// Watch returns a watcher for observing changes to a service.
func (s *Service) Watch() (watcher.NotifyWatcher, error) {
var results params.NotifyWatchResults
args := params.Entities{
Entities: []params.Entity{{Tag: s.tag}},
}
err := s.st.call("Watch", args, &results)
if err != nil {
return nil, err
}
if len(results.Results) != 1 {
return nil, fmt.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
return nil, result.Error
}
w := watcher.NewNotifyWatcher(s.st.caller, result)
return w, nil
}
// WatchConfigSettings returns a watcher for observing changes to the
// unit's service configuration settings. The unit must have a charm URL
// set before this method is called, and the returned watcher will be
// valid only while the unit's charm URL is not changed.
func (u *Unit) WatchConfigSettings() (watcher.NotifyWatcher, error) {
var results params.NotifyWatchResults
args := params.Entities{
Entities: []params.Entity{{Tag: u.tag}},
}
err := u.st.call("WatchConfigSettings", args, &results)
if err != nil {
return nil, err
}
if len(results.Results) != 1 {
return nil, fmt.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
return nil, result.Error
}
w := watcher.NewNotifyWatcher(u.st.caller, result)
return w, nil
}
// WatchAuthorisedKeys returns a notify watcher that looks for changes in the
// authorised ssh keys for the machine specified by machineTag.
func (st *State) WatchAuthorisedKeys(machineTag string) (watcher.NotifyWatcher, error) {
var results params.NotifyWatchResults
args := params.Entities{
Entities: []params.Entity{{Tag: machineTag}},
}
err := st.call("WatchAuthorisedKeys", args, &results)
if err != nil {
// TODO: Not directly tested
return nil, err
}
if len(results.Results) != 1 {
// TODO: Not directly tested
return nil, fmt.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
// TODO: Not directly tested
return nil, result.Error
}
w := watcher.NewNotifyWatcher(st.caller, result)
return w, nil
}
// WatchForRsyslogChanges returns a new NotifyWatcher.
func (st *State) WatchForRsyslogChanges(agentTag string) (watcher.NotifyWatcher, error) {
var results params.NotifyWatchResults
args := params.Entities{
Entities: []params.Entity{{Tag: agentTag}},
}
err := st.caller.Call(rsyslogAPI, "", "WatchForRsyslogChanges", args, &results)
if err != nil {
// TODO: Not directly tested
return nil, err
}
if len(results.Results) != 1 {
// TODO: Not directly tested
return nil, fmt.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
// TODO: Not directly tested
return nil, result.Error
}
w := watcher.NewNotifyWatcher(st.caller, result)
return w, nil
}