def get_example_genesis_block():
return Block.deserialize(computer(
"""000000000000000000000000000000000000000000000000000000000000000000008278968af4bd613aa24a5ccd5280211b3101e3"""
"""ff62621bb11500509d1bbe2a956046240b0100000000000000000000000000000000000000000000000000000000000000000000d7"""
"""38f2c472180cb401f650b12be96ec25bfd9b4e9908c6c9089d9bf26401646f87000000000000000000000000000000000000000000"""
"""0000000000000000000000077a14cfbe21d47f367f23f9a464c765541b1b07bef9f5a95901e0bffe3a1a2f01000100000000000000"""
"""000000000000000000000000000000000000000000000000000000000001000000000001000000012a05f200027878787878787878"""
"""7878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878"""
"""787878"""))
def handle_mined_block(self, block: Block) -> None:
self.coinstate = self.coinstate.add_block(block, int(time()))
with open(Path('chain') / block_filename(block), 'wb') as f:
f.write(block.serialize())
self.send_message("found_block", block_filename(block))
self.send_message("balance", self.get_balance())
self.thread.local_peer.chain_manager.set_coinstate(self.coinstate)
self.thread.local_peer.network_manager.broadcast_block(block)
def _read_chain_from_disk(max_height):
coinstate = CoinState.zero()
for file_path in sorted(CHAIN_TESTDATA_PATH.iterdir()):
height = int(file_path.name.split("-")[0])
if height > max_height:
return coinstate
block = Block.stream_deserialize(open(file_path, 'rb'))
coinstate = coinstate.add_block_no_validation(block)
return coinstate
def read_chain_from_disk():
print("Reading chain from disk")
coinstate = CoinState.zero()
for filename in sorted(os.listdir('chain')):
height = int(filename.split("-")[0])
if height % 1000 == 0:
print(filename)
block = Block.stream_deserialize(open(Path('chain') / filename, 'rb'))
coinstate = coinstate.add_block_no_validation(block)
return coinstate
def handle_scrypt_output_message(self, miner_id: int, data: bytes) -> None:
summary_hash: bytes = data
self.increment_hash_counter()
summary, current_height, transactions = self.mining_args[miner_id]
evidence = construct_pow_evidence_after_scrypt(summary_hash,
self.coinstate, summary,
current_height,
transactions)
block = Block(BlockHeader(summary, evidence), transactions)
if block.hash() >= block.target:
# we didn't mine the block
return
self.network_thread.local_peer.chain_manager.set_coinstate(
self.coinstate)
self.network_thread.local_peer.network_manager.broadcast_block(block)
self.coinstate = self.coinstate.add_block(block, int(time()))
# Originally there was a disk write in this spot. During testing of the chain.cache changes,
# it was found there is a race condition between the mining thread and the networking thread.
# Better to skip the write here and just let the networking thread do it.
print(f"miner {miner_id} found block: {block_filename(block)}")
# get new public key for miner
self.public_key = self.wallet.get_annotated_public_key(
"reserved for potentially mined block")
save_wallet(self.wallet)
self.balance = self.wallet.get_balance(
self.coinstate) / Decimal(SASHIMI_PER_COIN)
def _read_chain_from_disk(max_height):
# the requirement to run these tests from an environment that has access to the real blockchain is hard-coded (for
# now)
coinstate = CoinState.zero()
for filename in sorted(os.listdir('chain')):
height = int(filename.split("-")[0])
if height > max_height:
return coinstate
block = Block.stream_deserialize(open(Path('chain') / filename, 'rb'))
coinstate = coinstate.add_block_no_validation(block)
return coinstate
def read_chain_from_disk():
print("Reading chain from disk")
coinstate = CoinState.zero()
for filename in sorted(os.listdir('chain')):
height = int(filename.split("-")[0])
if height % 1000 == 0:
print(filename)
try:
block = Block.stream_deserialize(open(Path('chain') / filename, 'rb'))
except Exception as e:
raise Exception("Corrupted block on disk: %s" % filename) from e
coinstate = coinstate.add_block_no_validation(block)
return coinstate
def read_chain_from_disk() -> CoinState:
if os.path.isfile('chain.cache'):
print("Reading cached chain")
with open('chain.cache', 'rb') as file:
coinstate = CoinState.load(lambda: pickle.load(file))
else:
