78 lines
2.7 KiB
Nim
78 lines
2.7 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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std/[strformat],
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./difficulty
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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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# 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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