63 lines
1.8 KiB
Nim
63 lines
1.8 KiB
Nim
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# light client proxy
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# Copyright (c) 2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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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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{.push raises: [Defect].}
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import
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std/tables,
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web3/ethtypes,
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stew/[results, keyed_queue]
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## payloads received through block gossip (and validated by light client).
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## Payloads are stored in order of arrival. When cache is full the oldest
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## payload is deleted first.
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type BlockCache* = ref object
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max: int
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blocks: KeyedQueue[BlockHash, ExecutionPayloadV1]
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proc `==`(x, y: Quantity): bool {.borrow, noSideEffect.}
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proc new*(T: type BlockCache, max: uint32): T =
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let maxAsInt = int(max)
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return BlockCache(
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max: maxAsInt,
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blocks: KeyedQueue[BlockHash, ExecutionPayloadV1].init(maxAsInt)
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)
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func len*(self: BlockCache): int =
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return len(self.blocks)
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func isEmpty*(self: BlockCache): bool =
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return len(self.blocks) == 0
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proc add*(self: BlockCache, payload: ExecutionPayloadV1) =
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if self.blocks.hasKey(payload.blockHash):
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return
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if len(self.blocks) >= self.max:
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discard self.blocks.shift()
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discard self.blocks.append(payload.blockHash, payload)
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proc latest*(self: BlockCache): results.Opt[ExecutionPayloadV1] =
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let latestPair = ? self.blocks.last()
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return Opt.some(latestPair.data)
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proc getByNumber*(
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self: BlockCache,
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number: Quantity): Opt[ExecutionPayloadV1] =
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var payloadResult: Opt[ExecutionPayloadV1]
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for payload in self.blocks.prevValues:
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if payload.blockNumber == number:
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payloadResult = Opt.some(payload)
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break
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return payloadResult
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