“Operation canceled” Realm Error Domain=io.realm.unknown Code=89 - ios

Question

I get the exact same error as #62999928, but not with the same configuration. I'm just trying to access a global Realm file which is on my Realm Cloud (I am NOT on MongoDB and the beta).
I get the “Operation canceled” Realm Error Domain=io.realm.unknown Code=89 error when I try to open the Realm.
Realm Studio:
Opening code:
let url = URL(string: "realms://\(MY_INSTANCE_ADDRESS)/common")!
let config = user.configuration(realmURL: url, fullSynchronization: true)
Realm.asyncOpen(configuration: config) { ... }
Authentication code (using PromiseKit):
private func connectToRealm(_ firebaseUser: User) -> Promise<SyncUser> {
// if realm user already logged in, check if it's the right user
if let user = SyncUser.current {
guard user.identity == firebaseUser.uid else {
// it's not the right user. log out and try again.
user.logOut()
return connectToRealm(firebaseUser)
}
// it's the right user.
return Promise.value(user)
}
return firstly {
// get JWT token with firebase function
Promise {
Functions.functions().httpsCallable("myAuthFunction").call(completion: $0.resolve)
}
}
.compactMap { result in
// extract JWT token from response
return (result?.data as? [String: Any])?["token"] as? String
}
.then { token in
// connect to Realm
Promise {
SyncUser.logIn(with: SyncCredentials.jwt(token), server:MY_AUTH_URL, onCompletion: $0.resolve)
}
}
}
This method is called after logging with Firebase. The auth URL is just https://\(MY_INSTANCE_ADDRESS).
I suspect it's a permission problem, in which case: how can I easily let this file be readable by everyone, but not writable? I'm not planning on creating a lot of theses files, I just want to do this once.
EDIT: I reduced my code to the bare minimum.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let MY_INSTANCE_ADDRESS = [...]
let AUTH_URL = URL(string: "https://\(MY_INSTANCE_ADDRESS)")!
let COMMON_REALM_URL = URL(string: "realms://\(MY_INSTANCE_ADDRESS)/common")!
SyncUser.logIn(with: SyncCredentials.anonymous(), server: AUTH_URL) { (user, error) in
guard error == nil && user != nil else {
print(error)
return
}
let config = user!.configuration(realmURL: COMMON_REALM_URL, fullSynchronization: true)
Realm.asyncOpen(configuration: config) { (realm, error) in
guard error == nil && realm != nil else {
print(error)
return
}
print("Successfully loaded Realm file with \(realm!.objects(MyObjectType.self).count) objects.")
}
}
}
Nothing else is running, I don't load my app window. Still getting the same error.
EDIT 2: changed code according to #Jay's comment.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let MY_INSTANCE_ADDRESS = [...]
let AUTH_URL = URL(string: "https://\(MY_INSTANCE_ADDRESS)")!
let COMMON_REALM_URL = URL(string: "realms://\(MY_INSTANCE_ADDRESS)/common")!
SyncUser.logIn(with: SyncCredentials.anonymous(), server: AUTH_URL) { (user, error) in
guard error == nil && user != nil else {
print(error)
return
}
print("logged in")
let config = SyncUser.current?.configuration(realmURL: COMMON_REALM_URL, fullSynchronization: true)
let realm = try! Realm(configuration: config!)
// $$$
let objectsResult = realm.objects(MyObjectType.self)
self.notificationToken = objectsResult.observe { changes in
print("changes: \(changes)")
if case .initial(let results) = changes {
print("\(results.count) results: \(results)")
}
}
// $$$
}
}
Result:
logged in
changes: initial(Results<MyObjectType> <0x155d2d4e0> (
))
0 results: Results<MyObjectType> <0x155d2d4e0> (
)
No error, but I don't get the content that are on the cloud.
EDIT 3 Okay that's interesting. By changing the code between the $$$ to:
try! realm.write {
realm.create(MyObjectType.self, value: MyObjectType(id: 2021, name_fr: "test_fr", name_eng: "test_eng"))
}
let objectsResult = realm.objects(MyObjectType.self)
print(objectsResult)
I get the result:
logged in
Results<MyObjectType> <0x143fe0510> (
[0] MyObjectType {
id = 2020;
name_fr = test_fr;
name_eng = test_eng;
}
)
So the object is being written. When I run again the same code (without the login part) and changing the object id, I get:
Results<MyObjectType> <0x111d507c0> (
[0] MyObjectType {
id = 2020;
name_fr = test_fr;
name_eng = test_eng;
},
[1] MyObjectType {
id = 2021;
name_fr = test_fr;
name_eng = test_eng;
}
)
So the objects are stored somewhere. However, I don't see these two objects in Realm Studio. In Realm Studio, I see the objects that I added using a JS script, which should be downloaded to the device but are not.
When I run again the code after logging out, the objects are removed. All the URLs are correct, and I checked that no other Realm file is created by running the code.