def casper_setup_block(chain,
state=None,
timestamp=None,
coinbase='\x35' * 20,
extra_data='moo ha ha says the laughing cow.'):
state = state or chain.state
blk = Block(BlockHeader())
now = timestamp or chain.time()
prev_blknumber = call_casper(state, 'getBlockNumber')
blk.header.number = prev_blknumber + 1
blk.header.difficulty = 1
blk.header.gas_limit = call_casper(state, 'getGasLimit')
blk.header.timestamp = max(now, state.prev_headers[0].timestamp + 1)
blk.header.prevhash = apply_const_message(
state,
sender=casper_config['METROPOLIS_ENTRY_POINT'],
to=casper_config['METROPOLIS_BLOCKHASH_STORE'],
data=utils.encode_int32(prev_blknumber))
blk.header.coinbase = coinbase
blk.header.extra_data = extra_data
blk.header.bloom = 0
blk.uncles = []
initialize(state, blk)
for tx in get_dunkle_candidates(chain, state):
assert apply_transaction(state, tx)
blk.transactions.append(tx)
log_bc.info('Block set up with number %d and prevhash %s, %d dunkles' %
(blk.header.number, utils.encode_hex(
blk.header.prevhash), len(blk.transactions)))
return blk
def add(self, item: Block) -> None:
if item.get_marker() in self.buffer:
self.buffer[item.get_marker()].hashes.update(item.hashes)
else:
self.buffer[item.get_marker()] = item
if len(self.buffer) > self.size:
self.buffer.popitem(False)
self.metric.observe(len(self.buffer))
def get_latest_block(self, timeout=0) -> (Block, Block):
r = requests.get(self.url.format(self.token), timeout=timeout)
if r.status_code != 200:
raise APIException(r.json())
r_json = r.json()["result"]
id = int(r_json["number"], 16)
ancestor = Block(id-1, [uncle[2:] for uncle in r_json["uncles"]])
ancestor.hashes.add(r_json["parentHash"][2:])
return Block(id, [r_json["hash"][2:]]), ancestor
def get_latest_block(self, timeout=0) -> (Block, Block):
r = requests.post(self.url.format(self.token), json={
"jsonrpc": "2.0",
"method": "eth_getBlockByNumber",
"params": ["latest", False],
"id": "1",
}, timeout=timeout)
if r.status_code != 200:
raise APIException(r.json())
r_json = r.json()["result"]
id = int(r_json["number"], 16)
ancestor = Block(id-1, [uncle[2:] for uncle in r_json["uncles"]])
ancestor.hashes.add(r_json["parentHash"][2:])
return Block(id, [r_json["hash"][2:]]), ancestor
def mk_block_from_prevstate(chain, state=None, timestamp=None,
coinbase=b'\x35' * 20, extra_data='moo ha ha says the laughing cow.'):
state = state or chain.state
blk = Block(BlockHeader())
now = timestamp or chain.time()
blk.header.number = state.prev_headers[0].number + 1
blk.header.difficulty = calc_difficulty(
state.prev_headers[0], now, chain.config)
blk.header.gas_limit = calc_gaslimit(state.prev_headers[0], chain.config)
blk.header.timestamp = max(now, state.prev_headers[0].timestamp + 1)
blk.header.prevhash = state.prev_headers[0].hash
blk.header.coinbase = coinbase
blk.header.extra_data = extra_data
blk.header.bloom = 0
blk.transactions = []
return blk
def __init__(self, app):
super(ChainServiceMock, self).__init__(app)
self.on_new_head_cbs = []
self.transaction_queue = TransactionQueue()
self.is_syncing = False
self.mined_block = None
self.block_mined_event = Event()
self.head_candidate = Block(BlockHeader(difficulty=DIFFICULTY),
db=DB())
def block_from_genesis_declaration(genesis_data, env):
h = BlockHeader(nonce=parse_as_bin(genesis_data["nonce"]),
difficulty=parse_as_int(genesis_data["difficulty"]),
mixhash=parse_as_bin(genesis_data.get("mixhash", genesis_data.get("mixHash", "0"*64))),
coinbase=parse_as_bin(genesis_data["coinbase"]),
bloom=parse_as_int(genesis_data.get("bloom", "0")),
timestamp=parse_as_int(genesis_data["timestamp"]),
