go-shell

easy execute shell, better os/exec

Feature

• simple api
• add timeout
• add stop()
• add yum api
• use channel to send stdout and stderr
• merge stdout and stderr to new output
• use sync.pool to reduce alloc buffer

Usage

😁 Look at the code for yourself

func TestCheckOutput(t *testing.T) {
	cmd := NewCommand("echo -n 123123")
	cmd.Run() // start and wait
	status := cmd.Status

	assert.Equal(t, status.Output, "123123")
	assert.Equal(t, status.Stdout, "123123")
	assert.Equal(t, status.Stderr, "")
}

func TestCheckStderr(t *testing.T) {
	cmd := NewCommand("echo -n \"123123\" >&2")
	cmd.Run() // start and wait
	status := cmd.Status

	assert.Equal(t, status.Stdout, "")
	assert.Equal(t, status.Output, "123123")
	assert.Equal(t, status.Stderr, "123123")
}

func TestDelayStop(t *testing.T) {
	start := time.Now()
	cmd := NewCommand("sleep 5;echo 123;sleep 123")
	cmd.Start() // async start

	go func() {
		time.Sleep(1 * time.Second)
		cmd.Stop()
	}()

	cmd.Wait() // wait
	end := time.Since(start)
	assert.Less(t, end.Seconds(), float64(2))
}

func TestRunTimeout(t *testing.T) {
	cmd := NewCommand("echo 123; sleep 5", WithTimeout(2))
	cmd.Start()
	cmd.Wait()
	status := cmd.Status

	assert.Equal(t, status.Error, ErrProcessTimeout)
	assert.Greater(t, status.CostTime.Seconds(), float64(2))
	assert.Less(t, status.CostTime.Seconds(), float64(3))
}

func TestCheckStderr(t *testing.T) {
	cmd := NewCommand("echo -n \"123123\" >&2") // echo stderr
	cmd.Run() // start and wait
	status := cmd.Status

	assert.Equal(t, status.Stdout, "")
	assert.Equal(t, status.Output, "123123")
	assert.Equal(t, status.Stderr, "123123")
}

func TestCheckStream(t *testing.T) {
	stdoutChan := make(chan string, 100)
	incr := 0
	go func() {
		for line := range stdoutChan {
			incr++
			fmt.Println(incr, line)
		}
	}()

	cmd := exec.Command("bash", "-c", "echo 123;sleep 1;echo 456; echo 789")
	stdout := NewOutputStream(stdoutChan)
	cmd.Stdout = stdout
	cmd.Run()

	assert.Equal(t, incr, 3)
}

func TestCheckBuffer(t *testing.T) {
	cmd := exec.Command("bash", "-c", "echo 123")
	stdout := NewOutputBuffer()
	cmd.Stdout = stdout
	cmd.Run()

	assert.Equal(t, stdout.buf.String(), "123\n")
	assert.Equal(t, stdout.Lines()[0], "123")
}