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process.go
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process.go
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package os
import (
"fmt"
"io"
"os"
"os/exec"
"time"
)
type Process struct {
Label string
WorkDir string
ExecPath string
Args []string
Pid int
StartTime time.Time
EndTime time.Time
Cmd *exec.Cmd `json:"-"`
ExitState *os.ProcessState `json:"-"`
Stdin io.Reader `json:"-"`
Stdout io.WriteCloser `json:"-"`
Stderr io.WriteCloser `json:"-"`
WaitCh chan struct{} `json:"-"`
}
// execPath: command name
// args: args to command. (should not include name)
func StartProcess(label string, dir string, execPath string, args []string, stdin io.Reader, stdout, stderr io.WriteCloser) (*Process, error) {
cmd := exec.Command(execPath, args...)
cmd.Dir = dir
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Stdin = stdin
if err := cmd.Start(); err != nil {
return nil, err
}
proc := &Process{
Label: label,
WorkDir: dir,
ExecPath: execPath,
Args: args,
Pid: cmd.Process.Pid,
StartTime: time.Now(),
Cmd: cmd,
ExitState: nil,
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
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.ExitState = proc.Cmd.ProcessState
proc.EndTime = time.Now() // TODO make this goroutine-safe
err = proc.Stdout.Close()
if err != nil {
fmt.Printf("Error closing stdout for %v: %v\n", proc.Label, err)
}
if proc.Stderr != proc.Stdout {
err = proc.Stderr.Close()
if err != nil {
fmt.Printf("Error closing stderr for %v: %v\n", proc.Label, err)
}
}
close(proc.WaitCh)
}()
return proc, nil
}
func (proc *Process) StopProcess(kill bool) error {
defer func() {
proc.Stdout.Close()
if proc.Stderr != proc.Stdout {
proc.Stderr.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)
}
}