func newMachineToolWaiter(m *state.Machine) *toolsWaiter {
w := m.Watch()
waiter := &toolsWaiter{
changes: make(chan struct{}, 1),
watcher: w,
tooler: m,
}
go func() {
for _ = range w.Changes() {
waiter.changes <- struct{}{}
}
close(waiter.changes)
}()
return waiter
}
func (s *CommonProvisionerSuite) waitMachine(c *gc.C, m *state.Machine, check func() bool) {
// TODO(jam): We need to grow a new method on NotifyWatcherC
// that calls StartSync while waiting for changes, then
// waitMachine and waitHardwareCharacteristics can use that
// instead
w := m.Watch()
defer stop(c, w)
timeout := time.After(coretesting.LongWait)
resync := time.After(0)
for {
select {
case <-w.Changes():
if check() {
return
}
case <-resync:
resync = time.After(coretesting.ShortWait)
s.BackingState.StartSync()
case <-timeout:
c.Fatalf("machine %v wait timed out", m)
}
}
}