ptr->ketama.next_distribution_rebuild= 0;
+ for (uint32_t host_index= 0; host_index < memcached_server_count(ptr); ++host_index)
+ {
+ if (list[host_index].next_retry <= now.tv_sec)
+ live_servers++;
+ else
+ {
+ if (ptr->ketama.next_distribution_rebuild == 0 || list[host_index].next_retry < ptr->ketama.next_distribution_rebuild)
+ ptr->ketama.next_distribution_rebuild= list[host_index].next_retry;
+ }
+ }
+ }
+ else
+ {
+ live_servers= memcached_server_count(ptr);
+ }
+
+ uint64_t is_ketama_weighted= memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED);
+ uint32_t points_per_server= (uint32_t) (is_ketama_weighted ? MEMCACHED_POINTS_PER_SERVER_KETAMA : MEMCACHED_POINTS_PER_SERVER);
+
+ if (live_servers == 0)
+ return MEMCACHED_SUCCESS;
+
+ if (live_servers > ptr->ketama.continuum_count)
+ {
+ memcached_continuum_item_st *new_ptr;
+
+ new_ptr= static_cast<memcached_continuum_item_st*>(libmemcached_realloc(ptr, ptr->ketama.continuum,
+ sizeof(memcached_continuum_item_st) * (live_servers + MEMCACHED_CONTINUUM_ADDITION) * points_per_server));
+
+ if (new_ptr == 0)
+ return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+
+ ptr->ketama.continuum= new_ptr;
+ ptr->ketama.continuum_count= live_servers + MEMCACHED_CONTINUUM_ADDITION;
+ }
+
+ uint64_t total_weight= 0;
+ if (is_ketama_weighted)
+ {
+ for (uint32_t host_index = 0; host_index < memcached_server_count(ptr); ++host_index)
+ {
+ if (! is_auto_ejecting || list[host_index].next_retry <= now.tv_sec)
+ {
+ total_weight += list[host_index].weight;
+ }
+ }
+ }
+
+ for (uint32_t host_index= 0; host_index < memcached_server_count(ptr); ++host_index)
+ {
+ if (is_auto_ejecting && list[host_index].next_retry > now.tv_sec)
+ continue;
+
+ if (is_ketama_weighted)
+ {
+ float pct = (float)list[host_index].weight / (float)total_weight;
+ pointer_per_server= (uint32_t) ((floorf((float) (pct * MEMCACHED_POINTS_PER_SERVER_KETAMA / 4 * (float)live_servers + 0.0000000001))) * 4);
+ pointer_per_hash= 4;
+ #ifdef DEBUG
+ printf("ketama_weighted:%s|%d|%llu|%u\n",
+ list[host_index].hostname,
+ list[host_index].port,
+ (unsigned long long)list[host_index].weight,
+ pointer_per_server);
+ #endif
+ }
+
+
+ if (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY)
+ {
+ for (uint32_t pointer_index= 0;
+ pointer_index < pointer_per_server / pointer_per_hash;
+ pointer_index++)
+ {
+ char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
+ int sort_host_length;
+
+ // Spymemcached ketema key format is: hostname/ip:port-index
+ // If hostname is not available then: /ip:port-index
+ sort_host_length= snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "/%s:%u-%u",
+ list[host_index].hostname,
+ (uint32_t)list[host_index].port,
+ pointer_index);
+
+ if (sort_host_length >= MEMCACHED_MAX_HOST_SORT_LENGTH || sort_host_length < 0)
+ {
+ return MEMCACHED_FAILURE;
+ }
+ #ifdef DEBUG
+ printf("update_continuum: key is %s\n", sort_host);
+ #endif
+
+ WATCHPOINT_ASSERT(sort_host_length);
+
+ if (is_ketama_weighted)
+ {
+ for (uint32_t x= 0; x < pointer_per_hash; x++)
+ {
+ uint32_t value= ketama_server_hash(sort_host, (size_t)sort_host_length, x);
- uint32_t value= ketama_server_hash(sort_host, (size_t)sort_host_length, x);
- ptr->ketama.continuum[continuum_index].index= host_index;
- ptr->ketama.continuum[continuum_index++].value= value;
++ ptr->ketama.continuum[continuum_index].index= host_index;
++ ptr->ketama.continuum[continuum_index++].value= value;
+ }
+ }
+ else
+ {
+ uint32_t value= hashkit_digest(&ptr->distribution_hashkit, sort_host, (size_t)sort_host_length);
