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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
package rpcplugin
import (
"bufio"
"bytes"
"encoding/binary"
"io"
"sync"
)
type asyncRead struct {
b []byte
err error
}
type asyncReadCloser struct {
io.ReadCloser
buffer bytes.Buffer
read chan struct{}
reads chan asyncRead
close chan struct{}
closeOnce sync.Once
}
// NewAsyncReadCloser returns a ReadCloser that supports Close during Read.
func NewAsyncReadCloser(r io.ReadCloser) io.ReadCloser {
ret := &asyncReadCloser{
ReadCloser: r,
read: make(chan struct{}),
reads: make(chan asyncRead),
close: make(chan struct{}),
}
go ret.loop()
return ret
}
func (r *asyncReadCloser) loop() {
buf := make([]byte, 1024*8)
var n int
var err error
for {
select {
case <-r.read:
n = 0
if err == nil {
n, err = r.ReadCloser.Read(buf)
}
select {
case r.reads <- asyncRead{buf[:n], err}:
case <-r.close:
}
case <-r.close:
r.ReadCloser.Close()
return
}
}
}
func (r *asyncReadCloser) Read(b []byte) (int, error) {
if r.buffer.Len() > 0 {
return r.buffer.Read(b)
}
select {
case r.read <- struct{}{}:
case <-r.close:
}
select {
case read := <-r.reads:
if read.err != nil {
return 0, read.err
}
n := copy(b, read.b)
if n < len(read.b) {
r.buffer.Write(read.b[n:])
}
return n, nil
case <-r.close:
return 0, io.EOF
}
}
func (r *asyncReadCloser) Close() error {
r.closeOnce.Do(func() {
close(r.close)
})
return nil
}
type asyncWrite struct {
n int
err error
}
type asyncWriteCloser struct {
io.WriteCloser
writeBuffer bytes.Buffer
write chan struct{}
writes chan asyncWrite
close chan struct{}
closeOnce sync.Once
}
// NewAsyncWriteCloser returns a WriteCloser that supports Close during Write.
func NewAsyncWriteCloser(w io.WriteCloser) io.WriteCloser {
ret := &asyncWriteCloser{
WriteCloser: w,
write: make(chan struct{}),
writes: make(chan asyncWrite),
close: make(chan struct{}),
}
go ret.loop()
return ret
}
func (w *asyncWriteCloser) loop() {
var n int64
var err error
for {
select {
case <-w.write:
n = 0
if err == nil {
n, err = w.writeBuffer.WriteTo(w.WriteCloser)
}
select {
case w.writes <- asyncWrite{int(n), err}:
case <-w.close:
}
case <-w.close:
w.WriteCloser.Close()
return
}
}
}
func (w *asyncWriteCloser) Write(b []byte) (int, error) {
if n, err := w.writeBuffer.Write(b); err != nil {
return n, err
}
select {
case w.write <- struct{}{}:
case <-w.close:
}
select {
case write := <-w.writes:
return write.n, write.err
case <-w.close:
return 0, io.EOF
}
}
func (w *asyncWriteCloser) Close() error {
w.closeOnce.Do(func() {
close(w.close)
})
return nil
}
type rwc struct {
io.ReadCloser
io.WriteCloser
}
func (rwc *rwc) Close() (err error) {
err = rwc.WriteCloser.Close()
if rerr := rwc.ReadCloser.Close(); err == nil {
err = rerr
}
return
}
func NewReadWriteCloser(r io.ReadCloser, w io.WriteCloser) io.ReadWriteCloser {
return &rwc{r, w}
}
type RemoteIOReader struct {
conn io.ReadWriteCloser
}
func (r *RemoteIOReader) Read(b []byte) (int, error) {
var buf [10]byte
n := binary.PutVarint(buf[:], int64(len(b)))
if _, err := r.conn.Write(buf[:n]); err != nil {
return 0, err
}
return r.conn.Read(b)
}
func (r *RemoteIOReader) Close() error {
return r.conn.Close()
}
func ConnectIOReader(conn io.ReadWriteCloser) io.ReadCloser {
return &RemoteIOReader{conn}
}
func ServeIOReader(r io.Reader, conn io.ReadWriteCloser) {
cr := bufio.NewReader(conn)
defer conn.Close()
buf := make([]byte, 32*1024)
for {
n, err := binary.ReadVarint(cr)
if err != nil {
break
}
if written, err := io.CopyBuffer(conn, io.LimitReader(r, n), buf); err != nil || written < n {
break
}
}
}
|
