107 lines
3.2 KiB
Swift
107 lines
3.2 KiB
Swift
// Copyright 2022 Carton contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import Foundation
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#if canImport(FoundationNetworking)
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import FoundationNetworking
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#endif
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public struct InvalidResponseCode: Error {
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let code: UInt
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var description: String {
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"""
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While attempting to download an archive, the server returned an invalid response code \(code)
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"""
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}
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}
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public final class AsyncFileDownload {
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public struct Progress: Sendable {
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public var totalBytes: Int?
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public var receivedBytes: Int
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}
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class FileDownloadDelegate: NSObject, URLSessionDownloadDelegate {
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let path: String
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let onTotalBytes: (Int) -> Void
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let continuation: AsyncThrowingStream<Progress, Error>.Continuation
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var totalBytesToDownload: Int?
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init(
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path: String,
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onTotalBytes: @escaping (Int) -> Void,
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continuation: AsyncThrowingStream<Progress, Error>.Continuation
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) {
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self.path = path
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self.onTotalBytes = onTotalBytes
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self.continuation = continuation
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}
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func urlSession(
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_ session: URLSession,
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downloadTask: URLSessionDownloadTask,
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didWriteData bytesWritten: Int64,
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totalBytesWritten: Int64,
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totalBytesExpectedToWrite: Int64
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) {
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let totalBytesToDownload =
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totalBytesExpectedToWrite != NSURLSessionTransferSizeUnknown
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? Int(totalBytesExpectedToWrite) : nil
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if self.totalBytesToDownload == nil {
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self.totalBytesToDownload = totalBytesToDownload
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self.onTotalBytes(totalBytesToDownload ?? .max)
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}
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continuation.yield(
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AsyncFileDownload.Progress(
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totalBytes: totalBytesToDownload,
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receivedBytes: Int(totalBytesWritten)
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)
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)
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}
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func urlSession(
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_ session: URLSession, downloadTask: URLSessionDownloadTask,
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didFinishDownloadingTo location: URL
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) {
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do {
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try FileManager.default.moveItem(atPath: location.path, toPath: self.path)
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continuation.finish()
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} catch {
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continuation.finish(throwing: error)
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}
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}
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}
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public var progressStream: AsyncThrowingStream<Progress, Error> {
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_progressStream
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}
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private var _progressStream: AsyncThrowingStream<Progress, Error>!
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private var client: URLSession! = nil
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public init(path: String, _ url: URL, onTotalBytes: @escaping (Int) -> Void) {
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_progressStream = .init { continuation in
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let delegate = FileDownloadDelegate(
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path: path,
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onTotalBytes: onTotalBytes,
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continuation: continuation
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)
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self.client = URLSession(configuration: .default, delegate: delegate, delegateQueue: nil)
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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client.downloadTask(with: request).resume()
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}
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}
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}
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