From:  <brian@gir.tangent.org>
Date: Mon, 21 Apr 2008 23:10:50 +0000 (-0700)
Subject: Committing change to dynamic numbers of servers (need to pull this to a linux
X-Git-Tag: _20~1^2~12
X-Git-Url: https://git.m6w6.name/?a=commitdiff_plain;h=002a16ba3cd4638664880a644d73ddf3dc3b2b6b;p=m6w6%2Flibmemcached

Committing change to dynamic numbers of servers (need to pull this to a linux
box for testing)
---

diff --git a/libmemcached/common.h b/libmemcached/common.h
index 44e32dd8..50ee60bf 100644
--- a/libmemcached/common.h
+++ b/libmemcached/common.h
@@ -108,7 +108,7 @@ void server_list_free(memcached_st *ptr, memcached_server_st *servers);
 memcached_return memcachd_key_test(char **keys, size_t *key_length,
                                    unsigned int number_of_keys);
 
-void sort_hosts(memcached_st *ptr);
+memcached_return run_distribution(memcached_st *ptr);
 
 uint32_t generate_hash(memcached_st *ptr, char *key, size_t key_length);
 #endif /* __COMMON_H__ */
diff --git a/libmemcached/memcached.c b/libmemcached/memcached.c
index 33a80bab..353d135f 100644
--- a/libmemcached/memcached.c
+++ b/libmemcached/memcached.c
@@ -105,6 +105,14 @@ memcached_st *memcached_clone(memcached_st *clone, memcached_st *ptr)
   new_clone->get_key_failure= ptr->get_key_failure;
   new_clone->delete_trigger= ptr->delete_trigger;
 
+  rc= run_distribution(new_clone);
+  if (rc != MEMCACHED_SUCCESS)
+  {
+    memcached_free(new_clone);
+
+    return NULL;
+  }
+
   if (ptr->on_clone)
     ptr->on_clone(ptr, new_clone);
 
diff --git a/libmemcached/memcached.h b/libmemcached/memcached.h
index cac25a89..45d4085f 100644
--- a/libmemcached/memcached.h
+++ b/libmemcached/memcached.h
@@ -31,10 +31,11 @@ extern "C" {
 #define MEMCACHED_VERSION_STRING_LENGTH 12
 
 /* string value */
-struct continuum_item{
-	uint32_t index;
-	uint32_t value;
+struct memcached_continuum_item_st {
+  uint32_t index;
+  uint32_t value;
 };
+
 #define LIBMEMCACHED_VERSION_STRING "0.20"
 
 struct memcached_stat_st {
@@ -81,7 +82,8 @@ struct memcached_st {
   memcached_server_distribution distribution;
   void *user_data;
   unsigned int wheel[MEMCACHED_WHEEL_SIZE];
-  struct continuum_item continuum[MEMCACHED_CONTINUUM_SIZE];
+  uint32_t continuum_count;
+  memcached_continuum_item_st *continuum;
   memcached_clone_func on_clone;
   memcached_cleanup_func on_cleanup;
   memcached_free_function call_free;
diff --git a/libmemcached/memcached_behavior.c b/libmemcached/memcached_behavior.c
index 1de8f495..287f8f0c 100644
--- a/libmemcached/memcached_behavior.c
+++ b/libmemcached/memcached_behavior.c
@@ -60,7 +60,7 @@ memcached_return memcached_behavior_set(memcached_st *ptr,
       if (ptr->flags & MEM_USE_SORT_HOSTS)
       {
         memcached_quit(ptr);
-        sort_hosts(ptr);
+        run_distribution(ptr);
       }
 
       break;
diff --git a/libmemcached/memcached_constants.h b/libmemcached/memcached_constants.h
index 237ff54d..e60a03b7 100644
--- a/libmemcached/memcached_constants.h
+++ b/libmemcached/memcached_constants.h
@@ -24,6 +24,7 @@ extern "C" {
 #define MEMCACHED_CONTINUUM_SIZE MEMCACHED_POINTS_PER_SERVER*100 /* This would then set max hosts to 100 */ 
 #define MEMCACHED_STRIDE 4
 #define MEMCACHED_DEFAULT_TIMEOUT INT32_MAX
+#define MEMCACHED_CONTINUUM_ADDITION 10 /* How many extra slots we should build for in the continuum */
 
