#include "common.h"
memcached_return_t memcached_purge(memcached_server_write_instance_st ptr)
{
uint32_t x;
memcached_return_t ret= MEMCACHED_SUCCESS;
memcached_st *root= (memcached_st *)ptr->root;
if (memcached_is_purging(ptr->root) || /* already purging */
(memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
(ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
memcached_server_response_count(ptr) < 2))
{
return MEMCACHED_SUCCESS;
}
/* memcached_io_write and memcached_response may call memcached_purge
so we need to be able stop any recursion.. */
memcached_set_purging(root, true);
WATCHPOINT_ASSERT(ptr->fd != -1);
/* Force a flush of the buffer to ensure that we don't have the n-1 pending
requests buffered up.. */
if (memcached_io_write(ptr, NULL, 0, true) == -1)
{
memcached_set_purging(root, true);
return MEMCACHED_WRITE_FAILURE;
}
WATCHPOINT_ASSERT(ptr->fd != -1);
uint32_t no_msg= memcached_server_response_count(ptr) - 1;
if (no_msg > 0)
{
memcached_result_st result;
memcached_result_st *result_ptr;
char buffer[SMALL_STRING_LEN];
/*
* We need to increase the timeout, because we might be waiting for
* data to be sent from the server (the commands was in the output buffer
* and just flushed
*/
const int32_t timeo= ptr->root->poll_timeout;
root->poll_timeout= 2000;
result_ptr= memcached_result_create(root, &result);
WATCHPOINT_ASSERT(result_ptr);
for (x= 0; x < no_msg; x++)
{
memcached_result_reset(result_ptr);
memcached_return_t rc= memcached_read_one_response(ptr, buffer,
sizeof (buffer),
result_ptr);
/*
* Purge doesn't care for what kind of command results that is received.
* The only kind of errors I care about if is I'm out of sync with the
* protocol or have problems reading data from the network..
*/
if (rc== MEMCACHED_PROTOCOL_ERROR || rc == MEMCACHED_UNKNOWN_READ_FAILURE)
{
WATCHPOINT_ERROR(rc);
ret = rc;
memcached_io_reset(ptr);
}
if (ptr->root->callbacks != NULL)
{
memcached_callback_st cb = *ptr->root->callbacks;
if (rc == MEMCACHED_SUCCESS)
{
for (uint32_t y= 0; y < cb.number_of_callback; y++)
{
rc = (*cb.callback[y])(ptr->root, result_ptr, cb.context);
if (rc != MEMCACHED_SUCCESS)
break;
}
}
}
}
memcached_result_free(result_ptr);
root->poll_timeout= timeo;
}
memcached_set_purging(root, false);
return ret;
}