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When using upload/uploadsession I get a sessionDeinitialized from alamofire in Swift

When using upload/uploadsession I get a sessionDeinitialized from alamofire in Swift

Michael-jamf
Helpful | Level 6
Go to solution

When I try to send a test file using either upload or uploadSession I get a sessionDeinitialized error.

I edit the code to generate a file that is larger or smaller than the chunksize to test both of the conditions. This is all the code I have for dropbox. the testDropbox function is referenced in the ContentView where I pass the refreshtoken and appkeysecret. My team has this working in python, all with the same basic functionality.

 

Here is the code

 

import Foundation
import SwiftyDropbox

func testDropbox(token: String, secret: String){
    let session = DropboxManager(refreshToken: token, appKeySecret: secret)
    session.upload(file: NSHomeDirectory() + "/tmp/test2.txt", to: "/uploads")
}

func createDropboxToken(refreshToken:String, appKey:String) -> String {
    
    // Create the command for refreshing the token
    let dbRefreshCMD = "curl https://api.dropbox.com/oauth2/token -s -d grant_type=refresh_token -d refresh_token=\"\(refreshToken)\" -u \"\(appKey)\""
    
    // Execute the command and parse the response
    let task = Process()
    let outputPipe = Pipe()
    task.launchPath = "/bin/sh"
    task.arguments = ["-c", dbRefreshCMD]
    task.standardOutput = outputPipe
    task.launch()
    let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
    let res = try! JSONSerialization.jsonObject(with: outputData, options: []) as! [String: Any]
    print(res)
    
    // Print a message indicating that the Dropbox access token has been updated
    print("\nUpdated Dropbox Access Token")
    
    // Create a DropboxClient using the new access token and return it
    let dropboxToken = res["access_token"] as! String
    print(dropboxToken)
    return dropboxToken
}

struct DropboxManager {
    let dbxClient: DropboxClient
    let accessToken: String
    let chunkSize: UInt64
    
    init(refreshToken dbToken: String, appKeySecret dbKey: String) {
        chunkSize = (4 * (1024 * 1024))
        accessToken = createDropboxToken(refreshToken: dbToken, appKey: dbKey)
//        dbxClient = DropboxClient(accessToken: self.accessToken)
        dbxClient = DropboxClient(accessToken: self.accessToken)
        
    }
    
    func upload(file filePath: String, to dbxLocation: String) {
        let fileURL = URL(filePath: filePath)
        let fileName = fileURL.lastPathComponent
        let randomSize = 5 * 1024 * 1024
        if (FileManager.default.createFile(atPath: filePath, contents: Data(count: randomSize), attributes: nil)) {
            print("File created successfully.")
        } else {
            print("File not created.")
        }
        let fileSize = try? FileManager.default.attributesOfItem(atPath: filePath)[.size] as? uint64
//        Check to see if file is smaller than chunksize
//        FIXME: now getting this error ---- Only get this error if I add user to dropboxclient creation in init
//        [request-id 5e4b4893ca1b4ace944138a9a1f4f399] Bad Input: Error in call to API function "files/upload_session/start": Unexpected select user header. Your app does not have permission to use this feature
        if fileSize! < chunkSize {
            dbxClient.files.upload(path: "\(dbxLocation)/\(fileName)", input: fileURL).response(completionHandler: { response, error in
                if let response = response {
                    print("File uploaded: \(response)")
                } else {
                    print("Error upload session: \(error!)")
                }
            })
            .progress { progressData in print(progressData) }
            print("small file")
        } else {
//            start the upload session
            let session = dbxClient.files.uploadSessionStart(input: fileURL)
                .response(completionHandler: { response, error in
                    if let result = response {
                        print(result)
                        var offset: UInt64 = 0
//                        Append chunks to file
                        while (offset <= (fileSize! - self.chunkSize)) {
                            //FIXME: sessionDeinitialized
                            self.dbxClient.files.uploadSessionAppendV2(cursor: Files.UploadSessionCursor(sessionId: result.sessionId, offset: offset), input: fileURL)
                                .response {response , error in
                                    if let response = response {
                                        print("File appended: \(response)")
                                    } else {
                                        print("Error appending data to file upload session: \(error!)")
                                    }
                                }
                                .progress { progressData in print(progressData) }
                            offset += self.chunkSize
                        }
//                        Finish upload with last chunk
                        self.dbxClient.files.uploadSessionFinish(cursor: Files.UploadSessionCursor(sessionId: result.sessionId, offset: fileSize!), commit: Files.CommitInfo(path: "\(dbxLocation)/\(fileName)"), input: fileURL)
                            .response { response, error in
                                if let result = response {
                                    print(result)
                                } else {
                                    print(error!)
                                }
                            }
                            .progress { progressData in print(progressData) }
                    } else {
                        // the call failed
                        print(error!)
                    }
                })
        }
    }
}

