client.getAccountTransaction results in an error

[toshirot]

this code worked on 2019-09-01, but now I get an error.

code test-tx.js

  const libracore =require('libra-core')

  const client = new libracore.LibraClient({ network: libracore.LibraNetwork.Testnet });
  const accountAddress = '7f58df27522872ecfac340c5c072427e6f8083ca3c79bb748cdd1ae073dacc42';
  const sequenceNumber = 43; //can also use a string for really large sequence numbers;

  const transaction = client.getAccountTransaction(accountAddress, sequenceNumber); 

Run

node test-tx.js

Error

/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/libra-core/build/client/Decoder.js:39
        const signedTransaction = signedTransactionWP.getSignedTransaction();
                                                      ^

TypeError: Cannot read property 'getSignedTransaction' of undefined
    at ClientDecoder.decodeSignedTransactionWithProof (/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/libra-core/build/client/Decoder.js:39:55)
    at /home/tato/kabuda.net/html/test/libra/libra-core/node_modules/libra-core/build/client/index.js:109:38
    at Object.onReceiveStatus (/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/grpc/src/client_interceptors.js:1207:9)
    at InterceptingListener._callNext (/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/grpc/src/client_interceptors.js:568:42)
    at InterceptingListener.onReceiveStatus (/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/grpc/src/client_interceptors.js:618:8)
    at callback (/home/tato/kabuda.net/html/test/libra/libra-core/node_modules/grpc/src/client_interceptors.js:845:24)

[toshirot]

Maybe this testnet-update-september-4th effect? https://community.libra.org/t/testnet-update-september-4th/1630

• [crypto] Switches LedgerInfo to nextgen_crypto #373　https://github.com/libra/libra/pull/373 21
• [crypto] Changes types::SignedTransaction to use the nextgen crypto API #429　https://github.com/libra/libra/pull/429 17
• [crypto] apply nextgen_crypto x25519 across Libra #464　https://github.com/libra/libra/pull/464 13
• [storage][execution] Switch to Jellyfish Merkle Tree #516　https://github.com/libra/libra/pull/516 11
• [common] Add Canonical Serialization Spec #622　https://github.com/libra/libra/pull/622 9
• Use CanonicalSerialization of RawTransaction between client and validator #606　https://github.com/libra/libra/pull/606 17

[glachac]

The Libra testnet was reset. There are no old transactions. I took the address from your sample, and the current sequence number is zero.

This exception you are seeing is because the getSignedTransaction() method does not check if the returned GRPC call contains a valid signedTransactionWP, and it winds up getting a null-value. If it checked for null, it could return an error and not an exception.

You can see the lack of transactions on that address using LibExplorer: https://libexplorer.com/address/7f58df27522872ecfac340c5c072427e6f8083ca3c79bb748cdd1ae073dacc42

The testnet update does appear to break the current libra-core, and you can't perform any transactions at the moment.

[toshirot]

@glachac Thank you for your advice.

I watched LibExplorer. Certainly, there are no transactions. I tried to create a sequence by transferring after minting with another address for trial, but I couldn't. I can mint.

[glachac]

I have a PR with a fix for this now.