func makeManifold(workerResult worker.Worker, workerError error) dependency.Manifold {
return machineundertaker.Manifold(machineundertaker.ManifoldConfig{
APICallerName: "the-caller",
EnvironName: "the-environ",
NewWorker: func(machineundertaker.Facade, environs.Environ) (worker.Worker, error) {
return workerResult, workerError
},
})
}
// Manifolds returns a set of interdependent dependency manifolds that will
// run together to administer a model, as configured.
func Manifolds(config ManifoldsConfig) dependency.Manifolds {
modelTag := config.Agent.CurrentConfig().Model()
return dependency.Manifolds{
// The first group are foundational; the agent and clock
// which wrap those supplied in config, and the api-caller
// through which everything else communicates with the
// controller.
agentName: agent.Manifold(config.Agent),
clockName: clockManifold(config.Clock),
apiConfigWatcherName: apiconfigwatcher.Manifold(apiconfigwatcher.ManifoldConfig{
AgentName: agentName,
AgentConfigChanged: config.AgentConfigChanged,
}),
apiCallerName: apicaller.Manifold(apicaller.ManifoldConfig{
AgentName: agentName,
APIOpen: api.Open,
NewConnection: apicaller.OnlyConnect,
Filter: apiConnectFilter,
}),
// The spaces-imported gate will be unlocked when space
// discovery is known to be complete. Various manifolds
// should also come to depend upon it (or rather, on a
// Flag depending on it) in the future.
spacesImportedGateName: gate.ManifoldEx(config.SpacesImportedGate),
// All other manifolds should depend on at least one of these
// three, which handle all the tasks that are safe and sane
// to run in *all* controller machines.
notDeadFlagName: lifeflag.Manifold(lifeflag.ManifoldConfig{
APICallerName: apiCallerName,
Entity: modelTag,
Result: life.IsNotDead,
Filter: LifeFilter,
NewFacade: lifeflag.NewFacade,
NewWorker: lifeflag.NewWorker,
}),
notAliveFlagName: lifeflag.Manifold(lifeflag.ManifoldConfig{
APICallerName: apiCallerName,
Entity: modelTag,
Result: life.IsNotAlive,
Filter: LifeFilter,
NewFacade: lifeflag.NewFacade,
NewWorker: lifeflag.NewWorker,
}),
isResponsibleFlagName: singular.Manifold(singular.ManifoldConfig{
ClockName: clockName,
AgentName: agentName,
APICallerName: apiCallerName,
Duration: config.RunFlagDuration,
NewFacade: singular.NewFacade,
NewWorker: singular.NewWorker,
}),
// The migration workers collaborate to run migrations;
// and to create a mechanism for running other workers
// so they can't accidentally interfere with a migration
// in progress. Such a manifold should (1) depend on the
// migration-inactive flag, to know when to start or die;
// and (2) occupy the migration-fortress, so as to avoid
// possible interference with the minion (which will not
// take action until it's gained sole control of the
// fortress).
//
// Note that the fortress and flag will only exist while
// the model is not dead; this frees their dependencies
// from model-lifetime concerns.
migrationFortressName: ifNotDead(fortress.Manifold()),
migrationInactiveFlagName: ifNotDead(migrationflag.Manifold(migrationflag.ManifoldConfig{
APICallerName: apiCallerName,
Check: migrationflag.IsTerminal,
NewFacade: migrationflag.NewFacade,
NewWorker: migrationflag.NewWorker,
})),
migrationMasterName: ifNotDead(migrationmaster.Manifold(migrationmaster.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
FortressName: migrationFortressName,
Clock: config.Clock,
NewFacade: migrationmaster.NewFacade,
NewWorker: config.NewMigrationMaster,
})),
// Everything else should be wrapped in ifResponsible,
// ifNotAlive, ifNotDead, or ifNotMigrating (which also
// implies NotDead), to ensure that only a single
// controller is attempting to administer this model at
// any one time.
