// Manifolds returns a set of co-configured manifolds covering the various
// responsibilities of a standalone unit agent. It also accepts the logSource
// argument because we haven't figured out how to thread all the logging bits
// through a dependency engine yet.
//
// Thou Shalt Not Use String Literals In This Function. Or Else.
func Manifolds(config ManifoldsConfig) dependency.Manifolds {
return dependency.Manifolds{
// The agent manifold references the enclosing agent, and is the
// foundation stone on which most other manifolds ultimately depend.
// (Currently, that is "all manifolds", but consider a shared clock.)
AgentName: agent.Manifold(config.Agent),
// The machine lock manifold is a thin concurrent wrapper around an
// FSLock in an agreed location. We expect it to be replaced with an
// in-memory lock when the unit agent moves into the machine agent.
MachineLockName: machinelock.Manifold(machinelock.ManifoldConfig{
AgentName: AgentName,
}),
// The api caller is a thin concurrent wrapper around a connection
// to some API server. It's used by many other manifolds, which all
// select their own desired facades. It will be interesting to see
// how this works when we consolidate the agents; might be best to
// handle the auth changes server-side..?
APICallerName: apicaller.Manifold(apicaller.ManifoldConfig{
AgentName: AgentName,
APIInfoGateName: APIInfoGateName,
}),
// This manifold is used to coordinate between the api caller and the
// log sender, which share the API credentials that the API caller may
// update. To avoid surprising races, the log sender waits for the api
// caller to unblock this, indicating that any password dance has been
// completed and the log-sender can now connect without confusion.
APIInfoGateName: gate.Manifold(),
// The log sender is a leaf worker that sends log messages to some
// API server, when configured so to do. We should only need one of
// these in a consolidated agent.
LogSenderName: logsender.Manifold(logsender.ManifoldConfig{
AgentName: AgentName,
APIInfoGateName: APIInfoGateName,
LogSource: config.LogSource,
}),
// The rsyslog config updater is a leaf worker that causes rsyslog
// to send messages to the state servers. We should only need one
// of these in a consolidated agent.
RsyslogConfigUpdaterName: rsyslog.Manifold(rsyslog.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
}),
// The logging config updater is a leaf worker that indirectly
// controls the messages sent via the log sender or rsyslog,
// according to changes in environment config. We should only need
// one of these in a consolidated agent.
LoggingConfigUpdaterName: logger.Manifold(logger.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
}),
// The api address updater is a leaf worker that rewrites agent config
// as the state server addresses change. We should only need one of
// these in a consolidated agent.
APIAdddressUpdaterName: apiaddressupdater.Manifold(apiaddressupdater.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
}),
// The proxy config updater is a leaf worker that sets http/https/apt/etc
// proxy settings.
// TODO(fwereade): timing of this is suspicious. There was superstitious
// code trying to run this early; if that ever helped, it was only by
// coincidence. Probably we ought to be making components that might
// need proxy config into explicit dependencies of the proxy updater...
ProxyConfigUpdaterName: proxyupdater.Manifold(proxyupdater.ManifoldConfig{
APICallerName: APICallerName,
}),
// The upgrader is a leaf worker that returns a specific error type
// recognised by the unit agent, causing other workers to be stopped
// and the agent to be restarted running the new tools. We should only
// need one of these in a consolidated agent, but we'll need to be
// careful about behavioural differences, and interactions with the
// upgrade-steps worker.
UpgraderName: upgrader.Manifold(upgrader.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
}),
// The leadership tracker attempts to secure and retain leadership of
// the unit's service, and is consulted on such matters by the
// uniter. As it stannds today, we'll need one per unit in a
// consolidated agent.
LeadershipTrackerName: leadership.Manifold(leadership.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
LeadershipGuarantee: config.LeadershipGuarantee,
}),
// The uniter installs charms; manages the unit's presence in its
// relations; creates suboordinate units; runs all the hooks; sends
// metrics; etc etc etc. We expect to break it up further in the
// coming weeks, and to need one per unit in a consolidated agent
// (and probably one for each component broken out).
