Golang微服務開發可以實現哪些核心業務功能?
隨著雲端運算和容器技術的快速發展,微服務架構成為了現代應用開發的主流趨勢之一。而Golang作為一種高效、可靠且具有並發特性的程式語言,成為了建構微服務的理想選擇。
在Golang微服務開發中,我們可以實現以下核心業務功能:
package main import ( "fmt" "log" "net/http" ) func main() { http.HandleFunc("/hello", helloHandler) log.Fatal(http.ListenAndServe(":8080", nil)) } func helloHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, "Hello, World!") }
package main import ( "database/sql" "fmt" "log" _ "github.com/go-sql-driver/mysql" ) func main() { db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/database") if err != nil { log.Fatal(err) } defer db.Close() rows, err := db.Query("SELECT * FROM users") if err != nil { log.Fatal(err) } defer rows.Close() for rows.Next() { var id int var name string err = rows.Scan(&id, &name) if err != nil { log.Fatal(err) } fmt.Println(id, name) } }
package main import ( "log" "github.com/streadway/amqp" ) func main() { conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/") if err != nil { log.Fatal(err) } defer conn.Close() ch, err := conn.Channel() if err != nil { log.Fatal(err) } defer ch.Close() q, err := ch.QueueDeclare( "hello", false, false, false, false, nil, ) if err != nil { log.Fatal(err) } err = ch.Publish( "", q.Name, false, false, amqp.Publishing{ ContentType: "text/plain", Body: []byte("Hello, RabbitMQ!"), }, ) if err != nil { log.Fatal(err) } }
package main import ( "fmt" "log" "net/http" "github.com/dgrijalva/jwt-go" ) var jwtKey = []byte("secret_key") type Claims struct { Username string `json:"username"` jwt.StandardClaims } func main() { http.HandleFunc("/login", loginHandler) http.HandleFunc("/protected", authMiddleware(protectedHandler)) log.Fatal(http.ListenAndServe(":8080", nil)) } func loginHandler(w http.ResponseWriter, r *http.Request) { username := r.FormValue("username") password := r.FormValue("password") if username == "admin" && password == "admin" { token := jwt.NewWithClaims(jwt.SigningMethodHS256, Claims{ Username: username, }) tokenString, err := token.SignedString(jwtKey) if err != nil { log.Fatal(err) } fmt.Fprintln(w, tokenString) } else { w.WriteHeader(http.StatusUnauthorized) fmt.Fprintln(w, "Username or password incorrect") } } func protectedHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, "Protected resource") } func authMiddleware(next http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { tokenString := r.Header.Get("Authorization") token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) { return jwtKey, nil }) if claims, ok := token.Claims.(*Claims); ok && token.Valid { fmt.Println(claims.Username) next(w, r) } else { w.WriteHeader(http.StatusUnauthorized) fmt.Fprintln(w, "Unauthorized") } } }
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