| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| # |
| # Copyright 2016 Google Inc. |
| # |
| # 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. |
| # |
| |
| """ |
| This module provides a vhal class which sends and receives messages to the vehicle HAL module |
| on an Android Auto device. It uses port forwarding via ADB to communicate with the Android |
| device. |
| |
| Example Usage: |
| |
| import vhal_consts_2_0 as c |
| from vhal_emulator import Vhal |
| |
| # Create an instance of vhal class. Need to pass the vhal_types constants. |
| v = Vhal(c.vhal_types_2_0) |
| |
| # Get the property config (if desired) |
| v.getConfig(c.VEHICLEPROPERTY_HVAC_TEMPERATURE_SET) |
| |
| # Get the response message to getConfig() |
| reply = v.rxMsg() |
| print(reply) |
| |
| # Set left temperature to 70 degrees |
| v.setProperty(c.VEHICLEPROPERTY_HVAC_TEMPERATURE_SET, c.VEHICLEAREAZONE_ROW_1_LEFT, 70) |
| |
| # Get the response message to setProperty() |
| reply = v.rxMsg() |
| print(reply) |
| |
| # Get the left temperature value |
| v.getProperty(c.VEHICLEPROPERTY_HVAC_TEMPERATURE_SET, c.VEHICLEAREAZONE_ROW_1_LEFT) |
| |
| # Get the response message to getProperty() |
| reply = v.rxMsg() |
| print(reply) |
| |
| NOTE: The rxMsg() is a blocking call, so it may be desirable to set up a separate RX thread |
| to handle any asynchronous messages coming from the device. |
| |
| Example for creating RX thread (assumes vhal has already been instantiated): |
| |
| from threading import Thread |
| |
| # Define a simple thread that receives messags from a vhal object (v) and prints them |
| def rxThread(v): |
| while(1): |
| print v.rxMsg() |
| |
| rx = Thread(target=rxThread, args=(v,)) |
| rx.start() |
| |
| Protocol Buffer: |
| This module relies on VehicleHalProto_pb2.py being in sync with the protobuf in the VHAL. |
| If the VehicleHalProto.proto file has changed, re-generate the python version using: |
| |
| protoc -I=<proto_dir> --python_out=<out_dir> <proto_dir>/VehicleHalProto.proto |
| """ |
| |
| from __future__ import print_function |
| |
| # Suppress .pyc files |
| import sys |
| sys.dont_write_bytecode = True |
| |
| import socket |
| import struct |
| import subprocess |
| |
| # Generate the protobuf file from hardware/interfaces/automotive/vehicle/2.0/default/impl/vhal_v2_0 |
| # It is recommended to use the protoc provided in: prebuilts/tools/common/m2/repository/com/google/protobuf/protoc/3.0.0 |
| # or a later version, in order to provide Python 3 compatibility |
| # protoc -I=proto --python_out=proto proto/VehicleHalProto.proto |
| import VehicleHalProto_pb2 |
| |
| # If container is a dictionary, retrieve the value for key item; |
| # Otherwise, get the attribute named item out of container |
| def getByAttributeOrKey(container, item, default=None): |
| if isinstance(container, dict): |
| try: |
| return container[item] |
| except KeyError as e: |
| return default |
| try: |
| return getattr(container, item) |
| except AttributeError as e: |
| return default |
| |
| class Vhal: |
| """ |
| Dictionary of prop_id to value_type. Used by setProperty() to properly format data. |
| """ |
| _propToType = {} |
| |
| ### Private Functions |
| def _txCmd(self, cmd): |
| """ |
| Transmits a protobuf to Android Auto device. Should not be called externally. |
| """ |
| # Serialize the protobuf into a string |
| msgStr = cmd.SerializeToString() |
| msgLen = len(msgStr) |
| # Convert the message length into int32 byte array |
| msgHdr = struct.pack('!I', msgLen) |
| # Send the message length first |
| self.sock.send(msgHdr) |
| # Then send the protobuf |
| self.sock.send(msgStr) |
| |
| ### Public Functions |
| def printHex(self, data): |
| """ |
| For debugging, print the protobuf message string in hex. |
| """ |
| print("len = ", len(data), "str = ", ":".join("{:02x}".format(ord(d)) for d in data)) |
| |
| def openSocket(self): |
| """ |
| Connects to an Android Auto device running a Vehicle HAL with simulator. |
| """ |
| # Hard-coded socket port needs to match the one in DefaultVehicleHal |
| portNumber = 33452 |
| # Setup ADB port forwarding |
| subprocess.call("adb forward tcp:%d tcp:%d" % (portNumber, portNumber), shell=True) |
| # Open the socket and connect |
