helm: add envoy gateway addon helm chart support

.gitignore

@@ -32,5 +32,8 @@ vendor/
 # values.yaml file is generated from its template counterpart.
 charts/gateway-helm/values.yaml
 
+# dependency charts generated by addons helm.
+charts/gateway-addons-helm/charts/
+
 # VIM
 .*.swp

charts/gateway-addons-helm/.helmignore

@@ -0,0 +1,23 @@
+# 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/gateway-addons-helm/Chart.lock

@@ -0,0 +1,9 @@
+dependencies:
+- name: prometheus
+  repository: https://prometheus-community.github.io/helm-charts
+  version: 23.1.0
+- name: grafana
+  repository: https://grafana.github.io/helm-charts
+  version: 6.58.4
+digest: sha256:d4ffdf4c4b286fd4fdebf553d4d48cf2654c8df431d75d7c22c0bfabfe1c6b15
+generated: "2024-06-02T11:28:44.08768+08:00"

charts/gateway-addons-helm/Chart.yaml

@@ -0,0 +1,33 @@
+apiVersion: v2
+name: gateway-addons-helm
+description: An Add-ons Helm chart for Envoy Gateway
+type: application
+
+version: v0.0.0-latest
+appVersion: "latest"
+icon: https://raw.githubusercontent.com/envoyproxy/gateway/main/site/assets/icons/logo.svg
+
+maintainers:
+  - name: envoy-gateway-steering-committee
+    url: https://github.com/envoyproxy/gateway/blob/main/GOVERNANCE.md
+  - name: envoy-gateway-maintainers
+    url: https://github.com/envoyproxy/gateway/blob/main/CODEOWNERS
+
+keywords:
+  - gateway-api
+  - envoyproxy
+  - envoy-gateway
+  - eg
+
+home: https://gateway.envoyproxy.io/
+
+sources:
+  - https://github.com/envoyproxy/gateway
+
+dependencies:
+  - name: prometheus
+    version: 23.1.0
+    repository: https://prometheus-community.github.io/helm-charts
+  - name: grafana
+    repository: https://grafana.github.io/helm-charts
+    version: 6.58.4

charts/gateway-addons-helm/templates/NOTES.txt

@@ -0,0 +1,20 @@
+**************************************************************************
+*** PLEASE BE PATIENT: Envoy Gateway may take a few minutes to install ***
+**************************************************************************
+
+Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway.
+
+Thank you for installing the Add-ons for Envoy Gateway! 🎉
+
+Your release is named: {{ .Release.Name }}. 🎉
+
+Your release is in namespace: {{ .Release.Namespace }}. 🎉
+
+To learn more about the release, try:
+
+  $ helm status {{ .Release.Name }} -n {{ .Release.Namespace }}
+  $ helm get all {{ .Release.Name }} -n {{ .Release.Namespace }}
+
+To have a quickstart of the Add-ons for Envoy Gateway, please refer to https://gateway.envoyproxy.io/latest/tasks/observability/.
+
+To get more details, please visit https://gateway.envoyproxy.io and https://github.com/envoyproxy/gateway.

charts/gateway-addons-helm/values.yaml

@@ -0,0 +1,39 @@
+# Values for Grafana dependency
+grafana:
+  datasources:
+    datasources.yaml:
+      apiVersion: 1
+      datasources:
+        - name: Prometheus
+          type: prometheus
+          url: http://prometheus-server
+  adminPassword: admin
+  service:
+    type: LoadBalancer
+
+# Values for Prometheus dependency
+prometheus:
+  # To simplify the deployment, disable non-essential components
+  alertmanager:
+    enabled: false
+  prometheus-pushgateway:
+    enabled: false
+  kube-state-metrics:
+    enabled: false
+  prometheus-node-exporter:
+    enabled: false
+  server:
+    fullnameOverride: prometheus
+    persistentVolume:
+      enabled: false
+    readinessProbeInitialDelay: 0
+    global:
+      # Speed up scraping a bit from the default
+      scrape_interval: 15s
+    service:
+      # use LoadBalancer to expose prometheus
+      type: LoadBalancer
+    # use dockerhub
+    image:
+      repository: prom/prometheus
+    securityContext: null

examples/prometheus/helm-values.yaml

@@ -22,4 +22,3 @@ server:
   image:
     repository: prom/prometheus
   securityContext: null
-

tools/make/helm.mk

@@ -1,35 +1,77 @@
 # This is a wrapper to manage helm chart
 #
-# All make targets related to helmß are defined in this file.
+# All make targets related to helms are defined in this file.
 
