Chore: Remove unused dependenices in plugin client middlewares (#84624)

* Chore: Remove unused dependenices in plugin client middlewares

* refactor logger middleware to remove cfg dependency

* hack to make tracing work in api group builders

pkg/cmd/grafana/apiserver/cmd.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/cmd/grafana-server/commands"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/server"
 	"github.com/grafana/grafana/pkg/services/apiserver/standalone"
 )
@@ -47,8 +48,14 @@ func newCommandStartExampleAPIServer(o *APIServerOptions, stopCh <-chan struct{}
 				return err
 			}
 
+			// Currently TracingOptions.ApplyTo, which will configure/initialize tracing,
+			// happens after loadAPIGroupBuilders. Hack to workaround this for now to allow
+			// the tracer to be initialized at a later stage, when tracer is available.
+			// TODO: Fix so that TracingOptions.ApplyTo happens before or during loadAPIGroupBuilders.
+			tracer := newLateInitializedTracingService()
+
 			// Load each group from the args
-			if err := o.loadAPIGroupBuilders(apis); err != nil {
+			if err := o.loadAPIGroupBuilders(tracer, apis); err != nil {
 				return err
 			}
 
@@ -62,6 +69,10 @@ func newCommandStartExampleAPIServer(o *APIServerOptions, stopCh <-chan struct{}
 				return err
 			}
 
+			if o.Options.TracingOptions.TracingService != nil {
+				tracer.InitTracer(o.Options.TracingOptions.TracingService)
+			}
+
 			if err := o.RunAPIServer(config, stopCh); err != nil {
 				return err
 			}
@@ -87,3 +98,19 @@ func RunCLI(opts commands.ServerOptions) int {
 
 	return cli.Run(cmd)
 }
+
+type lateInitializedTracingService struct {
+	tracing.Tracer
+}
+
+func newLateInitializedTracingService() *lateInitializedTracingService {
+	return &lateInitializedTracingService{
+		Tracer: tracing.InitializeTracerForTest(),
+	}
+}
+
+func (s *lateInitializedTracingService) InitTracer(tracer tracing.Tracer) {
+	s.Tracer = tracer
+}
+
+var _ tracing.Tracer = &lateInitializedTracingService{}

pkg/cmd/grafana/apiserver/server.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/apiserver/builder"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/infra/tracing"
 	grafanaAPIServer "github.com/grafana/grafana/pkg/services/apiserver"
 	"github.com/grafana/grafana/pkg/services/apiserver/standalone"
 	standaloneoptions "github.com/grafana/grafana/pkg/services/apiserver/standalone/options"
@@ -50,10 +51,10 @@ func newAPIServerOptions(out, errOut io.Writer) *APIServerOptions {
 	}
 }
 
-func (o *APIServerOptions) loadAPIGroupBuilders(apis []schema.GroupVersion) error {
+func (o *APIServerOptions) loadAPIGroupBuilders(tracer tracing.Tracer, apis []schema.GroupVersion) error {
 	o.builders = []builder.APIGroupBuilder{}
 	for _, gv := range apis {
-		api, err := o.factory.MakeAPIServer(gv)
+		api, err := o.factory.MakeAPIServer(tracer, gv)
 		if err != nil {
 			return err
 		}

pkg/services/apiserver/standalone/factory.go

@@ -34,7 +34,7 @@ type APIServerFactory interface {
 	GetEnabled(runtime []RuntimeConfig) ([]schema.GroupVersion, error)
 
 	// Make an API server for a given group+version
-	MakeAPIServer(gv schema.GroupVersion) (builder.APIGroupBuilder, error)
+	MakeAPIServer(tracer tracing.Tracer, gv schema.GroupVersion) (builder.APIGroupBuilder, error)
 }
 
 // Zero dependency provider for testing
@@ -62,7 +62,7 @@ func (p *DummyAPIFactory) GetEnabled(runtime []RuntimeConfig) ([]schema.GroupVer
 	return gv, nil
 }
 
