Release 3.3.4

.travis.yml

@@ -25,6 +25,7 @@ env:
 install:
   - if [[ "$TEST_SOCKETCAN" ]]; then sudo bash test/open_vcan.sh ; fi
   - travis_retry pip install .[test]
+  - pip freeze
 
 script:
   - |
@@ -52,6 +53,14 @@ jobs:
 
     # Unit Testing Stage
 
+    # testing socketcan on Trusty & Python 2.7, since it is not available on Xenial
+    - stage: test
+      name: Socketcan
+      os: linux
+      dist: trusty
+      python: "2.7"
+      sudo: required
+      env: TEST_SOCKETCAN=TRUE
     # testing socketcan on Trusty & Python 3.6, since it is not available on Xenial
     - stage: test
       name: Socketcan

CHANGELOG.txt

@@ -1,3 +1,17 @@
+Version 3.3.4
+====
+
+Last call for Python2 support.
+
+* #916 Vector: Skip channels without CAN support
+* #846 Use inter-process mutex to prevent concurrent neoVI device open.
+* #901 Fix iteration in Bus.stop_all_periodic_tasks
+* #850 Fix socket.error is a deprecated alias of OSError used on Python versions lower than 3.3.
+* #879 Updating incorrect api documentation.
+* #885 Fix recursion message in Message.__getattr__
+* #845 Fix socketcan issue
+
+
 Version 3.3.3
 ====
 

can/__init__.py

@@ -8,7 +8,7 @@
 
 import logging
 
-__version__ = "3.3.3"
+__version__ = "3.3.4"
 
 log = logging.getLogger('can')
 

can/bus.py

@@ -247,13 +247,21 @@ def _send_periodic_internal(self, msg, period, duration=None):
         return task
 
     def stop_all_periodic_tasks(self, remove_tasks=True):
-        """Stop sending any messages that were started using bus.send_periodic
+        """Stop sending any messages that were started using **bus.send_periodic**.
+
+        .. note::
+            The result is undefined if a single task throws an exception while being stopped.
 
         :param bool remove_tasks:
             Stop tracking the stopped tasks.
         """
         for task in self._periodic_tasks:
-            task.stop(remove_task=remove_tasks)
+            # we cannot let `task.stop()` modify `self._periodic_tasks` while we are
+            # iterating over it (#634)
+            task.stop(remove_task=False)
+
+        if remove_tasks:
+            self._periodic_tasks = []
 
     def __iter__(self):
         """Allow iteration on messages as they are received.

can/interfaces/ics_neovi/neovi_bus.py

@@ -11,6 +11,8 @@
 """
 
 import logging
+import os
+import tempfile
 from collections import deque
 
 from can import Message, CanError, BusABC
@@ -27,6 +29,35 @@
     ics = None
 
 
+try:
+    from filelock import FileLock
+except ImportError as ie:
+
+    logger.warning(
+        "Using ICS NeoVi can backend without the "
+        "filelock module installed may cause some issues!: %s",
+        ie,
+    )
+
+    class FileLock:
+        """Dummy file lock that does not actually do anything"""
+
+        def __init__(self, lock_file, timeout=-1):
+            self._lock_file = lock_file
+            self.timeout = timeout
+
+        def __enter__(self):
+            return self
+
+        def __exit__(self, exc_type, exc_val, exc_tb):
+            return None
+
+
+# Use inter-process mutex to prevent concurrent device open.
+# When neoVI server is enabled, there is an issue with concurrent device open.
+open_lock = FileLock(os.path.join(tempfile.gettempdir(), "neovi.lock"))
+
+
 class ICSApiError(CanError):
     """
     Indicates an error with the ICS API.
@@ -118,18 +149,28 @@ def __init__(self, channel, can_filters=None, **kwargs):
         type_filter = kwargs.get('type_filter')
         serial = kwargs.get('serial')
         self.dev = self._find_device(type_filter, serial)
-        ics.open_device(self.dev)
 
-        if 'bitrate' in kwargs:
-            for channel in self.channels:
-                ics.set_bit_rate(self.dev, kwargs.get('bitrate'), channel)
+        with open_lock:
+            ics.open_device(self.dev)
 
-        fd = kwargs.get('fd', False)
-        if fd:
-            if 'data_bitrate' in kwargs:
+        try:
+            if "bitrate" in kwargs:
                 for channel in self.channels:
-                    ics.set_fd_bit_rate(
-                        self.dev, kwargs.get('data_bitrate'), channel)
+                    ics.set_bit_rate(self.dev, kwargs.get("bitrate"), channel)
+
+            if kwargs.get("fd", False):
+                if "data_bitrate" in kwargs:
+                    for channel in self.channels:
+                        ics.set_fd_bit_rate(
+                            self.dev, kwargs.get("data_bitrate"), channel
+                        )
+        except ics.RuntimeError as re:
+            logger.error(re)
+            err = ICSApiError(*ics.get_last_api_error(self.dev))
+            try:
+                self.shutdown()
+            finally:
+                raise err
 
