mirror of https://github.com/linkerd/linkerd2.git
59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
package testutil
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import (
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"bufio"
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"fmt"
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"io"
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"os/exec"
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"strings"
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"time"
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)
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// Stream provides the ability of read the output of an executing process while
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// it is still running
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type Stream struct {
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cmd *exec.Cmd
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out io.ReadCloser
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}
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// Stop closes the stream and kills the process
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func (s *Stream) Stop() {
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s.out.Close()
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s.cmd.Process.Kill()
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}
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// ReadUntil reads from the process output until specified number of lines has
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// been reached, or until a timeout
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func (s *Stream) ReadUntil(lineCount int, timeout time.Duration) ([]string, error) {
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output := make([]string, 0)
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lines := make(chan string)
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timeoutAfter := time.After(timeout)
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scanner := bufio.NewScanner(s.out)
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stopSignal := false
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go func() {
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for scanner.Scan() {
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lines <- scanner.Text()
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if stopSignal {
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close(lines)
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return
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}
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}
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}()
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for {
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select {
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case <-timeoutAfter:
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stopSignal = true
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return output, fmt.Errorf("cmd [%s] Timed out trying to read %d lines", strings.Join(s.cmd.Args, " "), lineCount)
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case line := <-lines:
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output = append(output, line)
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if len(output) >= lineCount {
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stopSignal = true
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return output, nil
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}
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}
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}
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}
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