私は自分の連絡先から新しいメッセージを受け取るべきチャットアプリを開発中です。この通知メッセージには、未読メッセージの数も含める必要があります。送信者と受信者の両方がこの情報を更新できるので、runTransaction
が好ましい。残念ながらそれはうまくいきません。それは "つまらない"と感じ、しばらくしてから作業を開始します。 privateChats
ノード(下記参照)は常に最新のメッセージで更新されますが、openChatMessages
ノードでは更新されません。Firebase/iOS:runTransactionsが動作しない場合があります
短時間に多数のメッセージが送信された場合、つまり同じメッセージに対してrunTransactions
があまりにも頻繁に実行されると、これが起こる可能性がありますか?ref
マイデータ構造:
privateChats
$userId
$chatId
$messageId
text
timestamp
senderId
senderEmail
senderName
// this node contains information about open chats
// like last message and counter for unread messages
openChatMessages
$userId
$chatId
text
timestamp
senderId
senderEmail
senderName
counter
マイコード:
class ChatViewController: JSQMessagesViewController {
var user: FIRUser!
var ref: FIRDatabaseReference!
var chatRef: FIRDatabaseReference!
var senderOpenChatRef: FIRDatabaseReference!
var receiverOpenChatRef: FIRDatabaseReference!
// the following variables will be set before ChatViewController appears
var chatId: String?
var receivId: String?
var receiverEmail: String?
var receiverName: String?
override func viewDidLoad() {
super.viewDidLoad()
self.user = FIRAuth.auth()?.currentUser!
self.ref = FIRDatabase.database().reference()
self.chatRef = self.ref.child("privateChats").child(self.user.uid).child(self.chatId!)
self.senderOpenChatRef = self.ref.child("openChatMessages").child(self.user.uid).child(self.chatId!)
self.receiverOpenChatRef = self.ref.child("openChatMessages").child(self.receiverId!).child(self.chatId!)
}
func sendMessage(text: String) {
var messageObject = [String: AnyObject]()
messageObject["text"] = text
messageObject["timestamp"] = FIRServerValue.timestamp()
messageObject["senderEmail"] = self.user.email
messageObject["senderName"] = self.user.displayName
messageObject["senderId"] = self.user.uid
let messageId = self.ref.child("privateChats").child(self.user.uid).child(self.chatId!).childByAutoId().key
let childUpdates = [
"/privateChats/\(self.user.uid)/\(self.chatId!)/\(messageId)": messageObject,
"/privateChats/\(self.receiverId!)/\(self.chatId!)/\(messageId)": messageObject
]
self.ref.updateChildValues(childUpdates, withCompletionBlock: { (error, ref) -> Void in
if error != nil {
print("childUpdates error:\(error)")
return
}
JSQSystemSoundPlayer.jsq_playMessageSentSound()
self.finishSendingMessage()
self.updateOpenChats(text)
})
}
func updateOpenChats(text: String) {
// update the receivers openChatObject with increasing the counter
self.receiverOpenChatRef.runTransactionBlock({ (currentData: FIRMutableData) -> FIRTransactionResult in
var openChatObject = [String: AnyObject]()
// update openChatObject with the latest information from currentData
if currentData.hasChildren() {
openChatObject = currentData.value as! [String: AnyObject]
}
openChatObject["text"] = text
openChatObject["timestamp"] = FIRServerValue.timestamp()
openChatObject["senderEmail"] = self.user.email
openChatObject["senderName"] = self.user.displayName
openChatObject["senderId"] = self.user.uid
var counter = openChatObject["counter"] as? Int
if counter == nil {
counter = 1
} else {
counter = counter! + 1
}
openChatObject["counter"] = counter
currentData.value = openChatObject
return FIRTransactionResult.successWithValue(currentData)
}) { (error, committed, snapshot) in
if let error = error {
print("updateOpenChats: \(error.localizedDescription)")
}
}
// update your (the sender's) openChatObject with setting the counter to zero
self.senderOpenChatRef.runTransactionBlock({ (currentData: FIRMutableData) -> FIRTransactionResult in
var openChatObject = [String: AnyObject]()
// update openChatObject with the latest information from currentData
if currentData.hasChildren() {
openChatObject = currentData.value as! [String: AnyObject]
}
openChatObject["text"] = text
openChatObject["timestamp"] = FIRServerValue.timestamp()
openChatObject["senderEmail"] = self.receiverEmail
openChatObject["senderName"] = self.receiverName
openChatObject["senderId"] = self.receiverId
openChatObject["counter"] = 0
currentData.value = openChatObject
return FIRTransactionResult.successWithValue(currentData)
}) { (error, committed, snapshot) in
if let error = error {
print(error.localizedDescription)
}
}
}
}
EDIT:バグはまだ発生し、私の最初の答えから私の期待に
反して。私はそれが接続と関係があると思いますか?例えば。接続が良好でない場合、トランザクションを実行するのに時間がかかることがあります。しかし、ルータのすぐ隣に座っているときにも起こることがあります。他のノードはトランザクションに書き込まれますが、トランザクションには書き込まれません。このような状況でアプリを再起動すると、アプリは再び動作を開始します。だから私はフードの下で何かが間違っていると思う。
この問題の解決法を高く評価します。受信者が新しいメッセージについて時々通知されないチャットアプリでは、何もしません。
回避策もあります:カウンターを増やしたいときにトランザクションが実際に必要ですか? text
,senderId
またはtimestamp
のような他のデータをsetValue
で更新できますが、両方のユーザーが同時にサブノードの値を設定しようとすると、データが破損する可能性がありますか?
