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 #include <libmemcached/memcached/protocol_binary.h>
  40
  41 static memcached_return_t ascii_touch(memcached_instance_st* 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)+1 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     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  67   }
  68
  69   return rc;
  70 }
  71
  72 static memcached_return_t binary_touch(memcached_instance_st* instance,
  73                                        const char *key, size_t key_length,
  74                                        time_t expiration)
  75 {
  76   protocol_binary_request_touch request= {}; //{.bytes= {0}};
  77
  78   initialize_binary_request(instance, request.message.header);
  79
  80   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_TOUCH;
  81   request.message.header.request.extlen= 4;
  82   request.message.header.request.keylen= htons((uint16_t)(key_length +memcached_array_size(instance->root->_namespace)));
  83   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  84   request.message.header.request.bodylen= htonl((uint32_t)(key_length +memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
  85   request.message.body.expiration= htonl((uint32_t) expiration);
  86
  87   libmemcached_io_vector_st vector[]=
  88   {
  89     { NULL, 0 },
  90     { request.bytes, sizeof(request.bytes) },
  91     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  92     { key, key_length }
  93   };
  94
  95   memcached_return_t rc;
  96   if (memcached_failed(rc= memcached_vdo(instance, vector, 4, true)))
  97   {
  98     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  99   }
 100
 101   return rc;
 102 }
 103
 104 memcached_return_t memcached_touch(memcached_st *ptr,
 105                                    const char *key, size_t key_length,
 106                                    time_t expiration)
 107 {
 108   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
 109 }
 110
 111 memcached_return_t memcached_touch_by_key(memcached_st *shell,
 112                                           const char *group_key, size_t group_key_length,
 113                                           const char *key, size_t key_length,
 114                                           time_t expiration)
 115 {
 116   Memcached* ptr= memcached2Memcached(shell);
 117   LIBMEMCACHED_MEMCACHED_TOUCH_START();
 118
 119   memcached_return_t rc;
 120   if (memcached_failed(rc= initialize_query(ptr, true)))
 121   {
 122     return rc;
 123   }
 124
 125   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 126   {
 127     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 128   }
 129
 130   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 131   memcached_instance_st* instance= memcached_instance_fetch(ptr, server_key);
 132
 133   if (ptr->flags.binary_protocol)
 134   {
 135     rc= binary_touch(instance, key, key_length, expiration);
 136   }
 137   else
 138   {
 139     rc= ascii_touch(instance, key, key_length, expiration);
 140   }
 141
 142   if (memcached_failed(rc))
 143   {
 144     return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while writing touch command to server"));
 145   }
 146
 147   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 148   rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 149
 150   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND)
 151   {
 152     return rc;
 153   }
 154
 155   return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while reading response"));
 156 }