antoncoding / crypto-hex-decoder Goto Github PK

This is more of a question than a bug report. I am investigating the proper way to find out that a transaction is either Transfer, PlaceOrder or CancelOrder. For example the response for block number 1675624 looks like so:

  "data": {
    "txs": [
      "0QHwYl3uClcWbmgbChQuWkaHZ7auJklLB/2D3jU9pDqcGBIMTUlUSC1DNzZfQk5CGi0yRTVBNDY4NzY3QjZBRTI2NDk0QjA3RkQ4M0RFMzUzREE0M0E5QzE4LTEzOTMScAom61rphyEDOF/+FGN7KGHRLSAjgklqmU2HytDmBpVzSQel4mPXhK0SQJ1VWVNwyZcVP4jdU5BkmasjCvj9XXh+kVav22mbzgkIRYxRnzUQFeFr+f5g3PrJp5Muhv+m5Pf8rl8g7Bcean0Y8gUg/QogAw==",
      "4gHwYl3uCmjObcBDChQ5gxX3iAGQO700xCvwmaTWpeXTlxItMzk4MzE1Rjc4ODAxOTAzQkJEMzRDNDJCRjA5OUE0RDZBNUU1RDM5Ny0xMTI1GgxNSVRILUM3Nl9CTkIgAigBMISRDjiA0I3AkhhAARJwCibrWumHIQMsx1J1eWZeFQP1hDa5pZlEFbtWX3ZxVnAPFLQJ8TPbshJA58WuHDJfFc1Km5dxUIkT97lvByNfYyEqxTzr34BfS2IGbDl4/esmVpNUwTcCew+naYpN+uPazjFyaXjY4HpMYhjzBSDkCCAD",
      "4gHwYl3uCmjObcBDChTkgZtIllLDN+FImM1f4L0nY3PhJRItRTQ4MTlCNDg5NjUyQzMzN0UxNDg5OENENUZFMEJEMjc2MzczRTEyNS0xNjE3GgxNSVRILUM3Nl9CTkIgAigBMJnQDjiApOiujxJAARJwCibrWumHIQMuE8JaXBNga6hZX+nAihtky08q1hO5WZohXAdgwsUbGBJAi+fInpJE4dv6xR8pPnUMokRG2vgKXHDptW4Lw0pT3ApDEqKAUg6IcX5d2J12KMFCpeZdWRnBAeG0IdeHZ4LHhhj0BSDQDCAD"
    ]

Trying to decode the first of those transactions as all of the possible types returns meaningful result. The results are like so:

Transfer is { inputs: [ { address: , coins: [Array] } ],
outputs: [ { address: , coins: [Array] } ],
msgType: 'MsgSend' }
Place order is: { sender: <Buffer 2e 5a 46 87 67 b6 ae 26 49 4b 07 fd 83 de 35 3d a4 3a 9c 18>,
id: 'MITH-C76_BNB',
symbol: '2E5A468767B6AE26494B07FD83DE353DA43A9C18-1393',
ordertype: 112,
side: 38,
price: 0,
quantity: 0,
timeinforce: 0,
msgType: 'NewOrderMsg' }
Cancel order is: { sender: <Buffer 2e 5a 46 87 67 b6 ae 26 49 4b 07 fd 83 de 35 3d a4 3a 9c 18>,
symbol: 'MITH-C76_BNB',
refid: '2E5A468767B6AE26494B07FD83DE353DA43A9C18-1393',
msgType: 'CancelOrderMsg' }
{}

As there is nothing in the response specifying the type, what would be the proper way to find it out.

Thanks!

Hi @antoncoding
I am facing an issue with decodeTransfer() function in which the data hex of a transaction with multiple outputs doesn't return all the outputs but just the first one, I am trying to view both the outputs of this transaction (https://testnet-explorer.binance.org/tx/E78C83F2FC9089486ECD55F9DE48E9DAB164A9004C2302754D63465AC8601D44). I tried going through the code too, but couldn't find a solution.
Could you please help me with this?
You can get data hex of the transaction I am trying to get the data of by visiting this url:
https://testnet-dex.binance.org/api/v1/tx/E78C83F2FC9089486ECD55F9DE48E9DAB164A9004C2302754D63465AC8601D44

{"msg":[{"inputs":[{"address":"tbnb138u9djee6fwphhd2a3628q2h0j5w97yx48zqex","coins":[{"denom":"BNB","amount":40000000000}]}],"outputs":[{"address":"tbnb18u4mzgv403uxvh5249wlzxueejah8eagp7j7hs","coins":[{"den om":"BNB","amount":20000000000}]}],"msgType":"MsgSend"}],"signatures":[{"pub_key":{"type":"Buffer","data":[193,35,154,82,160,189,207,229,205,111,52,202,98,183,255,129,131,245,66,69]},"signature":{"type":"Buf fer","data":[10,3,66,78,66,16,128,144,223,192,74]},"account_number":112,"sequence":38}],"memo":"","source":0,"data":"","msgType":"StdTx"}

