// startUnit creates a new data value for tracking details of the unit
// The provided machineTag must be the tag for the machine the unit was last
// observed to be assigned to.
func (fw *Firewaller) startUnit(unit *firewaller.Unit, machineTag names.MachineTag) error {
application, err := unit.Application()
if err != nil {
return err
}
applicationTag := application.Tag()
unitTag := unit.Tag()
if err != nil {
return err
}
unitd := &unitData{
fw: fw,
unit: unit,
tag: unitTag,
}
fw.unitds[unitTag] = unitd
unitd.machined = fw.machineds[machineTag]
unitd.machined.unitds[unitTag] = unitd
if fw.applicationids[applicationTag] == nil {
err := fw.startService(application)
if err != nil {
delete(fw.unitds, unitTag)
return err
}
}
unitd.serviced = fw.applicationids[applicationTag]
unitd.serviced.unitds[unitTag] = unitd
m, err := unitd.machined.machine()
if err != nil {
return err
}
// check if the machine has ports open on any subnets
subnetTags, err := m.ActiveSubnets()
if err != nil {
return errors.Annotatef(err, "failed getting %q active subnets", machineTag)
}
for _, subnetTag := range subnetTags {
err := fw.openedPortsChanged(machineTag, subnetTag)
if err != nil {
return err
}
}
return nil
}
