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
|
/*
* Copyright (C) 2003-2014 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 "BufferedSocket.hxx"
#include "system/SocketError.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Compiler.h"
#include <algorithm>
BufferedSocket::ssize_t
BufferedSocket::DirectRead(void *data, size_t length)
{
const auto nbytes = SocketMonitor::Read((char *)data, length);
if (gcc_likely(nbytes > 0))
return nbytes;
if (nbytes == 0) {
OnSocketClosed();
return -1;
}
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(NewSocketError(code));
return -1;
}
bool
BufferedSocket::ReadToBuffer()
{
assert(IsDefined());
const auto buffer = input.Write();
assert(!buffer.IsEmpty());
const auto nbytes = DirectRead(buffer.data, buffer.size);
if (nbytes > 0)
input.Append(nbytes);
return nbytes >= 0;
}
bool
BufferedSocket::ResumeInput()
{
assert(IsDefined());
while (true) {
const auto buffer = input.Read();
if (buffer.IsEmpty()) {
ScheduleRead();
return true;
}
const auto result = OnSocketInput(buffer.data, buffer.size);
switch (result) {
case InputResult::MORE:
if (input.IsFull()) {
// TODO
static constexpr Domain buffered_socket_domain("buffered_socket");
Error error;
error.Set(buffered_socket_domain,
"Input buffer is full");
OnSocketError(std::move(error));
return false;
}
ScheduleRead();
return true;
case InputResult::PAUSE:
CancelRead();
return true;
case InputResult::AGAIN:
continue;
case InputResult::CLOSED:
return false;
}
}
}
bool
BufferedSocket::OnSocketReady(unsigned flags)
{
assert(IsDefined());
if (gcc_unlikely(flags & (ERROR|HANGUP))) {
OnSocketClosed();
return false;
}
if (flags & READ) {
assert(!input.IsFull());
if (!ReadToBuffer())
return false;
if (!ResumeInput())
/* we must return "true" here or
SocketMonitor::Dispatch() will call
Cancel() on a freed object */
return true;
if (!input.IsFull())
ScheduleRead();
}
return true;
}
|
