cleanup: Remove Opentracing support as no active users (#2196)

References:
[1] #2193
[2] https://fissionio.slack.com/archives/C3LUX6BBP/p1631706812069300

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/executor/api.go

@@ -28,7 +28,6 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/hashicorp/go-multierror"
 	"github.com/pkg/errors"
-	"go.opencensus.io/plugin/ochttp"
 	"go.uber.org/zap"
 
 	fv1 "github.com/fission/fission/pkg/apis/core/v1"
@@ -263,14 +262,8 @@ func (executor *Executor) GetHandler() http.Handler {
 }
 
 // Serve starts an HTTP server.
-func (executor *Executor) Serve(ctx context.Context, port int, openTracingEnabled bool) {
-	var handler http.Handler
-	if openTracingEnabled {
-		handler = &ochttp.Handler{Handler: executor.GetHandler()}
-	} else {
-		handler = otelUtils.GetHandlerWithOTEL(executor.GetHandler(), "fission-executor", otelUtils.UrlsToIgnore("/healthz"))
-	}
-
+func (executor *Executor) Serve(ctx context.Context, port int) {
+	handler := otelUtils.GetHandlerWithOTEL(executor.GetHandler(), "fission-executor", otelUtils.UrlsToIgnore("/healthz"))
 	httpserver.StartServer(ctx, executor.logger, "executor", fmt.Sprintf("%d", port), handler)
 
 }

pkg/executor/client/client.go

@@ -27,13 +27,11 @@ import (
 
 	"github.com/hashicorp/go-retryablehttp"
 	"github.com/pkg/errors"
-	"go.opencensus.io/plugin/ochttp"
 	"go.uber.org/zap"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	fv1 "github.com/fission/fission/pkg/apis/core/v1"
 	ferror "github.com/fission/fission/pkg/error"
-	"github.com/fission/fission/pkg/utils/tracing"
 )
 
 type (
@@ -57,10 +55,6 @@ type (
 // MakeClient initializes and returns a Client instance.
 func MakeClient(logger *zap.Logger, executorURL string) *Client {
 	hc := retryablehttp.NewClient()
-	if tracing.TracingEnabled(logger) {
-		hc.HTTPClient.Transport = &ochttp.Transport{Base: hc.HTTPClient.Transport}
-	}
-
 	c := &Client{
 		logger:      logger.Named("executor_client"),
 		executorURL: strings.TrimSuffix(executorURL, "/"),

pkg/executor/executor.go

@@ -253,7 +253,7 @@ func (executor *Executor) getFunctionServiceFromCache(ctx context.Context, fn *f
 
 // StartExecutor Starts executor and the executor components such as Poolmgr,
 // deploymgr and potential future executor types
-func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace string, envBuilderNamespace string, port int, openTracingEnabled bool) error {
+func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace string, envBuilderNamespace string, port int) error {
 	fissionClient, kubernetesClient, _, metricsClient, err := crd.MakeFissionClient()
 	if err != nil {
 		return errors.Wrap(err, "failed to get kubernetes client")
@@ -383,7 +383,7 @@ func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace st
 	}
 	go reaper.CleanupRoleBindings(ctx, logger, kubernetesClient, fissionClient, functionNamespace, envBuilderNamespace, time.Minute*30)
 	go metrics.ServeMetrics(ctx, logger)
-	go api.Serve(ctx, port, openTracingEnabled)
+	go api.Serve(ctx, port)
 
 	return nil
 }

pkg/executor/executor_test.go

@@ -174,7 +174,7 @@ func TestExecutor(t *testing.T) {
 	// create poolmgr
 	port := 9999
 	ctx := context.Background()
-	err = StartExecutor(ctx, logger, functionNs, "fission-builder", port, true)
+	err = StartExecutor(ctx, logger, functionNs, "fission-builder", port)
 	if err != nil {
 		log.Panicf("failed to start poolmgr: %v", err)
 	}