tools/vns_policy_gen.py

#!/usr/bin/env python
#
# Copyright (C) 2016 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Generate vns_policy.xml from vehicle.h"""
import os
import re
import sys
import datetime

curYear = datetime.datetime.now().year


XML_HEADER = \
"""<!-- Copyright (C) """ + str(curYear) + """ The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
    /

    //Autogenerated from vehicle.h using tools/vns_policy_gen.py.
    //Do not modify manually.
-->

<ALLOW>
  <PROPERTY name="VEHICLE_PROPERTY_INVALID" value = "0x0">
    <!--  Property 0 write is used to allow hal mocking -->
    <UID name="AID_SYSTEM" access="rw" value="1000"/>
    <UID name="AID_AUDIOSERVER" access="r" value="1041"/>
  </PROPERTY>

"""

XML_TRAIL = \
"""</ALLOW>
"""

RE_PROPERTY_PATTERN = r'/\*\*(.*?)\*/\n\#define\s+VEHICLE_PROPERTY_(\S+)\s+(\(0x\S+\))'
AUDIOSERVER_RO_PARAMS = ['VEHICLE_PROPERTY_AUDIO_FOCUS']
AUDIOSERVER_WO_PARAMS = ['VEHICLE_PROPERTY_INTERNAL_AUDIO_STREAM_STATE']
NO_AUTO_GET_PARAMS = ['VEHICLE_PROPERTY_AUDIO_VOLUME', 'VEHICLE_PROPERTY_AUDIO_VOLUME_LIMIT']

class PropertyInfo(object):
  def __init__(self, value, name):
    self.value = value
    self.name = name
    self.type = ""
    self.changeMode = ""
    self.access = ""
    self.unit = ""
    self.startEnd = 0 # _START/END property
    self.aid_audioserver = ""
    self.no_auto_get = 0
    # Check if this property requires special handling
    if name in AUDIOSERVER_RO_PARAMS:
      self.aid_audioserver = 'r'
    if name in AUDIOSERVER_WO_PARAMS:
      self.aid_audioserver = 'w'
    if name in NO_AUTO_GET_PARAMS:
      self.no_auto_get = 1

def printProperties(props, f):
  for p in props:
    if p.startEnd == 0:
      if p.no_auto_get == 0:
        f.write("""  <PROPERTY name=\"""" + p.name + "\" value=\"" + p.value + "\">\n")
      else:
          f.write("""  <PROPERTY name=\"""" + p.name + "\" value=\"" + p.value + """" no_auto_get="true">\n""")
      f.write("""    <UID name="AID_SYSTEM" access=\"""" + p.access + """" value="1000"/>\n""")
      if p.aid_audioserver:
        f.write("""    <UID name="AID_AUDIOSERVER" access=\"""" + p.aid_audioserver + """" value="1041"/>\n""")
      f.write("  </PROPERTY>\n\n")
    elif p.name == 'VEHICLE_PROPERTY_INTERNAL_START':
      f.write("<!-- Internal Vehicle Properties -->\n\n")

def main(argv):
  # If user hasn't called build/envsetup.sh, use relative path
  base_path = os.getenv('ANDROID_BUILD_TOP', "../../../..")

  # Parse vehicle.h file
  vehicle_h_path = base_path + "/hardware/libhardware/include/hardware/vehicle.h"
  #print vehicle_h_path
  f = open(vehicle_h_path, 'r')
  text = f.read()
  f.close()

  # Parse vehicle_internal.h
  vehicle_internal_h_path = base_path + "/packages/services/Car/libvehiclenetwork/include/vehicle-internal.h"
  f = open(vehicle_internal_h_path, 'r')
  text = text + f.read()
  f.close()

  # Open the vns_policy.xml file
  vns_policy_path = base_path + "/packages/services/Car/vns_policy/vns_policy.xml"
  f = open(vns_policy_path, 'w')

  props = []
  property_re = re.compile(RE_PROPERTY_PATTERN, re.MULTILINE | re.DOTALL)
  for match in property_re.finditer(text):
    words = match.group(1).split()
    name = "VEHICLE_PROPERTY_" + match.group(2)
    value = match.group(3)
    if (value[0] == "(" and value[-1] == ")"):
      value = value[1:-1]
    prop = PropertyInfo(value, name)
    i = 0
    while i < len(words):
      if words[i] == "@access":
        i += 1
        if words[i].find("READ") > 0:
          if words[i].find("WRITE") > 0:
            prop.access = 'rw'
          else:
            prop.access = 'r'
        else:
          prop.access = 'w'
      elif words[i] == "@range_start" or words[i] == "@range_end":
        prop.startEnd = 1
      i += 1
    props.append(prop)
    #print prop

  f.write(XML_HEADER)
  printProperties(props, f)
  f.write(XML_TRAIL)

if __name__ == '__main__':
  main(sys.argv)