63 lines
2.1 KiB
Nim
63 lines
2.1 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 stint
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type
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Fork* = enum
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# FkGenesis
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FkFrontier,
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FkThawing,
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FkHomestead,
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FkDao,
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FkTangerine,
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FkSpurious,
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FkByzantium
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UInt256Pair = tuple[a: Uint256, b: Uint256]
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let forkBlocks: array[Fork, Uint256] = [
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FkFrontier: 1.u256, # 30/07/2015 19:26:28
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FkThawing: 200_000.u256, # 08/09/2015 01:33:09
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FkHomestead: 1_150_000.u256, # 14/03/2016 20:49:53
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FkDao: 1_920_000.u256, # 20/07/2016 17:20:40
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FkTangerine: 2_463_000.u256, # 18/10/2016 17:19:31
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FkSpurious: 2_675_000.u256, # 22/11/2016 18:15:44
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FkByzantium: 4_370_000.u256 # 16/10/2017 09:22:11
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]
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proc toFork*(blockNumber: UInt256): Fork =
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# TODO: uint256 comparison is probably quite expensive
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# hence binary search is probably worth it earlier than
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# linear search
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# TODO: all toFork usage currently incurs comparison to get the fork and then another comparison to
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# go to the ultimate needed result.
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# Genesis block 0 also uses the Frontier code path
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if blockNumber < forkBlocks[FkThawing]: FkFrontier
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elif blockNumber < forkBlocks[FkHomestead]: FkThawing
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elif blockNumber < forkBlocks[FkDao]: FkHomestead
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elif blockNumber < forkBlocks[FkTangerine]: FkDao
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elif blockNumber < forkBlocks[FkSpurious]: FkTangerine
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elif blockNumber < forkBlocks[FkByzantium]: FkSpurious
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else:
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FkByzantium # Update for constantinople when announced
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proc `$`*(fork: Fork): string =
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case fork
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of FkFrontier: result = "Frontier"
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of FkThawing: result = "Thawing"
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of FkHomestead: result = "Homestead"
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of FkDao: result = "Dao"
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of FkTangerine: result = "Tangerine Whistle"
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of FkSpurious: result = "Spurious Dragon"
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of FkByzantium: result = "Byzantium"
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else: result = "UNKNOWN FORK"
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