downloader

Documentation

Index

• Variables
• type Block
• type DoneEvent
• type Downloader
  • func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock blockRetrievalFn, ...) *Downloader
  • func (d *Downloader) Cancel()
  • func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error
  • func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error
  • func (d *Downloader) Has(hash common.Hash) bool
  • func (d *Downloader) RegisterPeer(id string, head common.Hash, getHashes hashFetcherFn, getBlocks blockFetcherFn) error
  • func (d *Downloader) Stats() (pending int, cached int, importing int, estimate time.Duration)
  • func (d *Downloader) Synchronise(id string, head common.Hash)
  • func (d *Downloader) Synchronising() bool
  • func (d *Downloader) UnregisterPeer(id string) error
• type FailedEvent
• type StartEvent

Variables

var (
	MinHashFetch  = 512  // Minimum amount of hashes to not consider a peer stalling
	MaxHashFetch  = 2048 // Amount of hashes to be fetched per retrieval request
	MaxBlockFetch = 128  // Amount of blocks to be fetched per retrieval request

)

Types

type Block

type Block struct {
	RawBlock   *types.Block
	OriginPeer string
}

Block is an origin-tagged blockchain block.

type DoneEvent

type DoneEvent struct{}

type Downloader

type Downloader struct {
	// contains filtered or unexported fields
}

func New

func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock blockRetrievalFn, insertChain chainInsertFn, dropPeer peerDropFn) *Downloader

New creates a new downloader to fetch hashes and blocks from remote peers.

func (*Downloader) Cancel

func (d *Downloader) Cancel()

Cancel cancels all of the operations and resets the queue. It returns true if the cancel operation was completed.

func (*Downloader) DeliverBlocks

func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error

DeliverBlocks injects a new batch of blocks received from a remote node. This is usually invoked through the BlocksMsg by the protocol handler.

func (*Downloader) DeliverHashes

func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error

DeliverHashes injects a new batch of hashes received from a remote node into the download schedule. This is usually invoked through the BlockHashesMsg by the protocol handler.

func (*Downloader) Has

func (d *Downloader) Has(hash common.Hash) bool

Has checks if the downloader knows about a particular hash, meaning that its either already downloaded of pending retrieval.

func (*Downloader) RegisterPeer

func (d *Downloader) RegisterPeer(id string, head common.Hash, getHashes hashFetcherFn, getBlocks blockFetcherFn) error

RegisterPeer injects a new download peer into the set of block source to be used for fetching hashes and blocks from.

func (*Downloader) Stats

func (d *Downloader) Stats() (pending int, cached int, importing int, estimate time.Duration)

Stats retrieves the current status of the downloader.

func (*Downloader) Synchronise

func (d *Downloader) Synchronise(id string, head common.Hash)

Synchronise tries to sync up our local block chain with a remote peer, both adding various sanity checks as well as wrapping it with various log entries.

func (*Downloader) Synchronising

func (d *Downloader) Synchronising() bool

Synchronising returns whether the downloader is currently retrieving blocks.

func (*Downloader) UnregisterPeer

func (d *Downloader) UnregisterPeer(id string) error

UnregisterPeer remove a peer from the known list, preventing any action from the specified peer.

type FailedEvent

type FailedEvent struct{ Err error }

type StartEvent

type StartEvent struct{}