Support Marker in python logging

1 Add 'Marker' feature which carry extra contextual
information for loggers, can be used to mark a single log
statement
2 Make MDC Formatter have "marker" label.

Change-Id: I21ac547b97c49190393d57ff290dcbc3ae20da2a
Issue-ID: MULTICLOUD-328
Signed-off-by: liangke <lokyse@163.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/pylog/onaplogging/marker/markerFactory.py b/pylog/onaplogging/marker/markerFactory.py
new file mode 100644
index 0000000..deb9566
--- /dev/null
+++ b/pylog/onaplogging/marker/markerFactory.py
@@ -0,0 +1,74 @@
+# Copyright 2018 ke liang <lokyse@163.com>.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import abc
+import threading
+from marker import BaseMarker
+
+lock = threading.RLock()
+
+
+class IMarkerFactory(object):
+    __metaclass__ = abc.ABCMeta
+
+    @abc.abstractmethod
+    def getMarker(self, marker_name=None):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def deleteMarker(self, marker_name=None):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def exist(self, marker_name=None):
+        raise NotImplementedError()
+
+
+class MarkerFactory(IMarkerFactory):
+
+    _instance = None
+    _marker_map = {}
+
+    def __new__(cls, *args, **kwargs):
+
+        if cls._instance is None:
+            cls._instance = super(MarkerFactory, cls).__new__(cls)
+
+        return cls._instance
+
+    def getMarker(self, marker_name=None):
+        if marker_name is None:
+            raise ValueError("not empty")
+
+        marker = self._marker_map.get(marker_name, None)
+        if marker is None:
+            lock.acquire()
+            marker = BaseMarker(name=marker_name)
+            self._marker_map[marker_name] = marker
+            lock.release()
+
+        return marker
+
+    def deleteMarker(self, marker_name=None):
+        lock.acquire()
+        if self.exist(marker_name):
+            del self._marker_map[marker_name]
+            return True
+        lock.release()
+        return False
+
+    def exist(self, marker_name=None):
+
+        return self._marker_map.get(
+            marker_name, None) is not None