def _get_canonical_head_root(db: DatabaseAPI) -> Hash32:
try:
canonical_head_root = db[
SchemaV1.make_canonical_head_root_lookup_key()]
except KeyError:
raise CanonicalHeadNotFound("No canonical head set for this chain")
return canonical_head_root
def _get_canonical_head(cls, db: BaseDB) -> BaseBeaconBlock:
try:
canonical_head_hash = db[
SchemaV1.make_canonical_head_hash_lookup_key()]
except KeyError:
raise CanonicalHeadNotFound("No canonical head set for this chain")
return cls._get_block_by_hash(db, canonical_head_hash)
def _get_canonical_head(cls, db: DatabaseAPI) -> BlockHeaderAPI:
try:
canonical_head_hash = db[
SchemaV1.make_canonical_head_hash_lookup_key()]
except KeyError:
raise CanonicalHeadNotFound("No canonical head set for this chain")
return cls._get_block_header_by_hash(db, Hash32(canonical_head_hash))
def _get_finalized_head(cls,
db: BaseDB,
block_class: Type[BaseBeaconBlock]) -> BaseBeaconBlock:
try:
finalized_head_root = db[SchemaV1.make_finalized_head_root_lookup_key()]
except KeyError:
raise CanonicalHeadNotFound("No finalized head set for this chain")
return cls._get_block_by_root(db, Hash32(finalized_head_root), block_class)
def get_canonical_head(self) -> BlockHeader:
"""
Returns the current block header at the head of the chain.
"""
try:
canonical_head_hash = self.db[
SchemaV1.make_canonical_head_hash_lookup_key()]
except KeyError:
raise CanonicalHeadNotFound("No canonical head set for this chain")
return self.get_block_header_by_hash(canonical_head_hash)
def _get_canonical_head_hash(cls, db: DatabaseAPI) -> Hash32:
try:
return Hash32(db[SchemaV1.make_canonical_head_hash_lookup_key()])
except KeyError:
raise CanonicalHeadNotFound("No canonical head set for this chain")