#include "common.h"
+
/* Defines */
-static uint64_t FNV_64_INIT= 0xcbf29ce484222325LL;
-static uint64_t FNV_64_PRIME= 0x100000001b3LL;
+static uint64_t FNV_64_INIT= UINT64_C(0xcbf29ce484222325);
+static uint64_t FNV_64_PRIME= UINT64_C(0x100000001b3);
static uint32_t FNV_32_INIT= 2166136261UL;
static uint32_t FNV_32_PRIME= 16777619;
/* Prototypes */
-static uint32_t internal_generate_hash(char *key, size_t key_length);
-static uint32_t internal_generate_md5(char *key, size_t key_length);
-static uint32_t internal_generate_ketama_md5(char *key, size_t key_length);
+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 generate_hash(memcached_st *ptr, char *key, size_t key_length)
+uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash hash_algorithm)
{
uint32_t hash= 1; /* Just here to remove compile warning */
uint32_t x= 0;
-
- WATCHPOINT_ASSERT(ptr->number_of_hosts);
-
- if (ptr->number_of_hosts == 1)
- return 0;
-
- switch (ptr->hash)
+ switch (hash_algorithm)
{
case MEMCACHED_HASH_DEFAULT:
hash= internal_generate_hash(key, key_length);
for (x= 0; x < key_length; x++)
{
temp_hash *= FNV_64_PRIME;
- temp_hash ^= key[x];
+ temp_hash ^= (uint64_t)key[x];
}
hash= (uint32_t)temp_hash;
}
break;
case MEMCACHED_HASH_FNV1A_64:
{
- hash= FNV_64_INIT;
+ hash= (uint32_t) FNV_64_INIT;
for (x= 0; x < key_length; x++)
{
- hash ^= key[x];
- hash *= FNV_64_PRIME;
+ uint32_t val= (uint32_t)key[x];
+ hash ^= val;
+ hash *= (uint32_t) FNV_64_PRIME;
}
}
break;
hash= FNV_32_INIT;
for (x= 0; x < key_length; x++)
{
+ uint32_t val= (uint32_t)key[x];
hash *= FNV_32_PRIME;
- hash ^= key[x];
+ hash ^= val;
}
}
break;
hash= FNV_32_INIT;
for (x= 0; x < key_length; x++)
{
- hash ^= key[x];
+ uint32_t val= (uint32_t)key[x];
+ hash ^= val;
hash *= FNV_32_PRIME;
}
}
break;
- case MEMCACHED_HASH_KETAMA:
- {
- hash= internal_generate_ketama_md5(key, key_length);
- 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;
+ }
+ default:
+ {
+ WATCHPOINT_ASSERT(hash_algorithm);
+ break;
+ }
}
+ return hash;
+}
+
+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);
+ if (ptr->number_of_hosts == 1)
+ return 0;
+
+ hash= memcached_generate_hash_value(key, key_length, ptr->hash);
WATCHPOINT_ASSERT(hash);
return hash;
}
-unsigned int dispatch_host(memcached_st *ptr, uint32_t hash)
+static uint32_t dispatch_host(memcached_st *ptr, uint32_t hash)
{
switch (ptr->distribution)
{
case MEMCACHED_DISTRIBUTION_CONSISTENT:
case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
{
- int num= ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER;
+ uint32_t num= ptr->continuum_points_counter;
+ WATCHPOINT_ASSERT(ptr->continuum);
hash= hash;
- struct continuum_item *begin, *end, *left, *right, *middle;
+ memcached_continuum_item_st *begin, *end, *left, *right, *middle;
begin= left= ptr->continuum;
- end= right= ptr->continuum + (num - 1);
+ end= right= ptr->continuum + num;
- while (1)
+ while (left < right)
{
- struct continuum_item *rmiddle;
-
- middle = left + (right - left) / 2;
-
- if (middle==end)
- return begin->index;
-
- if (middle==begin)
- return end->index;
-
- rmiddle = middle+1;
-
- if (hash<rmiddle->value && hash>=middle->value)
- return middle->index;
-
+ middle= left + (right - left) / 2;
if (middle->value < hash)
- left = middle + 1;
- else if (middle->value > hash)
- right = middle - 1;
-
- if (left>right)
- return left->index;
+ left= middle + 1;
+ else
+ right= middle;
}
+ if (right == end)
+ right= begin;
