115 lines
4.4 KiB
Swift
115 lines
4.4 KiB
Swift
//
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// Copyright (c) 2021 Open Whisper Systems. All rights reserved.
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//
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import UserNotifications
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import SignalMessaging
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import SignalServiceKit
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// The lifecycle of the NSE looks something like the following:
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// 1) App receives notification
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// 2) System creates an instance of the extension class
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// and calls `didReceive` in the background
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// 3) Extension processes messages / displays whatever
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// notifications it needs to
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// 4) Extension notifies its work is complete by calling
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// the contentHandler
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// 5) If the extension takes too long to perform its work
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// (more than 30s), it will be notified and immediately
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// terminated
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//
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// Note that the NSE does *not* always spawn a new process to
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// handle a new notification and will also try and process notifications
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// in parallel. `didReceive` could be called twice for the same process,
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// but it will always be called on different threads. It may or may not be
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// called on the same instance of `NotificationService` as a previous
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// notification.
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//
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// We keep a global `environment` singleton to ensure that our app context,
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// database, logging, etc. are only ever setup once per *process*
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let environment = NSEEnvironment()
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class NotificationService: UNNotificationServiceExtension {
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var contentHandler: ((UNNotificationContent) -> Void)?
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var areVersionMigrationsComplete = false
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func completeSilenty(timeHasExpired: Bool = false) {
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guard let contentHandler = contentHandler else { return }
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let content = UNMutableNotificationContent()
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// We cannot perform a database read when the NSE's time
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// has expired, we must exit immediately.
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if !timeHasExpired {
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let badgeCount = databaseStorage.read { InteractionFinder.unreadCountInAllThreads(transaction: $0.unwrapGrdbRead) }
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content.badge = NSNumber(value: badgeCount)
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}
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contentHandler(content)
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self.contentHandler = nil
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}
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override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
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self.contentHandler = contentHandler
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if let errorContent = environment.setupIfNecessary() {
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Logger.warn("Posting error notification and skipping processing.")
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contentHandler(errorContent)
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return
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}
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owsAssertDebug(FeatureFlags.notificationServiceExtension)
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Logger.info("Received notification in class: \(self), thread: \(Thread.current), pid: \(ProcessInfo.processInfo.processIdentifier)")
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AppReadiness.runNowOrWhenAppDidBecomeReadySync {
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environment.askMainAppToHandleReceipt { [weak self] mainAppHandledReceipt in
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guard !mainAppHandledReceipt else {
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Logger.info("Received notification handled by main application.")
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self?.completeSilenty()
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return
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}
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Logger.info("Processing received notification.")
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self?.fetchAndProcessMessages()
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}
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}
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}
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// Called just before the extension will be terminated by the system.
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override func serviceExtensionTimeWillExpire() {
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owsFailDebug("NSE expired before messages could be processed")
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// We complete silently here so that nothing is presented to the user.
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// By default the OS will present whatever the raw content of the original
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// notification is to the user otherwise.
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completeSilenty(timeHasExpired: true)
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}
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func fetchAndProcessMessages() {
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AssertIsOnMainThread()
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guard !AppExpiry.shared.isExpired else {
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owsFailDebug("Not processing notifications for expired application.")
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return completeSilenty()
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}
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environment.isProcessingMessages.set(true)
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Logger.info("Beginning message fetch.")
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messageFetcherJob.run().promise.then { [weak self] () -> Promise<Void> in
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Logger.info("Waiting for processing to complete.")
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guard let self = self else { return Promise.value(()) }
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return self.messageProcessor.processingCompletePromise()
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}.ensure { [weak self] in
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Logger.info("Message fetch completed.")
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environment.isProcessingMessages.set(false)
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self?.completeSilenty()
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}.catch { error in
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Logger.warn("Error: \(error)")
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}
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}
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}
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