Add context wrappers to genreconciler

codegen/cmd/injection-gen/generators/reconciler_controller.go

@@ -274,6 +274,9 @@ func NewImpl(ctx {{.contextContext|raw}}, r Interface{{if .hasClass}}, classValu
 		if opts.DemoteFunc != nil {
 			rec.DemoteFunc = opts.DemoteFunc
 		}
+		if len(opts.ContextWrappers) != 0 {
+			rec.ContextWrappers = append(rec.ContextWrappers, opts.ContextWrappers...)
+		}
 	}
 
 	rec.Recorder = createRecorder(ctx, agentName)

codegen/cmd/injection-gen/generators/reconciler_reconciler.go

@@ -283,6 +283,9 @@ type reconcilerImpl struct {
 	// Kubernetes API.
 	Recorder {{.recordEventRecorder|raw}}
 
+	// ContextWrappers allows to decorate the context passed to the reconcile methods
+	ContextWrappers []func(context.Context)context.Context
+
 	// configStore allows for decorating a context with config maps.
 	// +optional
 	configStore {{.reconcilerConfigStore|raw}}
@@ -366,6 +369,9 @@ func NewReconciler(ctx {{.contextContext|raw}}, logger *{{.zapSugaredLogger|raw}
 		if opts.DemoteFunc != nil {
 			rec.DemoteFunc = opts.DemoteFunc
 		}
+		if len(opts.ContextWrappers) != 0 {
+			rec.ContextWrappers = append(rec.ContextWrappers, opts.ContextWrappers...)
+		}
 	}
 
 	return rec
@@ -401,6 +407,11 @@ func (r *reconcilerImpl) Reconcile(ctx {{.contextContext|raw}}, key string) erro
 	// Add the recorder to context.
 	ctx = {{.controllerWithEventRecorder|raw}}(ctx, r.Recorder)
 
+	// Decorate the context with additional wrapper functions
+	for _, fn := range r.ContextWrappers {
+		ctx = fn(ctx)
+	}
+
 	// Get the resource with this namespace/name.
 	{{if .nonNamespaced}}
 	getter := r.Lister

controller/options.go

@@ -16,7 +16,11 @@ limitations under the License.
 
 package controller
 
-import "knative.dev/pkg/reconciler"
+import (
+	"context"
+
+	"knative.dev/pkg/reconciler"
+)
 
 // Options is additional resources a Controller might want to use depending
 // on implementation.
@@ -38,9 +42,20 @@ type Options struct {
 
 	// DemoteFunc configures the demote function this reconciler uses
 	DemoteFunc func(b reconciler.Bucket)
+
+	// ContextWrappers configures the functions to invoke to wrap the context provided to the reconciliation functions
+	ContextWrappers []func(context.Context) context.Context
 }
 
 // OptionsFn is a callback method signature that accepts an Impl and returns
 // Options. Used for controllers that need access to the members of Options but
 // to build Options, integrators need an Impl.
 type OptionsFn func(impl *Impl) Options
+
+// WithContextWrapper adds a context wrapper.
+// You can add several context wrappers to the same reconciler impl.
+func WithContextWrapper(fn func(context.Context) context.Context) OptionsFn {
+	return func(impl *Impl) Options {
+		return Options{ContextWrappers: []func(context.Context) context.Context{fn}}
+	}
+}

controller/options_test.go

@@ -0,0 +1,31 @@
+/*
+Copyright 2021 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+	"testing"
+)
+
+func TestWithContextWrapper(t *testing.T) {
+	options := WithContextWrapper(func(ctx context.Context) context.Context {
+		return context.Background()
+	})(nil)
+	if len(options.ContextWrappers) != 1 {
+		t.Error("Length of ContextWrappers should be 1")
+	}
+}