[GitHub] [camel-k] lburgazzoli commented on a change in pull request #2838: Add support for KEDA

[GitBox <gi...@apache.org>]

lburgazzoli commented on a change in pull request #2838:
URL: https://github.com/apache/camel-k/pull/2838#discussion_r777928668



##########
File path: addons/keda/keda.go
##########
@@ -0,0 +1,551 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 keda
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"sort"
+	"strings"
+	"text/template"
+
+	kedav1alpha1 "github.com/apache/camel-k/addons/keda/duck/v1alpha1"
+	camelv1 "github.com/apache/camel-k/pkg/apis/camel/v1"
+	camelv1alpha1 "github.com/apache/camel-k/pkg/apis/camel/v1alpha1"
+	"github.com/apache/camel-k/pkg/kamelet/repository"
+	"github.com/apache/camel-k/pkg/metadata"
+	"github.com/apache/camel-k/pkg/platform"
+	"github.com/apache/camel-k/pkg/trait"
+	"github.com/apache/camel-k/pkg/util"
+	"github.com/apache/camel-k/pkg/util/kubernetes"
+	"github.com/apache/camel-k/pkg/util/property"
+	"github.com/apache/camel-k/pkg/util/source"
+	"github.com/apache/camel-k/pkg/util/uri"
+	"github.com/pkg/errors"
+	scase "github.com/stoewer/go-strcase"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	ctrl "sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+const (
+	// kameletURNMetadataPrefix allows binding Kamelet properties to KEDA metadata.
+	kameletURNMetadataPrefix = "urn:keda:metadata:"
+	// kameletURNAuthenticationPrefix allows binding Kamelet properties to KEDA authentication options.
+	kameletURNAuthenticationPrefix = "urn:keda:authentication:"
+	// kameletURNRequiredTag is used to mark properties required by KEDA.
+	kameletURNRequiredTag = "urn:keda:required"
+
+	// kameletAnnotationType indicates the scaler type associated to a Kamelet.
+	kameletAnnotationType = "camel.apache.org/keda.type"
+	// kameletAnnotationMetadataPrefix is used to define virtual metadata fields computed from Kamelet properties.
+	kameletAnnotationMetadataPrefix = "camel.apache.org/keda.metadata."
+	// kameletAnnotationAuthenticationPrefix is used to define virtual authentication fields computed from Kamelet properties.
+	kameletAnnotationAuthenticationPrefix = "camel.apache.org/keda.authentication."
+)
+
+// The KEDA trait can be used for automatic integration with KEDA autoscalers.
+// The trait can be either manually configured using the `triggers` option or automatically configured
+// via markers in the Kamelets.
+//
+// For information on how to use KEDA enabled Kamelets with the KEDA trait, refer to
+// xref:ROOT:kamelets/kamelets-user.adoc#kamelet-keda-user[the KEDA section in the Kamelets user guide].
+// If you want to create Kamelets that contain KEDA metadata, refer to
+// xref:ROOT:kamelets/kamelets-dev.adoc#kamelet-keda-dev[the KEDA section in the Kamelets development guide].
+//
+// The KEDA trait is disabled by default.
+//
+// +camel-k:trait=keda.
+type kedaTrait struct {
+	trait.BaseTrait `property:",squash"`
+	// Enables automatic configuration of the trait. Allows the trait to infer KEDA triggers from the Kamelets.
+	Auto *bool `property:"auto" json:"auto,omitempty"`
+	// Convert metadata properties to camelCase (needed because Camel K trait properties use kebab-case from command line). Disabled by default.
+	CamelCaseConversion *bool `property:"camel-case-conversion" json:"camelCaseConversion,omitempty"`
+	// Set the spec->replicas field on the top level controller to an explicit value if missing, to allow KEDA to recognize it as a scalable resource.

Review comment:
       +1 to make the value explicit




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