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In web3.js, if a revert occurs, it doesn't give a receipt along with it. I want to determine how much gas was actually used after a revert.

In 1.0, I can't even get the tx hash from the event transmitter.

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  • I have a custom geth which gives you the real gas estimation on any transaction, erroneous or not, with gas refunds or without, contact me and I will send you the code – Nulik Sep 19 '18 at 0:46
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EDIT: The below only works for ganache.

In my testing, the below works. The function storeAndRevert, as you might imagine, stores the argument in a state variable and then reverts:

instance.methods.storeAndRevert(42).send({ from: accounts[0], gas: 3000000 })
.on('error', async (err) => {
  const receipt = await web3.eth.getTransactionReceipt(err.hashes[0]);
  console.log(`Gas used: ${receipt.gasUsed}`);
});

As far as I know, the error event is the only one you'll be able to listen for, though I think try/catch will give you access to the same error object.

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  • This doesn't work for me. I'm using web3 1.0.0-beta.36. I tested your exact code on a function which reverts. The err parameter is a string for me, not an object. – JBrouwer Oct 15 '18 at 12:48
  • Yes, this send to only work with ganache. I'll edit the answer. – user19510 Oct 15 '18 at 13:52
  • I am using this on ganache actually... I am assuming that instance is a web3.eth.Contract instance? – JBrouwer Oct 15 '18 at 14:15
  • Yes. This may vary depending on the ganache version? I was using ganache-core at version 2.2.1. – user19510 Oct 15 '18 at 14:21
  • I am testing this on the latest ganache-cli and ganache-core (2.2.1) versions. – JBrouwer Oct 15 '18 at 15:17

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