106 lines
3.5 KiB
Nim
106 lines
3.5 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2024 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
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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import ../common/common, std/strformat, results, eth/[eip1559]
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export eip1559
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{.push raises: [].}
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# ------------------------------------------------------------------------------
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# Pre Eip 1559 gas limit validation
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# ------------------------------------------------------------------------------
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proc validateGasLimit(header: BlockHeader, limit: GasInt): Result[void, string] =
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let diff =
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if limit > header.gasLimit:
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limit - header.gasLimit
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else:
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header.gasLimit - limit
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let upperLimit = limit div GAS_LIMIT_ADJUSTMENT_FACTOR
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if diff >= upperLimit:
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try:
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return err(
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&"invalid gas limit: have {header.gasLimit}, want {limit} +-= {upperLimit-1}"
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)
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except ValueError:
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# TODO deprecate-strformat
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raiseAssert "strformat cannot fail"
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if header.gasLimit < GAS_LIMIT_MINIMUM:
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return err("invalid gas limit below 5000")
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ok()
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# ------------------------------------------------------------------------------
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# Eip 1559 support
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# ------------------------------------------------------------------------------
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# consensus/misc/eip1559.go(55): func CalcBaseFee(config [..]
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proc calcEip1599BaseFee*(com: CommonRef, parent: BlockHeader): UInt256 =
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## calculates the basefee of the header.
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# If the current block is the first EIP-1559 block, return the
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# initial base fee.
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if com.isLondonOrLater(parent.number):
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eip1559.calcEip1599BaseFee(
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parent.gasLimit, parent.gasUsed, parent.baseFeePerGas.get(0.u256)
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)
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else:
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EIP1559_INITIAL_BASE_FEE
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# consensus/misc/eip1559.go(32): func VerifyEip1559Header(config [..]
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proc verifyEip1559Header(
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com: CommonRef, parent, header: BlockHeader
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): Result[void, string] {.raises: [].} =
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## Verify that the gas limit remains within allowed bounds
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let limit =
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if com.isLondonOrLater(parent.number):
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parent.gasLimit
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else:
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parent.gasLimit * EIP1559_ELASTICITY_MULTIPLIER
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let rc = header.validateGasLimit(limit)
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if rc.isErr:
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return rc
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let headerBaseFee = header.baseFeePerGas.get(0.u256)
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# Verify the header is not malformed
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if headerBaseFee.isZero:
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return err("Post EIP-1559 header expected to have base fee")
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# Verify the baseFee is correct based on the parent header.
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var expectedBaseFee = com.calcEip1599BaseFee(parent)
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if headerBaseFee != expectedBaseFee:
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try:
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return err(
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&"invalid baseFee: have {expectedBaseFee}, " & &"want {header.baseFeePerGas}, " &
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&"parent.baseFee {parent.baseFeePerGas}, " & &"parent.gasUsed {parent.gasUsed}"
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)
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except ValueError:
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# TODO deprecate-strformat
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raiseAssert "strformat cannot fail"
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return ok()
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proc validateGasLimitOrBaseFee*(
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com: CommonRef, header, parent: BlockHeader
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): Result[void, string] =
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if not com.isLondonOrLater(header.number):
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# Verify BaseFee not present before EIP-1559 fork.
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let baseFeePerGas = header.baseFeePerGas.get(0.u256)
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if not baseFeePerGas.isZero:
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return
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err("invalid baseFee before London fork: have " & $baseFeePerGas & ", want <0>")
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?validateGasLimit(header, parent.gasLimit)
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else:
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?com.verifyEip1559Header(parent = parent, header = header)
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return ok()
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