Golang GRPC：如何从紧急状态恢复GRPC服务器？

Question

I have a handler like this:

func (daemon *Daemon) List(item string) (map[string][]string, error) {
      panic("this is a panic")
      ...

I just want to recover this potential panic, so in my grpc server I wrote:

// Serve serves gRPC request by goroutines
func (s *ServerRPC) Serve(addr string) error {
    defer func() {
        if err := recover(); err != nil {
            glog.Errorf("Recovered from err: ", err)
        }
    }()

    l, err := net.Listen("tcp", addr)
    if err != nil {
        glog.Fatalf("Failed to listen %s: %v", addr, err)
        return err
    }

    return s.server.Serve(l)
}

But it does not capture the panic, I thought it was because my panic happened in child goroutines? If so, how can I recover my grpc server from crashing properly?

Answer 1

panicInterceptor := func (ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
    defer func() {
        if err := recover(); err != nil {
            sentry.CaptureException(fmt.Errorf("%v", err))
        }
    }()

    return handler(ctx, req)
}