Updated changelog

Pass exception to log.exception as it is not called from within an ex…

.travis.yml

@@ -2,9 +2,9 @@ language: python
 
 python:
   - 2.7
-  - 3.4
   - 3.5
   - 3.6
+  - 3.8
   
 install: pip install tox-travis codecov
 

CHANGELOG.rst

@@ -1,5 +1,10 @@
 Change Log
 ----------
+**0.22** (2020-08-23)
+
+- CRC check speed is improved
+- Exception info improvement
+
 **0.21** (2020-05-25)
 
 - All objects can produce a json serialization of their state.

dsmr_parser/clients/protocol.py

@@ -95,7 +95,7 @@ class DSMRProtocol(asyncio.Protocol):
     def connection_lost(self, exc):
         """Stop when connection is lost."""
         if exc:
-            self.log.exception('disconnected due to exception')
+            self.log.exception('disconnected due to exception', exc_info=exc)
         else:
             self.log.info('disconnected because of close/abort.')
         self._closed.set()

dsmr_parser/parsers.py

@@ -11,6 +11,8 @@ logger = logging.getLogger(__name__)
 
 class TelegramParser(object):
 
+    crc16_tab = []
+
     def __init__(self, telegram_specification, apply_checksum_validation=True):
         """
         :param telegram_specification: determines how the telegram is parsed
@@ -93,24 +95,28 @@ class TelegramParser(object):
 
     @staticmethod
     def crc16(telegram):
-        crc16_tab = []
-
-        for i in range(0, 256):
-            crc = c_ushort(i).value
-            for j in range(0, 8):
-                if (crc & 0x0001):
-                    crc = c_ushort(crc >> 1).value ^ 0xA001
-                else:
-                    crc = c_ushort(crc >> 1).value
-            crc16_tab.append(hex(crc))
+        """
+        Calculate the CRC16 value for the given telegram
 
+        :param str telegram:
+        """
         crcValue = 0x0000
 
+        if len(TelegramParser.crc16_tab) == 0:
+            for i in range(0, 256):
+                crc = c_ushort(i).value
+                for j in range(0, 8):
+                    if (crc & 0x0001):
+                        crc = c_ushort(crc >> 1).value ^ 0xA001
+                    else:
+                        crc = c_ushort(crc >> 1).value
+                TelegramParser.crc16_tab.append(hex(crc))
+
         for c in telegram:
             d = ord(c)
             tmp = crcValue ^ d
             rotated = c_ushort(crcValue >> 8).value
-            crcValue = rotated ^ int(crc16_tab[(tmp & 0x00ff)], 0)
+            crcValue = rotated ^ int(TelegramParser.crc16_tab[(tmp & 0x00ff)], 0)
 
         return crcValue
 

setup.py

@@ -6,7 +6,7 @@ setup(
     author='Nigel Dokter',
     author_email='nigel@nldr.net',
     url='https://github.com/ndokter/dsmr_parser',
-    version='0.21',
+    version='0.22',
     packages=find_packages(),
     install_requires=[
         'pyserial>=3,<4',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py35,py36,py37
+envlist = py35,py36,py37,py38
 
 [testenv]
 deps=