Updates for CORK.
[m6w6/libmemcached] / 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 }