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   memcached_return_t ret= MEMCACHED_SUCCESS;
   6   memcached_st *root= (memcached_st *)ptr->root;
   7
   8   if (memcached_is_purging(ptr->root) || /* 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   memcached_set_purging(root, 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, true) == -1)
  25   {
  26     memcached_set_purging(root, true);
  27
  28     return memcached_set_error(*ptr, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  29   }
  30   WATCHPOINT_ASSERT(ptr->fd != -1);
  31
  32   uint32_t no_msg= memcached_server_response_count(ptr) - 1;
  33   if (no_msg > 0)
  34   {
  35     memcached_result_st result;
  36     memcached_result_st *result_ptr;
  37     char buffer[SMALL_STRING_LEN];
  38
  39     /*
  40      * We need to increase the timeout, because we might be waiting for
  41      * data to be sent from the server (the commands was in the output buffer
  42      * and just flushed
  43    */
  44     const int32_t timeo= ptr->root->poll_timeout;
  45     root->poll_timeout= 2000;
  46
  47     result_ptr= memcached_result_create(root, &result);
  48     WATCHPOINT_ASSERT(result_ptr);
  49
  50     for (uint32_t x= 0; x < no_msg; x++)
  51     {
  52       memcached_result_reset(result_ptr);
  53       memcached_return_t rc= memcached_read_one_response(ptr, buffer,
  54                                                          sizeof (buffer),
  55                                                          result_ptr);
  56       /*
  57        * Purge doesn't care for what kind of command results that is received.
  58        * The only kind of errors I care about if is I'm out of sync with the
  59        * protocol or have problems reading data from the network..
  60      */
  61       if (rc== MEMCACHED_PROTOCOL_ERROR || rc == MEMCACHED_UNKNOWN_READ_FAILURE)
  62       {
  63         WATCHPOINT_ERROR(rc);
  64         ret= rc;
  65         memcached_io_reset(ptr);
  66         memcached_set_error(*ptr, rc, MEMCACHED_AT);
  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 }