Support v2 transaction format

[OndrejHRIC]

Xcode 12.0 (12A7209)
iOS 14.0 / 13.7
Arweave 1.0.2

I'm not able to upload data over 10MB size. I was told that tx format v2 is able to handle data size over 10MB but there is no mention of it. How should I use v2? Thanks in advance.

[lukereichold]

Hi @OndrejHRIC, as of now, since this is an unofficial 3rd-party library, transaction v2 support has not yet been implemented. However, this would certainly be nice to have, and any community contributions are welcome!

[jsoneaday]

I've completed most of the code for v2, but having some issues testing. Can we get together and resolve then I'll make a pull request to your for the updates.

[jsoneaday]

I am able to post onto arlocal. But there's an issue when I get data back and try to decode it into the Transaction type. It seems like it should be an easy issue, but not seeing where the decode is failing.

[jsoneaday]

Almost there. So I'm able to post a transaction with string data. I'm then able to get back and decode the transaction without the data. Now when I try and get just the data the data does come back but when it decodes into string its empty.

            var transaction = Transaction(data: msgContent.data(using: .utf8)!)
            initTransaction(trans: &transaction, type: DeChatTypes.Message, userName: self.userName!)
            if let respondingToTransId = respondingToTransId {
                transaction.tags.append(Transaction.Tag(name: TagName.RespondingToTransId.rawValue, value: respondingToTransId))
            }
            
            let signedTx = try await transaction.sign(with: self.wallet!)
            let response = try await signedTx.commit()
                        
            let content = try await Transaction.find(signedTx.id)
            
            let data = try await Transaction.data(for: signedTx.id)
            let b = Data(base64Encoded: data)
            let message = String(data: b!, encoding: .utf8) // this is where it fails. data is gotten back but conversion to Data fails with nil
            
            return Result.success(signedTx.id)

[jsoneaday]

Ok I resolved the issues. Contact me if you want a pull

[lukereichold]

@jsoneaday Awesome work! I'd love to incorporate this feature. Can you submit a PR?

[lukereichold]

Referencing PR #7

Current status of this work on branch: https://github.com/lukereichold/arweave-swift/tree/add-formatv2

Remaining TODOs:

• TransactionTests.swift needs some unit tests added to ensure that both data and $ transfer transactions are working as intended
• Tag serialization for v2 in signatureBody() should match the logic used by the other libraries.

Once those get added then we can safely merge these changes.

[jsoneaday]

I've been testing on production, arweave.net and its failing. I did some fixes sign function but it looks like the signatureBody is now the issue. I suspect it is on the data_root field which is derived from the prepareChunks function but not sure exactly.

[jsoneaday]

Hey @OndrejHRIC I'm pretty close to done with the updates, but having one remaining issue with generating signatures. @lukereichold is busy.

Would you like to take a stab at it? I'm pretty sure this is the last issue and then I'll do a pull request to merge!