Having trouble getting a list of events for a contract with v6. Worked in v5.

[ptoner]

Hi,

In v5 I had some code that roughly looks like this that was grabbing all of the events by a particular contract. Now I'm working to upgrade to v6 and I'm not sure how to change this. The first problem I'm having is getting a list of the filters from the contract. This was getting the keys from the filters object and then grabbing the appropriate topics and adding them all to an array.

Now I can't seem to get anything out of contract.filters, but it's not clear why. It prints out an empty object and getting an event by name throws an error saying it can't be found. I suspect something in the underlying data structure might have changed where Object.keys no longer works? Is there a better way to do this? This was working relatively well.

Thank you for any ideas or help you might have.

On version 6.6.5.

let contract = new ethers.Contract(...)

//Grab the filters that have () in them. Because the list is duplicated. 
let eventKeys = Object.keys(contract.filters).filter(v => v.includes("("))

let topics = []

for (let eventKey of eventKeys) {
    topics.concat(eventKey.topics)
}



//Get events
let events = await contract.queryFilter({
    address: contractAddress,
    topics: topics
},
    startBlock,
    endBlock
)

[ptoner]

I also switched from the StaticJsonRpcProvider to AlchemyProvider because it seemed like it had been removed? I don't think that would have anything to do with the contract.filter part of the problem though.

EDIT: Well ok I discovered that if I contract.queryFilter("*") it gives me the logs that I want. So maybe I can just skip that whole step where I manually put together the list of topics.

[ptoner]

Ok I guess I'm just going to mark this answered. This seems to fix the issue. I found this info on a comment on an issue but I lost the link. Thank you!

[ricmoo]

In v6, .filters is a proxy, so that it can respond to non-normalized forms; for example contract.filters["Transfer(address indexed from, address indexed to, uint amount"] and contract.filters["Transfer(address indexed _from, address indexed, uint"] will both access the correct entry (in the second entry the name from is _from instead and the names of the other parameters were omitted). So it’s much more powerful to find the correct event.

To deal with the contract interface, which is your interest, you can can use the interface directly: const topics = contract.interface.events.map(e => e.topicHash); no need to construct it manually. You can still use your original code, just change Object.keys(contract.filters) to contract.interface.events.

Hope that helps and explains a bit about the difference. :)

[ptoner]

Ok good to know. I'll play around with it and hopefully get through some other similar conversion issues. Thank you for the help.

[ricmoo]

If you have any questions, also feel free to reach out on Discord. I usually reply right away, assuming I'm not asleep...

[WarrenPanDDDD]

hi ricmoo, contract.interface.events is having an error saying events is not in Interface type. ethers v 6.13