git.m6w6.name Git - m6w6/libmemcached/blob - src/libmemcached/touch.cc

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "libmemcached/common.h"
  17
  18 static memcached_return_t ascii_touch(memcached_instance_st *instance, const char *key,
  19                                       size_t key_length, time_t expiration) {
  20   char expiration_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH + 1];
  21   int expiration_buffer_length = snprintf(expiration_buffer, sizeof(expiration_buffer), " %llu",
  22                                           (unsigned long long) expiration);
  23   if (size_t(expiration_buffer_length) >= sizeof(expiration_buffer) + 1
  24       or expiration_buffer_length < 0)
  25   {
  26     return memcached_set_error(
  27         *instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  28         memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
  29   }
  30
  31   libmemcached_io_vector_st vector[] = {{NULL, 0},
  32                                         {memcached_literal_param("touch ")},
  33                                         {memcached_array_string(instance->root->_namespace),
  34                                          memcached_array_size(instance->root->_namespace)},
  35                                         {key, key_length},
  36                                         {expiration_buffer, size_t(expiration_buffer_length)},
  37                                         {memcached_literal_param("\r\n")}};
  38
  39   memcached_return_t rc;
  40   if (memcached_failed(rc = memcached_vdo(instance, vector, 6, true))) {
  41     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  42   }
  43
  44   return rc;
  45 }
  46
  47 static memcached_return_t binary_touch(memcached_instance_st *instance, const char *key,
  48                                        size_t key_length, time_t expiration) {
  49   protocol_binary_request_touch request = {}; //{.bytes= {0}};
  50
  51   initialize_binary_request(instance, request.message.header);
  52
  53   request.message.header.request.opcode = PROTOCOL_BINARY_CMD_TOUCH;
  54   request.message.header.request.extlen = 4;
  55   request.message.header.request.keylen =
  56       htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
  57   request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
  58   request.message.header.request.bodylen =
  59       htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace)
  60                        + request.message.header.request.extlen));
  61   request.message.body.expiration = htonl((uint32_t) expiration);
  62
  63   libmemcached_io_vector_st vector[] = {{NULL, 0},
  64                                         {request.bytes, sizeof(request.bytes)},
  65                                         {memcached_array_string(instance->root->_namespace),
  66                                          memcached_array_size(instance->root->_namespace)},
  67                                         {key, key_length}};
  68
  69   memcached_return_t rc;
  70   if (memcached_failed(rc = memcached_vdo(instance, vector, 4, true))) {
  71     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  72   }
  73
  74   return rc;
  75 }
  76
  77 memcached_return_t memcached_touch(memcached_st *ptr, const char *key, size_t key_length,
  78                                    time_t expiration) {
  79   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
  80 }
  81
  82 memcached_return_t memcached_touch_by_key(memcached_st *shell, const char *group_key,
  83                                           size_t group_key_length, const char *key,
  84                                           size_t key_length, time_t expiration) {
  85   Memcached *ptr = memcached2Memcached(shell);
  86   LIBMEMCACHED_MEMCACHED_TOUCH_START();
  87
  88   memcached_return_t rc;
  89   if (memcached_failed(rc = initialize_query(ptr, true))) {
  90     return rc;
  91   }
  92
  93   if (memcached_failed(rc = memcached_key_test(*ptr, (const char **) &key, &key_length, 1))) {
  94     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
  95   }
  96
  97   uint32_t server_key =
  98       memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
  99   memcached_instance_st *instance = memcached_instance_fetch(ptr, server_key);
 100
 101   if (ptr->flags.binary_protocol) {
 102     rc = binary_touch(instance, key, key_length, expiration);
 103   } else {
 104     rc = ascii_touch(instance, key, key_length, expiration);
 105   }
 106
 107   if (memcached_failed(rc)) {
 108     return memcached_set_error(
 109         *instance, rc, MEMCACHED_AT,
 110         memcached_literal_param("Error occcured while writing touch command to server"));
 111   }
 112
 113   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 114   rc = memcached_response(instance, buffer, sizeof(buffer), NULL);
 115
 116   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND) {
 117     return rc;
 118   }
 119
 120   return memcached_set_error(*instance, rc, MEMCACHED_AT,
 121                              memcached_literal_param("Error occcured while reading response"));
 122 }