174 lines
6.9 KiB
Python
174 lines
6.9 KiB
Python
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import time
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from collections import defaultdict
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from functools import partial
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import cereal.messaging as messaging
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from openpilot.common.swaglog import cloudlog
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from openpilot.selfdrive.pandad import can_list_to_can_capnp
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from openpilot.selfdrive.car.fw_query_definitions import AddrType
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from panda.python.uds import CanClient, IsoTpMessage, FUNCTIONAL_ADDRS, get_rx_addr_for_tx_addr
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class IsoTpParallelQuery:
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def __init__(self, sendcan: messaging.PubSocket, logcan: messaging.SubSocket, bus: int, addrs: list[int] | list[AddrType],
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request: list[bytes], response: list[bytes], response_offset: int = 0x8,
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functional_addrs: list[int] = None, debug: bool = False, response_pending_timeout: float = 10) -> None:
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self.sendcan = sendcan
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self.logcan = logcan
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self.bus = bus
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self.request = request
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self.response = response
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self.functional_addrs = functional_addrs or []
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self.debug = debug
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self.response_pending_timeout = response_pending_timeout
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real_addrs = [a if isinstance(a, tuple) else (a, None) for a in addrs]
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for tx_addr, _ in real_addrs:
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assert tx_addr not in FUNCTIONAL_ADDRS, f"Functional address should be defined in functional_addrs: {hex(tx_addr)}"
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self.msg_addrs = {tx_addr: get_rx_addr_for_tx_addr(tx_addr[0], rx_offset=response_offset) for tx_addr in real_addrs}
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self.msg_buffer: dict[int, list[tuple[int, int, bytes, int]]] = defaultdict(list)
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def rx(self):
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"""Drain can socket and sort messages into buffers based on address"""
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can_packets = messaging.drain_sock(self.logcan, wait_for_one=True)
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for packet in can_packets:
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for msg in packet.can:
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if msg.src == self.bus and msg.address in self.msg_addrs.values():
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self.msg_buffer[msg.address].append((msg.address, msg.busTime, msg.dat, msg.src))
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def _can_tx(self, tx_addr, dat, bus):
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"""Helper function to send single message"""
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msg = [tx_addr, 0, dat, bus]
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self.sendcan.send(can_list_to_can_capnp([msg], msgtype='sendcan'))
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def _can_rx(self, addr, sub_addr=None):
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"""Helper function to retrieve message with specified address and subadress from buffer"""
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keep_msgs = []
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if sub_addr is None:
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msgs = self.msg_buffer[addr]
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else:
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# Filter based on subadress
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msgs = []
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for m in self.msg_buffer[addr]:
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first_byte = m[2][0]
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if first_byte == sub_addr:
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msgs.append(m)
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else:
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keep_msgs.append(m)
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self.msg_buffer[addr] = keep_msgs
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return msgs
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def _drain_rx(self):
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messaging.drain_sock_raw(self.logcan)
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self.msg_buffer = defaultdict(list)
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def _create_isotp_msg(self, tx_addr: int, sub_addr: int | None, rx_addr: int):
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can_client = CanClient(self._can_tx, partial(self._can_rx, rx_addr, sub_addr=sub_addr), tx_addr, rx_addr,
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self.bus, sub_addr=sub_addr, debug=self.debug)
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max_len = 8 if sub_addr is None else 7
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# uses iso-tp frame separation time of 10 ms
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# TODO: use single_frame_mode so ECUs can send as fast as they want,
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# as well as reduces chances we process messages from previous queries
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return IsoTpMessage(can_client, timeout=0, separation_time=0.01, debug=self.debug, max_len=max_len)
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def get_data(self, timeout: float, total_timeout: float = 60.) -> dict[AddrType, bytes]:
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self._drain_rx()
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# Create message objects
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msgs = {}
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request_counter = {}
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request_done = {}
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for tx_addr, rx_addr in self.msg_addrs.items():
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msgs[tx_addr] = self._create_isotp_msg(*tx_addr, rx_addr)
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request_counter[tx_addr] = 0
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request_done[tx_addr] = False
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# Send first request to functional addrs, subsequent responses are handled on physical addrs
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if len(self.functional_addrs):
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for addr in self.functional_addrs:
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self._create_isotp_msg(addr, None, -1).send(self.request[0])
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# Send first frame (single or first) to all addresses and receive asynchronously in the loop below.
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# If querying functional addrs, only set up physical IsoTpMessages to send consecutive frames
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for msg in msgs.values():
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msg.send(self.request[0], setup_only=len(self.functional_addrs) > 0)
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results = {}
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start_time = time.monotonic()
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addrs_responded = set() # track addresses that have ever sent a valid iso-tp frame for timeout logging
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response_timeouts = {tx_addr: start_time + timeout for tx_addr in self.msg_addrs}
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while True:
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self.rx()
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for tx_addr, msg in msgs.items():
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try:
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dat, rx_in_progress = msg.recv()
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except Exception:
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cloudlog.exception(f"Error processing UDS response: {tx_addr}")
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request_done[tx_addr] = True
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continue
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# Extend timeout for each consecutive ISO-TP frame to avoid timing out on long responses
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if rx_in_progress:
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addrs_responded.add(tx_addr)
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response_timeouts[tx_addr] = time.monotonic() + timeout
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if dat is None:
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continue
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# Log unexpected empty responses
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if len(dat) == 0:
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cloudlog.error(f"iso-tp query empty response: {tx_addr}")
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request_done[tx_addr] = True
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continue
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counter = request_counter[tx_addr]
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expected_response = self.response[counter]
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response_valid = dat.startswith(expected_response)
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if response_valid:
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if counter + 1 < len(self.request):
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response_timeouts[tx_addr] = time.monotonic() + timeout
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msg.send(self.request[counter + 1])
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request_counter[tx_addr] += 1
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else:
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results[tx_addr] = dat[len(expected_response):]
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request_done[tx_addr] = True
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else:
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error_code = dat[2] if len(dat) > 2 else -1
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if error_code == 0x78:
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response_timeouts[tx_addr] = time.monotonic() + self.response_pending_timeout
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cloudlog.error(f"iso-tp query response pending: {tx_addr}")
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else:
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request_done[tx_addr] = True
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cloudlog.error(f"iso-tp query bad response: {tx_addr} - 0x{dat.hex()}")
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# Mark request done if address timed out
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cur_time = time.monotonic()
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for tx_addr in response_timeouts:
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if cur_time - response_timeouts[tx_addr] > 0:
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if not request_done[tx_addr]:
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if request_counter[tx_addr] > 0:
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cloudlog.error(f"iso-tp query timeout after receiving partial response: {tx_addr}")
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elif tx_addr in addrs_responded:
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cloudlog.error(f"iso-tp query timeout while receiving response: {tx_addr}")
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# TODO: handle functional addresses
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# else:
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# cloudlog.error(f"iso-tp query timeout with no response: {tx_addr}")
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request_done[tx_addr] = True
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# Break if all requests are done (finished or timed out)
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if all(request_done.values()):
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break
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if cur_time - start_time > total_timeout:
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cloudlog.error("iso-tp query timeout while receiving data")
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break
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return results
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