UniterName: uniter.Manifold(uniter.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
LeadershipTrackerName: LeadershipTrackerName,
MachineLockName: MachineLockName,
CharmDirName: CharmDirName,
}),
// TODO (mattyw) should be added to machine agent.
MetricSpoolName: spool.Manifold(spool.ManifoldConfig{
AgentName: AgentName,
}),
// The charmdir resource tracks whether the charm directory is available or
// not; after 'start' hook and before 'stop' hook executes, and not during
// upgrades.
CharmDirName: charmdir.Manifold(),
// The metric collect worker executes the collect-metrics hook in a
// restricted context that can safely run concurrently with other hooks.
MetricCollectName: collect.Manifold(collect.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
MetricSpoolName: MetricSpoolName,
CharmDirName: CharmDirName,
}),
// The meter status worker executes the meter-status-changed hook when it detects
// that the meter status has changed.
MeterStatusName: meterstatus.Manifold(meterstatus.ManifoldConfig{
AgentName: AgentName,
APICallerName: APICallerName,
MachineLockName: MachineLockName,
}),
// The metric sender worker periodically sends accumulated metrics to the state server.
MetricSenderName: sender.Manifold(sender.ManifoldConfig{
APICallerName: APICallerName,
MetricSpoolName: MetricSpoolName,
}),
}
}
// Manifolds returns a set of co-configured manifolds covering the various
// responsibilities of a standalone unit agent. It also accepts the logSource
// argument because we haven't figured out how to thread all the logging bits
// through a dependency engine yet.
//
// Thou Shalt Not Use String Literals In This Function. Or Else.
func Manifolds(config ManifoldsConfig) dependency.Manifolds {
// connectFilter exists to let us retry api connections immediately
// on password change, rather than causing the dependency engine to
// wait for a while.
connectFilter := func(err error) error {
cause := errors.Cause(err)
if cause == apicaller.ErrChangedPassword {
return dependency.ErrBounce
} else if cause == apicaller.ErrConnectImpossible {
return worker.ErrTerminateAgent
}
return err
}
return dependency.Manifolds{
// The agent manifold references the enclosing agent, and is the
// foundation stone on which most other manifolds ultimately depend.
// (Currently, that is "all manifolds", but consider a shared clock.)
agentName: agent.Manifold(config.Agent),
// The machine lock manifold is a thin concurrent wrapper around an
// FSLock in an agreed location. We expect it to be replaced with an
// in-memory lock when the unit agent moves into the machine agent.
machineLockName: machinelock.Manifold(machinelock.ManifoldConfig{
AgentName: agentName,
}),
// The api-config-watcher manifold monitors the API server
// addresses in the agent config and bounces when they
// change. It's required as part of model migrations.
apiConfigWatcherName: apiconfigwatcher.Manifold(apiconfigwatcher.ManifoldConfig{
AgentName: agentName,
AgentConfigChanged: config.AgentConfigChanged,
}),
// The api caller is a thin concurrent wrapper around a connection
// to some API server. It's used by many other manifolds, which all
// select their own desired facades. It will be interesting to see
// how this works when we consolidate the agents; might be best to
// handle the auth changes server-side..?
apiCallerName: apicaller.Manifold(apicaller.ManifoldConfig{
AgentName: agentName,
APIConfigWatcherName: apiConfigWatcherName,
APIOpen: apicaller.APIOpen,
NewConnection: apicaller.ScaryConnect,
Filter: connectFilter,
}),
// The log sender is a leaf worker that sends log messages to some
// API server, when configured so to do. We should only need one of
// these in a consolidated agent.
logSenderName: logsender.Manifold(logsender.ManifoldConfig{
APICallerName: apiCallerName,
LogSource: config.LogSource,
}),
// The upgrader is a leaf worker that returns a specific error type
// recognised by the unit agent, causing other workers to be stopped
// and the agent to be restarted running the new tools. We should only
// need one of these in a consolidated agent, but we'll need to be
// careful about behavioural differences, and interactions with the
// upgradesteps worker.
upgraderName: upgrader.Manifold(upgrader.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
}),
migrationFortressName: fortress.Manifold(),
// The migration minion handles the agent side aspects of model migrations.
migrationMinionName: migrationminion.Manifold(migrationminion.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
FortressName: migrationFortressName,
NewFacade: migrationminion.NewFacade,
NewWorker: migrationminion.NewWorker,
}),
// The logging config updater is a leaf worker that indirectly
// controls the messages sent via the log sender according to
// changes in environment config. We should only need one of
// these in a consolidated agent.
loggingConfigUpdaterName: logger.Manifold(logger.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
}),
// The api address updater is a leaf worker that rewrites agent config
// as the controller addresses change. We should only need one of
// these in a consolidated agent.
apiAddressUpdaterName: apiaddressupdater.Manifold(apiaddressupdater.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
}),
// The proxy config updater is a leaf worker that sets http/https/apt/etc
// proxy settings.
// TODO(fwereade): timing of this is suspicious. There was superstitious
// code trying to run this early; if that ever helped, it was only by
// coincidence. Probably we ought to be making components that might
// need proxy config into explicit dependencies of the proxy updater...
proxyConfigUpdaterName: proxyupdater.Manifold(proxyupdater.ManifoldConfig{
APICallerName: apiCallerName,
}),
// The charmdir resource coordinates whether the charm directory is
// available or not; after 'start' hook and before 'stop' hook
// executes, and not during upgrades.
charmDirName: fortress.Manifold(),
// The leadership tracker attempts to secure and retain leadership of
// the unit's service, and is consulted on such matters by the
// uniter. As it stannds today, we'll need one per unit in a
// consolidated agent.
leadershipTrackerName: leadership.Manifold(leadership.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
LeadershipGuarantee: config.LeadershipGuarantee,
}),
// HookRetryStrategy uses a retrystrategy worker to get a
// retry strategy that will be used by the uniter to run its hooks.
hookRetryStrategyName: retrystrategy.Manifold(retrystrategy.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
NewFacade: retrystrategy.NewFacade,
NewWorker: retrystrategy.NewRetryStrategyWorker,
}),
// The uniter installs charms; manages the unit's presence in its
// relations; creates suboordinate units; runs all the hooks; sends
// metrics; etc etc etc. We expect to break it up further in the
// coming weeks, and to need one per unit in a consolidated agent
// (and probably one for each component broken out).
uniterName: uniter.Manifold(uniter.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
LeadershipTrackerName: leadershipTrackerName,
MachineLockName: machineLockName,
CharmDirName: charmDirName,
HookRetryStrategyName: hookRetryStrategyName,
}),
// TODO (mattyw) should be added to machine agent.
metricSpoolName: spool.Manifold(spool.ManifoldConfig{
AgentName: agentName,
}),
// The metric collect worker executes the collect-metrics hook in a
// restricted context that can safely run concurrently with other hooks.
metricCollectName: collect.Manifold(collect.ManifoldConfig{
AgentName: agentName,
MetricSpoolName: metricSpoolName,
CharmDirName: charmDirName,
}),
// The meter status worker executes the meter-status-changed hook when it detects
// that the meter status has changed.
meterStatusName: meterstatus.Manifold(meterstatus.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
MachineLockName: machineLockName,
NewHookRunner: meterstatus.NewHookRunner,
NewMeterStatusAPIClient: msapi.NewClient,
NewConnectedStatusWorker: meterstatus.NewConnectedStatusWorker,
NewIsolatedStatusWorker: meterstatus.NewIsolatedStatusWorker,
}),
// The metric sender worker periodically sends accumulated metrics to the controller.
metricSenderName: sender.Manifold(sender.ManifoldConfig{
AgentName: agentName,
APICallerName: apiCallerName,
MetricSpoolName: metricSpoolName,
}),
}
}