add grpc support

pkg/srv/grpc/grpc.go

@@ -3,27 +3,54 @@ package grpc
 import (
 	"context"
 
-	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"github.com/rs/zerolog"
+	"go.opentelemetry.io/otel/codes"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/trace"
-	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	"google.golang.org/grpc"
 
+	appotel "gitea.libretechconsulting.com/rmcguire/go-app/pkg/otel"
 	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
 )
 
-type AppGRPCServer struct {
-	ctx    context.Context
-	tracer trace.Tracer
-	meter  metric.Meter
+type appGRPCServer struct {
+	ctx        context.Context
+	tracer     trace.Tracer
+	meter      metric.Meter
+	opts       *opts.GRPCOpts
+	serverOpts []grpc.ServerOption
+	logger     *zerolog.Logger
+	server     *grpc.Server
 }
 
-func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) {
-	server := grpc.NewServer()
-
-	stats := otelgrpc.NewServerHandler(otelgrpc.WithTracerProvider(sdktrace.T))
-
-	for _, service := range opts.Services {
-		server.RegisterService(service.Type, service.Service)
+// TODO: This probably needs to pass back an error chan and a shutdown
+// func like the http server does
+func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) error {
+	appGRPC := &appGRPCServer{
+		ctx:        ctx,
+		tracer:     appotel.GetTracer(ctx, "grpc"),
+		meter:      appotel.GetMeter(ctx, "grpc"),
+		opts:       opts,
+		serverOpts: make([]grpc.ServerOption, 0),
+		logger:     zerolog.Ctx(ctx),
 	}
+
+	ctx, span := appGRPC.tracer.Start(ctx, "appgrpc.init")
+	defer span.End()
+
+	if err := appGRPC.prepGRPCServer(ctx); err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, "failed to prepare GRPC Server")
+		return err
+	}
+
+	err := appGRPC.runGRPCServer(ctx)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, "failed to start GRPC Server")
+		return err
+	}
+
+	span.SetStatus(codes.Ok, "")
+	return nil
 }