NewFetcher creates a periodic.Task that fetches the topology from the discovery service and calls the provided handler on the received topology.

StartRunners starts the runners for the specified configuration.

FailActionContinue indicates that the process continues on error.

FailActionFatal indicates that the process exits on error.

DefaultDynamicFetchInterval is the default time between two dynamic topology queries.

DefaultFetchTimeout is the default timeout for a query.

DefaultInitialConnectPeriod is the default total amount of time spent attempting to connect to the discovery service on start.

DefaultStaticFetchInterval is the default time between two static topology queries.

Runner periodically fetches the topology from the discovery service.

TopoHandlers contains custom topology handlers.

TopoHandler handles a topology fetched from the discovery service, and returns whether the provided topology is an update.