feat(server): handle panic in runtime

ref #2

pkg/app/server.go

@@ -1,15 +1,20 @@
 package app
 
 import (
+	"context"
 	"math/rand"
 	"sync"
 
 	"github.com/dop251/goja"
 	"github.com/dop251/goja_nodejs/eventloop"
 	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
 )
 
-var ErrFuncDoesNotExist = errors.New("function does not exist")
+var (
+	ErrFuncDoesNotExist = errors.New("function does not exist")
+	ErUnknownError      = errors.New("unknown error")
+)
 
 type Server struct {
 	runtime *goja.Runtime
@@ -26,16 +31,18 @@ func (s *Server) Load(name string, src string) error {
 	return nil
 }
 
-func (s *Server) ExecFuncByName(funcName string, args ...interface{}) (goja.Value, error) {
+func (s *Server) ExecFuncByName(ctx context.Context, funcName string, args ...interface{}) (goja.Value, error) {
+	ctx = logger.With(ctx, logger.F("function", funcName), logger.F("args", args))
+
 	callable, ok := goja.AssertFunction(s.runtime.Get(funcName))
 	if !ok {
 		return nil, errors.WithStack(ErrFuncDoesNotExist)
 	}
 
-	return s.Exec(callable, args...)
+	return s.Exec(ctx, callable, args...)
 }
 
-func (s *Server) Exec(callable goja.Callable, args ...interface{}) (goja.Value, error) {
+func (s *Server) Exec(ctx context.Context, callable goja.Callable, args ...interface{}) (goja.Value, error) {
 	var (
 		wg    sync.WaitGroup
 		value goja.Value
@@ -45,6 +52,25 @@ func (s *Server) Exec(callable goja.Callable, args ...interface{}) (goja.Value,
 	wg.Add(1)
 
 	s.loop.RunOnLoop(func(vm *goja.Runtime) {
+		logger.Debug(ctx, "executing callable")
+
+		defer wg.Done()
+
+		defer func() {
+			if recovered := recover(); recovered != nil {
+				revoveredErr, ok := recovered.(error)
+				if ok {
+					logger.Error(ctx, "recovered runtime error", logger.E(errors.WithStack(revoveredErr)))
+
+					err = errors.WithStack(ErUnknownError)
+
+					return
+				}
+
+				panic(recovered)
+			}
+		}()
+
 		jsArgs := make([]goja.Value, 0, len(args))
 		for _, a := range args {
 			jsArgs = append(jsArgs, vm.ToValue(a))
@@ -54,8 +80,6 @@ func (s *Server) Exec(callable goja.Callable, args ...interface{}) (goja.Value,
 		if err != nil {
 			err = errors.WithStack(err)
 		}
-
-		wg.Done()
 	})
 
 	wg.Wait()