Using try await with upload requests

Question

I am using the following code for multipart data upload

let postValue = try await AF.upload(multipartFormData: { multipartFormData in
        multipartFormData.append("123".data(using: .utf8, allowLossyConversion: false)!, withName: "number1")
        multipartFormData.append("456".data(using: .utf8, allowLossyConversion: false)!, withName: "number2")
        multipartFormData.append("SomeLocation".data(using: .utf8, allowLossyConversion: false)!, withName: "location")
    }, to: "http://httpbin.org/post").uploadProgress { progress in
        debugPrint(progress)
    }.serializingDecodable(PostResponse.self).value

the uploadProgress is used as a closure in this case which is kind of against the try await. Is there a better way for using it?

score 3 · Accepted Answer · answered Jan 03 '22 at 20:44

3

There is an awaitable StreamOf<Progress> you can use, but you'll need to handle the async stream separately, so it's often most convenient to keep using the closure API.

let request = AF.upload(...)
Task {
  for await progress in request.uploadProgress() {
    debugPrint(progress)
  }
}
let value = try await request.serializingDecodable(PostResponse.self).value

answered Jan 03 '22 at 20:44

Jon Shier

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Why is `StreamOf` under a separate `Task`? – hariszaman Jan 04 '22 at 14:01
2

If it wasn't, you'd be stuck on the `for await` until the stream was complete, so the separate `Task` ensures it doesn't block the main stream of execution. – Jon Shier Jan 04 '22 at 16:01

Using try await with upload requests

1 Answers1