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Fix race condition. cmdWait will do the closing 

Signed-off-by: David Gageot <david@gageot.net>
This commit is contained in:
David Gageot 2015-12-28 13:11:28 +01:00
parent b185bb3dbd
commit c180a7962b
1 changed files with 14 additions and 34 deletions
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48
libmachine/drivers/plugin/localbinary/plugin.go
View File

@ -32,12 +32,11 @@ const (
type PluginStreamer interface {
// Return a channel for receiving the output of the stream line by
// line, and a channel for stopping the stream when we are finished
// reading from it.
// line.
//
// It happens to be the case that we do this all inside of the main
// plugin struct today, but that may not be the case forever.
AttachStream(*bufio.Scanner) (<-chan string, chan<- bool)
AttachStream(*bufio.Scanner) <-chan string
}
type PluginServer interface {
@ -155,40 +154,23 @@ func (lbe *Executor) Close() error {
return fmt.Errorf("Error waiting for binary close: %s", err)
}
if err := lbe.pluginStdout.Close(); err != nil {
return fmt.Errorf("Error closing plugin stdout: %s", err)
}
if err := lbe.pluginStderr.Close(); err != nil {
return fmt.Errorf("Error closing plugin stderr: %s", err)
}
return nil
}
func stream(scanner *bufio.Scanner, streamOutCh chan<- string, stopCh <-chan bool) {
for {
select {
case <-stopCh:
close(streamOutCh)
return
default:
if scanner.Scan() {
line := scanner.Text()
if err := scanner.Err(); err != nil {
log.Warnf("Scanning stream: %s", err)
}
streamOutCh <- strings.Trim(line, "\n")
}
func stream(scanner *bufio.Scanner, streamOutCh chan<- string) {
for scanner.Scan() {
line := scanner.Text()
if err := scanner.Err(); err != nil {
log.Warnf("Scanning stream: %s", err)
}
streamOutCh <- strings.Trim(line, "\n")
}
}
func (lbp *Plugin) AttachStream(scanner *bufio.Scanner) (<-chan string, chan<- bool) {
func (lbp *Plugin) AttachStream(scanner *bufio.Scanner) <-chan string {
streamOutCh := make(chan string)
stopCh := make(chan bool)
go stream(scanner, streamOutCh, stopCh)
return streamOutCh, stopCh
go stream(scanner, streamOutCh)
return streamOutCh
}
func (lbp *Plugin) execServer() error {
@ -207,8 +189,8 @@ func (lbp *Plugin) execServer() error {
lbp.addrCh <- strings.TrimSpace(addr)
stdOutCh, stopStdoutCh := lbp.AttachStream(outScanner)
stdErrCh, stopStderrCh := lbp.AttachStream(errScanner)
stdOutCh := lbp.AttachStream(outScanner)
stdErrCh := lbp.AttachStream(errScanner)
for {
select {
@ -216,9 +198,7 @@ func (lbp *Plugin) execServer() error {
log.Infof(pluginOut, lbp.MachineName, out)
case err := <-stdErrCh:
log.Debugf(pluginErr, lbp.MachineName, err)
case _ = <-lbp.stopCh:
stopStdoutCh <- true
stopStderrCh <- true
case <-lbp.stopCh:
if err := lbp.Executor.Close(); err != nil {
return fmt.Errorf("Error closing local plugin binary: %s", err)
}