Login light
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/

// See page 191.

// Http1 is a rudimentary e-commerce server.
package main

import (
    "fmt"
    "log"
    "net/http"
)

//!+main

func main() {
    db := database{"shoes": 50, "socks": 5}
    log.Fatal(http.ListenAndServe("localhost:8000", db))
}

type dollars float32

func (d dollars) String() string { return fmt.Sprintf("$%.2f", d) }

type database map[string]dollars

func (db database) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    for item, price := range db {
        fmt.Fprintf(w, "%s: %s\n", item, price)
    }
}

//!-main

/*
//!+handler
package http

type Handler interface {
    ServeHTTP(w ResponseWriter, r *Request)
}

func ListenAndServe(address string, h Handler) error
//!-handler
*/