-#include <memcached.h>
+#include "common.h"
+#include "memcached_io.h"
+/*
+ What happens if no servers exist?
+*/
char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
size_t *value_length,
- uint16_t *flags,
+ uint32_t *flags,
memcached_return *error)
{
- size_t send_length, sent_length;
- char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- char *string_ptr;
- unsigned int server_key;
-
- *value_length= 0;
- *error= memcached_connect(ptr);
-
- if (*error != MEMCACHED_SUCCESS)
- return NULL;
-
- server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
+ return memcached_get_by_key(ptr, NULL, 0, key, key_length, value_length,
+ flags, error);
+}
- send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
- (int)key_length, key);
+char *memcached_get_by_key(memcached_st *ptr,
+ char *master_key, size_t master_key_length,
+ char *key, size_t key_length,
+ size_t *value_length,
+ uint32_t *flags,
+ memcached_return *error)
+{
+ 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 (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
+ if (ptr->number_of_hosts == 0)
{
- *error= MEMCACHED_WRITE_FAILURE;
+ *error= MEMCACHED_NO_SERVERS;
return NULL;
}
- sent_length= write(ptr->hosts[server_key].fd, buffer, send_length);
-
- if (sent_length == -1)
+ if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test(&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
{
- fprintf(stderr, "error %s: write: %m\n", __FUNCTION__);
- *error= MEMCACHED_WRITE_FAILURE;
+ *value_length= 0;
+ *error= MEMCACHED_BAD_KEY_PROVIDED;
return NULL;
}
- if (sent_length != send_length)
- {
- fprintf(stderr, "error %s: short write %d %d: %m\n",
- __FUNCTION__, sent_length, send_length);
- *error= MEMCACHED_WRITE_FAILURE;
- return NULL;
- }
+ if (master_key)
+ server_key= memcached_generate_hash(ptr, master_key, master_key_length);
+ else
+ server_key= memcached_generate_hash(ptr, key, key_length);
- memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
- *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
+ send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
+ "get %.*s\r\n", (int)key_length, key);
- if (*error == MEMCACHED_SUCCESS)
+ do
{
- char *end_ptr;
-
- string_ptr= buffer;
- string_ptr+= 6; /* "VALUE " */
+ char response_buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- /* We do nothing with the key, since we only asked for one key */
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
-
- /* Flags fetch */
- string_ptr= end_ptr + 1;
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
- *flags= (uint16_t)strtol(string_ptr, &end_ptr, 10);
-
- /* Length fetch */
- string_ptr= end_ptr + 1;
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
- *value_length= strtoll(string_ptr, &end_ptr, 10);
-
- /* Skip past the \r\n */
- string_ptr= end_ptr +2;
-
- if (*value_length)
+ if (memcached_server_response_count(&ptr->hosts[server_key]))
{
- size_t need_to_copy;
- char *pos_ptr;
- char *value;
+ if (ptr->flags & MEM_NO_BLOCK)
+ (void)memcached_io_write(&ptr->hosts[server_key], NULL, 0, 1);
- value= (char *)malloc(*value_length * sizeof(char));
-
- if (!value)
- {
- *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
- return NULL;
- }
+ while(memcached_server_response_count(&ptr->hosts[server_key]))
+ (void)memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
+ }
- need_to_copy= (*value_length < (size_t)(buffer-string_ptr))
- ? *value_length
- : (size_t)(buffer-string_ptr) ;
+ rc[replicas]= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
+ if (rc[replicas] != MEMCACHED_SUCCESS)
+ goto error;
- pos_ptr= memcpy(value, string_ptr, need_to_copy);
+ rc[replicas]= memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
- if ( need_to_copy > *value_length)
- {
- size_t read_length;
- size_t need_to_read;
+ /* 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]);
+ }
+ else if (rc[replicas] == MEMCACHED_SUCCESS)
+ {
+ *value_length= memcached_string_length(&result_buffer->value);
+
+ if (result_buffer->flags)
+ *flags= result_buffer->flags;
- need_to_read= *value_length - need_to_copy;
+ *error= MEMCACHED_SUCCESS;
+ return memcached_string_c_copy(&result_buffer->value);
+ }
- read_length= read(ptr->hosts[server_key].fd, pos_ptr, need_to_read);
- if (read_length != need_to_read)
- {
- free(value);
- *error= MEMCACHED_PARTIAL_READ;
+ /* On error we just jump to the next potential server */
+error:
+ if (ptr->number_of_replicas > 1)
+ {
+ if (server_key == (ptr->number_of_hosts - 1))
+ server_key= 0;
+ else
+ server_key++;
+ }
+ } while ((++replicas) < ptr->number_of_replicas);
- return NULL;
- }
- }
+ /* 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];
- return value;
- }
- }
+ *value_length= 0;
return NULL;
}
projects / awesomized / libmemcached / blobdiff