git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/flush.cc

   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
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  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
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  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
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  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
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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     rc= memcached_flush_binary(ptr, expiration);
  55   else
  56     rc= memcached_flush_textual(ptr, expiration);
  57   LIBMEMCACHED_MEMCACHED_FLUSH_END();
  58   return rc;
  59 }
  60
  61 static memcached_return_t memcached_flush_textual(memcached_st *ptr,
  62                                                   time_t expiration)
  63 {
  64   unlikely (memcached_server_count(ptr) == 0)
  65     return MEMCACHED_NO_SERVERS;
  66
  67   for (unsigned int x= 0; x < memcached_server_count(ptr); x++)
  68   {
  69     memcached_return_t rc;
  70     char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  71
  72     bool no_reply= ptr->flags.no_reply;
  73     memcached_server_write_instance_st instance=
  74       memcached_server_instance_fetch(ptr, x);
  75
  76     int send_length;
  77     if (expiration)
  78     {
  79       send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  80                             "flush_all %llu%s\r\n",
  81                             (unsigned long long)expiration, no_reply ? " noreply" : "");
  82     }
  83     else
  84     {
  85       send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  86                             "flush_all%s\r\n", no_reply ? " noreply" : "");
  87     }
  88
  89     if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  90     {
  91       return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  92                                  memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  93     }
  94
  95     rc= memcached_do(instance, buffer, (size_t)send_length, true);
  96
  97     if (rc == MEMCACHED_SUCCESS && !no_reply)
  98       (void)memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  99   }
 100
 101   return MEMCACHED_SUCCESS;
 102 }
 103
 104 static memcached_return_t memcached_flush_binary(memcached_st *ptr,
 105                                                  time_t expiration)
 106 {
 107   protocol_binary_request_flush request= {};
 108
 109   unlikely (memcached_server_count(ptr) == 0)
 110     return MEMCACHED_NO_SERVERS;
 111
 112   request.message.header.request.magic= (uint8_t)PROTOCOL_BINARY_REQ;
 113   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSH;
 114   request.message.header.request.extlen= 4;
 115   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 116   request.message.header.request.bodylen= htonl(request.message.header.request.extlen);
 117   request.message.body.expiration= htonl((uint32_t) expiration);
 118
 119   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 120   {
 121     memcached_server_write_instance_st instance=
 122       memcached_server_instance_fetch(ptr, x);
 123
 124     if (ptr->flags.no_reply)
 125     {
 126       request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSHQ;
 127     }
 128     else
 129     {
 130       request.message.header.request.opcode= PROTOCOL_BINARY_CMD_FLUSH;
 131     }
 132
 133     if (memcached_do(instance, request.bytes, sizeof(request.bytes), true) != MEMCACHED_SUCCESS)
 134     {
 135       memcached_io_reset(instance);
 136       return MEMCACHED_WRITE_FAILURE;
 137     }
 138   }
 139
 140   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 141   {
 142     memcached_server_write_instance_st instance=
 143       memcached_server_instance_fetch(ptr, x);
 144
 145     if (memcached_server_response_count(instance) > 0)
 146       (void)memcached_response(instance, NULL, 0, NULL);
 147   }
 148
 149   return MEMCACHED_SUCCESS;
 150 }