getPastEvents , event is undefined

Questions
1

I have migrated a contract using truffle to Rinkeby through Infura, it went up successfully, and I can interact with it in our dApp using Web3js v0.20.7, specifically the Events.

I would also like to query events using node on a scheduler, so I have this using web3 v1.2.2

const Web3 = require(“web3”);
var cryptozArtifact = require(’./Cryptoz.json’)
const rinkebyCryptoz = “0x822ee9b5d26a45a37885dd2b5a56c45b710c9548”;

let web3 = new Web3(
// Replace YOUR-PROJECT-ID with a Project ID from your Infura Dashboard
new Web3.providers.WebsocketProvider(“wss://rinkeby.infura.io/ws/v3/MY_PROJECT_ID”)
);

const instance = new web3.eth.Contract([cryptozArtifact], rinkebyCryptoz);

instance.getPastEvents(
“AllEvents”,
{ fromBlock: 0, toBlock: “latest” },
(errors, events) => {
if (!errors) {
// process events
console.log(events);
//console.log(JSON.stringify(events, null, 4));
}
}
);

The event logs look like this

{
address: ‘0x822eE9b5D26a45a37885dd2B5A56C45b710C9548’,
blockHash: ‘0x575e4ab2e174e2a1ea24fea3a434c083ec9aa53b3154f5c1fb5344faf4d6fe51’,
blockNumber: 7319169,
logIndex: 2,
removed: false,
transactionHash: ‘0xf4c9b02e451c0e63c1bf66a19869c938f6419e9c37aec01537c3ebce247337b5’,
transactionIndex: 2,
id: ‘log_e00cafdb’,
returnValues: Result {},
event: undefined,
signature: null,
raw: {
data: ‘0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000b42726f776e204c656d7572000000000000000000000000000000000000000000’,
topics: [Array]
}
},

and I can’t filter by events I have emitted like LogCardCreated

Error: Event “LogCardCreated” doesn’t exist in this contract.

Any ideas ? thanks !

1 Like
2

Thanks @Eth_4Life for joining the community. Can you provide the full error response you’re getting when trying to access the logs on mainnet?

3

Hi Mike, thank you.
These contracts are not deployed on Mainnet, as they are still being developed on Rinkeby. Should we deploy on an alternative Ethereum Test network ?

4

Sorry about that should have deducted that from your URL, I don’t believe rinkeby would be the issue here, but if you have the full error response that would help us diagnose the issue.

5

no worries,

so when I console.log(errors), it is null. and the events contains over 167 objects, similar to what I have pasted above. Here are 2 more random ones.

You can access the JSON interface file here : https://github.com/ryanprice/Cryptoz.cards-Dapp/blob/master/src/contracts/Cryptoz.json

{
address: ‘0x822eE9b5D26a45a37885dd2B5A56C45b710C9548’,
blockHash: ‘0x995711f1671278d7fa0e177dc38469ac479f8c9bb3c3acfa5c3fd1e5f9c93561’,
blockNumber: 7319146,
logIndex: 5,
removed: false,
transactionHash: ‘0x3ced58b98ac9dccbbfafb2a597bd03f6716587016f6d22b5dd66425ca165925c’,
transactionIndex: 5,
id: ‘log_299ccb9a’,
returnValues: Result {},
event: undefined,
signature: null,
raw: {
data: ‘0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000454696e7900000000000000000000000000000000000000000000000000000000’,
topics: [Array]
}
},
{
address: ‘0x822eE9b5D26a45a37885dd2B5A56C45b710C9548’,
blockHash: ‘0x995711f1671278d7fa0e177dc38469ac479f8c9bb3c3acfa5c3fd1e5f9c93561’,
blockNumber: 7319146,
logIndex: 6,
removed: false,
transactionHash: ‘0x59549aae11a98cbbe5517cb34a9b256f03d0d6ab9cad52f0f6abc7a457a127a4’,
transactionIndex: 6,
id: ‘log_59a41230’,
returnValues: Result {},
event: undefined,
signature: null,
raw: {
data: ‘0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000015426c6f6f647920486f72726f727320436173746c650000000000000000000000’,
topics: [Array]
}
},

6

maybe this will help too

/home/rprice/Downloads/cryptoz-cards-server/node_modules/web3-eth-contract/src/index.js:546
throw new Error(‘Event "’ + eventName + ‘" doesn’t exist in this contract.’);
^

Error: Event “LogCardCreated” doesn’t exist in this contract.
at Contract._generateEventOptions (/home/rprice/Downloads/cryptoz-cards-server/node_modules/web3-eth-contract/src/index.js:546:15)
at Contract.getPastEvents (/home/rprice/Downloads/cryptoz-cards-server/node_modules/web3-eth-contract/src/index.js:661:49)
at Object. (/home/rprice/Downloads/cryptoz-cards-server/getEvents.js:20:10)
at Module._compile (internal/modules/cjs/loader.js:959:30)
at Object.Module._extensions…js (internal/modules/cjs/loader.js:995:10)
at Module.load (internal/modules/cjs/loader.js:815:32)
at Function.Module._load (internal/modules/cjs/loader.js:727:14)
at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10)
at internal/main/run_main_module.js:17:11

7

@Eth_4Life,

This seems to be an issue with web3.js, the data returns correctly when I query for it directly:

$ wscat -c wss://rinkeby.infura.io/ws/v3/MY-PROJECT-ID
connected (press CTRL+C to quit)
> {"jsonrpc":"2.0", "id": 1123123, "method": "eth_getLogs", "params": [{"address": "0x822eE9b5D26a45a37885dd2B5A56C45b710C9548", "topics":["0xd56e3675590b3a0ffa7898c8a21c1dc687046d1a54c8d9d28c3e429e51f5670c"], "fromBlock":"0x0", "toBlock":"latest"}]}

I get back the results included at https://gist.github.com/ryanschneider/4d370396eeba2edcb2422c715ede7b10

I’m not terribly familiar w/ web3.js but it sounds like it didn’t properly parse your ABI file, I would suggest checking for similar issues on their github: https://github.com/ethereum/web3.js/issues?q=is%3Aissue+is%3Aopen+getPastEvents

8

Awesome, ok this will help, at least with my sanity :slight_smile: I will go try out some stuff and maybe some other versions of web3j too. I’ll come back and post here when I find a solution. Really appreciate the replies and support here guys.

9

Just to follow up in case this helps someone else. I could not figure out how to get the data I wanted in web3js, so I switched to https://docs.ethers.io/v5/ and everything is working great. Thanks everyone for the feedback, consider this resolved.

1 Like