add mysql-blog-server example

.gitignore

@@ -1,4 +1,5 @@
 dist
 build
 node_modules
-.wrangler
+.wrangler
+.dev.vars

_examples/mysql-blog-server/.dev.vars.example

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+MYSQL_DSN=user:pass@tcp(hostname)/database-name?interpolateParams=true

_examples/mysql-blog-server/.gitignore

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+build
+node_modules
+.wrangler

_examples/mysql-blog-server/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run ../../cmd/workers-assets-gen -mode=go
+	GOOS=js GOARCH=wasm go build -o ./build/app.wasm .
+
+.PHONY: deploy
+deploy:
+	wrangler deploy

_examples/mysql-blog-server/README.md

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+# mysql-blog-server
+
+* A simple Blog server implemented in Go.
+* This example is using MySQL.
+
+# WIP
+
+### Create blog post
+
+```
+$ curl -X POST 'http://localhost:8787/articles' \
+-H 'Content-Type: application/json' \
+-d '{
+  "title":"example post",
+  "body":"body of the example post"
+}'
+{
+  "article": {
+    {
+      "id": "f9e8119e-881e-4dc5-9307-af4f2dc79891",
+      "title": "example post",
+      "body": "body of the example post",
+      "createdAt": 1677382874
+    }
+  }
+}
+```
+
+### List blog posts
+
+```
+$ curl 'http://localhost:8787/articles'
+{
+  "articles": [
+    {
+      "id": "bea6cd80-5a83-45f0-b061-0e13a2ad5fba",
+      "title": "example post 2",
+      "body": "body of the example post 2",
+      "createdAt": 1677383758
+    },
+    {
+      "id": "f9e8119e-881e-4dc5-9307-af4f2dc79891",
+      "title": "example post",
+      "body": "body of the example post",
+      "createdAt": 1677382874
+    }
+  ]
+}
+```
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* go
+
+### Setup MySQL DB
+
+* This project requires MySQL DB.
+  - Connection setting: `.dev.vars.example` (please rename to `.dev.vars`.)
+  - Initial migration SQL: `schema.sql`
+* If you want to deploy this app to production, please set `MYSQL_DSN` to your Worker secrets.
+  - Run: `npx wrangler secret put MYSQL_DSN`.
+
+### Commands
+
+```
+make dev    # run dev server
+make build  # build Go Wasm binary
+make deploy # deploy worker
+```

