mirror of
https://github.com/metabolist/metatext.git
synced 2024-05-06 02:28:58 +00:00
Extract CodableBloomFilter package
This commit is contained in:
Justin Mazzocchi
parent
7327d167c3
commit
a12d2eb17d
5
CodableBloomFilter/.gitignore
vendored
5
CodableBloomFilter/.gitignore
vendored
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@ -1,5 +0,0 @@
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.DS_Store
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/.build
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/Packages
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/*.xcodeproj
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xcuserdata/
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@ -1,21 +0,0 @@
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// swift-tools-version:5.3
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import PackageDescription
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let package = Package(
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name: "CodableBloomFilter",
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products: [
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.library(
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name: "CodableBloomFilter",
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targets: ["CodableBloomFilter"])
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],
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dependencies: [],
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targets: [
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.target(
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name: "CodableBloomFilter",
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dependencies: []),
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.testTarget(
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name: "CodableBloomFilterTests",
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dependencies: ["CodableBloomFilter"])
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]
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)
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@ -1,56 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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struct BitArray {
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private var bytes: [UInt8]
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init(data: Data) {
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bytes = Array(data)
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}
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}
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extension BitArray {
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var bitCount: Int { bytes.count * UInt8.bitWidth }
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var data: Data { Data(bytes) }
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subscript(index: Int) -> Bool {
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get {
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let (byteIndex, mask) = Self.byteIndexAndMask(index: index)
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return bytes[byteIndex] & mask > 0
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}
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set {
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let (byteIndex, mask) = Self.byteIndexAndMask(index: index)
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if newValue {
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bytes[byteIndex] |= mask
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} else {
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bytes[byteIndex] &= ~mask
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}
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}
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}
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}
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extension BitArray: Codable {
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init(from decoder: Decoder) throws {
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bytes = Array(try decoder.singleValueContainer().decode(Data.self))
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}
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func encode(to encoder: Encoder) throws {
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var container = encoder.singleValueContainer()
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try container.encode(Data(bytes))
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}
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}
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private extension BitArray {
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static func byteIndexAndMask(index: Int) -> (Int, UInt8) {
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let (byteIndex, bitIndex) = index.quotientAndRemainder(dividingBy: UInt8.bitWidth)
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let mask = UInt8(2 << (bitIndex - 1))
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return (byteIndex, mask)
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}
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}
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@ -1,44 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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public struct BloomFilter<T: DeterministicallyHashable>: Codable {
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enum CodingKeys: String, CodingKey {
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case hashes
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case bits = "data"
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}
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public let hashes: [Hash]
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private var bits: BitArray
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public init(hashes: Set<Hash>, byteCount: Int) {
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self.init(hashes: hashes, data: Data(repeating: 0, count: byteCount))
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}
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public init(hashes: Set<Hash>, data: Data) {
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// Sort the hashes for consistent decoding output
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self.hashes = Array(hashes.sorted { $0.rawValue < $1.rawValue })
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bits = BitArray(data: data)
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}
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}
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public extension BloomFilter {
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var data: Data { bits.data }
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mutating func insert(_ newMember: T) {
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for index in indices(newMember) {
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bits[index] = true
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}
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}
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func contains(_ member: T) -> Bool {
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indices(member).allSatisfy { bits[$0] }
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}
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}
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private extension BloomFilter {
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func indices(_ member: T) -> [Int] {
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hashes.map { abs($0.apply(member)) % bits.bitCount }
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}
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}
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@ -1,7 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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public protocol DeterministicallyHashable {
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var dataForHashingDeterministically: Data { get }
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}
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@ -1,7 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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extension Data: DeterministicallyHashable {
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public var dataForHashingDeterministically: Data { self }
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}
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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extension String: DeterministicallyHashable {
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public var dataForHashingDeterministically: Data { Data(utf8) }
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}
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@ -1,49 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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public enum Hash: String, Codable {
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case djb232
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case djb2a32
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case sdbm32
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case fnv132
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case fnv1a32
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}
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extension Hash {
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func apply(_ hashable: DeterministicallyHashable) -> Int {
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Int(Array(hashable.dataForHashingDeterministically)
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.map(UInt32.init)
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.reduce(offsetBasis, hash))
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}
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}
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// http://www.cse.yorku.ca/~oz/hash.html
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// http://www.isthe.com/chongo/tech/comp/fnv/
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private extension Hash {
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static let fnvPrime: UInt32 = 16777619
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var offsetBasis: UInt32 {
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switch self {
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case .djb232, .djb2a32: return 5381
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case .sdbm32: return 0
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case .fnv132, .fnv1a32: return 2166136261
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}
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}
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func hash(result: UInt32, next: UInt32) -> UInt32 {
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switch self {
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case .djb232:
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return (result << 5) &+ result &+ next
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case .djb2a32:
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return (result << 5) &+ result ^ next
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case .sdbm32:
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return next &+ (result << 6) &+ (result << 16) &- result
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case .fnv132:
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return (result &* Self.fnvPrime) ^ next
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case .fnv1a32:
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return (result ^ next) &* Self.fnvPrime
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}
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}
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}
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@ -1,132 +0,0 @@
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// Copyright © 2020 Metabolist. All rights reserved.
