LogMessage: Handle non-string messages

This will allow anyone to do logging without converting all arguments
to str every time, especially the bears can do self.debug(5).

Fixes #556

coalib/processes/communication/LogMessage.py

@@ -7,7 +7,8 @@ def __init__(self, log_level, *messages, delimiter=" "):
         if log_level not in LOG_LEVEL.reverse:
             raise ValueError("log_level has to be a valid LOG_LEVEL.")
 
-        self.message = str(delimiter).join(messages).rstrip()
+        str_messages = [str(message) for message in messages]
+        self.message = str(delimiter).join(str_messages).rstrip()
         if self.message == "":
             raise ValueError("Empty log messages are not allowed.")
 

coalib/tests/processes/communication/LogMessageTest.py

@@ -18,9 +18,9 @@ def test_construction(self):
         self.assertEqual(self.uut.message, "test message")
 
         # see that arguments are processed right
-        self.uut = LogMessage(LOG_LEVEL.WARNING, "   a msg  ")
+        self.uut = LogMessage(LOG_LEVEL.WARNING, "   a msg  ", 5, "  ")
         self.assertEqual(self.uut.log_level, LOG_LEVEL.WARNING)
-        self.assertEqual(self.uut.message, "   a msg")
+        self.assertEqual(self.uut.message, "   a msg   5")
 
         self.assertRaises(ValueError, LogMessage, LOG_LEVEL.DEBUG, "")
         self.assertRaises(ValueError, LogMessage, 5, "test")