// create a new netflow object for the specified bridge
func (b *bridge) NewNetflow(timeout int) (*gonetflow.Netflow, error) {
nf, port, err := gonetflow.NewNetflow()
if err != nil {
return nil, err
}
// connect openvswitch to our new netflow object
var sOut bytes.Buffer
var sErr bytes.Buffer
p := process("ovs")
cmd := &exec.Cmd{
Path: p,
Args: []string{
p,
"--",
"set",
"Bridge",
b.Name,
"netflow=@nf",
"--",
"--id=@nf",
"create",
"NetFlow",
fmt.Sprintf("targets=\"127.0.0.1:%v\"", port),
fmt.Sprintf("active-timeout=%v", timeout),
},
Env: nil,
Dir: "",
Stdout: &sOut,
Stderr: &sErr,
}
log.Debug("creating netflow to bridge with cmd: %v", cmd)
ovsLock.Lock()
err = cmdTimeout(cmd, OVS_TIMEOUT)
ovsLock.Unlock()
if err != nil {
e := fmt.Errorf("NewNetflow: could not enable netflow: %v: %v", err, sErr.String())
return nil, e
}
b.Lock.Lock()
b.nf = nf
b.Lock.Unlock()
return nf, nil
}
// NewNetflow creates a new netflow for the bridge.
func (b *Bridge) NewNetflow(timeout int) (*gonetflow.Netflow, error) {
bridgeLock.Lock()
defer bridgeLock.Unlock()
log.Info("creating netflow on bridge %v", b.Name)
if b.nf != nil {
return nil, fmt.Errorf("bridge already has a netflow object")
}
nf, port, err := gonetflow.NewNetflow()
if err != nil {
return nil, err
}
// connect openvswitch to our new netflow object
args := []string{
"--",
"set",
"Bridge",
b.Name,
"netflow=@nf",
"--",
"--id=@nf",
"create",
"NetFlow",
fmt.Sprintf("targets=\"127.0.0.1:%v\"", port),
fmt.Sprintf("active-timeout=%v", timeout),
}
if _, err := ovsCmdWrapper(args); err != nil {
return nil, fmt.Errorf("enable netflow failed: %v", err)
}
b.nf = nf
return nf, nil
}