Fix HTTP Server errors (#498)

* Use unmarshalled struct for reading plugin config
* Use background context to prevent cancellation

api/api.go

@@ -100,7 +100,7 @@ func (a *API) GetGlobalConfig(_ context.Context, group *v1.Group) (*structpb.Str
 
 // GetPluginConfig returns the plugin configuration of the GatewayD.
 func (a *API) GetPluginConfig(context.Context, *emptypb.Empty) (*structpb.Struct, error) {
-	jsonData, err := json.Marshal(a.Config.PluginKoanf.All())
+	jsonData, err := json.Marshal(a.Config.Plugin)
 	if err != nil {
 		metrics.APIRequestsErrors.WithLabelValues(
 			"GET", "/v1/GatewayDPluginService/GetPluginConfig", codes.Internal.String(),

api/http_server.go

@@ -50,16 +50,12 @@ func (s *HTTPServer) Shutdown(ctx context.Context) {
 
 // CreateHTTPAPI creates a new HTTP API.
 func createHTTPAPI(options *Options) *http.Server {
-	ctx := context.Background()
-	ctx, cancel := context.WithCancel(ctx)
-	defer cancel()
-
 	// Register gRPC server endpoint
 	// TODO: Make this configurable with TLS and Auth.
 	rmux := runtime.NewServeMux()
 	opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
 	err := v1.RegisterGatewayDAdminAPIServiceHandlerFromEndpoint(
-		ctx, rmux, options.GRPCAddress, opts)
+		context.Background(), rmux, options.GRPCAddress, opts)
 	if err != nil {
 		options.Logger.Err(err).Msg("failed to start HTTP API")
 	}