+ ptr->ketama.continuum[continuum_index].index= host_index;
+ ptr->ketama.continuum[continuum_index++].value= value;
+ }
+ }
+ }
+ else
+ {
+ for (uint32_t pointer_index= 1;
+ pointer_index <= pointer_per_server / pointer_per_hash;
+ pointer_index++)
+ {
+ char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
+ int sort_host_length;
+
+ if (list[host_index].port == MEMCACHED_DEFAULT_PORT)
+ {
+ sort_host_length= snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "%s-%u",
+ list[host_index].hostname,
+ pointer_index - 1);
+ }
+ else
+ {
+ sort_host_length= snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH,
+ "%s:%u-%u",
+ list[host_index].hostname,
+ (uint32_t)list[host_index].port,
+ pointer_index - 1);
+ }
+
+ if (sort_host_length >= MEMCACHED_MAX_HOST_SORT_LENGTH || sort_host_length < 0)
+ {
+ return MEMCACHED_FAILURE;
+ }
+
+ WATCHPOINT_ASSERT(sort_host_length);
+
+ if (is_ketama_weighted)
+ {
+ for (uint32_t x = 0; x < pointer_per_hash; x++)
+ {
++ uint32_t value= ketama_server_hash(sort_host, (size_t)sort_host_length, x);
++ ptr->ketama.continuum[continuum_index].index= host_index;
++ ptr->ketama.continuum[continuum_index++].value= value;
+ }
+ }
+ else
+ {
+ uint32_t value= hashkit_digest(&ptr->distribution_hashkit, sort_host, (size_t)sort_host_length);
+ ptr->ketama.continuum[continuum_index].index= host_index;
+ ptr->ketama.continuum[continuum_index++].value= value;
+ }
+ }
+ }
+
+ pointer_counter+= pointer_per_server;
+ }
+
+ WATCHPOINT_ASSERT(ptr);
+ WATCHPOINT_ASSERT(ptr->continuum);
+ WATCHPOINT_ASSERT(memcached_server_count(ptr) * MEMCACHED_POINTS_PER_SERVER <= MEMCACHED_CONTINUUM_SIZE);
+ ptr->ketama.continuum_points_counter= pointer_counter;
+ qsort(ptr->ketama.continuum, ptr->ketama.continuum_points_counter, sizeof(memcached_continuum_item_st), continuum_item_cmp);
+
+ #ifdef DEBUG
+ for (uint32_t pointer_index= 0; memcached_server_count(ptr) && pointer_index < ((live_servers * MEMCACHED_POINTS_PER_SERVER) - 1); pointer_index++)
+ {
+ WATCHPOINT_ASSERT(ptr->continuum[pointer_index].value <= ptr->continuum[pointer_index + 1].value);
+ }
+ #endif
+
+ return MEMCACHED_SUCCESS;
+ }
+
+
+ memcached_return_t memcached_server_push(memcached_st *ptr, const memcached_server_list_st list)
+ {
+ if (not list)
+ return MEMCACHED_SUCCESS;
+
+ uint32_t count= memcached_server_list_count(list);
+
+ memcached_server_st *new_host_list;
+ new_host_list= static_cast<memcached_server_st*>(libmemcached_realloc(ptr, memcached_server_list(ptr),
+ sizeof(memcached_server_st) * (count + memcached_server_count(ptr))));
+
+ if (not new_host_list)
+ return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+
+ memcached_server_list_set(ptr, new_host_list);
+
+ for (uint32_t x= 0; x < count; x++)
+ {
+ memcached_server_write_instance_st instance;
+
+ if ((ptr->flags.use_udp && list[x].type != MEMCACHED_CONNECTION_UDP)
+ || ((list[x].type == MEMCACHED_CONNECTION_UDP)
+ && ! (ptr->flags.use_udp)) )
+ {
+ return MEMCACHED_INVALID_HOST_PROTOCOL;
+ }
+
+ WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
+
+ instance= memcached_server_instance_fetch(ptr, memcached_server_count(ptr));
+ WATCHPOINT_ASSERT(instance);
+
+ /* TODO check return type */
+ instance= memcached_server_create_with(ptr, instance, list[x].hostname,
+ list[x].port, list[x].weight, list[x].type);
+ if (! instance)
+ {
+ return memcached_set_error(ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, NULL);
+ }
+ ptr->number_of_hosts++;
+ }
+
+ // Provides backwards compatibility with server list.