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@testable import CodableBloomFilter
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import XCTest
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final class CodableBloomFilterTests: XCTestCase {
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func testHashes() {
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XCTAssertEqual(Hash.djb232.apply("hash"), 2090320585)
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XCTAssertEqual(Hash.djb2a32.apply("hash"), 2087809207)
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XCTAssertEqual(Hash.sdbm32.apply("hash"), 385600046)
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XCTAssertEqual(Hash.fnv132.apply("hash"), 3616638997)
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XCTAssertEqual(Hash.fnv1a32.apply("hash"), 3469047761)
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}
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func testContains() throws {
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var sut = BloomFilter<String>(hashes: [.sdbm32, .djb232], byteCount: 8)
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sut.insert("lol")
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sut.insert("ok")
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XCTAssert(sut.contains("lol"))
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XCTAssert(sut.contains("ok"))
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XCTAssertFalse(sut.contains("wtf"))
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XCTAssertFalse(sut.contains("no"))
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}
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func testData() throws {
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var sut = BloomFilter<String>(hashes: [.sdbm32, .djb232], byteCount: 8)
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sut.insert("lol")
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sut.insert("ok")
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XCTAssertEqual(sut.data, Data([0, 16, 0, 0, 0, 2, 0, 144]))
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}
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func testFromData() throws {
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let sut = BloomFilter<String>(hashes: [.sdbm32, .djb232], data: Data([0, 16, 0, 0, 0, 2, 0, 144]))
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XCTAssert(sut.contains("lol"))
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XCTAssert(sut.contains("ok"))
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XCTAssertFalse(sut.contains("wtf"))
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XCTAssertFalse(sut.contains("no"))
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}
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func testCoding() throws {
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var sut = BloomFilter<String>(hashes: [.sdbm32, .djb232], byteCount: 8)
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let expectedData = Data(#"{"data":"ABAAAAACAJA=","hashes":["djb232","sdbm32"]}"#.utf8)
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sut.insert("lol")
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sut.insert("ok")
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let encoder = JSONEncoder()
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encoder.outputFormatting = .sortedKeys
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let data = try encoder.encode(sut)
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XCTAssertEqual(data, expectedData)
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let decoded = try JSONDecoder().decode(BloomFilter<String>.self, from: data)
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XCTAssert(decoded.contains("lol"))
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XCTAssert(decoded.contains("ok"))
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XCTAssertFalse(decoded.contains("wtf"))
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XCTAssertFalse(decoded.contains("no"))
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}
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func testInvalidHash() throws {
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let invalidData = Data(#"{"data":"ABAAAAACAJA=","hashes":["djb232","invalid"]}"#.utf8)
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XCTAssertThrowsError(try JSONDecoder().decode(BloomFilter<String>.self, from: invalidData)) {
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guard case DecodingError.dataCorrupted = $0 else {
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XCTFail("Expected data corrupted error")
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return
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}
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}
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}
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func testDataEncodingStrategy() throws {
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var sut = BloomFilter<String>(hashes: [.sdbm32, .djb232], byteCount: 8)
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let expectedData = Data(#"{"data":"0010000000020090","hashes":["djb232","sdbm32"]}"#.utf8)
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sut.insert("lol")
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sut.insert("ok")
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let encoder = JSONEncoder()
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encoder.outputFormatting = .sortedKeys
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encoder.dataEncodingStrategy = .custom { data, encoder in
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var container = encoder.singleValueContainer()
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try container.encode(data.map { String(format: "%02.2hhx", $0) }.joined())
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}
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let data = try encoder.encode(sut)
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XCTAssertEqual(data, expectedData)
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}
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func testDataDecodingStrategy() throws {
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let data = Data(#"{"data":"0010000000020090","hashes":["djb232","sdbm32"]}"#.utf8)