Here is my transaction detail in the mainnet:

https://dex.binance.org/api/v1/tx/16908395AE595CB6D3E33F857A7E1934F3A0BD7F920F73AE90232DB5A959AB0C?format=json

As you can see, the memo is:

"data": null,
"memo": "AVA_D_021189",

But, when I tried to decode raw tx above, it is:

3gHwYl3uClgqLIf6CigKFMm3DGlwDnrl8oUv/XuUcGS9pSBjEhAKB0FWQS02NDUQgICz/8QDEigKFEVc1zZPMVGEI/wwNXGZG6jdXLDSEhAKB0FWQS02NDUQgICz/8QDEm4KJuta6YchA5DMmRpyXoWfDeEKwECe+PVqqKEJHWQmGMhNou4rSireEkBccrwLsoJk8uNcl7GTVGhdwGdeyjugUfLnU1UeWoKJYT8D3LDWt2N6BU7yKadlWvJ/Lsh44xMJl3oXWS9m1LzXGJecFBoMQVZBX0RfMDIxMTg5IAI=

And here is the response after decode:

  memo: '',
  source: 0,
  data: '',
  msgType: 'StdTx' }

@antoncoding do you have any information about it?

Here is my source code:

    const bytes = Buffer.from(rawData, 'base64');
    // currently only supported transfer type
    try {
      const tx = bnbDecoder.decode(bytes.toString('hex'), config.network === 'testnet');
      console.log(`tx=========`, tx);
      return tx;
    } catch (err) {
      // if error, it mean it maybe not transfer tx
      return null;
    }

Could you please support testnet?

I have tried to decode the transactions in the first two blocks on the BNB chain. The first non empty block is 52353 which decodes correctly. The second non empty block is 56507, which also contains one Transfer transaction, it fails to decode with error:

throw new Error(encountered fieldNum: ${fieldNum}, but we have already seen fnum: ${lastFieldNum})

I acquire both transaction hashes using an RPC request like so:

curl https://seed1.4leapbnb.com:443 -d @requestBlock.json

The RPC request looks like so:

cat requestBlock.json 
{"method": "block",
 "jsonrpc": "2.0",
 "params": [
	 "52353"
 ],
 "id": "dontcare"
}

I am then interested in this part of the response:

"data": {
        "txs": [
          "xAHwYl3uCk4qLIf6CiMKFOfWS4XKCqy2D0eDhU1Tz/okobYdEgsKA0JOQhCAyK+gJRIjChRWk4qgkH+l8sPIB9DBOkQit9FZWxILCgNCTkIQgMivoCUSbAom61rphyECPYFbIkkUUiC/tnsPu9KwAf/8PpcwSTCAE/FWqsJCQJASQJIUtRhIFVlytl+Ob5sobS7sERp7+7EmDrupYRS7N1KfOhUxoRFJCja7kbXXR9CPx5aSUJk3dCIh2Q+A7Cwf5lAYFiAB"
        ]
      }

The JS code used to do the decoding looks like this:

const txHexDecoder = require("raw-transaction-hex-decoder");


// Tx data returned for block 52353. Decodes correctly
const bufferDecoded = Buffer.from('xAHwYl3uCk4qLIf6CiMKFOfWS4XKCqy2D0eDhU1Tz/okobYdEgsKA0JOQhCAyK+gJRIjChRWk4qgkH+l8sPIB9DBOkQit9FZWxILCgNCTkIQgMivoCUSbAom61rphyECPYFbIkkUUiC/tnsPu9KwAf/8PpcwSTCAE/FWqsJCQJASQJIUtRhIFVlytl+Ob5sobS7sERp7+7EmDrupYRS7N1KfOhUxoRFJCja7kbXXR9CPx5aSUJk3dCIh2Q+A7Cwf5lAYFiAB', 'base64')

// Tx data returned for block 56507. Does NOT decode correctly instead
// raw-trx-hex-decoder/node_modules/raw-transaction-hex-decoder/src/utils/amino.js:115
// throw new Error(`encountered fieldNum: ${fieldNum}, but we have already seen fnum: ${lastFieldNum}`)
//const bufferDecoded = Buffer.from('yAHwYl3uCkwqLIf6CiIKFFaTiqCQf6Xyw8gH0ME6RCK30VlbEgoKA0JOQhCAwtcvEiIKFCMJWejjsvQCM4kYGRbXUJt/L6e9EgoKA0JOQhCAwtcvEmwKJuta6YchAztOCdLc4TZvGVFzR8Di8uWQc+wrWCiNMteTI+WOrxHZEkALKLqUsUE1yfgXLVMUqCfinHXlOp2TF3XuoQhPEVrU6SkjlmIB+IBhhJWJ4S8jEDx3ITNF9/4L9STfK3EDvhh/GBgaBHRlc3QgAQ==', 'base64')

let decodedTx = txHexDecoder.decodeBnbRawTx(bufferDecoded.toString('hex'), 'Transfer');
console.log(JSON.stringify(decodedTx));

Hi there! This looks interesting. If I may ask, what do you use this for? Thank you!