Add Kafka Source defaults, starting with KEDA annotations

cmd/source/controller/main.go

@@ -20,28 +20,29 @@ import (
 	"context"
 	"os"
 
-	"knative.dev/eventing-kafka/pkg/apis/bindings"
-	"knative.dev/eventing-kafka/pkg/apis/sources"
-	"knative.dev/pkg/webhook/resourcesemantics/conversion"
-
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
-	bindingsv1beta1 "knative.dev/eventing-kafka/pkg/apis/bindings/v1beta1"
-	sourcesv1beta1 "knative.dev/eventing-kafka/pkg/apis/sources/v1beta1"
-
-	"knative.dev/eventing-kafka/pkg/source/reconciler/binding"
-	"knative.dev/eventing-kafka/pkg/source/reconciler/source"
 	"knative.dev/pkg/configmap"
 	"knative.dev/pkg/controller"
 	"knative.dev/pkg/injection"
 	"knative.dev/pkg/injection/sharedmain"
+	"knative.dev/pkg/logging"
 	"knative.dev/pkg/signals"
 	"knative.dev/pkg/webhook"
 	"knative.dev/pkg/webhook/certificates"
 	"knative.dev/pkg/webhook/psbinding"
 	"knative.dev/pkg/webhook/resourcesemantics"
+	"knative.dev/pkg/webhook/resourcesemantics/conversion"
 	"knative.dev/pkg/webhook/resourcesemantics/defaulting"
 	"knative.dev/pkg/webhook/resourcesemantics/validation"
+
+	"knative.dev/eventing-kafka/pkg/apis/bindings"
+	bindingsv1beta1 "knative.dev/eventing-kafka/pkg/apis/bindings/v1beta1"
+	"knative.dev/eventing-kafka/pkg/apis/sources"
+	kafkasourcedefaultconfig "knative.dev/eventing-kafka/pkg/apis/sources/config"
+	sourcesv1beta1 "knative.dev/eventing-kafka/pkg/apis/sources/v1beta1"
+	"knative.dev/eventing-kafka/pkg/source/reconciler/binding"
+	"knative.dev/eventing-kafka/pkg/source/reconciler/source"
 )
 
 const (
@@ -57,6 +58,15 @@ var types = map[schema.GroupVersionKind]resourcesemantics.GenericCRD{
 var callbacks = map[schema.GroupVersionKind]validation.Callback{}
 
 func NewDefaultingAdmissionController(ctx context.Context, cmw configmap.Watcher) *controller.Impl {
+	// Decorate contexts with the current state of the config.
+	kafkaStore := kafkasourcedefaultconfig.NewStore(logging.FromContext(ctx).Named("kafka-source-config-store"))
+	kafkaStore.WatchConfigs(cmw)
+
+	// Decorate contexts with the current state of the config.
+	ctxFunc := func(ctx context.Context) context.Context {
+		return kafkaStore.ToContext(ctx)
+	}
+
 	return defaulting.NewAdmissionController(ctx,
 
 		// Name of the resource webhook.
@@ -69,11 +79,7 @@ func NewDefaultingAdmissionController(ctx context.Context, cmw configmap.Watcher
 		types,
 
 		// A function that infuses the context passed to Validate/SetDefaults with custom metadata.
-		func(ctx context.Context) context.Context {
-			// Here is where you would infuse the context with state
-			// (e.g. attach a store with configmap data)
-			return ctx
-		},
+		ctxFunc,
 
 		// Whether to disallow unknown fields.
 		true,

cmd/source/mtcontroller/main.go

@@ -20,28 +20,31 @@ import (
 	"context"
 	"os"
 
-	"knative.dev/eventing-kafka/pkg/apis/bindings"
-	"knative.dev/eventing-kafka/pkg/apis/sources"
 	"knative.dev/pkg/webhook/resourcesemantics/conversion"
 
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
-	bindingsv1beta1 "knative.dev/eventing-kafka/pkg/apis/bindings/v1beta1"
-	sourcesv1beta1 "knative.dev/eventing-kafka/pkg/apis/sources/v1beta1"
-
-	"knative.dev/eventing-kafka/pkg/source/reconciler/binding"
 	source "knative.dev/eventing-kafka/pkg/source/reconciler/mtsource"
 	"knative.dev/pkg/configmap"
 	"knative.dev/pkg/controller"
 	"knative.dev/pkg/injection"
 	"knative.dev/pkg/injection/sharedmain"
+	"knative.dev/pkg/logging"
 	"knative.dev/pkg/signals"
 	"knative.dev/pkg/webhook"
 	"knative.dev/pkg/webhook/certificates"
 	"knative.dev/pkg/webhook/psbinding"
 	"knative.dev/pkg/webhook/resourcesemantics"
 	"knative.dev/pkg/webhook/resourcesemantics/defaulting"
 	"knative.dev/pkg/webhook/resourcesemantics/validation"
+
+	"knative.dev/eventing-kafka/pkg/apis/bindings"
+	bindingsv1beta1 "knative.dev/eventing-kafka/pkg/apis/bindings/v1beta1"
+	"knative.dev/eventing-kafka/pkg/apis/sources"
+	sourcesv1beta1 "knative.dev/eventing-kafka/pkg/apis/sources/v1beta1"
+	"knative.dev/eventing-kafka/pkg/source/reconciler/binding"
+
+	kafkasourcedefaultconfig "knative.dev/eventing-kafka/pkg/apis/sources/config"
 )
 
