Function addExternalDependencyToTrailer

grpc/server.go:159–168

addExternalDependencyToTrailer adds the external dependencies to the grpc trailer. This is used to track external dependencies which are updated during the request lifecycle.

(ctx context.Context)

// addExternalDependencyToTrailer adds the external dependencies to the grpc trailer.
// This is used to track external dependencies which are updated during the request lifecycle.
func addExternalDependencyToTrailer(ctx context.Context) error {
	edc := middleware.ExternalDependencyContextFromContext(ctx)
	if edc == nil {
		return nil
	}

	md := metadata.Pairs(MetadataKeyExternalDependencies, edc.String())

	return grpc.SetTrailer(ctx, md)
}

func prepareContext(ctx context.Context) (context.Context, metadata.MD) {
	md, _ := metadata.FromIncomingContext(ctx)