add grpc support

pkg/app/run.go

@@ -5,6 +5,7 @@ import (
 	"sync"
 	"time"
 
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
 )
 
@@ -16,12 +17,14 @@ func (a *App) run() {
 	case <-a.AppContext.Done():
 		a.l.Warn().Str("reason", a.AppContext.Err().Error()).
 			Msg("shutting down on context done")
-	case <-a.HTTP.httpDone:
+	case <-a.HTTP.HTTPDone: // TODO: return error on this channel
 		a.l.Warn().Msg("shutting down early on http server done")
+	case err := <-a.GRPC.GRPCDone:
+		a.l.Warn().Err(err).Msg("shutting down early on grpc server done")
 	}
-	a.Shutdown()
 
-	a.appDone <- nil
+	a.Shutdown()     // Run through all shutdown funcs
+	a.appDone <- nil // Notify app
 }
 
 // Typically invoked when AppContext is done
@@ -48,6 +51,8 @@ func (a *App) Shutdown() {
 	doneCtx, span := a.tracer.Start(doneCtx, "shutdown")
 	defer span.End()
 
+	span.SetAttributes(attribute.Int("shutdown.funcs", len(a.shutdownFuncs)))
+
 	var wg sync.WaitGroup
 	wg.Add(len(a.shutdownFuncs))