Viewing file:  bus.py (1.77 KB) -rw-r--r--
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import os
import re
_escape_pat = re.compile(r'%([0-9A-Fa-f]{2})')
def unescape(v):
def repl(match):
n = int(match.group(1), base=16)
return chr(n)
return _escape_pat.sub(repl, v)
def parse_addresses(s):
for addr in s.split(';'):
transport, info = addr.split(':', 1)
kv = {}
for x in info.split(','):
k, v = x.split('=', 1)
kv[k] = unescape(v)
yield (transport, kv)
SUPPORTED_TRANSPORTS = ('unix',)
def get_connectable_addresses(addr):
unsupported_transports = set()
found = False
for transport, kv in parse_addresses(addr):
if transport not in SUPPORTED_TRANSPORTS:
unsupported_transports.add(transport)
elif transport == 'unix':
if 'abstract' in kv:
yield '\0' + kv['abstract']
found = True
elif 'path' in kv:
yield kv['path']
found = True
if not found:
raise RuntimeError("DBus transports ({}) not supported. Supported: {}"
.format(unsupported_transports, SUPPORTED_TRANSPORTS))
def find_session_bus():
addr = os.environ['DBUS_SESSION_BUS_ADDRESS']
return next(get_connectable_addresses(addr))
# TODO: fallbacks to X, filesystem
def find_system_bus():
addr = os.environ.get('DBUS_SYSTEM_BUS_ADDRESS', '') \
or 'unix:path=/var/run/dbus/system_bus_socket'
return next(get_connectable_addresses(addr))
def get_bus(addr):
if addr == 'SESSION':
return find_session_bus()
elif addr == 'SYSTEM':
return find_system_bus()
else:
return next(get_connectable_addresses(addr))
if __name__ == '__main__':
print('System bus at:', find_system_bus())
print('Session bus at:', find_session_bus())
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