 typedef enum {
   MEMCACHED_SUCCESS,
diff --git a/libmemcached/memcached_get.c b/libmemcached/memcached_get.c
index 354f7bb8..852e90dd 100644
--- a/libmemcached/memcached_get.c
+++ b/libmemcached/memcached_get.c
@@ -39,7 +39,7 @@ char *memcached_get_by_key(memcached_st *ptr,
 
   if (value == NULL)
   {
-    if (ptr->get_key_failure)
+    if (ptr->get_key_failure && *error == MEMCACHED_NOTFOUND)
     {
       memcached_return rc;
 
diff --git a/libmemcached/memcached_hash.c b/libmemcached/memcached_hash.c
index 8d269faa..3294a0a6 100644
--- a/libmemcached/memcached_hash.c
+++ b/libmemcached/memcached_hash.c
@@ -112,13 +112,13 @@ unsigned int dispatch_host(memcached_st *ptr, uint32_t hash)
       int num= ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER;
 
       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);
 
       while (1)
       {
-        struct continuum_item *rmiddle;
+        memcached_continuum_item_st *rmiddle;
 
         middle = left + (right - left) / 2;
 
@@ -175,7 +175,7 @@ unsigned int dispatch_host(memcached_st *ptr, uint32_t hash)
     int num = ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER;
 
     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);
     while(1)
@@ -189,7 +189,7 @@ unsigned int dispatch_host(memcached_st *ptr, uint32_t hash)
       {
         return end->index;
       }
-      struct continuum_item *rmiddle = middle+1;
+      memcached_continuum_item_st *rmiddle = middle+1;
       if(hash<rmiddle->value && hash>=middle->value)
         return middle->index;
 
diff --git a/libmemcached/memcached_hosts.c b/libmemcached/memcached_hosts.c
index 79bcb99d..72de6d09 100644
--- a/libmemcached/memcached_hosts.c
+++ b/libmemcached/memcached_hosts.c
@@ -4,6 +4,7 @@
 static memcached_return server_add(memcached_st *ptr, char *hostname, 
                                    unsigned int port,
                                    memcached_connection type);
+memcached_return update_continuum(memcached_st *ptr);
 
 #define MEMCACHED_WHEEL_SIZE 1024
 #define MEMCACHED_STRIDE 4
@@ -55,6 +56,28 @@ void sort_hosts(memcached_st *ptr)
   }
 }
 
+
+memcached_return run_distribution(memcached_st *ptr)
+{
+  switch (ptr->distribution) 
+  {
+  case MEMCACHED_DISTRIBUTION_CONSISTENT:
+  case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
+    return update_continuum(ptr);
+  case MEMCACHED_DISTRIBUTION_CONSISTENT_WHEEL:
+    rebalance_wheel(ptr);
+    break;
+  case MEMCACHED_DISTRIBUTION_MODULA:
+    if (ptr->flags & MEM_USE_SORT_HOSTS)
+      sort_hosts(ptr);
+    break;
+  default:
+    WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
+  }
+
+  return MEMCACHED_SUCCESS;
+}
+
 static void host_reset(memcached_st *ptr, memcached_server_st *host, 
                        char *hostname, unsigned int port,
                        memcached_connection type)
@@ -90,8 +113,8 @@ void server_list_free(memcached_st *ptr, memcached_server_st *servers)
 
 static int continuum_item_cmp(const void *t1, const void *t2)
 {
-  struct continuum_item *ct1 = (struct continuum_item *)t1;
-  struct continuum_item *ct2 = (struct continuum_item *)t2;
+  memcached_continuum_item_st *ct1 = (memcached_continuum_item_st *)t1;
+  memcached_continuum_item_st *ct2 = (memcached_continuum_item_st *)t2;
 
   WATCHPOINT_ASSERT(ct1->value != 153);
   if (ct1->value == ct2->value)
@@ -114,14 +137,31 @@ static uint32_t internal_generate_ketama_md5(char *key, size_t key_length)
     | ( results[0] );
 }
 