 

1 Accepted Solution

Accepted Solutions

Michael-jamf
Helpful | Level 6
Go to solution

Okay managed to get it working with the examples that Dropbox has on their github. With no duplicate views. I think that was something on my end where the app wasnt actually closed or something.

This is for MacOS. If you want to use iOS I would recommend looking here. It worked out of the box for iOS.

ContentView.swift

 

import SwiftUI
import SwiftyDropbox
import AppKit

struct ContentView: View {

    func myButtonInControllerPressed() {
        // OAuth 2 code flow with PKCE that grants a short-lived token with scopes, and performs refreshes of the token automatically.
        let scopeRequest = ScopeRequest(scopeType: .user, scopes: ["account_info.read"], includeGrantedScopes: false)
        DropboxClientsManager.authorizeFromControllerV2(
            sharedApplication: NSApplication.shared,
            controller: nil,
            loadingStatusDelegate: nil,
            openURL: {(url: URL) -> Void in NSWorkspace.shared.open(url)},
            scopeRequest: scopeRequest
        )
    }
    
    var body: some View {
        VStack {
            Button {
                myButtonInControllerPressed()
            } label: {
                Text("Test Dropbox Auth")
            }
        }.frame(maxWidth: .infinity, maxHeight: .infinity)

    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

 

YOURAPPNAMEapp.swift

 

import SwiftUI
import SwiftyDropbox

@main
struct dropboxClientApp: App {
    
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        DropboxClientsManager.setupWithAppKeyDesktop("app-key")
        NSAppleEventManager.shared().setEventHandler(self,
                                                         andSelector: #selector(handleGetURLEvent),
                                                         forEventClass: AEEventClass(kInternetEventClass),
                                                         andEventID: AEEventID(kAEGetURL))
    }
    
    @objc
    func handleGetURLEvent(_ event: NSAppleEventDescriptor?, replyEvent: NSAppleEventDescriptor?) {
        if let aeEventDescriptor = event?.paramDescriptor(forKeyword: AEKeyword(keyDirectObject)) {
            if let urlStr = aeEventDescriptor.stringValue {
                let url = URL(string: urlStr)!
                let oauthCompletion: DropboxOAuthCompletion = {
                    if let authResult = $0 {
                        switch authResult {
                        case .success:
                            print("Success! User is logged into Dropbox.")
                        case .cancel:
                            print("Authorization flow was manually canceled by user!")
                        case .error(_, let description):
                            print("Error: \(String(describing: description))")
                        }
                    }
                }
                DropboxClientsManager.handleRedirectURL(url, completion: oauthCompletion)
                // this brings your application back the foreground on redirect
                NSApp.activate(ignoringOtherApps: true)
            }
        }
    }
}

 

 

View solution in original post

5 Replies 5

Greg-DB
Dropbox Staff
Go to solution

According to the Alamofire documentation, sessionDeinitialized means:

Session which issued the Request was deinitialized, most likely because its reference went out of scope.

