Now I'm developing the function using DispatchQueue and Cloud functions.
When I call it, DispatchQueue takes too much time, more than I expected.
And a function in DispatchQueue can't wait for the result from cloud functions.
Find the code below:
func createGroup(members: [String]) {
guard let userId = Auth.auth().currentUser?.uid else { return }
var ref: DocumentReference? = nil
let data =
[
"members": []
] as [String: Any]
ref = COLLECTION_GROUP.addDocument(data: data) {
err in
if let err = err {
print("Error adding document: \(err)")
} else {
print("Document added with ID: \(ref!.documentID)")
if !members.isEmpty {
self.provisionNewAccount(members: members)
}
}
}
}
func provisionNewAccount(members: [String]) {
DispatchQueue.main.async {
members.forEach { member in
self.functions.httpsCallable("hello").call(["email": member]) { (result, error) in
if let error = error as NSError? {
if error.domain == FunctionsErrorDomain {
let code = FunctionsErrorCode(rawValue: error.code)
let message = error.localizedDescription
let details = error.userInfo[FunctionsErrorDetailsKey]
print(code)
print(message)
print(details)
}
}
print(result?.data)
if let data = (result?.data as? [String: Any]), let text = data["result"] as? String {
print("SUCCESS: \(text)")
}
}
}
}
}
Related
I am trying to detect loss of connection to my web socket in Swift. I have very little understanding of web sockets but I have tried googling for information but with little success. Here is my custom class providing a web socket service;
//
// Services.swift
// BetVictorTask
//
// Created by Stephen Learmonth on 28/02/2022.
//
import UIKit
protocol NetworkServicesDelegateProtocol: AnyObject {
func sendStockInfo(stocksInfo: [String: StockInfo])
}
class NetworkServices: NSObject, URLSessionWebSocketDelegate {
static let sharedInstance = NetworkServices()
var webSocketTask: URLSessionWebSocketTask?
var stocksInfo: [String: StockInfo] = [:]
var socketResults: [String: [StockInfo]] = [:]
weak var delegate: NetworkServicesDelegateProtocol?
func fetchStockInfo(symbols: [String], delegate: CompanyPriceListVC) {
self.delegate = delegate
let urlSession = URLSession(configuration: .default)
webSocketTask = urlSession.webSocketTask(with: FINNHUB_SOCKET_STOCK_INFO_URL!)
webSocketTask!.resume()
for symbol in symbols {
let string = FINNHUB_SOCKET_MESSAGE_STRING + symbol + "\"}"
let message = URLSessionWebSocketTask.Message.string(string)
webSocketTask!.send(message) { error in
if let error = error {
print("Error sending message: \(error)")
}
self.receiveMessage()
}
}
}
private func receiveMessage() {
self.webSocketTask!.receive { result in
switch result {
case .failure(let error):
print("Error receiving message: \(error)")
case .success(.string(let jsonData)):
guard let stockData = jsonData.data(using: .utf8) else { return }
self.socketResults = [:]
self.stocksInfo = [:]
let decoder = JSONDecoder()
do {
let socketData = try decoder.decode(SocketData.self, from: stockData)
guard let stockInfoData = socketData.data else { return }
for stockInfo in stockInfoData {
let symbol = stockInfo.symbol
if self.socketResults[symbol] == nil {
self.socketResults[symbol] = [StockInfo]()
}
self.socketResults[symbol]?.append(stockInfo)
}
for (symbol, stocks) in self.socketResults {
for item in stocks {
if self.stocksInfo[symbol] == nil {
self.stocksInfo[symbol] = item
} else if item.timestamp > self.stocksInfo[symbol]!.timestamp {
self.stocksInfo[symbol] = item
}
}
}
self.delegate?.sendStockInfo(stocksInfo: self.stocksInfo)
self.receiveMessage()
} catch {
print("Error converting JSON: \(error)")
}
default:
print("default")
}
}
}
func closeWebSocketConnection() {
webSocketTask?.cancel(with: .goingAway, reason: nil)
}
func urlSession(_ session: URLSession, webSocketTask: URLSessionWebSocketTask, didCloseWith closeCode: URLSessionWebSocketTask.CloseCode, reason: Data?) {
print("Got here")
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