_examples/mysql-blog-server/app/handler.go

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+package app
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/go-sql-driver/mysql"
+	"github.com/syumai/workers/_examples/mysql-blog-server/app/model"
+	"github.com/syumai/workers/cloudflare"
+	"github.com/syumai/workers/cloudflare/sockets"
+)
+
+type articleHandler struct{}
+
+var _ http.Handler = (*articleHandler)(nil)
+
+func NewArticleHandler() http.Handler {
+	return &articleHandler{}
+}
+
+func (h *articleHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	// initialize DB.
+	mysql.RegisterDialContext("tcp", func(_ context.Context, addr string) (net.Conn, error) {
+		return sockets.Connect(req.Context(), addr, &sockets.SocketOptions{
+			SecureTransport: sockets.SecureTransportOff,
+		})
+	})
+	db, err := sql.Open("mysql",
+		cloudflare.Getenv(req.Context(), "MYSQL_DSN"))
+	if err != nil {
+		log.Fatalf("failed to connect: %v", err)
+	}
+
+	switch req.Method {
+	case http.MethodGet:
+		h.listArticles(w, req, db)
+		return
+	case http.MethodPost:
+		h.createArticle(w, req, db)
+		return
+	}
+	w.WriteHeader(http.StatusNotFound)
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte("not found"))
+}
+
+func (h *articleHandler) handleErr(w http.ResponseWriter, status int, msg string) {
+	w.WriteHeader(status)
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte(msg))
+}
+
+func (h *articleHandler) createArticle(w http.ResponseWriter, req *http.Request, db *sql.DB) {
+	var createArticleReq model.CreateArticleRequest
+	if err := json.NewDecoder(req.Body).Decode(&createArticleReq); err != nil {
+		h.handleErr(w, http.StatusBadRequest,
+			"request format is invalid")
+		return
+	}
+
+	now := time.Now().Unix()
+	article := model.Article{
+		Title:     createArticleReq.Title,
+		Body:      createArticleReq.Body,
+		CreatedAt: uint64(now),
+	}
+
+	result, err := db.Exec(`
+INSERT INTO articles (title, body, created_at)
+VALUES (?, ?, ?)
+   `, article.Title, article.Body, article.CreatedAt)
+	if err != nil {
+		log.Println(err)
+		h.handleErr(w, http.StatusInternalServerError,
+			"failed to save article")
+		return
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		log.Println(err)
+		h.handleErr(w, http.StatusInternalServerError,
+			"failed to get ID of inserted article")
+		return
+	}
+	article.ID = uint64(id)
+
+	res := model.CreateArticleResponse{
+		Article: article,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(res); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to encode response: %w\n", err)
+	}
+}
+
+func (h *articleHandler) listArticles(w http.ResponseWriter, req *http.Request, db *sql.DB) {
+	rows, err := db.Query(`
+SELECT id, title, body, created_at FROM articles
+ORDER BY created_at DESC;
+   `)
+	if err != nil {
+		h.handleErr(w, http.StatusInternalServerError,
+			"failed to load article")
+		return
+	}
+
+	articles := []model.Article{}
+	for rows.Next() {
+		var a model.Article
+		err = rows.Scan(&a.ID, &a.Title, &a.Body, &a.CreatedAt)
+		if err != nil {
+			log.Println(err)
+			h.handleErr(w, http.StatusInternalServerError,
+				"failed to scan article")
+			return
+		}
+		articles = append(articles, a)
+	}
+	res := model.ListArticlesResponse{
+		Articles: articles,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(res); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to encode response: %w\n", err)
+	}
+}

_examples/mysql-blog-server/app/model/article.go

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+package model
+
+type Article struct {
+	ID        uint64 `json:"id"`
+	Title     string `json:"title"`
+	Body      string `json:"body"`
+	CreatedAt uint64 `json:"createdAt"`
+}
+
+type CreateArticleRequest struct {
+	Title string `json:"title"`
+	Body  string `json:"body"`
+}
+
+type CreateArticleResponse struct {
+	Article Article `json:"article"`
+}
+
+type ListArticlesResponse struct {
+	Articles []Article `json:"articles"`
+}

_examples/mysql-blog-server/go.mod

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+module github.com/syumai/workers/_examples/mysql-blog-server
+
+go 1.21.3
+
+require (
+	github.com/go-sql-driver/mysql v1.7.1
+	github.com/syumai/workers v0.9.0
+)
+
+replace github.com/syumai/workers => ../../

_examples/mysql-blog-server/go.sum

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+github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
+github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=

_examples/mysql-blog-server/main.go

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+package main
+
+import (
+	"net/http"
+
+	"github.com/syumai/workers"
+	"github.com/syumai/workers/_examples/mysql-blog-server/app"
+)
+
+func main() {
+	http.Handle("/articles", app.NewArticleHandler())
+	workers.Serve(nil) // use http.DefaultServeMux
+}

_examples/mysql-blog-server/schema.sql

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+DROP TABLE IF EXISTS articles;
+CREATE TABLE IF NOT EXISTS articles (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    title TEXT NOT NULL,
+    body TEXT NOT NULL,
+    created_at INT NOT NULL
+);
+CREATE INDEX idx_articles_on_created_at ON articles (created_at DESC);
+INSERT INTO articles (title, body, created_at) VALUES (
+    'title of example post',
+    'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.',
+    UNIX_TIMESTAMP()
+);

_examples/mysql-blog-server/wrangler.toml

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+name = "mysql-blog-server"
+main = "./build/worker.mjs"
+compatibility_date = "2024-01-03"
+
+[build]
+command = "make build"