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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  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
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  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  35  */
  36
  37 #include <libmemcached/common.h>
  38
  39 static memcached_return_t memcached_flush_binary(memcached_st *ptr,
  40                                                  time_t expiration);
  41 static memcached_return_t memcached_flush_textual(memcached_st *ptr,
  42                                                   time_t expiration);
  43
  44 memcached_return_t memcached_flush(memcached_st *ptr, time_t expiration)
  45 {
  46   memcached_return_t rc;
  47   if (memcached_failed(rc= initialize_query(ptr)))
  48   {
  49     return rc;
  50   }
  51
  52   LIBMEMCACHED_MEMCACHED_FLUSH_START();
  53   if (ptr->flags.binary_protocol)
  54   {
  55     rc= memcached_flush_binary(ptr, expiration);
  56   }
  57   else
  58   {
  59     rc= memcached_flush_textual(ptr, expiration);
  60   }
  61   LIBMEMCACHED_MEMCACHED_FLUSH_END();
  62
  63   return rc;
  64 }
  65
  66 static memcached_return_t memcached_flush_textual(memcached_st *ptr,
  67                                                   time_t expiration)
  68 {
  69   bool reply= ptr->flags.no_reply ? false : true;
  70
  71   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  72   int send_length;
  73   if (expiration)
  74   {
  75     send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  76                           "flush_all %llu%s\r\n",
  77                           (unsigned long long)expiration, reply ? "" :  " noreply");
  78   }
  79   else
  80   {
  81     send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  82                           "flush_all%s\r\n", reply ? "" : " noreply");
  83   }
  84
  85   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE or send_length < 0)
  86   {
  87     return memcached_set_error(*ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  88                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  89   }
  90
  91
  92   memcached_return_t rc= MEMCACHED_SUCCESS;
  93   for (unsigned int x= 0; x < memcached_server_count(ptr); x++)
  94   {
  95     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
  96
  97     memcached_return_t rrc= memcached_do(instance, buffer, (size_t)send_length, true);
  98     if (rrc == MEMCACHED_SUCCESS and reply == true)
  99     {
 100       char response_buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 101       rrc= memcached_response(instance, response_buffer, sizeof(response_buffer), NULL);
 102     }
 103
 104     if (memcached_failed(rrc))
 105     {
 106       // If an error has already been reported, then don't add to it
 107       if (instance->error_messages == NULL)
 108       {
 109         memcached_set_error(*instance, rrc, MEMCACHED_AT);
 110       }
 111       rc= MEMCACHED_SOME_ERRORS;
 112     }
 113   }
 114
 115   return rc;
 116 }
 117
 118 static memcached_return_t memcached_flush_binary(memcached_st *ptr,
 119                                                  time_t expiration)
 120 {
 121   protocol_binary_request_flush request= {};
 122
 123   request.message.header.request.magic= (uint8_t)PROTOCOL_BINARY_REQ;
 124   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSH;
 125   request.message.header.request.extlen= 4;
 126   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 127   request.message.header.request.bodylen= htonl(request.message.header.request.extlen);
 128   request.message.body.expiration= htonl((uint32_t) expiration);
 129
 130   memcached_return_t rc= MEMCACHED_SUCCESS;
 131
 132   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 133   {
 134     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 135
 136     if (ptr->flags.no_reply)
 137     {
 138       request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSHQ;
 139     }
 140     else
 141     {
 142       request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSH;
 143     }
 144
 145     memcached_return_t rrc;
 146     if ((rrc= memcached_do(instance, request.bytes, sizeof(request.bytes), true)))
 147     {
 148       memcached_set_error(*instance, rrc, MEMCACHED_AT);
 149       memcached_io_reset(instance);
 150       rc= MEMCACHED_SOME_ERRORS;
 151     }
 152   }
 153
 154   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 155   {
 156     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 157
 158     if (memcached_server_response_count(instance) > 0)
 159     {
 160       (void)memcached_response(instance, NULL, 0, NULL);
 161     }
 162   }
 163
 164   return rc;
 165 }