def __init__(self,
parent,
proposer,
ts,
sigs,
main_chain_ref,
nb_notaries,
nb_shards,
sample=9,
min_sample=3,
base_ts_diff=1,
skip_ts_diff=6):
self.contents = os.urandom(32) if parent else (b'\x10' * 32)
self.parent_hash = parent.hash if parent else (b'\x11' * 32)
self.hash = sha3(self.parent_hash + self.contents)
self.ts = ts
self.sigs = sigs
self.number = parent.number + 1 if parent else 0
self.main_chain_ref = main_chain_ref.hash if main_chain_ref else parent.main_chain_ref
if parent:
i = parent.child_proposers.index(proposer)
assert self.ts >= parent.ts + base_ts_diff + i * skip_ts_diff
assert len(sigs) >= parent.notary_req
for sig in sigs:
assert sig.target_hash == self.parent_hash
# Calculate child proposers
v = hash_to_int(sha3(self.contents))
self.child_proposers = []
while v > 0:
self.child_proposers.append(v % nb_notaries)
v //= nb_notaries
# Calculate notaries
first = parent and proposer == parent.child_proposers[0]
self.notary_req = 0 if first else min_sample
v = hash_to_int(sha3(self.contents + b':n'))
self.notaries = []
for i in range(sample if first else sample):
self.notaries.append(v % nb_notaries)
v //= nb_notaries
# Calculate shard proposers
v = hash_to_int(sha3(self.contents + b':s'))
self.shard_proposers = []
for i in range(nb_shards):
self.shard_proposers.append(v % nb_notaries)
v //= nb_notaries
def __init__(self, parent, pownonce, ts, powdiff):
self.parent_hash = parent.hash if parent else (b'\x00' * 32)
assert isinstance(self.parent_hash, bytes)
self.hash = sha3(self.parent_hash + str(pownonce).encode('utf-8'))
self.ts = ts
if parent:
assert checkpow(parent.pownonce, pownonce, powdiff)
assert self.ts >= parent.ts
self.pownonce = pownonce
self.number = 0 if parent is None else parent.number + 1
def __init__(self, shard_id, parent, proposer, beacon_ref, ts):
self.proposer = proposer
self.parent_hash = parent.hash if parent else (bytes([40 + shard_id]) * 32)
self.hash = sha3(self.parent_hash + str(self.proposer).encode('utf-8') + beacon_ref.hash)
self.ts = ts
self.shard_id = shard_id
self.number = parent.number + 1 if parent else 0
self.beacon_ref = beacon_ref.hash
if parent:
assert self.shard_id == parent.shard_id
assert self.proposer == beacon_ref.shard_proposers[self.shard_id]
assert self.ts >= parent.ts
assert self.ts >= beacon_ref.ts