//
// NOTE: not perfectly reliable at this stage? i.e. a
// worker that ignores its stop signal for "too long"
// might continue to take admin actions after the window
// of responsibility closes. This *is* a pre-existing
// problem, but demands some thought/care: e.g. should
// we make sure the apiserver also closes any
// connections that lose responsibility..? can we make
// sure all possible environ operations are either time-
// bounded or interruptible? etc
//
// On the other hand, all workers *should* be written in
// the expectation of dealing with sucky infrastructure
// running things in parallel unexpectedly, just because
// the universe hates us and will engineer matters such
// that it happens sometimes, even when we try to avoid
// it.
// The environ tracker could/should be used by several other
// workers (firewaller, provisioners, address-cleaner?).
environTrackerName: ifResponsible(environ.Manifold(environ.ManifoldConfig{
APICallerName: apiCallerName,
NewEnvironFunc: config.NewEnvironFunc,
})),
// The undertaker is currently the only ifNotAlive worker.
undertakerName: ifNotAlive(undertaker.Manifold(undertaker.ManifoldConfig{
APICallerName: apiCallerName,
EnvironName: environTrackerName,
NewFacade: undertaker.NewFacade,
NewWorker: undertaker.NewWorker,
})),
// All the rest depend on ifNotMigrating.
spaceImporterName: ifNotMigrating(discoverspaces.Manifold(discoverspaces.ManifoldConfig{
EnvironName: environTrackerName,
APICallerName: apiCallerName,
UnlockerName: spacesImportedGateName,
NewFacade: discoverspaces.NewFacade,
NewWorker: discoverspaces.NewWorker,
})),
computeProvisionerName: ifNotMigrating(provisioner.Manifold(provisioner.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
EnvironName: environTrackerName,
NewProvisionerFunc: provisioner.NewEnvironProvisioner,
})),
storageProvisionerName: ifNotMigrating(storageprovisioner.ModelManifold(storageprovisioner.ModelManifoldConfig{
APICallerName: apiCallerName,
ClockName: clockName,
EnvironName: environTrackerName,
Scope: modelTag,
})),
firewallerName: ifNotMigrating(firewaller.Manifold(firewaller.ManifoldConfig{
APICallerName: apiCallerName,
})),
unitAssignerName: ifNotMigrating(unitassigner.Manifold(unitassigner.ManifoldConfig{
APICallerName: apiCallerName,
})),
applicationScalerName: ifNotMigrating(applicationscaler.Manifold(applicationscaler.ManifoldConfig{
APICallerName: apiCallerName,
NewFacade: applicationscaler.NewFacade,
NewWorker: applicationscaler.New,
})),
instancePollerName: ifNotMigrating(instancepoller.Manifold(instancepoller.ManifoldConfig{
APICallerName: apiCallerName,
EnvironName: environTrackerName,
ClockName: clockName,
Delay: config.InstPollerAggregationDelay,
})),
charmRevisionUpdaterName: ifNotMigrating(charmrevisionmanifold.Manifold(charmrevisionmanifold.ManifoldConfig{
APICallerName: apiCallerName,
ClockName: clockName,
Period: config.CharmRevisionUpdateInterval,
NewFacade: charmrevisionmanifold.NewAPIFacade,
NewWorker: charmrevision.NewWorker,
})),
metricWorkerName: ifNotMigrating(metricworker.Manifold(metricworker.ManifoldConfig{
APICallerName: apiCallerName,
})),
stateCleanerName: ifNotMigrating(cleaner.Manifold(cleaner.ManifoldConfig{
APICallerName: apiCallerName,
})),
statusHistoryPrunerName: ifNotMigrating(statushistorypruner.Manifold(statushistorypruner.ManifoldConfig{
APICallerName: apiCallerName,
MaxHistoryTime: config.StatusHistoryPrunerMaxHistoryTime,
MaxHistoryMB: config.StatusHistoryPrunerMaxHistoryMB,
PruneInterval: config.StatusHistoryPrunerInterval,
// TODO(fwereade): 2016-03-17 lp:1558657
NewTimer: worker.NewTimer,
})),
machineUndertakerName: ifNotMigrating(machineundertaker.Manifold(machineundertaker.ManifoldConfig{
APICallerName: apiCallerName,
EnvironName: environTrackerName,
NewWorker: machineundertaker.NewWorker,
})),
}
}