251 lines
8.2 KiB
Nim
251 lines
8.2 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
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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
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../../chain_config,
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../../db/db_chain,
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../../genesis,
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../../utils,
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../../chain_config,
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../clique,
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../validate,
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../validate/epoch_hash_cache,
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chronicles,
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eth/[common, trie/db],
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stew/endians2,
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stint
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type
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# Chain's forks not always equals to EVM's forks
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ChainFork* = enum
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Frontier,
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Homestead,
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DAOFork,
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Tangerine,
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Spurious,
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Byzantium,
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Constantinople,
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Petersburg,
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Istanbul,
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MuirGlacier,
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Berlin,
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London
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Chain* = ref object of AbstractChainDB
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db: BaseChainDB
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forkIds: array[ChainFork, ForkID]
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blockZeroHash: KeccakHash
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extraValidation: bool ##\
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## Trigger extra validation, currently within `persistBlocks()`
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## function only.
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verifyFrom: BlockNumber ##\
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## First block to when `extraValidation` will be applied (only
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## effective if `extraValidation` is true.)
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cacheByEpoch: EpochHashCache ##\
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## Objects cache to speed up hash lookup in validation functions.
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poa: Clique ##\
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## For non-PoA networks (when `db.config.poaEngine` is `false`),
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## this descriptor is ignored.
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{.push raises: [Defect].}
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# ------------------------------------------------------------------------------
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# Helpers
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# ------------------------------------------------------------------------------
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func toNextFork(n: BlockNumber): uint64 =
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if n == high(BlockNumber):
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result = 0'u64
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else:
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result = n.truncate(uint64)
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func getNextFork(c: ChainConfig, fork: ChainFork): uint64 =
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let next: array[ChainFork, uint64] = [
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0'u64,
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toNextFork(c.homesteadBlock),
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toNextFork(c.daoForkBlock),
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toNextFork(c.eip150Block),
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toNextFork(c.eip158Block),
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toNextFork(c.byzantiumBlock),
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toNextFork(c.constantinopleBlock),
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toNextFork(c.petersburgBlock),
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toNextFork(c.istanbulBlock),
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toNextFork(c.muirGlacierBlock),
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toNextFork(c.berlinBlock),
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toNextFork(c.londonBlock)
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]
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if fork == high(ChainFork):
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result = 0
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return
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result = next[fork]
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for x in fork..high(ChainFork):
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if result != next[x]:
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result = next[x]
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break
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func calculateForkId(c: ChainConfig, fork: ChainFork,
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prevCRC: uint32, prevFork: uint64): ForkID =
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result.nextFork = c.getNextFork(fork)
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if result.nextFork != prevFork:
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result.crc = crc32(prevCRC, toBytesBE(prevFork))
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else:
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result.crc = prevCRC
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func calculateForkIds(c: ChainConfig,
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genesisCRC: uint32): array[ChainFork, ForkID] =
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var prevCRC = genesisCRC
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var prevFork = c.getNextFork(Frontier)
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for fork in ChainFork:
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result[fork] = calculateForkId(c, fork, prevCRC, prevFork)
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prevFork = result[fork].nextFork
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prevCRC = result[fork].crc
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proc setForkId(c: Chain, cn: CustomNetwork)
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{. raises: [Defect,CatchableError].} =
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let g = genesisBlockForNetwork(c.db.networkId, cn)
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c.blockZeroHash = g.toBlock.blockHash
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let genesisCRC = crc32(0, c.blockZeroHash.data)
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c.forkIds = calculateForkIds(c.db.config, genesisCRC)
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# ------------------------------------------------------------------------------
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# Private constructor helper
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# ------------------------------------------------------------------------------
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proc initChain(c: Chain; db: BaseChainDB; poa: Clique; extraValidation: bool)
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{.gcsafe, raises: [Defect,CatchableError].} =
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## Constructor for the `Chain` descriptor object. For most applications,
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## the `poa` argument is transparent and should be initilaised on the fly
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## which is available below.
