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   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
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  37
  38 #include <libmemcached/common.h>
  39 #include <libmemcached/memcached/protocol_binary.h>
  40
  41 static memcached_return_t ascii_touch(org::libmemcached::Instance* instance,
  42                                       const char *key, size_t key_length,
  43                                       time_t expiration)
  44 {
  45   char expiration_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
  46   int expiration_buffer_length= snprintf(expiration_buffer, sizeof(expiration_buffer), " %llu", (unsigned long long)expiration);
  47   if (size_t(expiration_buffer_length) >= sizeof(expiration_buffer) or expiration_buffer_length < 0)
  48   {
  49     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  50                                memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
  51   }
  52
  53   libmemcached_io_vector_st vector[]=
  54   {
  55     { NULL, 0 },
  56     { memcached_literal_param("touch ") },
  57     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  58     { key, key_length },
  59     { expiration_buffer, size_t(expiration_buffer_length) },
  60     { memcached_literal_param("\r\n") }
  61   };
  62
  63   memcached_return_t rc;
  64   if (memcached_failed(rc= memcached_vdo(instance, vector, 6, true)))
  65   {
  66     memcached_io_reset(instance);
  67     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  68   }
  69
  70   return rc;
  71 }
  72
  73 static memcached_return_t binary_touch(org::libmemcached::Instance* instance,
  74                                        const char *key, size_t key_length,
  75                                        time_t expiration)
  76 {
  77   protocol_binary_request_touch request= {}; //{.bytes= {0}};
  78
  79   initialize_binary_request(instance, request.message.header);
  80
  81   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_TOUCH;
  82   request.message.header.request.extlen= 4;
  83   request.message.header.request.keylen= htons((uint16_t)(key_length +memcached_array_size(instance->root->_namespace)));
  84   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  85   request.message.header.request.bodylen= htonl((uint32_t)(key_length +memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
  86   request.message.body.expiration= htonl((uint32_t) expiration);
  87
  88   libmemcached_io_vector_st vector[]=
  89   {
  90     { NULL, 0 },
  91     { request.bytes, sizeof(request.bytes) },
  92     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  93     { key, key_length }
  94   };
  95
  96   memcached_return_t rc;
  97   if (memcached_failed(rc= memcached_vdo(instance, vector, 4, true)))
  98   {
  99     memcached_io_reset(instance);
 100     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
 101   }
 102
 103   return rc;
 104 }
 105
 106 memcached_return_t memcached_touch(memcached_st *ptr,
 107                                    const char *key, size_t key_length,
 108                                    time_t expiration)
 109 {
 110   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
 111 }
 112
 113 memcached_return_t memcached_touch_by_key(memcached_st *ptr,
 114                                           const char *group_key, size_t group_key_length,
 115                                           const char *key, size_t key_length,
 116                                           time_t expiration)
 117 {
 118   LIBMEMCACHED_MEMCACHED_TOUCH_START();
 119
 120   memcached_return_t rc;
 121   if (memcached_failed(rc= initialize_query(ptr, true)))
 122   {
 123     return rc;
 124   }
 125
 126   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 127   {
 128     return rc;
 129   }
 130
 131   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 132   org::libmemcached::Instance* instance= memcached_instance_fetch(ptr, server_key);
 133
 134   if (ptr->flags.binary_protocol)
 135   {
 136     rc= binary_touch(instance, key, key_length, expiration);
 137   }
 138   else
 139   {
 140     rc= ascii_touch(instance, key, key_length, expiration);
 141   }
 142
 143   if (memcached_failed(rc))
 144   {
 145     return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while writing touch command to server"));
 146   }
 147
 148   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 149   rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 150
 151   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND)
 152   {
 153     return rc;
 154   }
 155
 156   return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while reading response"));
 157 }