def persist_header(self, header):
"""
:returns: iterable of headers newly on the canonical chain
"""
if header.parent_hash != GENESIS_PARENT_HASH and not self.header_exists(header.parent_hash):
raise ParentNotFound(
"Cannot persist block header ({}) with unknown parent ({})".format(
encode_hex(header.hash), encode_hex(header.parent_hash)))
self.db.set(
header.hash,
rlp.encode(header),
)
if header.parent_hash == GENESIS_PARENT_HASH:
score = header.difficulty
else:
score = self.get_score(header.parent_hash) + header.difficulty
self.db.set(
make_block_hash_to_score_lookup_key(header.hash),
rlp.encode(score, sedes=rlp.sedes.big_endian_int))
try:
head_score = self.get_score(self.get_canonical_head().hash)
except CanonicalHeadNotFound:
new_headers = self._set_as_canonical_chain_head(header)
else:
if score > head_score:
new_headers = self._set_as_canonical_chain_head(header)
else:
new_headers = []
return new_headers
def persist_header(self, header: BlockHeader) -> Tuple[BlockHeader, ...]:
"""
Returns iterable of headers newly on the canonical chain
"""
is_genesis = header.parent_hash == GENESIS_PARENT_HASH
if not is_genesis and not self.header_exists(header.parent_hash):
raise ParentNotFound(
"Cannot persist block header ({}) with unknown parent ({})".
format(encode_hex(header.hash),
encode_hex(header.parent_hash)))
self.db.set(
header.hash,
rlp.encode(header),
)
if is_genesis:
score = header.difficulty
else:
score = self.get_score(header.parent_hash) + header.difficulty
self.db.set(
SchemaV1.make_block_hash_to_score_lookup_key(header.hash),
rlp.encode(score, sedes=rlp.sedes.big_endian_int),
)
try:
head_score = self.get_score(self.get_canonical_head().hash)
except CanonicalHeadNotFound:
new_headers = self._set_as_canonical_chain_head(header)
else:
if score > head_score:
new_headers = self._set_as_canonical_chain_head(header)
else:
new_headers = tuple()
return new_headers