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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(memcached_server_write_instance_st instance,
  42                                       const char *key, size_t key_length,
  43                                       time_t expiration)
  44 {
  45   char buffer[21];
  46
  47   int buffer_length= snprintf(buffer, sizeof(buffer), " %u", uint32_t(expiration));
  48   struct libmemcached_io_vector_st vector[]=
  49   {
  50     { memcached_literal_param("touch ") },
  51     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  52     { key, key_length },
  53     { buffer, buffer_length },
  54     { memcached_literal_param("\r\n") }
  55   };
  56
  57   memcached_return_t rc;
  58   if (memcached_failed(rc= memcached_vdo(instance, vector, 5, true)))
  59   {
  60     memcached_io_reset(instance);
  61     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  62   }
  63
  64   return rc;
  65 }
  66
  67 static memcached_return_t binary_touch(memcached_server_write_instance_st instance,
  68                                        const char *key, size_t key_length,
  69                                        time_t expiration)
  70 {
  71   protocol_binary_request_touch request= {}; //{.bytes= {0}};
  72   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  73   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_TOUCH;
  74   request.message.header.request.extlen= 4;
  75   request.message.header.request.keylen= htons((uint16_t)(key_length +memcached_array_size(instance->root->_namespace)));
  76   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  77   request.message.header.request.bodylen= htonl((uint32_t)(key_length +memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
  78   request.message.body.expiration= htonl((uint32_t) expiration);
  79
  80   struct libmemcached_io_vector_st vector[]=
  81   {
  82     { request.bytes, sizeof(request.bytes) },
  83     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  84     { key, key_length }
  85   };
  86
  87   memcached_return_t rc;
  88   if (memcached_failed(rc= memcached_vdo(instance, vector, 3, true)))
  89   {
  90     memcached_io_reset(instance);
  91     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  92   }
  93
  94   return rc;
  95 }
  96
  97 memcached_return_t memcached_touch(memcached_st *ptr,
  98                                    const char *key, size_t key_length,
  99                                    time_t expiration)
 100 {
 101   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
 102 }
 103
 104 memcached_return_t memcached_touch_by_key(memcached_st *ptr,
 105                                           const char *group_key, size_t group_key_length,
 106                                           const char *key, size_t key_length,
 107                                           time_t expiration)
 108 {
 109   LIBMEMCACHED_MEMCACHED_TOUCH_START();
 110
 111   memcached_return_t rc;
 112   if (memcached_failed(rc= initialize_query(ptr)))
 113   {
 114     return rc;
 115   }
 116
 117   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 118   {
 119     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 120   }
 121
 122   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 123   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 124
 125   if (ptr->flags.binary_protocol)
 126   {
 127     rc= binary_touch(instance, key, key_length, expiration);
 128   }
 129   else
 130   {
 131     rc= ascii_touch(instance, key, key_length, expiration);
 132   }
 133
 134   if (memcached_failed(rc))
 135   {
 136     return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while writing touch command to server"));
 137   }
 138
 139   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 140   rc= memcached_read_one_response(instance, buffer, sizeof(buffer), NULL);
 141
 142   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND)
 143   {
 144     return rc;
 145   }
 146
 147   return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while reading response"));
 148 }