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90 lines
3.1 KiB
90 lines
3.1 KiB
5 years ago
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#!/usr/bin/env python
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#
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# This is a wrapper module for different platform implementations
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#
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# This file is part of pySerial. https://github.com/pyserial/pyserial
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# (C) 2001-2017 Chris Liechti <cliechti@gmx.net>
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#
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# SPDX-License-Identifier: BSD-3-Clause
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import sys
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import importlib
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from serial.serialutil import *
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#~ SerialBase, SerialException, to_bytes, iterbytes
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__version__ = '3.4'
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VERSION = __version__
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# pylint: disable=wrong-import-position
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if sys.platform == 'cli':
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from serial.serialcli import Serial
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else:
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import os
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# chose an implementation, depending on os
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if os.name == 'nt': # sys.platform == 'win32':
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from serial.serialwin32 import Serial
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elif os.name == 'posix':
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from serial.serialposix import Serial, PosixPollSerial, VTIMESerial # noqa
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elif os.name == 'java':
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from serial.serialjava import Serial
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else:
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raise ImportError("Sorry: no implementation for your platform ('{}') available".format(os.name))
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protocol_handler_packages = [
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'serial.urlhandler',
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]
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def serial_for_url(url, *args, **kwargs):
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"""\
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Get an instance of the Serial class, depending on port/url. The port is not
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opened when the keyword parameter 'do_not_open' is true, by default it
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is. All other parameters are directly passed to the __init__ method when
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the port is instantiated.
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The list of package names that is searched for protocol handlers is kept in
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``protocol_handler_packages``.
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e.g. we want to support a URL ``foobar://``. A module
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``my_handlers.protocol_foobar`` is provided by the user. Then
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``protocol_handler_packages.append("my_handlers")`` would extend the search
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path so that ``serial_for_url("foobar://"))`` would work.
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"""
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# check and remove extra parameter to not confuse the Serial class
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do_open = not kwargs.pop('do_not_open', False)
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# the default is to use the native implementation
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klass = Serial
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try:
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url_lowercase = url.lower()
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except AttributeError:
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# it's not a string, use default
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pass
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else:
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# if it is an URL, try to import the handler module from the list of possible packages
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if '://' in url_lowercase:
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protocol = url_lowercase.split('://', 1)[0]
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module_name = '.protocol_{}'.format(protocol)
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for package_name in protocol_handler_packages:
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try:
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importlib.import_module(package_name)
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handler_module = importlib.import_module(module_name, package_name)
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except ImportError:
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continue
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else:
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if hasattr(handler_module, 'serial_class_for_url'):
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url, klass = handler_module.serial_class_for_url(url)
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else:
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klass = handler_module.Serial
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break
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else:
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raise ValueError('invalid URL, protocol {!r} not known'.format(protocol))
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# instantiate and open when desired
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instance = klass(None, *args, **kwargs)
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instance.port = url
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if do_open:
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instance.open()
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return instance
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