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#!/usr/bin/env python3
#
# Copyright (C) 2017 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.
#
# OBD2 standard sensor indices are different from those used by the
# Android Auto Diagnostics API. This script maps from OBD2 sensors to
# those expected by the Diagnostics API.
# To use:
# ./obd2_to_diagjson.py --src file1.json --dst file2.json
# It is acceptable and supported to point --src and --dst to the same file
import collections
import json
import os, os.path, sys
class Json(object):
@classmethod
def load(cls, file):
return Json(json.load(file))
@classmethod
def wrapIfNeeded(cls, item):
if isinstance(item, list) or isinstance(item, dict):
return Json(item)
return item
def __init__(self, doc):
self.doc = doc
def __str__(self):
return str(self.doc)
def __repr__(self):
return self.__str__()
def __getattr__(self, attr):
return Json.wrapIfNeeded(self.doc.get(attr))
def __iter__(self):
class Iter(object):
def __init__(self, doc):
self.doc = doc.__iter__()
def __next__(self):
return Json.wrapIfNeeded(self.doc.__next__())
return Iter(self.doc)
class OrderedStore(object):
def __init__(self):
self.__dict__['store'] = collections.OrderedDict()
def __setattr__(self, name, value):
self.__dict__['store'][name] = value
def __getattr__(self, name):
return self.__dict__['store'][name]
def get(self, name, default=None):
return self.__dict__['store'].get(name, default)
def getStore(self):
return self.__dict__['store']
def __iter__(self):
return iter(self.__dict__['store'])
def __delattr__(self, name):
del self.__dict__['store'][name]
def __str__(self):
return str(self.__dict__['store'])
def toJSON(self):
return json.dumps(self.store)
class Event(object):
def __init__(self):
self.store = OrderedStore()
def setTimestamp(self, timestamp):
self.store.timestamp = timestamp
return self
def getTimestamp(self):
return self.store.timestamp
def setType(self, type):
self.store.type = type
return self
def getType(self):
return self.store.type
def setStringValue(self, string):
if string:
self.store.stringValue = string
return self
def getStringValue(self):
return self.store.get('stringValue')
def setIntValue(self, id, value):
if 'intValues' not in self.store:
self.store.intValues = []
d = collections.OrderedDict()
d['id'] = id
d['value'] = value
self.store.intValues.append(d)
return self
def intValues(self):
if 'intValues' not in self.store:
return []
for value in self.store.intValues:
yield (value['id'], value['value'])
def setFloatValue(self, id, value):
if 'floatValues' not in self.store:
self.store.floatValues = []
d = collections.OrderedDict()
d['id'] = id
d['value'] = value
self.store.floatValues.append(d)
return self
def floatValues(self):
if 'floatValues' not in self.store:
return []
for value in self.store.floatValues:
yield (value['id'], value['value'])
@classmethod
def fromJson(cls, json):
event = Event()
event.setTimestamp(json.timestamp)
event.setType(json.type)
for intValue in json.intValues:
event.setIntValue(intValue.id, intValue.value)
for floatValue in json.floatValues:
event.setFloatValue(floatValue.id, floatValue.value)
event.setStringValue(json.stringValue)
return event
def transform(self, intMapping, floatMapping):
event = Event()
event.setTimestamp(self.getTimestamp())
event.setType(self.getType())
for id, value in self.intValues():
if id in intMapping:
intMapping[id](event, value)
else:
print('warning: integer id 0x%x not found in mapping. dropped.' % id)
for id, value in self.floatValues():
if id in floatMapping:
floatMapping[id](event, value)
else:
print('warning: float id 0x%x not found in mapping. dropped.' % id)
event.setStringValue(self.getStringValue())
return event
def getStore(self):
return self.store.getStore()
class EventEncoder(json.JSONEncoder):
def default(self, o):
if isinstance(o, Event):
return o.getStore()
# Mappings between standard OBD2 sensors and the indices
# used by Vehicle HAL
intSensorsMapping = {
0x03 : lambda event,value: event.setIntValue(0, value),
0x05 : lambda event,value: event.setFloatValue(1, value),
0x0A : lambda event,value: event.setIntValue(22, value),
0x0C : lambda event,value: event.setFloatValue(8, value),
0x0D : lambda event,value: event.setFloatValue(9, value),
0x1F : lambda event,value: event.setIntValue(7, value),
0x5C : lambda event,value: event.setIntValue(23, value),
}
floatSensorsMapping = {
0x04 : lambda event, value: event.setFloatValue(0, value),
0x06 : lambda event, value: event.setFloatValue(2, value),
0x07 : lambda event, value: event.setFloatValue(3, value),
0x08 : lambda event, value: event.setFloatValue(4, value),
0x09 : lambda event, value: event.setFloatValue(5, value),
0x11 : lambda event, value: event.setFloatValue(12, value),
0x2F : lambda event, value: event.setFloatValue(42, value),
0x46 : lambda event, value: event.setIntValue(13, int(value)),
}
def parseOptions():
from argparse import ArgumentParser
parser = ArgumentParser(description='OBD2 to Diagnostics JSON Converter')
parser.add_argument('--src', '-S', dest='source_file',
help='The source file to convert from', required=True)
parser.add_argument('--dst', '-D', dest='destination_file',
help='The destination file to convert to', required=True)
return parser.parse_args()
args = parseOptions()
if not os.path.exists(args.source_file):
print('source file %s does not exist' % args.source_file)
sys.exit(1)
source_json = Json.load(open(args.source_file))
dest_events = []
for source_json_event in source_json:
source_event = Event.fromJson(source_json_event)
destination_event = source_event.transform(intSensorsMapping, floatSensorsMapping)
dest_events.append(destination_event)
json.dump(dest_events, open(args.destination_file, 'w'), cls=EventEncoder)
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