start rewrite app in go

Signed-off-by: Charly Molter <[email protected]>

.github/workflows/ci.yaml

@@ -0,0 +1,20 @@
+on: # yamllint disable-line rule:truthy
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+      - next
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - run: curl https://mise.run | sh
+      - run: make check
+      - run: make build
+      - run: make test

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 .idea
+bin/
+dist/

.golangci.yaml

@@ -0,0 +1,3 @@
+---
+issues:
+  exclude-rules:

.goreleaser.yaml

@@ -0,0 +1,48 @@
+---
+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+
+# The lines below are called `modelines`. See `:help modeline`
+# Feel free to remove those if you don't want/need to use them.
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# vim: set ts=2 sw=2 tw=0 fo=cnqoj
+
+version: 2
+
+before:
+  hooks:
+    - make generate
+    - make check
+
+builds:
+  - env:
+      - CGO_ENABLED=0
+    main: ./app
+    id: kuma-counter-demo
+    goos:
+      - linux
+      - darwin
+
+archives:
+  - format: tar.gz
+    # this name template makes the OS and Arch compatible with the results of `uname`.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+
+dockers:
+  - id: demo-app
+    image_templates:
+      - kumahq/kuma-counter-demo
+    dockerfile: ./app/Dockerfile

.mise.toml

@@ -0,0 +1,5 @@
+[env]
+MISE_DATA_DIR='bin/'
+
+[settings]
+experimental = true # To enable installation of Go tools from source with mise.

.tools_versions.yaml

@@ -0,0 +1,7 @@
+---
+# renovate: datasource=github-releases depName=golangci/golangci-lint
+golangci-lint: 1.61.0
+# removate: datasource=github-releases depName=github.com/goreleaser/goreleaser/v2
+goreleaser: 2.3.2
+# removate: datasource=github-releases denName=com/oapi-codegen/oapi-codegen/v2/cmd/oapi-codegen
+oapi-codegen: 2.4.1

Dockerfile

@@ -1,16 +1,8 @@
 ARG ARCH=amd64
-FROM --platform=linux/${ARCH} node:alpine
+FROM golang:1.19
 
-RUN apk add dumb-init
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH} go build ./... -o /kuma-counter-demo
 
-COPY /app/package.json /app/package.json
-RUN npm install --prefix /app
+FROM --platform=linux/${ARCH} distroless
 
-COPY /app/public /app/public
-COPY /app/server.js /app/server.js
-
-EXPOSE 5000
-
-WORKDIR "/app"
-ENTRYPOINT ["dumb-init", "--"]
-CMD ["node", "./server.js"]
+CMD ["/kuma-counter-demo"]

ERRORS.md

@@ -0,0 +1,11 @@
+# Errors
+
+The list of error details that can be returned by our app.
+
+## REDIS-FAILURE
+
+Redis failed in some way
+
+## DEMOAPP-FAILURE
+
+Demo-app failed

Makefile

@@ -0,0 +1,71 @@
+# Some sensible Make defaults: https://tech.davis-hansson.com/p/make/
+SHELL := bash
+.SHELLFLAGS := -eu -o pipefail -c
+
+PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
+TOOLS_VERSIONS_FILE = $(PROJECT_DIR)/.tools_versions.yaml
+
+export MISE_DATA_DIR = $(PROJECT_DIR)/bin/
+MISE := $(shell which mise)
+.PHONY: mise
+mise:
+	@mise -V >/dev/null || (echo "mise - https://github.com/jdx/mise - not found. Please install it." && exit 1)
+
+GOLANGCI_LINT_VERSION = $(shell yq -ojson -r '.golangci-lint' < $(TOOLS_VERSIONS_FILE))
+GOLANGCI_LINT = $(PROJECT_DIR)/bin/installs/golangci-lint/$(GOLANGCI_LINT_VERSION)/bin/golangci-lint
+.PHONY: golangci-lint.download
+golangci-lint.download: | mise ## Download golangci-lint locally if necessary.
+	$(MISE) install -y -q golangci-lint@$(GOLANGCI_LINT_VERSION)
+
+GORELEASER_VERSION = $(shell yq -ojson -r '.goreleaser' < $(TOOLS_VERSIONS_FILE))
+GORELEASER = $(PROJECT_DIR)/bin/installs/goreleaser/$(GORELEASER_VERSION)/bin/goreleaser
+.PHONY: goreleaser.download
+goreleaser.download: | mise ## Download goreleaser locally if necessary.
+	$(MISE) install -y -q goreleaser@$(GORELEASER_VERSION)
+
+OAPI_CODEGEN_VERSION = $(shell yq -ojson -r '.oapi-codegen' < $(TOOLS_VERSIONS_FILE))
+OAPI_CODEGEN = $(PROJECT_DIR)/bin/installs/oapi-codegen/$(OAPI_CODEGEN_VERSION)/bin/oapi-codegen
+.PHONY: oapi-codegen.download
+oapi-codegen.download: | mise ## Download oapi-codegen locally if necessary.
+	$(MISE) install -y -q oapi-codegen@$(OAPI_CODEGEN_VERSION)
+
+app/internal/api/gen.go: openapi.yaml | oapi-codegen.download
+	$(OAPI_CODEGEN) --config openapi-config.yaml $<
+
+.PHONY: clean
+clean:
+	@rm -rf app/internal/api/gen.go
+	@rm -rf dist/
+	@rm -rf bin/
+
+.PHONY: all
+all: check build test run
+
+.PHONY: check
+check: tidy fmt lint
+
+.PHONY: fmt
+fmt:
+	go fmt ./...
+
+.PHONY: lint
+lint: tidy golangci-lint
+
+.PHONY: tidy
+tidy:
+	go mod tidy
+
+.PHONY: golangci-lint
+golangci-lint: | golangci-lint.download
+	$(GOLANGCI_LINT) run --verbose --config $(PWD)/.golangci.yaml $(GOLANGCI_LINT_FLAGS)
+
+build: | goreleaser.download
+	$(GORELEASER) release --snapshot --clean
+
+.PHONY: generate
+generate: app/internal/api/gen.go
+	go generate ./...
+
+.PHONY: test
+test:
+	go test $$(go list ./... | grep -v 'e2e')

README.md

@@ -1,5 +1,7 @@
 # Kuma Counter Demo
 
+[![Run in Insomnia}](https://insomnia.rest/images/run.svg)](https://insomnia.rest/run/?label=Kuma-count-demo&uri=https%3A%2F%2Fgithub.com%2Fkumahq%2Fkuma-counter-demo%2Fblob%2Fmaster%2Fopenapi.yaml)
+
 [![][kuma-logo]][kuma-url]
 
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/kumahq/kuma/blob/master/LICENSE)
@@ -201,4 +203,8 @@ To enforce response status code you need to set header `x-set-response-status-co
 
 ```shell
 curl localhost:5001/increment -XPOST -H "x-set-response-status-code: 503"
-```
+```
+
+### ErrorCodes
+
+#### Error Redis failure

app/Dockerfile

@@ -0,0 +1,4 @@
+FROM scratch
+
+ENTRYPOINT ["/kuma-counter-demo"]
+ADD kuma-counter-demo /