move logging to separate thread

passbook/lib/log.py

@@ -0,0 +1,38 @@
+from atexit import register
+from logging.config import ConvertingDict, ConvertingList, valid_ident
+from logging.handlers import QueueHandler, QueueListener
+from queue import Queue
+
+from django.conf import settings
+
+
+def _resolve_handlers(l):
+    # import pudb; pu.db
+    if not isinstance(l, ConvertingList):
+        return l
+
+    # Indexing the list performs the evaluation.
+    return [l[i] for i in range(len(l))]
+
+
+class QueueListenerHandler(QueueHandler):
+
+    def __init__(self, handlers, respect_handler_level=False, auto_run=True, queue=Queue(-1)):
+        super().__init__(queue)
+        handlers = _resolve_handlers(handlers)
+        self._listener = QueueListener(
+            self.queue,
+            *handlers,
+            respect_handler_level=respect_handler_level)
+        if auto_run:
+            self.start()
+            register(self.stop)
+
+    def start(self):
+        self._listener.start()
+
+    def stop(self):
+        self._listener.stop()
+
+    def emit(self, record):
+        return super().emit(record)