update

README.md

@@ -88,6 +88,7 @@ Source Code Praktek [Dasar Pemrograman Golang](https://dasarpemrogramangolang.no
      * [B.20. Custom Multiplexer](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-B.20-custom-mux-multiplexer)
      * [B.21. HTTP Cookie](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-B.21-cookie)
      * [B.22. Configuration File](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-B.22-configuration-file)
+     * [B.23. Handle Cancelled HTTP Request](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-B.23-handle-cancelled-http-request)
  * C. Pemrograman Web Golang Lanjut
      * [C.1. Echo Framework & Routing](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-C.1-echo-routing)
      * [C.2. Parsing HTTP Request Payload (Echo)](https://github.com/novalagung/dasarpemrogramangolang/tree/master/chapter-C.2-parsing-http-request-payload-echo)

chapter-B.23-handle-cancelled-http-request/1-handle-cancelled-request.go.temp

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+)
+
+func handleIndex(w http.ResponseWriter, r *http.Request) {
+	done := make(chan bool)
+	go func() {
+		// do the process here
+		// simulate a long-time request by putting 10 seconds sleep
+		time.Sleep(10 * time.Second)
+
+		done <- true
+	}()
+
+	select {
+	case <-r.Context().Done():
+		if err := r.Context().Err(); err != nil {
+			if strings.Contains(strings.ToLower(err.Error()), "canceled") {
+				log.Println("request canceled")
+			} else {
+				log.Println("unknown error occured.", err.Error())
+			}
+		}
+	case <-done:
+		log.Println("done")
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handleIndex)
+	http.ListenAndServe(":8080", nil)
+}

chapter-B.23-handle-cancelled-http-request/2-handle-cancelled-request-with-payload.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+)
+
+func handleIndex(w http.ResponseWriter, r *http.Request) {
+	done := make(chan bool)
+	go func() {
+		// do the process here
+		// simulate a long-time request by putting 10 seconds sleep
+
+		body, err := ioutil.ReadAll(r.Body)
+		_ = err
+		_ = body
+
+		time.Sleep(10 * time.Second)
+
+		done <- true
+	}()
+
+	select {
+	case <-r.Context().Done():
+		if err := r.Context().Err(); err != nil {
+			if strings.Contains(strings.ToLower(err.Error()), "canceled") {
+				log.Println("request canceled")
+			} else {
+				log.Println("unknown error occured.", err.Error())
+			}
+		}
+	case <-done:
+		log.Println("done")
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handleIndex)
+	http.ListenAndServe(":8080", nil)
+}