Ejemplo n.º 1
0
// Manifolds returns a set of co-configured manifolds covering the
// various responsibilities of a machine agent.
//
// Thou Shalt Not Use String Literals In This Function. Or Else.
func Manifolds(config ManifoldsConfig) dependency.Manifolds {

	// connectFilter exists:
	//  1) to let us retry api connections immediately on password change,
	//     rather than causing the dependency engine to wait for a while;
	//  2) to ensure that certain connection failures correctly trigger
	//     complete agent removal. (It's not safe to let any agent other
	//     than the machine mess around with SetCanUninstall).
	connectFilter := func(err error) error {
		cause := errors.Cause(err)
		if cause == apicaller.ErrConnectImpossible {
			err2 := coreagent.SetCanUninstall(config.Agent)
			if err2 != nil {
				return errors.Trace(err2)
			}
			return worker.ErrTerminateAgent
		} else if cause == apicaller.ErrChangedPassword {
			return dependency.ErrBounce
		}
		return err
	}

	return dependency.Manifolds{
		// The agent manifold references the enclosing agent, and is the
		// foundation stone on which most other manifolds ultimately depend.
		agentName: agent.Manifold(config.Agent),

		// The termination worker returns ErrTerminateAgent if a
		// termination signal is received by the process it's running
		// in. It has no inputs and its only output is the error it
		// returns. It depends on the uninstall file having been
		// written *by the manual provider* at install time; it would
		// be Very Wrong Indeed to use SetCanUninstall in conjunction
		// with this code.
		terminationName: terminationworker.Manifold(),

		// The stateconfigwatcher manifold watches the machine agent's
		// configuration and reports if state serving info is
		// present. It will bounce itself if state serving info is
		// added or removed. It is intended as a dependency just for
		// the state manifold.
		stateConfigWatcherName: stateconfigwatcher.Manifold(stateconfigwatcher.ManifoldConfig{
			AgentName:          agentName,
			AgentConfigChanged: config.AgentConfigChanged,
		}),

		// The state manifold creates a *state.State and makes it
		// available to other manifolds. It pings the mongodb session
		// regularly and will die if pings fail.
		stateName: workerstate.Manifold(workerstate.ManifoldConfig{
			AgentName:              agentName,
			StateConfigWatcherName: stateConfigWatcherName,
			OpenState:              config.OpenState,
		}),

		// The stateworkers manifold starts workers which rely on a
		// *state.State but which haven't been converted to run
		// directly under the dependency engine yet. This manifold
		// will be removed once all such workers have been converted;
		// until then, the workers are expected to handle their own
		// checks for upgrades etc, rather than blocking this whole
		// worker on upgrade completion.
		stateWorkersName: StateWorkersManifold(StateWorkersConfig{
			StateName:         stateName,
			StartStateWorkers: config.StartStateWorkers,
		}),

		// 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 upgrade steps gate is used to coordinate workers which
		// shouldn't do anything until the upgrade-steps worker has
		// finished running any required upgrade steps. The flag of
		// similar name is used to implement the isFullyUpgraded func
		// that keeps upgrade concerns out of unrelated manifolds.
		upgradeStepsGateName: gate.ManifoldEx(config.UpgradeStepsLock),
		upgradeStepsFlagName: gate.FlagManifold(gate.FlagManifoldConfig{
			GateName:  upgradeStepsGateName,
			NewWorker: gate.NewFlagWorker,
		}),

		// The upgrade check gate is used to coordinate workers which
		// shouldn't do anything until the upgrader worker has
		// completed its first check for a new tools version to
		// upgrade to. The flag of similar name is used to implement
		// the isFullyUpgraded func that keeps upgrade concerns out of
		// unrelated manifolds.
		upgradeCheckGateName: gate.ManifoldEx(config.UpgradeCheckLock),
		upgradeCheckFlagName: gate.FlagManifold(gate.FlagManifoldConfig{
			GateName:  upgradeCheckGateName,
			NewWorker: gate.NewFlagWorker,
		}),

		// The upgrader is a leaf worker that returns a specific error
		// type recognised by the machine 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,
			UpgradeStepsGateName: upgradeStepsGateName,
			UpgradeCheckGateName: upgradeCheckGateName,
			PreviousAgentVersion: config.PreviousAgentVersion,
		}),

