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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2020-2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Basics
import Dispatch
import struct Foundation.Data
import class Foundation.JSONDecoder
import class Foundation.JSONEncoder
import struct Foundation.URL
struct FilePackageCollectionsSourcesStorage: PackageCollectionsSourcesStorage {
let fileSystem: FileSystem
let path: AbsolutePath
private let encoder: JSONEncoder
private let decoder: JSONDecoder
init(fileSystem: FileSystem, path: AbsolutePath? = nil) {
self.fileSystem = fileSystem
self.path = path ?? (try? fileSystem.swiftPMConfigurationDirectory.appending("collections.json")) ?? .root
self.encoder = JSONEncoder.makeWithDefaults()
self.decoder = JSONDecoder.makeWithDefaults()
}
func list(callback: @escaping (Result<[Model.CollectionSource], Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
let sources = try self.withLock {
try self.loadFromDisk()
}
callback(.success(sources))
} catch {
callback(.failure(error))
}
}
}
func add(source: Model.CollectionSource,
order: Int?,
callback: @escaping (Result<Void, Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
try self.withLock {
var sources = try self.loadFromDisk()
sources = sources.filter { $0 != source }
let order = order.flatMap { $0 >= 0 && $0 < sources.endIndex ? order : sources.endIndex } ?? sources.endIndex
sources.insert(source, at: order)
try self.saveToDisk(sources)
}
callback(.success(()))
} catch {
callback(.failure(error))
}
}
}
func remove(source: Model.CollectionSource,
callback: @escaping (Result<Void, Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
try self.withLock {
var sources = try self.loadFromDisk()
sources = sources.filter { $0 != source }
try self.saveToDisk(sources)
}
callback(.success(()))
} catch {
callback(.failure(error))
}
}
}
func move(source: Model.CollectionSource,
to order: Int,
callback: @escaping (Result<Void, Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
try self.withLock {
var sources = try self.loadFromDisk()
sources = sources.filter { $0 != source }
let order = order >= 0 && order < sources.endIndex ? order : sources.endIndex
sources.insert(source, at: order)
try self.saveToDisk(sources)
}
callback(.success(()))
} catch {
callback(.failure(error))
}
}
}
func exists(source: Model.CollectionSource,
callback: @escaping (Result<Bool, Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
let sources = try self.withLock {
try self.loadFromDisk()
}
callback(.success(sources.contains(source)))
} catch {
callback(.failure(error))
}
}
}
func update(source: PackageCollectionsModel.CollectionSource,
callback: @escaping (Result<Void, Error>) -> Void) {
DispatchQueue.sharedConcurrent.async {
do {
try self.withLock {
var sources = try self.loadFromDisk()
if let index = sources.firstIndex(where: { $0 == source }) {
sources[index] = source
try self.saveToDisk(sources)
}
}
callback(.success(()))
} catch {
callback(.failure(error))
}
}
}
private func loadFromDisk() throws -> [Model.CollectionSource] {
guard self.fileSystem.exists(self.path) else {
return .init()
}
let data: Data = try fileSystem.readFileContents(self.path)
guard data.count > 0 else {
return .init()
}
let container = try decoder.decode(StorageModel.Container.self, from: data)
return try container.sources()
}
private func saveToDisk(_ sources: [Model.CollectionSource]) throws {
if !self.fileSystem.exists(self.path.parentDirectory) {
try self.fileSystem.createDirectory(self.path.parentDirectory, recursive: true)
}
let container = StorageModel.Container(sources)
let buffer = try encoder.encode(container)
try self.fileSystem.writeFileContents(self.path, data: buffer)
}
private func withLock<T>(_ body: () throws -> T) throws -> T {
if !fileSystem.exists(self.path.parentDirectory) {
try self.fileSystem.createDirectory(self.path.parentDirectory, recursive: true)
}
return try self.fileSystem.withLock(on: self.path.parentDirectory, type: .exclusive, body)
}
}
// MARK: - FilePackageCollectionsSourcesStorage Serialization
private enum StorageModel {
struct Container: Codable {
var data: [Source]
init() {
self.data = .init()
}
init(_ from: [Model.CollectionSource]) {
self.data = from.map { $0.source() }
}
func sources() throws -> [Model.CollectionSource] {
return try self.data.map { try Model.CollectionSource($0) }
}
}
struct Source: Codable {
let type: String
let value: String
let isTrusted: Bool?
let skipSignatureCheck: Bool?
}
enum SourceType: String {
case json
}
}
// MARK: - Utility
private extension Model.CollectionSource {
init(_ from: StorageModel.Source) throws {
guard let url = URL(string: from.value) else {
throw SerializationError.invalidURL(from.value)
}
switch from.type {
case StorageModel.SourceType.json.rawValue:
self.init(type: .json, url: url, isTrusted: from.isTrusted, skipSignatureCheck: from.skipSignatureCheck ?? false)
default:
throw SerializationError.unknownType(from.type)
}
}
func source() -> StorageModel.Source {
switch self.type {
case .json:
return .init(type: StorageModel.SourceType.json.rawValue, value: self.url.absoluteString,
isTrusted: self.isTrusted, skipSignatureCheck: self.skipSignatureCheck)
}
}
}
private enum SerializationError: Error {
case unknownType(String)
case invalidURL(String)
}
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