guard let error = error as? URLError else { return }
print("got here")
}
func fetchCompanyInfo(symbol: String, completion: #escaping (CompanyInfo?, UIImage?)->()) {
let urlString = FINNHUB_HTTP_COMPANY_INFO_URL_STRING + symbol + "&token=" + FINNHUB_API_TOKEN
guard let url = URL(string: urlString) else { return }
let task = URLSession.shared.dataTask(with: url) { data, response, error in
if let error = error {
print("Error fetching company info: \(error)")
}
guard let data = data else { return }
let decoder = JSONDecoder()
do {
let companyInfo = try decoder.decode(CompanyInfo.self, from: data)
guard let logoURL = URL(string: companyInfo.logo) else { return }
let task = URLSession.shared.dataTask(with: logoURL) { data, response, error in
if let error = error {
print("Error fetching logo image: \(error)")
}
guard let data = data else { return }
guard let logoImage = UIImage(data: data) else { return }
completion(companyInfo, logoImage)
}
task.resume()
} catch {
print("Error decoding JSON: \(error)")
completion(nil, nil)
}
}
task.resume()
}
}
I have tried implementing;
func urlSession(_ session: URLSession, webSocketTask: URLSessionWebSocketTask, didCloseWith closeCode: URLSessionWebSocketTask.CloseCode, reason: Data?) {
print("Got here")
}
and then run the app and turn off WiFi to simulate loss of connection but the urlSession method never gets called.
How can I simulate loss of web socket connection while running my app and detect this disconnection. Also I need to think of a way to reconnect the web socket
Right now I have to call the function (calculatePortfolioGrossBalance) 3 times for the value to update, what am I doing wrong in the state logic?
In the code below, when I call in an init the function calculatePortfolioGrossBalance() it returns empty [], I have to call it 3 times for the value to update, However... if I print the values of getTokenBalancesModel in the line DispatchQueue.main.async { I can see the values are there, so how come in calculatePortfolioGrossBalance are not?
final class TokenBalancesClassAViewModel: ObservableObject {
#Published var getTokenBalancesModel: [TokenBalancesItemsModel] = [TokenBalancesItemsModel]()
#Published var portfolioGrossBalance: String = "0.0"
func calculatePortfolioGrossBalance() {
getTokenBalances()
DispatchQueue.main.async {
var totalBalance: Double = 0
for item in self.getTokenBalancesModel {
totalBalance += Double(item.quote!)
}
self.portfolioGrossBalance = String(format:"%.2f", totalBalance)
print(self.portfolioGrossBalance)
}
}
func getTokenBalances() {
guard let url = URL(string: "someUrlHeidiGaveMe") else {
print("Invalid URL")
return
}
print("Calling getTokenBalances() ...")
AF.request(url, method: .get).validate().responseData(completionHandler: { data in
do {
guard let data = data.data else {
print("Response Error:", data.error as Any)
return
}
let apiJsonData = try JSONDecoder().decode(TokenBalancesModel.self, from: data)
DispatchQueue.main.async {
self.getTokenBalancesModel = apiJsonData.data.items
}
} catch {
print("ERROR:", error)
}
})
}
}
you need to read up on using asynchronous functions, how to set them up and how to use them. This is important. Try something like this (untested):
final class TokenBalancesClassAViewModel: ObservableObject {
#Published var getTokenBalancesModel: [TokenBalancesItemsModel] = [TokenBalancesItemsModel]()
#Published var portfolioGrossBalance: String = "0.0"
func calculatePortfolioGrossBalance() {
getTokenBalances() { isGood in
if isGood {
var totalBalance: Double = 0
for item in self.getTokenBalancesModel {
totalBalance += Double(item.quote!)
}
self.portfolioGrossBalance = String(format:"%.2f", totalBalance)
print(self.portfolioGrossBalance)
}
}
}
func getTokenBalances(completion: #escaping (Bool) -> Void) {
guard let url = URL(string: "someUrlHeidiGaveMe") else {
print("Invalid URL")
completion(false)
return
}
print("Calling getTokenBalances() ...")
