from 《Go语言.云动力》
1 package main
2
3 import (
4 "io"
5 "log"
6 "net/http"
7 "os"
8 "os/exec"
9 "strconv"
10 )
11
12 var uniq = make(chan int)
13
14 func init() {
15 go func() {
16 for i := 0; ; i++ {
17 uniq <- i
18 }
19 }()
20 }
21
22 func main() {
23 if err := os.Chdir(os.TempDir()); err != nil {
24 log.Fatal(err)
25 }
26
27 http.HandleFunc("/", FrontPage)
28 http.HandleFunc("/compile", Compile)
29 log.Fatal(http.ListenAndServe("127.0.0.1:1234", nil))
30 }
31
32 func FrontPage(w http.ResponseWriter, _ *http.Request) {
33 w.Write([]byte(frontPage))
34 }
35
36 func err(w http.ResponseWriter, e error) bool {
37 if e != nil {
38 w.Write([]byte(e.Error()))
39 return true
40 }
41 return false
42 }
43
44 func Compile(w http.ResponseWriter, req *http.Request) {
45 x := "play_" + strconv.Itoa(<-uniq) + ".go"
46
47 f, e := os.Create(x)
48 if err(w, e) {
49 return
50 }
51
52 defer os.Remove(x)
53 defer f.Close()
54
55 _, e = io.Copy(f, req.Body)
56 if err(w, e) {
57 return
58 }
59 f.Close()
60
61 cmd := exec.Command("go", "run", x)
62 o, e := cmd.CombinedOutput()
63 if err(w, e) {
64 return
65 }
66
67 w.Write(o)
68 }
69
70 const frontPage = `<!doctype html>
71 <html><head>
72 <script>
73 var req;
74 function compile(){
75 var prog = document.getElementById("edit").value;
76 var req = new XMLHttpRequest ();
77 req.onreadystatechange = function() {
78 if (!req || req.readyState != 4)
79 return;
80 document.getElementById("output").innerHTML = req.responseText;
81 }
82 req.open("POST", "/compile", true);
83 req.setRequestHeader("Content-Type", "text/plain;charset=utf-8");
84 req.send(prog);
85 }
86
87 </script>
88 </head>
89 <body>
90 <textarea rows="25" cols="80" id="edit" spellcheck="false">
91
92 package main
93 import "fmt"
94 func main(){
95 fmt.Println("hello, world")
96 }
97 </textarea>
98 <button onclick="compile();">run</button>
99 <div id="output"></div>
100 </body>
101 </html>
102 `
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时间： 2024-12-28 14:28:32