2023-05-05 07:58:58 +00:00
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from carnot import *
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from unittest import TestCase
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from itertools import chain
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class MockCarnot(Carnot):
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def __init__(self, id):
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super(MockCarnot, self).__init__(id)
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def rebuild_overlay_from_timeout_qc(self, timeout_qc: TimeoutQc):
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pass
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class MockOverlay(Overlay):
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"""
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Overlay for 5 nodes where the leader is the single member of the root committee
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0
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│
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1◄──┴──►2
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│
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3◄─┴─►4
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"""
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def __init__(self):
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self.parents = {
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int_to_id(1): {int_to_id(0)},
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int_to_id(2): {int_to_id(0)},
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int_to_id(3): {int_to_id(1)},
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int_to_id(4): {int_to_id(1)}
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}
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self.childs = {
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int_to_id(0): {
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int_to_id(1), int_to_id(2)
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},
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int_to_id(1): {
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int_to_id(3), int_to_id(4)
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}
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}
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self.leafs = {
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int_to_id(2), int_to_id(3), int_to_id(4)
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}
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def leaf_committees(self) -> Set[Committee]:
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return [[leaf] for leaf in self.leafs]
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def root_committee(self) -> Committee:
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return {int_to_id(0)}
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def is_child_of_root_committee(self, _id: Id) -> bool:
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return _id in {int_to_id(1), int_to_id(2)}
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def is_member_of_child_committee(self, parent: Id, child: Id) -> bool:
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return child in childs if (childs := self.childs.get(parent)) else False
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def leader_super_majority_threshold(self, _id: Id) -> int:
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return 3
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def is_leader(self, _id: Id):
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# Leader is the node with id 0, otherwise not
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return _id == int_to_id(0)
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def is_member_of_root_committee(self, _id: Id):
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return _id == int_to_id(0)
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def leader(self, view: View) -> Id:
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return int_to_id(0)
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def parent_committee(self, _id: Id) -> Optional[Committee]:
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return self.parents.get(_id)
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def is_member_of_leaf_committee(self, _id: Id) -> bool:
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return _id in self.leafs
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def super_majority_threshold(self, _id: Id) -> int:
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thresholds = {
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int_to_id(0): 2,
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int_to_id(1): 2,
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}
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return thresholds.get(_id, 0)
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def add_genesis_block(carnot: Carnot) -> Block:
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genesis_block = Block(view=0, qc=StandardQc(block=b"", view=0), _id=b"")
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carnot.safe_blocks[genesis_block.id()] = genesis_block
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carnot.receive_block(genesis_block)
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carnot.local_high_qc = genesis_block.qc
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carnot.current_view = 1
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return genesis_block
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2023-05-24 11:44:23 +00:00
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def initial_setup(test_case: TestCase, overlay: MockOverlay, size: int) -> (Dict[Id, Carnot], MockCarnot, Block):
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2023-05-05 07:58:58 +00:00
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nodes = {int_to_id(i): MockCarnot(int_to_id(i)) for i in range(size)}
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# add overlay
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for node in nodes.values():
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node.overlay = overlay
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leader: MockCarnot = nodes[overlay.leader(0)]
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genesis_block = None
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for node in nodes.values():
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genesis_block = add_genesis_block(node)
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# votes for genesis block
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genesis_votes = set(
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Vote(
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block=genesis_block.id(),
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view=0,
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voter=int_to_id(i),
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qc=StandardQc(
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block=genesis_block.id(),
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view=0
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),
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) for i in range(5)
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)
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proposed_block = leader.propose_block(1, genesis_votes).payload
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test_case.assertIsNotNone(proposed_block)
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return nodes, leader, proposed_block
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def parents_from_childs(overlay: MockOverlay, childs: List[Id]) -> Set[Id]:
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if len(childs) == 0:
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return set()
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possible_parents = filter(
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lambda x: x is not None,
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chain.from_iterable(parent for _id in childs if (parent := overlay.parent_committee(_id)))
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)
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return set(possible_parents) if possible_parents else set()
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2023-05-18 16:29:28 +00:00
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def succeed(test_case: TestCase, overlay: Overlay, nodes: Dict[Id, Carnot], proposed_block: Block) -> List[Vote]:
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2023-05-05 07:58:58 +00:00
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# broadcast the block
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for node in nodes.values():
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node.receive_block(proposed_block)
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votes = {}
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childs_ids = list(chain.from_iterable(overlay.leaf_committees()))
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leafs = [nodes[_id] for _id in childs_ids]
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for node in leafs:
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vote = node.approve_block(proposed_block, set()).payload
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votes[node.id] = vote
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while len(parents := parents_from_childs(overlay, childs_ids)) != 0:
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for node_id in parents:
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node = nodes[node_id]
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child_votes = [votes[_id] for _id in votes.keys() if overlay.is_member_of_child_committee(node_id, _id)]
