New creates a new main chain synchronization engine.

WithPollInterval sets a custom interval at which we scan for poll items.

WithScanInterval sets a custom interval at which we scan for pending items and batch them for requesting.

Engine is the synchronization engine, responsible for synchronizing chain state.

RequestHandler encapsulates message queues and processing logic for the sync engine.

RequestHandlerEngine is an engine which operates only the request-handling portion of the block sync protocol.

RequestHeap is a special structure that implements engine.MessageStore interface and indexes requests by originator.

SpamDetectionConfig contains configuration parameters for spam detection for different message types.