def test_receive_chain_accept(self):
n1 = None
try:
blk = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {
'foo': 'bar'
}
}
dct = {'blocks': [blk]}
chain = Chain.from_dict(dct)
node_id = 'blah'
backend = MockFileBackend(chains={node_id: chain})
n1 = Node.start(node_id=node_id, backend=backend)
p1 = n1.proxy()
chain2 = copy.deepcopy(chain)
blk2 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {
'a': 'b'
}
}
chain2.add_block(Block.from_dict(blk2))
res = p1.receive_chain(chain2).get()
self.assertEqual(res, ACCEPTED)
self.assertEqual(p1.chain.get(), chain2)
finally:
n1.stop()
def test_share_chain_rejected(self):
try:
blk = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {
'foo': 'bar'
}
}
blk2 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {
'woo': 'hoo'
}
}
dct = {'blocks': [blk, blk2]}
chain = Chain.from_dict(dct)
node_id = 'blah'
backend = MockFileBackend(chains={node_id: chain})
n1 = Node.start(node_id=node_id, backend=backend)
p1 = n1.proxy()
short_chain = Chain.from_dict({'blocks': [blk]})
blk3 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {
'p': 'b'
}
}
dct2 = {'blocks': [blk, blk3]}
chain2 = Chain.from_dict(dct2)
n2 = Node.start(node_id='2',
backend=MockFileBackend({'2': short_chain}))
n3 = Node.start(node_id='3',
backend=MockFileBackend({'3': chain2}))
n4 = Node.start(node_id='4',
backend=MockFileBackend({'4': chain2}))
p2 = n2.proxy()
p3 = n3.proxy()
p4 = n4.proxy()
p1.register_peer(p2)
p1.register_peer(p3)
p1.register_peer(p4)
p1.share_chain().get()
self.assertEqual(p1.chain.get(), short_chain)
self.assertEqual(p2.chain.get(), short_chain)
self.assertEqual(p3.chain.get(), chain2)
self.assertEqual(p4.chain.get(), chain2)
finally:
n1.stop()
n2.stop()
n3.stop()
n4.stop()
def test_from_dict_to_dict(self):
dct = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {'foo': 'bar'}
}
b = Block.from_dict(dct)
dct['hash'] = b.hash
self.assertEqual(b.to_dict(), dct)
def test_json(self):
dct = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {'foo': 'bar'}
}
b = Block.from_json(json.dumps(dct))
dct['hash'] = b.hash
self.maxDiff = None
self.assertEqual(json.loads(b.to_json()), dct)
def test_load_chain(self):
chain = Chain(
blocks=[Block(
timestamp=datetime(2017, 8, 9, 10, 11, 12, tzinfo=pytz.UTC),
prev_hash='xxyy',
data={'foo': 'bar'}
)])
json.dump(chain.to_dict(), open(os.path.join(FileBackend.FILE_DIR, 'n2.json'), 'w'))
c2 = self.backend.load_chain('n2')
self.assertEqual(c2.to_dict(), chain.to_dict())
def test_save_chain(self):
chain = Chain(
blocks=[Block(
timestamp=datetime(2017, 8, 9, 10, 11, 12, tzinfo=pytz.UTC),
prev_hash='abcd',
data={'foo': 'bar'}
)])
self.backend.save_chain(chain, 'n1')
d = json.load(open(os.path.join(FileBackend.FILE_DIR, 'n1.json')))
self.assertEqual(d, chain.to_dict())
def mine_block(self):
self.logger.debug('mining now')
t = pytz.UTC.localize(datetime.utcnow())
data = json.dumps(
{k: v.to_dict()
for k, v in self.pending_transactions.iteritems()})
new_block = Block(timestamp=t,
prev_hash=self.chain.latest_hash(),
data=data)
self.chain.add_block(new_block)
self.share_chain()
def test_add_block(self):
blk = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {'foo': 'bar'}
}
dct = {
'blocks': [blk]
}
chain = Chain.from_dict(dct)
b2 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {'on': 'point'}
}
chain.add_block(Block.from_dict(b2))
self.assertEqual(
chain.to_dict(),
{'blocks': [Block.from_dict(blk).to_dict(), Block.from_dict(b2).to_dict()]}
)
# prev_hash doesn't match last hash - should fail
b3 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {'some': 'thing'}
}
self.assertRaises(ValueError, chain.add_block, Block.from_dict(b3))
def test_receive_chain_reject_same_length_different_blocks(self):
n1 = None
try:
blk = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {
'foo': 'bar'
}
}
blk2 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {
'woo': 'hoo'
}
}
dct = {'blocks': [blk, blk2]}
chain = Chain.from_dict(dct)
node_id = 'blah'
backend = MockFileBackend(chains={node_id: chain})
n1 = Node.start(node_id=node_id, backend=backend)
p1 = n1.proxy()
blk3 = {
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': Block.from_dict(blk).hash,
'data': {
'p': 'b'
}
}
dct2 = {'blocks': [blk, blk3]}
chain2 = Chain.from_dict(dct2)
res = p1.receive_chain(chain2).get()
self.assertEqual(res, REJECTED)
self.assertEqual(p1.chain.get(), chain)
finally:
n1.stop()
def test_latest_hash(self):
block_dicts = [
{
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '1234',
'data': {'foo': 'bar'}
},
{
'timestamp': '2017-01-02T03:04:05.000123Z',
'prev_hash': '5678',
'data': {'on': 'point'}
}
]
chain = Chain.from_dict(
{'blocks': block_dicts}
)
self.assertEqual(chain.latest_hash(), Block.from_dict(block_dicts[-1]).hash)
chain2 = Chain(blocks=[])
self.assertIsNone(chain2.latest_hash())