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if len(child_votes) == overlay.super_majority_threshold(node_id) and node_id not in votes:
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vote = node.approve_block(proposed_block, child_votes).payload
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votes[node_id] = vote
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childs_ids = list(set(parents))
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root_votes = [
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votes[node_id]
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for node_id in nodes
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if overlay.is_member_of_root_committee(node_id) or overlay.is_child_of_root_committee(node_id)
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]
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return root_votes
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2023-05-18 16:29:28 +00:00
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def fail(test_case: TestCase, overlay: Overlay, nodes: Dict[Id, Carnot], proposed_block: Block) -> List[NewView]:
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2023-05-05 07:58:58 +00:00
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# broadcast the block
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for node in nodes.values():
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node.receive_block(proposed_block)
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node: MockCarnot
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timeouts = []
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for node in (nodes[_id] for _id in nodes if overlay.is_member_of_root_committee(_id) or overlay.is_child_of_root_committee(_id)):
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timeout = node.local_timeout().payload
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timeouts.append(timeout)
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root_member = next(nodes[_id] for _id in nodes if overlay.is_member_of_root_committee(_id))
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timeout_qc = root_member.timeout_detected(timeouts).payload
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for node in nodes.values():
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node.receive_timeout_qc(timeout_qc)
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votes = {}
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childs_ids = list(chain.from_iterable(overlay.leaf_committees()))
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leafs = [nodes[_id] for _id in childs_ids]
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for node in leafs:
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vote = node.approve_new_view(timeout_qc, set()).payload
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votes[node.id] = vote
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while len(parents := parents_from_childs(overlay, childs_ids)) != 0:
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for node_id in parents:
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node = nodes[node_id]
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child_votes = [votes[_id] for _id in votes.keys() if overlay.is_member_of_child_committee(node_id, _id)]
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if len(child_votes) == overlay.super_majority_threshold(node_id) and node_id not in votes:
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vote = node.approve_new_view(timeout_qc, child_votes).payload
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votes[node_id] = vote
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childs_ids = list(set(parents))
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root_votes = [
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votes[node_id]
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for node_id in nodes
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if overlay.is_member_of_root_committee(node_id) or overlay.is_child_of_root_committee(node_id)
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]
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return root_votes
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class TestCarnotUnhappyPath(TestCase):
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def test_timeout_high_qc(self):
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"""
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At the end of the timeout the highQC in the next leader's aggregatedQC should be the highestQC held by the
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majority of nodes or a qc higher than th highestQC held by the majority of nodes.
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Majority means more than two thirds of total number of nodes, randomly assigned to committees.
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"""
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overlay = MockOverlay()
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2023-05-24 11:44:23 +00:00
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nodes, leader, proposed_block = initial_setup(self, overlay, 5)
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2023-05-05 07:58:58 +00:00
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# In this loop 'view' is the view that fails
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for view in range(1, 4, 2):
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# When view v fails, a timeout qc is built for view v and nodes jump to view v + 1
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# while aggregating votes for the high qc. Those votes are then forwarded to the leader of view v + 2
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# which can propose a block with those aggregate votes as proof of the previous round completion.
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root_votes = fail(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(view+2, root_votes).payload
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# Add final assertions on nodes
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# Thus, the first block that can be proposed is 2 views after the timeout
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self.assertEqual(proposed_block.view, view + 2)
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# Its qc is always for the view before the block is proposed for
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self.assertEqual(proposed_block.qc.view, view + 1)
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# The high qc is 0, since we never had a successful round
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self.assertEqual(proposed_block.qc.high_qc().view, 0)
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self.assertEqual(leader.last_view_timeout_qc.view, view)
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self.assertEqual(leader.local_high_qc.view, 0)
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self.assertEqual(leader.highest_voted_view, view+1)
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for node in nodes.values():
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self.assertEqual(node.latest_committed_view(), 0)
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def test_interleave_success_fails(self):
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"""
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At the end of the timeout the highQC in the next leader's aggregatedQC should be the highestQC held by the
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majority of nodes or a qc higher than th highestQC held by the majority of nodes.
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Majority means more than two thirds of total number of nodes, randomly assigned to committees.
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"""
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overlay = MockOverlay()
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leader: MockCarnot
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2023-05-24 11:44:23 +00:00
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nodes, leader, proposed_block = initial_setup(self, overlay, 5)
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2023-05-05 07:58:58 +00:00
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for view in range(2, 5):
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root_votes = succeed(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(view, root_votes).payload
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root_votes = fail(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(6, root_votes).payload
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for view in range(7, 8):
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root_votes = succeed(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(view, root_votes).payload
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root_votes = fail(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(9, root_votes).payload
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for view in range(10, 15):
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root_votes = succeed(self, overlay, nodes, proposed_block)
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proposed_block = leader.propose_block(view, root_votes).payload
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2023-06-07 08:04:30 +00:00
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committed_blocks = {0, 1, 2, 3, 6, 9, 10, 11}
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2023-05-05 07:58:58 +00:00
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for node in nodes.values():
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2023-06-07 08:04:30 +00:00
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self.assertEqual(committed_blocks, {block.view for block in node.committed_blocks().values()})
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