Revert "WIP: download attachments in NSE"

This reverts commit 6fd5bbeab1.

Podfile

@@ -32,7 +32,6 @@ target 'SessionNotificationServiceExtension' do
   pod 'Curve25519Kit', git: 'https://github.com/signalapp/Curve25519Kit.git', :inhibit_warnings => true
   pod 'SignalCoreKit', git: 'https://github.com/signalapp/SignalCoreKit.git', :inhibit_warnings => true
   pod 'YapDatabase/SQLCipher', :git => 'https://github.com/loki-project/session-ios-yap-database.git', branch: 'signal-release', :inhibit_warnings => true
-  pod 'PromiseKit', :inhibit_warnings => true
 end
 
 target 'SignalUtilitiesKit' do

SessionMessagingKit/Database/Storage+Jobs.swift

@@ -73,20 +73,6 @@ extension Storage {
         return result.first
     }
     
-    public func getAttachmentDownloadJob(for attachmentID: String) -> AttachmentDownloadJob? {
-        var result: [AttachmentDownloadJob] = []
-        Storage.read { transaction in
-            transaction.enumerateRows(inCollection: AttachmentDownloadJob.collection) { _, object, _, _ in
-                guard let job = object as? AttachmentDownloadJob, job.attachmentID == attachmentID else { return }
-                result.append(job)
-            }
-        }
-        #if DEBUG
-        assert(result.isEmpty || result.count == 1)
-        #endif
-        return result.first
-    }
-    
     public func getAttachmentDownloadJobs(for threadID: String) -> [AttachmentDownloadJob] {
         var result: [AttachmentDownloadJob] = []
         Storage.read { transaction in

SessionMessagingKit/Jobs/AttachmentDownloadJob.swift

@@ -2,7 +2,6 @@ import Foundation
 import SessionUtilitiesKit
 import SessionSnodeKit
 import SignalCoreKit
-import PromiseKit
 
 public final class AttachmentDownloadJob : NSObject, Job, NSCoding { // NSObject/NSCoding conformance is needed for YapDatabase compatibility
     public let attachmentID: String
@@ -61,29 +60,17 @@ public final class AttachmentDownloadJob : NSObject, Job, NSCoding { // NSObject
 
     // MARK: Running
     public func execute() {
-        executeAsync().retainUntilComplete()
-    }
-    
-    public func executeAsync() -> Promise<Void> {
-        let (promise, seal) = Promise<Void>.pending()
         if let id = id {
             JobQueue.currentlyExecutingJobs.insert(id)
         }
-        guard !isDeferred else {
-            seal.fulfill(())
-            return promise
-        }
+        guard !isDeferred else { return }
         if TSAttachment.fetch(uniqueId: attachmentID) is TSAttachmentStream {
             // FIXME: It's not clear * how * this happens, but apparently we can get to this point
             // from time to time with an already downloaded attachment.
-            handleSuccess()
-            seal.fulfill(())
-            return promise
+            return handleSuccess()
         }
         guard let pointer = TSAttachment.fetch(uniqueId: attachmentID) as? TSAttachmentPointer else {
-            handleFailure(error: Error.noAttachment)
-            seal.reject(Error.noAttachment)
-            return promise
+            return handleFailure(error: Error.noAttachment)
         }
         let storage = SNMessagingKitConfiguration.shared.storage
         storage.write(with: { transaction in
@@ -112,33 +99,24 @@ public final class AttachmentDownloadJob : NSObject, Job, NSCoding { // NSObject
         }
         if let tsMessage = TSMessage.fetch(uniqueId: tsMessageID), let v2OpenGroup = storage.getV2OpenGroup(for: tsMessage.uniqueThreadId) {
             guard let fileAsString = pointer.downloadURL.split(separator: "/").last, let file = UInt64(fileAsString) else {
-                handleFailure(Error.invalidURL)
-                seal.reject(Error.invalidURL)
-                return promise
+                return handleFailure(Error.invalidURL)
             }
             OpenGroupAPIV2.download(file, from: v2OpenGroup.room, on: v2OpenGroup.server).done(on: DispatchQueue.global(qos: .userInitiated)) { data in
                 self.handleDownloadedAttachment(data: data, temporaryFilePath: temporaryFilePath, pointer: pointer, failureHandler: handleFailure)
-                seal.fulfill(())
             }.catch(on: DispatchQueue.global()) { error in
                 handleFailure(error)
-                seal.reject(error)
             }
         } else {
             guard let fileAsString = pointer.downloadURL.split(separator: "/").last, let file = UInt64(fileAsString) else {
-                handleFailure(Error.invalidURL)
-                seal.reject(Error.invalidURL)
-                return promise
+                return handleFailure(Error.invalidURL)
             }
             let useOldServer = pointer.downloadURL.contains(FileServerAPIV2.oldServer)
             FileServerAPIV2.download(file, useOldServer: useOldServer).done(on: DispatchQueue.global(qos: .userInitiated)) { data in
                 self.handleDownloadedAttachment(data: data, temporaryFilePath: temporaryFilePath, pointer: pointer, failureHandler: handleFailure)
-                seal.fulfill(())
             }.catch(on: DispatchQueue.global()) { error in
                 handleFailure(error)
-                seal.reject(error)
             }
         }
-        return promise
     }
     