There's also a description about it here:

Session was invalidated without error, so it was likely deinitialized unexpectedly. \
Be sure to retain a reference to your Session for the duration of your requests.

So, it sounds like your client object was released before the request could be completed; to fix that you'd need to update your code to keep your client object around while the request(s) complete. (Note that the requests are performed asynchronously.)

Michael-jamf
Helpful | Level 6
Go to solution

All the examples I have seen so far do not mention keeping a session alive.

An example from 2015.

The github docs to try out the api.

A github gist.

 

When I try to add `await` to the uploadstart all I get is "No 'async' operations occur within 'await' expression"  or when I add it inside for the appendV2 I get "Cannot pass function of type '(Files.UploadSessionStartResult?, CallError<Files.UploadSessionStartError>?) async -> Void' to parameter expecting synchronous function type"

 

Even tried the create folder and download

func createFolder(path: String) {
        dbxClient.files.createFolderV2(path: path).response { response, error in
            if let response = response {
                print(response)
            } else if let error = error {
                print(error)
            }
        }
    }
    
    func downloadFile(path: String) {
        dbxClient.files.download(path: path).response { response, error in
            if let response = response {
                print(response)
            } else if let error = error {
                print(error)
            }
        }
    }

What am I missing?

Greg-DB
Dropbox Staff
Go to solution

This isn't a matter of changing your code to use 'async'/'await' operations. This issue occurs when the client variable itself is deinitialized, which severs the network connection performing the API call.

 

In typical cases, the app would use the authorizeFromControllerV2 method and get the client from the authorizedClient singleton like in the readme, which would make this easier. I see you're not using that flow though; you can certainly create and manage your own client object as you do, but you'll need to make sure you keep a reference to it for the entire lifetime of the requests so that they can complete successfully.

Michael-jamf
Helpful | Level 6
Go to solution

Ah gotcha. I was reading the doc and it seemed like if I just used DropboxClient with a shortlived token, it would do that. I have since rewritten the code, different from how the docs have it since I was not having any luck getting that to work. Edited this code to be macOS.

Now to figure out why it creates a duplicate window. Think it has something to do with the NSView but not sure.

 

For anyone that comes  across this. Here is my code, it works but has that duplicate app window I mentioned earlier.

 

 

//ContentView.swift
import SwiftUI
import SwiftyDropbox
import AppKit

struct ContentView: View {
    
    @State var isShown = false
    
    var body: some View {
        HStack {
            VStack {
                    
                    Button(action: {
                        self.isShown.toggle()
                    }) {
                        Text("Login to Dropbox")
                            .padding(.top)
                    }

                    DropboxView(isShown: $isShown)
                    
                    Button {
                        if let client = DropboxClientsManager.authorizedClient {
                            print("successful login")
                        } else {
                            print("Error")
                        }
                    } label: {
                        Text("Test Login")
                            .padding(.bottom)
                            
                    }
                    
                }
                .onOpenURL { url in
                    let oauthCompletion: DropboxOAuthCompletion = {
                        if let authResult = $0 {
                            switch authResult {
                            case .success:
                                print("Success! User is logged into DropboxClientsManager.")
                                
                            case .cancel:
                                print("Authorization flow was manually canceled by user!")
                            case .error(_, let description):
                                print("Error: \(String(describing: description))")
                            }
                            NSApplication.shared.setActivationPolicy(.prohibited)
                        }
                    }
                    DropboxClientsManager.handleRedirectURL(url, completion: oauthCompletion)
            }
        }
    }
}

struct DropboxView: NSViewControllerRepresentable {
    
    typealias NSViewControllerType = NSViewController
    
    @Binding var isShown: Bool
    
    func updateNSViewController(_ nsViewController: NSViewController, context: Context) {
        if isShown {
            let scopeRequest = ScopeRequest(scopeType: .user, scopes: ["account_info.read", "files.metadata.write", "files.metadata.read", "files.content.write", "files.content.read"], includeGrantedScopes: false)
            
