func (s *storageResolver) nextHookOp(
tag names.StorageTag,
snap remotestate.StorageSnapshot,
opFactory operation.Factory,
) (operation.Operation, error) {
logger.Debugf("next hook op for %v: %+v", tag, snap)
if !snap.Attached {
return nil, resolver.ErrNoOperation
}
storageAttachment, ok := s.storage.storageAttachments[tag]
if !ok {
return nil, resolver.ErrNoOperation
}
switch snap.Life {
case params.Alive:
if storageAttachment.attached {
// Storage attachments currently do not change
// (apart from lifecycle) after being provisioned.
// We don't process unprovisioned storage here,
// so there's nothing to do.
return nil, resolver.ErrNoOperation
}
case params.Dying:
if !storageAttachment.attached {
// Nothing to do: attachment is dying, but
// the storage-attached hook has not been
// consumed.
return nil, resolver.ErrNoOperation
}
case params.Dead:
// Storage must have been Dying to become Dead;
// no further action is required.
return nil, resolver.ErrNoOperation
}
hookInfo := hook.Info{
StorageId: tag.Id(),
}
if snap.Life == params.Alive {
hookInfo.Kind = hooks.StorageAttached
} else {
hookInfo.Kind = hooks.StorageDetaching
}
context := &contextStorage{
tag: tag,
kind: storage.StorageKind(snap.Kind),
location: snap.Location,
}
storageAttachment.ContextStorageAttachment = context
s.storage.storageAttachments[tag] = storageAttachment
logger.Debugf("queued hook: %v", hookInfo)
return opFactory.NewRunHook(hookInfo)
}
// Commit updates relation state to include the fact of the hook's execution,
// records the impact of start and collect-metrics hooks, and queues follow-up
// config-changed hooks to directly follow install and upgrade-charm hooks.
// Commit is part of the Operation interface.
func (rh *runHook) Commit(state State) (*State, error) {
if err := rh.callbacks.CommitHook(rh.info); err != nil {
return nil, err
}
change := stateChange{
Kind: Continue,
Step: Pending,
}
var hi *hook.Info = &hook.Info{Kind: hooks.ConfigChanged}
switch rh.info.Kind {
case hooks.ConfigChanged:
if state.Started {
break
}
hi.Kind = hooks.Start
fallthrough
case hooks.UpgradeCharm:
change = stateChange{
Kind: RunHook,
Step: Queued,
Hook: hi,
}
}
newState := change.apply(state)
switch rh.info.Kind {
case hooks.Start:
newState.Started = true
case hooks.Stop:
newState.Stopped = true
case hooks.CollectMetrics:
newState.CollectMetricsTime = time.Now().Unix()
case hooks.UpdateStatus:
newState.UpdateStatusTime = time.Now().Unix()
}
return newState, nil
}
func (s *storageResolver) nextHookOp(
tag names.StorageTag,
snap remotestate.StorageSnapshot,
opFactory operation.Factory,
) (operation.Operation, error) {
logger.Debugf("next hook op for %v: %+v", tag, snap)
if snap.Life == params.Dead {
// Storage must have been Dying to become Dead;
// no further action is required.
return nil, resolver.ErrNoOperation
}
hookInfo := hook.Info{StorageId: tag.Id()}
switch snap.Life {
case params.Alive:
storageAttachment, ok := s.storage.storageAttachments[tag]
if ok && storageAttachment.attached {
// Once the storage is attached, we only care about
// lifecycle state changes.
return nil, resolver.ErrNoOperation
}
// The storage-attached hook has not been committed, so add the
// storage to the pending set.
s.storage.pending.Add(tag)
if !snap.Attached {
// The storage attachment has not been provisioned yet,
// so just ignore it for now. We'll be notified again
// when it has been provisioned.
return nil, resolver.ErrNoOperation
}
// The storage is alive, but we haven't previously run the
// "storage-attached" hook. Do so now.
hookInfo.Kind = hooks.StorageAttached
case params.Dying:
storageAttachment, ok := s.storage.storageAttachments[tag]
if !ok || !storageAttachment.attached {
// Nothing to do: attachment is dying, but
// the storage-attached hook has not been
// issued.
return nil, resolver.ErrNoOperation
}
// The storage is dying, but we haven't previously run the
// "storage-detached" hook. Do so now.
hookInfo.Kind = hooks.StorageDetaching
}
// Update the local state to reflect what we're about to report
// to a hook.
stateFile, err := readStateFile(s.storage.storageStateDir, tag)
if err != nil {
return nil, errors.Trace(err)
}
s.storage.storageAttachments[tag] = storageAttachment{
stateFile, &contextStorage{
tag: tag,
kind: storage.StorageKind(snap.Kind),
location: snap.Location,
},
}
return opFactory.NewRunHook(hookInfo)
}
// deploy deploys the supplied charm URL, and sets follow-up hook operation state
// as indicated by reason.
func (u *Uniter) deploy(curl *corecharm.URL, reason Op) error {
if reason != Install && reason != Upgrade {
panic(fmt.Errorf("%q is not a deploy operation", reason))
}
var hi *hook.Info
if u.s != nil && (u.s.Op == RunHook || u.s.Op == Upgrade) {
// If this upgrade interrupts a RunHook, we need to preserve the hook
// info so that we can return to the appropriate error state. However,
// if we're resuming (or have force-interrupted) an Upgrade, we also
// need to preserve whatever hook info was preserved when we initially
// started upgrading, to ensure we still return to the correct state.
hi = u.s.Hook
}
if u.s == nil || u.s.OpStep != Done {
// Get the new charm bundle before announcing intention to use it.
logger.Infof("fetching charm %q", curl)
sch, err := u.st.Charm(curl)
if err != nil {
return err
}
if err = u.deployer.Stage(sch, u.tomb.Dying()); err != nil {
return err
}
// Set the new charm URL - this returns when the operation is complete,
// at which point we can refresh the local copy of the unit to get a
// version with the correct charm URL, and can go ahead and deploy
// the charm proper.
if err := u.f.SetCharm(curl); err != nil {
return err
}
if err := u.unit.Refresh(); err != nil {
return err
}
logger.Infof("deploying charm %q", curl)
if err = u.writeState(reason, Pending, hi, curl); err != nil {
return err
}
if err = u.deployer.Deploy(); err != nil {
return err
}
if err = u.writeState(reason, Done, hi, curl); err != nil {
return err
}
}
logger.Infof("charm %q is deployed", curl)
status := Queued
if hi != nil {
// If a hook operation was interrupted, restore it.
status = Pending
} else {
// Otherwise, queue the relevant post-deploy hook.
hi = &hook.Info{}
switch reason {
case Install:
hi.Kind = hooks.Install
case Upgrade:
hi.Kind = hooks.UpgradeCharm
}
}
return u.writeState(RunHook, status, hi, nil)
}