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c.db = db
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if not db.config.daoForkSupport:
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db.config.daoForkBlock = db.config.homesteadBlock
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c.extraValidation = extraValidation
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c.setForkId(db.customNetwork)
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# Initalise the PoA state regardless of whether it is needed on the current
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# network. For non-PoA networks (when `db.config.poaEngine` is `false`),
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# this descriptor is ignored.
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c.poa = db.newClique
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# Always initialise the epoch cache even though it migh no be used
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# unless `extraValidation` is set `true`.
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c.cacheByEpoch.initEpochHashCache
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# ------------------------------------------------------------------------------
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# Public constructors
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# ------------------------------------------------------------------------------
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proc newChain*(db: BaseChainDB; poa: Clique; extraValidation: bool): Chain
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{.gcsafe, raises: [Defect,CatchableError].} =
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## Constructor for the `Chain` descriptor object. For most applications,
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## the `poa` argument is transparent and should be initilaised on the fly
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## which is available below. The argument `extraValidation` enables extra
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## block chain validation if set `true`.
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new result
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result.initChain(db, poa, extraValidation)
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proc newChain*(db: BaseChainDB, extraValidation: bool): Chain
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{.gcsafe, raises: [Defect,CatchableError].} =
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## Constructor for the `Chain` descriptor object with default initialisation
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## for the PoA handling. The argument `extraValidation` enables extra block
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## chain validation if set `true`.
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new result
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result.initChain(db, db.newClique, extraValidation)
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proc newChain*(db: BaseChainDB): Chain
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{.gcsafe, raises: [Defect,CatchableError].} =
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## Constructor for the `Chain` descriptor object. All sub-object descriptors
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## are initialised with defaults. So is extra block chain validation
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## * `enabled` for PoA networks (such as Goerli)
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## * `disabled` for nopn-PaA networks
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new result
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result.initChain(db, db.newClique, db.config.poaEngine)
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# ------------------------------------------------------------------------------
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# Public `AbstractChainDB` getter overload methods
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# ------------------------------------------------------------------------------
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method genesisHash*(c: Chain): KeccakHash {.gcsafe.} =
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## Getter: `AbstractChainDB` overload method
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c.blockZeroHash
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method getBestBlockHeader*(c: Chain): BlockHeader
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{.gcsafe, raises: [Defect,CatchableError].} =
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## Getter: `AbstractChainDB` overload method
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c.db.getCanonicalHead()
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method getTrieDB*(c: Chain): TrieDatabaseRef {.gcsafe.} =
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## Getter: `AbstractChainDB` overload method
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c.db.db
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# ------------------------------------------------------------------------------
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# Public `Chain` getters
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# ------------------------------------------------------------------------------
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proc clique*(c: Chain): var Clique {.inline.} =
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## Getter
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c.poa
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proc cacheByEpoch*(c: Chain): var EpochHashCache {.inline.} =
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## Getter
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c.cacheByEpoch
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proc db*(c: Chain): auto {.inline.} =
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## Getter
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c.db
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proc extraValidation*(c: Chain): auto {.inline.} =
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## Getter
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c.extraValidation
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proc forkIds*(c: Chain): auto {.inline.} =
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## Getter
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c.forkIds
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proc verifyFrom*(c: Chain): auto {.inline.} =
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## Getter
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c.verifyFrom
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proc currentBlock*(c: Chain): BlockHeader
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{.gcsafe, raises: [Defect,CatchableError].} =
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## currentBlock retrieves the current head block of the canonical chain.
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## Ideally the block should be retrieved from the blockchain's internal cache.
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## but now it's enough to retrieve it from database
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c.db.getCanonicalHead()
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# ------------------------------------------------------------------------------
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# Public `Chain` setters
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# ------------------------------------------------------------------------------
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proc `extraValidation=`*(c: Chain; extraValidation: bool) {.inline.} =
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## Setter. If set `true`, the assignment value `extraValidation` enables
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## extra block chain validation.
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c.extraValidation = extraValidation
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proc `verifyFrom=`*(c: Chain; verifyFrom: uint64) {.inline.} =
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## Setter. The assignment value `verifyFrom` defines the first block where
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## validation should start if the `Clique` field `extraValidation` was set
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## `true`.
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c.verifyFrom = verifyFrom.u256
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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