let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: realmURL))
Realm.asyncOpen(configuration: config) { realm, error in
if let realm = realm {
// Realm successfully opened, with all remote data available
}
else if let error = error {
// Handle error that occurred while opening or downloading the contents of the Realm
}
}
I used the above code to get Asynchronously Opening Realm, but its not working without internet.
As per realm Documents
In addition, synchronized Realms wait for all remote content available
at the time the operation began to be downloaded and available
locally.
syncConfiguration: will wait for all remote content available
For Example:
let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: realmURL))
Realm.asyncOpen(configuration: config) { realm, error in
if let realm = realm {
// Realm successfully opened, with all remote data available
} else if let error = error {
// Handle error that occurred while opening or downloading the contents of the Realm
}
}
Related
I have a video sharing app, and when you save a video to firebase storage it works perfectly for videos that are roughly 1 minute or shorter.
The problem that I am having, is when I try to post a longer video (1 min or greater) it never saves to firebase.
The only thing that I can think of is this error that I am getting, and this error only shows up about 30 seconds after I click the save button:
[BackgroundTask] Background Task 101 ("GTMSessionFetcher-firebasestorage.googleapis.com"), was created over 30 seconds ago. In applications running in the background, this creates a risk of termination. Remember to call UIApplication.endBackgroundTask(_:) for your task in a timely manner to avoid this.
Here is my code to save the video to firebase.
func saveMovie(path: String, file: String, url: URL) {
var backgroundTaskID: UIBackgroundTaskIdentifier?
// Perform the task on a background queue.
DispatchQueue.global().async {
// Request the task asseration and save the ID
backgroundTaskID = UIApplication.shared.beginBackgroundTask(withName: "Finish doing this task", expirationHandler: {
// End the task if time expires
UIApplication.shared.endBackgroundTask(backgroundTaskID!)
backgroundTaskID = UIBackgroundTaskIdentifier.invalid
})
// Send the data synchronously
do {
let movieData = try Data(contentsOf: url)
self.storage.child(path).child("\(file).m4v").putData(movieData)
} catch let error {
fatalError("Error saving movie in saveMovie func. \(error.localizedDescription)")
}
//End the task assertion
UIApplication.shared.endBackgroundTask(backgroundTaskID!)
backgroundTaskID = UIBackgroundTaskIdentifier.invalid
}
}
Any suggestions on how I can allow my video time to upload?
Finally figured this out after a long time...
All you have to do is use .putFile("FileURL") instead of .putdata("Data"). Firebase documentation says you should use putFile() instead of putData() when uploading large files.
But the hard part is for some reason you can't directly upload the movie URL that you get from the didFinishPickingMediaWithInfo function and firebase will just give you an error. So what I did instead was get the data of the movie, save the movie data to a path in the file manager, and use the file manager path URL to upload directly to firebase which worked for me.
//Save movie to Firestore
do {
// Convert movie to Data.
let movieData = try Data(contentsOf: movie)
// Get path so we can save movieData into fileManager and upload to firebase because movie URL does not work, but fileManager url does work.
guard let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent(postId!) else { print("Error saving to file manager in addPost func"); return }
do {
try movieData.write(to: path)
// Save the file manager url file to firebase storage
Storage.storage().reference().child("Videos").child("\(postId!).m4v").putFile(from: path, metadata: nil) { metadata, error in
if let error = error {
print("There was an error \(error.localizedDescription)")
} else {
print("Video successfully uploaded.")
}
// Delete video from filemanager because it would take up too much space to save all videos to file manager.
do {
try FileManager.default.removeItem(atPath: path.path)
} catch let error {
print("Error deleting from file manager in addPost func \(error.localizedDescription)")
}
}
} catch let error {
print("Error writing movieData to firebase \(error.localizedDescription)")
}
} catch let error {
print("There was an error adding video in addPost func \(error.localizedDescription)")
}
Basically, I want to handle a case where any device got SyncError with type ClientResetError then, want my device to re-login to realm again. but as per documentation, we have to closeRealmSafely before I login to realm again, but I am not sure how to close realm safely.
