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playground.go
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playground.go
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package gopher
import (
"bytes"
//"fmt"
"go/format"
"golang.org/x/net/websocket"
"io"
"strings"
Lib "github.com/go-on/gopherjslib"
"gopkg.in/mgo.v2/bson"
)
type CMD string
const (
RUN CMD = "run"
CLOSE CMD = "close"
SHARE CMD = "share"
UPDATE CMD = "update"
FMT CMD = "fmt"
)
type Command struct {
Command CMD
Id string
Content string // 内容
}
type Res struct {
Command CMD //
Content string // 相应内容
Err string // 错误
}
// Playground 的静态请求
func playGroundHandler(handler *Handler) {
if handler.Method != "POST" {
id := handler.param("id")
var (
code *Code
err error
content string = `package main
import "fmt"
func main() {
fmt.Println("这个游乐场可以用于重现和分享Go代码.")
}
`
)
if id != "" {
code, err = GetCodeById(id, handler.DB)
content = code.Content
if err != nil {
logger.Println(err)
}
}
handler.render("templates/playground.html", map[string]interface{}{
"Code": content,
"CodeId": id,
"Host": Config.Host,
})
return
}
}
// share code
func shareCodeHandler(handler *Handler) {
}
// 封装websocket
func playSocketHandler(handler *Handler) {
websocket.Handler(playWebSocket(handler)).
ServeHTTP(handler.ResponseWriter, handler.Request)
}
// 封装错误输出
func catch(err error) {
}
var buildOptions = &Lib.Options{
GOROOT: "/usr/local/go",
GOPATH: "/Users/jimmykuu/working/go/gopher",
}
func init() {
buildOptions.Minify = false
}
func buildGoCode(input string, buf *bytes.Buffer) error {
err := Lib.Build(strings.NewReader(input), buf, buildOptions)
if err != nil {
return err
}
output := buf.Bytes()
output = output[13 : len(output)-2] // len( "use strict"\n ) == 11 and final ";\n"
buf.Reset()
io.Copy(buf, bytes.NewReader(output))
return nil
}
// socket 处理主体
func playWebSocket(handler *Handler) func(ws *websocket.Conn) {
return func(ws *websocket.Conn) {
cmd := new(Command)
for {
err := websocket.JSON.Receive(ws, cmd)
if err != nil {
logger.Println(err)
break
}
if cmd.Command == CLOSE {
break
}
if cmd.Command == UPDATE {
println("update")
var id = bson.ObjectIdHex(cmd.Id)
code := &Code{
Id_: id,
}
err := code.Update(handler.DB, bson.M{
"content": cmd.Content,
})
if err != nil {
logger.Println(err)
websocket.JSON.Send(ws, Res{
Command: SHARE,
Err: err.Error(),
})
break
}
websocket.JSON.Send(ws, Res{
Command: SHARE,
Content: id.Hex(),
})
}
if cmd.Command == FMT {
out, err := format.Source([]byte(cmd.Content))
if err != nil {
err = websocket.JSON.Send(ws, Res{
Command: FMT,
Err: err.Error(),
})
} else {
err = websocket.JSON.Send(ws, Res{
Command: FMT,
Content: string(out),
})
}
if err != nil {
logger.Println(err)
break
}
}
if cmd.Command == SHARE {
id := bson.NewObjectId()
code := &Code{
Id_: id,
Content: cmd.Content,
}
err := code.Save(handler.DB)
if err != nil {
logger.Println(err)
websocket.JSON.Send(ws, Res{
Command: SHARE,
Err: err.Error(),
})
break
}
websocket.JSON.Send(ws, Res{
Command: SHARE,
Content: id.Hex(),
})
}
if cmd.Command == RUN {
var buf bytes.Buffer
err := buildGoCode(cmd.Content, &buf)
if err != nil {
err = websocket.JSON.Send(ws, Res{
Command: RUN,
Err: err.Error(),
})
} else {
err = websocket.JSON.Send(ws, Res{
Command: RUN,
Content: buf.String(),
})
}
if err != nil {
logger.Println(err)
break
}
}
}
}
}