// startUnit creates a new data value for tracking details of the unit
// and starts watching the unit for port changes. The provided
// machineTag must be the tag for the machine the unit was last
// observed to be assigned to.
func (fw *Firewaller) startUnit(unit *apifirewaller.Unit, machineTag string) error {
service, err := unit.Service()
if err != nil {
return err
}
serviceName := service.Name()
unitName := unit.Name()
openedPorts, err := unit.OpenedPorts()
if err != nil {
return err
}
unitd := &unitData{
fw: fw,
unit: unit,
ports: openedPorts,
}
fw.unitds[unitName] = unitd
unitd.machined = fw.machineds[machineTag]
unitd.machined.unitds[unitName] = unitd
if fw.serviceds[serviceName] == nil {
err := fw.startService(service)
if err != nil {
delete(fw.unitds, unitName)
return err
}
}
unitd.serviced = fw.serviceds[serviceName]
unitd.serviced.unitds[unitName] = unitd
ports := make([]network.Port, len(unitd.ports))
copy(ports, unitd.ports)
go unitd.watchLoop(ports)
return nil
}
