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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package process
import (
"bytes"
"errors"
"fmt"
"os/exec"
"time"
"github.com/gogits/gogs/modules/log"
)
var (
ErrExecTimeout = errors.New("Process execution timeout")
)
// Common timeout.
var (
// NOTE: could be custom in config file for default.
DEFAULT = 60 * time.Second
)
// Process represents a working process inherit from Gogs.
type Process struct {
Pid int64 // Process ID, not system one.
Description string
Start time.Time
Cmd *exec.Cmd
}
// List of existing processes.
var (
curPid int64 = 1
Processes []*Process
)
// Add adds a existing process and returns its PID.
func Add(desc string, cmd *exec.Cmd) int64 {
pid := curPid
Processes = append(Processes, &Process{
Pid: pid,
Description: desc,
Start: time.Now(),
Cmd: cmd,
})
curPid++
return pid
}
// Exec starts executing a command in given path, it records its process and timeout.
func ExecDir(timeout time.Duration, dir, desc, cmdName string, args ...string) (string, string, error) {
if timeout == -1 {
timeout = DEFAULT
}
bufOut := new(bytes.Buffer)
bufErr := new(bytes.Buffer)
cmd := exec.Command(cmdName, args...)
cmd.Dir = dir
cmd.Stdout = bufOut
cmd.Stderr = bufErr
if err := cmd.Start(); err != nil {
return "", err.Error(), err
}
pid := Add(desc, cmd)
done := make(chan error)
go func() {
done <- cmd.Wait()
}()
var err error
select {
case <-time.After(timeout):
if errKill := Kill(pid); errKill != nil {
log.Error(4, "Exec(%d:%s): %v", pid, desc, errKill)
}
<-done
return "", ErrExecTimeout.Error(), ErrExecTimeout
case err = <-done:
}
Remove(pid)
return bufOut.String(), bufErr.String(), err
}
// Exec starts executing a command, it records its process and timeout.
func ExecTimeout(timeout time.Duration, desc, cmdName string, args ...string) (string, string, error) {
return ExecDir(timeout, "", desc, cmdName, args...)
}
// Exec starts executing a command, it records its process and has default timeout.
func Exec(desc, cmdName string, args ...string) (string, string, error) {
return ExecDir(-1, "", desc, cmdName, args...)
}
// Remove removes a process from list.
func Remove(pid int64) {
for i, proc := range Processes {
if proc.Pid == pid {
Processes = append(Processes[:i], Processes[i+1:]...)
return
}
}
}
// Kill kills and removes a process from list.
func Kill(pid int64) error {
for i, proc := range Processes {
if proc.Pid == pid {
if proc.Cmd != nil && proc.Cmd.Process != nil &&
proc.Cmd.ProcessState != nil && !proc.Cmd.ProcessState.Exited() {
if err := proc.Cmd.Process.Kill(); err != nil {
return fmt.Errorf("fail to kill process(%d/%s): %v", proc.Pid, proc.Description, err)
}
}
Processes = append(Processes[:i], Processes[i+1:]...)
return nil
}
}
return nil
}
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