fetcher

package
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Published: May 21, 2019 License: GPL-3.0 Imports: 9 Imported by: 0

Documentation

Overview

Package fetcher is for new block body/hash broadcast msg handling.

When a new block Validation msg is generated by a validator, it will be multicasted to all peers of the validator.

There are two kinds of Validation msg, one is the NewBlockMsg, and another is NewBlockHashesMsg.

When received a NewBlockMsg, handleSyncMsg in ProtocolManager will enqueue the msg to pm.fether.

When received a NewBlockHashesMsg, handleSyncMsg in ProtocolManager will notify pm.fether to fetch the new available block.

Package fetcher contains the block announcement based synchronisation.

Index

Constants

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Variables

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Functions

This section is empty.

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, insertChain chainInsertFn, 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, time time.Time) [][]*types.Transaction

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) 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.

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