func generateCurrentOpenFlow(dk docker.Client) (OFRuleSlice, error) {
args := "ovs-ofctl dump-flows " + quiltBridge
stdout, _, err := dk.ExecVerbose(
supervisor.Ovsvswitchd, strings.Split(args, " ")...)
if err != nil {
return nil, fmt.Errorf("failed to list OpenFlow flows: %s",
string(stdout))
}
scanner := bufio.NewScanner(bytes.NewReader(stdout))
var flows OFRuleSlice
// The first line isn't a flow, so skip it.
scanner.Scan()
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
flow, err := makeOFRule(line)
if err != nil {
return nil, fmt.Errorf("failed to make OpenFlow rule: %s", err)
}
flows = append(flows, flow)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("scanner error while getting OpenFlow flows: %s",
err)
}
return flows, nil
}
