Switch to docker on CloudRun, name from golang to go

Author: fileformat

.air.toml

@@ -0,0 +1,32 @@
+root = "."
+tmp_dir = "tmp"
+
+[build]
+  bin = "./tmp/main"
+  cmd = "go build -o ./tmp/main ."
+  delay = 1000
+  exclude_dir = ["tmp"]
+  exclude_file = []
+  exclude_regex = []
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tmpl"]
+  kill_delay = "0s"
+  log = "build-errors.log"
+  send_interrupt = false
+  stop_on_error = true
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  time = false
+
+[misc]
+  clean_on_exit = false

.dockerignore

@@ -0,0 +1,8 @@
+.air.toml
+.DS_Store
+.git
+.github
+*.md
+*.sh
+*.tmp
+tmp*

.github/workflows/appengine-deploy.yaml

@@ -0,0 +1,64 @@
+name: deploy
+
+on:
+  push:
+    branches:
+    - main
+
+  workflow_dispatch:
+
+# Environment variables available to all jobs and steps in this workflow
+# NOTE: these aren't really secret, but there aren't non-secret settings
+env:
+  RUN_PROJECT: ${{ secrets.RUN_PROJECT }}
+  RUN_REGION: ${{ secrets.RUN_REGION }}
+  RUN_SERVICE: ${{ secrets.RUN_SERVICE }}
+
+jobs:
+  deploy:
+    name: Deploy to CloudRun
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: gcloud auth
+        id: 'auth'
+        uses: 'google-github-actions/auth@v2'
+        with:
+          credentials_json: '${{ secrets.GCP_SA_KEY }}'
+
+      # Setup gcloud CLI
+      - name: gcloud setup
+        uses: google-github-actions/setup-gcloud@v2
+
+      - name: gcloud docker-auth
+        run: gcloud auth configure-docker
+
+      # Build and push image to Google Container Registry
+      - name: Build
+        run: |
+          docker build \
+            --build-arg COMMIT=${GITHUB_SHA:0:7} \
+            --build-arg LASTMOD=$(date -u +%Y-%m-%dT%H:%M:%SZ) \
+            --tag gcr.io/${RUN_PROJECT}/${RUN_SERVICE}:$GITHUB_SHA \
+            .
+
+      - name: GCloud auth to docker
+        run: |
+          gcloud auth configure-docker
+
+      - name: Push to registry
+        run: |
+          docker push gcr.io/${RUN_PROJECT}/${RUN_SERVICE}:$GITHUB_SHA
+
+      # Deploy image to Cloud Run
+      - name: Deploy
+        run: |
+          gcloud run deploy ${RUN_SERVICE} \
+            --allow-unauthenticated \
+            --image gcr.io/${RUN_PROJECT}/${RUN_SERVICE}:$GITHUB_SHA \
+            --platform managed \
+            --project ${RUN_PROJECT} \
+            --region ${RUN_REGION}

.github/workflows/gcr-deploy.yaml

@@ -0,0 +1,24 @@
+# syntax=docker/dockerfile:1
+FROM golang:1.23-alpine AS builder
+RUN apk update && \
+    apk upgrade && \
+    apk --no-cache add git
+RUN mkdir /build
+ADD . /build/
+WORKDIR /build
+ARG COMMIT
+ARG LASTMOD
+RUN echo "INFO: building for $COMMIT on $LASTMOD"
+RUN \
+    CGO_ENABLED=0 GOOS=linux go build \
+    -a \
+    -installsuffix cgo \
+    -ldflags "-X main.COMMIT=$COMMIT -X main.LASTMOD=$LASTMOD -extldflags '-static'" \
+    -o regexplanet-go *.go
+
+FROM scratch
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /build/regexplanet-go /app/
+WORKDIR /app
+ENV PORT=4000
+ENTRYPOINT ["./regexplanet-go"]

Dockerfile

@@ -1,4 +1,6 @@
-# regexplanet-golang
+# regexplanet-go
+
+[![build](https://github.com/regexplanet/regexplanet-go/actions/workflows/gcr-deploy.yaml/badge.svg)](https://github.com/regexplanet/regexplanet-go/actions/workflows/gcr-deploy.yaml)
 
 This is the [Go language](http://www.golang.org/) backend for RegexPlanet, a tool for online regular expression testing.
 

