forked from juneym/gor
-
Notifications
You must be signed in to change notification settings - Fork 0
/
middleware.go
143 lines (117 loc) · 2.57 KB
/
middleware.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
package main
import (
"bufio"
"context"
"encoding/hex"
"fmt"
"io"
"log"
"os"
"os/exec"
"strings"
)
// Middleware represents a middleware object
type Middleware struct {
command string
data chan *Message
Stdin io.Writer
Stdout io.Reader
commandCancel context.CancelFunc
stop chan bool // Channel used only to indicate goroutine should shutdown
}
// NewMiddleware returns new middleware
func NewMiddleware(command string) *Middleware {
m := new(Middleware)
m.command = command
m.data = make(chan *Message, 1000)
m.stop = make(chan bool)
commands := strings.Split(command, " ")
ctx, cancl := context.WithCancel(context.Background())
m.commandCancel = cancl
cmd := exec.CommandContext(ctx, commands[0], commands[1:]...)
m.Stdout, _ = cmd.StdoutPipe()
m.Stdin, _ = cmd.StdinPipe()
cmd.Stderr = os.Stderr
go m.read(m.Stdout)
go func() {
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
err = cmd.Wait()
if err != nil {
log.Fatal(err)
}
}()
return m
}
// ReadFrom start a worker to read from this plugin
func (m *Middleware) ReadFrom(plugin PluginReader) {
Debug(2, "[MIDDLEWARE-MASTER] Starting reading from", plugin)
go m.copy(m.Stdin, plugin)
}
func (m *Middleware) copy(to io.Writer, from PluginReader) {
var buf, dst []byte
for {
msg, err := from.PluginRead()
if err != nil {
return
}
if msg == nil || len(msg.Data) == 0 {
continue
}
buf = msg.Data
if Settings.PrettifyHTTP {
buf = prettifyHTTP(msg.Data)
}
dst = make([]byte, len(buf)*2+1)
hex.Encode(dst, buf)
dst[len(buf)*2] = '\n'
to.Write(dst)
}
}
func (m *Middleware) read(from io.Reader) {
reader := bufio.NewReader(from)
var line []byte
var e error
for {
if line, e = reader.ReadBytes('\n'); e != nil {
if e == io.EOF {
continue
} else {
break
}
}
buf := make([]byte, len(line)/2-1)
if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
Debug(0, fmt.Sprintf("[MIDDLEWARE] failed to decode err: %q", err))
continue
}
var msg Message
msg.Meta, msg.Data = payloadMetaWithBody(buf)
select {
case <-m.stop:
return
case m.data <- &msg:
}
}
return
}
// PluginRead reads message from this plugin
func (m *Middleware) PluginRead() (msg *Message, err error) {
select {
case <-m.stop:
return nil, ErrorStopped
case msg = <-m.data:
}
return
}
func (m *Middleware) String() string {
return fmt.Sprintf("Modifying traffic using %q command", m.command)
}
// Close closes this plugin
func (m *Middleware) Close() error {
m.commandCancel()
close(m.stop)
return nil
}