| self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| self.sock.connect(('localhost', portNumber)) |
| |
| def rxMsg(self): |
| """ |
| Receive a message over the socket. This function blocks if a message is not available. |
| May want to wrap this function inside of an rx thread to also collect asynchronous |
| messages generated by the device. |
| """ |
| # Receive the message length (int32) first |
| b = self.sock.recv(4) |
| if (len(b) == 4): |
| msgLen, = struct.unpack('!I', b) |
| if (msgLen > 0): |
| # Receive the actual message |
| b = self.sock.recv(msgLen) |
| if (len(b) == msgLen): |
| # Unpack the protobuf |
| msg = VehicleHalProto_pb2.EmulatorMessage() |
| msg.ParseFromString(b) |
| return msg |
| |
| def getConfig(self, prop): |
| """ |
| Sends a getConfig message for the specified property. |
| """ |
| cmd = VehicleHalProto_pb2.EmulatorMessage() |
| cmd.msg_type = VehicleHalProto_pb2.GET_CONFIG_CMD |
| propGet = cmd.prop.add() |
| propGet.prop = prop |
| self._txCmd(cmd) |
| |
| def getConfigAll(self): |
| """ |
| Sends a getConfigAll message to the host. This will return all configs available. |
| """ |
| cmd = VehicleHalProto_pb2.EmulatorMessage() |
| cmd.msg_type = VehicleHalProto_pb2.GET_CONFIG_ALL_CMD |
| self._txCmd(cmd) |
| |
| def getProperty(self, prop, area_id): |
| """ |
| Sends a getProperty command for the specified property ID and area ID. |
| """ |
| cmd = VehicleHalProto_pb2.EmulatorMessage() |
| cmd.msg_type = VehicleHalProto_pb2.GET_PROPERTY_CMD |
| propGet = cmd.prop.add() |
| propGet.prop = prop |
| propGet.area_id = area_id |
| self._txCmd(cmd) |
| |
| def getPropertyAll(self): |
| """ |
| Sends a getPropertyAll message to the host. This will return all properties available. |
| """ |
| cmd = VehicleHalProto_pb2.EmulatorMessage() |
| cmd.msg_type = VehicleHalProto_pb2.GET_PROPERTY_ALL_CMD |
| self._txCmd(cmd) |
| |
| def setProperty(self, prop, area_id, value): |
| """ |
| Sends a setProperty command for the specified property ID, area ID, and value. |
| This function chooses the proper value field to populate based on the config for the |
| property. It is the caller's responsibility to ensure the value data is the proper |
| type. |
| """ |
| cmd = VehicleHalProto_pb2.EmulatorMessage() |
| cmd.msg_type = VehicleHalProto_pb2.SET_PROPERTY_CMD |
| propValue = cmd.value.add() |
| propValue.prop = prop |
| # Insert value into the proper area |
| propValue.area_id = area_id |
| # Determine the value_type and populate the correct value field in protoBuf |
| try: |
| valType = self._propToType[prop] |
| except KeyError: |
| raise ValueError('propId is invalid:', prop) |
| return |
| propValue.value_type = valType |
| if valType in self._types.TYPE_STRING: |
| propValue.string_value = value |
| elif valType in self._types.TYPE_BYTES: |
| propValue.bytes_value = value |
| elif valType in self._types.TYPE_INT32: |
| propValue.int32_values.append(value) |
| elif valType in self._types.TYPE_INT64: |
| propValue.int64_values.append(value) |
| elif valType in self._types.TYPE_FLOAT: |
| propValue.float_values.append(value) |
| elif valType in self._types.TYPE_INT32S: |
| propValue.int32_values.extend(value) |
| elif valType in self._types.TYPE_FLOATS: |
| propValue.float_values.extend(value) |
| elif valType in self._types.TYPE_COMPLEX: |
| propValue.string_value = \ |
| getByAttributeOrKey(value, 'string_value', '') |
| propValue.bytes_value = \ |
| getByAttributeOrKey(value, 'bytes_value', '') |
| for newValue in getByAttributeOrKey(value, 'int32_values', []): |
| propValue.int32_values.append(newValue) |
| for newValue in getByAttributeOrKey(value, 'int64_values', []): |
| propValue.int64_values.append(newValue) |
| for newValue in getByAttributeOrKey(value, 'float_values', []): |
| propValue.float_values.append(newValue) |
| else: |
| raise ValueError('value type not recognized:', valType) |
| return |
| self._txCmd(cmd) |
| |
| def __init__(self, types): |
| # Save the list of types constants |
| self._types = types |
| # Open the socket |
| self.openSocket() |
| # Get the list of configs |
| self.getConfigAll() |
| msg = self.rxMsg() |
| # Parse the list of configs to generate a dictionary of prop_id to type |
| for cfg in msg.config: |
| self._propToType[cfg.prop] = cfg.value_type |