 include tools/make/env.mk
 
+CHARTS := $(wildcard charts/*)
+
 IMAGE_PULL_POLICY ?= IfNotPresent
 OCI_REGISTRY ?= oci://docker.io/envoyproxy
 CHART_NAME ?= gateway-helm
 CHART_VERSION ?= ${RELEASE_VERSION}
+RELEASE_NAMESPACE ?= envoy-gateway-system
 
 ##@ Helm
+.PHONY: helm-package
+helm-package: ## Package envoy gateway relevant helm charts.
 helm-package:
-helm-package: ## Package envoy gateway helm chart.
-helm-package: helm-generate
-	@$(LOG_TARGET)
+	@for chart in $(CHARTS); do \
+    	$(LOG_TARGET); \
+      	$(MAKE) $(addprefix helm-package., $$(basename $${chart})); \
+	done
+
+.PHONY: helm-package.%
+helm-package.%: helm-generate.%
+	$(eval COMMAND := $(word 1,$(subst ., ,$*)))
+	$(eval CHART_NAME := $(COMMAND))
 	helm package charts/${CHART_NAME} --app-version ${TAG} --version ${CHART_VERSION} --destination ${OUTPUT_DIR}/charts/
 
+.PHONY: helm-push
+helm-push: ## Push envoy gateway relevant helm charts to OCI registry.
 helm-push:
-helm-push: ## Push envoy gateway helm chart to OCI registry.
-	@$(LOG_TARGET)
+	@for chart in $(CHARTS); do \
+		$(LOG_TARGET); \
+		$(MAKE) $(addprefix helm-push., $$(basename $${chart})); \
+	done
+
+.PHONY: helm-push.%
+helm-push.%: helm-package.%
+	$(eval COMMAND := $(word 1,$(subst ., ,$*)))
+	$(eval CHART_NAME := $(COMMAND))
 	helm push ${OUTPUT_DIR}/charts/${CHART_NAME}-${CHART_VERSION}.tgz ${OCI_REGISTRY}
 
+.PHONY: helm-install
+helm-install: ## Install envoy gateway relevant helm charts from OCI registry.
 helm-install:
-helm-install: helm-generate ## Install envoy gateway helm chart from OCI registry.
-	@$(LOG_TARGET)
-	helm install eg ${OCI_REGISTRY}/${CHART_NAME} --version ${CHART_VERSION} -n envoy-gateway-system --create-namespace
+	@for chart in $(CHARTS); do \
+		$(LOG_TARGET); \
+		$(MAKE) $(addprefix helm-install., $$(basename $${chart})); \
+	done
+
+.PHONY: helm-install.%
+helm-install.%: helm-generate.%
+	$(eval COMMAND := $(word 1,$(subst ., ,$*)))
+	$(eval CHART_NAME := $(COMMAND))
+	helm install eg ${OCI_REGISTRY}/${CHART_NAME} --version ${CHART_VERSION} -n ${RELEASE_NAMESPACE} --create-namespace
 
 .PHONY: helm-generate
 helm-generate:
-	GatewayImage=${IMAGE}:${TAG} GatewayImagePullPolicy=${IMAGE_PULL_POLICY} envsubst < charts/gateway-helm/values.tmpl.yaml > ./charts/gateway-helm/values.yaml
-	helm lint charts/gateway-helm
+	@for chart in $(CHARTS); do \
+  		$(LOG_TARGET); \
+  		$(MAKE) $(addprefix helm-generate., $$(basename $${chart})); \
+  	done
+
+.PHONY: helm-generate.%
+helm-generate.%:
+	$(eval COMMAND := $(word 1,$(subst ., ,$*)))
+	$(eval CHART_NAME := $(COMMAND))
+	@if test -f "charts/${CHART_NAME}/values.tmpl.yaml"; then \
+  		GatewayImage=${IMAGE}:${TAG} GatewayImagePullPolicy=${IMAGE_PULL_POLICY} \
+  		envsubst < charts/${CHART_NAME}/values.tmpl.yaml > ./charts/${CHART_NAME}/values.yaml; \
+  	fi
+	helm lint charts/${CHART_NAME}
+	helm dependency update charts/${CHART_NAME} # Update dependencies for add-ons chart.
 
 HELM_VALUES := $(wildcard test/helm/*.in.yaml)
 
@@ -38,5 +80,5 @@ helm-template: ## Template envoy gateway helm chart.z
 	@for file in $(HELM_VALUES); do \
   		filename=$$(basename $${file}); \
   		output="$${filename%.in.*}.out.yaml"; \
-		helm template eg charts/gateway-helm -f $${file} > test/helm/$$output --namespace=envoy-gateway-system; \
+		helm template eg charts/${CHART_NAME} -f $${file} > test/helm/$$output --namespace=${RELEASE_NAMESPACE}; \
 	done