feat: Add sidecar for continuous polling

.drone.yml

@@ -48,7 +48,7 @@ steps:
   pull: always
   commands:
   - |
-    export IMAGE_TAG=$(cat .version) && [ -n "$IMAGE_TAG" ] || echo 'No release tag - exiting'; exit 0
+    export IMAGE_TAG=$(cat .version 2> /dev/null) && [ -n "$IMAGE_TAG" ] || echo 'No release tag - exiting'; exit 0
   - |
     wget https://github.com/jqlang/jq/releases/download/jq-1.6/jq-linux64 -qO /bin/jq
     chmod +x /bin/jq
@@ -73,7 +73,7 @@ steps:
   pull: always
   commands:
   - |
-    export IMAGE_TAG=$(cat .version) && [ -n "$IMAGE_TAG" ] || echo 'No release tag - exiting'; exit 0
+    export IMAGE_TAG=$(cat .version 2> /dev/null) && [ -n "$IMAGE_TAG" ] || echo 'No release tag - exiting'; exit 0
   - |
     wget https://github.com/jqlang/jq/releases/download/jq-1.6/jq-linux64 -qO /bin/jq
     chmod +x /bin/jq
@@ -98,7 +98,7 @@ steps:
   pull: always
   commands:
   - |
-    export CHART_VERSION=$(cat .version) && [ -n "$CHART_VERSION" ] || echo 'No release tag - exiting'; exit 0
+    export CHART_VERSION=$(cat .version 2> /dev/null) && [ -n "$CHART_VERSION" ] || echo 'No release tag - exiting'; exit 0
     sed -i 's/{{ chart_version }}/'$CHART_VERSION'/g' charts/json-server/Chart.yaml
     sed -i 's/tag: latest/tag: '$CHART_VERSION'/g' charts/json-server/values.yaml
   - |
@@ -129,7 +129,7 @@ steps:
   pull: always
   commands:
   - |
-    export VALID_TAG=$(cat .version) && [ -n "$VALID_TAG" ] || echo 'No release tag - exiting'; exit 0
+    export VALID_TAG=$(cat .version 2> /dev/null) && [ -n "$VALID_TAG" ] || echo 'No release tag - exiting'; exit 0
   - |
     apt-get update
   - |

charts/json-server/templates/clusterrole.yaml

@@ -0,0 +1,8 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: {{ .Release.Name }}-clusterrole
+rules:
+- apiGroups: [""]
+  resources: ["secrets"]
+  verbs: ["get", "list"]

charts/json-server/templates/clusterrolebinding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ .Release.Name }}-clusterrolebinding
+subjects:
+- kind: ServiceAccount
+  name: {{ include "json-server.serviceAccountName" . }}
+  namespace: {{ Release.Namespace }}
+roleRef:
+  kind: ClusterRole
+  name: {{ .Release.Name }}-clusterrole
+  apiGroup: rbac.authorization.k8s.io

charts/json-server/templates/configmap.yaml

@@ -1,4 +1,4 @@
-{{- if not .Values.seedData.existingConfigMap }}
+{{- if not .Values.json-server.seedData.existingConfigMap }}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -55,5 +55,5 @@ data:
       </body>
     </html>
   db.json: |
-{{ include "common.tplvalues.render" ( dict "value" .Values.seedData.configInline "context" $) | indent 4 }}
+{{ include "common.tplvalues.render" ( dict "value" .Values.json-server.seedData.configInline "context" $) | indent 4 }}
 {{- end -}}

charts/json-server/templates/deployment.yaml

@@ -29,8 +29,8 @@ spec:
         - name: {{ .Chart.Name }}
           securityContext:
             {{- toYaml .Values.securityContext | nindent 12 }}
-          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
-          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          image: "{{ .Values.json-server.image.repository }}:{{ .Values.json-server.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.json-server.image.pullPolicy }}
           ports:
             - name: http
               containerPort: {{ .Values.service.port }}
@@ -52,6 +52,17 @@ spec:
           - name: {{ .Release.Name }}-configmap
             mountPath: /usr/local/lib/node_modules/json-server/public/index.html
             subPath: index.html
+        - name: {{ .Chart.Name }}-sidecar
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          image: "{{ .Values.sidecar.image.repository }}:{{ .Values.sidecar.image.tag }}"
+          imagePullPolicy: {{ .Values.sidecar.image.pullPolicy }}
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+          command:
+          - /bin/sh
+          - -c
+          - sleep infinity
       volumes:
       - name: {{ .Release.Name }}-configmap
         configMap:

charts/json-server/values.yaml

@@ -1,18 +1,25 @@
 # Default values for json-server.
 
+json-server:
   seedData:
     # Not implemented yet
     # existingConfigMap: ""
     configInline: {}
 
-replicaCount: 1
-
   image:
     repository: bv11-cr01.bessems.eu/library/json-server
     pullPolicy: IfNotPresent
     # Overrides the image tag whose default is the chart appVersion.
     tag: latest
 
+sidecar:
+  image:
+    repository: alpine/helm
+    pullPolicy: IfNotPresent
+    tag: 3.12.1
+
+replicaCount: 1
+
 imagePullSecrets: []
 nameOverride: ""
 fullnameOverride: ""