/
script.go
170 lines (134 loc) · 2.67 KB
/
script.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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
package common
import (
"github.com/dop251/goja"
req "github.com/dop251/goja_nodejs/require"
"github.com/robertkrimen/otto"
"strings"
"time"
)
type ScriptEngine interface {
Run(time.Duration) (string, error)
}
type ottoEngine struct {
ScriptEngine
engine *otto.Otto
code *otto.Script
}
func NewOttoEngine(src string) (ScriptEngine, error) {
vm := otto.New()
vm.Set("__log__", func(call otto.FunctionCall) otto.Value {
sb := strings.Builder{}
for _, v := range call.ArgumentList {
if sb.Len() > 0 {
sb.WriteString(" ")
}
sb.WriteString(v.String())
}
Debug(sb.String())
return otto.Value{}
})
prog, err := vm.Compile("", "console.log = __log__;"+src)
if Error(err) {
return nil, err
}
engine := &ottoEngine{
engine: vm,
code: prog,
}
return engine, nil
}
func (engine *ottoEngine) Run(timeout time.Duration) (result string, err error) {
timeoutErr := &ErrTimeout{
Duration: timeout,
}
defer func() {
if caught := recover(); caught != nil {
if caught == timeoutErr {
err = timeoutErr
return
}
}
}()
engine.engine.Interrupt = make(chan func(), 1)
watchdogCleanup := make(chan struct{})
defer close(watchdogCleanup)
go func() {
select {
case <-time.After(timeout):
engine.engine.Interrupt <- func() {
panic(timeoutErr)
}
case <-watchdogCleanup:
}
close(engine.engine.Interrupt)
}()
value, err := engine.engine.Run(engine.code)
if Error(err) {
return "", err
}
result, err = value.ToString()
if Error(err) {
return "", err
}
return result, nil
}
type gojaEngine struct {
ScriptEngine
engine *goja.Runtime
code *goja.Program
}
type console struct{}
func (c *console) log(msg string) {
Debug(msg)
}
func newConsole(vm *goja.Runtime) *goja.Object {
c := &console{}
obj := vm.NewObject()
obj.Set("log", c.log)
return obj
}
func NewGojaEngine(src string) (ScriptEngine, error) {
vm := goja.New()
vm.Set("console", newConsole(vm))
new(req.Registry).Enable(vm)
prog, err := goja.Compile("", src, true)
if Error(err) {
return nil, err
}
engine := &gojaEngine{
engine: vm,
code: prog,
}
return engine, nil
}
func (engine *gojaEngine) Run(timeout time.Duration) (string, error) {
type result struct {
value string
err error
}
ch := make(chan result)
go func() {
value, err := engine.engine.RunProgram(engine.code)
if err != nil {
ch <- result{
value: "",
err: err,
}
return
}
ch <- result{
value: value.String(),
err: nil,
}
}()
select {
case <-time.After(timeout):
engine.engine.Interrupt(nil)
return "", &ErrTimeout{
Duration: timeout,
Err: nil,
}
case result := <-ch:
return result.value, result.err
}
}