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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package actions
import (
"github.com/juju/loggo"
"github.com/juju/juju/worker/uniter/operation"
"github.com/juju/juju/worker/uniter/remotestate"
"github.com/juju/juju/worker/uniter/resolver"
)
var logger = loggo.GetLogger("juju.worker.uniter.actions")
type actionsResolver struct{}
// NewResolver returns a new resolver with determines which action related operation
// should be run based on local and remote uniter states.
//
// TODO(axw) 2015-10-27 #1510333
// Use the same method as in the runcommands resolver
// for updating the remote state snapshot when an
// action is completed.
func NewResolver() resolver.Resolver {
return &actionsResolver{}
}
func nextAction(pendingActions []string, completedActions map[string]struct{}) (string, error) {
for _, action := range pendingActions {
if _, ok := completedActions[action]; !ok {
return action, nil
}
}
return "", resolver.ErrNoOperation
}
// NextOp implements the resolver.Resolver interface.
func (r *actionsResolver) NextOp(
localState resolver.LocalState,
remoteState remotestate.Snapshot,
opFactory operation.Factory,
) (operation.Operation, error) {
nextAction, err := nextAction(remoteState.Actions, localState.CompletedActions)
if err != nil {
return nil, err
}
switch localState.Kind {
case operation.RunHook:
// We can still run actions if the unit is in a hook error state.
if localState.Step == operation.Pending {
return opFactory.NewAction(nextAction)
}
case operation.RunAction:
// TODO(fwereade): we *should* handle interrupted actions, and make sure
// they're marked as failed, but that's not for now.
if localState.Hook != nil {
logger.Infof("found incomplete action %q; ignoring", localState.ActionId)
logger.Infof("recommitting prior %q hook", localState.Hook.Kind)
return opFactory.NewSkipHook(*localState.Hook)
} else {
logger.Infof("%q hook is nil", operation.RunAction)
}
case operation.Continue:
return opFactory.NewAction(nextAction)
}
return nil, resolver.ErrNoOperation
}
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