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legacy_transactions.py
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legacy_transactions.py
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import itertools
from typing import (
Dict,
)
from eth_rlp import (
HashableRLP,
)
from eth_utils.curried import (
apply_formatters_to_dict,
)
from eth_utils.toolz import (
curry,
dissoc,
merge,
partial,
pipe,
)
import rlp
from rlp.sedes import (
Binary,
big_endian_int,
binary,
)
from .transaction_utils import (
set_transaction_type_if_needed,
)
from .typed_transactions import (
TypedTransaction,
)
from .validation import (
LEGACY_TRANSACTION_FORMATTERS,
LEGACY_TRANSACTION_VALID_VALUES,
)
def serializable_unsigned_transaction_from_dict(transaction_dict, blobs=None):
transaction_dict = set_transaction_type_if_needed(transaction_dict)
if "type" in transaction_dict:
# We delegate to TypedTransaction, which will carry out validation & formatting.
return TypedTransaction.from_dict(transaction_dict, blobs=blobs)
if blobs is not None:
# sanity check, blobs should never get past typed transactions check above
raise TypeError("Blob data is not supported for legacy transactions.")
assert_valid_fields(transaction_dict)
filled_transaction = pipe(
transaction_dict,
dict,
partial(merge, TRANSACTION_DEFAULTS),
chain_id_to_v,
apply_formatters_to_dict(LEGACY_TRANSACTION_FORMATTERS),
)
if "v" in filled_transaction:
serializer = Transaction
else:
serializer = UnsignedTransaction
return serializer.from_dict(filled_transaction)
def encode_transaction(unsigned_transaction, vrs):
(v, r, s) = vrs
chain_naive_transaction = dissoc(unsigned_transaction.as_dict(), "v", "r", "s")
if isinstance(unsigned_transaction, TypedTransaction):
# Typed transaction have their own encoding format,
# so we must delegate the encoding.
chain_naive_transaction["v"] = v
chain_naive_transaction["r"] = r
chain_naive_transaction["s"] = s
blob_data = unsigned_transaction.blob_data
signed_typed_transaction = TypedTransaction.from_dict(
chain_naive_transaction,
blobs=[blob.as_bytes() for blob in blob_data.blobs] if blob_data else None,
)
return signed_typed_transaction.encode()
signed_transaction = Transaction(v=v, r=r, s=s, **chain_naive_transaction)
return rlp.encode(signed_transaction)
TRANSACTION_DEFAULTS = {
"to": b"",
"value": 0,
"data": b"",
"chainId": None,
}
ALLOWED_TRANSACTION_KEYS = {
"nonce",
"gasPrice",
"gas",
"to",
"value",
"data",
# set chainId to None if you want a transaction that can be replayed across networks
"chainId",
}
REQUIRED_TRANSACTION_KEYS = ALLOWED_TRANSACTION_KEYS.difference(
TRANSACTION_DEFAULTS.keys()
)
def assert_valid_fields(transaction_dict):
# check if any keys are missing
missing_keys = REQUIRED_TRANSACTION_KEYS.difference(transaction_dict.keys())
if missing_keys:
raise TypeError(f"Transaction must include these fields: {repr(missing_keys)}")
# check if any extra keys were specified
superfluous_keys = set(transaction_dict.keys()).difference(ALLOWED_TRANSACTION_KEYS)
if superfluous_keys:
raise TypeError(
"Transaction must not include unrecognized fields: "
f"{repr(superfluous_keys)}"
)
# check for valid types in each field
valid_fields: Dict[str, bool]
valid_fields = apply_formatters_to_dict(
LEGACY_TRANSACTION_VALID_VALUES, transaction_dict
)
if not all(valid_fields.values()):
invalid = {
key: transaction_dict[key]
for key, valid in valid_fields.items()
if not valid
}
raise TypeError(f"Transaction had invalid fields: {repr(invalid)}")
def chain_id_to_v(transaction_dict):
# See EIP 155
chain_id = transaction_dict.pop("chainId")
if chain_id is None:
return transaction_dict
else:
return dict(transaction_dict, v=chain_id, r=0, s=0)
@curry
def fill_transaction_defaults(transaction):
return merge(TRANSACTION_DEFAULTS, transaction)
UNSIGNED_TRANSACTION_FIELDS = (
("nonce", big_endian_int),
("gasPrice", big_endian_int),
("gas", big_endian_int),
("to", Binary.fixed_length(20, allow_empty=True)),
("value", big_endian_int),
("data", binary),
)
class Transaction(HashableRLP):
fields = UNSIGNED_TRANSACTION_FIELDS + (
("v", big_endian_int),
("r", big_endian_int),
("s", big_endian_int),
)
class UnsignedTransaction(HashableRLP):
fields = UNSIGNED_TRANSACTION_FIELDS
ChainAwareUnsignedTransaction = Transaction
def strip_signature(txn):
unsigned_parts = itertools.islice(txn, len(UNSIGNED_TRANSACTION_FIELDS))
return list(unsigned_parts)
def vrs_from(transaction):
return (getattr(transaction, part) for part in "vrs")