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I wonder is there some possibility to listen MakerDAO's LogNote events, like we able to do with standard events.

What I managed to research:

I saw that LogNote was listed as an event from contract details

let contractIntanse = await new web3.eth.Contract(abi, contractAddress); console.log("contractIntanse.events: ", contractIntanse.events) contractIntanse.events: { Approval: [Function: bound ], '0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925': [Function: bound ], 'Approval(address,address,uint256)': [Function: bound ], LogNote: [Function: bound ], '0xd3d8bec38a91a5f4411247483bc030a174e77cda9c0351924c759f41453aa5e8': [Function: bound ], 'LogNote(bytes4,address,bytes32,bytes32,bytes)': [Function: bound ], Transfer: [Function: bound ], '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef': [Function: bound ], 'Transfer(address,address,uint256)': [Function: bound ], allEvents: [Function: bound ] }

However, I was not able to check this properly, e.g:

1. event.watch does not work for me because of web3 v1

2. I tried using WebsocketProvider

web3.eth.subscribe("logs", { address: "0x23..." }, function(error, result) { console.log("subscribe result:",result); console.log("subscribe error:",error); }) .on("connected", function(subscriptionId) { console.log("subscriptionId:" + subscriptionId); }) .on("data", function(log) { console.log("data:" + log); }) .on("changed", function(log) { console.log("changed:" + log); });

However, I was not able to see smth when I trigger event

await contractIntanse.methods.rely(address1);

Here is related issue I managed to find https://github.com/ethereum/web3.js/issues/1752

3. I also tried to use getPastEvents, as latest issues/1752 suggested

const eventOptions = { filter: {}, fromBlock: 0, toBlock: 'latest' }; const events = await contractIntanse.getPastEvents('LogNote', eventOptions);

It works ok for standartd event. However, for LogNote I get an error:

Error: overflow (operation="setValue", fault="overflow", details="Number can only safely store up to 53 bits")

Eventually, I'm very confused, do we able to listen MakerDAO's LogNote? Appreciate any help, link to docs, discussions etc. Thanks!

ADDITIONAL:

I'm using DAI contract https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#contracts

Here is a commit was used for deployments on mainnet. I used as a base. https://github.com/makerdao/dss/blob/6fa55812a5fcfcfa325ad4d9a4d0ca4033c38cab/src/dai.sol

The LogNote takes from LibNote. It what I'm trying to listen. https://github.com/makerdao/dss/blob/6fa55812a5fcfcfa325ad4d9a4d0ca4033c38cab/src/lib.sol

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Because LogNote is an anonymous event it is cheaper but on the other side you cannot filter it using a topic. See this already answered question for more details.

Anyway, you can listen to all contract events and then filter in Javascript. DAI in fact has only 3 types of event: Transfer and Approval - with 3 parameters - and LogNote - with 4 parameters. LogNote is fired only by rely and deny functions, so you can use the code below to listen those events:

const Web3 = require("web3"); const web3 = new Web3("ws://localhost:8546"); web3.eth.subscribe("logs", { address: "0x731830527c286469E89b5e43030C1fA3D9d78f03" }, function (error, result) { if (error) { console.error("subscribe error:", error); return; } if (result.topics.length == 4) { // This is a `rely` or `deny` event let signature = result.topics[0]; let sender = result.topics[1]; let arg1 = result.topics[2]; let arg2 = result.topics[3]; //this is always 0x0 } }) .on("connected", function (subscriptionId) { console.log("subscriptionId:" + subscriptionId); });

Please note you cannot distinguish from rely or deny only looking at the log, but you must check the original transaction payload.

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