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

   1 #include "common.h"
   2
   3 memcached_return_t memcached_purge(memcached_server_write_instance_st ptr)
   4 {
   5   uint32_t x;
   6   memcached_return_t ret= MEMCACHED_SUCCESS;
   7   memcached_st *root= (memcached_st *)ptr->root;
   8
   9   if (memcached_is_purging(ptr->root) || /* already purging */
  10       (memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
  11        ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
  12       (ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
  13        memcached_server_response_count(ptr) < 2))
  14   {
  15     return MEMCACHED_SUCCESS;
  16   }
  17
  18   /* memcached_io_write and memcached_response may call memcached_purge
  19     so we need to be able stop any recursion.. */
  20   memcached_set_purging(root, true);
  21
  22   WATCHPOINT_ASSERT(ptr->fd != -1);
  23   /* Force a flush of the buffer to ensure that we don't have the n-1 pending
  24     requests buffered up.. */
  25   if (memcached_io_write(ptr, NULL, 0, true) == -1)
  26   {
  27     memcached_set_purging(root, true);
  28
  29     return MEMCACHED_WRITE_FAILURE;
  30   }
  31   WATCHPOINT_ASSERT(ptr->fd != -1);
  32
  33   uint32_t no_msg= memcached_server_response_count(ptr) - 1;
  34   if (no_msg > 0)
  35   {
  36     memcached_result_st result;
  37     memcached_result_st *result_ptr;
  38     char buffer[SMALL_STRING_LEN];
  39
  40     /*
  41      * We need to increase the timeout, because we might be waiting for
  42      * data to be sent from the server (the commands was in the output buffer
  43      * and just flushed
  44    */
  45     const int32_t timeo= ptr->root->poll_timeout;
  46     root->poll_timeout= 2000;
  47
  48     result_ptr= memcached_result_create(root, &result);
  49     WATCHPOINT_ASSERT(result_ptr);
  50
  51     for (x= 0; x < no_msg; x++)
  52     {
  53       memcached_result_reset(result_ptr);
  54       memcached_return_t rc= memcached_read_one_response(ptr, buffer,
  55                                                          sizeof (buffer),
  56                                                          result_ptr);
  57       /*
  58        * Purge doesn't care for what kind of command results that is received.
  59        * The only kind of errors I care about if is I'm out of sync with the
  60        * protocol or have problems reading data from the network..
  61      */
  62       if (rc== MEMCACHED_PROTOCOL_ERROR || rc == MEMCACHED_UNKNOWN_READ_FAILURE)
  63       {
  64         WATCHPOINT_ERROR(rc);
  65         ret = rc;
  66         memcached_io_reset(ptr);
  67       }
  68
  69       if (ptr->root->callbacks != NULL)
  70       {
  71         memcached_callback_st cb = *ptr->root->callbacks;
  72         if (rc == MEMCACHED_SUCCESS)
  73         {
  74           for (uint32_t y= 0; y < cb.number_of_callback; y++)
  75           {
  76             rc = (*cb.callback[y])(ptr->root, result_ptr, cb.context);
  77             if (rc != MEMCACHED_SUCCESS)
  78               break;
  79           }
  80         }
  81       }
  82     }
  83
  84     memcached_result_free(result_ptr);
  85     root->poll_timeout= timeo;
  86   }
  87   memcached_set_purging(root, false);
  88
  89   return ret;
  90 }