nimbus-eth1/nimbus/merge/mergetypes.nim

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