88 lines
3.3 KiB
Nim
88 lines
3.3 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2021 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/[strutils, parseutils],
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stew/byteutils,
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../beacon_node_common, ../validators/validator_duties,
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../consensus_object_pools/[block_pools_types, blockchain_dag],
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../spec/[datatypes, digest, helpers]
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export blockchain_dag
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template withStateForStateId*(stateId: string, body: untyped): untyped =
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let
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bs = node.stateIdToBlockSlot(stateId)
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template isState(state: StateData): bool =
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state.blck.atSlot(getStateField(state, slot)) == bs
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if isState(node.dag.headState):
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withStateVars(node.dag.headState):
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var cache {.inject.}: StateCache
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body
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else:
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let rpcState = assignClone(node.dag.headState)
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node.dag.withState(rpcState[], bs):
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body
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proc toBlockSlot*(blckRef: BlockRef): BlockSlot =
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blckRef.atSlot(blckRef.slot)
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proc parseRoot*(str: string): Eth2Digest {.raises: [Defect, ValueError].} =
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Eth2Digest(data: hexToByteArray[32](str))
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func checkEpochToSlotOverflow*(epoch: Epoch) {.raises: [Defect, ValueError].} =
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const maxEpoch = compute_epoch_at_slot(not 0'u64)
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if epoch >= maxEpoch:
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raise newException(
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ValueError, "Requesting epoch for which slot would overflow")
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proc doChecksAndGetCurrentHead*(node: BeaconNode, slot: Slot): BlockRef {.raises: [Defect, CatchableError].} =
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result = node.dag.head
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if not node.isSynced(result):
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raise newException(CatchableError, "Cannot fulfill request until node is synced")
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# TODO for now we limit the requests arbitrarily by up to 2 epochs into the future
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if result.slot + uint64(2 * SLOTS_PER_EPOCH) < slot:
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raise newException(CatchableError, "Requesting way ahead of the current head")
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proc doChecksAndGetCurrentHead*(node: BeaconNode, epoch: Epoch): BlockRef {.raises: [Defect, CatchableError].} =
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checkEpochToSlotOverflow(epoch)
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node.doChecksAndGetCurrentHead(epoch.compute_start_slot_at_epoch)
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proc getBlockSlotFromString*(node: BeaconNode, slot: string): BlockSlot {.raises: [Defect, CatchableError].} =
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if slot.len == 0:
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raise newException(ValueError, "Empty slot number not allowed")
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var parsed: BiggestUInt
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if parseBiggestUInt(slot, parsed) != slot.len:
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raise newException(ValueError, "Not a valid slot number")
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let head = node.doChecksAndGetCurrentHead(parsed.Slot)
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head.atSlot(parsed.Slot)
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proc stateIdToBlockSlot*(node: BeaconNode, stateId: string): BlockSlot {.raises: [Defect, CatchableError].} =
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case stateId:
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of "head":
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node.dag.head.toBlockSlot()
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of "genesis":
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node.dag.getGenesisBlockSlot()
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of "finalized":
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node.dag.finalizedHead
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of "justified":
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node.dag.head.atEpochStart(
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getStateField(node.dag.headState, current_justified_checkpoint).epoch)
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else:
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if stateId.startsWith("0x"):
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let blckRoot = parseRoot(stateId)
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let blckRef = node.dag.getRef(blckRoot)
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if blckRef.isNil:
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raise newException(CatchableError, "Block not found")
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blckRef.toBlockSlot()
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else:
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node.getBlockSlotFromString(stateId)
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