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75 lines
1.8 KiB
75 lines
1.8 KiB
package process
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import (
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"fmt"
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"io"
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"os"
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"os/exec"
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"time"
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)
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type Process struct {
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Label string
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ExecPath string
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Args []string
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Pid int
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StartTime time.Time
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EndTime time.Time
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Cmd *exec.Cmd `json:"-"`
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ExitState *os.ProcessState `json:"-"`
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InputFile io.Reader `json:"-"`
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OutputFile io.WriteCloser `json:"-"`
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WaitCh chan struct{} `json:"-"`
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}
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// execPath: command name
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// args: args to command. (should not include name)
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func StartProcess(label string, execPath string, args []string, inFile io.Reader, outFile io.WriteCloser) (*Process, error) {
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cmd := exec.Command(execPath, args...)
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cmd.Stdout = outFile
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cmd.Stderr = outFile
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cmd.Stdin = inFile
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if err := cmd.Start(); err != nil {
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return nil, err
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}
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proc := &Process{
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Label: label,
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ExecPath: execPath,
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Args: args,
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Pid: cmd.Process.Pid,
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StartTime: time.Now(),
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Cmd: cmd,
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ExitState: nil,
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InputFile: inFile,
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OutputFile: outFile,
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WaitCh: make(chan struct{}),
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}
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go func() {
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err := proc.Cmd.Wait()
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if err != nil {
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// fmt.Printf("Process exit: %v\n", err)
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if exitError, ok := err.(*exec.ExitError); ok {
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proc.ExitState = exitError.ProcessState
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}
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}
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proc.ExitState = proc.Cmd.ProcessState
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proc.EndTime = time.Now() // TODO make this goroutine-safe
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err = proc.OutputFile.Close()
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if err != nil {
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fmt.Printf("Error closing output file for %v: %v\n", proc.Label, err)
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}
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close(proc.WaitCh)
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}()
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return proc, nil
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}
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func (proc *Process) StopProcess(kill bool) error {
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defer proc.OutputFile.Close()
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if kill {
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// fmt.Printf("Killing process %v\n", proc.Cmd.Process)
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return proc.Cmd.Process.Kill()
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} else {
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// fmt.Printf("Stopping process %v\n", proc.Cmd.Process)
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return proc.Cmd.Process.Signal(os.Interrupt)
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}
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}
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