-#include "common.h"
-
-
-/* Defines */
-static uint64_t FNV_64_INIT= UINT64_C(0xcbf29ce484222325);
-static uint64_t FNV_64_PRIME= UINT64_C(0x100000001b3);
+/* 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:
+ *
+ */
-static uint32_t FNV_32_INIT= 2166136261UL;
-static uint32_t FNV_32_PRIME= 16777619;
+#include "common.h"
-/* Prototypes */
-static uint32_t internal_generate_hash(const char *key, size_t key_length);
-static uint32_t internal_generate_md5(const char *key, size_t key_length);
uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash_t hash_algorithm)
{
- uint32_t hash= 1; /* Just here to remove compile warning */
- uint32_t x= 0;
-
- switch (hash_algorithm)
- {
- case MEMCACHED_HASH_DEFAULT:
- hash= internal_generate_hash(key, key_length);
- break;
- case MEMCACHED_HASH_MD5:
- hash= internal_generate_md5(key, key_length);
- break;
- case MEMCACHED_HASH_CRC:
- hash= ((hash_crc32(key, key_length) >> 16) & 0x7fff);
- if (hash == 0)
- hash= 1;
- break;
- /* FNV hash'es lifted from Dustin Sallings work */
- case MEMCACHED_HASH_FNV1_64:
- {
- /* Thanks to pierre@demartines.com for the pointer */
- uint64_t temp_hash;
-
- temp_hash= FNV_64_INIT;
- for (x= 0; x < key_length; x++)
- {
- temp_hash *= FNV_64_PRIME;
- temp_hash ^= (uint64_t)key[x];
- }
- hash= (uint32_t)temp_hash;
- }
- break;
- case MEMCACHED_HASH_FNV1A_64:
- {
- hash= (uint32_t) FNV_64_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash ^= val;
- hash *= (uint32_t) FNV_64_PRIME;
- }
- }
- break;
- case MEMCACHED_HASH_FNV1_32:
- {
- hash= FNV_32_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash *= FNV_32_PRIME;
- hash ^= val;
- }
- }
- break;
- case MEMCACHED_HASH_FNV1A_32:
- {
- hash= FNV_32_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash ^= val;
- hash *= FNV_32_PRIME;
- }
- }
- break;
- case MEMCACHED_HASH_HSIEH:
- {
-#ifdef HAVE_HSIEH_HASH
- hash= hsieh_hash(key, key_length);
-#endif
- break;
- }
- case MEMCACHED_HASH_MURMUR:
- {
- hash= murmur_hash(key, key_length);
- break;
- }
- case MEMCACHED_HASH_JENKINS:
- {
- hash= jenkins_hash(key, key_length, 13);
- break;
- }
- case MEMCACHED_HASH_MAX:
- default:
- {
- WATCHPOINT_ASSERT(0);
- break;
- }
- }
-
- return hash;
+ return libhashkit_digest(key, key_length, (hashkit_hash_algorithm_t)hash_algorithm);
}
uint32_t generate_hash(memcached_st *ptr, const char *key, size_t key_length)
uint32_t hash= 1; /* Just here to remove compile warning */
- WATCHPOINT_ASSERT(ptr->number_of_hosts);
+ WATCHPOINT_ASSERT(memcached_server_count(ptr));
- if (ptr->number_of_hosts == 1)
+ if (memcached_server_count(ptr) == 1)
return 0;
- hash= memcached_generate_hash_value(key, key_length, ptr->hash);
- WATCHPOINT_ASSERT(hash);
+ hash= hashkit_digest(&ptr->hashkit, key, key_length);
+
return hash;
}
return right->index;
}
case MEMCACHED_DISTRIBUTION_MODULA:
- return hash % ptr->number_of_hosts;
+ return hash % memcached_server_count(ptr);
case MEMCACHED_DISTRIBUTION_RANDOM:
- return (uint32_t) random() % ptr->number_of_hosts;
+ return (uint32_t) random() % memcached_server_count(ptr);
case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX:
default:
WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
- return hash % ptr->number_of_hosts;
+ return hash % memcached_server_count(ptr);
}
/* NOTREACHED */
}
{
uint32_t hash= 1; /* Just here to remove compile warning */
- WATCHPOINT_ASSERT(ptr->number_of_hosts);
+ WATCHPOINT_ASSERT(memcached_server_count(ptr));
- if (ptr->number_of_hosts == 1)
+ if (memcached_server_count(ptr) == 1)
return 0;
if (ptr->flags.hash_with_prefix_key)
hash= generate_hash(ptr, key, key_length);
}
- WATCHPOINT_ASSERT(hash);
-
if (memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS) && ptr->next_distribution_rebuild)
{
struct timeval now;
return dispatch_host(ptr, hash);
}
-static uint32_t internal_generate_hash(const char *key, size_t key_length)
+hashkit_st *memcached_get_hashkit(memcached_st *ptr)
{
- const char *ptr= key;
- uint32_t value= 0;
-
- while (key_length--)
- {
- uint32_t val= (uint32_t) *ptr++;
- value += val;
- value += (value << 10);
- value ^= (value >> 6);
- }
- value += (value << 3);
- value ^= (value >> 11);
- value += (value << 15);
-
- return value == 0 ? 1 : (uint32_t) value;
-}
-
-static uint32_t internal_generate_md5(const char *key, size_t key_length)
-{
- unsigned char results[16];
-
- md5_signature((unsigned char*)key, (unsigned int)key_length, results);
-
- return ((uint32_t) (results[3] & 0xFF) << 24)
- | ((uint32_t) (results[2] & 0xFF) << 16)
- | ((uint32_t) (results[1] & 0xFF) << 8)
- | (results[0] & 0xFF);
+ return &ptr->hashkit;
}