-#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;
- char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- char *string_ptr;
- unsigned int server_key;
-
- *value_length= 0;
- *error= memcached_connect(ptr);
+ return memcached_get_by_key(ptr, NULL, 0, key, key_length, value_length,
+ flags, error);
+}
- if (*error != MEMCACHED_SUCCESS)
+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)
+{
+ 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;
- server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
+ (void)memcached_fetch(ptr, NULL, NULL,
+ &dummy_length, &dummy_flags,
+ &dummy_error);
+ WATCHPOINT_ASSERT(dummy_length == 0);
- send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
- key_length, key);
- if (*error != MEMCACHED_SUCCESS)
- return NULL;
+ return value;
+}
- if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
+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;
+
+ if (ptr->number_of_hosts == 0)
+ return MEMCACHED_NO_SERVERS;
+
+ if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test(keys, key_length, number_of_keys) == MEMCACHED_BAD_KEY_PROVIDED))
+ return MEMCACHED_BAD_KEY_PROVIDED;
+
+ if (ptr->flags & MEM_SUPPORT_CAS)
{
- fprintf(stderr, "failed fetch on %.*s TCP\n", key_length+1, key);
- *error= MEMCACHED_WRITE_FAILURE;
- return NULL;
+ get_command= "gets ";
+ get_command_length= 5;
}
- memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
- *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
+ if (master_key && master_key_length)
+ master_server_key= memcached_generate_hash(ptr, master_key, master_key_length);
- if (*error == MEMCACHED_SUCCESS)
- {
- char *end_ptr;
+ /*
+ 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.
- string_ptr= buffer;
- string_ptr+= 6; /* "VALUE " */
+ It might be optimum to bounce the connection if count > some number.
+ */
+ for (x= 0; x < ptr->number_of_hosts; x++)
+ {
+ if (memcached_server_response_count(&ptr->hosts[x]))
+ {
+ char 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++);
+ if (ptr->flags & MEM_NO_BLOCK)
+ (void)memcached_io_write(&ptr->hosts[x], NULL, 0, 1);
- /* 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);
+ while(memcached_server_response_count(&ptr->hosts[x]))
+ (void)memcached_response(&ptr->hosts[x], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, &ptr->result);
+ }
+ }
- /* Length fetch */
- string_ptr= end_ptr + 1;
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
- *value_length= strtoll(string_ptr, &end_ptr, 10);
+ /*
+ 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;
- /* Skip past the \r\n */
- string_ptr= end_ptr +2;
+ if (master_server_key)
+ server_key= master_server_key;
+ else
+ server_key= memcached_generate_hash(ptr, keys[x], key_length[x]);
- if (*value_length)
+ if (memcached_server_response_count(&ptr->hosts[server_key]) == 0)
{
- size_t need_to_copy;
- char *pos_ptr;
- char *value;
+ rc= memcached_connect(&ptr->hosts[server_key]);
- value= (char *)malloc(*value_length * sizeof(char));
+ if (rc != MEMCACHED_SUCCESS)
+ continue;
- if (!value)
+ if ((memcached_io_write(&ptr->hosts[server_key], get_command, get_command_length, 0)) == -1)
{
- *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
- return NULL;
+ 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);
+ }
- need_to_copy= (*value_length < (size_t)(buffer-string_ptr))
- ? *value_length
- : (size_t)(buffer-string_ptr) ;
+ if ((memcached_io_write(&ptr->hosts[server_key], keys[x], key_length[x], 0)) == -1)
+ {
+ memcached_server_response_reset(&ptr->hosts[server_key]);
+ rc= MEMCACHED_SOME_ERRORS;
+ continue;
+ }
- pos_ptr= memcpy(value, string_ptr, need_to_copy);
+ if ((memcached_io_write(&ptr->hosts[server_key], " ", 1, 0)) == -1)
+ {
+ memcached_server_response_reset(&ptr->hosts[server_key]);
+ rc= MEMCACHED_SOME_ERRORS;
+ continue;
+ }
+ }
- if ( need_to_copy > *value_length)
+ /*
+ 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]))
+ {
+ /* We need to do something about non-connnected hosts in the future */
+ if ((memcached_io_write(&ptr->hosts[x], "\r\n", 2, 1)) == -1)
{
- size_t read_length;
- size_t need_to_read;
-
- need_to_read= *value_length - need_to_copy;
-
- 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;
-
- return NULL;
- }
+ rc= MEMCACHED_SOME_ERRORS;
}
-
- return value;
}
}
- return NULL;
+ LIBMEMCACHED_MEMCACHED_MGET_END();
+ return rc;
}
projects / m6w6 / libmemcached / blobdiff