def create_new_view_from_vc(vc, validators, checkpoint=None, batches=None):
vc_digest = view_change_digest(vc)
vcs = [(node_name, vc_digest) for node_name in validators]
checkpoint = checkpoint or vc.checkpoints[0]
batches = batches or vc.prepared
return NewView(vc.viewNo, sorted(vcs, key=itemgetter(0)), checkpoint,
batches)
def test_view_change_digest_is_256_bit_hexdigest(random):
digest = view_change_digest(
create_view_change(initial_view_no=0,
stable_cp=random.integer(0, 10000),
batches=create_batches(view_no=0)))
assert isinstance(digest, str)
assert len(digest) == 64
assert all(v in string.hexdigits for v in digest)
def _view_change_acks(vc, vc_frm, primary, count):
digest = view_change_digest(vc)
non_senders = [
name for name in validators if name not in [vc_frm, primary]
]
ack_frms = random.sample(non_senders, count)
return [(ViewChangeAck(viewNo=vc.viewNo, name=vc_frm,
digest=digest), ack_frm)
for ack_frm in ack_frms]
def test_different_view_change_messages_have_different_digests(random):
batches = create_batches(view_no=0)
assert view_change_digest(create_view_change(initial_view_no=0, stable_cp=100, batches=batches)) != \
view_change_digest(create_view_change(initial_view_no=1, stable_cp=100, batches=batches))
assert view_change_digest(create_view_change(initial_view_no=1, stable_cp=100, batches=batches)) != \
view_change_digest(create_view_change(initial_view_no=1, stable_cp=101, batches=batches))
assert view_change_digest(
create_view_change(initial_view_no=1, stable_cp=100, batches=create_batches(view_no=0))) != \
view_change_digest(create_view_change(initial_view_no=1, stable_cp=100, batches=create_batches(view_no=1)))
assert view_change_digest(create_view_change(initial_view_no=0, stable_cp=100, batches=batches)) == \
view_change_digest(create_view_change(initial_view_no=0, stable_cp=100, batches=batches))
def test_non_primary_responds_to_view_change_message_with_view_change_ack_to_new_primary(
some_item, other_item, validators, primary, view_change_service,
initial_view_no, view_change_message):
next_view_no = initial_view_no + 1
non_primary_name = some_item(validators, exclude=[primary(next_view_no)])
service = view_change_service(non_primary_name)
service.start_view_change()
service._network.sent_messages.clear()
vc = view_change_message(next_view_no)
frm = other_item(validators, exclude=[non_primary_name])
service._network.process_incoming(vc, frm)
assert len(service._network.sent_messages) == 1
msg, dst = service._network.sent_messages[0]
assert dst == service._data.primary_name
assert isinstance(msg, ViewChangeAck)
assert msg.viewNo == vc.viewNo
assert msg.name == frm
assert msg.digest == view_change_digest(vc)
def create_view_change_acks(vc, vc_frm, senders):
digest = view_change_digest(vc)
senders = [name for name in senders if name != vc_frm]
return [(ViewChangeAck(viewNo=vc.viewNo, name=vc_frm,
digest=digest), ack_frm) for ack_frm in senders]
def test_different_view_change_messages_have_different_digests(
view_change_message, random):
vc = view_change_message(random.integer(0, 10000))
other_vc = view_change_message(random.integer(0, 10000))
assert view_change_digest(vc) != view_change_digest(other_vc)
def test_view_change_digest_is_256_bit_hexdigest(view_change_message, random):
vc = view_change_message(random.integer(0, 10000))
digest = view_change_digest(vc)
assert isinstance(digest, str)
assert len(digest) == 64
assert all(v in string.hexdigits for v in digest)
