add grpc support

pkg/srv/grpc/grpc.go

@@ -2,8 +2,10 @@ package grpc
 
 import (
 	"context"
+	"strings"
 
 	"github.com/rs/zerolog"
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/trace"
@@ -38,12 +40,18 @@ func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) error {
 	ctx, span := appGRPC.tracer.Start(ctx, "appgrpc.init")
 	defer span.End()
 
+	// Prepare grpc.Server for use
 	if err := appGRPC.prepGRPCServer(ctx); err != nil {
 		span.RecordError(err)
 		span.SetStatus(codes.Error, "failed to prepare GRPC Server")
 		return err
 	}
 
+	// Load span with server info
+	span.SetAttributes(appGRPC.getServerAttributes()...)
+
+	// Run, returning a shutdown func and an error chan
+	// TODO: Implement shutdown func and error chan
 	err := appGRPC.runGRPCServer(ctx)
 	if err != nil {
 		span.RecordError(err)
@@ -54,3 +62,31 @@ func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) error {
 	span.SetStatus(codes.Ok, "")
 	return nil
 }
+
+// Convert grpc.ServiceInfo map to []attribute.KeyValue
+func (a *appGRPCServer) getServerAttributes() []attribute.KeyValue {
+	var attrs []attribute.KeyValue
+
+	for serviceName, info := range a.server.GetServiceInfo() {
+		// Add the service name
+		attrs = append(attrs, attribute.String("grpc.service", serviceName))
+
+		// Convert methods into a comma-separated string
+		var methods []string
+		for _, method := range info.Methods {
+			methods = append(methods, method.Name)
+		}
+
+		// Add methods if present
+		if len(methods) > 0 {
+			attrs = append(attrs, attribute.String("grpc.service.methods", strings.Join(methods, ",")))
+		}
+
+		// If metadata is a string, store it
+		if metadata, ok := info.Metadata.(string); ok && metadata != "" {
+			attrs = append(attrs, attribute.String("grpc.service.metadata", metadata))
+		}
+	}
+
+	return attrs
+}