#include "common.h"
#include "memcached_io.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;
-
- memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
- end_ptr= buffer + MEMCACHED_DEFAULT_COMMAND_SIZE;
-
- *value_length= 0;
- *flags= 0;
-
- *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);
- *key_length= 0;
-
- for (; end_ptr > string_ptr && *string_ptr != ' '; string_ptr++)
- {
- *key= *string_ptr;
- key++;
- (*key_length)++;
- }
- }
- 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;
- size_t to_read;
- char *value;
- char *value_ptr;
-
- /* 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;
- }
- memset(value, 0, ((*value_length) +2) * sizeof(char));
-
- value_ptr= value;
- read_length= 0;
- /*
- We read the \r\n into the string since not doing so is more
- cycles then the waster of memory to do so.
-
- We are null terminating through, which will most likely make
- some people lazy about using the return length.
- */
- to_read= (*value_length) + 2;
-
- read_length= memcached_io_read(ptr, server_key,
- value_ptr, to_read);
-
- if (read_length != (size_t)(*value_length + 2))
- {
- free(value);
- goto read_error;
- }
-
- value[*value_length]= 0;
- value[(*value_length) + 1]= 0;
-
- return value;
- }
- }
- else if (*error == MEMCACHED_END)
- *error= MEMCACHED_NOTFOUND;
-
- return NULL;
-read_error:
- *error= MEMCACHED_PARTIAL_READ;
- return NULL;
-}
-
/*
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)
{
- char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
- char *buf_ptr= buffer;
- unsigned int server_key;
- char *value= NULL;
- LIBMEMCACHED_MEMCACHED_GET_START();
-
- server_key= memcached_generate_hash(ptr, key, key_length);
-
- *value_length= 0;
- *error= memcached_connect(ptr, server_key);
+ return memcached_get_by_key(ptr, NULL, 0, key, key_length, value_length,
+ flags, error);
+}
- if (*error != MEMCACHED_SUCCESS)
- goto 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)
+{
+ char *value;
- memcpy(buf_ptr, "get ", 4);
- buf_ptr+= 4;
- memcpy(buf_ptr, key, key_length);
- buf_ptr+= key_length;
- memcpy(buf_ptr, "\r\n", 2);
- buf_ptr+= 2;
+ /* Request the key */
+ *error= memcached_mget_by_key(ptr,
+ master_key,
+ master_key_length,
+ &key, &key_length, 1);
- if ((memcached_io_write(ptr, server_key, buffer, (size_t)(buf_ptr - buffer), 1)) == -1)
- {
- *error= MEMCACHED_WRITE_FAILURE;
- goto error;
- }
+ value= memcached_fetch(ptr, NULL, NULL,
+ value_length, flags, error);
- value= memcached_value_fetch(ptr, key, &key_length, value_length, flags,
- error, 0, server_key);
- if (*error == MEMCACHED_END && *value_length == 0)
- {
+ /* This is for historical reasons */
+ if (*error == MEMCACHED_END)
*error= MEMCACHED_NOTFOUND;
- goto error;
- }
- else if (*error == MEMCACHED_END)
- {
- WATCHPOINT_ASSERT(0); /* If this happens we have somehow messed up the fetch */
- }
- else if (*error == MEMCACHED_SUCCESS)
- {
- memcached_return rc;
- /* We need to read END */
- rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
- if (rc != MEMCACHED_END)
- {
- *error= MEMCACHED_PROTOCOL_ERROR;
- goto error;
- }
- }
- else
- goto error;
+ if (value == NULL)
+ return NULL;
- LIBMEMCACHED_MEMCACHED_GET_END();
+ memcached_finish(ptr);
return value;
-
-error:
- free(value);
- *value_length= 0;
-
- LIBMEMCACHED_MEMCACHED_GET_END();
-
- return NULL;
}
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 *cursor_key_exec;
+ 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;
- cursor_key_exec= (char *)malloc(sizeof(char) * ptr->number_of_hosts);
- memset(cursor_key_exec, 0, sizeof(char) * ptr->number_of_hosts);
+ if (ptr->number_of_hosts == 0)
+ return MEMCACHED_NO_SERVERS;
+ if (ptr->flags & MEM_SUPPORT_CAS)
+ {
+ get_command= "gets ";
+ get_command_length= 5;
+ }
+
+ memcached_finish(ptr);
+
+ if (master_key && master_key_length)
+ master_server_key= memcached_generate_hash(ptr, master_key, master_key_length);
+
+ /*
+ 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;
- server_key= memcached_generate_hash(ptr, keys[x], key_length[x]);
+ if (master_server_key)
+ server_key= master_server_key;
+ else
+ server_key= memcached_generate_hash(ptr, keys[x], key_length[x]);
- if (cursor_key_exec[server_key] == 0)
+ if (ptr->hosts[server_key].cursor_active == 0)
{
rc= memcached_connect(ptr, server_key);
- if ((memcached_io_write(ptr, server_key, "get ", 4, 0)) == -1)
+ if ((memcached_io_write(ptr, server_key, get_command, get_command_length, 0)) == -1)
{
- memcached_quit(ptr);
rc= MEMCACHED_SOME_ERRORS;
- break;
+ continue;
}
+ ptr->hosts[server_key].cursor_active= 1;
}
if ((memcached_io_write(ptr, server_key, keys[x], key_length[x], 0)) == -1)
{
- memcached_quit(ptr);
+ ptr->hosts[server_key].cursor_active= 0;
rc= MEMCACHED_SOME_ERRORS;
- break;
+ continue;
}
if ((memcached_io_write(ptr, server_key, " ", 1, 0)) == -1)
{
- memcached_quit(ptr);
+ ptr->hosts[server_key].cursor_active= 0;
rc= MEMCACHED_SOME_ERRORS;
- break;
+ continue;
}
- cursor_key_exec[server_key]= 1;
}
-
/*
Should we muddle on if some servers are dead?
*/
for (x= 0; x < ptr->number_of_hosts; x++)
{
- if (cursor_key_exec[x])
+ if (ptr->hosts[x].cursor_active == 1)
{
/* We need to doo something about non-connnected hosts in the future */
if ((memcached_io_write(ptr, x, "\r\n", 2, 1)) == -1)
{
- memcached_quit(ptr);
rc= MEMCACHED_SOME_ERRORS;
- break;
}
-
- ptr->hosts[x].cursor_active= 1;
}
- else
- ptr->hosts[x].cursor_active= 0;
}
- free(cursor_key_exec);
-
LIBMEMCACHED_MEMCACHED_MGET_END();
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;
-
- while (ptr->cursor_server < ptr->number_of_hosts)
- {
- if (!ptr->hosts[ptr->cursor_server].cursor_active)
- {
- ptr->cursor_server++;
- continue;
- }
-
- 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 if (*error == MEMCACHED_END && *value_length == 0)
- return NULL;
- else if (*error == MEMCACHED_END)
- {
- WATCHPOINT_ASSERT(0); /* If this happens we have somehow messed up the fetch */
- }
- else if (*error != MEMCACHED_SUCCESS)
- return NULL;
- else
- return value_check;
-
- }
-
- *value_length= 0;
- return NULL;
-}
projects / awesomized / libmemcached / blobdiff