Integrate Permits in EthAPI

[mattsse]

Describe the feature

with ethProof the EthApi now has an expensive endpoint that should be ratelimited.

the tracing endpoints, like debug already have a shared BlockingTaskGuard:

https://github.com/paradigmxyz/reth/blob/edbbc9636eca770102f6ff33779130deb7b38360/crates/rpc/rpc/src/debug.rs#L1024-L1030

However, these are aimed at the CPU, while eth_proof focuses more on the memory. we can solve this with an additional guard in ethAPI itself. we want to explicitly restrict eth_getproof without interfering too much with the regular tracing calls.

TODO

• integrate guard for ethProof in ethAPI

This needs 1) a new setting proof_permits: usize in the new function: https://github.com/paradigmxyz/reth/blob/edbbc9636eca770102f6ff33779130deb7b38360/crates/rpc/rpc/src/eth/core.rs#L40-L47 2) add a guard instance: https://github.com/paradigmxyz/reth/blob/edbbc9636eca770102f6ff33779130deb7b38360/crates/rpc/rpc/src/eth/core.rs#L156-L156 3) expose acquire functions in https://github.com/paradigmxyz/reth/blob/edbbc9636eca770102f6ff33779130deb7b38360/crates/rpc/rpc-eth-api/src/helpers/blocking_task.rs#L10-L10 similar to https://github.com/paradigmxyz/reth/blob/edbbc9636eca770102f6ff33779130deb7b38360/crates/tasks/src/pool.rs#L31-L39

Additional context

No response

[kostekIV]

Hi, I would like to work on this if possible

[mattsse]

assigned