Notification action background task not running as expected - ios

Question

UPDATE
After some comments I changed the resolveVisita method to use URLSession in the background, but it looks like the background session will only start when the app is in the foreground, here is the updated method that runs when a notification action is tapped:
static func resolverVisita(idMensagem: String, resposta: String, liberar: Bool, view: UIViewController?) {
//let configuration = URLSessionConfiguration.background(withIdentifier: "url_session_resolve_visita")
//var backgroundSession = URLSession(configuration: configuration)
// Set up the URL request
let todoEndpoint: String = URL_RESPONDE_VISITA
guard let url = URL(string: todoEndpoint) else {
print("Error: cannot create URL")
return
}
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let postString = "userUUID=\(SessionManager.getUsrUUID())&devUUID=\(devUUID)&msgID=\(idMensagem)&tarefa=\(liberar ? "L" : "B")&resposta=\(resposta)"
urlRequest.httpBody = postString.data(using: .utf8)
let config = URLSessionConfiguration.background(withIdentifier: "\(Bundle.main.bundleIdentifier!).responde_visita")
let session = URLSession(configuration: config)
/*
let task = URLSession.shared.dataTask(with: urlRequest) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(responseString)")
}*/
let task = session.dataTask(with: urlRequest)
task.resume()
}
The commented out code seem to work sometimes, but it looks like it is not the right way of doing it.
UPDATE END
So i have an application that receives notification and it has 2 actions, and upon user response the app should send a response to the server, preferable on the background.
I am facing an issue where whenever an action is tapped, sometimes the userNotificationCenter method is not called until the app is opened, and sometimes it does run, but the Alamofire server call does not get processed, and then if i open the app some errors are shown in the console regarding the Alamofire call, however if i tap the action then open the app quick enough it works as expected.
I already enabled Background Fetch and Remote notifications under the app capabilities on Xcode.
This is how I am creating the actions for the notification:
let liberar = UNTextInputNotificationAction(identifier:"liberar", title:"Liberar",options:[.authenticationRequired],
textInputButtonTitle: "Liberar",
textInputPlaceholder: "Resposta")
let bloquear = UNTextInputNotificationAction(identifier: "bloquear", title: "Bloquear", options: [.destructive],
textInputButtonTitle: "Bloquear",
textInputPlaceholder: "Resposta")
Here is my UNUserNotificationCenterDelegate protocol implementation:
extension AppDelegate : UNUserNotificationCenterDelegate {
// Receive displayed notifications for iOS 10 devices.
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
let userInfo = notification.request.content.userInfo
// With swizzling disabled you must let Messaging know about the message, for Analytics
// Messaging.messaging().appDidReceiveMessage(userInfo)
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: \(messageID)")
}
// Print full message.
print(userInfo)
// Change this to your preferred presentation option
completionHandler([.alert, .badge, .sound])
}
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: #escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
let acao = response.actionIdentifier
//let request = response.notification.request
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: \(messageID)")
}
print(acao)
if acao == "liberar" {
// Print full message.
let textResponse = response as! UNTextInputNotificationResponse
print("Liberando Visita")
AppConfig.resolverVisita(idMensagem: (userInfo["msgid"] as? String)!, resposta: textResponse.userText, liberar: true, view: nil)
}
else if acao == "bloquear" {
let textResponse = response as! UNTextInputNotificationResponse
print("Bloqueando Visita")
AppConfig.resolverVisita(idMensagem: (userInfo["msgid"] as? String)!, resposta: textResponse.userText, liberar: false, view: nil)
//let newContent = request.content.mutableCopy() as! UNMutableNotificationContent
//print(textResponse.userText)
}
completionHandler()
}}
And here is the resolveVisita method, it basically just gathers some data and send it via a POST request using Alamofire.
static func resolverVisita(idMensagem: String, resposta: String, liberar: Bool, view: UIViewController?) {
if view != nil {
showLoading(mensagem: NSLocalizedString("Processando...", comment: ""), view: view!)
}
//Parameters to be sent
let parameters: Parameters=[
"userUUID":SessionManager.getUsrUUID(),
"devUUID":devUUID,
"msgID": idMensagem,
"resposta": resposta,
"tarefa": liberar ? "L" : "B"
];
//Sending http post request
Alamofire.request(URL_RESPONDE_VISITA, method: .post, parameters: parameters).responseJSON{
response in
//printing response
print(response)
//getting the json value from the server
if let result = response.result.value {
//converting it as NSDictionary
let jsonData = result as! NSDictionary
var mensagem : String = "Solicitacao resolvida com sucesso"
//displaying the message in label
if((jsonData["error"] as! Bool)){
mensagem = jsonData["error_msg"] as! String
if view == nil {
Notificacoes.notificaErroSolicitavao(msgId: idMensagem, errMsg: mensagem)
}
}
if view != nil {
view?.dismiss(animated: false){
showAlert(mensagem: NSLocalizedString(mensagem, comment: ""), view: view!, okMsg: NSLocalizedString("Voltar", comment: ""), segue: "voltarParaLogin")
}
}
else{
print(mensagem)
}
}
}
}
If I just add the .foreground option to the actions making the app open once it is selected, the problem is solved however I really think it would not be necessary for the app to be open for this task.

Answer 1

So after some time I've decided to come back to this issue with a fresh mind, and I discovered what I was doing wrong, I Was trying to create my Instance of the URLSession in the background from the lock screen, and also creating a new instance of the "same Session", to resolve this, all I had to do was create a static instance of the URLSession and use it afterwards whenever I need it.
I created it this way.
static let resolveVisitaSession = URLSession(configuration: URLSessionConfiguration.background(withIdentifier: "br.com.freaccess.resolveVisitaRequest"))
And this is the method that gets called upon the selection on a UNNotificationAction I use my URLSession in there.
static func resolverVisita(idMensagem: String, resposta: String, liberar: Bool) {
print("Entered resolveVisita method")
// Set up the URL request
let todoEndpoint: String = URL_RESPONDE_VISITA
guard let url = URL(string: todoEndpoint) else {
print("Error: cannot create URL")
return
}
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let postString = "userUUID=\(SessionManager.getUsrUUID())&devUUID=\(devUUID)&msgID=\(idMensagem)&tarefa=\(liberar ? "L" : "B")&resposta=\(resposta)&skipSocket=true"
urlRequest.httpBody = postString.data(using: .utf8)
resolveVisitaSession.dataTask(with: urlRequest).resume()
}