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Throttle downloads

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ronaldheft 2022-08-07 21:17:13 -04:00
parent b1b10e846d
commit 30ae98c3de
1 changed files with 8 additions and 38 deletions
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46
ios/App/App/plugins/AbsDownloader.swift
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@ -14,11 +14,11 @@ public class AbsDownloader: CAPPlugin, URLSessionDownloadDelegate {
typealias DownloadProgressHandler = (_ downloadItem: DownloadItem, _ downloadItemPart: inout DownloadItemPart) throws -> Void
private let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
private lazy var session = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue.main)
private let progressStatusQueue = DispatchQueue(label: "progress-status")
private var progressStatusWorkItem: DispatchWorkItem?
private var downloadItemQueue = [String: DownloadItem]()
private lazy var session: URLSession = {
let queue = OperationQueue()
queue.maxConcurrentOperationCount = 5
return URLSession(configuration: .default, delegate: self, delegateQueue: queue)
}()
public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
handleDownloadTaskUpdate(downloadTask: downloadTask) { downloadItem, downloadItemPart in
@ -66,7 +66,6 @@ public class AbsDownloader: CAPPlugin, URLSessionDownloadDelegate {
// Find the download item
let downloadItem = Database.shared.getDownloadItem(downloadItemPartId: downloadItemPartId)
guard var downloadItem = downloadItem else { throw LibraryItemDownloadError.downloadItemNotFound }
downloadItem = self.downloadItemQueue[downloadItem.id!] ?? downloadItem
// Find the download item part
let partIndex = downloadItem.downloadItemParts.firstIndex(where: { $0.id == downloadItemPartId })
@ -81,13 +80,14 @@ public class AbsDownloader: CAPPlugin, URLSessionDownloadDelegate {
}
// Update the progress
self.downloadItemQueue.updateValue(downloadItem, forKey: downloadItem.id!)
Database.shared.updateDownloadItemPart(downloadItem.downloadItemParts[partIndex])
// Notify the UI
self.notifyDownloadProgress()
try? self.notifyListeners("onItemDownloadUpdate", data: downloadItem.asDictionary())
// Handle a completed download
if ( downloadItem.isDoneDownloading() ) {
// TODO: Prevent this block from firing multiple times
defer { Database.shared.removeDownloadItem(downloadItem) }
handleDownloadTaskCompleteFromDownloadItem(downloadItem)
}
@ -97,38 +97,8 @@ public class AbsDownloader: CAPPlugin, URLSessionDownloadDelegate {
}
}
// We want to handle updating the UI in the background and throttled so we don't overload the UI with progress updates
private func notifyDownloadProgress() {
// Return if the loop is running
guard self.progressStatusWorkItem == nil else { return }
// Create a background thread to send the download status
self.progressStatusWorkItem = DispatchWorkItem { [weak self] in // Weak capture so the bg thread is pulling latest data
// Clean up the work item when done
defer { self?.progressStatusWorkItem = nil }
while !(self?.downloadItemQueue.isEmpty ?? true) {
for item in self!.downloadItemQueue.values {
try? self!.notifyListeners("onItemDownloadUpdate", data: item.asDictionary())
// Clean up a completed download
if item.isDoneDownloading() {
self!.downloadItemQueue.removeValue(forKey: item.id!)
}
}
// Wait 200ms before reporting status again
Thread.sleep(forTimeInterval: TimeInterval(0.2))
}
}
// Start the thread
self.progressStatusQueue.async(execute: self.progressStatusWorkItem!)
}
private func handleDownloadTaskCompleteFromDownloadItem(_ downloadItem: DownloadItem) {
if ( downloadItem.didDownloadSuccessfully() ) {
ApiClient.getLibraryItemWithProgress(libraryItemId: downloadItem.libraryItemId!, episodeId: downloadItem.episodeId) { libraryItem in
var statusNotification = [String: Any]()
statusNotification["libraryItemId"] = libraryItem?.id