-func (p *DummyAPIFactory) MakeAPIServer(gv schema.GroupVersion) (builder.APIGroupBuilder, error) {
+func (p *DummyAPIFactory) MakeAPIServer(tracer tracing.Tracer, gv schema.GroupVersion) (builder.APIGroupBuilder, error) {
 	if gv.Version != "v0alpha1" {
 		return nil, fmt.Errorf("only alpha supported now")
 	}
@@ -79,9 +79,9 @@ func (p *DummyAPIFactory) MakeAPIServer(gv schema.GroupVersion) (builder.APIGrou
 				Client: client.NewTestDataClient(),
 			},
 			client.NewTestDataRegistry(),
-			nil,                               // legacy lookup
-			prometheus.NewRegistry(),          // ???
-			tracing.InitializeTracerForTest(), // ???
+			nil,                      // legacy lookup
+			prometheus.NewRegistry(), // ???
+			tracer,
 		)
 
 	case "featuretoggle.grafana.app":

pkg/services/pluginsintegration/clientmiddleware/logger_middleware.go

@@ -10,30 +10,22 @@ import (
 	"github.com/grafana/grafana/pkg/plugins"
 	plog "github.com/grafana/grafana/pkg/plugins/log"
 	"github.com/grafana/grafana/pkg/plugins/pluginrequestmeta"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
-	"github.com/grafana/grafana/pkg/setting"
 )
 
 // NewLoggerMiddleware creates a new plugins.ClientMiddleware that will
 // log requests.
-func NewLoggerMiddleware(cfg *setting.Cfg, logger plog.Logger, features featuremgmt.FeatureToggles) plugins.ClientMiddleware {
+func NewLoggerMiddleware(logger plog.Logger) plugins.ClientMiddleware {
 	return plugins.ClientMiddlewareFunc(func(next plugins.Client) plugins.Client {
-		if !cfg.PluginLogBackendRequests {
-			return next
-		}
-
 		return &LoggerMiddleware{
-			next:     next,
-			logger:   logger,
-			features: features,
+			next:   next,
+			logger: logger,
 		}
 	})
 }
 
 type LoggerMiddleware struct {
-	next     plugins.Client
-	logger   plog.Logger
-	features featuremgmt.FeatureToggles
+	next   plugins.Client
+	logger plog.Logger
 }
 
 func (m *LoggerMiddleware) logRequest(ctx context.Context, fn func(ctx context.Context) (requestStatus, error)) error {

pkg/services/pluginsintegration/clientmiddleware/metrics_middleware.go

@@ -11,7 +11,6 @@ import (
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/plugins/manager/registry"
 	"github.com/grafana/grafana/pkg/plugins/pluginrequestmeta"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 )
 
 // pluginMetrics contains the prometheus metrics used by the MetricsMiddleware.
@@ -27,11 +26,10 @@ type pluginMetrics struct {
 type MetricsMiddleware struct {
 	pluginMetrics
 	pluginRegistry registry.Service
-	features       featuremgmt.FeatureToggles
 	next           plugins.Client
 }
 
-func newMetricsMiddleware(promRegisterer prometheus.Registerer, pluginRegistry registry.Service, features featuremgmt.FeatureToggles) *MetricsMiddleware {
+func newMetricsMiddleware(promRegisterer prometheus.Registerer, pluginRegistry registry.Service) *MetricsMiddleware {
 	additionalLabels := []string{"status_source"}
 	pluginRequestCounter := prometheus.NewCounterVec(prometheus.CounterOpts{
 		Namespace: "grafana",
@@ -72,13 +70,12 @@ func newMetricsMiddleware(promRegisterer prometheus.Registerer, pluginRegistry r
 			pluginRequestDurationSeconds: pluginRequestDurationSeconds,
 		},
 		pluginRegistry: pluginRegistry,
-		features:       features,
 	}
 }
 