I am going through the doc (https://docs.realm.io/sync/using-synced-realms/errors#client-reset) to handle client reset error and found it's very confusing . I want help to understand about the following code.
First there is no method available to closeRealmsafely. Please help me understand how can I close the realm safely?
How can I backup and when I will use it? Should I skip the reset error because in documentation it's mentions if the client reset process is not manually initiated, it will instead automatically take place after the next time the app is launched, upon first accessing the SyncManager singleton. It is the app’s responsibility to persist the location of the backup copy if needed, so that the backup copy can be found later."
Below is the error handler sample code from the doc.
let syncError = error as! SyncError
switch syncError.code {
case .clientResetError:
if let (path, clientResetToken) = syncError.clientResetInfo() {
closeRealmSafely()
saveBackupRealmPath(path)
SyncSession.immediatelyHandleError(clientResetToken)
}
default:
// Handle other errors...
()
}
}```
Finally we figured out how to handle the client reset error. We have taken following steps To avoid the data loss incase user is offline and came online and got reset error.
Save the local realm to another directory
Invalidate and nil the realm
Initiate realm manual reset - Call SyncSession.immediatelyHandleError with clientResetToken passed and it will delete the existing realm from directory
Show client reset alert - This will intimate user to relaunch the app.
On next launch realm creates a fresh realm from ROS.
After new realm connects, restore the realm records (if any) from the old realm saved in backup directory above.
Delete the backup realm(old realm) from directory.
switch syncError.code {
case .clientResetError:
if let (path, clientResetToken) = syncError.clientResetInfo() {
// taking backup
backUpRealm(realm: yourLocalRealm)
// making realm nil and invalidating
yourLocalRealm?.invalidate()
yourLocalRealm = nil
//Initiate realm manual reset - Call `SyncSession.immediatelyHandleError` with `clientResetToken` passed and it will delete the existing realm from directory
SyncSession.immediatelyHandleError(clientResetToken)
// can show alert to user to relaunch the app
showAlertforAppRelaunch()
}
default:
// Handle other errors...
()
}
}```
The back up realm code look like this:
func backUpRealm(realm: Realm?) {
do {
try realm?.writeCopy(toFile: backupUrl)
} catch {
print("Error backing up data")
}
}
After doing this backup will be available at backup path. On next launch device will connect and download a fresh realm from ROS so after device connects restore the realm records from the backup realm saved in the backup path.
The restore merge backup code will look like this. place the below method when realm connects after relauch.The ```restoredRealm`` is fresh downloaded realm on launch
func restoreAndMergeFromBackup(restoredRealm: Realm?) {
let realmBackUpFilePath = isRealmBackupExits()
// check if backup exists or not
if realmBackUpFilePath.exists {
let config = Realm.Configuration(
fileURL: URL(fileURLWithPath: realmBackUpFilePath.path),
readOnly: true)
let realm = try? Realm(configuration: config)
guard let backupRealm = realm else { return }
//Get your realm Objects
let objects = backupRealm.objects(YourRealmObject.self)
try? restoredRealm?.safeWrite {
for object in objects {
// taking local changes to the downloaded realm if it has
restoredRealm?.create(YourRealmObject.self, value: object, update: .modified)
}
self.removeRealmFiles(path: realmBackUpFilePath.path)
}
} else {
debug("backup realm does not exists")
}
}
private func isRealmBackupExits() -> (exists: Bool, path: String) {
let documentsPath = URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let realmPathComponent = documentsPath.appendingPathComponent("your_backup.realm")
let filePath = realmPathComponent.path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath) {
return (true, filePath)
}
return (false, "")
}
private func removeRealmFiles(path: String) {
let realmURL = URL(fileURLWithPath: path)
let realmURLs = [
realmURL,
realmURL.appendingPathExtension("lock"),
realmURL.appendingPathExtension("realm"),
realmURL.appendingPathExtension("management")
]
for URL in realmURLs {
do {
try FileManager.default.removeItem(at: URL)
} catch {
debug("error while deleting realm urls")
}
}
}```
In our testing we have found that there is a backup made by realm automatically so we deleted it for safety purpose. the path argument you will get in the if let (path, clientResetToken) = syncError.clientResetInfo()
func removeAutoGeneratedRealmBackUp(path: String) {
do {
try FileManager.default.removeItem(at: URL(fileURLWithPath: path))
} catch {
debug("error while deleting realm backUp path \(path)")
}
}
I have connected my App with the Firebase Storage where my 19ea PDF files exists.