README.md

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# run locally but in docker
+
+set -o errexit
+set -o pipefail
+set -o nounset
+
+docker build -t regexplanet-go .
+docker run \
+	--publish 4000:4000 \
+	--expose 4000 \
+	--env PORT='4000' \
+	--env COMMIT=$(git rev-parse --short HEAD) \
+	--env LASTMOD=$(date -u +%Y-%m-%dT%H:%M:%SZ) \
+	regexplanet-go

app.yaml

@@ -1,3 +1,3 @@
 module github.com/regexplanet/regexplanet-go
 
-go 1.22
+go 1.23

docker-run.sh

@@ -0,0 +1,8 @@
+package main
+
+import (
+	"log/slog"
+	"os"
+)
+
+var logger = slog.New(slog.NewJSONHandler(os.Stdout, nil))

go.mod

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"html"
-	"log"
 	"net/http"
 	"os"
 	"regexp"
@@ -15,7 +14,8 @@ import (
 )
 
 func root_handler(w http.ResponseWriter, r *http.Request) {
-	http.Redirect(w, r, "https://www.regexplanet.com/advanced/golang/index.html", http.StatusFound)
+	w.Header().Set("Content-Type", "text/plain; charset=utf8")
+	w.Write([]byte("Running " + runtime.Version()))
 }
 
 func write_with_callback(w http.ResponseWriter, callback string, v interface{}) {
@@ -305,17 +305,22 @@ func test_handler(w http.ResponseWriter, r *http.Request) {
 
 func main() {
 
-	http.HandleFunc("/", root_handler)
+	http.HandleFunc("/{$}", root_handler)
 	http.HandleFunc("/status.json", status_handler)
 	http.HandleFunc("/test.json", test_handler)
+	http.HandleFunc("/robots.txt", staticHandler.ServeHTTP)
+	http.HandleFunc("/favicon.ico", staticHandler.ServeHTTP)
+	http.HandleFunc("/favicon.svg", staticHandler.ServeHTTP)
+
+	var listenAddress = os.Getenv("ADDRESS")
 
-	port := os.Getenv("PORT")
-	if port == "" {
-		port = "4000"
+	var listenPort, portErr = strconv.Atoi(os.Getenv("PORT"))
+	if portErr != nil {
+		listenPort = 4000
 	}
 
-	log.Printf("Listening on port %s", port)
-	if err := http.ListenAndServe(":"+port, nil); err != nil {
-		log.Fatal(err)
+	logger.Info("Listening", "address", listenAddress, "port", listenPort)
+	if err := http.ListenAndServe(listenAddress+":"+strconv.Itoa(listenPort), nil); err != nil {
+		logger.Error("unable to listen", "address", listenAddress, "port", listenPort, "error", err)
 	}
 }

logger.go

@@ -1,3 +1,14 @@
-#!/bin/bash
+#!/usr/bin/env bash
+#
+# run locally
+#
 
-go run src/regexplanet.go
+set -o errexit
+set -o pipefail
+set -o nounset
+
+if [ -f ".env" ]; then
+	export $(cat .env)
+fi
+
+~/go/bin/air

main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"embed"
+	"io/fs"
+	"net/http"
+)
+
+//go:embed static
+var embeddedFiles embed.FS
+var staticHandler = initStaticHandler()
+
+func initStaticHandler() http.Handler {
+
+	fsys, err := fs.Sub(embeddedFiles, "static")
+	if err != nil {
+		logger.Error("unable to create static file system", "error", err)
+		panic(err)
+	}
+
+	return http.FileServer(http.FS(fsys))
+}