-#include <memcached.h>
+#include "common.h"
+#include "memcached_io.h"
-char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
- size_t *value_length,
- uint16_t *flags,
- memcached_return *error)
+static memcached_return memcached_value_fetch(memcached_st *ptr, char *key, size_t *key_length,
+ memcached_string_st *value,
+ uint16_t *flags,
+ uint64_t *cas,
+ unsigned int server_key)
{
- size_t send_length;
+ memcached_return rc;
char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
char *string_ptr;
- unsigned int server_key;
+ char *end_ptr;
- *error= memcached_connect(ptr);
+ end_ptr= buffer + MEMCACHED_DEFAULT_COMMAND_SIZE;
- if (*error != MEMCACHED_SUCCESS)
- return NULL;
+ if (flags)
+ *flags= 0;
- server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
+ memcached_string_reset(value);
- send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
- key_length, key);
- if (*error != MEMCACHED_SUCCESS)
- return NULL;
+ rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
- if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
- {
- fprintf(stderr, "failed fetch on %.*s TCP\n", key_length+1, key);
- *error= MEMCACHED_WRITE_FAILURE;
- return NULL;
- }
-
- memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
- *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
- if (*error == MEMCACHED_SUCCESS)
+ if (rc == MEMCACHED_SUCCESS)
{
- char *end_ptr;
+ char *next_ptr;
+ size_t value_length;
string_ptr= buffer;
string_ptr+= 6; /* "VALUE " */
- /* We do nothing with the key, since we only asked for one key */
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
+ /* We load the key */
+ if (key)
+ {
+ *key_length= 0;
+
+ for (; isalnum(*string_ptr); string_ptr++)
+ {
+ *key= *string_ptr;
+ key++;
+ (*key_length)++;
+ }
+ }
+ else /* Skip characters */
+ for (; isalnum(*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; isdigit(*string_ptr); string_ptr++);
+ if (flags)
+ *flags= (uint16_t)strtol(next_ptr, &string_ptr, 10);
- /* 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);
+ if (end_ptr == string_ptr)
+ goto read_error;
- /* Length fetch */
- string_ptr= end_ptr + 1;
- for (end_ptr= string_ptr; *end_ptr != ' '; end_ptr++);
- *value_length= strtoll(string_ptr, &end_ptr, 10);
+ /* Length fetch move past space*/
+ string_ptr++;
+ if (end_ptr == string_ptr)
+ goto read_error;
- /* Skip past the \r\n */
- string_ptr= end_ptr +2;
+ for (next_ptr= string_ptr; isdigit(*string_ptr); string_ptr++);
+ value_length= (size_t)strtoll(next_ptr, &string_ptr, 10);
- if (*value_length)
+ if (end_ptr == string_ptr)
+ goto read_error;
+
+ /* Skip spaces */
+ if (*string_ptr == '\r')
+ {
+ /* Skip past the \r\n */
+ string_ptr+= 2;
+ }
+ else
{
- size_t need_to_copy;
- char *pos_ptr;
- char *value;
+ string_ptr++;
+ for (next_ptr= string_ptr; isdigit(*string_ptr); string_ptr++);
+ if (cas)
+ *cas= (size_t)strtoll(next_ptr, &string_ptr, 10);
+ }
- value= (char *)malloc(*value_length * sizeof(char));
+ if (end_ptr < string_ptr)
+ goto read_error;
+
+ if (value_length)
+ {
+ size_t read_length;
+ size_t to_read;
+ char *value_ptr;
- if (!value)
+ /* We add two bytes so that we can walk the \r\n */
+ rc= memcached_string_check(value, value_length+2);
+ if (rc != MEMCACHED_SUCCESS)
{
- *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
- return NULL;
+ value_length= 0;
+ return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
}
- need_to_copy= (*value_length < (size_t)(buffer-string_ptr))
- ? *value_length
- : (size_t)(buffer-string_ptr) ;
+ value_ptr= memcached_string_value(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.
- pos_ptr= memcpy(value, string_ptr, need_to_copy);
+ We are null terminating through, which will most likely make
+ some people lazy about using the return length.
