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package main
import (
crand "crypto/rand"
"encoding/binary"
"flag"
"fmt"
"io"
"log"
"math/rand"
"os"
"runtime/debug"
"runtime/pprof"
"time"
"github.com/dop251/goja"
"github.com/dop251/goja_nodejs/console"
"github.com/dop251/goja_nodejs/require"
)
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
var timelimit = flag.Int("timelimit", 0, "max time to run (in seconds)")
func readSource(filename string) ([]byte, error) {
if filename == "" || filename == "-" {
return io.ReadAll(os.Stdin)
}
return os.ReadFile(filename)
}
func load(vm *goja.Runtime, call goja.FunctionCall) goja.Value {
p := call.Argument(0).String()
b, err := readSource(p)
if err != nil {
panic(vm.ToValue(fmt.Sprintf("Could not read %s: %v", p, err)))
}
v, err := vm.RunScript(p, string(b))
if err != nil {
panic(err)
}
return v
}
func newRandSource() goja.RandSource {
var seed int64
if err := binary.Read(crand.Reader, binary.LittleEndian, &seed); err != nil {
panic(fmt.Errorf("Could not read random bytes: %v", err))
}
return rand.New(rand.NewSource(seed)).Float64
}
func run() error {
filename := flag.Arg(0)
src, err := readSource(filename)
if err != nil {
return err
}
if filename == "" || filename == "-" {
filename = "<stdin>"
}
vm := goja.New()
vm.SetRandSource(newRandSource())
new(require.Registry).Enable(vm)
console.Enable(vm)
vm.Set("load", func(call goja.FunctionCall) goja.Value {
return load(vm, call)
})
vm.Set("readFile", func(name string) (string, error) {
b, err := os.ReadFile(name)
if err != nil {
return "", err
}
return string(b), nil
})
if *timelimit > 0 {
time.AfterFunc(time.Duration(*timelimit)*time.Second, func() {
vm.Interrupt("timeout")
})
}
//log.Println("Compiling...")
prg, err := goja.Compile(filename, string(src), false)
if err != nil {
return err
}
//log.Println("Running...")
_, err = vm.RunProgram(prg)
//log.Println("Finished.")
return err
}
func main() {
defer func() {
if x := recover(); x != nil {
debug.Stack()
panic(x)
}
}()
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if err := run(); err != nil {
//fmt.Printf("err type: %T\n", err)
switch err := err.(type) {
case *goja.Exception:
fmt.Println(err.String())
case *goja.InterruptedError:
fmt.Println(err.String())
default:
fmt.Println(err)
}
os.Exit(64)
}
}
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