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BlockSyncer.swift
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BlockSyncer.swift
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import HsToolKit
class BlockSyncer {
weak var listener: IBlockSyncListener?
private let storage: IStorage
private let checkpoint: Checkpoint
private let factory: IFactory
private let transactionProcessor: IBlockTransactionProcessor
private let blockchain: IBlockchain
private let publicKeyManager: IPublicKeyManager
private let hashCheckpointThreshold: Int
private var state: BlockSyncerState
private let logger: Logger?
init(storage: IStorage, checkpoint: Checkpoint, factory: IFactory, transactionProcessor: IBlockTransactionProcessor,
blockchain: IBlockchain, publicKeyManager: IPublicKeyManager, hashCheckpointThreshold: Int, logger: Logger?, state: BlockSyncerState
) {
self.storage = storage
self.checkpoint = checkpoint
self.factory = factory
self.transactionProcessor = transactionProcessor
self.blockchain = blockchain
self.publicKeyManager = publicKeyManager
self.hashCheckpointThreshold = hashCheckpointThreshold
self.logger = logger
self.state = state
}
var localDownloadedBestBlockHeight: Int32 {
let height = storage.lastBlock?.height
return Int32(height ?? 0)
}
var localKnownBestBlockHeight: Int32 {
let blockchainHashes = storage.blockchainBlockHashes
let existingHashesCount = storage.blocksCount(headerHashes: blockchainHashes.map { $0.headerHash })
return localDownloadedBestBlockHeight + Int32(blockchainHashes.count - existingHashesCount)
}
// We need to clear block hashes when sync peer is disconnected
private func clearBlockHashes() {
storage.deleteBlockchainBlockHashes()
}
private func clearPartialBlocks() throws {
var excludedHashes = [checkpoint.block.headerHash]
checkpoint.additionalBlocks.forEach { excludedHashes.append($0.headerHash) }
let blockHashes = storage.blockHashHeaderHashes(except: excludedHashes)
let blocksToDelete = storage.blocks(byHexes: blockHashes)
try blockchain.deleteBlocks(blocks: blocksToDelete)
}
private func handlePartialBlocks() throws {
try publicKeyManager.fillGap()
state.iteration(hasPartialBlocks: false)
}
}
extension BlockSyncer: IBlockSyncer {
func prepareForDownload() {
do {
try handlePartialBlocks()
try clearPartialBlocks()
clearBlockHashes()
try blockchain.handleFork()
} catch {
logger?.error(error)
}
}
func downloadStarted() {
}
func downloadIterationCompleted() {
if state.iterationHasPartialBlocks {
try? handlePartialBlocks()
}
}
func downloadCompleted() {
try? blockchain.handleFork()
}
func downloadFailed() {
prepareForDownload()
}
func getBlockHashes() -> [BlockHash] {
storage.blockHashesSortedBySequenceAndHeight(limit: 500)
}
func getBlockLocatorHashes(peerLastBlockHeight: Int32) -> [Data] {
var blockLocatorHashes = [Data]()
if let lastBlockHash = storage.lastBlockchainBlockHash {
blockLocatorHashes.append(lastBlockHash.headerHash)
}
if blockLocatorHashes.isEmpty {
for block in storage.blocks(heightGreaterThan: checkpoint.block.height, sortedBy: Block.Columns.height, limit: 10) {
blockLocatorHashes.append(block.headerHash)
}
}
if let peerLastBlock = storage.block(byHeight: Int(peerLastBlockHeight)) {
if !blockLocatorHashes.contains(peerLastBlock.headerHash) {
blockLocatorHashes.append(peerLastBlock.headerHash)
}
} else {
blockLocatorHashes.append(checkpoint.block.headerHash)
}
return blockLocatorHashes
}
func add(blockHashes: [Data]) {
var lastOrder = storage.lastBlockHash?.sequence ?? 0
let existingHashes = storage.blockHashHeaderHashes
let blockHashes: [BlockHash] = blockHashes
.filter {
!existingHashes.contains($0)
}.map {
lastOrder += 1
return factory.blockHash(withHeaderHash: $0, height: 0, order: lastOrder)
}
storage.add(blockHashes: blockHashes)
}
func handle(merkleBlock: MerkleBlock, maxBlockHeight: Int32) throws {
var block: Block!
if let height = merkleBlock.height {
block = try blockchain.forceAdd(merkleBlock: merkleBlock, height: height)
} else {
block = try blockchain.connect(merkleBlock: merkleBlock)
}
do {
try transactionProcessor.processReceived(transactions: merkleBlock.transactions, inBlock: block, skipCheckBloomFilter: self.state.iterationHasPartialBlocks)
} catch _ as BloomFilterManager.BloomFilterExpired {
state.iteration(hasPartialBlocks: true)
}
if !state.iterationHasPartialBlocks {
storage.deleteBlockHash(byHash: block.headerHash)
}
listener?.currentBestBlockHeightUpdated(height: Int32(block.height), maxBlockHeight: maxBlockHeight)
}
func shouldRequestBlock(withHash hash: Data) -> Bool {
storage.block(byHash: hash) == nil
}
}
extension BlockSyncer {
public static func instance(storage: IStorage, checkpoint: Checkpoint, factory: IFactory,
transactionProcessor: IBlockTransactionProcessor, blockchain: IBlockchain, publicKeyManager: IPublicKeyManager,
hashCheckpointThreshold: Int = 100, logger: Logger? = nil, state: BlockSyncerState = BlockSyncerState()) -> BlockSyncer {
let syncer = BlockSyncer(storage: storage, checkpoint: checkpoint, factory: factory, transactionProcessor: transactionProcessor,
blockchain: blockchain, publicKeyManager: publicKeyManager, hashCheckpointThreshold: hashCheckpointThreshold, logger: logger, state: state)
return syncer
}
public static func resolveCheckpoint(network: INetwork, syncMode: BitcoinCore.SyncMode, storage: IStorage) -> Checkpoint {
let lastBlock = storage.lastBlock
let checkpoint: Checkpoint
if syncMode == .full {
checkpoint = network.bip44Checkpoint
} else {
let lastCheckpoint = network.lastCheckpoint
if let block = lastBlock, block.height < lastCheckpoint.block.height {
// When app is updated there may be case when the last block in DB is earlier than new checkpoint block.
// In this case we set the very first checkpoint block for bip44,
// since it surely will be earlier than the last block in DB
checkpoint = network.bip44Checkpoint
} else {
checkpoint = lastCheckpoint
}
}
if lastBlock == nil {
storage.save(block: checkpoint.block)
for block in checkpoint.additionalBlocks {
storage.save(block: block)
}
}
return checkpoint
}
}