git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/purge.c

   1 #include "common.h"
   2
   3 memcached_return_t memcached_purge(memcached_server_instance_st *ptr)
   4 {
   5   uint32_t x;
   6   memcached_return_t ret= MEMCACHED_SUCCESS;
   7
   8   if (ptr->root->options.is_purging || /* already purging */
   9       (memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
  10        ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
  11       (ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
  12        memcached_server_response_count(ptr) < 2))
  13   {
  14     return MEMCACHED_SUCCESS;
  15   }
  16
  17   /* memcached_io_write and memcached_response may call memcached_purge
  18     so we need to be able stop any recursion.. */
  19   ptr->root->options.is_purging= true;
  20
  21   WATCHPOINT_ASSERT(ptr->fd != -1);
  22   /* Force a flush of the buffer to ensure that we don't have the n-1 pending
  23     requests buffered up.. */
  24   if (memcached_io_write(ptr, NULL, 0, 1) == -1)
  25   {
  26     ptr->root->options.is_purging= true;
  27     return MEMCACHED_WRITE_FAILURE;
  28   }
  29   WATCHPOINT_ASSERT(ptr->fd != -1);
  30
  31   uint32_t no_msg= memcached_server_response_count(ptr) - 1;
  32   if (no_msg > 0)
  33   {
  34     memcached_result_st result;
  35     memcached_result_st *result_ptr;
  36     char buffer[SMALL_STRING_LEN];
  37
  38     /*
  39      * We need to increase the timeout, because we might be waiting for
  40      * data to be sent from the server (the commands was in the output buffer
  41      * and just flushed
  42    */
  43     int32_t timeo= ptr->root->poll_timeout;
  44     ptr->root->poll_timeout= 2000;
  45
  46     result_ptr= memcached_result_create(ptr->root, &result);
  47     WATCHPOINT_ASSERT(result_ptr);
  48
  49     for (x= 0; x < no_msg; x++)
  50     {
  51       memcached_result_reset(result_ptr);
  52       memcached_return_t rc= memcached_read_one_response(ptr, buffer,
  53                                                          sizeof (buffer),
  54                                                          result_ptr);
  55       /*
  56        * Purge doesn't care for what kind of command results that is received.
  57        * The only kind of errors I care about if is I'm out of sync with the
  58        * protocol or have problems reading data from the network..
  59      */
  60       if (rc== MEMCACHED_PROTOCOL_ERROR || rc == MEMCACHED_UNKNOWN_READ_FAILURE)
  61       {
  62         WATCHPOINT_ERROR(rc);
  63         ret = rc;
  64         memcached_io_reset(ptr);
  65       }
  66
  67       if (ptr->root->callbacks != NULL)
  68       {
  69         memcached_callback_st cb = *ptr->root->callbacks;
  70         if (rc == MEMCACHED_SUCCESS)
  71         {
  72           for (uint32_t y= 0; y < cb.number_of_callback; y++)
  73           {
  74             rc = (*cb.callback[y])(ptr->root, result_ptr, cb.context);
  75             if (rc != MEMCACHED_SUCCESS)
  76               break;
  77           }
  78         }
  79       }
  80     }
  81
  82     memcached_result_free(result_ptr);
  83     ptr->root->poll_timeout= timeo;
  84   }
  85   ptr->root->options.is_purging= false;
  86
  87   return ret;
  88 }