Golang函数的rpc和restful的应用方法

package main

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

type Args struct {
    A, B int
}

type Result struct {
    Value int
}

type Math struct {}

func (m *Math) Multiply(args *Args, result *Result) error {
    result.Value = args.A * args.B
    return nil
}

func main() {
    math := new(Math)
    rpc.Register(math)
    l, e := net.Listen("tcp", ":1234")
    if e != nil {
        log.Fatal("listen error:", e)
    }
    for {
        conn, err := l.Accept()
        if err != nil {
            log.Fatal(err)
        }
        go rpc.ServeConn(conn)
    }
}

package main

import (
    "encoding/json"
    "log"
    "net/http"

    "github.com/gorilla/mux"
)

type Todo struct {
    ID        string `json:"id,omitempty"`
    Title     string `json:"title,omitempty"`
    Completed bool   `json:"completed,omitempty"`
}

var todos []Todo

func GetTodos(w http.ResponseWriter, r *http.Request) {
    json.NewEncoder(w).Encode(todos)
}

func AddTodo(w http.ResponseWriter, r *http.Request) {
    var todo Todo
    _ = json.NewDecoder(r.Body).Decode(&todo)
    todos = append(todos, todo)
    json.NewEncoder(w).Encode(todo)
}

func main() {
    router := mux.NewRouter()

    todos = append(todos, Todo{ID: "1", Title: "Todo 1", Completed: false})
    todos = append(todos, Todo{ID: "2", Title: "Todo 2", Completed: true})

    router.HandleFunc("/todos", GetTodos).Methods("GET")
    router.HandleFunc("/todos", AddTodo).Methods("POST")

    log.Fatal(http.ListenAndServe(":8000", router))
}