-
Notifications
You must be signed in to change notification settings - Fork 0
/
conn.go
154 lines (134 loc) · 3.01 KB
/
conn.go
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
package deadline
import (
"net"
"os"
"time"
"github.com/kelleygo/clashcore/common/atomic"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
"github.com/sagernet/sing/common/network"
)
type connReadResult struct {
buffer []byte
err error
}
type Conn struct {
network.ExtendedConn
deadline atomic.TypedValue[time.Time]
pipeDeadline pipeDeadline
disablePipe atomic.Bool
inRead atomic.Bool
resultCh chan *connReadResult
}
func IsConn(conn any) bool {
_, ok := conn.(*Conn)
return ok
}
func NewConn(conn net.Conn) *Conn {
c := &Conn{
ExtendedConn: bufio.NewExtendedConn(conn),
pipeDeadline: makePipeDeadline(),
resultCh: make(chan *connReadResult, 1),
}
c.resultCh <- nil
return c
}
func (c *Conn) Read(p []byte) (n int, err error) {
select {
case result := <-c.resultCh:
if result != nil {
n = copy(p, result.buffer)
err = result.err
if n >= len(result.buffer) {
c.resultCh <- nil // finish cache read
} else {
result.buffer = result.buffer[n:]
c.resultCh <- result // push back for next call
}
return
} else {
c.resultCh <- nil
break
}
case <-c.pipeDeadline.wait():
return 0, os.ErrDeadlineExceeded
}
if c.disablePipe.Load() {
return c.ExtendedConn.Read(p)
} else if c.deadline.Load().IsZero() {
c.inRead.Store(true)
defer c.inRead.Store(false)
return c.ExtendedConn.Read(p)
}
<-c.resultCh
go c.pipeRead(len(p))
return c.Read(p)
}
func (c *Conn) pipeRead(size int) {
buffer := make([]byte, size)
n, err := c.ExtendedConn.Read(buffer)
buffer = buffer[:n]
c.resultCh <- &connReadResult{
buffer: buffer,
err: err,
}
}
func (c *Conn) ReadBuffer(buffer *buf.Buffer) (err error) {
select {
case result := <-c.resultCh:
if result != nil {
n, _ := buffer.Write(result.buffer)
err = result.err
if n >= len(result.buffer) {
c.resultCh <- nil // finish cache read
} else {
result.buffer = result.buffer[n:]
c.resultCh <- result // push back for next call
}
return
} else {
c.resultCh <- nil
break
}
case <-c.pipeDeadline.wait():
return os.ErrDeadlineExceeded
}
if c.disablePipe.Load() {
return c.ExtendedConn.ReadBuffer(buffer)
} else if c.deadline.Load().IsZero() {
c.inRead.Store(true)
defer c.inRead.Store(false)
return c.ExtendedConn.ReadBuffer(buffer)
}
<-c.resultCh
go c.pipeRead(buffer.FreeLen())
return c.ReadBuffer(buffer)
}
func (c *Conn) SetReadDeadline(t time.Time) error {
if c.disablePipe.Load() {
return c.ExtendedConn.SetReadDeadline(t)
} else if c.inRead.Load() {
c.disablePipe.Store(true)
return c.ExtendedConn.SetReadDeadline(t)
}
c.deadline.Store(t)
c.pipeDeadline.set(t)
return nil
}
func (c *Conn) ReaderReplaceable() bool {
select {
case result := <-c.resultCh:
c.resultCh <- result
if result != nil {
return false // cache reading
} else {
break
}
default:
return false // pipe reading
}
return c.disablePipe.Load() || c.deadline.Load().IsZero()
}
func (c *Conn) Upstream() any {
return c.ExtendedConn
}