67 lines
2.1 KiB
Nim
67 lines
2.1 KiB
Nim
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# 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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## Hash Cache
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## ==========
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##
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## provide LRU hash, indexed by epoch
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import
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../../utils/lru_cache,
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ethash,
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nimcrypto,
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tables
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type
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BlockEpoch = distinct uint64
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EpochHashDigest* = seq[MDigest[512]]
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EpochHashCache* = LruCache[uint64,BlockEpoch,EpochHashDigest,void]
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{.push raises: [Defect,CatchableError].}
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# ------------------------------------------------------------------------------
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# Private cache management functions
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# ------------------------------------------------------------------------------
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# needed for table key to work
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proc `==`(a,b: BlockEpoch): bool {.borrow.}
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc initEpochHashCache*(cache: var EpochHashCache; cacheMaxItems = 10) =
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## Initialise a new cache indexed by block epoch
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template bnToEpoch(num: uint64): BlockEpoch =
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BlockEpoch(blockNumber div EPOCH_LENGTH)
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var toKey: LruKey[uint64,BlockEpoch] =
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proc(blockNumber: uint64): BlockEpoch =
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blockNumber.bnToEpoch
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var toValue: LruValue[uint64,EpochHashDigest,void] =
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proc(blockNumber: uint64): Result[EpochHashDigest,void] =
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let top = blockNumber.bnToEpoch.uint64 * EPOCH_LENGTH
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ok( mkcache( getCacheSize(top), getSeedhash(top)))
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cache.initLruCache(toKey, toValue, cacheMaxItems)
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proc getEpochHash*(cache: var EpochHashCache;
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blockNumber: uint64): auto {.inline.} =
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## Return hash list, indexed by epoch of argument `blockNumber`
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cache.getLruItem(blockNumber).value
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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