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let decoder = JSONDecoder()
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decoder.dataDecodingStrategy = .custom { decoder in
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let container = try decoder.singleValueContainer()
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let string = try container.decode(String.self)
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var bytes = [UInt8]()
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var i = string.startIndex
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while i != string.endIndex {
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let j = string.index(i, offsetBy: 2)
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guard let byte = UInt8(string[i..<j], radix: 16) else {
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throw DecodingError.dataCorruptedError(in: container, debugDescription: "Invalid byte")
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}
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bytes.append(byte)
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i = j
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}
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return Data(bytes)
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}
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let sut = try decoder.decode(BloomFilter<String>.self, from: data)
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XCTAssert(sut.contains("lol"))
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XCTAssert(sut.contains("ok"))
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XCTAssertFalse(sut.contains("wtf"))
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XCTAssertFalse(sut.contains("no"))
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}
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}
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@ -396,7 +396,6 @@
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D0D2AC4C25BCD2A9003D5DF2 /* TagTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TagTableViewCell.swift; sourceTree = "<group>"; };
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D0D2AC5225BCD2BA003D5DF2 /* TagContentConfiguration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TagContentConfiguration.swift; sourceTree = "<group>"; };
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D0D2AC6625BD0484003D5DF2 /* LineChartView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LineChartView.swift; sourceTree = "<group>"; };
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D0D7C013250440610039AD6F /* CodableBloomFilter */ = {isa = PBXFileReference; lastKnownFileType = folder; path = CodableBloomFilter; sourceTree = "<group>"; };
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D0D93EB925D9C70400C622ED /* AutocompleteItemView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutocompleteItemView.swift; sourceTree = "<group>"; };
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D0D93EBF25D9C71D00C622ED /* AutocompleteItemContentConfiguration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutocompleteItemContentConfiguration.swift; sourceTree = "<group>"; };
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D0D93ECF25D9C9ED00C622ED /* AutocompleteItemCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutocompleteItemCollectionViewCell.swift; sourceTree = "<group>"; };
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@ -635,7 +634,6 @@
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D0477F2A25C6EB90005C5368 /* Activities */,
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D0C7D45224F76169001EBDBB /* Assets.xcassets */,
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D0FE1C9625368A15003EF1EB /* Caches */,
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D0D7C013250440610039AD6F /* CodableBloomFilter */,
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D0A1F4F5252E7D2A004435BF /* Data Sources */,
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D085C3BB25008DEC008A6C5E /* DB */,
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D0C7D46824F76169001EBDBB /* Extensions */,
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@ -10,6 +10,15 @@
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"version": "1.0.0"
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}
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},
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{
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"package": "CodableBloomFilter",
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"repositoryURL": "https://github.com/metabolist/codable-bloom-filter.git",
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"state": {
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"branch": null,
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"revision": "53f80465056a95253df797f1d8a9199f8b1c0543",
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"version": "1.0.0"
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}
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},
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{
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"package": "CombineExpectations",
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"repositoryURL": "https://github.com/groue/CombineExpectations.git",
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@ -18,7 +18,9 @@ let package = Package(
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],
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dependencies: [
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.package(url: "https://github.com/groue/CombineExpectations.git", .upToNextMajor(from: "0.7.0")),
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.package(path: "CodableBloomFilter"),
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.package(name: "CodableBloomFilter",
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url: "https://github.com/metabolist/codable-bloom-filter.git",
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.upToNextMajor(from: "1.0.0")),
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.package(path: "DB"),
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.package(path: "Keychain"),
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.package(path: "MastodonAPI"),
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