wide/playground/run.go

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// Copyright (c) 2014-2015, b3log.org
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package playground
import (
"bufio"
"encoding/json"
"math/rand"
"net/http"
"os/exec"
"time"
"github.com/b3log/wide/conf"
"github.com/b3log/wide/output"
"github.com/b3log/wide/session"
"github.com/b3log/wide/util"
)
const (
outputBufMax = 128 // 128 string(rune)
outputTimeout = 100 // 100ms
)
type outputBuf struct {
content string
millisecond int64
}
// RunHandler handles request of executing a binary file.
func RunHandler(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{"succ": true}
defer util.RetJSON(w, r, data)
var args map[string]interface{}
if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
logger.Error(err)
data["succ"] = false
}
sid := args["sid"].(string)
wSession := session.WideSessions.Get(sid)
if nil == wSession {
data["succ"] = false
}
filePath := args["executable"].(string)
cmd := exec.Command(filePath)
if conf.Docker {
output.SetNamespace(cmd)
}
stdout, err := cmd.StdoutPipe()
if nil != err {
logger.Error(err)
data["succ"] = false
}
stderr, err := cmd.StderrPipe()
if nil != err {
logger.Error(err)
data["succ"] = false
}
outReader := bufio.NewReader(stdout)
errReader := bufio.NewReader(stderr)
if err := cmd.Start(); nil != err {
logger.Error(err)
data["succ"] = false
}
wsChannel := session.PlaygroundWS[sid]
channelRet := map[string]interface{}{}
if !data["succ"].(bool) {
if nil != wsChannel {
channelRet["cmd"] = "run-done"
channelRet["output"] = ""
err := wsChannel.WriteJSON(&channelRet)
if nil != err {
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logger.Warn(err)
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return
}
wsChannel.Refresh()
}
return
}
channelRet["pid"] = cmd.Process.Pid
// add the process to user's process set
output.Processes.Add(wSession, cmd.Process)
go func(runningId int) {
defer util.Recover()
defer cmd.Wait()
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logger.Debugf("User [%s, %s] is running [id=%d, file=%s]", wSession.Username, sid, runningId, filePath)
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// push once for front-end to get the 'run' state and pid
if nil != wsChannel {
channelRet["cmd"] = "run"
channelRet["output"] = ""
err := wsChannel.WriteJSON(&channelRet)
if nil != err {
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logger.Warn(err)
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return
}
wsChannel.Refresh()
}
go func() {
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defer util.Recover()
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buf := outputBuf{}
for {
wsChannel := session.PlaygroundWS[sid]
if nil == wsChannel {
break
}
r, _, err := outReader.ReadRune()
if nil != err {
// remove the exited process from user process set
output.Processes.Remove(wSession, cmd.Process)
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logger.Debugf("User [%s, %s] 's running [id=%d, file=%s] has done [stdout %v], ", wSession.Username, sid, runningId, filePath, err)
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channelRet["cmd"] = "run-done"
channelRet["output"] = buf.content
err := wsChannel.WriteJSON(&channelRet)
if nil != err {
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logger.Warn(err)
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break
}
wsChannel.Refresh()
break
}
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oneRuneStr := string(r)
buf.content += oneRuneStr
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now := time.Now().UnixNano() / int64(time.Millisecond)
if 0 == buf.millisecond {
buf.millisecond = now
}
if now-outputTimeout >= buf.millisecond || len(buf.content) > outputBufMax || oneRuneStr == "\n" {
channelRet["cmd"] = "run"
channelRet["output"] = buf.content
buf = outputBuf{} // a new buffer
err = wsChannel.WriteJSON(&channelRet)
if nil != err {
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logger.Warn(err)
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break
}
wsChannel.Refresh()
}
}
}()
buf := outputBuf{}
for {
r, _, err := errReader.ReadRune()
wsChannel := session.PlaygroundWS[sid]
if nil != err || nil == wsChannel {
break
}
oneRuneStr := string(r)
buf.content += oneRuneStr
now := time.Now().UnixNano() / int64(time.Millisecond)
if 0 == buf.millisecond {
buf.millisecond = now
}
if now-outputTimeout >= buf.millisecond || len(buf.content) > outputBufMax || oneRuneStr == "\n" {
channelRet["cmd"] = "run"
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channelRet["output"] = buf.content
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buf = outputBuf{} // a new buffer
err = wsChannel.WriteJSON(&channelRet)
if nil != err {
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logger.Warn(err)
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break
}
wsChannel.Refresh()
}
}
}(rand.Int())
}
// StopHandler handles request of stoping a running process.
func StopHandler(w http.ResponseWriter, r *http.Request) {
data := map[string]interface{}{"succ": true}
defer util.RetJSON(w, r, data)
var args map[string]interface{}
if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
logger.Error(err)
data["succ"] = false
return
}
sid := args["sid"].(string)
pid := int(args["pid"].(float64))
wSession := session.WideSessions.Get(sid)
if nil == wSession {
data["succ"] = false
return
}
output.Processes.Kill(wSession, pid)
}