I would like to download those files and save them locally for future use.
Those PDF files will be used inside UIWebviews but they may need to be updated in time. Therefore, I have configured version control system with Firebase Database, so I will be able to push the newer versions when I update the files in the storage.
So, how I can save those files locally? (to a folder like: user/myapp/Documents/PDF etc?)
Also, how I can check if that folder contains any documents and how to delete them before downloading new files?
Here is what I have got so far.
I appreciate all the help.
// Firebase Storage Connection
static var refStorage:FIRStorageReference?
static var dataPDF = [NSData]()
func newDataDownload(){
// Compare Current Data Version with Online Data Version
if myFirebaseData.localDataVersion < myFirebaseData.onlineDataVersion {
// Set Firebase Storage Reference
myFirebaseData.refStorage = FIRStorage.storage().reference()
for i in 1...myFirebaseData.onlineTotalPDFCount {
// Create a reference to the file you want to download
let pulledPDF = FIRStorage.storage().reference().child("/PDF/\(i).pdf")
// Create local filesystem URL
let localURL = URL(string: "myApp/Documents/PDF/\(i)")!
pulledPDF.data(withMaxSize: myFirebaseData.maxPDFdownloadSize, completion: { (downPDF, err) in
if err == nil {
// Accessed the data
myFirebaseData.dataPDF.append(downPDF! as NSData)
print(myFirebaseData.dataPDF)
} else {
// If there is an error print it
print(err.debugDescription)
}
})
}
}
// If Data is successfully downloaded update Local Data Version
myFirebaseData.localDataVersion = myFirebaseData.onlineDataVersion
Use storageRef.write(toFile: completion:) (docs), like:
// Create a reference to the file you want to download
let pdfRef = storageRef.child("files/file.pdf")
// Create local filesystem URL
let localURL = URL(string: "path/to/local/file.pdf")!
// Download to the local filesystem
let downloadTask = pdfRef.write(toFile: localURL) { url, error in
if let error = error {
// Uh-oh, an error occurred!
} else {
// Local file URL for "path/to/local/file.pdf" is returned
}
}
Note that you can only write to /tmp and /Documents due to app sandboxing requirements (see Downloading Firebase Storage Files Device Issue for an example of how this fails otherwise).
I am new to Realm and I want to ship a pre bundled Realm file my app, however the realm documentation is unclear to me on how to actually create a .realm file and also upload the desired pre bundled data to it. I have not been able to find any solution via SO, Google, or Youtube. Step-by-step instructions would be very helpful.
We're still looking at ways to officially make generating pre-populated Realms more easy. It's definitely a desired feature for the Realm Browser, but due to the way that Realm files require a migration when changing the schema, it's somewhat tricky to incorporate into a UI. It's definitely something we want to improve down the line.
At the moment, the Browser has a converter in it that can perform minimal data import like CSV files.
The Realm documentation is saying that the easiest way for you to produce a pre-populated Realm specific for your apps needs is to build a separate macOS app whose sole role is to generate the Realm file, pre-populate the data and then expose the resulting Realm file so you can copy it to your app.
The operation to do this is just like any normal Realm interaction (try! Realm() is what causes the file to actually be initially created), except you manually interact with the Realm file on disk upon completion.
I'm working on an app for an iOS conference, and the schedule data for the event is going to be stored in a Realm that is pre-bundled with the app when it ships.
