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140 lines
3.5 KiB
Python
140 lines
3.5 KiB
Python
"""DBus implementation with glib."""
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import asyncio
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import logging
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import shlex
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import xml.etree.ElementTree as ET
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_LOGGER = logging.getLogger(__name__)
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INTROSPECT = ("gdbus introspect --system --dest {bus} "
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"--object-path {obj} --xml")
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CALL = ("gdbus call --system --dest {bus} --object-path {obj} "
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"--method {obj}.{method} {args}")
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class DBusError(Exception):
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"""DBus generic error."""
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pass
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class DBusFatalError(DBusError):
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"""DBus call going wrong."""
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pass
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class DBusReturnError(DBusError):
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"""DBus return error."""
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pass
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class DBusParseError(DBusError):
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"""DBus parse error."""
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pass
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class DBus(object):
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"""DBus handler."""
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def __init__(self, bus_name, object_path):
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"""Initialize dbus object."""
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self.bus_name = bus_name
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self.object_path = object_path
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self.methods = []
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@staticmethod
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async def connect(bus_name, object_path):
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"""Read object data."""
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self = DBus(bus_name, object_path)
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self._init_proxy() # pylint: disable=protected-access
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_LOGGER.info("Connect to dbus: %s", bus_name)
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return self
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async def _init_proxy(self):
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"""Read object data."""
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command = shlex.split(INTROSPECT.format(
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bus=self.bus_name,
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obj=self.object_path
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))
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# Ask data
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try:
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data = await self._send(command)
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except DBusError:
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_LOGGER.error(
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"DBus fails connect to %s", self.object_path)
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raise
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# Parse XML
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try:
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xml = ET.fromstring(data)
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except ET.ParseError as err:
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_LOGGER.error("Can't parse introspect data: %s", err)
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raise DBusParseError() from None
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# Read available methods
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for method in xml.findall(".//method"):
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self.methods.append(method.get('name'))
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@staticmethod
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def _gvariant(raw):
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"""Parse GVariant input to python."""
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return raw
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async def _call_dbus(self, method, *args):
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"""Call a dbus method."""
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command = shlex.split(CALL.format(
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bus=self.bus_name,
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obj=self.object_path,
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method=method,
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args=" ".join(map(str, args))
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))
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# Run command
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try:
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data = await self._send(command)
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except DBusError:
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_LOGGER.error(
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"DBus fails with %s on %s", method, self.object_path)
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raise
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# Parse and return data
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return self._gvariant(data)
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async def _send(self, command):
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"""Send command over dbus."""
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# Run command
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try:
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proc = await asyncio.create_subprocess_exec(
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*command,
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stdin=asyncio.subprocess.DEVNULL,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.DEVNULL
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)
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data, _ = await proc.communicate()
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except OSError as err:
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_LOGGER.error("DBus fatal error: %s", err)
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raise DBusFatalError() from None
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# Success?
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if proc.returncode != 0:
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raise DBusReturnError()
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# End
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return data.decode()
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def __getattr__(self, name):
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"""Mapping to dbus method."""
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if name not in self.methods:
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raise AttributeError()
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def _method_wrapper(*args):
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"""Wrap method.
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Return a coroutine
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"""
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return self._call_dbus(name, *args)
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return _method_wrapper
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