+ */
+ to_read= (value_length) + 2;
- if ( need_to_copy > *value_length)
+ read_length= memcached_io_read(ptr, server_key,
+ value_ptr, to_read);
+
+ if (read_length != (size_t)(value_length + 2))
+ {
+ goto read_error;
+ }
+
+ /* This next bit blows the API, but this is internal....*/
{
- size_t read_length;
- size_t need_to_read;
+ char *char_ptr;
+ char_ptr= memcached_string_value(value);;
+ char_ptr[value_length]= 0;
+ char_ptr[value_length + 1]= 0;
+ memcached_string_set_length(value, value_length);
+ }
+
+ return MEMCACHED_SUCCESS;
+ }
+ }
+
+ return rc;
+
+read_error:
+ return MEMCACHED_PARTIAL_READ;
+}
+
+/*
+ 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,
+ memcached_return *error)
+{
+ char *value;
+ char *dummy_value;
+ size_t dummy_length;
+ uint16_t dummy_flags;
+ memcached_return dummy_error;
+
+ /* Request the key */
+ *error= memcached_mget(ptr, &key, &key_length, 1);
+
+ value= memcached_fetch(ptr, NULL, NULL,
+ value_length, flags, error);
+
+ if (*error == MEMCACHED_END)
+ *error= MEMCACHED_NOTFOUND;
+
+ if (value == NULL)
+ return NULL;
- need_to_read= *value_length - need_to_copy;
+ /* We do a second read to clean the cursor */
+ dummy_value= memcached_fetch(ptr, NULL, NULL,
+ &dummy_length, &dummy_flags,
+ &dummy_error);
- 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;
+ /* Something is really wrong if this happens */
+ WATCHPOINT_ASSERT(dummy_value == NULL);
+ if (dummy_value)
+ free(dummy_value);
- return NULL;
- }
+ return value;
+}
+
+memcached_return memcached_mget(memcached_st *ptr,
+ 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
+
+ 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_SUPPORT_CAS)
+ {
+ get_command= "gets ";
+ get_command_length= 5;
+ }
+
+ memcached_finish(ptr);
+
+ for (x= 0; x < number_of_keys; x++)
+ {
+ unsigned int server_key;
+
+ server_key= memcached_generate_hash(ptr, keys[x], key_length[x]);
+
+ if (ptr->hosts[server_key].cursor_active == 0)
+ {
+ rc= memcached_connect(ptr, server_key);
+
+ if ((memcached_io_write(ptr, server_key, get_command, get_command_length, 0)) == -1)
+ {
+ memcached_quit_server(ptr, server_key);
+ rc= MEMCACHED_SOME_ERRORS;
+ continue;
+ }
+ ptr->hosts[server_key].cursor_active= 1;
+ }
+
+ if ((memcached_io_write(ptr, server_key, keys[x], key_length[x], 0)) == -1)
+ {
+ ptr->hosts[server_key].cursor_active= 0;
+ memcached_quit_server(ptr, server_key);
+ rc= MEMCACHED_SOME_ERRORS;
+ continue;
+ }
+
+ if ((memcached_io_write(ptr, server_key, " ", 1, 0)) == -1)
+ {
+ ptr->hosts[server_key].cursor_active= 0;
+ memcached_quit_server(ptr, server_key);
+ rc= MEMCACHED_SOME_ERRORS;
+ continue;
+ }
+ }
+
+ /*
+ Should we muddle on if some servers are dead?
+ */
+ for (x= 0; x < ptr->number_of_hosts; 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_server(ptr, x);
+ rc= MEMCACHED_SOME_ERRORS;
}
+ }
+ }
+
+ LIBMEMCACHED_MEMCACHED_MGET_END();
+ return rc;
+}
- return value;
+char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
+ size_t *value_length,
+ uint16_t *flags,
+ memcached_return *error)
+{
+ memcached_string_st *result_buffer;
+ result_buffer= &ptr->result_buffer;
+
+ while (ptr->cursor_server < ptr->number_of_hosts)
+ {
+ if (!ptr->hosts[ptr->cursor_server].cursor_active)
+ {
+ ptr->cursor_server++;
+ continue;
}
+
+ *error = memcached_value_fetch(ptr, key, key_length, result_buffer,
+ flags, NULL, ptr->cursor_server);
+ *value_length= memcached_string_length(result_buffer);
+
+ if (*error == MEMCACHED_END) /* END means that we move on to the next */
+ {
+ ptr->hosts[ptr->cursor_server].cursor_active= 0;
+ ptr->cursor_server++;
+ continue;
+ }
+ else if (*error == MEMCACHED_SUCCESS)
+ return memcached_string_c_copy(result_buffer);
+ else
+ return NULL;
}
+ ptr->cursor_server= 0;
+ *value_length= 0;
return NULL;
}
+
+memcached_result_st *memcached_fetch_result(memcached_st *ptr,
+ memcached_result_st *result,
+ memcached_return *error)
+{
+ if (result == NULL)
+ result= memcached_result_create(ptr, NULL);
+
+ WATCHPOINT_ASSERT(result->value.is_allocated != MEMCACHED_USED);
+
+ while (ptr->cursor_server < ptr->number_of_hosts)
+ {
+ if (!ptr->hosts[ptr->cursor_server].cursor_active)
+ {
+ ptr->cursor_server++;
+ continue;
+ }
+
+ result->cas= 0; /* We do this so we do not send in any junk */
+ *error= memcached_value_fetch(ptr, result->key, &result->key_length,
+ &result->value,
+ &result->flags,
+ &result->cas,
+ ptr->cursor_server);
+
+ if (*error == MEMCACHED_END) /* END means that we move on to the next */
+ {
+ ptr->hosts[ptr->cursor_server].cursor_active= 0;
+ ptr->cursor_server++;
+ continue;
+ }
+ else if (*error == MEMCACHED_SUCCESS)
+ return result;
+ else
+ return NULL;
+ }
+
+ /* An error has occurred */
+ if (result->is_allocated == MEMCACHED_ALLOCATED)
+ memcached_result_free(result);
+ else
+ memcached_string_reset(&result->value);
+
+ ptr->cursor_server= 0;
+ return NULL;
+}
+
+memcached_return memcached_finish_server(memcached_st *ptr, unsigned int server_key)
+{
+ memcached_return rc;
+ memcached_string_st *result_buffer;
+
+ result_buffer= &ptr->result_buffer;
+
+ rc= MEMCACHED_SUCCESS;
+ while (rc == MEMCACHED_SUCCESS)
+ {
+ rc= memcached_value_fetch(ptr, NULL, NULL, result_buffer,
+ NULL, NULL, server_key);
+ }
+ ptr->hosts[server_key].cursor_active= 0;
+
+ return rc;
+}
+
+void memcached_finish(memcached_st *ptr)
+{
+ unsigned int x;
+
+ for (x= 0; x < ptr->number_of_hosts; x++)
+ {
+ if (ptr->hosts[x].cursor_active)
+ (void)memcached_finish_server(ptr, x);
+ }
+
+ ptr->cursor_server= 0;
+}
projects / awesomized / libmemcached / blobdiff