Feature: add base fee to the Block object (EIP-1559)

[azf20]

The London hardfork introduces a change to fee markets on Ethereum (EIP-1559). This introduces a new "base fee per gas" per block, which is not currently available. Can we add this to the Block object so it is available to developers in mappings?

Discord request

[dmihal]

I created a really simple PR to add baseFee to the Block class here graphprotocol/graph-ts#197

I'm now looking into how this can be populated by the node

[leoyvens]

We would also need to deal with the outdated data in the block cache for existing DBs. Maybe by having a migration that clears the block cache.

[dmihal]

Created a PR (tomusdrw/rust-web3#531) to add the base fee to rust-web3, which I imagine is an upstream prerequisite for this feature

[azf20]

This is available in graph-node:v0.25.0 (PR), graph-ts:v0.24.1 and graph-cli:v0.25.0. Thanks for opening @dmihal!