		// The upgradesteps worker runs soon after the machine agent
		// starts and runs any steps required to upgrade to the
		// running jujud version. Once upgrade steps have run, the
		// upgradesteps gate is unlocked and the worker exits.
		upgradeStepsName: upgradesteps.Manifold(upgradesteps.ManifoldConfig{
			AgentName:            agentName,
			APICallerName:        apiCallerName,
			UpgradeStepsGateName: upgradeStepsGateName,
			OpenStateForUpgrade:  config.OpenStateForUpgrade,
			PreUpgradeSteps:      config.PreUpgradeSteps,
		}),

		// The migration minion handles the agent side aspects of model migrations.
		migrationFortressName: ifFullyUpgraded(fortress.Manifold()),
		migrationMinionName: ifFullyUpgraded(migrationminion.Manifold(migrationminion.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
			FortressName:  migrationFortressName,

			NewFacade: migrationminion.NewFacade,
			NewWorker: migrationminion.NewWorker,
		})),

		// The serving-info-setter manifold sets grabs the state
		// serving info from the API connection and writes it to the
		// agent config.
		servingInfoSetterName: ifFullyUpgraded(ServingInfoSetterManifold(ServingInfoSetterConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// The apiworkers manifold starts workers which rely on the
		// machine agent's API connection but have not been converted
		// to work directly under the dependency engine. It waits for
		// upgrades to be finished before starting these workers.
		apiWorkersName: ifFullyUpgraded(APIWorkersManifold(APIWorkersConfig{
			APICallerName:   apiCallerName,
			StartAPIWorkers: config.StartAPIWorkers,
		})),

		// The reboot manifold manages a worker which will reboot the
		// machine when requested. It needs an API connection and
		// waits for upgrades to be complete.
		rebootName: ifFullyUpgraded(reboot.Manifold(reboot.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: ifFullyUpgraded(logger.Manifold(logger.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// The diskmanager worker periodically lists block devices on the
		// machine it runs on. This worker will be run on all Juju-managed
		// machines (one per machine agent).
		diskManagerName: ifFullyUpgraded(diskmanager.Manifold(diskmanager.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// The proxy config updater is a leaf worker that sets http/https/apt/etc
		// proxy settings.
		proxyConfigUpdater: ifFullyUpgraded(proxyupdater.Manifold(proxyupdater.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.
		apiAddressUpdaterName: ifFullyUpgraded(apiaddressupdater.Manifold(apiaddressupdater.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// The machiner Worker will wait for the identified machine to become
		// Dying and make it Dead; or until the machine becomes Dead by other
		// means.
		machinerName: ifFullyUpgraded(machiner.Manifold(machiner.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// 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.
		//
		// NOTE: the LogSource will buffer a large number of messages as an upgrade
		// runs; it currently seems better to fill the buffer and send when stable,
		// optimising for stable controller upgrades rather than up-to-the-moment
		// observable normal-machine upgrades.
		logSenderName: ifFullyUpgraded(logsender.Manifold(logsender.ManifoldConfig{
			APICallerName: apiCallerName,
			LogSource:     config.LogSource,
		})),

		// The deployer worker is responsible for deploying and recalling unit
		// agents, according to changes in a set of state units; and for the
		// final removal of its agents' units from state when they are no
		// longer needed.
		deployerName: ifFullyUpgraded(deployer.Manifold(deployer.ManifoldConfig{
			NewDeployContext: config.NewDeployContext,
			AgentName:        agentName,
			APICallerName:    apiCallerName,
		})),

		authenticationWorkerName: ifFullyUpgraded(authenticationworker.Manifold(authenticationworker.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		// The storageProvisioner worker manages provisioning
		// (deprovisioning), and attachment (detachment) of first-class
		// volumes and filesystems.
		storageProvisionerName: ifFullyUpgraded(storageprovisioner.MachineManifold(storageprovisioner.MachineManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
			Clock:         config.Clock,
		})),

		resumerName: ifFullyUpgraded(resumer.Manifold(resumer.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		identityFileWriterName: ifFullyUpgraded(identityfilewriter.Manifold(identityfilewriter.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		toolsVersionCheckerName: ifFullyUpgraded(toolsversionchecker.Manifold(toolsversionchecker.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		})),

