def _remove_transaction_from_canonical_chain(
db: BaseDB, transaction_hash: Hash32) -> None:
"""
Removes the transaction specified by the given hash from the canonical
chain.
"""
db.delete(
SchemaV1.make_transaction_hash_to_block_lookup_key(
transaction_hash))
def get_transaction_index(self, transaction_hash: Hash32) -> Tuple[BlockNumber, int]:
key = SchemaV1.make_transaction_hash_to_block_lookup_key(transaction_hash)
try:
encoded_key = self.db[key]
except KeyError:
raise TransactionNotFound(
f"Transaction {encode_hex(transaction_hash)} not found in canonical chain"
)
transaction_key = rlp.decode(encoded_key, sedes=TransactionKey)
return (transaction_key.block_number, transaction_key.index)
def _add_transaction_to_canonical_chain(self, transaction_hash: Hash32,
block_header: BlockHeader,
index: int) -> None:
"""
:param bytes transaction_hash: the hash of the transaction to add the lookup for
:param block_header: The header of the block with the txn that is in the canonical chain
:param int index: the position of the transaction in the block
- add lookup from transaction hash to the block number and index that the body is stored at
- remove transaction hash to body lookup in the pending pool
"""
transaction_key = TransactionKey(block_header.block_number, index)
self.db.set(
SchemaV1.make_transaction_hash_to_block_lookup_key(
transaction_hash),
rlp.encode(transaction_key),
)
def get_transaction_index(self, transaction_hash: Hash32) -> Tuple[BlockNumber, int]:
"""
Returns a 2-tuple of (block_number, transaction_index) indicating which
block the given transaction can be found in and at what index in the
block transactions.
Raises TransactionNotFound if the transaction_hash is not found in the
canonical chain.
"""
key = SchemaV1.make_transaction_hash_to_block_lookup_key(transaction_hash)
try:
encoded_key = self.db[key]
except KeyError:
raise TransactionNotFound(
"Transaction {} not found in canonical chain".format(encode_hex(transaction_hash)))
transaction_key = rlp.decode(encoded_key, sedes=TransactionKey)
return (transaction_key.block_number, transaction_key.index)
