Compatibility with require()

[hilmarx]

Firstly thanks for putting the resources of live testing using estimateGas() together.

My question: Is there a way to retrieve the current blocks gasLimit in case of encountering a revert() in the gas estimation if the contract to be tested only uses revert() instead of assert()? I tried to make it work locally in truffle with web3 1.0, but this only seems to work when the deployed contract actually uses assert(), which is rarely the case these days due to the gas refund property of require(). Based on my current understanding one would have to redeploy the contracts to be tested and use assert() instead of require().

Thanks for your help!

[MoMannn]

When reverts happens you will get a: gas required exceeds allowance or always failing transaction error. At least from geth. If not and you can get gasLimit information from the latest block by calling: eth_getblockbyhash or eth_getblockbynumber.

[hilmarx]

Thanks. I haven't tried this directly with Geth, but it seems that the web3.js library with which I am currently trying this out won't return the gas required ... error, but only the consumed gas up until the revert() got triggered, hence not really being helpful in determining whether the tx will fail or not.

[hilmarx]

Solved, was only an issue with ganache, works with geth + web3.

[fulldecent]

Thanks for writing in, please share a link if you have any code samples or your own project.

[hilmarx]

@fulldecent will do