Problem parsing Stream log

Moralis General
#1

Hello,

I am with a problem. I am following this page with the tutorial to parse smart contract events that I receive in the webhooks. I am getting the following exception

MoralisError [Moralis Stream Error]: [S0001] Cannot decode the logs. No logs found in the webhook, or invalid webhook provided.
    at parseLog (/home/rute/Documents/projects/parse-server-migration/node_modules/@moralisweb3/streams/lib/methods/logParser.js:13:15)
    at MoralisStreams._this.parsedLogs (/home/rute/Documents/projects/parse-server-migration/node_modules/@moralisweb3/streams/lib/MoralisStreams.js:56:81)
    at /home/rute/Documents/projects/parse-server-migration/build/index.js:36:71
    at Layer.handle [as handle_request] (/home/rute/Documents/projects/parse-server-migration/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/rute/Documents/projects/parse-server-migration/node_modules/express/lib/router/index.js:328:13)
    at /home/rute/Documents/projects/parse-server-migration/node_modules/express/lib/router/index.js:286:9
    at Function.process_params (/home/rute/Documents/projects/parse-server-migration/node_modules/express/lib/router/index.js:346:12)
    at next (/home/rute/Documents/projects/parse-server-migration/node_modules/express/lib/router/index.js:280:10)
    at cors (/home/rute/Documents/projects/parse-server-migration/node_modules/cors/lib/index.js:188:7)
    at /home/rute/Documents/projects/parse-server-migration/node_modules/cors/lib/index.js:224:17 {
  isMoralisError: true,
  code: 'S0001',
  details: undefined
}

My code looks like this:

export default interface MarketplaceItem {
  id:BigNumber;
  tokenId:BigNumber;
  tokenAddress:string;
  askingPrice:BigNumber;
  sellerAddress:string;
}

const webhookData: any = req.body;
console.log(webhookData);
const marketplaceItem: MarketplaceItem[] = Moralis.Streams.parsedLogs<MarketplaceItem>(webhookData);

and the solidity event looks like this:

    event itemAdded(uint256 id, uint256 tokenId, address tokenAddress, uint256 askingPrice, address sellerAddress);

And the object looks like this:

{"confirmed":true,"chainId":"0x13881","abi":[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"address","name":"tokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"askingPrice","type":"uint256"},{"indexed":false,"internalType":"address","name":"sellerAddress","type":"address"}],"name":"itemAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"}],"name":"itemRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"askingPrice","type":"uint256"}],"name":"itemSold","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"askingPrice","type":"uint256"}],"name":"updatedAskingPrice","type":"event"}],"streamId":"84a07e19-e2f0-4be8-a549-d2ea06447215","tag":"NewItemMarketplace","retries":0,"block":{"number":"30429799","hash":"0x0243585c2f4e846f54445ea56470e9755f9d64cdd83893bfff3bb93f7f5a7dc7","timestamp":"1672610364"},"logs":[{"logIndex":"16","transactionHash":"0xee4c241e5c61aedc10e8d9812e3fdcde0720f3536b553cf192e4d5ea4fdf68ab","address":"0xcd116c9c037f0c3e270fe2d7eff0c7549a45aa91","data":"0x000000000000000000000000000000000000000000000000000000000000000d00000000000000000000000000000000000000000000000000000000000000150000000000000000000000009f8ab1677e8461e0b91b653a37bea3bc8933f614000000000000000000000000000000000000000000000000000009184e72a000000000000000000000000000229b4dbbac15f306651c55aa61305612a4fc789b","topic0":"0x42982e457d0a397b075db754e4e099e3a77a371779574db03bc33b78173c7ff4","topic1":null,"topic2":null,"topic3":null}],"txs":[],"txsInternal":[],"erc20Transfers":[],"erc20Approvals":[],"nftTokenApprovals":[],"nftApprovals":{"ERC721":[],"ERC1155":[]},"nftTransfers":[],"nativeBalances":[]}

What can be the problem?

Thanks and Happy New Year,
Pedro

#2

Hi @pedrosantos

I am able to decode the logs from the stream object which you shared using Moralis.Streams.parsedLogs, so it is not an error in the received data.

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image1096×266 32.6 KB

That error usually happens only if the logs array in the stream object is empty or not acessable. So you can add an if condition to check if the logs are available and only then you can proceed with decoding the logs.
And make sure the webhookData is in a json format not the string.