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:

reth/crates/rpc/rpc/src/debug.rs

Lines 1024 to 1030 in edbbc96

	struct DebugApiInner<Provider, Eth> {
	/// The provider that can interact with the chain.
	provider: Provider,
	/// The implementation of `eth` API
	eth_api: Eth,
	// restrict the number of concurrent calls to blocking calls
	blocking_task_guard: BlockingTaskGuard,

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:
   

   reth/crates/rpc/rpc/src/eth/core.rs

   Lines 40 to 47 in edbbc96

   	pub fn new(
   	provider: Provider,
   	pool: Pool,
   	network: Network,
   	eth_cache: EthStateCache,
   	gas_oracle: GasPriceOracle<Provider>,
   	gas_cap: impl Into<GasCap>,
   	eth_proof_window: u64,

2. add a guard instance:
   

   reth/crates/rpc/rpc/src/eth/core.rs

   Line 156 in edbbc96

   pub struct EthApiInner<Provider, Pool, Network, EvmConfig> {

3. expose acquire functions in

   reth/crates/rpc/rpc-eth-api/src/helpers/blocking_task.rs

   Line 10 in edbbc96

   pub trait SpawnBlocking: Clone + Send + Sync + 'static {

   
   similar to
   

   reth/crates/tasks/src/pool.rs

   Lines 31 to 39 in edbbc96

   	/// See also [`Semaphore::acquire_owned`]
   	pub async fn acquire_owned(self) -> Result<OwnedSemaphorePermit, AcquireError> {
   	self.0.acquire_owned().await
   	}
   	/// See also [`Semaphore::acquire_many_owned`]
   	pub async fn acquire_many_owned(self, n: u32) -> Result<OwnedSemaphorePermit, AcquireError> {
   	self.0.acquire_many_owned(n).await
   	}

Additional context

No response

[kostekIV]

Hi, I would like to work on this if possible

[mattsse]

assigned