Started to support SinkBinding in helm-chart. (#2)

Author: pantierra

helm-chart/eoapi-notifier/README.md

@@ -27,12 +27,24 @@ config:
         database: postgis
         username: postgres
         password: password
+
   outputs:
     - type: mqtt
       config:
         broker_host: mqtt-broker
         broker_port: 1883
 
+    - type: cloudevents
+      config:
+        source: /eoapi/pgstac
+        event_type: org.eoapi.stac.item
+        destination:
+          ref:
+            apiVersion: messaging.knative.dev/v1
+            kind: Broker
+            name: my-channel-1
+            namespace: serverless
+
 secrets:
   postgresql:
     create: true
@@ -47,3 +59,23 @@ resources:
     cpu: 100m
     memory: 128Mi
 ```
+
+## KNative SinkBinding Support
+
+The chart automatically creates KNative SinkBinding resources for CloudEvents outputs, resolving object references to URLs via the `K_SINK` environment variable.
+
+### Configuration
+
+```yaml
+outputs:
+  - type: cloudevents
+    config:
+      source: /eoapi/pgstac
+      event_type: org.eoapi.stac.item
+      destination:
+        ref:
+          apiVersion: messaging.knative.dev/v1
+          kind: Broker
+          name: my-broker
+          namespace: default  # optional
+```

helm-chart/eoapi-notifier/templates/_helpers.tpl

@@ -73,4 +73,5 @@ Return the proper image pull policy
 */}}
 {{- define "eoapi-notifier.imagePullPolicy" -}}
 {{- .Values.image.pullPolicy | default "IfNotPresent" }}
-{{- end }}
+{{- end }}
+

helm-chart/eoapi-notifier/templates/configmap.yaml

@@ -19,5 +19,10 @@ data:
     {{- range .Values.config.outputs}}
       - type: {{.type}}
         config:
+          {{- if eq .type "cloudevents"}}
+          {{- $config := omit .config "destination"}}
+          {{- toYaml $config | nindent 10}}
+          {{- else}}
           {{- toYaml .config | nindent 10}}
+          {{- end}}
     {{- end}}

helm-chart/eoapi-notifier/templates/sinkbinding.yaml

@@ -0,0 +1,24 @@
+{{- range $index, $output := .Values.config.outputs }}
+{{- if eq $output.type "cloudevents" }}
+---
+apiVersion: sources.knative.dev/v1
+kind: SinkBinding
+metadata:
+  name: {{ include "eoapi-notifier.fullname" $ }}-cloudevents-{{ $index }}
+  labels:
+    {{- include "eoapi-notifier.labels" $ | nindent 4 }}
+spec:
+  subject:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "eoapi-notifier.fullname" $ }}
+  sink:
+    ref:
+      apiVersion: {{ $output.config.destination.ref.apiVersion }}
+      kind: {{ $output.config.destination.ref.kind }}
+      name: {{ $output.config.destination.ref.name }}
+      {{- if $output.config.destination.ref.namespace }}
+      namespace: {{ $output.config.destination.ref.namespace }}
+      {{- end }}
+{{- end }}
+{{- end }}

helm-chart/eoapi-notifier/values.yaml

@@ -59,10 +59,14 @@ config:
 
     - type: cloudevents
       config:
-        # Will be overridden by K_SINK from KNative SinkBinding
-        endpoint: https://example.com/webhook
-        source: /eoapi/stac
-        event_type: org.eoapi.stac
+        source: /eoapi/pgstac
+        event_type: org.eoapi.stac.item
+        destination:
+          ref:
+            apiVersion: messaging.knative.dev/v1
+            kind: Broker
+            name: my-channel-1
+            namespace: serverless
 
 # Secrets
 secrets:
@@ -91,5 +95,4 @@ env: {}
   # CLOUDEVENTS_SOURCE: /eoapi/stac/production
   # CLOUDEVENTS_EVENT_TYPE: org.eoapi.stac.item
   #
-  # KNative examples (typically set by SinkBinding):
-  # K_SINK: https://my-knative-service.default.svc.cluster.local
+  # KNative SinkBinding automatically sets K_SINK environment variable