New clear and flush to file support in memory logger

src/quorum/log.py

@@ -190,6 +190,10 @@ def emit(self, record):
             messages_s = len(_messages_l)
             if messages_s > self.max_length: _messages_l.pop()
 
+    def clear(self):
+        self.messages = collections.deque()
+        self.messages_l = dict()
+
     def get_latest(self, count = None, level = None):
         count = count or 100
         is_level = level and not legacy.is_string(level)
@@ -200,6 +204,17 @@ def get_latest(self, count = None, level = None):
         slice = itertools.islice(messages, 0, count)
         return list(slice)
 
+    def flush_to_file(self, path, count = None, level = None, clear = True):
+        messages = self.get_latest(level = level, count = count or 65536)
+        if not messages: return
+        file = open(path, "wb")
+        try:
+            for message in messages:
+                file.write(message + "\n")
+        finally:
+            file.close()
+        if clear: self.clear()
+
 class BaseFormatter(logging.Formatter):
     """
     The base Quorum logging formatted used to add some extra