fetcher

Documentation

Overview

Package fetcher contains the block announcement based synchronisation.

Index

• type Fetcher
  • func New(getBlock blockRetrievalFn, verifyHeader headerVerifierFn, ...) *Fetcher
  • func (f *Fetcher) Enqueue(peer string, block *types.Block) error
  • func (f *Fetcher) FilterBodies(peer string, transactions [][]*types.Transaction, uncles [][]*types.Header, ...) ([][]*types.Transaction, [][]*types.Header)
  • func (f *Fetcher) FilterHeaders(peer string, headers []*types.Header, time time.Time) []*types.Header
  • func (f *Fetcher) Notify(peer string, hash common.Hash, number uint64, time time.Time, ...) error
  • func (f *Fetcher) SetAppendM2HeaderHook(appendM2HeaderHook func(*types.Block) (*types.Block, bool, error))
  • func (f *Fetcher) SetSignHook(signHook func(*types.Block) error)
  • func (f *Fetcher) Start()
  • func (f *Fetcher) Stop()

Types

type Fetcher

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

Fetcher is responsible for accumulating block announcements from various peers and scheduling them for retrieval.

func New

func New(getBlock blockRetrievalFn, verifyHeader headerVerifierFn, broadcastBlock blockBroadcasterFn, chainHeight chainHeightFn, insertBlock blockInsertFn, prepareBlock blockPrepareFn, dropPeer peerDropFn) *Fetcher

New creates a block fetcher to retrieve blocks based on hash announcements.

func (*Fetcher) Enqueue

func (f *Fetcher) Enqueue(peer string, block *types.Block) error

Enqueue tries to fill gaps the the fetcher's future import queue.

func (*Fetcher) FilterBodies

func (f *Fetcher) FilterBodies(peer string, transactions [][]*types.Transaction, uncles [][]*types.Header, time time.Time) ([][]*types.Transaction, [][]*types.Header)

FilterBodies extracts all the block bodies that were explicitly requested by the fetcher, returning those that should be handled differently.

func (*Fetcher) FilterHeaders

func (f *Fetcher) FilterHeaders(peer string, headers []*types.Header, time time.Time) []*types.Header

FilterHeaders extracts all the headers that were explicitly requested by the fetcher, returning those that should be handled differently.

func (*Fetcher) Notify

func (f *Fetcher) Notify(peer string, hash common.Hash, number uint64, time time.Time,
	headerFetcher headerRequesterFn, bodyFetcher bodyRequesterFn) error

Notify announces the fetcher of the potential availability of a new block in the network.

func (*Fetcher) SetAppendM2HeaderHook

func (f *Fetcher) SetAppendM2HeaderHook(appendM2HeaderHook func(*types.Block) (*types.Block, bool, error))

Bind append m2 to block header hook when imported into chain.

func (*Fetcher) SetSignHook

func (f *Fetcher) SetSignHook(signHook func(*types.Block) error)

Bind double validate hook before block imported into chain.

func (*Fetcher) Start

func (f *Fetcher) Start()

Start boots up the announcement based synchroniser, accepting and processing hash notifications and block fetches until termination requested.

func (*Fetcher) Stop

func (f *Fetcher) Stop()

Stop terminates the announcement based synchroniser, canceling all pending operations.