Memory leak executing UnsignedTransaction.to_json()

[ThierryM1212]

Trying to sign transactions in a loop, the UnsignedTransaction to_json method does not free the memory used.

Attaching a test case ran with nodejs.

mem-leak.txt

[ross-weir]

Not sure why you would want to do something like this but its likely caused by the infinite blocking loop, you can achieve a similar effect with no memory leak by doing:

setInterval(async () => {
    const unsignedTransaction = (await ergolib).UnsignedTransaction.from_json(JSON.stringify(tx));
    let txJSON = unsignedTransaction.to_json();
    unsignedTransaction.free();
}, 0)

[ThierryM1212]

Thanks for looing at the issue.

The initial code that was having memory leaks was for the CYTI miner and it is not used anymore:
ThierryM1212/cyti@0985b33#diff-ce78f2b518451890a837e00f6508b5533e07dcbdc52c97c4be28a9271bbdaac4R116
It is iterating with a nonce in a register to try to find the required sequence for the begining of the boxId.

To find it I've removed iteratively all the code until it stop to memleaks.
Running with --inspect option, an ArrayBuffer is always growing, it has references to wasm objects.

In other off-chain bots, for Blob's Topia, I'm also facing memory leaks after having taken care of freeing the resources.
The action are trigerred here by "setInterval".
https://github.com/ThierryM1212/blobs-topia/blob/main/blobs-bot/fight-bot.js

I will try to extract another minimal test case.

[ross-weir]

Ohh I see

I will try to extract another minimal test case.

Sounds good 👍