258 lines
7.2 KiB
Nim
258 lines
7.2 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 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 ../interpreter # included to be able to use "suite"
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func setup_no_votes(): tuple[fork_choice: ForkChoiceBackend, ops: seq[Operation]] =
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let balances = newSeq[Gwei](16)
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let GenesisRoot = fakeHash(0)
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# Initialize the fork choice context
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# We start with epoch 0 fully finalized to avoid epoch 0 special cases.
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result.fork_choice = ForkChoiceBackend.init(
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FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# ----------------------------------
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# Head should be genesis
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: GenesisRoot)
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# Add block 2
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#
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# 0
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# /
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# 2
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(2),
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parent_root: GenesisRoot,
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Head should be 2
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#
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# 0
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# /
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# 2 <- head
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(2))
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# Add block 1 as a fork
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#
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# 0
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# / \
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# 2 1
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(1),
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parent_root: GenesisRoot,
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Head is still 2 due to tiebreaker as fakeHash(2) (0xD8...) > fakeHash(1) (0x7C...)
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#
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# 0
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# / \
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# head-> 2 1
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(2))
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# Add block 3
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#
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# 0
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# / \
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# 2 1
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# |
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# 3
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(3),
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parent_root: fakeHash(1),
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Head is still 2
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#
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# 0
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# / \
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# head-> 2 1
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# |
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# 3
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(2))
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# Add block 4
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#
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(4),
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parent_root: fakeHash(2),
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Check that head is 4
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#
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# 0
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# / \
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# 2 1
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# | |
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# head-> 4 3
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(4))
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# Add block 5 with justified epoch of 2
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#
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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# |
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# 5 <- justified epoch = 2
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(5),
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parent_root: fakeHash(4),
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: fakeHash(5), epoch: Epoch(2)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Ensure the head is still 4 whilst the justified epoch is 0.
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#
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# 0
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# / \
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# 2 1
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# | |
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# head-> 4 3
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# |
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# 5
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: GenesisRoot, epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(4))
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# Ensure that there is an error when starting from a block with the wrong justified epoch
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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# |
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# 5 <- starting from 5 with justified epoch 0 should error.
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result.ops.add Operation(
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kind: InvalidFindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: fakeHash(5), epoch: Epoch(1)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances)
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# Set the justified epoch to 2 and the start block to 5 and ensure 5 is the head.
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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# |
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# 5 <- head
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: fakeHash(5), epoch: Epoch(2)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(5))
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# Add block 6
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#
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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# |
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# 5 <- justified root
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# |
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# 6
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result.ops.add Operation(
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kind: ProcessBlock,
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root: fakeHash(6),
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parent_root: fakeHash(5),
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blk_checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: fakeHash(5), epoch: Epoch(2)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))))
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# Ensure 6 is the head
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# 0
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# / \
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# 2 1
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# | |
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# 4 3
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# |
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# 5 <- justified root
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# |
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# 6 <- head
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result.ops.add Operation(
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kind: FindHead,
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checkpoints: FinalityCheckpoints(
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justified: Checkpoint(root: fakeHash(5), epoch: Epoch(2)),
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finalized: Checkpoint(root: GenesisRoot, epoch: Epoch(1))),
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justified_state_balances: balances,
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expected_head: fakeHash(6))
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proc test_no_votes() =
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test "fork_choice - testing no votes":
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# for i in 0 ..< 6:
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# echo " block (", i, ") hash: ", fakeHash(i)
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# echo " ------------------------------------------------------"
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var (ctx, ops) = setup_no_votes()
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ctx.run(ops)
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test_no_votes()
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