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[awesomized/libmemcached] / libmemcached / do.cc
1 /* LibMemcached
2 * Copyright (C) 2006-2010 Brian Aker
3 * All rights reserved.
4 *
5 * Use and distribution licensed under the BSD license. See
6 * the COPYING file in the parent directory for full text.
7 *
8 * Summary:
9 *
10 */
11
12 #include <libmemcached/common.h>
13
14 memcached_return_t memcached_vdo(memcached_server_write_instance_st instance,
15 libmemcached_io_vector_st vector[],
16 const size_t count,
17 const bool with_flush)
18 {
19 memcached_return_t rc;
20
21 assert_msg(vector, "Invalid vector passed");
22
23 if (memcached_failed(rc= memcached_connect(instance)))
24 {
25 WATCHPOINT_ERROR(rc);
26 assert_msg(instance->error_messages, "memcached_connect() returned an error but the memcached_server_write_instance_st showed none.");
27 return rc;
28 }
29
30 /*
31 ** Since non buffering ops in UDP mode dont check to make sure they will fit
32 ** before they start writing, if there is any data in buffer, clear it out,
33 ** otherwise we might get a partial write.
34 **/
35 if (memcached_is_udp(instance->root))
36 {
37 if (vector[0].buffer or vector[0].length)
38 {
39 return memcached_set_error(*instance->root, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
40 memcached_literal_param("UDP messages was attempted, but vector was not setup for it"));
41 }
42
43 struct msghdr msg;
44 memset(&msg, 0, sizeof(msg));
45
46 increment_udp_message_id(instance);
47 vector[0].buffer= instance->write_buffer;
48 vector[0].length= UDP_DATAGRAM_HEADER_LENGTH;
49
50 msg.msg_iov= (struct iovec*)vector;
51 msg.msg_iovlen= count;
52
53 uint32_t retry= 5;
54 while (--retry)
55 {
56 ssize_t sendmsg_length= ::sendmsg(instance->fd, &msg, 0);
57 if (sendmsg_length > 0)
58 {
59 break;
60 }
61 else if (sendmsg_length < 0)
62 {
63 if (errno == EMSGSIZE)
64 {
65 return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
66 }
67
68 return memcached_set_errno(*instance, errno, MEMCACHED_AT);
69 }
70 }
71
72 return MEMCACHED_SUCCESS;
73 }
74
75 ssize_t sent_length= memcached_io_writev(instance, vector, count, with_flush);
76 size_t command_length= 0;
77 for (uint32_t x= 0; x < count; ++x, vector++)
78 {
79 command_length+= vector->length;
80 }
81
82 if (sent_length == -1 or size_t(sent_length) != command_length)
83 {
84 if (memcached_last_error(instance->root) == MEMCACHED_SUCCESS)
85 {
86 return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
87 }
88 else
89 {
90 rc= MEMCACHED_WRITE_FAILURE;
91 }
92 }
93 else if (memcached_is_replying(instance->root))
94 {
95 memcached_server_response_increment(instance);
96 }
97
98 return rc;
99 }