prevhash=parse_as_bin(genesis_data["parentHash"]),
extra_data=parse_as_bin(genesis_data["extraData"]),
gas_used=parse_as_int(genesis_data.get("gasUsed", "0")),
gas_limit=parse_as_int(genesis_data["gasLimit"]))
return Block(h, [], [])
def __init__(self, genesis):
env = Env(EphemDB(), konfig)
if not genesis:
genesis = mk_genesis_data(env)
if 'config' in genesis:
if 'homesteadBlock' in genesis['config']:
env.config['HOMESTEAD_FORK_BLKNUM'] = int(genesis['config']['homesteadBlock'])
env.config['DAO_FORK_BLKNUM'] = int(genesis['config']['homesteadBlock'])
env.config['ANTI_DOS_FORK_BLKNUM'] = int(genesis['config']['homesteadBlock'])
env.config['SPURIOUS_DRAGON_FORK_BLKNUM'] = int(genesis['config']['homesteadBlock'])
self.state = state_from_genesis_declaration(genesis, env)
initialize_genesis_keys(self.state, Block(self.state.prev_headers[0], [], []))
def run_block_test(params, config_overrides=None):
if config_overrides is None:
config_overrides = {}
env = Env(db.EphemDB())
genesis_decl = {}
for param in ("bloom", "timestamp", "nonce", "extraData", "gasLimit",
"coinbase", "difficulty", "parentHash", "mixHash",
"gasUsed"):
genesis_decl[param] = params["genesisBlockHeader"][param]
genesis_decl["alloc"] = params["pre"]
old_config = copy.deepcopy(env.config)
for k, v in config_overrides.items():
env.config[k] = v
# print('overrides', config_overrides)
s = state_from_genesis_declaration(genesis_decl, env, allow_empties=True)
initialize_genesis_keys(s, Block(s.prev_headers[0], [], []))
c = chain.Chain(genesis=s, localtime=2**99)
# print('h', encode_hex(c.state.prev_headers[0].state_root))
# print(c.state.to_dict())
# print(params["pre"])
assert c.state.env == env
assert c.state.prev_headers[0].state_root == safe_decode(
params["genesisBlockHeader"]["stateRoot"]), (
encode_hex(c.state.prev_headers[0].state_root),
params["genesisBlockHeader"]["stateRoot"])
assert c.state.trie.root_hash == safe_decode(
params["genesisBlockHeader"]["stateRoot"])
assert c.state.prev_headers[0].hash == safe_decode(
params["genesisBlockHeader"]["hash"])
#print('std', c.state.to_dict())
for blk in params["blocks"]:
if 'blockHeader' not in blk:
success = True
try:
rlpdata = safe_decode(blk["rlp"][2:])
success = c.add_block(rlp.decode(rlpdata, Block))
except (ValueError, TypeError, AttributeError, VerificationFailed,
DecodingError, DeserializationError, InvalidTransaction,
InvalidNonce, KeyError) as e:
success = False
assert not success
else:
rlpdata = safe_decode(blk["rlp"][2:])
assert c.add_block(rlp.decode(rlpdata, Block))
env.config = old_config
def mk_block_from_prevstate(chain,
state=None,
timestamp=None,
coinbase=b'\x35' * 20,
extra_data=b'moo ha ha says the laughing cow.'):
state = state or chain.state
now = timestamp or chain.time()
blk = Block(header=BlockHeader(
number=state.prev_headers[0].number + 1,
difficulty=calc_difficulty(state.prev_headers[0], now, chain.config),
gas_limit=calc_gaslimit(state.prev_headers[0], chain.config),
timestamp=max(now, state.prev_headers[0].timestamp + 1),
prevhash=state.prev_headers[0].hash,
coinbase=coinbase,
extra_data=extra_data,
bloom=0),
transactions=[])
return blk
def __init__(self,
genesis=None,
env=None,
coinbase=b'\x00' * 20,
new_head_cb=None,
reset_genesis=False,
localtime=None,
**kwargs):
self.env = env or Env()
# Initialize the state
if b'head_hash' in self.db: # new head tag
self.state = self.mk_poststate_of_blockhash(
self.db.get(b'head_hash'))
print('Initializing chain from saved head, #%d (%s)' %
(self.state.prev_headers[0].number,
encode_hex(self.state.prev_headers[0].hash)))
elif genesis is None:
raise Exception("Need genesis decl!")
