start implementing gw serve mux support

pkg/srv/grpc/run.go

@@ -0,0 +1,67 @@
+package grpc
+
+import (
+	"context"
+	"net"
+
+	"go.opentelemetry.io/otel/codes"
+	semconv "go.opentelemetry.io/otel/semconv/v1.27.0"
+)
+
+// TODO: Implement
+func (a *appGRPCServer) runGRPCServer(spanCtx context.Context) error {
+	_, span := a.tracer.Start(spanCtx, "appgrpc.init.start")
+	defer span.End()
+
+	span.SetAttributes(
+		semconv.RPCSystemGRPC,
+		semconv.NetworkProtocolName("grpc"),
+		semconv.ServerAddress(a.opts.Listen),
+	)
+
+	a.shutdownFunc = a.getShutdownFunc()
+
+	l, err := net.Listen("tcp", a.opts.Listen)
+	if err != nil {
+		a.logger.Err(err).Send()
+		span.RecordError(err)
+		span.SetStatus(codes.Error, "failed to acquire net listener")
+		return err
+	}
+
+	span.AddEvent("network listener acquired")
+
+	// Launch GRPC Server
+	go func() {
+		if err := a.server.Serve(l); err != nil {
+			a.logger.Err(err).Send()
+			a.doneChan <- err
+		}
+	}()
+
+	span.AddEvent("grpc server goroutine launched")
+	span.SetStatus(codes.Ok, "")
+
+	return nil
+}
+
+func (a *appGRPCServer) getShutdownFunc() func(context.Context) error {
+	return func(ctx context.Context) error {
+		stoppedChan := make(chan any)
+
+		go func() {
+			a.server.GracefulStop()
+			stoppedChan <- nil
+		}()
+
+		select {
+		case <-stoppedChan:
+			a.logger.Warn().Msg("GRPC server shut down gracefully")
+			return nil
+		case <-ctx.Done():
+			a.logger.Warn().Msg("GRPC server shut down hard")
+			a.server.Stop()
+			return ctx.Err()
+		}
+	}
+}