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book_with_bridge/http/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.25.5

book_with_bridge/http/main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"html/template"
+)
+
+type rub float64
+
+func (r rub) String() string {
+	return fmt.Sprintf("%.2f",r)
+}
+
+var tmpl *template.Template
+
+
+func Render(w http.ResponseWriter, req *http.Request) {
+	err := tmpl.Execute(w,req)
+	if err != nil {
+		http.Error(w,err.Error(),http.StatusInternalServerError)
+	}
+}
+
+type database map[string]rub
+
+type List struct {
+	Items database
+}
+
+func (db *database) list(w http.ResponseWriter, req *http.Request) {
+	data := List{
+		Items: *db,
+	}
+
+	err := tmpl.ExecuteTemplate(w,"template.html",data)
+	if err != nil {
+		http.Error(w,err.Error(),http.StatusInternalServerError)
+	}
+}
+
+func (db *database) price(w http.ResponseWriter,req *http.Request) {
+	item := req.URL.Query().Get("item")
+	v,ok := (*db)[item]
+	if !ok {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprintf(w,"%s not found in goods list",item)
+		return
+	}
+	fmt.Fprintf(w,"Price of %s is %s",item,v)
+}
+
+func (db *database) update(w http.ResponseWriter, req *http.Request) {
+	item := req.URL.Query().Get("item")
+	price := req.URL.Query().Get("price")
+	f,err := strconv.ParseFloat(price,2)
+	if err != nil {
+		log.Fatal(err)
+	}
+	(*db)[item] = rub(f)
+	fmt.Fprintf(w,"item %s and price %s",item,(*db)[item])
+}
+
+// func (db database) ServeHTTP(w http.ResponseWriter, r *http.Request ) {
+// 	switch r.URL.Path {
+// 	case "/list":
+// 		for k,v := range db {
+// 			fmt.Fprintf(w,"%s costs %s rub\n",k,v)
+// 		}
+// 	case "/price":
+// 		item := r.URL.Query().Get("item")
+// 		v,ok := db[item]
+// 		if !ok {
+// 			w.WriteHeader(http.StatusNotFound)
+// 			fmt.Fprintf(w,"%s not found in goods list",item)
+// 			return
+// 		}
+// 		fmt.Fprintf(w,"Price of %s is %s",item,v)
+// 	}
+// }
+
+func main()  {
+	db := database{
+		"sneakers": 10.0,
+		"boots": 20,
+		}
+	// mux.Handle("/list",http.HandlerFunc(db.list))
+	// mux.Handle("/price",http.HandlerFunc(db.price))
+	tmpl = template.Must(template.ParseFiles("template.html"))
+	http.HandleFunc("/list",db.list)
+	http.HandleFunc("/price",db.price)
+	http.HandleFunc("/update",db.update)
+	log.Fatal(http.ListenAndServe(":9090",nil))
+}

book_with_bridge/http/template.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>TABLE</title>
+    <style>
+        body { font-family: Arial, sans-serif; margin: 40px; }
+        .header { background: #3498db; color: white; padding: 20px; border-radius: 8px; }
+        .content { margin: 20px 0; }
+        table { width: 100%; border-collapse: collapse; }
+        th, td { padding: 10px; border: 1px solid #ddd; text-align: left; }
+        th { background: #f4f4f4; }
+        .price { text-align: right; font-weight: bold; color: #27ae60; }
+        .total { background: #ecf0f1; font-weight: bold; }
+    </style>
+</head>
+<body>
+    
+    <div class="content">
+        <h2>Items</h2>
+        <table>
+            <tr>
+                <th>Item Name</th>
+                <th>Price</th>
+            </tr>
+            {{range $key, $value := .Items}}
+            <tr>
+                <td>{{$key}}</td>
+                <td class="price">{{$value.String}}</td>
+            </tr>
+            {{end}}
+        </table>
+    </div>
+</body>
+</html>