81 lines
2.2 KiB
Nim
81 lines
2.2 KiB
Nim
import
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web3/engine_api_types,
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../db/db_chain,
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./merger
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import eth/common/eth_types except BlockHeader
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export merger, eth_types
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type
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EthBlockHeader* = eth_types.BlockHeader
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const
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# maxTrackedPayloads is the maximum number of prepared payloads the execution
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# engine tracks before evicting old ones. Ideally we should only ever track the
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# latest one; but have a slight wiggle room for non-ideal conditions.
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MaxTrackedPayloads = 10
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# maxTrackedHeaders is the maximum number of executed payloads the execution
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# engine tracks before evicting old ones. Ideally we should only ever track the
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# latest one; but have a slight wiggle room for non-ideal conditions.
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MaxTrackedHeaders = 10
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type
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QueueItem[T] = object
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used: bool
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data: T
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SimpleQueue[M: static[int]; T] = object
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list: array[M, QueueItem[T]]
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PayloadItem = object
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id: PayloadID
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payload: ExecutionPayloadV1
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HeaderItem = object
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hash: Hash256
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header: EthBlockHeader
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EngineAPI* = ref object
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merger*: Merger
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payloadQueue: SimpleQueue[MaxTrackedPayloads, PayloadItem]
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headerQueue: SimpleQueue[MaxTrackedHeaders, HeaderItem]
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template shiftRight[M, T](x: var SimpleQueue[M, T]) =
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x.list[1..^1] = x.list[0..^2]
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proc put[M, T](x: var SimpleQueue[M, T], val: T) =
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x.shiftRight()
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x.list[0] = QueueItem[T](used: true, data: val)
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iterator items[M, T](x: SimpleQueue[M, T]): T =
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for z in x.list:
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if z.used:
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yield z.data
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proc new*(_: type EngineAPI, db: BaseChainDB): EngineAPI =
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new result
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if not db.isNil:
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result.merger.init(db)
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proc put*(api: EngineAPI, hash: Hash256, header: EthBlockHeader) =
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api.headerQueue.put(HeaderItem(hash: hash, header: header))
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proc get*(api: EngineAPI, hash: Hash256, header: var EthBlockHeader): bool =
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for x in api.headerQueue:
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if x.hash == hash:
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header = x.header
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return true
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false
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proc put*(api: EngineAPI, id: PayloadID, payload: ExecutionPayloadV1) =
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api.payloadQueue.put(PayloadItem(id: id, payload: payload))
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proc get*(api: EngineAPI, id: PayloadID, payload: var ExecutionPayloadV1): bool =
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for x in api.payloadQueue:
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if x.id == id:
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payload = x.payload
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return true
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false
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