/
framed_transport.go
151 lines (134 loc) · 4.29 KB
/
framed_transport.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
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package thrift
import (
"bufio"
"bytes"
"encoding/binary"
"fmt"
"io"
)
const DEFAULT_MAX_LENGTH = 16384000
type FramedTransport struct {
transport Transport
framebuf byteReader // buffer for reading complete frames off the wire
buf bytes.Buffer // buffers the writes
reader *bufio.Reader // just a buffer over the underlying transport
frameSize uint32 // Current remaining size of the frame. if ==0 read next frame header
rBuffer [4]byte // used for reading
wBuffer [4]byte // used for writing
maxLength uint32
}
func NewFramedTransport(transport Transport) *FramedTransport {
return &FramedTransport{transport: transport, reader: bufio.NewReader(transport), maxLength: DEFAULT_MAX_LENGTH}
}
func NewFramedTransportMaxLength(transport Transport, maxLength uint32) *FramedTransport {
return &FramedTransport{transport: transport, reader: bufio.NewReader(transport), maxLength: maxLength}
}
func (p *FramedTransport) Close() error {
return p.transport.Close()
}
func (p *FramedTransport) Read(buf []byte) (l int, err error) {
if p.frameSize == 0 {
p.frameSize, err = p.readFrameHeader()
if err != nil {
return
}
}
if p.frameSize < uint32(len(buf)) {
frameSize := p.frameSize
tmp := make([]byte, p.frameSize)
l, err = p.Read(tmp)
copy(buf, tmp)
if err == nil {
err = NewTransportExceptionFromError(fmt.Errorf("Not enough frame size %d to read %d bytes", frameSize, len(buf)))
return
}
}
got, err := p.framebuf.Read(buf)
p.frameSize = p.frameSize - uint32(got)
//sanity check
if p.frameSize < 0 {
return 0, NewTransportException(UNKNOWN_TRANSPORT_EXCEPTION, "Negative frame size")
}
return got, NewTransportExceptionFromError(err)
}
func (p *FramedTransport) ReadByte() (c byte, err error) {
if p.frameSize == 0 {
p.frameSize, err = p.readFrameHeader()
if err != nil {
return
}
}
if p.frameSize < 1 {
return 0, NewTransportExceptionFromError(fmt.Errorf("Not enough frame size %d to read %d bytes", p.frameSize, 1))
}
c, err = p.framebuf.ReadByte()
if err == nil {
p.frameSize--
}
return
}
func (p *FramedTransport) Write(buf []byte) (int, error) {
n, err := p.buf.Write(buf)
return n, NewTransportExceptionFromError(err)
}
func (p *FramedTransport) WriteByte(c byte) error {
return p.buf.WriteByte(c)
}
func (p *FramedTransport) WriteString(s string) (n int, err error) {
return p.buf.WriteString(s)
}
func (p *FramedTransport) Flush() error {
size := p.buf.Len()
buf := p.wBuffer[:4]
binary.BigEndian.PutUint32(buf, uint32(size))
_, err := p.transport.Write(buf)
if err != nil {
return NewTransportExceptionFromError(err)
}
if size > 0 {
if n, err := p.buf.WriteTo(p.transport); err != nil {
print("Error while flushing write buffer of size ", size, " to transport, only wrote ", n, " bytes: ", err.Error(), "\n")
return NewTransportExceptionFromError(err)
}
}
err = p.transport.Flush()
return NewTransportExceptionFromError(err)
}
func (p *FramedTransport) readFrameHeader() (uint32, error) {
buf := p.rBuffer[:4]
if _, err := io.ReadFull(p.reader, buf); err != nil {
return 0, err
}
size := binary.BigEndian.Uint32(buf)
if size < 0 || size > p.maxLength {
return 0, NewTransportException(UNKNOWN_TRANSPORT_EXCEPTION, fmt.Sprintf("Incorrect frame size (%d)", size))
}
framebuf := newLimitedByteReader(p.reader, int64(size))
out, err := io.ReadAll(framebuf)
if err != nil {
return 0, err
}
if uint32(len(out)) < size {
return 0, NewTransportExceptionFromError(fmt.Errorf("Unable to read full frame of size %d", size))
}
p.framebuf = newLimitedByteReader(bytes.NewBuffer(out), int64(size))
return size, nil
}
func (p *FramedTransport) RemainingBytes() (num_bytes uint64) {
return uint64(p.frameSize)
}