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rpc: update fee estimation RPCs to support EIP-1559 tools e.g. MetaMask #190

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rpc: update fee estimation RPCs to support EIP-1559 tools e.g. MetaMask #190

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18 changes: 16 additions & 2 deletions eth/api_backend.go
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Original file line number Diff line number Diff line change
Expand Up @@ -374,11 +374,25 @@ func (b *EthAPIBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error)
return nil, err
}
minGasTipCap := stateDb.GetState(systemcontracts.PolicyProxyHash, systemcontracts.GetMinGasTipCapStateHash()).Big()
return cmath.BigMax(suggestTipCap, minGasTipCap), nil
denom := new(big.Int).SetUint64(b.eth.blockchain.Config().BaseFeeChangeDenominator())
return cmath.BigMax(suggestTipCap, minGasTipCap.Add(minGasTipCap, new(big.Int).Div(minGasTipCap, denom))), nil
}

func (b *EthAPIBackend) FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (firstBlock *big.Int, reward [][]*big.Int, baseFee []*big.Int, gasUsedRatio []float64, err error) {
return b.gpo.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
oldestBlock, reward, baseFee, gasUsedRatio, err := b.gpo.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
if err != nil {
return nil, nil, nil, nil, err
}
suggestGasTipCap, err := b.SuggestGasTipCap(ctx)
if err != nil {
return nil, nil, nil, nil, err
}
for i, r := range reward {
for j, v := range r {
reward[i][j] = cmath.BigMax(suggestGasTipCap, v)
}
}
return oldestBlock, reward, baseFee, gasUsedRatio, nil
}

func (b *EthAPIBackend) ChainDb() ethdb.Database {
Expand Down