AF.request(url, method: .get).validate().responseData(completionHandler: { data in
do {
guard let data = data.data else {
print("Response Error:", data.error as Any)
completion(false)
return
}
let apiJsonData = try JSONDecoder().decode(TokenBalancesModel.self, from: data)
DispatchQueue.main.async {
self.getTokenBalancesModel = apiJsonData.data.items
completion(true)
}
} catch {
print("ERROR:", error)
completion(false)
}
})
}
}
I am changing my online status with this code:
static func online(for uid: String, status: Bool, success: #escaping (Bool) -> Void) {
//True == Online, False == Offline
let db = Firestore.firestore()
let lastTime = Date().timeIntervalSince1970
let onlineStatus = ["onlineStatus" : status]
let lastTimeOnline = ["lastTimeOnline" : lastTime]
let ref = db.collection("users").document(uid)
ref.updateData(lastTimeOnline) {(error) in
if let error = error {
assertionFailure(error.localizedDescription)
success(false)
}
success(true)
}
ref.updateData(onlineStatus) {(error) in
if let error = error {
assertionFailure(error.localizedDescription)
success(false)
}
success(true)
}
}
I update the lastTimeOnline and the onlineStatus.
I listen to this updates via:
// Get the user online offline status
func getUserOnlineStatus(completion: #escaping (Dictionary<String, Any>) -> Void) {
let db = Firestore.firestore()
db.collection("users").addSnapshotListener { (querySnapshot, error) in
guard let snapshot = querySnapshot else {
print("Error fetching snapshots: \(error!)")
return
}
snapshot.documentChanges.forEach { diff in
if (diff.type == .modified) {
//GETS CALLED TWICE BUT I ONLY WANT ONCE
print("modified called..")
guard let onlineStatus = diff.document.get("onlineStatus") as? Bool else {return}
guard let userId = diff.document.get("uid") as? String else {return}
var userIsOnline = Dictionary<String, Any>()
userIsOnline[userId] = [onlineStatus, "huhu"]
completion(userIsOnline)
}
}
}
}
The problem is now, since I use ref.updateData twice, my SnapshotListener .modified returns the desired data twice.
How can I update two fields in a single call, so my .modified just return one snapshot?
You can try to combine them
let all:[String:Any] = ["onlineStatus" : status ,"lastTimeOnline" : lastTime]
let ref = db.collection("users").document(uid)
ref.updateData(all) {(error) in
if let error = error {
assertionFailure(error.localizedDescription)
success(false)
}
success(true)
}
I have a some problem with old syntax like:
metadata?.downloadURL()?.absoluteString"
How to use new way in my code?
Error in this part code:
let downloadURL = metadata?.storageReference?.downloadURLWithCompletion()
Full code:
Storage.storage().reference().child(imgUid).putData(imgData, metadata: metadata) { (metadata, error) in
if error != nil {
print("Did'n upload image")
} else {
print("uploaded")
let downloadURL = metadata?.storageReference?.downloadURLWithCompletion()
if let url = downloadURL {
self.setUser(img: url)
}
}
}
This is a easyway to do this use this Func to save the data to the FirebaseStorage then take the url as a String then you can save it on
func uploadImageToFirebaseStorage(data: Data, onSuccess: #escaping (_ imageUrl: String) -> Void) {
let photoIdString = NSUUID().uuidString
let storageRef = Storage.storage().reference(forURL: Config.STORAGE_REF_URL).child(POST_REF).child(photoIdString)
storageRef.putData(data, metadata: nil) { (metadata, error) in
if let error = error {
debugPrint(error.localizedDescription)
return
}
metadata?.storageReference?.downloadURL(completion: { (url, error) in
if let error = error {
print(error.localizedDescription)
return
}
onSuccess("\(url!)")
})
}
}
func save() {
let newPostRef = Database.database().reference().child("users").childByAutoId()
let newPostKey = newPostRef.key
// 1. save image
if let imageData = self.profilPic!.jpegData(compressionQuality:0.5) {
let storage = Storage.storage().reference().child("profileImages")
DispatchQueue.main.sync {
storage.putData(imageData).observe(.success, handler: { (snapshot) in
storage.downloadURL(completion: { (url, error) in
if error != nil {
print(error!.localizedDescription)
return
}
if let profileImageUrl = url?.absoluteString {
guard let uid = (Auth.auth().currentUser?.uid) else {return}
let values = ["name": self.name, "email": self.email, "profilePictureUrl": profileImageUrl]
newPostRef.setValue(values)
self.ref.child(uid).childByAutoId().setValue(values)
}
})
})
}
}
}
I'm a C# developer convert to Swift tvOs and just starting to learn. I've made some progress, but not sure how to handle nested calls to json. The sources are from different providers so I can't just combine the query.
How do I wait for the inner request to complete so the TVSeries has the poster_path? Is there a better way to add the show to the collection and then process the poster path loading in another thread so it doesn't delay the UI Experience?
func downloadTVData() {
let url_BTV = NSURL(string: BTV_URL_BASE)!
let request_BTV = NSURLRequest(URL: url_BTV)
let session_BTV = NSURLSession.sharedSession()
//get series data
let task_BTR = session_BTV.dataTaskWithRequest(request_BTV) { (data_BTV, response_BTV, error_BTV) -> Void in
if error_BTV != nil {
print (error_BTV?.description)
} else {
do {
let dict_BTV = try NSJSONSerialization.JSONObjectWithData(data_BTV!, options: .AllowFragments) as? Dictionary<String, AnyObject>
if let results_BTV = dict_BTV!["results"] as? [Dictionary<String, AnyObject>]{
for obj_BTV in results_BTV {
let tvshow = TVSeries(tvDict: obj_BTV)
//for each tv series try to load a poster_path from secondary provider
if let str = obj_BTV["title"] as? String!{
let escapedString = str?.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet())!
if let url = NSURL(string: self.SEARCH_URL_BASE + escapedString!) {
let request = NSURLRequest(URL: url)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(request) { (data, response, error) -> Void in
if error != nil {
print (error?.description)
} else {
do {
let dict = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as? Dictionary<String, AnyObject>
if let results = dict!["results"] as? [Dictionary<String, AnyObject>] {
//iterate through the poster array
for obj in results {
if let path = obj["poster_path"] as? String {
tvshow.posterPath = path
break
}
}
}
} catch let error as NSError {
print(error.description)
}
}
}
task.resume()
}
}
self.tvSeries.append(tvshow)
}
dispatch_async(dispatch_get_main_queue()){
self.collectionView.reloadData()
}
}
} catch let error as NSError {
print(error.description)
}
}
}
task_BTR.resume()
}
Thanks for your help!
I would recommend breaking things apart into multiple methods, with callbacks to sequence the operations, and utilizing Swift's built-in throws error handling mechanism. Here's an example, not perfect, but might help as a starting point:
class TVSeries
{
let title: String
var posterPath: String?
enum Error: ErrorType {
case MalformedJSON
}
init(tvDict: [String: AnyObject]) throws
{
guard let title = tvDict["title"] as? String else {
throw Error.MalformedJSON
}
self.title = title
}
static func loadAllSeries(completionHandler: [TVSeries]? -> Void)
{
NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: BTV_URL_BASE)!) { data, response, error in
guard let data = data else {
print(error)
completionHandler(nil)
return
}
do {
completionHandler(try fromJSONData(data))
}
catch let error {
print(error)
}
}.resume()
}
static func fromJSONData(jsonData: NSData) throws -> [TVSeries]
{
guard let dict = try NSJSONSerialization.JSONObjectWithData(jsonData, options: .AllowFragments) as? [String: AnyObject] else {
throw Error.MalformedJSON
}
guard let results = dict["results"] as? [[String: AnyObject]] else {
throw Error.MalformedJSON
}
return try results.map {
return try TVSeries(tvDict: $0)
}
}
func loadPosterPath(completionHandler: () -> Void)
{
guard let searchPath = title.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet()) else {
completionHandler()
return
}
let url = NSURL(string: SEARCH_URL_BASE)!.URLByAppendingPathComponent(searchPath)
NSURLSession.sharedSession().dataTaskWithURL(url) { [weak self] data, response, error in
defer { completionHandler() }
guard let strongSelf = self else { return }
guard let data = data else {
print(error)
return
}
do {
strongSelf.posterPath = try TVSeries.posterPathFromJSONData(data)
}
catch let error {
print(error)
}
}.resume()
}
static func posterPathFromJSONData(jsonData: NSData) throws -> String?
{
guard let dict = try NSJSONSerialization.JSONObjectWithData(jsonData, options: .AllowFragments) as? [String: AnyObject] else {
throw Error.MalformedJSON
}
guard let results = dict["results"] as? [[String: AnyObject]] else {
throw Error.MalformedJSON
}
for result in results {
if let path = result["poster_path"] as? String {
return path
}
}
return nil
}
}
It might also be worth your time to look into something like RxSwift or Alamofire, which help you with these kinds of data-conversion / sequencing operations.