implement grpc gateway and addl handler support

pkg/app/run_grpc.go

@@ -0,0 +1,35 @@
+package app
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+)
+
+func (a *App) runGRPC(ctx context.Context) {
+	span := trace.SpanFromContext(ctx)
+	if err := a.initGRPC(ctx); err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+	span.AddEvent("grpc server started")
+	span.SetAttributes(attribute.Int("grpc.services", len(a.GRPC.Services)))
+
+	if a.GRPC.GetGatewayMux() != nil {
+		if a.HTTP.Handlers == nil {
+			a.HTTP.Handlers = make([]opts.HTTPHandler, 0, 1)
+		}
+
+		a.HTTP.Handlers = append(a.HTTP.Handlers, opts.HTTPHandler{
+			Prefix:      GRPC_GW_API_PATH,
+			StripPrefix: true,
+			Handler:     a.GRPC.GetGatewayMux(),
+		})
+
+		span.AddEvent("GRPC Gateway Mux Registered")
+	}
+}