 // NewMetricsMiddleware returns a new MetricsMiddleware.
-func NewMetricsMiddleware(promRegisterer prometheus.Registerer, pluginRegistry registry.Service, features featuremgmt.FeatureToggles) plugins.ClientMiddleware {
-	imw := newMetricsMiddleware(promRegisterer, pluginRegistry, features)
+func NewMetricsMiddleware(promRegisterer prometheus.Registerer, pluginRegistry registry.Service) plugins.ClientMiddleware {
+	imw := newMetricsMiddleware(promRegisterer, pluginRegistry)
 	return plugins.ClientMiddlewareFunc(func(next plugins.Client) plugins.Client {
 		imw.next = next
 		return imw

pkg/services/pluginsintegration/clientmiddleware/metrics_middleware_test.go

@@ -17,7 +17,6 @@ import (
 	"github.com/grafana/grafana/pkg/plugins/manager/client/clienttest"
 	"github.com/grafana/grafana/pkg/plugins/manager/fakes"
 	"github.com/grafana/grafana/pkg/plugins/pluginrequestmeta"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 )
 
 const (
@@ -76,7 +75,7 @@ func TestInstrumentationMiddleware(t *testing.T) {
 					JSONData: plugins.JSONData{ID: pluginID, Backend: true},
 				}))
 
-				mw := newMetricsMiddleware(promRegistry, pluginsRegistry, featuremgmt.WithFeatures())
+				mw := newMetricsMiddleware(promRegistry, pluginsRegistry)
 				cdt := clienttest.NewClientDecoratorTest(t, clienttest.WithMiddlewares(
 					plugins.ClientMiddlewareFunc(func(next plugins.Client) plugins.Client {
 						mw.next = next
@@ -153,7 +152,7 @@ func TestInstrumentationMiddlewareStatusSource(t *testing.T) {
 	require.NoError(t, pluginsRegistry.Add(context.Background(), &plugins.Plugin{
 		JSONData: plugins.JSONData{ID: pluginID, Backend: true},
 	}))
-	metricsMw := newMetricsMiddleware(promRegistry, pluginsRegistry, featuremgmt.WithFeatures())
+	metricsMw := newMetricsMiddleware(promRegistry, pluginsRegistry)
 	cdt := clienttest.NewClientDecoratorTest(t, clienttest.WithMiddlewares(
 		NewPluginRequestMetaMiddleware(),
 		plugins.ClientMiddlewareFunc(func(next plugins.Client) plugins.Client {

pkg/services/pluginsintegration/pluginsintegration.go

@@ -160,14 +160,18 @@ func NewClientDecorator(
 func CreateMiddlewares(cfg *setting.Cfg, oAuthTokenService oauthtoken.OAuthTokenService, tracer tracing.Tracer, cachingService caching.CachingService, features *featuremgmt.FeatureManager, promRegisterer prometheus.Registerer, registry registry.Service) []plugins.ClientMiddleware {
 	middlewares := []plugins.ClientMiddleware{
 		clientmiddleware.NewPluginRequestMetaMiddleware(),
+		clientmiddleware.NewTracingMiddleware(tracer),
+		clientmiddleware.NewMetricsMiddleware(promRegisterer, registry),
+		clientmiddleware.NewContextualLoggerMiddleware(),
+	}
+
+	if cfg.PluginLogBackendRequests {
+		middlewares = append(middlewares, clientmiddleware.NewLoggerMiddleware(log.New("plugin.instrumentation")))
 	}
 
 	skipCookiesNames := []string{cfg.LoginCookieName}
+
 	middlewares = append(middlewares,
-		clientmiddleware.NewTracingMiddleware(tracer),
-		clientmiddleware.NewMetricsMiddleware(promRegisterer, registry, features),
-		clientmiddleware.NewContextualLoggerMiddleware(),
-		clientmiddleware.NewLoggerMiddleware(cfg, log.New("plugin.instrumentation"), features),
 		clientmiddleware.NewTracingHeaderMiddleware(),
 		clientmiddleware.NewClearAuthHeadersMiddleware(),
 		clientmiddleware.NewOAuthTokenMiddleware(oAuthTokenService),