Getting OutOfGas Error when trying to call smart contract

Question

I am running tests of my !ink smart contracts using @727-ventures/typechain-polkadot module. But when I am running tests, sometimes getting OutOfGas Error. The strange thing is that not all cases are failing. I tried to put gasLimit manually but didn't work. Here is the code for calling smart contract.

const MAX_CALL_WEIGHT = new BN(5_000_000_000_000_000).isub(BN_ONE)
const PROOFSIZE = new BN(1_000_000_000)
const gasLimit = api?.registry.createType('WeightV2', {
  refTime: MAX_CALL_WEIGHT,
  proofSize: PROOFSIZE,
}) as WeightV2

const result = await contract.query.func(...args, { gasLimit })
const gasRequired = preview.gasRequired as WeightV2
const newGasLimit = api?.registry.createType('WeightV2', gasRequired) as WeightV2
const res = await contract.tx.func(...args, { gasLimit: newGasLimit })

This code is running well sometimes but getting error sometimes.

Answer 1

Looking at the code you provided, couple of things needs to be modified:

1. The line

const gasRequired = preview.gasRequired as WeightV2

should probably be

const gasRequired = result.gasRequired as WeightV2

But that can be destructured as well.

2. As per the docs, you should also include storageDeposit in the options

3. Options should be the first parameter passed to the .func method

Also, you don't need to create the type again, as result.gasRequired should be of the correct type already.

So, something like this should work:

const MAX_CALL_WEIGHT = new BN(5_000_000_000_000_000).isub(BN_ONE);
const PROOFSIZE = new BN(1_000_000_000);
const gasLimit = api?.registry.createType('WeightV2', {
  refTime: MAX_CALL_WEIGHT,
  proofSize: PROOFSIZE,
});
const storageDepositLimit = null;
const {storageDeposit, gasRequired} = await contract.query.func({ gasLimit, storageDepositLimit }, ...args);
const res = await contract.tx.func({ gasLimit: gasRequired, storageDepositLimit: storageDeposit }, ...args);