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p2p/simulations: Fix stopping exec nodes

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Signed-off-by: Lewis Marshall <lewis@lmars.net>
This commit is contained in:
Lewis Marshall 2017-06-18 12:13:49 +02:00
parent 71fb11d6a0
commit 5cfb34a151
1 changed files with 4 additions and 11 deletions
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15
p2p/simulations/adapters/exec.go
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@ -183,25 +183,18 @@ func (n *ExecNode) Start(snapshots map[string][]byte) (err error) {
// read the WebSocket address from the stderr logs
var wsAddr string
errC := make(chan error)
wsAddrC := make(chan string)
go func() {
s := bufio.NewScanner(stderrR)
for s.Scan() {
if strings.Contains(s.Text(), "WebSocket endpoint opened:") {
wsAddr = wsAddrPattern.FindString(s.Text())
break
wsAddrC <- wsAddrPattern.FindString(s.Text())
}
}
select {
case errC <- s.Err():
default:
}
}()
select {
case err := <-errC:
if err != nil {
return fmt.Errorf("error reading WebSocket address from stderr: %s", err)
} else if wsAddr == "" {
case wsAddr = <-wsAddrC:
if wsAddr == "" {
return errors.New("failed to read WebSocket address from stderr")
}
case <-time.After(10 * time.Second):