Fixed flusher for serverless (#50)

* Fixed flusher for serverless

* fixed flusher

* Update README.md

Co-Authored-By: Ido Halevi <32218210+idohalevi@users.noreply.github.com>

* Update README.md

Co-Authored-By: Stefan (Shalom) <imnotashrimp@users.noreply.github.com>

* Update README.md

Co-Authored-By: Stefan (Shalom) <imnotashrimp@users.noreply.github.com>

Co-authored-by: Stefan (Shalom) <imnotashrimp@users.noreply.github.com>
Co-authored-by: Ido Halevi <32218210+idohalevi@users.noreply.github.com>

README.md

@@ -69,22 +69,31 @@ format={"additional_field": "value"}
  Please note, that you have to configure those parameters by this exact order.
  i.e. you cannot set Debug to true, without configuring all of the previous parameters as well.
 
+#### Serverless platforms
+
+If you're using a serverless function, you'll need to import and add the LogzioFlusher annotation before your sender function. To do this, in the code sample below, uncomment the `import` statement and the `@LogzioFlusher(logger)` annotation line.
+
 #### Code Example
 ```python
 import logging
 import logging.config
+# If you're using a serverless function, uncomment.
+# from logzio.flusher import LogzioFlusher
 
 # Say i have saved my configuration under ./myconf.conf
 logging.config.fileConfig('myconf.conf')
 logger = logging.getLogger('superAwesomeLogzioLogger')
 
-logger.info('Test log')
-logger.warn('Warning')
+# If you're using a serverless function, uncomment.
+# @LogzioFlusher(logger)
+def my_func():
+    logger.info('Test log')
+    logger.warn('Warning')
 
-try:
-    1/0
-except:
-    logger.exception("Supporting exceptions too!")
+    try:
+        1/0
+    except:
+        logger.exception("Supporting exceptions too!")
 ```
 
 #### Extra Fields
@@ -98,6 +107,7 @@ For example:
 logger.info('Warning', extra={'extra_key':'extra_value'})
 ```
 
+
 ## Django configuration
 ```
 LOGGING = {
@@ -142,6 +152,7 @@ LOGGING = {
 }
 
 ```
+
 *Change*
 - token - Your logzio token
 - url - Logz.io Listener address
@@ -151,6 +162,8 @@ LOGGING = {
 - appname - Your django app
 
 ## Release Notes
+- 2.0.14
+    - Added flusher decorator for serverless platforms(@mcmasty)
 - 2.0.13 
     - Add support for `pypy` and `pypy3`(@rudaporto-olx)
     - Add timeout for requests.post() (@oseemann) 

logzio/flusher.py

@@ -0,0 +1,20 @@
+import functools
+import logging
+
+
+class LogzioFlusher(logging.Logger):
+
+    def __init__(self, logger):
+        self.logger = logger
+
+    def __call__(self, function):
+        @functools.wraps(function)
+        def wrapper(*args, **kwargs):
+            try:
+                return function(*args, **kwargs)
+            except Exception as e:
+                self.logger.exception('call failed: {}'.format(e))
+                raise
+            finally:
+                [h.flush() for h in self.logger.root.handlers]
+        return wrapper