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trezor-firmware/trezorlib/mapping.py
2018-08-13 18:22:19 +02:00

63 lines
1.8 KiB
Python

# This file is part of the Trezor project.
#
# Copyright (C) 2012-2018 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
from . import messages
map_type_to_class = {}
map_class_to_type = {}
def build_map():
for msg_name in dir(messages.MessageType):
if msg_name.startswith("__"):
continue
try:
msg_class = getattr(messages, msg_name)
except AttributeError:
raise ValueError(
"Implementation of protobuf message '%s' is missing" % msg_name
)
if msg_class.MESSAGE_WIRE_TYPE != getattr(messages.MessageType, msg_name):
raise ValueError(
"Inconsistent wire type and MessageType record for '%s'" % msg_class
)
register_message(msg_class)
def register_message(msg_class):
if msg_class.MESSAGE_WIRE_TYPE in map_type_to_class:
raise Exception(
"Message for wire type %s is already registered by %s"
% (msg_class.MESSAGE_WIRE_TYPE, get_class(msg_class.MESSAGE_WIRE_TYPE))
)
map_class_to_type[msg_class] = msg_class.MESSAGE_WIRE_TYPE
map_type_to_class[msg_class.MESSAGE_WIRE_TYPE] = msg_class
def get_type(msg):
return map_class_to_type[msg.__class__]
def get_class(t):
return map_type_to_class[t]
build_map()