X-Git-Url: https://git.m6w6.name/?a=blobdiff_plain;f=lib%2Fmemcached_hosts.c;h=de006dd6794b6b5125583e24dfa2bd10e5786d78;hb=8a86b578acc594d37a8638e3e0afba1286c4b6ca;hp=d5ec56064534af7b1ff02de9797138eb59b3015a;hpb=46f12a5edfa0fc0382a9d25355b15d30f857b138;p=m6w6%2Flibmemcached

diff --git a/lib/memcached_hosts.c b/lib/memcached_hosts.c
index d5ec5606..de006dd6 100644
--- a/lib/memcached_hosts.c
+++ b/lib/memcached_hosts.c
@@ -6,50 +6,119 @@ static memcached_return server_add(memcached_st *ptr, char *hostname,
                                    unsigned int port,
                                    memcached_connection type);
 
-static void host_reset(memcached_server_st *host, char *new_hostname, unsigned int port,
+#define MEMCACHED_WHEEL_SIZE 1024
+#define MEMCACHED_STRIDE 4
+static void rebalance_wheel(memcached_st *ptr)
+{
+  unsigned int x;
+  unsigned int y;
+  unsigned int latch;
+
+  /* Seed the Wheel */
+  memset(ptr->wheel, 0, sizeof(unsigned int) * MEMCACHED_WHEEL_SIZE);
+
+  for (latch= y= x= 0; x < MEMCACHED_WHEEL_SIZE; x++, latch++)
+  {
+    if (latch == MEMCACHED_STRIDE)
+    {
+      y++;
+      if (y == ptr->number_of_hosts)
+        y= 0;
+      latch= 0;
+    }
+
+    ptr->wheel[x]= y;
+  }
+}
+
+static int compare_servers(const void *p1, const void *p2)
+{
+  int return_value;
+  memcached_server_st *a= (memcached_server_st *)p1;
+  memcached_server_st *b= (memcached_server_st *)p2;
+
+  return_value= strcmp(a->hostname, b->hostname);
+
+  if (return_value == 0)
+  {
+    if (a->port > b->port)
+      return_value++;
+    else
+      return_value--;
+  }
+
+  return return_value;
+}
+
+static void host_reset(memcached_st *ptr, memcached_server_st *host, 
+                       char *hostname, unsigned int port,
                        memcached_connection type)
 {
   memset(host,  0, sizeof(memcached_server_st));
-  host->hostname= new_hostname;
+  strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
+  host->root= ptr ? ptr : NULL;
   host->port= port;
   host->fd= -1;
   host->type= type;
   host->read_ptr= host->read_buffer;
-  host->write_ptr= host->write_buffer;
+  host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
+}
+
+void server_list_free(memcached_st *ptr, memcached_server_st *servers)
+{
+  unsigned int x;
+
+  if (servers == NULL)
+    return;
+
+  for (x= 0; x < servers->count; x++)
+    if (servers[x].address_info)
+      freeaddrinfo(servers[x].address_info);
+
+  if (ptr && ptr->call_free)
+    ptr->call_free(ptr, servers);
+  else
+    free(servers);
 }
 
 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
 {
   unsigned int x;
-  unsigned int count;
+  uint16_t count;
   memcached_server_st *new_host_list;
 
   if (!list)
     return MEMCACHED_SUCCESS;
 
-  for (count= 0; list[count].hostname; count++);
+  count= list[0].count;
 
-  new_host_list= 
-    (memcached_server_st *)realloc(ptr->hosts, 
-                                   sizeof(memcached_server_st) * (count + ptr->number_of_hosts + 1));
+  if (ptr->call_realloc)
+    new_host_list= 
+      (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts, 
+                                               sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
+  else
+    new_host_list= 
+      (memcached_server_st *)realloc(ptr->hosts, 
+                                     sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 
   if (!new_host_list)
     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 
   ptr->hosts= new_host_list;
                                    
-  for (x= 0; list[x].hostname; x++)
+  for (x= 0; x < count; x++)
   {
-    ptr->hosts[ptr->number_of_hosts].hostname= strdup(list[x].hostname);
-    ptr->hosts[ptr->number_of_hosts].port= list[x].port;
-    ptr->hosts[ptr->number_of_hosts].fd= list[x].fd;
-    ptr->hosts[ptr->number_of_hosts].stack_responses= list[x].stack_responses;
-    ptr->hosts[ptr->number_of_hosts].cursor_active= list[x].cursor_active;
-    ptr->hosts[ptr->number_of_hosts].type= list[x].type;
+    WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
+    host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname, 
+               list[x].port, list[x].type);
     ptr->number_of_hosts++;
   }
-  host_reset(&ptr->hosts[ptr->number_of_hosts], NULL, 0,
-             MEMCACHED_CONNECTION_UNKNOWN);
+  ptr->hosts[0].count= ptr->number_of_hosts;
+
+  if (ptr->number_of_hosts > 1)
+    qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
+
+  rebalance_wheel(ptr);
 
   return MEMCACHED_SUCCESS;
 }
@@ -93,40 +162,28 @@ static memcached_return server_add(memcached_st *ptr, char *hostname,
                                    memcached_connection type)
 {
   memcached_server_st *new_host_list;
-  char *new_hostname;
   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 
 
