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

   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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   8  *  Redistribution and use in source and binary forms, with or without
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  37
  38 #include <libmemcached/common.h>
  39
  40 static memcached_return_t ascii_touch(memcached_instance_st* instance,
  41                                       const char *key, size_t key_length,
  42                                       time_t expiration)
  43 {
  44   char expiration_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
  45   int expiration_buffer_length= snprintf(expiration_buffer, sizeof(expiration_buffer), " %llu", (unsigned long long)expiration);
  46   if (size_t(expiration_buffer_length) >= sizeof(expiration_buffer)+1 or expiration_buffer_length < 0)
  47   {
  48     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  49                                memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
  50   }
  51
  52   libmemcached_io_vector_st vector[]=
  53   {
  54     { NULL, 0 },
  55     { memcached_literal_param("touch ") },
  56     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  57     { key, key_length },
  58     { expiration_buffer, size_t(expiration_buffer_length) },
  59     { memcached_literal_param("\r\n") }
  60   };
  61
  62   memcached_return_t rc;
  63   if (memcached_failed(rc= memcached_vdo(instance, vector, 6, true)))
  64   {
  65     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  66   }
  67
  68   return rc;
  69 }
  70
  71 static memcached_return_t binary_touch(memcached_instance_st* instance,
  72                                        const char *key, size_t key_length,
  73                                        time_t expiration)
  74 {
  75   protocol_binary_request_touch request= {}; //{.bytes= {0}};
  76
  77   initialize_binary_request(instance, request.message.header);
  78
  79   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_TOUCH;
  80   request.message.header.request.extlen= 4;
  81   request.message.header.request.keylen= htons((uint16_t)(key_length +memcached_array_size(instance->root->_namespace)));
  82   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  83   request.message.header.request.bodylen= htonl((uint32_t)(key_length +memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
  84   request.message.body.expiration= htonl((uint32_t) expiration);
  85
  86   libmemcached_io_vector_st vector[]=
  87   {
  88     { NULL, 0 },
  89     { request.bytes, sizeof(request.bytes) },
  90     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  91     { key, key_length }
  92   };
  93
  94   memcached_return_t rc;
  95   if (memcached_failed(rc= memcached_vdo(instance, vector, 4, true)))
  96   {
  97     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  98   }
  99
 100   return rc;
 101 }
 102
 103 memcached_return_t memcached_touch(memcached_st *ptr,
 104                                    const char *key, size_t key_length,
 105                                    time_t expiration)
 106 {
 107   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
 108 }
 109
 110 memcached_return_t memcached_touch_by_key(memcached_st *shell,
 111                                           const char *group_key, size_t group_key_length,
 112                                           const char *key, size_t key_length,
 113                                           time_t expiration)
 114 {
 115   Memcached* ptr= memcached2Memcached(shell);
 116   LIBMEMCACHED_MEMCACHED_TOUCH_START();
 117
 118   memcached_return_t rc;
 119   if (memcached_failed(rc= initialize_query(ptr, true)))
 120   {
 121     return rc;
 122   }
 123
 124   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 125   {
 126     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 127   }
 128
 129   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 130   memcached_instance_st* instance= memcached_instance_fetch(ptr, server_key);
 131
 132   if (ptr->flags.binary_protocol)
 133   {
 134     rc= binary_touch(instance, key, key_length, expiration);
 135   }
 136   else
 137   {
 138     rc= ascii_touch(instance, key, key_length, expiration);
 139   }
 140
 141   if (memcached_failed(rc))
 142   {
 143     return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while writing touch command to server"));
 144   }
 145
 146   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 147   rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 148
 149   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND)
 150   {
 151     return rc;
 152   }
 153
 154   return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while reading response"));
 155 }