1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "FullyBufferedSocket.hxx"
#include "system/SocketError.hxx"
#include "util/fifo_buffer.h"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include <assert.h>
#include <stdint.h>
#include <string.h>
#ifndef WIN32
#include <sys/types.h>
#include <sys/socket.h>
#endif
FullyBufferedSocket::ssize_t
FullyBufferedSocket::DirectWrite(const void *data, size_t length)
{
const auto nbytes = SocketMonitor::Write((const char *)data, length);
if (gcc_unlikely(nbytes < 0)) {
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
Cancel();
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(NewSocketError(code));
}
return nbytes;
}
bool
FullyBufferedSocket::WriteFromBuffer()
{
assert(IsDefined());
size_t length;
const void *data = output.Read(&length);
if (data == nullptr) {
CancelWrite();
return true;
}
auto nbytes = DirectWrite(data, length);
if (gcc_unlikely(nbytes <= 0))
return nbytes == 0;
output.Consume(nbytes);
if (output.IsEmpty())
CancelWrite();
return true;
}
bool
FullyBufferedSocket::Write(const void *data, size_t length)
{
assert(IsDefined());
#if 0
/* TODO: disabled because this would add overhead on some callers (the ones that often), but it may be useful */
if (output.IsEmpty()) {
/* try to write it directly first */
const auto nbytes = DirectWrite(data, length);
if (gcc_likely(nbytes > 0)) {
data = (const uint8_t *)data + nbytes;
length -= nbytes;
if (length == 0)
return true;
} else if (nbytes < 0)
return false;
}
#endif
if (!output.Append(data, length)) {
// TODO
static constexpr Domain buffered_socket_domain("buffered_socket");
Error error;
error.Set(buffered_socket_domain, "Output buffer is full");
OnSocketError(std::move(error));
return false;
}
ScheduleWrite();
return true;
}
bool
FullyBufferedSocket::OnSocketReady(unsigned flags)
{
const bool was_empty = output.IsEmpty();
if (!BufferedSocket::OnSocketReady(flags))
return false;
if (was_empty && !output.IsEmpty())
/* just in case the OnSocketInput() method has added
data to the output buffer: try to send it now
instead of waiting for the next event loop
iteration */
flags |= WRITE;
if (flags & WRITE) {
assert(!output.IsEmpty());
if (!WriteFromBuffer())
return false;
}
return true;
}
|