coinstate = CoinState.zero()
rewrite = False
if os.path.isdir('chain'):
# the code below is no longer needed by normal users, but some old testcases still rely on it:
for filename in sorted(os.listdir('chain')):
(height_str, hash_str) = filename.split("-")
(height, hash) = (int(height_str), computer(hash_str))
if hash not in coinstate.block_by_hash:
if height % 1000 == 0:
print(filename)
if os.path.getsize(f"chain/{filename}") == 0:
print("Stopping at empty block file: %s" % filename)
break
with open(Path("chain") / filename, 'rb') as f:
try:
block = Block.stream_deserialize(f)
except Exception as e:
raise Exception("Corrupted block on disk: %s" % filename) from e
try:
coinstate = coinstate.add_block_no_validation(block)
except Exception:
print("Failed to add block at height=%d, previous_hash=%s"
% (block.height, human(block.header.summary.previous_block_hash)))
break
rewrite = True
if rewrite:
DiskInterface().write_chain_cache_to_disk(coinstate)
return coinstate
def test_validate_block_by_itself_invalid_coinbase_transaction():
coinstate = CoinState.empty()
transactions = [
Transaction(inputs=[
Input(
OutputReference(b'x' * 32, 1),
SECP256k1Signature(b'y' * 64),
)
],
outputs=[Output(1, example_public_key)])
]
summary = construct_minable_summary(coinstate, transactions, 1615209942,
39)
evidence = construct_pow_evidence(coinstate, summary, 0, transactions)
block = Block(BlockHeader(summary, evidence), transactions)
with pytest.raises(ValidateTransactionError, match=".*thin air.*"):
validate_block_by_itself(block, 1615209942)
def test_block_serialization():
block = Block(
header=BlockHeader(
summary=example_block_summary,
pow_evidence=example_pow_evidence,
),
transactions=[
Transaction(
inputs=[
Input(output_reference=OutputReference(b"b" * 32, 1234),
signature=SECP256k1Signature(b"b" * 64))
],
outputs=[
Output(value=1582,
public_key=SECP256k1PublicKey(b"g" * 64))
],
)
] * 2,
)
serialize_and_deserialize(block)
def broadcast_block(self, block: Block) -> None:
self.local_peer.logger.info("%15s ChainManager.broadcast_block(%s)" %
("", human(block.hash())))
self.broadcast_message(DataMessage(DATA_BLOCK, block))
def read_chain_from_disk() -> CoinState:
if os.path.isfile('chain.cache'):
print("Reading cached chain")
with open('chain.cache', 'rb') as file:
coinstate = CoinState.load(lambda: pickle.load(file))
else:
try:
print("Pre-download blockchain from trusted source to 'chain.zip'")
with urllib.request.urlopen(TRUSTED_BLOCKCHAIN_ZIP) as resp:
with open('chain.zip', 'wb') as outfile:
outfile.write(resp.read())
print("Reading initial chain from zipfile")
coinstate = CoinState.zero()
with zipfile.ZipFile('chain.zip') as zip:
for entry in zip.infolist():
if not entry.is_dir():
filename = entry.filename.split('/')[1]
height = int(filename.split("-")[0])
if height % 1000 == 0:
print(filename)
data = zip.read(entry)
block = Block.stream_deserialize(BytesIO(data))
coinstate = coinstate.add_block_no_validation(block)
except Exception:
print(
"Error reading zip file. We'll start with an empty blockchain instead."
+ traceback.format_exc())
coinstate = CoinState.zero()
rewrite = False
if os.path.isdir('chain'):
# the code below is no longer needed by normal users, but some old testcases still rely on it:
for filename in sorted(os.listdir('chain')):
(height_str, hash_str) = filename.split("-")
(height, hash) = (int(height_str), computer(hash_str))
if hash not in coinstate.block_by_hash:
if height % 1000 == 0:
print(filename)
if os.path.getsize(f"chain/{filename}") == 0:
print("Stopping at empty block file: %s" % filename)
break
with open(Path("chain") / filename, 'rb') as f:
try:
block = Block.stream_deserialize(f)
except Exception as e:
raise Exception("Corrupted block on disk: %s" %
filename) from e
try:
coinstate = coinstate.add_block_no_validation(block)
except Exception:
print(
"Failed to add block at height=%d, previous_hash=%s"
%
(block.height,
human(block.header.summary.previous_block_hash)))
break
rewrite = True
if rewrite:
DiskInterface().write_chain_cache_to_disk(coinstate)
return coinstate
def block_filename(block: Block) -> str:
return "%08d-%s" % (block.height, human(block.hash()))
