A tus client in pure dart. Resumable uploads using tus protocol Forked from tus_client

tus is a protocol based on HTTP for resumable file uploads. Resumable means that an upload can be interrupted at any moment and can be resumed without re-uploading the previous data again. An interruption may happen willingly, if the user wants to pause, or by accident in case of a network issue or server outage.

A tus client

Usage

import 'package:cross_file/cross_file.dart' show XFile;
// File to be uploaded
final file = XFile("/path/to/my/pic.jpg");
// Create a client
final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file,
    store: TusMemoryStore(),
);
// Starts the upload
await client.upload(
    onStart:(TusClient client, Duration? estimate){
        // If estimate is not null, it will provide the estimate time for completion
        // it will only be not null if measuring upload speed
        print('This is the client to be used $client and $estimate time');
    },
    onComplete: () {
        print("Complete!");
        // Prints the uploaded file URL
        print(client.uploadUrl.toString());
    },
    onProgress: (double progress, Duration estimate, TusClient client) {
        print("Progress: $progress, Estimated time: ${estimate.inSeconds}");
    },
    // Set this to true if you want to measure upload speed at the start of the upload
    measureUploadSpeed: true,
);

Using Persistent URL Store

This is only supported on Flutter Android, iOS, desktop and web. You need to add to your pubspec.yaml:

import 'package:path_provider/path_provider.dart';
//creates temporal directory to store the upload progress
final tempDir = await getTemporaryDirectory();
final tempDirectory = Directory('${tempDir.path}/${gameId}_uploads');
if (!tempDirectory.existsSync()) {
    tempDirectory.createSync(recursive: true);
}
// Create a client
final client = TusClient(
    Uri.parse("https://example.com/tus"),
    file,
    store: TusFileStore(tempDirectory),
);
// Start upload
// Don't forget to delete the tempDirectory
await client.upload();

Adding Extra Headers

final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file,
    headers: {"Authorization": "..."},
);

Adding extra data

final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file,
    metadata: {"for-gallery": "..."},
);

Changing chunk size

The file is uploaded in chunks. Default size is 512KB. This should be set considering speed of upload vs device memory constraints

final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file,
    maxChunkSize: 10 * 1024 * 1024,  // chunk is 10MB
);

Pausing upload

Pausing upload can be done after current uploading in chunk is completed.

final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file
);
// Pause after 5 seconds
Future.delayed(Duration(seconds: 5)).then((_) =>client.pause());
// Starts the upload
await client.upload(
    onComplete: () {
        print("Complete!");
    },
    onProgress: (double progress, Duration estimate, TusClient client) {
        print("Progress: $progress, Estimated time: ${estimate.inSeconds}");
    },
);

Set up the retry mechanism

It is posible to set up how many times the upload can fail before throw an error to increase robustness of the upload. Just indicate how many retries to set up the number of attempts before fail, the retryInterval (in seconds) to indicate the time between every retry and the retryScale (constant by default) to indicate how this time should increase or not between every retry.

final client = TusClient(
    Uri.parse("https://master.tus.io/files/"),
    file
    retries: 5,
    retryInterval: 2,
    retryScale: RetryScale.exponential,
);

Example

For an example of usage in a Flutter app (using file picker) see: /example