newPeerSet creates a new peer set top track the active download sources.

Number of blocks to retrieve fully even in fast sync.

fetchRequest is a currently running data retrieval operation.

fetchResult is a struct collecting partial results from data fetchers until all outstanding pieces complete and the result as a whole can be processed.

peerSet represents the collection of active peer participating in the chain download procedure.

dataPack is a data message returned by a peer for some query.

LightPeer encapsulates the methods required to synchronise with a remote light peer.

Peer encapsulates the methods required to synchronise with a remote full peer.

peerDropFn is a callback type for dropping a peer detected as malicious.