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# coding: utf-8
"""
Contains handling of ASC logging files.
Example .asc files:
- https://bitbucket.org/tobylorenz/vector_asc/src/47556e1a6d32c859224ca62d075e1efcc67fa690/src/Vector/ASC/tests/unittests/data/CAN_Log_Trigger_3_2.asc?at=master&fileviewer=file-view-default
- under `test/data/logfile.asc`
"""
from __future__ import absolute_import
from datetime import datetime
import time
import logging
from ..message import Message
from ..listener import Listener
from ..util import channel2int
from .generic import BaseIOHandler
CAN_MSG_EXT = 0x80000000
CAN_ID_MASK = 0x1FFFFFFF
logger = logging.getLogger('can.io.asc')
class ASCReader(BaseIOHandler):
"""
Iterator of CAN messages from a ASC logging file.
TODO: turn relative timestamps back to absolute form
"""
def __init__(self, file):
"""
:param file: a path-like object or as file-like object to read from
If this is a file-like object, is has to opened in text
read mode, not binary read mode.
"""
super(ASCReader, self).__init__(file, mode='r')
@staticmethod
def _extract_can_id(str_can_id):
if str_can_id[-1:].lower() == 'x':
is_extended = True
can_id = int(str_can_id[0:-1], 16)
else:
is_extended = False
can_id = int(str_can_id, 16)
#logging.debug('ASCReader: _extract_can_id("%s") -> %x, %r', str_can_id, can_id, is_extended)
return can_id, is_extended
def __iter__(self):
for line in self.file:
#logger.debug("ASCReader: parsing line: '%s'", line.splitlines()[0])
temp = line.strip()
if not temp or not temp[0].isdigit():
continue
try:
timestamp, channel, dummy = temp.split(None, 2) # , frameType, dlc, frameData
except ValueError:
# we parsed an empty comment
continue
timestamp = float(timestamp)
try:
# See ASCWriter
channel = int(channel) - 1
except ValueError:
pass
if dummy.strip()[0:10] == 'ErrorFrame':
msg = Message(timestamp=timestamp, is_error_frame=True,
channel=channel)
yield msg
elif not isinstance(channel, int) or dummy.strip()[0:10] == 'Statistic:':
pass
elif dummy[-1:].lower() == 'r':
can_id_str, _ = dummy.split(None, 1)
can_id_num, is_extended_id = self._extract_can_id(can_id_str)
msg = Message(timestamp=timestamp,
arbitration_id=can_id_num & CAN_ID_MASK,
extended_id=is_extended_id,
is_remote_frame=True,
channel=channel)
yield msg
else:
try:
# this only works if dlc > 0 and thus data is availabe
can_id_str, _, _, dlc, data = dummy.split(None, 4)
except ValueError:
# but if not, we only want to get the stuff up to the dlc
can_id_str, _, _, dlc = dummy.split(None, 3)
# and we set data to an empty sequence manually
data = ''
dlc = int(dlc)
frame = bytearray()
data = data.split()
for byte in data[0:dlc]:
frame.append(int(byte, 16))
can_id_num, is_extended_id = self._extract_can_id(can_id_str)
yield Message(
timestamp=timestamp,
arbitration_id=can_id_num & CAN_ID_MASK,
extended_id=is_extended_id,
is_remote_frame=False,
dlc=dlc,
data=frame,
channel=channel
)
self.stop()
class ASCWriter(BaseIOHandler, Listener):
"""Logs CAN data to an ASCII log file (.asc).
The measurement starts with the timestamp of the first registered message.
If a message has a timestamp smaller than the previous one or None,
it gets assigned the timestamp that was written for the last message.
It the first message does not have a timestamp, it is set to zero.
"""
FORMAT_MESSAGE = "{channel} {id:<15} Rx {dtype} {data}"
FORMAT_DATE = "%a %b %m %I:%M:%S %p %Y"
FORMAT_EVENT = "{timestamp: 9.4f} {message}\n"
def __init__(self, file, channel=1):
"""
:param file: a path-like object or as file-like object to write to
If this is a file-like object, is has to opened in text
write mode, not binary write mode.
:param channel: a default channel to use when the message does not
have a channel set
"""
super(ASCWriter, self).__init__(file, mode='w')
self.channel = channel
# write start of file header
now = datetime.now().strftime("%a %b %m %I:%M:%S %p %Y")
self.file.write("date %s\n" % now)
self.file.write("base hex timestamps absolute\n")
self.file.write("internal events logged\n")
# the last part is written with the timestamp of the first message
self.header_written = False
self.last_timestamp = None
self.started = None
def stop(self):
if not self.file.closed:
self.file.write("End TriggerBlock\n")
super(ASCWriter, self).stop()
def log_event(self, message, timestamp=None):
"""Add a message to the log file.
:param str message: an arbitrary message
:param float timestamp: the absolute timestamp of the event
"""
if not message: # if empty or None
logger.debug("ASCWriter: ignoring empty message")
return
# this is the case for the very first message:
if not self.header_written:
self.last_timestamp = (timestamp or 0.0)
self.started = self.last_timestamp
formatted_date = time.strftime(self.FORMAT_DATE, time.localtime(self.last_timestamp))
self.file.write("Begin Triggerblock %s\n" % formatted_date)
self.header_written = True
self.log_event("Start of measurement") # caution: this is a recursive call!
# figure out the correct timestamp
if timestamp is None or timestamp < self.last_timestamp:
timestamp = self.last_timestamp
# turn into relative timestamps if necessary
if timestamp >= self.started:
timestamp -= self.started
line = self.FORMAT_EVENT.format(timestamp=timestamp, message=message)
self.file.write(line)
def on_message_received(self, msg):
if msg.is_error_frame:
self.log_event("{} ErrorFrame".format(self.channel), msg.timestamp)
return
if msg.is_remote_frame:
dtype = 'r'
data = []
else:
dtype = "d {}".format(msg.dlc)
data = ["{:02X}".format(byte) for byte in msg.data]
arb_id = "{:X}".format(msg.arbitration_id)
if msg.is_extended_id:
arb_id += 'x'
channel = channel2int(msg.channel)
if channel is None:
channel = self.channel
else:
# Many interfaces start channel numbering at 0 which is invalid
channel += 1
serialized = self.FORMAT_MESSAGE.format(channel=channel,
id=arb_id,
dtype=dtype,
data=' '.join(data))
self.log_event(serialized, msg.timestamp)
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