logging documentation

Author: SteadBytes

doc/index.rst

@@ -51,6 +51,7 @@ Flask-RESTPlus with Flask.
     errors
     mask
     swagger
+    logging
     postman
     scaling
     example

doc/logging.rst

@@ -0,0 +1,103 @@
+Logging
+===============
+
+Flask-RESTPlus extends `Flask's logging <https://flask.palletsprojects.com/en/1.1.x/logging/>`_
+by providing each ``API`` and ``Namespace`` it's own standard Python :class:`logging.Logger` instance.
+This allows separation of logging on a per namespace basis to allow more fine-grained detail and configuration.
+
+By default, these loggers inherit configuration from the Flask application object logger.
+
+.. code-block:: python
+
+    import logging
+
+    import flask
+
+    from flask_restplus import Api, Resource
+
+    # configure root logger
+    logging.basicConfig(level=logging.INFO)
+
+    app = flask.Flask(__name__)
+
+    api = Api(app)
+
+
+    # each of these loggers uses configuration from app.logger
+    ns1 = api.namespace('api/v1', description='test')
+    ns2 = api.namespace('api/v2', description='test')
+
+
+    @ns1.route('/my-resource')
+    class MyResource(Resource):
+        def get(self):
+            # will log
+            ns1.logger.info("hello from ns1")
+            return {"message": "hello"}
+
+
+    @ns2.route('/my-resource')
+    class MyNewResource(Resource):
+        def get(self):
+            # won't log due to INFO log level from app.logger
+            ns2.logger.debug("hello from ns2")
+            return {"message": "hello"}
+
+
+Loggers can be configured individually to override the configuration from the Flask
+application object logger. In the above example, ``ns2`` log level can be set to
+``DEBUG`` individually:
+
+.. code-block:: python
+
+    # ns1 will have log level INFO from app.logger
+    ns1 = api.namespace('api/v1', description='test')
+
+    # ns2 will have log level DEBUG
+    ns2 = api.namespace('api/v2', description='test')
+    ns2.logger.setLevel(logging.DEBUG)
+
+
+    @ns1.route('/my-resource')
+    class MyResource(Resource):
+        def get(self):
+            # will log
+            ns1.logger.info("hello from ns1")
+            return {"message": "hello"}
+
+
+    @ns2.route('/my-resource')
+    class MyNewResource(Resource):
+        def get(self):
+            # will log
+            ns2.logger.debug("hello from ns2")
+            return {"message": "hello"}
+
+
+Adding additional handlers:
+
+
+.. code-block:: python
+
+    # configure a file handler for ns1 only
+    ns1 = api.namespace('api/v1')
+    fh = logging.FileHandler("v1.log")
+    ns1.logger.addHandler(fh)
+
+    ns2 = api.namespace('api/v2')
+
+
+    @ns1.route('/my-resource')
+    class MyResource(Resource):
+        def get(self):
+            # will log to *both* v1.log file and app.logger handlers
+            ns1.logger.info("hello from ns1")
+            return {"message": "hello"}
+
+
+    @ns2.route('/my-resource')
+    class MyNewResource(Resource):
+        def get(self):
+            # will log to *only* app.logger handlers
+            ns2.logger.info("hello from ns2")
+            return {"message": "hello"}