api: estimate gas logging

[tynes]

Description
This PR will add the gas used into the logline for eth_estimateGas so that we can see how much gas transactions are using

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Latest commit: 2f6b0ec

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[gakonst]

@tynes what's the status of this? Is this a feature we want on master? Can imagine it'd generate a lot of redundant logs.

[tynes]

Lets tag this as "Do not merge", this branch is useful for debugging the problems we have been seeing recently when gasPrice is not set to 0.

We have determined that 2 instances of the eth_estimateGas bug were due to user failure, in particular not setting the from. We haven't confirmed that it is a user problem on the side of the Synthetix oracle, and we still see the logline gas required exceeds allowance (%d) or always failing transaction in the production logs.

We forked geth before the revert messages would be passed back through the RPC, see ethereum/go-ethereum#21083

Can imagine it'd generate a lot of redundant logs.

This adds no additional loglines, just adds a single additional value to a logline that already exists

Happy to close when we confirm with Synthetix that the bug is a user error

[tynes]

@K-Ho I have rebased and added an additional commit on top of this PR. It does 2 things:

• logs the estimated gas amount which will differentiate always failing txs from txs that are actually out of gas 27ccb56
• logs the internal variables of the estimate gas equation and add error wrappers to know exactly where the error is happening 9c42428

[tynes]

The transaction fees on L2 are currently overpriced on Kovan and underpriced on Mainnet. @K-Ho can you provide an update? #515

Maybe we do want the commits that add the updated logs? 2f6b0ec is now part of #519, so that will be removed from this branch when it gets rebased again

This branch is continued to be used for debugging

[tynes]

Going to close this because it hasn't been used in awhile