elif isinstance(genesis, State):
assert env is None
self.state = genesis
self.env = self.state.env
print('Initializing chain from provided state')
elif "extraData" in genesis:
self.state = state_from_genesis_declaration(genesis, self.env)
reset_genesis = True
print('Initializing chain from provided genesis declaration')
elif "prev_headers" in genesis:
self.state = State.from_snapshot(genesis, self.env)
reset_genesis = True
print('Initializing chain from provided state snapshot, %d (%s)' %
(self.state.block_number,
encode_hex(self.state.prev_headers[0].hash[:8])))
else:
print('Initializing chain from new state based on alloc')
self.state = mk_basic_state(
genesis, {
"number":
kwargs.get('number', 0),
"gas_limit":
kwargs.get('gas_limit', 4712388),
"gas_used":
kwargs.get('gas_used', 0),
"timestamp":
kwargs.get('timestamp', 1467446877),
"difficulty":
kwargs.get('difficulty', 2**25),
"hash":
kwargs.get('prevhash', '00' * 32),
"uncles_hash":
kwargs.get('uncles_hash',
'0x' + encode_hex(BLANK_UNCLES_HASH))
}, self.env)
reset_genesis = True
assert self.env.db == self.state.db
initialize(self.state)
self.new_head_cb = new_head_cb
self.head_hash = self.state.prev_headers[0].hash
self.checkpoint_head_hash = b'\x00' * 32
self.db.put(b'cp_subtree_score' + b'\x00' * 32, 2 / 3.)
self.commit_logs = []
self.casper_address = self.config['CASPER_ADDRESS']
self.db.put(b'GENESIS_NUMBER', to_string(self.state.block_number))
assert self.state.block_number == self.state.prev_headers[0].number
if reset_genesis:
self.genesis = Block(self.state.prev_headers[0], [], [])
initialize_genesis_keys(self.state, self.genesis)
else:
self.genesis = self.get_block_by_number(0)
self.db.put(b'cp_subtree_score' + self.genesis.hash, 2 / 3.)
self.min_gasprice = kwargs.get('min_gasprice', 5 * 10**9)
self.coinbase = coinbase
self.extra_data = 'moo ha ha says the laughing cow.'
self.time_queue = []
self.parent_queue = {}
self.localtime = time.time() if localtime is None else localtime
def __init__(self,
genesis=None,
env=None,
new_head_cb=None,
reset_genesis=False,
localtime=None,
max_history=1000,
**kwargs):
self.env = env or Env()
# Initialize the state
if b'head_hash' in self.db: # new head tag
self.state = self.mk_poststate_of_blockhash(
self.db.get('head_hash'))
self.state.executing_on_head = True
print('Initializing chain from saved head, #%d (%s)' %
(self.state.prev_headers[0].number,
encode_hex(self.state.prev_headers[0].hash)))
elif genesis is None:
raise Exception("Need genesis decl!")
elif isinstance(genesis, State):
assert env is None
self.state = genesis
self.env = self.state.env
print('Initializing chain from provided state')
reset_genesis = True
elif "extraData" in genesis:
self.state = state_from_genesis_declaration(genesis,
self.env,
executing_on_head=True)
reset_genesis = True
print('Initializing chain from provided genesis declaration')
elif "prev_headers" in genesis:
self.state = State.from_snapshot(genesis,
self.env,
executing_on_head=True)
reset_genesis = True
print('Initializing chain from provided state snapshot, %d (%s)' %
(self.state.block_number,
encode_hex(self.state.prev_headers[0].hash[:8])))
elif isinstance(genesis, dict):
print('Initializing chain from new state based on alloc')
self.state = mk_basic_state(
genesis, {
"number":
kwargs.get('number', 0),
"gas_limit":
kwargs.get('gas_limit',
self.env.config['BLOCK_GAS_LIMIT']),
"gas_used":
kwargs.get('gas_used', 0),
"timestamp":
kwargs.get('timestamp', 1467446877),
"difficulty":
kwargs.get('difficulty', 2**25),
"hash":
kwargs.get('prevhash', '00' * 32),
"uncles_hash":
kwargs.get('uncles_hash',
'0x' + encode_hex(BLANK_UNCLES_HASH))
}, self.env)
reset_genesis = True
assert self.env.db == self.state.db
initialize(self.state)
self.new_head_cb = new_head_cb
if self.state.block_number == 0:
assert self.state.block_number == self.state.prev_headers[0].number
else:
assert self.state.block_number - 1 == self.state.prev_headers[
0].number
if reset_genesis:
if isinstance(self.state.prev_headers[0], FakeHeader):
header = self.state.prev_headers[0].to_block_header()
else:
header = self.state.prev_headers[0]
self.genesis = Block(header)
self.state.prev_headers[0] = header
initialize_genesis_keys(self.state, self.genesis)
else:
self.genesis = self.get_block_by_number(0)
self.head_hash = self.state.prev_headers[0].hash
self.time_queue = []
self.parent_queue = {}
self.localtime = time.time() if localtime is None else localtime
self.max_history = max_history
def to_block(self):
"""Convert the transient block to a :class:`ethereum.blocks.Block`"""
return Block(self.header, transactions=self.transactions, uncles=self.uncles)
