downloader

package
v1.6.0 Latest Latest
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Published: Apr 14, 2017 License: GPL-3.0 Imports: 24 Imported by: 0

Documentation

Overview

Package downloader contains the manual full chain synchronisation.

Index

Constants

This section is empty.

Variables

View Source
var (
	MaxHashFetch    = 512 // Amount of hashes to be fetched per retrieval request
	MaxBlockFetch   = 128 // Amount of blocks to be fetched per retrieval request
	MaxHeaderFetch  = 192 // Amount of block headers to be fetched per retrieval request
	MaxSkeletonSize = 128 // Number of header fetches to need for a skeleton assembly
	MaxBodyFetch    = 128 // Amount of block bodies to be fetched per retrieval request
	MaxReceiptFetch = 256 // Amount of transaction receipts to allow fetching per request
	MaxStateFetch   = 384 // Amount of node state values to allow fetching per request

	MaxForkAncestry = 3 * params.EpochDuration // Maximum chain reorganisation

)

Functions

This section is empty.

Types

type DoneEvent added in v0.9.21

type DoneEvent struct{}

type Downloader

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

func New

func New(mode SyncMode, stateDb ethdb.Database, mux *event.TypeMux, hasHeader headerCheckFn, hasBlockAndState blockAndStateCheckFn,
	getHeader headerRetrievalFn, getBlock blockRetrievalFn, headHeader headHeaderRetrievalFn, headBlock headBlockRetrievalFn,
	headFastBlock headFastBlockRetrievalFn, commitHeadBlock headBlockCommitterFn, getTd tdRetrievalFn, insertHeaders headerChainInsertFn,
	insertBlocks blockChainInsertFn, insertReceipts receiptChainInsertFn, rollback chainRollbackFn, dropPeer peerDropFn) *Downloader

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

func (*Downloader) Cancel added in v0.9.21

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) DeliverBodies added in v1.2.3

func (d *Downloader) DeliverBodies(id string, transactions [][]*types.Transaction, uncles [][]*types.Header) (err error)

DeliverBodies injects a new batch of block bodies received from a remote node.

func (*Downloader) DeliverHeaders added in v1.2.3

func (d *Downloader) DeliverHeaders(id string, headers []*types.Header) (err error)

DeliverHeaders injects a new batch of block headers received from a remote node into the download schedule.

func (*Downloader) DeliverNodeData added in v1.3.3

func (d *Downloader) DeliverNodeData(id string, data [][]byte) (err error)

DeliverNodeData injects a new batch of node state data received from a remote node.

func (*Downloader) DeliverReceipts added in v1.3.3

func (d *Downloader) DeliverReceipts(id string, receipts [][]*types.Receipt) (err error)

DeliverReceipts injects a new batch of receipts received from a remote node.

func (*Downloader) Progress added in v1.3.3

func (d *Downloader) Progress() ethereum.SyncProgress

Progress retrieves the synchronisation boundaries, specifically the origin block where synchronisation started at (may have failed/suspended); the block or header sync is currently at; and the latest known block which the sync targets.

In addition, during the state download phase of fast synchronisation the number of processed and the total number of known states are also returned. Otherwise these are zero.

func (*Downloader) RegisterPeer

func (d *Downloader) RegisterPeer(id string, version int, currentHead currentHeadRetrievalFn,
	getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn,
	getReceipts receiptFetcherFn, getNodeData stateFetcherFn) error

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

func (*Downloader) Synchronise

func (d *Downloader) Synchronise(id string, head common.Hash, td *big.Int, mode SyncMode) error

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 added in v0.9.21

func (d *Downloader) Synchronising() bool

Synchronising returns whether the downloader is currently retrieving blocks.

func (*Downloader) Terminate added in v0.9.32

func (d *Downloader) Terminate()

Terminate interrupts the downloader, canceling all pending operations. The downloader cannot be reused after calling Terminate.

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. An effort is also made to return any pending fetches into the queue.

type FailedEvent added in v0.9.21

type FailedEvent struct{ Err error }

type PublicDownloaderAPI added in v1.4.2

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

PublicDownloaderAPI provides an API which gives information about the current synchronisation status. It offers only methods that operates on data that can be available to anyone without security risks.

func NewPublicDownloaderAPI added in v1.4.2

func NewPublicDownloaderAPI(d *Downloader, m *event.TypeMux) *PublicDownloaderAPI

NewPublicDownloaderAPI create a new PublicDownloaderAPI. The API has an internal event loop that listens for events from the downloader through the global event mux. In case it receives one of these events it broadcasts it to all syncing subscriptions that are installed through the installSyncSubscription channel.

func (*PublicDownloaderAPI) SubscribeSyncStatus added in v1.5.1

func (api *PublicDownloaderAPI) SubscribeSyncStatus(status chan interface{}) *SyncStatusSubscription

SubscribeSyncStatus creates a subscription that will broadcast new synchronisation updates. The given channel must receive interface values, the result can either

func (*PublicDownloaderAPI) Syncing added in v1.4.2

func (api *PublicDownloaderAPI) Syncing(ctx context.Context) (*rpc.Subscription, error)

Syncing provides information when this nodes starts synchronising with the Ethereum network and when it's finished.

type StartEvent added in v0.9.21

type StartEvent struct{}

type SyncMode added in v1.3.3

type SyncMode int

SyncMode represents the synchronisation mode of the downloader.

const (
	FullSync  SyncMode = iota // Synchronise the entire blockchain history from full blocks
	FastSync                  // Quickly download the headers, full sync only at the chain head
	LightSync                 // Download only the headers and terminate afterwards
)

func (SyncMode) IsValid added in v1.6.0

func (mode SyncMode) IsValid() bool

func (SyncMode) MarshalText added in v1.6.0

func (mode SyncMode) MarshalText() ([]byte, error)

func (SyncMode) String added in v1.6.0

func (mode SyncMode) String() string

String implements the stringer interface.

func (*SyncMode) UnmarshalText added in v1.6.0

func (mode *SyncMode) UnmarshalText(text []byte) error

type SyncStatusSubscription added in v1.5.1

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

SyncStatusSubscription represents a syncing subscription.

func (*SyncStatusSubscription) Unsubscribe added in v1.5.1

func (s *SyncStatusSubscription) Unsubscribe()

Unsubscribe uninstalls the subscription from the DownloadAPI event loop. The status channel that was passed to subscribeSyncStatus isn't used anymore after this method returns.

type SyncingResult added in v1.4.2

type SyncingResult struct {
	Syncing bool                  `json:"syncing"`
	Status  ethereum.SyncProgress `json:"status"`
}

SyncingResult provides information about the current synchronisation status for this node.

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