Since I thought creating an extra macOS app would be overkill for an iOS app, I instead used iOS unit tests that would generate the pre-bundled Realm from scratch every time it was executed.
class Tests: XCTestCase {
func testGenerateNewDefaultRealm() {
let sources = [conferences, sponsors, conferenceDays] as [Any]
XCTAssert(generateDefaultRealm(named: "MyConferenceRealm.realm", sources: sources))
}
}
extension Tests {
public func generateDefaultRealm(named name: String, sources: [Any]) -> Bool {
// Create and configure the Realm file we'll be writing to
let realm = generateRealm(named: name)
// Open a Realm write transaction
realm.beginWrite()
// Loop through each source and add it to Realm
for source in sources {
if let objectArray = source as? [Object] {
for object in objectArray {
realm.add(object)
}
}
else if let objectDictionary = source as? [String : Object] {
for (_, object) in objectDictionary {
realm.add(object)
}
}
}
// Commit the write transaction
do {
try realm.commitWrite()
}
catch let error {
print(error.localizedDescription)
return false
}
// Print the file location of the generated Realm
print("=====================================================================")
print(" ")
print("Successfully generated at")
print(realm.configuration.fileURL!.path)
print(" ")
print("=====================================================================")
return true
}
public func generateRealm(named name: String) -> Realm {
let exportPath = NSTemporaryDirectory()
let realmPath = exportPath.appending(name)
// Delete previous Realm file
if FileManager.default.fileExists(atPath: realmPath) {
try! FileManager.default.removeItem(atPath: realmPath)
}
// Create new Realm file at path
let objectTypes: [Object.Type] = [Conference.self, ConferenceDay.self, SessionBlock.self, Event.self, Presentation.self,
Session.self, Location.self, Speaker.self, Sponsor.self, Venue.self]
let configuration = Realm.Configuration(fileURL: URL(string: realmPath), objectTypes: objectTypes)
let realm = try! Realm(configuration: configuration)
return realm
}
}
Running this unit test will generate a new Realm file in the NSTemporaryDirectory() directory of the Mac, and then feed in a set of Array and Dictionary objects of un-persisted Realm Object instances that are created each time the test is run. The location of the final Realm is then printed in the console so I can grab it and move it to the app bundle.
I have set up a Realm Object Server on AWS (RHAT) and it appears to be working fine. I can look at the dashboard which tells me how many connections, and how many realms open on port 9080. My code is working fine on the device, updates are happening on the devices realm. But I dont see anything changing in the ROS realm. I may be getting something very basic wrong, but I can't tell what.
func setupRealm() {
// Authenticating the User
let username = "exampleuser"
let password = "examplepassword"
SyncUser.logInWithCredentials(SyncCredentials.usernamePassword(username, password: password), authServerURL: NSURL(string: "http://example.com:9080")!, onCompletion:
{ user, error in
if let user = user {
// Opening a remote Realm
let realmURL = NSURL(string: "realm://example.com:9080/~/VWF3")!
let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: realmURL))
let realm = try! Realm(configuration: config)
// Any changes made to this Realm will be synced across all devices!
} else if let error = error {
// handle error
}
})
}
I call setupRealm() from ViewDidLoad.
My developers need to be able to see the changes to the ROS realm to ensure all is working correctly, but all that is there is the single users realm, structure of tables is accurate, zero data.
I checked the log files on the server and nothing stood out.
Matt
You need to make sure you're still referring to that particular Realm (and its sync configuration) when doing your writes. If you tried to do a write to let realm = try! Realm() even after this login, you'd still be referencing your default Realm, which isn't synchronized.
If you plan to make your entire app synchronized, you can set that particular Configuration as your default Realm's one:
if let user = user {
// Opening a remote Realm
let realmURL = NSURL(string: "realm://example.com:9080/~/VWF3")!
let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: realmURL))
Realm.Configuration.defaultConfiguration = configuration
// All calls to `Realm()` will now use this configuration
}
Otherwise you can always just generate the configuration when you need it (Or have a global constants class that can manage it for you).
let realmURL = NSURL(string: "realm://example.com:9080/~/VWF3")!
let configuration = Realm.Configuration()
configuration.syncConfiguration = SyncConfiguration(user: SyncUser.current, realmURL: realmURL))
let realm = try! Realm(configuration: configuration)