uint32_t *flags,
memcached_return *error)
{
- char *value;
- size_t dummy_length;
- uint32_t dummy_flags;
- memcached_return dummy_error;
-
- /* Request the key */
- *error= memcached_mget_by_key(ptr,
- master_key,
- master_key_length,
- &key, &key_length, 1);
-
- value= memcached_fetch(ptr, NULL, NULL,
- value_length, flags, error);
- /* This is for historical reasons */
- if (*error == MEMCACHED_END)
- *error= MEMCACHED_NOTFOUND;
-
- if (value == NULL)
- return NULL;
-
- (void)memcached_fetch(ptr, NULL, NULL,
- &dummy_length, &dummy_flags,
- &dummy_error);
-
- return value;
-}
-
-memcached_return memcached_mget(memcached_st *ptr,
- char **keys, size_t *key_length,
- unsigned int number_of_keys)
-{
- return memcached_mget_by_key(ptr, NULL, 0, keys, key_length, number_of_keys);
-}
-
-memcached_return memcached_mget_by_key(memcached_st *ptr,
- char *master_key, size_t master_key_length,
- char **keys, size_t *key_length,
- unsigned int number_of_keys)
-{
- unsigned int x;
- memcached_return rc= MEMCACHED_NOTFOUND;
- char *get_command= "get ";
- uint8_t get_command_length= 4;
- unsigned int master_server_key= 0;
-
- LIBMEMCACHED_MEMCACHED_MGET_START();
- ptr->cursor_server= 0;
-
- if (number_of_keys == 0)
- return MEMCACHED_NOTFOUND;
+ unsigned int server_key;
+ size_t send_length;
+ char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
+ memcached_result_st *result_buffer= &ptr->result;
+ memcached_return rc[MEMCACHED_MAX_REPLICAS];
+ uint8_t replicas= 0;
if (ptr->number_of_hosts == 0)
- return MEMCACHED_NO_SERVERS;
+ {
+ *error= MEMCACHED_NO_SERVERS;
+ return NULL;
+ }
- if (ptr->flags & MEM_SUPPORT_CAS)
+ if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test(&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
{
- get_command= "gets ";
- get_command_length= 5;
+ *value_length= 0;
+ *error= MEMCACHED_BAD_KEY_PROVIDED;
+ return NULL;
}
- if (master_key && master_key_length)
- master_server_key= memcached_generate_hash(ptr, master_key, master_key_length);
+ if (master_key)
+ server_key= memcached_generate_hash(ptr, master_key, master_key_length);
+ else
+ server_key= memcached_generate_hash(ptr, key, key_length);
- /*
- Here is where we pay for the non-block API. We need to remove any data sitting
- in the queue before we start our get.
+ send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
+ "get %.*s\r\n", (int)key_length, key);
- It might be optimum to bounce the connection if count > some number.
- */
- for (x= 0; x < ptr->number_of_hosts; x++)
+ do
{
- if (memcached_server_response_count(&ptr->hosts[x]))
- {
- char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
+ char response_buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
+ if (memcached_server_response_count(&ptr->hosts[server_key]))
+ {
if (ptr->flags & MEM_NO_BLOCK)
- (void)memcached_io_write(&ptr->hosts[x], NULL, 0, 1);
+ (void)memcached_io_write(&ptr->hosts[server_key], NULL, 0, 1);
- while(memcached_server_response_count(&ptr->hosts[x]))
- (void)memcached_response(&ptr->hosts[x], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, &ptr->result);
+ while(memcached_server_response_count(&ptr->hosts[server_key]))
+ (void)memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
}
- }
- /*
- If a server fails we warn about errors and start all over with sending keys
- to the server.
- */
- for (x= 0; x < number_of_keys; x++)
- {
- unsigned int server_key;
+ rc[replicas]= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
+ if (rc[replicas] != MEMCACHED_SUCCESS)
+ goto error;
- if (master_server_key)
- server_key= master_server_key;
- else
- server_key= memcached_generate_hash(ptr, keys[x], key_length[x]);
+ rc[replicas]= memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
- if (memcached_server_response_count(&ptr->hosts[server_key]) == 0)
- {
- rc= memcached_connect(&ptr->hosts[server_key]);
-
- if (rc != MEMCACHED_SUCCESS)
- continue;
-
- if ((memcached_io_write(&ptr->hosts[server_key], get_command, get_command_length, 0)) == -1)
- {
- rc= MEMCACHED_SOME_ERRORS;
- continue;
- }
- WATCHPOINT_ASSERT(ptr->hosts[server_key].cursor_active == 0);
- memcached_server_response_increment(&ptr->hosts[server_key]);
- WATCHPOINT_ASSERT(ptr->hosts[server_key].cursor_active == 1);
- }
-
- if ((memcached_io_write(&ptr->hosts[server_key], keys[x], key_length[x], 0)) == -1)
+ /* On no key found, we check the replica */
+ if (rc[replicas] == MEMCACHED_END) /* END means that we move on to the next */
{
memcached_server_response_reset(&ptr->hosts[server_key]);
- rc= MEMCACHED_SOME_ERRORS;
- continue;
}
-
- if ((memcached_io_write(&ptr->hosts[server_key], " ", 1, 0)) == -1)
+ else if (rc[replicas] == MEMCACHED_SUCCESS)
{
- memcached_server_response_reset(&ptr->hosts[server_key]);
- rc= MEMCACHED_SOME_ERRORS;
- continue;
+ *value_length= memcached_string_length(&result_buffer->value);
+
+ if (result_buffer->flags)
+ *flags= result_buffer->flags;
+
+ *error= MEMCACHED_SUCCESS;
+ return memcached_string_c_copy(&result_buffer->value);
}
- }
- /*
- Should we muddle on if some servers are dead?
- */
- for (x= 0; x < ptr->number_of_hosts; x++)
- {
- if (memcached_server_response_count(&ptr->hosts[x]))
+ /* On error we just jump to the next potential server */
+error:
+ if (ptr->number_of_replicas > 1)
{
- /* We need to do something about non-connnected hosts in the future */
- if ((memcached_io_write(&ptr->hosts[x], "\r\n", 2, 1)) == -1)
- {
- rc= MEMCACHED_SOME_ERRORS;
- }
+ if (server_key == (ptr->number_of_hosts - 1))
+ server_key= 0;
+ else
+ server_key++;
}
- }
+ } while ((++replicas) < ptr->number_of_replicas);
+
+ /* TODO: An error on replica 1 of host down, but not found on 2, will give wrong error */
+ /* This is for historical reasons */
+ if (rc[0] == MEMCACHED_END)
+ *error= MEMCACHED_NOTFOUND;
+ else
+ *error= rc[0];
+
+ *value_length= 0;
- LIBMEMCACHED_MEMCACHED_MGET_END();
- return rc;
+ return NULL;
}
projects / awesomized / libmemcached / blobdiff