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package process
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"time"
)
type Process struct {
Label string
ExecPath string
Pid int
StartTime time.Time
EndTime time.Time
OutputPath string
Cmd *exec.Cmd `json:"-"`
ExitState *os.ProcessState `json:"-"`
OutputFile *os.File `json:"-"`
WaitCh chan struct{} `json:"-"`
}
const (
ProcessModeStd = iota
ProcessModeDaemon
)
// execPath: command name
// args: args to command. (should not include name)
func Create(mode int, label string, execPath string, args []string, input string, outPath string) (*Process, error) {
outFile, err := os.OpenFile(outPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0600)
if err != nil {
return nil, err
}
cmd := exec.Command(execPath, args...)
switch mode {
case ProcessModeStd:
cmd.Stdout = io.MultiWriter(os.Stdout, outFile)
cmd.Stderr = io.MultiWriter(os.Stderr, outFile)
cmd.Stdin = nil
case ProcessModeDaemon:
cmd.Stdout = outFile
cmd.Stderr = outFile
cmd.Stdin = nil
}
if input != "" {
cmd.Stdin = bytes.NewReader([]byte(input))
}
if err := cmd.Start(); err != nil {
return nil, err
}
proc := &Process{
Label: label,
ExecPath: execPath,
Pid: cmd.Process.Pid,
StartTime: time.Now(),
OutputPath: outPath,
Cmd: cmd,
ExitState: nil,
OutputFile: outFile,
WaitCh: make(chan struct{}),
}
go func() {
err := proc.Cmd.Wait()
if err != nil {
fmt.Printf("Process exit: %v\n", err)
if exitError, ok := err.(*exec.ExitError); ok {
proc.ExitState = exitError.ProcessState
}
}
proc.EndTime = time.Now() // TODO make this goroutine-safe
close(proc.WaitCh)
}()
return proc, nil
}
func ReadOutput(proc *Process) string {
output, err := ioutil.ReadFile(proc.OutputPath)
if err != nil {
return fmt.Sprintf("ERROR READING OUTPUT: %v", err)
}
return string(output)
}
func Stop(proc *Process, kill bool) error {
defer proc.OutputFile.Close()
if kill {
fmt.Printf("Killing process %v\n", proc.Cmd.Process)
return proc.Cmd.Process.Kill()
} else {
fmt.Printf("Stopping process %v\n", proc.Cmd.Process)
return proc.Cmd.Process.Signal(os.Interrupt)
}
}