            DropboxClientsManager.authorizeFromControllerV2(
                sharedApplication: NSApplication.shared,
                controller: nsViewController,
                loadingStatusDelegate: nil,
                openURL: { (url: URL) -> Void in NSWorkspace.shared.open(url) },
                scopeRequest: scopeRequest)
        }
    }
    
    func makeNSViewController(context _: Self.Context) -> NSViewController {
        return NSViewController(nibName: "DBViewController", bundle: nil)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

 

 

 

 

 

//YOURApp.swift
import SwiftUI
import SwiftyDropbox

@main
struct dropboxClientApp: App {
    
    init() {
        DropboxClientsManager.setupWithAppKeyDesktop("app_key")
    }
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

 

 

Then you need to make a file type of View. I called mine "DBViewController" in the contentview file at the bottom. After that follow these instructions

  1. Make sure that you have a nib file named DBViewController.xib in your Xcode project.

  2. Open the nib file, select the File's Owner object, and set its class to NSViewController in the Identity Inspector.

  3. Connect the view outlet of the File's Owner to the view object in the nib file.

  4. In the makeNSViewController function of DropboxView, instantiate the DBViewController from the nib file using the init?(nibName:bundle:) initializer.

Michael-jamf
Helpful | Level 6
Go to solution

Okay managed to get it working with the examples that Dropbox has on their github. With no duplicate views. I think that was something on my end where the app wasnt actually closed or something.

This is for MacOS. If you want to use iOS I would recommend looking here. It worked out of the box for iOS.

ContentView.swift

 

import SwiftUI
import SwiftyDropbox
import AppKit

struct ContentView: View {

    func myButtonInControllerPressed() {
        // OAuth 2 code flow with PKCE that grants a short-lived token with scopes, and performs refreshes of the token automatically.
        let scopeRequest = ScopeRequest(scopeType: .user, scopes: ["account_info.read"], includeGrantedScopes: false)
        DropboxClientsManager.authorizeFromControllerV2(
            sharedApplication: NSApplication.shared,
            controller: nil,
            loadingStatusDelegate: nil,
            openURL: {(url: URL) -> Void in NSWorkspace.shared.open(url)},
            scopeRequest: scopeRequest
        )
    }
    
    var body: some View {
        VStack {
            Button {
                myButtonInControllerPressed()
            } label: {
                Text("Test Dropbox Auth")
            }
        }.frame(maxWidth: .infinity, maxHeight: .infinity)

    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

 

YOURAPPNAMEapp.swift

 

import SwiftUI
import SwiftyDropbox

@main
struct dropboxClientApp: App {
    
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        DropboxClientsManager.setupWithAppKeyDesktop("app-key")
        NSAppleEventManager.shared().setEventHandler(self,
                                                         andSelector: #selector(handleGetURLEvent),
                                                         forEventClass: AEEventClass(kInternetEventClass),
                                                         andEventID: AEEventID(kAEGetURL))
    }
    
    @objc
    func handleGetURLEvent(_ event: NSAppleEventDescriptor?, replyEvent: NSAppleEventDescriptor?) {
        if let aeEventDescriptor = event?.paramDescriptor(forKeyword: AEKeyword(keyDirectObject)) {
            if let urlStr = aeEventDescriptor.stringValue {
                let url = URL(string: urlStr)!
                let oauthCompletion: DropboxOAuthCompletion = {
                    if let authResult = $0 {
                        switch authResult {
                        case .success:
                            print("Success! User is logged into Dropbox.")
                        case .cancel:
                            print("Authorization flow was manually canceled by user!")
                        case .error(_, let description):
                            print("Error: \(String(describing: description))")
                        }
                    }
                }
                DropboxClientsManager.handleRedirectURL(url, completion: oauthCompletion)
                // this brings your application back the foreground on redirect
                NSApp.activate(ignoringOtherApps: true)
            }
        }
    }
}

 

 

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    Michael-jamf Helpful | Level 6
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