feat: add a Helm chart

.github/workflows/cd-chart.yml

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+name: Release Charts
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.4.0
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.2.0
+        with:
+          charts_repo_url: https://charts.mercure.rocks
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/ci-chart.yml

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+name: Lint and Test Charts
+
+on: pull_request
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    env:
+      CT_TARGET_BRANCH: main
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.4.0
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.0.1
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed)
+          if [[ -n "$changed" ]]; then
+            echo "::set-output name=changed::true"
+          fi
+
+      - name: Run chart-testing (lint)
+        run: ct lint
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.0.0
+        if: steps.list-changed.outputs.changed == 'true'
+
+      - name: Run chart-testing (install)
+        run: ct install

charts/mercure/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

charts/mercure/Chart.yaml

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+apiVersion: v2
+name: mercure
+description: The Mercure hub allows to push data updates using the Mercure protocol to web browsers and other HTTP clients in a convenient, fast, reliable and battery-efficient way
+home: https://mercure.rocks
+icon: https://mercure.rocks/static/logo.svg
+sources:
+- https://github.com/dunglas/mercure
+keywords:
+- mercure
+- hub
+- push
+- streaming-api
+- async-api
+type: application
+version: 0.11.3
+appVersion: "v0.11.3"
+maintainers:
+  - name: dunglas
+    email: kevin@dunglas.fr
+    url: https://dunglas.fr

charts/mercure/templates/NOTES.txt

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+1. Get the URL of the Mercure Hub by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "mercure.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "mercure.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "mercure.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "mercure.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}

charts/mercure/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "mercure.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "mercure.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "mercure.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "mercure.labels" -}}
+helm.sh/chart: {{ include "mercure.chart" . }}
+{{ include "mercure.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "mercure.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "mercure.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "mercure.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "mercure.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

charts/mercure/templates/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "mercure.fullname" . }}
+  labels:
+    {{- include "mercure.labels" . | nindent 4 }}
+data:
+  debug: "{{ if .Values.debug }}debug{{ end }}"
+  publisher-jwt-alg: {{ .Values.publisherJwtAlg | quote }}
+  subscriber-jwt-alg: {{ .Values.subscriberJwtAlg | quote }}

charts/mercure/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "mercure.fullname" . }}
+  labels:
+    {{- include "mercure.labels" . | nindent 4 }}
+spec:
+  {{- if not .Values.autoscaling.enabled }}
+  replicas: {{ .Values.replicaCount }}
+  {{- end }}
+  selector:
+    matchLabels:
+      {{- include "mercure.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      labels:
+        {{- include "mercure.selectorLabels" . | nindent 8 }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "mercure.serviceAccountName" . }}
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      containers:
+        - name: {{ .Chart.Name }}
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          {{- if .Values.dev }}
+          command: ["caddy"]
+          args: ["run", "--config", "/etc/caddy/Caddyfile.dev", "--adapter", "caddyfile"]
+          {{- end }}
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          env:
+            - name: SERVER_NAME
+              value: :80
+            - name: DEBUG
+              valueFrom:
+                configMapKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: debug
+            - name: MERCURE_TRANSPORT_URL
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: transport-url
+            - name: MERCURE_PUBLISHER_JWT_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: publisher-jwt-key
+            - name: MERCURE_PUBLISHER_JWT_ALG
+              valueFrom:
+                configMapKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: publisher-jwt-alg
+            - name: MERCURE_SUBSCRIBER_JWT_KEY
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: subscriber-jwt-key
+            - name: MERCURE_SUBSCRIBER_JWT_ALG
+              valueFrom:
+                configMapKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: subscriber-jwt-alg
+            - name: MERCURE_EXTRA_DIRECTIVES
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "mercure.fullname" . }}
+                  key: extra-directives
+          {{- if .Values.persistence.enabled }}
+          volumeMounts:
+            - mountPath: /data
+              name: mercure-data
+          {{- end }}
+          ports:
+            - name: http
+              containerPort: 80
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+          lifecycle:
+            preStop:
+              exec:
+                command: ["curl", "-XPOST", "http://localhost:2019/stop"]
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- if .Values.persistence.enabled }}
+      volumes:
+        - name: mercure-data
+          persistentVolumeClaim:
+            claimName: {{ .Values.persistence.existingClaim | default (include "mercure.fullname" .) }}
+      {{- end }}

charts/mercure/templates/hpa.yaml

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+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "mercure.fullname" . }}
+  labels:
+    {{- include "mercure.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "mercure.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+    {{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: cpu
+        targetAverageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+    {{- end }}
+    {{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        targetAverageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    {{- end }}
+{{- end }}