func (c *ofConn) handshake() (ofDriver, error) {
hdr, err := c.ReadHeader()
if err != nil {
return nil, err
}
h, err := of.ToHello(hdr)
if err != nil {
return nil, err
}
glog.Infof("%v received hello from a switch with OFv%v", c.ctx, h.Version())
version := of.OPENFLOW_1_0
if h.Version() >= uint8(of.OPENFLOW_1_2) {
version = of.OPENFLOW_1_2
}
h.SetVersion(uint8(version))
if err = c.WriteHeader(h.Header); err != nil {
return nil, err
}
c.Flush()
glog.V(2).Info("%v sent hello to the switch", c.ctx)
var driver ofDriver
switch version {
case of.OPENFLOW_1_0:
driver = &of10Driver{}
case of.OPENFLOW_1_2:
driver = &of12Driver{}
}
if err = driver.handshake(c); err != nil {
return nil, err
}
if c.node.ID == nom.NodeID(0) {
return nil, errors.New("ofConn: invalid node after handshake")
}
return driver, nil
}
func (p Poller) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
dict := ctx.Dict(driversDict)
var nds []nodeDrivers
dict.ForEach(func(k string, v interface{}) bool {
node := nom.UID(k)
query := nom.FlowStatsQuery{
Node: node,
}
sendToMaster(query, node, ctx)
nd := v.(nodeDrivers)
updated := false
for i := range nd.Drivers {
// TODO(soheil): remove the hardcoded value.
if nd.Drivers[i].OutPings > MaxPings {
ctx.SendToBee(nom.NodeDisconnected{
Node: nom.Node{ID: nom.NodeID(node)},
Driver: nd.Drivers[i].Driver,
}, ctx.ID())
continue
}
ctx.SendToBee(nom.Ping{}, nd.Drivers[i].BeeID)
nd.Drivers[i].OutPings++
updated = true
}
if updated {
nds = append(nds, nd)
}
return true
})
for _, nd := range nds {
if err := dict.Put(string(nd.Node.ID), nd); err != nil {
glog.Warningf("error in encoding drivers: %v", err)
}
}
return nil
}
func datapathIDToNodeID(dpID uint64) nom.NodeID {
return nom.NodeID(strconv.FormatUint(dpID, 16))
}