forked from TheThingsNetwork/lorawan-stack
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathjavascript.go
More file actions
89 lines (75 loc) · 2.2 KB
/
Copy pathjavascript.go
File metadata and controls
89 lines (75 loc) · 2.2 KB
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
// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 javascript implements a Javascript scripting engine.
package javascript
import (
"context"
"runtime/trace"
"time"
"github.com/robertkrimen/otto"
"go.thethings.network/lorawan-stack/pkg/errors"
"go.thethings.network/lorawan-stack/pkg/scripting"
)
type js struct {
options scripting.Options
}
// New returns a new Javascript scripting engine.
func New(options scripting.Options) scripting.Engine {
return &js{options}
}
var errRuntime = errors.Define("runtime", "runtime error")
// Run executes the Javascript script in the environment env and returns the output.
func (j *js) Run(ctx context.Context, script string, env map[string]interface{}) (val interface{}, err error) {
defer trace.StartRegion(ctx, "run javascript").End()
start := time.Now()
defer func() {
runLatency.Observe(time.Since(start).Seconds())
if err != nil {
runs.WithLabelValues("error").Inc()
} else {
runs.WithLabelValues("ok").Inc()
}
}()
vm := otto.New()
vm.SetStackDepthLimit(j.options.StackDepthLimit)
err = vm.Set("env", env)
if err != nil {
return
}
defer func() {
if caught := recover(); caught != nil {
switch val := caught.(type) {
case error:
err = errRuntime.WithCause(val)
default:
err = errRuntime
}
return
}
}()
vm.Interrupt = make(chan func(), 1)
ctx, cancel := context.WithTimeout(ctx, j.options.Timeout)
defer cancel()
go func() {
<-ctx.Done()
vm.Interrupt <- func() {
panic(context.DeadlineExceeded)
}
}()
output, err := vm.Run(script)
if err != nil {
return nil, errRuntime.WithCause(err)
}
return output.Export()
}