add tracing and refactor some api pkgs

internal/api/grpc/server/server.go

@@ -0,0 +1,53 @@
+package server
+
+import (
+	"context"
+	"net"
+
+	"github.com/caos/logging"
+	"google.golang.org/grpc"
+
+	"github.com/caos/zitadel/internal/api/http"
+)
+
+const (
+	defaultGrpcPort = "80"
+)
+
+type Server interface {
+	GRPCPort() string
+	GRPCServer() (*grpc.Server, error)
+}
+
+func StartServer(ctx context.Context, s Server) {
+	port := grpcPort(s.GRPCPort())
+	listener := http.CreateListener(port)
+	server := createGrpcServer(s)
+	serveServer(ctx, server, listener, port)
+}
+
+func createGrpcServer(s Server) *grpc.Server {
+	grpcServer, err := s.GRPCServer()
+	logging.Log("SERVE-k280HZ").OnError(err).Panic("failed to create grpc server")
+	return grpcServer
+}
+
+func serveServer(ctx context.Context, server *grpc.Server, listener net.Listener, port string) {
+	go func() {
+		<-ctx.Done()
+		server.GracefulStop()
+	}()
+
+	go func() {
+		err := server.Serve(listener)
+		logging.Log("SERVE-Ga3e94").OnError(err).Panic("grpc server serve failed")
+	}()
+	logging.LogWithFields("SERVE-bZ44QM", "port", port).Info("grpc server is listening")
+}
+
+func grpcPort(port string) string {
+	if port == "" {
+		return defaultGrpcPort
+	}
+	return port
+}