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client: add feeHistory method #2413

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client: add feeHistory method #2413

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36 changes: 36 additions & 0 deletions packages/client/lib/rpc/modules/eth.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -360,6 +360,9 @@ export class Eth {
1,
[[validators.blockOption]]
)

this.feeHistory = middleware(this.feeHistory.bind(this), 0, [])
this.gasPrice = middleware(this.gasPrice.bind(this), 0, [])
}

/**
Expand Down Expand Up @@ -986,4 +989,37 @@ export class Eth {
const block = await getBlockByOption(blockOpt, this._chain)
return intToHex(block.transactions.length)
}

async feeHistory(_params = []) {
const latest = await this._chain.getCanonicalHeadHeader()
return {
baseFeePerGas: [
'0x' + latest.baseFeePerGas?.toString(16),
'0x' + latest.baseFeePerGas?.toString(16),
],
oldestBlock: '0x' + latest.number.toString(16),
gasUsedRatio: [0.5],
}
}

/**
* Returns an estimate of the current gas price based on the most recent block
* @returns the current gasPrice in gwei as a hex prefixed string
*/
async gasPrice() {
let gasPrice: bigint = BigInt(0)
const latest = await this._chain.getCanonicalHeadHeader()
if (this._vm !== undefined && this._vm._common.isActivatedEIP(1559)) {
gasPrice = latest.calcNextBaseFee()
} else {
if (latest.gasUsed > BigInt(0)) gasPrice = latest.gasUsed
else {
while (gasPrice === BigInt(0)) {
const nextBlock = await this._chain.getBlock(latest.number - BigInt(1))
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are you looping always on the same block ?

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This is out of date. We merged a separate PR recently for eth_gasPrice.

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So to add: see comment here #2413 (comment)

if (nextBlock.header.gasUsed > BigInt(0)) gasPrice = nextBlock.header.gasUsed
}
}
}
return '0x' + gasPrice.toString(16)
}
}