		machineActionName: ifFullyUpgraded(machineactions.Manifold(machineactions.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
			NewFacade:     machineactions.NewFacade,
			NewWorker:     machineactions.NewMachineActionsWorker,
		})),

		hostKeyReporterName: ifFullyUpgraded(hostkeyreporter.Manifold(hostkeyreporter.ManifoldConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
			RootDir:       config.RootDir,
			NewFacade:     hostkeyreporter.NewFacade,
			NewWorker:     hostkeyreporter.NewWorker,
		})),
	}
}
Ejemplo n.º 2
0
// Manifolds returns a set of co-configured manifolds covering the
// various responsibilities of a machine agent.
//
// 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.
		agentName: agent.Manifold(config.Agent),

		// The termination worker returns ErrTerminateAgent if a
		// termination signal is received by the process it's running
		// in. It has no inputs and its only output is the error it
		// returns.
		terminationName: terminationworker.Manifold(),

		// 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,
		}),

		// The upgrade steps gate is used to coordinate workers which
		// shouldn't do anything until the upgrade-steps worker has
		// finished running any required upgrade steps.
		upgradeStepsGateName: gate.ManifoldEx(config.UpgradeStepsLock),

		// The upgrade check gate is used to coordinate workers which
		// shouldn't do anything until the upgrader worker has
		// completed it's first check for a new tools version to
		// upgrade to.
		upgradeCheckGateName: gate.ManifoldEx(config.UpgradeCheckLock),

		// The upgrader is a leaf worker that returns a specific error
		// type recognised by the machine 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,
			UpgradeStepsGateName: upgradeStepsGateName,
			UpgradeCheckGateName: upgradeCheckGateName,
			PreviousAgentVersion: config.PreviousAgentVersion,
		}),

		// The upgradesteps worker runs soon after the machine agent
		// starts and runs any steps required to upgrade to the
		// running jujud version. Once upgrade steps have run, the
		// upgradesteps gate is unlocked and the worker exits.
		upgradeStepsName: upgradesteps.Manifold(upgradesteps.ManifoldConfig{
			AgentName:            agentName,
			APICallerName:        apiCallerName,
			UpgradeStepsGateName: upgradeStepsGateName,
			OpenStateForUpgrade:  config.OpenStateForUpgrade,
			PreUpgradeSteps:      config.PreUpgradeSteps,
		}),

		// The uninstaller manifold checks if the machine is dead. If
		// it is it writes the agent uninstall file and returns
		// ErrTerminateAgent which causes the agent to remove itself.
		uninstallerName: uninstallerManifold(uninstallerManifoldConfig{
			AgentName:          agentName,
			APICallerName:      apiCallerName,
			WriteUninstallFile: config.WriteUninstallFile,
		}),

		// The serving-info-setter manifold sets grabs the state
		// serving info from the API connection and writes it to the
		// agent config.
		servingInfoSetterName: ServingInfoSetterManifold(ServingInfoSetterConfig{
			AgentName:     agentName,
			APICallerName: apiCallerName,
		}),

		// The upgradewaiter manifold aggregates the
		// upgrade-steps-gate and upgrade-check-gate manifolds into
		// one boolean output. It makes it easy to create manifolds
		// which must only run after these upgrade events have
		// occured.
		upgradeWaiterName: upgradewaiter.Manifold(upgradewaiter.ManifoldConfig{
			UpgradeStepsWaiterName: upgradeStepsGateName,
			UpgradeCheckWaiterName: upgradeCheckGateName,
		}),

		// The apiworkers manifold starts workers which rely on the
		// machine agent's API connection but have not been converted
		// to work directly under the dependency engine. It waits for
		// upgrades to be finished before starting these workers.
		apiWorkersName: APIWorkersManifold(APIWorkersConfig{
			APICallerName:     apiCallerName,
			UpgradeWaiterName: upgradeWaiterName,
			StartAPIWorkers:   config.StartAPIWorkers,
		}),

		// The reboot manifold manages a worker which will reboot the
		// machine when requested. It needs an API connection and
		// waits for upgrades to be complete.
		rebootName: reboot.Manifold(reboot.ManifoldConfig{
			AgentName:         agentName,
			APICallerName:     apiCallerName,
			UpgradeWaiterName: upgradeWaiterName,
		}),

		// 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,
			UpgradeWaiterName: upgradeWaiterName,
		}),
	}
}