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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  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
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  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
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  20  *      * The names of its contributors may not be used to endorse or
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  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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 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   struct libmemcached_io_vector_st vector[]=
  54   {
  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, 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, 5, true)))
  64   {
  65     memcached_io_reset(instance);
  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_server_write_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   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  78   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_TOUCH;
  79   request.message.header.request.extlen= 4;
  80   request.message.header.request.keylen= htons((uint16_t)(key_length +memcached_array_size(instance->root->_namespace)));
  81   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  82   request.message.header.request.bodylen= htonl((uint32_t)(key_length +memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
  83   request.message.body.expiration= htonl((uint32_t) expiration);
  84
  85   struct libmemcached_io_vector_st vector[]=
  86   {
  87     { request.bytes, sizeof(request.bytes) },
  88     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  89     { key, key_length }
  90   };
  91
  92   memcached_return_t rc;
  93   if (memcached_failed(rc= memcached_vdo(instance, vector, 3, true)))
  94   {
  95     memcached_io_reset(instance);
  96     return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  97   }
  98
  99   return rc;
 100 }
 101
 102 memcached_return_t memcached_touch(memcached_st *ptr,
 103                                    const char *key, size_t key_length,
 104                                    time_t expiration)
 105 {
 106   return memcached_touch_by_key(ptr, key, key_length, key, key_length, expiration);
 107 }
 108
 109 memcached_return_t memcached_touch_by_key(memcached_st *ptr,
 110                                           const char *group_key, size_t group_key_length,
 111                                           const char *key, size_t key_length,
 112                                           time_t expiration)
 113 {
 114   LIBMEMCACHED_MEMCACHED_TOUCH_START();
 115
 116   memcached_return_t rc;
 117   if (memcached_failed(rc= initialize_query(ptr)))
 118   {
 119     return rc;
 120   }
 121
 122   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 123   {
 124     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 125   }
 126
 127   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 128   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 129
 130   if (ptr->flags.binary_protocol)
 131   {
 132     rc= binary_touch(instance, key, key_length, expiration);
 133   }
 134   else
 135   {
 136     rc= ascii_touch(instance, key, key_length, expiration);
 137   }
 138
 139   if (memcached_failed(rc))
 140   {
 141     return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while writing touch command to server"));
 142   }
 143
 144   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 145   rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 146
 147   if (rc == MEMCACHED_SUCCESS or rc == MEMCACHED_NOTFOUND)
 148   {
 149     return rc;
 150   }
 151
 152   return memcached_set_error(*instance, rc, MEMCACHED_AT, memcached_literal_param("Error occcured while reading response"));
 153 }