mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-28 17:19:06 +00:00
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
|
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
|
||
|
|
// See page 194.
|
||
|
|
|
||
|
|
// Http3 is an e-commerce server that registers the /list and /price
|
||
|
|
// endpoints by calling (*http.ServeMux).Handle.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"log"
|
||
|
|
"net/http"
|
||
|
|
)
|
||
|
|
|
||
|
|
type dollars float32
|
||
|
|
|
||
|
|
func (d dollars) String() string { return fmt.Sprintf("$%.2f", d) }
|
||
|
|
|
||
|
|
//!+main
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
db := database{"shoes": 50, "socks": 5}
|
||
|
|
mux := http.NewServeMux()
|
||
|
|
mux.Handle("/list", http.HandlerFunc(db.list))
|
||
|
|
mux.Handle("/price", http.HandlerFunc(db.price))
|
||
|
|
log.Fatal(http.ListenAndServe("localhost:8000", mux))
|
||
|
|
}
|
||
|
|
|
||
|
|
type database map[string]dollars
|
||
|
|
|
||
|
|
func (db database) list(w http.ResponseWriter, req *http.Request) {
|
||
|
|
for item, price := range db {
|
||
|
|
fmt.Fprintf(w, "%s: %s\n", item, price)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (db database) price(w http.ResponseWriter, req *http.Request) {
|
||
|
|
item := req.URL.Query().Get("item")
|
||
|
|
price, ok := db[item]
|
||
|
|
if !ok {
|
||
|
|
w.WriteHeader(http.StatusNotFound) // 404
|
||
|
|
fmt.Fprintf(w, "no such item: %q\n", item)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
fmt.Fprintf(w, "%s\n", price)
|
||
|
|
}
|
||
|
|
|
||
|
|
//!-main
|
||
|
|
|
||
|
|
/*
|
||
|
|
//!+handlerfunc
|
||
|
|
package http
|
||
|
|
|
||
|
|
type HandlerFunc func(w ResponseWriter, r *Request)
|
||
|
|
|
||
|
|
func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) {
|
||
|
|
f(w, r)
|
||
|
|
}
|
||
|
|
//!-handlerfunc
|
||
|
|
*/
|