+ {
+ memcached_server_write_instance_st instance;
+ instance= memcached_server_instance_fetch(ptr, 0);
+ instance->number_of_hosts= memcached_server_count(ptr);
+ }
+
+ return run_distribution(ptr);
+ }
+
+ memcached_return_t memcached_server_add_unix_socket(memcached_st *ptr,
+ const char *filename)
+ {
+ return memcached_server_add_unix_socket_with_weight(ptr, filename, 0);
+ }
+
+ memcached_return_t memcached_server_add_unix_socket_with_weight(memcached_st *ptr,
+ const char *filename,
+ uint32_t weight)
+ {
+ if (! filename)
+ return MEMCACHED_FAILURE;
+
+ return server_add(ptr, filename, 0, weight, MEMCACHED_CONNECTION_UNIX_SOCKET);
+ }
+
+ memcached_return_t memcached_server_add_udp(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port)
+ {
+ return memcached_server_add_udp_with_weight(ptr, hostname, port, 0);
+ }
+
+ memcached_return_t memcached_server_add_udp_with_weight(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port,
+ uint32_t weight)
+ {
+ if (! port)
+ port= MEMCACHED_DEFAULT_PORT;
+
+ if (! hostname)
+ hostname= "localhost";
+
+ return server_add(ptr, hostname, port, weight, MEMCACHED_CONNECTION_UDP);
+ }
+
+ memcached_return_t memcached_server_add(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port)
+ {
+ return memcached_server_add_with_weight(ptr, hostname, port, 0);
+ }
+
+ memcached_return_t memcached_server_add_with_weight(memcached_st *ptr,
+ const char *hostname,
+ in_port_t port,
+ uint32_t weight)
+ {
+ if (! port)
+ port= MEMCACHED_DEFAULT_PORT;
+
+ if (! hostname)
+ hostname= "localhost";
+
+ return server_add(ptr, hostname, port, weight, MEMCACHED_CONNECTION_TCP);
+ }
+
+ static memcached_return_t server_add(memcached_st *ptr, const char *hostname,
+ in_port_t port,
+ uint32_t weight,
+ memcached_connection_t type)
+ {
+ memcached_server_st *new_host_list;
+ memcached_server_write_instance_st instance;
+
+ if ( (ptr->flags.use_udp && type != MEMCACHED_CONNECTION_UDP)
+ || ( (type == MEMCACHED_CONNECTION_UDP) && (! ptr->flags.use_udp) ) )
+ return MEMCACHED_INVALID_HOST_PROTOCOL;
+
+ new_host_list= static_cast<memcached_server_st*>(libmemcached_realloc(ptr, memcached_server_list(ptr),
+ sizeof(memcached_server_st) * (ptr->number_of_hosts + 1)));
+
+ if (new_host_list == NULL)
+ return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+
+ memcached_server_list_set(ptr, new_host_list);
+
+ /* TODO: Check return type */
+ instance= memcached_server_instance_fetch(ptr, memcached_server_count(ptr));
+ (void)memcached_server_create_with(ptr, instance, hostname, port, weight, type);
+ ptr->number_of_hosts++;
+
+ instance= memcached_server_instance_fetch(ptr, 0);
+ memcached_servers_set_count(instance, memcached_server_count(ptr));
+
+ return run_distribution(ptr);
+ }
++
++memcached_return_t memcached_server_add_parsed(memcached_st *ptr,
++ const char *hostname,
++ size_t hostname_length,
++ in_port_t port,
++ uint32_t weight)
++{
++ char buffer[NI_MAXHOST];
++
++ memcpy(buffer, hostname, hostname_length);
++ buffer[hostname_length]= 0;
++
++ return server_add(ptr, buffer,
++ port,
++ weight,
++ MEMCACHED_CONNECTION_TCP);
++}
projects / m6w6 / libmemcached / commitdiff
