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nimbus-eth2/tests/fork_choice/scenarios/ffg_02.nim

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# beacon_chain
# Copyright (c) 2018-2023 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
# import ../interpreter # included to be able to use "suite"
func setup_finality_02(): tuple[fork_choice: ForkChoiceBackend, ops: seq[Operation]] =
let balances = @[Gwei(1), Gwei(1)]
let GenesisRoot = fakeHash(0)
# Initialize the fork choice context
result.fork_choice = ForkChoiceBackend.init(
FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
# ----------------------------------
# Head should be genesis
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
justified_state_balances: balances,
expected_head: GenesisRoot)
# Build the following tree.
#
# 0
# / \
# just: 0, fin: 0 -> 1 2 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 3 4 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 5 6 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 7 8 <- just: 1, fin: 0
# | |
# just: 2, fin: 0 -> 9 10 <- just: 2, fin: 0
# Left branch
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Slot(1),
root: fakeHash(1)),
parent_root: GenesisRoot,
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(2).start_slot,
root: fakeHash(3)),
parent_root: fakeHash(1),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(1), epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(2).start_slot + 2,
root: fakeHash(5)),
parent_root: fakeHash(3),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(1), epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(2).start_slot + 4,
root: fakeHash(7)),
parent_root: fakeHash(5),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(1), epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(3).start_slot,
root: fakeHash(9)),
parent_root: fakeHash(7),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(3), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
# Build the following tree.
#
# 0
# / \
# just: 0, fin: 0 -> 1 2 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 3 4 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 5 6 <- just: 0, fin: 0
# | |
# just: 1, fin: 0 -> 7 8 <- just: 1, fin: 0
# | |
# just: 2, fin: 0 -> 9 10 <- just: 2, fin: 0
# Right branch
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Slot(2),
root: fakeHash(2)),
parent_root: GenesisRoot,
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(1).start_slot + 1,
root: fakeHash(4)),
parent_root: fakeHash(2),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(2).start_slot + 3,
root: fakeHash(6)),
parent_root: fakeHash(4),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(3).start_slot + 1,
root: fakeHash(8)),
parent_root: fakeHash(6),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(2), epoch: Epoch(1)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
result.ops.add Operation(
kind: ProcessBlock,
bid: BlockId(
slot: Epoch(5).start_slot + 1,
root: fakeHash(10)),
parent_root: fakeHash(8),
blk_checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))))
# Ensure that if we start at 0 we find 10 (just: 0, fin: 0).
#
# 0 <-- start
# / \
# 1 2
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# 9 10 <-- head
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Same with justified_epoch 2
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Justified epoch 3 is invalid
result.ops.add Operation(
kind: InvalidFindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(3)), # < Wrong epoch
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances)
# Add a vote to 1.
#
# 0
# / \
# +1 vote -> 1 2
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# 9 10
result.ops.add Operation(
kind: ProcessAttestation,
validator_index: ValidatorIndex(0),
block_root: fakeHash(1),
target_epoch: Epoch(0))
# Ensure that if we start at 0 we find 9 (just: 0, fin: 0).
#
# 0 <-- start
# / \
# 1 2
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# head -> 9 10
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(9))
# Same with justified_epoch 2
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(3), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(9))
# Justified epoch 3 is invalid
result.ops.add Operation(
kind: InvalidFindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(3)), # < Wrong epoch
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances)
# Add a vote to 2.
#
# 0
# / \
# 1 2 <- +1 vote
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# 9 10
result.ops.add Operation(
kind: ProcessAttestation,
validator_index: ValidatorIndex(1),
block_root: fakeHash(2),
target_epoch: Epoch(0))
# Ensure that if we start at 0 we find 10 again (just: 0, fin: 0).
#
# 0 <-- start
# / \
# 1 2
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# 9 10 <-- head
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Same with justified_epoch 2
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Justified epoch 3 is invalid
result.ops.add Operation(
kind: InvalidFindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: GenesisRoot, epoch: Epoch(3)), # < Wrong epoch
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances)
# Ensure that if we start at 1 (instead of 0) we find 9 (just: 0, fin: 0).
#
# 0
# / \
# start-> 1 2
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# head -> 9 10
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
# Justified: In production the root/epoch mismatch isn't used.
justified: Checkpoint(root: fakeHash(1), epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(9))
# Same with justified_epoch 2
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(3), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(9))
# Justified epoch 3 is invalid
result.ops.add Operation(
kind: InvalidFindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(5), epoch: Epoch(3)), # < Wrong epoch
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances)
# Ensure that if we start at 2 (instead of 0) we find 10 (just: 0, fin: 0).
#
# 0
# / \
# 1 2 <- start
# | |
# 3 4
# | |
# 5 6
# | |
# 7 8
# | |
# 9 10 <- head
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
# Justified: In production this can't happen
justified: Checkpoint(root: fakeHash(2), epoch: Epoch(0)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Same with justified_epoch 2
result.ops.add Operation(
kind: FindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(2)),
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances,
expected_head: fakeHash(10))
# Justified epoch 3 is invalid
result.ops.add Operation(
kind: InvalidFindHead,
checkpoints: FinalityCheckpoints(
justified: Checkpoint(root: fakeHash(4), epoch: Epoch(3)), # < Wrong epoch
finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(0))),
justified_state_balances: balances)
proc test_ffg02() =
test "fork_choice - testing finality #02":
# for i in 0 ..< 12:
# echo " block (", i, ") hash: ", fakeHash(i)
# echo " ------------------------------------------------------"
var (ctx, ops) = setup_finality_02()
ctx.run(ops)
test_ffg02()
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