104 lines
3.6 KiB
Nim
104 lines
3.6 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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strformat, times, options,
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eth/[common, rlp],
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./difficulty, ../constants,
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../chain_config
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export BlockHeader
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proc hasUncles*(header: BlockHeader): bool = header.ommersHash != EMPTY_UNCLE_HASH
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proc `$`*(header: BlockHeader): string =
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result = &"BlockHeader(timestamp: {header.timestamp} difficulty: {header.difficulty} blockNumber: {header.blockNumber} gasLimit: {header.gasLimit})"
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# CalcGasLimit computes the gas limit of the next block after parent. It aims
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# to keep the baseline gas above the provided floor, and increase it towards the
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# ceil if the blocks are full. If the ceil is exceeded, it will always decrease
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# the gas allowance.
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func computeGasLimit*(parentGasUsed, parentGasLimit, gasFloor, gasCeil: GasInt): GasInt =
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# contrib = (parentGasUsed * 3 / 2) / 1024
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let contrib = (parentGasUsed + parentGasUsed div 2) div GAS_LIMIT_ADJUSTMENT_FACTOR
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# decay = parentGasLimit / 1024 -1
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let decay = parentGasLimit div GAS_LIMIT_ADJUSTMENT_FACTOR - 1
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#[
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strategy: gasLimit of block-to-mine is set based on parent's
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gasUsed value. if parentGasUsed > parentGasLimit * (2/3) then we
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increase it, otherwise lower it (or leave it unchanged if it's right
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at that usage) the amount increased/decreased depends on how far away
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from parentGasLimit * (2/3) parentGasUsed is.
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]#
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var limit = parentGasLimit - decay + contrib
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if limit < GAS_LIMIT_MINIMUM:
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limit = GAS_LIMIT_MINIMUM
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# If we're outside our allowed gas range, we try to hone towards them
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if limit < gasFloor:
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limit = parentGasLimit + decay
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if limit > gasFloor:
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limit = gasFloor
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elif limit > gasCeil:
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limit = parentGasLimit - decay
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if limit < gasCeil:
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limit = gasCeil
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return limit
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proc generateHeaderFromParentHeader*(config: ChainConfig, parent: BlockHeader,
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coinbase: EthAddress, timestamp: Option[EthTime],
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gasLimit: GasInt, extraData: Blob, baseFee: Option[Uint256]): BlockHeader =
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var lcTimestamp: EthTime
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if timestamp.isNone:
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lcTimeStamp = max(getTime(), parent.timestamp + 1.milliseconds) # Note: Py-evm uses +1 second, not ms
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else:
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lcTimestamp = timestamp.get()
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if lcTimestamp <= parent.timestamp:
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raise newException(ValueError, "header.timestamp should be higher than parent.timestamp")
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result = BlockHeader(
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timestamp: lcTimestamp,
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blockNumber: (parent.blockNumber + 1),
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difficulty: config.calcDifficulty(lcTimestamp, parent),
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gasLimit: gasLimit,
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stateRoot: parent.stateRoot,
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coinbase: coinbase,
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extraData: extraData,
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fee: baseFee
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)
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# CalcGasLimit1559 calculates the next block gas limit under 1559 rules.
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func calcGasLimit1559*(parentGasLimit, desiredLimit: GasInt): GasInt =
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let delta = parentGasLimit div GAS_LIMIT_ADJUSTMENT_FACTOR - 1.GasInt
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var limit = parentGasLimit
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var desiredLimit = desiredLimit
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if desiredLimit < GAS_LIMIT_MINIMUM:
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desiredLimit = GAS_LIMIT_MINIMUM
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# If we're outside our allowed gas range, we try to hone towards them
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if limit < desiredLimit:
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limit = parentGasLimit + delta
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if limit > desiredLimit:
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limit = desiredLimit
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return limit
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if limit > desiredLimit:
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limit = parentGasLimit - delta
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if limit < desiredLimit:
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limit = desiredLimit
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return limit
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