feat: implement eth_feeHistory endpoint #502
Open
+287
−40
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Fixes #501
Implements eth_feeHistory endpoint. The query supports returning the history for the maximum last 20 blocks (this arbitrarily set limit is allowed as per spec: Requested range of blocks. Clients will return less than the requested range if not all blocks are available.)
To avoid fetching multiple blocks, transactions, and receipts from DB on every fee_history query (which can be expensive) the fee_history for last 20 blocks is continuously pre-computed in the gas oracle (only the percentiles are computed on the fly).
TODO: