moved decryption logic and simplified it a bit

.gitignore

@@ -3,6 +3,7 @@
 .tox
 .cache
 .venv
+.history
 *.egg-info
 /.project
 /.pydevproject

dsmr_parser/parsers.py

@@ -32,6 +32,7 @@ class TelegramParser(object):
             object["obis_reference"]: re.compile(object["obis_reference"], re.DOTALL | re.MULTILINE)
             for object in self.telegram_specification['objects']
         }
+        self._telegram_encryption_active = None
 
     def parse(self, telegram_data, encryption_key="", authentication_key="", throw_ex=False):  # noqa: C901
         """
@@ -46,38 +47,11 @@ class TelegramParser(object):
         :raises ParseError:
         :raises InvalidChecksumError:
         """
-
-        if "general_global_cipher" in self.telegram_specification:
-            if self.telegram_specification["general_global_cipher"]:
-                enc_key = unhexlify(encryption_key)
-                auth_key = unhexlify(authentication_key)
-                telegram_data = unhexlify(telegram_data)
-                apdu = XDlmsApduFactory.apdu_from_bytes(apdu_bytes=telegram_data)
-                if apdu.security_control.security_suite != 0:
-                    logger.warning("Untested security suite")
-                if apdu.security_control.authenticated and not apdu.security_control.encrypted:
-                    logger.warning("Untested authentication only")
-                if not apdu.security_control.authenticated and not apdu.security_control.encrypted:
-                    logger.warning("Untested not encrypted or authenticated")
-                if apdu.security_control.compressed:
-                    logger.warning("Untested compression")
-                if apdu.security_control.broadcast_key:
-                    logger.warning("Untested broadcast key")
-                telegram_data = apdu.to_plain_apdu(enc_key, auth_key).decode("ascii")
-            else:
-                try:
-                    if unhexlify(telegram_data[0:2])[0] == GeneralGlobalCipher.TAG:
-                        raise RuntimeError("Looks like a general_global_cipher frame "
-                                           "but telegram specification is not matching!")
-                except Exception:
-                    pass
-        else:
-            try:
-                if unhexlify(telegram_data[0:2])[0] == GeneralGlobalCipher.TAG:
-                    raise RuntimeError(
-                        "Looks like a general_global_cipher frame but telegram specification is not matching!")
-            except Exception:
-                pass
+        telegram_data = self.decrypt_telegram_data(
+            telegram_data=telegram_data,
+            encryption_key=encryption_key,
+            authentication_key=authentication_key
+        )
 
         if self.apply_checksum_validation and self.telegram_specification['checksum_support']:
             self.validate_checksum(telegram_data)
@@ -112,6 +86,42 @@ class TelegramParser(object):
 
         return telegram
 
+    def decrypt_telegram_data(self, encryption_key, authentication_key, telegram_data):
+        """
+        Check if telegram data is encrypted and decrypt if applicable.
+        """
+        # if self._telegram_encryption_active is False:
+        #     # If encryption is not working, stop trying and logging warnings.
+        #     return telegram_data
+
+        if self.telegram_specification.get("general_global_cipher"):
+            enc_key = unhexlify(encryption_key)
+            auth_key = unhexlify(authentication_key)
+            telegram_data = unhexlify(telegram_data)
+            apdu = XDlmsApduFactory.apdu_from_bytes(apdu_bytes=telegram_data)
+            if apdu.security_control.security_suite != 0:
+                logger.warning("Untested security suite")
+            if apdu.security_control.authenticated and not apdu.security_control.encrypted:
+                logger.warning("Untested authentication only")
+            if not apdu.security_control.authenticated and not apdu.security_control.encrypted:
+                logger.warning("Untested not encrypted or authenticated")
+            if apdu.security_control.compressed:
+                logger.warning("Untested compression")
+            if apdu.security_control.broadcast_key:
+                logger.warning("Untested broadcast key")
+            telegram_data = apdu.to_plain_apdu(enc_key, auth_key).decode("ascii")
+            self._telegram_encryption_active = True
+        else:
+            try:
+                if unhexlify(telegram_data[0:2])[0] == GeneralGlobalCipher.TAG:
+                    logger.warning("Looks like a general_global_cipher frame "
+                                   "but telegram specification is not matching!")
+            except Exception:
+                pass
+            self._telegram_encryption_active = False
+
+        return telegram_data
+
     @staticmethod
     def validate_checksum(telegram):
         """

test/clients/test_filereader.py

@@ -0,0 +1,21 @@
+import unittest
+import tempfile
+
+from dsmr_parser.clients.filereader import FileReader
+from dsmr_parser.telegram_specifications import V5
+from test.example_telegrams import TELEGRAM_V5
+
+
+class FileReaderTest(unittest.TestCase):
+    def test_read_as_object(self):
+        with tempfile.NamedTemporaryFile() as file:
+            with open(file.name, "w") as f:
+                f.write(TELEGRAM_V5)
+
+            telegrams = []
+            reader = FileReader(file=file.name, telegram_specification=V5)
+            # Call
+            for telegram in reader.read_as_object():
+                telegrams.append(telegram)
+
+            self.assertEqual(len(telegrams), 1)

test/clients/test_rfxtrx_protocol.py

@@ -0,0 +1,77 @@
+from unittest.mock import Mock
+
+import unittest
+
+from dsmr_parser import obis_references as obis
+from dsmr_parser.clients.rfxtrx_protocol import create_rfxtrx_dsmr_protocol, PACKETTYPE_DSMR, SUBTYPE_P1
+from dsmr_parser.objects import Telegram
+
+TELEGRAM_V2_2 = (
+    '/ISk5\2MT382-1004\r\n'
+    '\r\n'
+    '0-0:96.1.1(00000000000000)\r\n'
+    '1-0:1.8.1(00001.001*kWh)\r\n'
+    '1-0:1.8.2(00001.001*kWh)\r\n'
+    '1-0:2.8.1(00001.001*kWh)\r\n'
+    '1-0:2.8.2(00001.001*kWh)\r\n'
+    '0-0:96.14.0(0001)\r\n'
+    '1-0:1.7.0(0001.01*kW)\r\n'
+    '1-0:2.7.0(0000.00*kW)\r\n'
+    '0-0:17.0.0(0999.00*kW)\r\n'
+    '0-0:96.3.10(1)\r\n'
+    '0-0:96.13.1()\r\n'
+    '0-0:96.13.0()\r\n'
+    '0-1:24.1.0(3)\r\n'
+    '0-1:96.1.0(000000000000)\r\n'
+    '0-1:24.3.0(161107190000)(00)(60)(1)(0-1:24.2.1)(m3)\r\n'
+    '(00001.001)\r\n'
+    '0-1:24.4.0(1)\r\n'
+    '!\r\n'
+)
+
+OTHER_RF_PACKET = b'\x03\x01\x02\x03'
+
+
+def encode_telegram_as_RF_packets(telegram):
+    data = b''
+
+    for line in telegram.split('\n'):
+        packet_data = (line + '\n').encode('ascii')
+        packet_header = bytes(bytearray([
+            len(packet_data) + 3,  # excluding length byte
+            PACKETTYPE_DSMR,
+            SUBTYPE_P1,
+            0  # seq num (ignored)
+        ]))
+
+        data += packet_header + packet_data
+        # other RF packets can pass by on the line
+        data += OTHER_RF_PACKET
+
+    return data
+
+
+class RFXtrxProtocolTest(unittest.TestCase):
+
+    def setUp(self):
+        new_protocol, _ = create_rfxtrx_dsmr_protocol('2.2',
+                                                      telegram_callback=Mock(),
+                                                      keep_alive_interval=1)
+        self.protocol = new_protocol()
+
+    def test_complete_packet(self):
+        """Protocol should assemble incoming lines into complete packet."""
+
+        data = encode_telegram_as_RF_packets(TELEGRAM_V2_2)
+        # send data broken up in two parts
+        self.protocol.data_received(data[0:200])
+        self.protocol.data_received(data[200:])
+
+        telegram = self.protocol.telegram_callback.call_args_list[0][0][0]
+        assert isinstance(telegram, Telegram)
+
+        assert float(telegram[obis.CURRENT_ELECTRICITY_USAGE].value) == 1.01
+        assert telegram[obis.CURRENT_ELECTRICITY_USAGE].unit == 'kW'
+
+        assert float(telegram[obis.GAS_METER_READING].value) == 1.001
+        assert telegram[obis.GAS_METER_READING].unit == 'm3'

test/test_parse_v5.py

@@ -21,7 +21,7 @@ class TelegramParserV5Test(unittest.TestCase):
             telegram = parser.parse(TELEGRAM_V5, throw_ex=True)
         except Exception as ex:
             assert False, f"parse trigged an exception {ex}"
-        print('test: ', type(telegram.P1_MESSAGE_HEADER), telegram.P1_MESSAGE_HEADER.__dict__)
+
         # P1_MESSAGE_HEADER (1-3:0.2.8)
         assert isinstance(telegram.P1_MESSAGE_HEADER, CosemObject)
         assert telegram.P1_MESSAGE_HEADER.unit is None