     private func handleDownloadedAttachment(data: Data, temporaryFilePath: URL, pointer: TSAttachmentPointer, failureHandler: (Swift.Error) -> Void) {

SessionMessagingKit/Storage.swift

@@ -33,7 +33,6 @@ public protocol SessionMessagingKitStorageProtocol {
     func markJobAsFailed(_ job: Job, using transaction: Any)
     func getAllPendingJobs(of type: Job.Type) -> [Job]
     func getAttachmentUploadJob(for attachmentID: String) -> AttachmentUploadJob?
-    func getAttachmentDownloadJob(for attachmentID: String) -> AttachmentDownloadJob?
     func getMessageSendJob(for messageSendJobID: String) -> MessageSendJob?
     func resumeMessageSendJobIfNeeded(_ messageSendJobID: String)
     func isJobCanceled(_ job: Job) -> Bool

SessionNotificationServiceExtension/NotificationServiceExtension.swift

@@ -1,7 +1,6 @@
 import UserNotifications
 import SessionMessagingKit
 import SignalUtilitiesKit
-import PromiseKit
 
 public final class NotificationServiceExtension : UNNotificationServiceExtension {
     private var didPerformSetup = false
@@ -36,7 +35,6 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
             }
             Storage.write { transaction in // Intentionally capture self
                 do {
-                    var attachmentDownloadJobs: [AttachmentDownloadJob] = []
                     let (message, proto) = try MessageReceiver.parse(envelopeAsData, openGroupMessageServerID: nil, using: transaction)
                     let senderPublicKey = message.sender!
                     if (senderPublicKey == userPublicKey) {
@@ -71,14 +69,6 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
                         }
                         // Store the notification ID for unsend requests to later cancel this notification
                         tsIncomingMessage.setNotificationIdentifier(request.identifier, transaction: transaction)
-                        let storage = SNMessagingKitConfiguration.shared.storage
-                        let attachments = visibleMessage.attachmentIDs.compactMap { TSAttachment.fetch(uniqueId: $0) as? TSAttachmentPointer }
-                        let attachmentsToDownload = attachments.filter { !$0.isDownloaded }
-                        attachmentsToDownload.forEach { attachment in
-                            if let attachmentID = attachment.uniqueId, let job = storage.getAttachmentDownloadJob(for: attachmentID) {
-                                attachmentDownloadJobs.append(job)
-                            }
-                        }
                     case let unsendRequest as UnsendRequest:
                         MessageReceiver.handleUnsendRequest(unsendRequest, using: transaction)
                         return self.completeSilenty()
@@ -106,16 +96,7 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
                         notificationContent.body = "You've got a new message"
                     default: break
                     }
-                    if attachmentDownloadJobs.isEmpty {
-                        self.handleSuccess(for: notificationContent)
-                    } else {
-                        let promises = attachmentDownloadJobs.map { $0.executeAsync() }
-                        when(fulfilled: promises).map { attachments in
-                            self.handleSuccess(for: notificationContent)
-                        }.catch { error in
-                            self.handleSuccess(for: notificationContent)
-                        }.retainUntilComplete()
-                    }
+                    self.handleSuccess(for: notificationContent)
                 } catch {
                     self.handleFailure(for: notificationContent)
                 }