         self._use_system_timestamp = bool(
             kwargs.get('use_system_timestamp', False)

can/interfaces/ixxat/canlib.py

@@ -328,10 +328,12 @@ def __init__(self, channel, can_filters=None, **kwargs):
                 else:
                     raise VCIDeviceNotFoundError("Unique HW ID {} not connected or not available.".format(UniqueHardwareId))
             else:
-                if (UniqueHardwareId is None) or (self._device_info.UniqueHardwareId.AsChar == bytes(UniqueHardwareId, 'ascii')):
+                if (UniqueHardwareId is None) or (
+                        self._device_info.UniqueHardwareId.AsChar == UniqueHardwareId.encode("ascii")):
                     break
                 else:
-                    log.debug("Ignoring IXXAT with hardware id '%s'.", self._device_info.UniqueHardwareId.AsChar.decode("ascii"))
+                    log.debug("Ignoring IXXAT with hardware id '%s'.",
+                              self._device_info.UniqueHardwareId.AsChar.decode("ascii"))
         _canlib.vciEnumDeviceClose(self._device_handle)
         _canlib.vciDeviceOpen(ctypes.byref(self._device_info.VciObjectId), ctypes.byref(self._device_handle))
         log.info("Using unique HW ID %s", self._device_info.UniqueHardwareId.AsChar)

can/interfaces/socketcan/socketcan.py

@@ -363,7 +363,7 @@ def _tx_setup(self, message):
         )
         try:
             self.bcm_socket.send(check_header)
-        except OSError as e:
+        except (socket.error, OSError) as e:
             if e.errno != errno.EINVAL:
                 raise e
         else:

can/interfaces/vector/canlib.py

@@ -387,6 +387,8 @@ def _detect_available_configs():
         channel_configs = get_channel_configs()
         LOG.info('Found %d channels', len(channel_configs))
         for channel_config in channel_configs:
+            if not channel_config.channelBusCapabilities & vxlapi.XL_BUS_ACTIVE_CAP_CAN:
+                continue
             LOG.info('Channel index %d: %s',
                      channel_config.channelIndex,
                      channel_config.name.decode('ascii'))

can/interfaces/vector/vxlapi.py

@@ -63,6 +63,7 @@
 XL_INTERFACE_VERSION = 3
 XL_INTERFACE_VERSION_V4 = 4
 
+XL_BUS_ACTIVE_CAP_CAN = XL_BUS_TYPE_CAN << 16
 XL_CHANNEL_FLAG_CANFD_ISO_SUPPORT = 0x80000000
 
 # structure for XL_RECEIVE_MSG, XL_TRANSMIT_MSG

can/message.py

@@ -53,7 +53,9 @@ def __getattr__(self, key):
         # TODO keep this for a version, in order to not break old code
         # this entire method (as well as the _dict attribute in __slots__ and the __setattr__ method)
         # can be removed in 4.0
-        # this method is only called if the attribute was not found elsewhere, like in __slots__
+        # this method is only called if the attribute was not found elsewhere, like in __slots_
+        if key not in self.__slots__:
+            raise AttributeError
         try:
             warnings.warn("Custom attributes of messages are deprecated and will be removed in 4.0", DeprecationWarning)
             return self._dict[key]
@@ -110,6 +112,7 @@ def __init__(self, timestamp=0.0, arbitration_id=0, is_extended_id=None,
         if is_extended_id is not None:
             self.is_extended_id = is_extended_id
         else:
+            # Default behaviour is to create extended id messages
             self.is_extended_id = True if extended_id is None else extended_id
 
         self.is_remote_frame = is_remote_frame

doc/configuration.rst

@@ -19,7 +19,7 @@ the **interface** and **channel** before importing from ``can.interfaces``.
     can.rc['interface'] = 'socketcan'
     can.rc['channel'] = 'vcan0'
     can.rc['bitrate'] = 500000
-    from can.interfaces.interface import Bus
+    from can.interface import Bus
 
     bus = Bus()
 

setup.py

@@ -7,6 +7,7 @@
 
 from __future__ import absolute_import
 
+import platform
 from os import listdir
 from os.path import isfile, join
 import re
@@ -26,12 +27,12 @@
 # Dependencies
 extras_require = {
     'serial':   ['pyserial~=3.0'],
-    'neovi':    ['python-ics>=2.12']
+    'neovi':    ['python-ics>=2.12', 'filelock']
 }
 
 tests_require = [
     'mock~=2.0',
-    'pytest~=4.3',
+    'pytest~=4.6',
     'pytest-timeout~=1.3',
     'pytest-cov~=2.8',
     # coveragepy==5.0 fails with `Safety level may not be changed inside a transaction`
@@ -53,7 +54,6 @@
 needs_pytest = {"pytest", "test", "ptr"}.intersection(sys.argv)
 pytest_runner = ["pytest-runner"] if needs_pytest else []
 
-
 setup(
     # Description
     name="python-can",