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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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   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 memcached_return_t memcached_delete(memcached_st *ptr, const char *key, size_t key_length,
  42                                     time_t expiration)
  43 {
  44   return memcached_delete_by_key(ptr, key, key_length, key, key_length, expiration);
  45 }
  46
  47 static inline memcached_return_t ascii_delete(memcached_server_write_instance_st instance,
  48                                               uint32_t ,
  49                                               const char *key,
  50                                               const size_t key_length,
  51                                               const bool reply,
  52                                               const bool flush)
  53 {
  54   libmemcached_io_vector_st vector[]=
  55   {
  56     { NULL, 0 },
  57     { memcached_literal_param("delete ") },
  58     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  59     { key, key_length },
  60     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  61     { memcached_literal_param("\r\n") }
  62   };
  63
  64   /* Send command header */
  65   return memcached_vdo(instance, vector, 6, flush);
  66 }
  67
  68 static inline memcached_return_t binary_delete(memcached_server_write_instance_st instance,
  69                                                uint32_t server_key,
  70                                                const char *key,
  71                                                const size_t key_length,
  72                                                const bool reply,
  73                                                const bool flush)
  74 {
  75   protocol_binary_request_delete request= {};
  76
  77   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  78   if (reply)
  79   {
  80     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
  81   }
  82   else
  83   {
  84     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
  85   }
  86   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
  87   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  88   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace)));
  89
  90   libmemcached_io_vector_st vector[]=
  91   {
  92     { NULL, 0 },
  93     { request.bytes, sizeof(request.bytes) },
  94     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  95     { key, key_length }
  96   };
  97
  98   memcached_return_t rc= MEMCACHED_SUCCESS;
  99
 100   if ((rc= memcached_vdo(instance, vector,  4, flush)) != MEMCACHED_SUCCESS)
 101   {
 102     memcached_io_reset(instance);
 103   }
 104
 105   if (instance->root->number_of_replicas > 0)
 106   {
 107     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 108
 109     for (uint32_t x= 0; x < instance->root->number_of_replicas; ++x)
 110     {
 111
 112       ++server_key;
 113       if (server_key == memcached_server_count(instance->root))
 114       {
 115         server_key= 0;
 116       }
 117
 118       memcached_server_write_instance_st replica= memcached_server_instance_fetch(instance->root, server_key);
 119
 120       if (memcached_vdo(replica, vector, 4, flush) != MEMCACHED_SUCCESS)
 121       {
 122         memcached_io_reset(replica);
 123       }
 124       else
 125       {
 126         memcached_server_response_decrement(replica);
 127       }
 128     }
 129   }
 130
 131   return rc;
 132 }
 133
 134 memcached_return_t memcached_delete_by_key(memcached_st *ptr,
 135                                            const char *group_key, size_t group_key_length,
 136                                            const char *key, size_t key_length,
 137                                            time_t expiration)
 138 {
 139   LIBMEMCACHED_MEMCACHED_DELETE_START();
 140
 141   memcached_return_t rc;
 142   if (memcached_failed(rc= initialize_query(ptr, true)))
 143   {
 144     return rc;
 145   }
 146
 147   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 148   {
 149     return rc;
 150   }
 151
 152   if (expiration)
 153   {
 154     return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 155                                memcached_literal_param("Memcached server version does not allow expiration of deleted items"));
 156   }
 157
 158   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 159   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 160
 161   bool buffering= memcached_is_buffering(instance->root);
 162   bool reply= memcached_is_replying(instance->root);
 163
 164   // If a delete trigger exists, we need a response, so no buffering/noreply
 165   if (ptr->delete_trigger)
 166   {
 167     if (buffering)
 168     {
 169       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 170                                  memcached_literal_param("Delete triggers cannot be used if buffering is enabled"));
 171     }
 172
 173     if (reply == false)
 174     {
 175       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 176                                  memcached_literal_param("Delete triggers cannot be used if MEMCACHED_BEHAVIOR_NOREPLY is set"));
 177     }
 178   }
 179
 180   if (memcached_is_binary(ptr))
 181   {
 182     rc= binary_delete(instance, server_key, key, key_length, reply, buffering ? false : true);
 183   }
 184   else
 185   {
 186     rc= ascii_delete(instance, server_key, key, key_length, reply, buffering ? false : true);
 187   }
 188
 189   if (rc == MEMCACHED_SUCCESS)
 190   {
 191     if (buffering == true)
 192     {
 193       rc= MEMCACHED_BUFFERED;
 194     }
 195     else if (reply == false)
 196     {
 197       rc= MEMCACHED_SUCCESS;
 198     }
 199     else
 200     {
 201       char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 202       rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
 203       if (rc == MEMCACHED_DELETED)
 204       {
 205         rc= MEMCACHED_SUCCESS;
 206         if (ptr->delete_trigger)
 207         {
 208           ptr->delete_trigger(ptr, key, key_length);
 209         }
 210       }
 211     }
 212   }
 213
 214   LIBMEMCACHED_MEMCACHED_DELETE_END();
 215   return memcached_set_error(*ptr, rc, MEMCACHED_AT );
 216 }