124 lines
3.5 KiB
Swift
124 lines
3.5 KiB
Swift
//
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// CompactBlockStorage.swift
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// ZcashLightClientKit
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//
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// Created by Francisco Gindre on 10/13/19.
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// Copyright © 2019 Electric Coin Company. All rights reserved.
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//
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import Foundation
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import SQLite
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protocol ConnectionProvider {
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func connection() throws -> Connection
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}
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class CompactBlockStorage: CompactBlockDAO {
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var dbProvider: ConnectionProvider
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init(connectionProvider: ConnectionProvider) {
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dbProvider = connectionProvider
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}
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private func compactBlocksTable() -> Table {
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Table("compactblocks")
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}
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private func heightColumn() -> Expression<Int64> {
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Expression<Int64>("height")
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}
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private func dataColumn() -> Expression<Blob> {
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Expression<Blob>("data")
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}
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func createTable() throws {
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do {
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let compactBlocks = compactBlocksTable()
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let height = heightColumn()
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let data = dataColumn()
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let db = try dbProvider.connection()
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try db.run(compactBlocks.create(ifNotExists: true) { table in
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table.column(height, primaryKey: true)
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table.column(data)
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}
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)
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try db.run(compactBlocks.createIndex(height, ifNotExists: true))
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} catch {
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throw StorageError.couldNotCreate
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}
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}
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func insert(_ block: ZcashCompactBlock) throws {
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try dbProvider.connection().run(compactBlocksTable().insert(block))
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}
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func insert(_ blocks: [ZcashCompactBlock]) throws {
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let compactBlocks = compactBlocksTable()
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let db = try dbProvider.connection()
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try db.transaction(.immediate) {
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for block in blocks {
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try db.run(compactBlocks.insert(block))
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}
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}
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}
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func latestBlockHeight() throws -> BlockHeight {
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guard let maxHeight = try dbProvider.connection().scalar(compactBlocksTable().select(heightColumn().max)) else {
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return BlockHeight.empty()
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}
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guard let blockHeight = BlockHeight(exactly: maxHeight) else {
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throw StorageError.operationFailed
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}
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return blockHeight
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}
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func rewind(to height: BlockHeight) throws {
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try dbProvider.connection().run(compactBlocksTable().filter(heightColumn() >= Int64(height)).delete())
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}
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}
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extension CompactBlockStorage: CompactBlockRepository {
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func latestHeight() throws -> BlockHeight {
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try latestBlockHeight()
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}
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func latestHeight(result: @escaping (Swift.Result<BlockHeight, Error>) -> Void) {
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DispatchQueue.global(qos: .userInitiated).async {
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do {
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result(.success(try self.latestBlockHeight()))
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} catch {
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result(.failure(error))
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}
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}
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}
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func write(blocks: [ZcashCompactBlock]) throws {
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try insert(blocks)
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}
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func write(blocks: [ZcashCompactBlock], completion: ((Error?) -> Void)?) {
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DispatchQueue.global(qos: .userInitiated).async {
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do {
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try self.insert(blocks)
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completion?(nil)
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} catch {
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completion?(error)
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}
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}
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}
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func rewind(to height: BlockHeight, completion: ((Error?) -> Void)?) {
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DispatchQueue.global(qos: .userInitiated).async {
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do {
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try self.rewind(to: height)
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completion?(nil)
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} catch {
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completion?(error)
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}
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}
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}
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}
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