# beacon_chain # Copyright (c) 2018-2021 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. # import ../interpreter # included to be able to use "suite" func setup_no_votes(): tuple[fork_choice: ForkChoiceBackend, ops: seq[Operation]] = let balances = newSeq[Gwei](16) let GenesisRoot = fakeHash(0) # Initialize the fork choice context # We start with epoch 0 fully finalized to avoid epoch 0 special cases. result.fork_choice = ForkChoiceBackend.init( justifiedCheckpoint = Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalizedCheckpoint = Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # ---------------------------------- # Head should be genesis result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: GenesisRoot ) # Add block 2 # # 0 # / # 2 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(2), parent_root: GenesisRoot, blk_justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Head should be 2 # # 0 # / # 2 <- head result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(2) ) # Add block 1 as a fork # # 0 # / \ # 2 1 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(1), parent_root: GenesisRoot, blk_justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Head is still 2 due to tiebreaker as fakeHash(2) (0xD8...) > fakeHash(1) (0x7C...) # # 0 # / \ # head-> 2 1 result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(2) ) # Add block 3 # # 0 # / \ # 2 1 # | # 3 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(3), parent_root: fakeHash(1), blk_justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Head is still 2 # # 0 # / \ # head-> 2 1 # | # 3 result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(2) ) # Add block 4 # # 0 # / \ # 2 1 # | | # 4 3 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(4), parent_root: fakeHash(2), blk_justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Check that head is 4 # # 0 # / \ # 2 1 # | | # head-> 4 3 result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(4) ) # Add block 5 with justified epoch of 2 # # 0 # / \ # 2 1 # | | # 4 3 # | # 5 <- justified epoch = 2 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(5), parent_root: fakeHash(4), blk_justified_checkpoint: Checkpoint(root: fakeHash(5), epoch: Epoch(2)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Ensure the head is still 4 whilst the justified epoch is 0. # # 0 # / \ # 2 1 # | | # head-> 4 3 # | # 5 result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(4) ) # Ensure that there is an error when starting from a block with the wrong justified epoch # 0 # / \ # 2 1 # | | # 4 3 # | # 5 <- starting from 5 with justified epoch 0 should error. result.ops.add Operation( kind: InvalidFindHead, justified_checkpoint: Checkpoint(root: fakeHash(5), epoch: Epoch(1)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances ) # Set the justified epoch to 2 and the start block to 5 and ensure 5 is the head. # 0 # / \ # 2 1 # | | # 4 3 # | # 5 <- head result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: fakeHash(5), epoch: Epoch(2)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(5) ) # Add block 6 # # 0 # / \ # 2 1 # | | # 4 3 # | # 5 <- justified root # | # 6 result.ops.add Operation( kind: ProcessBlock, root: fakeHash(6), parent_root: fakeHash(5), blk_justified_checkpoint: Checkpoint(root: fakeHash(5), epoch: Epoch(2)), blk_finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)) ) # Ensure 6 is the head # 0 # / \ # 2 1 # | | # 4 3 # | # 5 <- justified root # | # 6 <- head result.ops.add Operation( kind: FindHead, justified_checkpoint: Checkpoint(root: fakeHash(5), epoch: Epoch(2)), finalized_checkpoint: Checkpoint(root: GenesisRoot, epoch: Epoch(1)), justified_state_balances: balances, expected_head: fakeHash(6) ) proc test_no_votes() = test "fork_choice - testing no votes": # for i in 0 ..< 6: # echo " block (", i, ") hash: ", fakeHash(i) # echo " ------------------------------------------------------" var (ctx, ops) = setup_no_votes() ctx.run(ops) test_no_votes()