ここに私の最新のコードです:
func sendMessage(text: String?, video: NSURL?, image: UIImage?) {
var messageObject = [String: AnyObject]()
messageObject["text"] = text
messageObject["timestamp"] = FIRServerValue.timestamp()
messageObject["senderEmail"] = self.user.email
messageObject["senderName"] = self.user.displayName
messageObject["senderId"] = self.user.uid
func completeSending() {
let messagesRef = self.ref.child("messages").child(self.chatId!).childByAutoId()
messagesRef.setValue(messageObject)
JSQSystemSoundPlayer.jsq_playMessageSentSound()
if let _ = image {
self.updateOpenChats(" Photo")
} else if let text = text {
self.updateOpenChats(text)
}
self.finishSendingMessageAnimated(true)
}
if let image = image { // if an image is being sent
let data: NSData = UIImageJPEGRepresentation(image, 0.37)!
let fileName = "image_\(NSDate().timeIntervalSince1970).jpg"
let chatImagesRef = storageRef.child("chatImages/\(self.chatId!)/\(fileName)")
let uploadTask = chatImagesRef.putData(data, metadata: nil) { metadata, error in
if (error != nil) {
print(error)
return
}
}
uploadTask.observeStatus(.Failure) { snapshot in
ProgressHUD.showError("Uploading image failed.")
}
uploadTask.observeStatus(.Success) { snapshot in
let imageUrl = snapshot.reference
messageObject["imageUrl"] = String(imageUrl)
completeSending()
}
} else { // if it's just a text message
completeSending()
}
}
func updateOpenChats(text: String) {
self.receiverChatRef.runTransactionBlock({ (currentData: FIRMutableData) -> FIRTransactionResult in
var openChatObject = [String: AnyObject]()
if currentData.hasChildren() {
openChatObject = currentData.value as! [String: AnyObject]
}
openChatObject["text"] = text
openChatObject["timestamp"] = FIRServerValue.timestamp()
openChatObject["senderEmail"] = self.user.email
openChatObject["senderName"] = self.user.displayName
openChatObject["senderId"] = self.user.uid
openChatObject["pushId"] = Database.pushId
var counter = openChatObject["counter"] as? Int
if counter == nil {
counter = 1
} else {
counter = counter! + 1
}
openChatObject["counter"] = counter
// Set value and report transaction success
currentData.value = openChatObject
return FIRTransactionResult.successWithValue(currentData)
}) { (error, committed, snapshot) in
if let error = error {
print("updateOpenChats: \(error.localizedDescription)")
}
}
self.senderChatRef.runTransactionBlock({ (currentData: FIRMutableData) -> FIRTransactionResult in
var openChatObject = [String: AnyObject]()
if currentData.hasChildren() {
openChatObject = currentData.value as! [String: AnyObject]
}
openChatObject["text"] = text
openChatObject["timestamp"] = FIRServerValue.timestamp()
openChatObject["senderEmail"] = self.receiver.email
openChatObject["senderName"] = self.receiver.name
openChatObject["senderId"] = self.receiver.uid
openChatObject["counter"] = 0
// Set value and report transaction success
currentData.value = openChatObject
return FIRTransactionResult.successWithValue(currentData)
}) { (error, committed, snapshot) in
if let error = error {
print(error.localizedDescription)
}
}
}
私は今同じ問題を抱えています。どんな解決策ですか? –
@ MJQZ1347私もこの問題を抱えています。 –