eth_feeHistory invalid cached response

[georgi-l95]

Description

The cache for eth_feeHistory is set no matter what the input is. That's resolved to an invalid response 👇

• make a request with "latest" param
• the relay caches the response
• same response will be returned for the next 1 hour (cache TTL) no matter that there is a new block in that interval

Proposed fix:

• do not cache "latest" or "pending" queries
• refactor the cache key to include blockCount, newestBlock and rewardPercentilesс

Steps to reproduce

Execute multiple eth_feeHistory calls and observe that oldestBlock is always the same.

{
  "method": "eth_feeHistory",
  "params": ["0x4", "latest", [50]],
  "id": 2,
  "jsonrpc": "2.0"
}

Additional context

No response

Hedera network

other

Version

latest

Operating system

None