 const (
@@ -57,6 +60,15 @@ var types = map[schema.GroupVersionKind]resourcesemantics.GenericCRD{
 var callbacks = map[schema.GroupVersionKind]validation.Callback{}
 
 func NewDefaultingAdmissionController(ctx context.Context, cmw configmap.Watcher) *controller.Impl {
+	// Decorate contexts with the current state of the config.
+	kafkaStore := kafkasourcedefaultconfig.NewStore(logging.FromContext(ctx).Named("kafka-source-config-store"))
+	kafkaStore.WatchConfigs(cmw)
+
+	// Decorate contexts with the current state of the config.
+	ctxFunc := func(ctx context.Context) context.Context {
+		return kafkaStore.ToContext(ctx)
+	}
+
 	return defaulting.NewAdmissionController(ctx,
 
 		// Name of the resource webhook.
@@ -69,11 +81,7 @@ func NewDefaultingAdmissionController(ctx context.Context, cmw configmap.Watcher
 		types,
 
 		// A function that infuses the context passed to Validate/SetDefaults with custom metadata.
-		func(ctx context.Context) context.Context {
-			// Here is where you would infuse the context with state
-			// (e.g. attach a store with configmap data)
-			return ctx
-		},
+		ctxFunc,
 
 		// Whether to disallow unknown fields.
 		true,
@@ -92,6 +100,7 @@ func NewValidationAdmissionController(ctx context.Context, cmw configmap.Watcher
 		// The resources to validate.
 		types,
 
+		// A function that infuses the context passed to Validate/SetDefaults with custom metadata.
 		// A function that infuses the context passed to Validate/SetDefaults with custom metadata.
 		func(ctx context.Context) context.Context {
 			// Here is where you would infuse the context with state

config/source/common/configmaps/config-kafka-source-defaults.yaml

@@ -0,0 +1,58 @@
+# Copyright 2020 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.
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: config-kafka-source-defaults
+  namespace: knative-eventing
+  labels:
+    eventing.knative.dev/release: devel
+  annotations:
+    knative.dev/example-checksum: "b6ed351d"
+data:
+  _example: |
+    ################################
+    #                              #
+    #    EXAMPLE CONFIGURATION     #
+    #                              #
+    ################################
+
+    # This block is not actually functional configuration,
+    # but serves to illustrate the available configuration
+    # options and document them in a way that is accessible
+    # to users that `kubectl edit` this config map.
+    #
+    # These sample configuration options may be copied out of
+    # this example block and unindented to be in the data block
+    # to actually change the configuration.
+
+    # autoscalingClass is the autoscaler class name to use.
+    # valid value: keda.autoscaling.knative.dev
+    # autoscalingClass: ""
+
+    # minScale is the minimum number of replicas to scale down to.
+    # minScale: "1"
+
+    # maxScale is the maximum number of replicas to scale up to.
+    # maxScale: "1"
+
+    # pollingInterval is the interval in seconds KEDA uses to poll metrics.
+    # pollingInterval: "30"
+
+    # cooldownPeriod is the period of time in seconds KEDA waits until it scales down.
+    # cooldownPeriod: "300"
+
+    # kafkaLagThreshold is the lag (ie. number of messages in a partition) threshold for KEDA to scale up sources.
+    # kafkaLagThreshold: "10"

config/source/multi/400-config-kafka-source-defaults.yaml

@@ -0,0 +1 @@
+../common/configmaps/config-kafka-source-defaults.yaml

config/source/single/400-config-kafka-source-defaults.yaml

@@ -0,0 +1 @@
+../common/configmaps/config-kafka-source-defaults.yaml

hack/tools.go

@@ -20,6 +20,7 @@ package tools
 
 import (
 	_ "knative.dev/hack"
+	_ "knative.dev/pkg/configmap/hash-gen"
 	_ "knative.dev/pkg/hack"
 
 	// Test images from eventing

hack/update-checksums.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# Copyright 2020 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+export GO111MODULE=on
+
+if [ -z "${GOPATH:-}" ]; then
+  export GOPATH=$(go env GOPATH)
+fi
+
+source $(dirname $0)/../vendor/knative.dev/hack/library.sh
+
+go run "${REPO_ROOT_DIR}/vendor/knative.dev/pkg/configmap/hash-gen" "${REPO_ROOT_DIR}"/config/source/common/configmaps/*.yaml

pkg/apis/sources/config/doc.go

@@ -0,0 +1,21 @@
+/*
+Copyright 2020 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.
+*/
+
+// +k8s:deepcopy-gen=package
+
+// Package config holds the typed objects that define the schemas for
+// ConfigMap objects that pertain to our API objects.
+package config