/
tcp_frame_relay.go
79 lines (67 loc) · 2.25 KB
/
tcp_frame_relay.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
// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package benchmark
import (
"log"
"net"
)
import "github.com/uber/tchannel-go"
type tcpFrameRelay struct {
*tcpRelay
modifier func(bool, *tchannel.Frame) *tchannel.Frame
}
// NewTCPFrameRelay relays frames from one connection to another. It reads
// and writes frames using the TChannel frame functions.
func NewTCPFrameRelay(dests []string, modifier func(bool, *tchannel.Frame) *tchannel.Frame) (Relay, error) {
var err error
r := &tcpFrameRelay{modifier: modifier}
r.tcpRelay, err = newTCPRelay(dests, r.handleConnFrameRelay)
if err != nil {
return nil, err
}
return r, nil
}
func (r *tcpFrameRelay) handleConnFrameRelay(fromClient bool, src, dst net.Conn) {
pool := tchannel.NewSyncFramePool()
frameCh := make(chan *tchannel.Frame, 100)
defer close(frameCh)
go func() {
for f := range frameCh {
if err := f.WriteOut(dst); err != nil {
log.Printf("Failed to write out frame: %v", err)
return
}
pool.Release(f)
}
}()
for {
f := pool.Get()
if err := f.ReadIn(src); err != nil {
return
}
if r.modifier != nil {
f = r.modifier(fromClient, f)
}
select {
case frameCh <- f:
default:
panic("frame buffer full")
}
}
}