feat: Continuous helm polling to update database

Dockerfile

@@ -1,8 +1,27 @@
-FROM node:lts-slim AS build
+FROM alpine:latest AS download
 
-RUN npm install -g --omit=optional --omit=dev \
+ RUN apk --update add --no-cache \
+       curl \
+       jq && \
+     curl -L https://api.github.com/repos/helm/helm/releases/latest | \
+       jq -r '.tag_name' | \
+       xargs -I {} curl -L -o /tmp/helm.tar.gz https://get.helm.sh/helm-{}-linux-amd64.tar.gz && \
+     tar -xzf /tmp/helm.tar.gz --strip-components=1 -C /tmp
+
+FROM node:lts-slim
+
+COPY --from=download /tmp/helm /usr/bin/helm
+
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+RUN apt-get update && apt-get upgrade -y && apt-get install -y --no-install-recommends \
+      jq \ &&
+    npm install -g --omit=optional --omit=dev \
       json-server && \
-    npm cache clean --force
+    npm cache clean --force && \
+    rm -rf /var/lib/apt/lists/*
 
 COPY init/entrypoint.sh /opt/entrypoint.sh
 

charts/json-server/templates/configmap.yaml

@@ -54,6 +54,43 @@ data:
         <script src="script.js"></script>
       </body>
     </html>
+  update.sh: |
+    #!/bin/sh
+
+    while getopts u: flag
+    do
+      case "${flag}" in
+        u) URL=${OPTARG};;
+      esac
+    done
+
+    [ $(curl -kLs -w "%{http_code}" -o /dev/null https://$URL) != 200 ] && {
+      echo 'Could not connect to' $URL
+      exit 1
+    }
+
+    echo '['$(date "+%Y-%m-%d %H:%M:%S")'] Started polling helm releases with 60 second interval'
+
+    while sleep 60;
+    do
+      echo '['$(date "+%Y-%m-%d %H:%M:%S")']' $(curl -ks https://$URL/components | jq length) 'known releases in database'
+
+      echo -n $(helm list --all-namespaces --output json | jq -c '.[]') | while IFS= read -r release;
+      do
+        APP_NAME=$(echo $release | jq -r '.name')
+        APP_ID=$(curl -ks https://$URL/components?name=$APP_NAME | jq -r '.[0].id')
+
+        # Release is not yet in database
+        [ "$APP_ID" == null ] && {
+          curl -ks -X POST https://$URL/components -H 'Content-Type: application/json' --data "$release"
+        }
+        # Release is already in database
+        [ "$APP_ID" != null ] && {
+          curl -ks -X PATCH https://$URL/components/$APP_ID -H 'Content-Type: application/json' --data "$release"
+        }
+      done
+
+    done
   db.json: |
 {{ include "common.tplvalues.render" ( dict "value" .Values.jsonServer.seedData.configInline "context" $) | indent 4 }}
 {{- end -}}

charts/json-server/templates/deployment.yaml

@@ -62,7 +62,12 @@ spec:
           command:
           - /bin/sh
           - -c
-          - sleep infinity
+          - "/opt/update.sh -u {{ .Values.sidecar.targetUrl }}"
+          volumeMounts:
+          - name: {{ .Release.Name }}-configmap
+            mountPath: /opt/update.sh
+            subPath: update.sh
+            defaultMode: 0744
       volumes:
       - name: {{ .Release.Name }}-configmap
         configMap:

charts/json-server/values.yaml

@@ -13,10 +13,12 @@ jsonServer:
     tag: {{ image_tag }}
 
 sidecar:
+  targetUrl: metadata.example.org
   image:
-    repository: alpine/helm
+    repository: bv11-cr01.bessems.eu/library/json-server
     pullPolicy: IfNotPresent
-    tag: 3.12.1
+    # Overrides the image tag whose default is the chart appVersion.
+    tag: {{ image_tag }}
 
 replicaCount: 1