+ return right->index;
}
- break;
- case MEMCACHED_DISTRIBUTION_CONSISTENT_WHEEL:
- {
- unsigned int server_key;
-
- server_key= hash % MEMCACHED_WHEEL_SIZE;
-
- return ptr->wheel[server_key];
- }
case MEMCACHED_DISTRIBUTION_MODULA:
return hash % ptr->number_of_hosts;
+ case MEMCACHED_DISTRIBUTION_RANDOM:
+ return (uint32_t) random() % ptr->number_of_hosts;
default:
WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
return hash % ptr->number_of_hosts;
}
- if (ptr->distribution == MEMCACHED_DISTRIBUTION_MODULA)
- {
- return hash % ptr->number_of_hosts;
- }
- else if (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT)
- {
- unsigned int server_key;
-
- server_key= hash % MEMCACHED_WHEEL_SIZE;
-
- return ptr->wheel[server_key];
- }
- else if (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA)
- {
- int num = ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER;
-
- hash = hash;
- struct continuum_item *begin, *end, *left, *right, *middle;
- begin = left = ptr->continuum;
- end = right = ptr->continuum + (num - 1);
- while(1)
- {
- middle = left + (right - left) / 2;
- if(middle==end)
- {
- return begin->index;
- }
- if(middle==begin)
- {
- return end->index;
- }
- struct continuum_item *rmiddle = middle+1;
- if(hash<rmiddle->value && hash>=middle->value)
- return middle->index;
-
- if(middle->value < hash) {
- left = middle + 1;
- }else if(middle->value > hash) {
- right = middle - 1;
- }
-
- if (left>right)
- return left->index;
- }
- }
- else
- {
- WATCHPOINT_ASSERT(0);
- }
+ /* NOTREACHED */
}
-unsigned int memcached_generate_hash(memcached_st *ptr, char *key, size_t key_length)
+/*
+ One day make this public, and have it return the actual memcached_server_st
+ to the calling application.
+*/
+uint32_t memcached_generate_hash(memcached_st *ptr, const char *key, size_t key_length)
{
uint32_t hash= 1; /* Just here to remove compile warning */
if (ptr->number_of_hosts == 1)
return 0;
- hash = generate_hash(ptr, key, key_length);
+ if (ptr->flags & MEM_HASH_WITH_PREFIX_KEY)
+ {
+ size_t temp_length= ptr->prefix_key_length + key_length;
+ char temp[temp_length];
+
+ if (temp_length > MEMCACHED_MAX_KEY -1)
+ return 0;
+
+ strncpy(temp, ptr->prefix_key, ptr->prefix_key_length);
+ strncpy(temp + ptr->prefix_key_length, key, key_length);
+ hash= generate_hash(ptr, temp, temp_length);
+ }
+ else
+ {
+ 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;
+
+ if (gettimeofday(&now, NULL) == 0 &&
+ now.tv_sec > ptr->next_distribution_rebuild)
+ run_distribution(ptr);
+ }
+
return dispatch_host(ptr, hash);
}
-static uint32_t internal_generate_hash(char *key, size_t key_length)
+static uint32_t internal_generate_hash(const char *key, size_t key_length)
{
- char *ptr= key;
+ const char *ptr= key;
uint32_t value= 0;
- while (--key_length)
+ while (key_length--)
{
- value += *ptr++;
+ uint32_t val= (uint32_t) *ptr++;
+ value += val;
value += (value << 10);
value ^= (value >> 6);
}
value ^= (value >> 11);
value += (value << 15);
- return value == 0 ? 1 : value;
-}
-
-static uint32_t internal_generate_md5(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] << 24 )
- | ( results[2] << 16 )
- | ( results[1] << 8 )
- | results[0] );
+ return value == 0 ? 1 : (uint32_t) value;
}
-static uint32_t internal_generate_ketama_md5(char *key, size_t key_length)
+static uint32_t internal_generate_md5(const char *key, size_t key_length)
{
unsigned char results[16];
projects / m6w6 / libmemcached / blobdiff