-void update_continuum(memcached_st *ptr)
+memcached_return update_continuum(memcached_st *ptr)
 {
   uint32_t index;
   uint32_t host_index;
   uint32_t continuum_index= 0;
   uint32_t value;
-  memcached_server_st *list = ptr->hosts;
+  memcached_server_st *list;
+
+  if (ptr->number_of_hosts > ptr->continuum_count)
+  {
+    memcached_continuum_item_st *new_ptr;
+
+    if (ptr->call_realloc)
+      new_ptr= (memcached_continuum_item_st *)ptr->call_realloc(ptr, ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
+    else
+      new_ptr= (memcached_continuum_item_st *)realloc(ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
+
+    if (new_ptr == 0)
+      return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+
+    ptr->continuum= new_ptr;
+    ptr->continuum_count= ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION;
+  }
 
+  list = ptr->hosts;
   for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index) 
   {
     for(index= 1; index <= MEMCACHED_POINTS_PER_SERVER; ++index) 
@@ -139,13 +179,15 @@ void update_continuum(memcached_st *ptr)
   }
 
   WATCHPOINT_ASSERT(ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER <= MEMCACHED_CONTINUUM_SIZE);
-  qsort(ptr->continuum, ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER, sizeof(struct continuum_item), continuum_item_cmp);
+  qsort(ptr->continuum, ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER, sizeof(memcached_continuum_item_st), continuum_item_cmp);
 #ifdef HAVE_DEBUG
   for (index= 0; index < ((ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER) - 1); index++) 
   {
     WATCHPOINT_ASSERT(ptr->continuum[index].value <= ptr->continuum[index + 1].value);
   }
 #endif
+
+  return MEMCACHED_SUCCESS;
 }
 
 
@@ -183,25 +225,7 @@ memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *l
   }
   ptr->hosts[0].count= ptr->number_of_hosts;
 
-  if (ptr->flags & MEM_USE_SORT_HOSTS)
-    sort_hosts(ptr);
-
-  switch (ptr->distribution) 
-  {
-  case MEMCACHED_DISTRIBUTION_CONSISTENT:
-  case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
-    update_continuum(ptr);
-    break;
-  case MEMCACHED_DISTRIBUTION_CONSISTENT_WHEEL:
-    rebalance_wheel(ptr);
-    break;
-  case MEMCACHED_DISTRIBUTION_MODULA:
-    break;
-  default:
-    WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
-  }
-
-  return MEMCACHED_SUCCESS;
+  return run_distribution(ptr);
 }
 
 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
@@ -243,8 +267,6 @@ static memcached_return server_add(memcached_st *ptr, char *hostname,
                                    memcached_connection type)
 {
   memcached_server_st *new_host_list;
-  LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
-
 
   if (ptr->call_realloc)
     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts, 
@@ -259,30 +281,9 @@ static memcached_return server_add(memcached_st *ptr, char *hostname,
 
   host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
   ptr->number_of_hosts++;
-
-  if (ptr->flags & MEM_USE_SORT_HOSTS)
-    sort_hosts(ptr);
-
   ptr->hosts[0].count= ptr->number_of_hosts;
 
-  switch (ptr->distribution) 
-  {
-  case MEMCACHED_DISTRIBUTION_CONSISTENT:
-  case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
-    update_continuum(ptr);
-    break;
-  case MEMCACHED_DISTRIBUTION_CONSISTENT_WHEEL:
-    rebalance_wheel(ptr);
-    break;
-  case MEMCACHED_DISTRIBUTION_MODULA:
-    break;
-  default:
-    WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
-  }
-
-  LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
-
-  return MEMCACHED_SUCCESS;
+  return run_distribution(ptr);
 }
 
 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr, 
diff --git a/libmemcached/memcached_types.h b/libmemcached/memcached_types.h
index de0709ba..20837af9 100644
--- a/libmemcached/memcached_types.h
+++ b/libmemcached/memcached_types.h
@@ -18,6 +18,7 @@ typedef struct memcached_stat_st memcached_stat_st;
 typedef struct memcached_result_st memcached_result_st;
 typedef struct memcached_string_st memcached_string_st;
 typedef struct memcached_server_st memcached_server_st;
+typedef struct memcached_continuum_item_st memcached_continuum_item_st;
 typedef memcached_return (*memcached_clone_func)(memcached_st *parent, memcached_st *clone);
 typedef memcached_return (*memcached_cleanup_func)(memcached_st *ptr);
 typedef void (*memcached_free_function)(memcached_st *ptr, void *mem);