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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# c1218/urlhandler/protocol_unix.py
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of the project nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
from __future__ import unicode_literals
import logging
import os
import socket
import time
import urlparse
from serial.serialutil import *
from serial.urlhandler.protocol_socket import SocketSerial
class UnixSerial(SocketSerial):
"""
Serial port implementation for unix sockets.
"""
def open(self):
self.logger = None
if self._port is None:
raise SerialException('Port must be configured before it can be used.')
if self._isOpen:
raise SerialException('Port is already open.')
try:
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
details = self.from_url(self.portstr)
socket_path = details['path']
if details['mode'] == 'server':
if os.path.exists(socket_path):
os.unlink(socket_path)
self._socket.bind(socket_path)
self._socket.listen(1)
self._server_socket = self._socket
self._socket = self._server_socket.accept()[0]
else:
self._socket.connect(socket_path)
except Exception as error:
self._socket = None
raise SerialException("Could not open port {0}: {1}".format(self.portstr, repr(error)))
self._socket.settimeout(2)
self._isOpen = True
def close(self):
if not self._isOpen:
return
if self._socket:
try:
self._socket.shutdown(socket.SHUT_RDWR)
self._socket.close()
except:
pass
self._socket = None
if hasattr(self, '_server_socket'):
socket_file = self._server_socket.getsockname()
try:
self._server_socket.shutdown(socket.SHUT_RDWR)
self._server_socket.close()
except:
pass
delattr(self, '_server_socket')
os.unlink(socket_file)
self._isOpen = False
def from_url(self, url):
details = {}
url = urlparse.urlparse(url)
options = urlparse.parse_qs(url.query)
options_get = lambda key, default: options.get(key, [default])[0]
details['path'] = url.path
details['mode'] = options_get('mode', 'client')
assert(details['mode'] in ('server', 'client'))
log_level = options_get('logging', 'ERROR').upper()
assert(log_level in ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'))
self.logger = logging.getLogger('c1218.connection.socket.unix')
self.logger.setLevel(getattr(logging, log_level))
return details
def read(self, size=1):
if not self._isOpen:
raise portNotOpenError
data = bytearray()
if self._timeout != None:
timeout = time.time() + self._timeout
else:
timeout = float('inf')
while len(data) < size and time.time() < timeout:
try:
data = self._socket.recv(size - len(data))
except socket.timeout:
continue
except socket.error as error:
raise SerialException('connection failed (' + str(error) + ')')
return bytes(data)
# assemble Serial class with the platform specific implementation and the base
# for file-like behavior. for Python 2.6 and newer, that provide the new I/O
# library, derive from io.RawIOBase
try:
import io
except ImportError:
# classic version with our own file-like emulation
class Serial(UnixSerial, FileLike):
pass
else:
# io library present
class Serial(UnixSerial, io.RawIOBase):
pass
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