Use better json formatting

Apply json.dumps at the end of the formatting process instead of the
middle.  This allows for proper escaping of quotes and allows for
actual json to be emitted.

lbrynet/core/log_support.py

@@ -112,19 +112,30 @@ def get_loggly_url(token=None, version=None):
 @_log_decorator
 def configure_loggly_handler(url=None, **kwargs):
     url = url or get_loggly_url()
-    json_format = {
-        "loggerName": "%(name)s",
-        "asciTime": "%(asctime)s",
-        "fileName": "%(filename)s",
-        "functionName": "%(funcName)s",
-        "levelNo": "%(levelno)s",
-        "lineNo": "%(lineno)d",
-        "levelName": "%(levelname)s",
-        "message": "%(message)s",
-    }
-    json_format.update(kwargs)
-    formatter = logging.Formatter(json.dumps(json_format))
+    formatter = JsonFormatter(**kwargs)
     handler = HTTPSHandler(url)
     handler.setFormatter(formatter)
     handler.name = 'loggly'
     return handler
+
+
+class JsonFormatter(logging.Formatter):
+    """Format log records using json serialization"""
+    def __init__(self, **kwargs):
+        self.attributes = kwargs
+
+    def format(self, record):
+        data = {
+            'loggerName': record.name,
+            'asciTime': self.formatTime(record),
+            'fileName': record.filename,
+            'functionName': record.funcName,
+            'levelNo': record.levelno,
+            'lineNo': record.lineno,
+            'levelName': record.levelname,
+            'message': record.getMessage(),
+        }
+        data.update(self.attributes)
+        if record.exc_info:
+            data['exc_info'] = self.formatException(record.exc_info)
+        return json.dumps(data)

lbrynet/lbrynet_daemon/Daemon.py

@@ -1034,7 +1034,6 @@ class Daemon(jsonrpc.JSONRPC):
             session_id=self._session_id
         )
 
-
     def _setup_lbry_file_manager(self):
         self.startup_status = STARTUP_STAGES[3]
         self.lbry_file_metadata_manager = DBEncryptedFileMetadataManager(self.db_dir)