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trezor-firmware/trezorlib/transport_pipe.py
2016-05-26 17:20:44 +02:00

61 lines
1.9 KiB
Python

from __future__ import print_function
import os
from select import select
from .transport import Transport
"""PipeTransport implements fake wire transport over local named pipe.
Use this transport for talking with trezor simulator."""
class PipeTransport(Transport):
def __init__(self, device, is_device, *args, **kwargs):
self.is_device = is_device # Set True if act as device
super(PipeTransport, self).__init__(device, *args, **kwargs)
def _open(self):
if self.is_device:
self.filename_read = self.device+'.to'
self.filename_write = self.device+'.from'
os.mkfifo(self.filename_read, 0o600)
os.mkfifo(self.filename_write, 0o600)
else:
self.filename_read = self.device+'.from'
self.filename_write = self.device+'.to'
if not os.path.exists(self.filename_write):
raise Exception("Not connected")
self.write_fd = os.open(self.filename_write, os.O_RDWR)#|os.O_NONBLOCK)
self.write_f = os.fdopen(self.write_fd, 'w+b', 0)
self.read_fd = os.open(self.filename_read, os.O_RDWR)#|os.O_NONBLOCK)
self.read_f = os.fdopen(self.read_fd, 'rb', 0)
def _close(self):
self.read_f.close()
self.write_f.close()
if self.is_device:
os.unlink(self.filename_read)
os.unlink(self.filename_write)
def ready_to_read(self):
rlist, _, _ = select([self.read_f], [], [], 0)
return len(rlist) > 0
def _write(self, msg, protobuf_msg):
try:
self.write_f.write(msg)
self.write_f.flush()
except OSError:
print("Error while writing to socket")
raise
def _read(self):
try:
(msg_type, datalen) = self._read_headers(self.read_f)
return (msg_type, self.read_f.read(datalen))
except IOError:
print("Failed to read from device")
raise