add chapter 15.5 (#681)

2025-08-12 04:48:29 +08:00 · 2019-07-16 10:56:27 +08:00
parent c1eb170a8c
commit 0584651404
5 changed files with 158 additions and 4 deletions
--- a/eBook/examples/chapter_15/robust_webserver.go
+++ b/eBook/examples/chapter_15/robust_webserver.go
@@ -0,0 +1,56 @@
+// robust_webserver.go
+package main
+
+import (
+	"net/http"
+	"io"
+	"log"
+)
+
+const form = `<html><body><form action="#" method="post" name="bar">
+		<input type="text" name="in"/>
+		<input type="submit" value="Submit"/>
+	</form></html></body>`
+
+type HandleFnc func(http.ResponseWriter, *http.Request)
+
+/* handle a simple get request */
+func SimpleServer(w http.ResponseWriter, request *http.Request) {
+	io.WriteString(w, "<h1>hello, world</h1>")
+}
+
+/* handle a form, both the GET which displays the form
+   and the POST which processes it.*/
+func FormServer(w http.ResponseWriter, request *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	switch request.Method {
+	case "GET":
+		/* display the form to the user */
+		io.WriteString(w, form)
+	case "POST":
+		/* handle the form data, note that ParseForm must
+		   be called before we can extract form data*/
+		//request.ParseForm();
+		//io.WriteString(w, request.Form["in"][0])
+		io.WriteString(w, request.FormValue("in"))
+	}
+}
+
+func main() {
+	http.HandleFunc("/test1", logPanics(SimpleServer))
+	http.HandleFunc("/test2", logPanics(FormServer))
+	if err := http.ListenAndServe(":8088", nil); err != nil {
+		panic(err)
+	}
+}
+
+func logPanics(function HandleFnc) HandleFnc {
+	return func(writer http.ResponseWriter, request *http.Request) {
+		defer func() {
+			if x := recover(); x != nil {
+				log.Printf("[%v] caught panic: %v", request.RemoteAddr, x)
+			}
+		}()
+		function(writer, request)
+	}
+}