-#include <memcached.h>
-
-static char *memcached_value_fetch(memcached_st *ptr, char *key, size_t *key_length,
- size_t *value_length,
- uint16_t *flags,
- memcached_return *error,
- char load_key,
- unsigned int server_key)
-{
- char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- char *string_ptr;
- char *end_ptr;
-
- assert(value_length);
- assert(flags);
- assert(error);
-
- end_ptr= buffer + MEMCACHED_DEFAULT_COMMAND_SIZE;
-
- *value_length= 0;
-
- memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
- *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
-
- if (*error == MEMCACHED_SUCCESS)
- {
- char *next_ptr;
-
- string_ptr= buffer;
- string_ptr+= 6; /* "VALUE " */
-
- /* We load the key */
- if (load_key)
- {
- memset(key, 0, MEMCACHED_MAX_KEY);
- for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++)
- {
- *key= *string_ptr;
- key++;
- }
- }
- else /* Skip characters */
- for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
-
- if (end_ptr == string_ptr)
- goto read_error;
-
- /* Flags fetch move past space */
- string_ptr++;
- if (end_ptr == string_ptr)
- goto read_error;
-
- for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
- *flags= (uint16_t)strtol(next_ptr, &string_ptr, 10);
-
- if (end_ptr == string_ptr)
- goto read_error;
-
- /* Length fetch move past space*/
- string_ptr++;
- if (end_ptr == string_ptr)
- goto read_error;
-
- for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
- *value_length= (size_t)strtoll(next_ptr, &string_ptr, 10);
-
- if (end_ptr == string_ptr)
- goto read_error;
-
- /* Skip past the \r\n */
- string_ptr+= 2;
-
- if (end_ptr < string_ptr)
- goto read_error;
-
- if (*value_length)
- {
- size_t read_length;
- char *value;
-
- /* We add two bytes so that we can walk the \r\n */
- value= (char *)malloc(((*value_length) +2) * sizeof(char));
-
- if (!value)
- {
- *value_length= 0;
- *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
- return NULL;
- }
-
- read_length= read(ptr->hosts[server_key].fd, value, (*value_length)+2);
-
- if (read_length != (size_t)(*value_length + 2))
- {
- free(value);
- goto read_error;
- }
-
- return value;
- }
- }
-
- return NULL;
-read_error:
- *error= MEMCACHED_PARTIAL_READ;
- return NULL;
-}
+#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)
{
+ return memcached_get_by_key(ptr, NULL, 0, key, key_length, value_length,
+ flags, error);
+}
+
+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];
- unsigned int server_key;
-
- *value_length= 0;
- *error= memcached_connect(ptr);
+ memcached_result_st *result_buffer= &ptr->result;
+ memcached_return rc[MEMCACHED_MAX_REPLICAS];
+ uint8_t replicas= 0;
- if (*error != MEMCACHED_SUCCESS)
- return NULL;
-
- server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
-
- send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
- (int)key_length, key);
- if (*error != MEMCACHED_SUCCESS)
+ if (ptr->number_of_hosts == 0)
+ {
+ *error= MEMCACHED_NO_SERVERS;
return NULL;
+ }
- if ((write(ptr->hosts[server_key].fd, buffer, send_length) == -1))
+ if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test(&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
{
- *error= MEMCACHED_WRITE_FAILURE;
+ *value_length= 0;
+ *error= MEMCACHED_BAD_KEY_PROVIDED;
return NULL;
}
- return memcached_value_fetch(ptr, key, &key_length, value_length, flags,
- error, 0, server_key);
-}
-
-memcached_return memcached_mget(memcached_st *ptr,
- char **keys, size_t *key_length,
- unsigned int number_of_keys)
-{
- char buffer[HUGE_STRING_LEN];
- unsigned int x;
- memcached_return rc;
- memcached_string_st **cursor_key_exec;
-
- ptr->cursor_server= 0;
- memset(buffer, 0, HUGE_STRING_LEN);
+ if (master_key)
+ server_key= memcached_generate_hash(ptr, master_key, master_key_length);
+ else
+ server_key= memcached_generate_hash(ptr, key, key_length);
- rc= memcached_connect(ptr);
+ send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
+ "get %.*s\r\n", (int)key_length, key);
- if (rc != MEMCACHED_SUCCESS)
- return rc;
-
- cursor_key_exec= (memcached_string_st **)malloc(sizeof(memcached_string_st *) * ptr->number_of_hosts);
- memset(cursor_key_exec, 0, sizeof(memcached_string_st *) * ptr->number_of_hosts);
-
-
- for (x= 0; x < number_of_keys; x++)
+ do
{
- unsigned int server_key;
-
- server_key= memcached_generate_hash(keys[x], key_length[x]) % ptr->number_of_hosts;
+ char response_buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- if (cursor_key_exec[server_key])
+ if (memcached_server_response_count(&ptr->hosts[server_key]))
{
- memcached_string_st *string= cursor_key_exec[server_key];
+ if (ptr->flags & MEM_NO_BLOCK)
+ (void)memcached_io_write(&ptr->hosts[server_key], NULL, 0, 1);
- memcached_string_append_character(ptr, string, ' ');
- memcached_string_append(ptr, string, keys[x], key_length[x]);
+ while(memcached_server_response_count(&ptr->hosts[server_key]))
+ (void)memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
}
- else
- {
- memcached_string_st *string= memcached_string_init(ptr, SMALL_STRING_LEN);
- if (!string)
- assert(0);
+ rc[replicas]= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
+ if (rc[replicas] != MEMCACHED_SUCCESS)
+ goto error;
- memcached_string_append(ptr, string, "get ", 4);
- memcached_string_append(ptr, string, keys[x], key_length[x]);
+ rc[replicas]= memcached_response(&ptr->hosts[server_key], response_buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, result_buffer);
- cursor_key_exec[server_key]= string;
+ /* 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;
+ *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 (cursor_key_exec[x])
+ /* On error we just jump to the next potential server */
+error:
+ if (ptr->number_of_replicas > 1)
{
- memcached_string_st *string= cursor_key_exec[x];
- memcached_string_append(ptr, string, "\r\n", 2);
-
- if ((write(ptr->hosts[x].fd, string->string,
- memcached_string_length(ptr, string)) == -1))
- {
- memcached_quit(ptr);
- rc= MEMCACHED_SOME_ERRORS;
- }
- memcached_string_free(ptr, string);
- cursor_key_exec[x]= NULL; /* Remove warning */
+ if (server_key == (ptr->number_of_hosts - 1))
+ server_key= 0;
+ else
+ server_key++;
}
- }
-
- free(cursor_key_exec);
+ } while ((++replicas) < ptr->number_of_replicas);
- return rc;
-}
-
-char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
- size_t *value_length,
- uint16_t *flags,
- memcached_return *error)
-{
- char *value_check;
+ /* 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];
- while (ptr->cursor_server < ptr->number_of_hosts)
- {
- value_check= memcached_value_fetch(ptr, key, key_length, value_length, flags,
- error, 1, ptr->cursor_server);
-
- if (*error == MEMCACHED_NOTFOUND)
- ptr->cursor_server++;
- else
- return value_check;
- }
+ *value_length= 0;
return NULL;
}
projects / awesomized / libmemcached / blobdiff