-  if (ptr->number_of_hosts)
-  {
+  if (ptr->call_realloc)
+    new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts, 
+                                                            sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
+  else
     new_host_list= (memcached_server_st *)realloc(ptr->hosts, 
                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
-    if (!new_host_list)
-      return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
-    host_reset(&new_host_list[ptr->number_of_hosts], NULL, 0, 
-               MEMCACHED_CONNECTION_UNKNOWN);
-  }
-  else
-  {
-    new_host_list= 
-      (memcached_server_st *)malloc(sizeof(memcached_server_st) * 2);
-    if (!new_host_list)
-      return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
-    host_reset(&new_host_list[0], NULL, 0, MEMCACHED_CONNECTION_UNKNOWN);
-    host_reset(&new_host_list[1], NULL, 0, MEMCACHED_CONNECTION_UNKNOWN);
-  }
+  if (new_host_list == NULL)
+    return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 
   ptr->hosts= new_host_list;
 
-  new_hostname=
-    (char *)malloc(sizeof(char) * (strlen(hostname)+1));
+  host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
+  ptr->number_of_hosts++;
+  ptr->hosts[0].count++;
 
-  if (!new_hostname)
-    return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+  if (ptr->number_of_hosts > 1)
+    qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
 
-  memcpy(new_hostname, hostname, strlen(hostname));
-  host_reset(&ptr->hosts[ptr->number_of_hosts], new_hostname, port, type);
-  ptr->number_of_hosts++;
+  rebalance_wheel(ptr);
 
   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 
@@ -139,64 +196,53 @@ memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 {
   unsigned int count;
   memcached_server_st *new_host_list;
-  char *new_hostname;
 
-  if (!hostname)
-    return ptr;
+  if (hostname == NULL || error == NULL)
+    return NULL;
 
   if (!port)
     port= MEMCACHED_DEFAULT_PORT; 
 
-  /* Always count so that we keep a free host at the end */
-  if (ptr)
+  /* Increment count for hosts */
+  count= 1;
+  if (ptr != NULL)
   {
-    for (count= 0; ptr[count].hostname; count++);
-    count+= 2;
-    new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
-    if (!new_host_list)
-      goto error;
-    host_reset(&new_host_list[count-1], NULL, 0, MEMCACHED_CONNECTION_UNKNOWN);
-  }
-  else
+    count+= ptr[0].count;
+  } 
+
+  new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
+  if (!new_host_list)
   {
-    count= 2;
-    new_host_list= (memcached_server_st *)malloc(sizeof(memcached_server_st) * count);
-    if (!new_host_list)
-      goto error;
-    host_reset(&new_host_list[0], NULL, 0, MEMCACHED_CONNECTION_UNKNOWN);
-    host_reset(&new_host_list[1], NULL, 0, MEMCACHED_CONNECTION_UNKNOWN);
+    *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+    return NULL;
   }
 
-  new_hostname= strdup(hostname);
+  host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
+
+  /* Backwards compatibility hack */
+  new_host_list[0].count++;
+
+  count= new_host_list[0].count;
 
-  if (!new_hostname)
-    goto error;
+  if (new_host_list[0].count > 1)
+    qsort(new_host_list, count, sizeof(memcached_server_st), compare_servers);
+
+  new_host_list[0].count= count;
 
-  host_reset(&new_host_list[count-2], new_hostname, port, MEMCACHED_CONNECTION_TCP);
 
   *error= MEMCACHED_SUCCESS;
   return new_host_list;
-error:
-  *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
-
-  return NULL;
 }
 
 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 {
-  unsigned int x;
+  if (ptr == NULL)
+    return 0;
 
-  for (x= 0; ptr[x].hostname; x++);
-  
-  return x;
+  return ptr[0].count;
 }
 
 void memcached_server_list_free(memcached_server_st *ptr)
 {
-  unsigned int x;
-
-  for (x= 0; ptr[x].hostname; x++)
-    free(ptr[x].hostname);
-
-  free(ptr);
+  server_list_free(NULL, ptr);
 }