Added pycrypto dependency. Adding callback to msglocal aioread method

Change-Id: Ib651d2b1d9cfcb95914892bcac2aca55dd55c367
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/debian/python3-osm-common.postinst b/debian/python3-osm-common.postinst
index a877e58..658ef23 100755
--- a/debian/python3-osm-common.postinst
+++ b/debian/python3-osm-common.postinst
@@ -24,6 +24,7 @@
 pip3 install --upgrade aiokafka==0.4.*
 pip3 install --upgrade pymongo==3.7.*
 pip3 install --upgrade pyyaml==3.*
+# pip3 install pycrypto   added as dependency: python3-crypto
 
 #Creation of log folder
 mkdir -p /var/log/osm
diff --git a/osm_common/msglocal.py b/osm_common/msglocal.py
index 247de7b..b0abb89 100644
--- a/osm_common/msglocal.py
+++ b/osm_common/msglocal.py
@@ -116,7 +116,7 @@
         except Exception as e:  # TODO refine
             raise MsgException(str(e), HTTPStatus.INTERNAL_SERVER_ERROR)
 
-    async def aioread(self, topic, loop):
+    async def aioread(self, topic, loop=None, callback=None, aiocallback=None, **kwargs):
         """
         Asyncio read from one or several topics. It blocks
         :param topic: can be str: single topic; or str list: several topics
@@ -127,7 +127,12 @@
             while True:
                 msg = self.read(topic, blocks=False)
                 if msg:
-                    return msg
+                    if callback:
+                        callback(*msg, **kwargs)
+                    elif aiocallback:
+                        await aiocallback(*msg, **kwargs)
+                    else:
+                        return msg
                 await asyncio.sleep(2, loop=loop)
         except MsgException:
             raise
diff --git a/setup.py b/setup.py
index 22525b4..25e36fd 100644
--- a/setup.py
+++ b/setup.py
@@ -48,5 +48,6 @@
         'pymongo',
         'aiokafka',
         'PyYAML',
+        'pycrypto',
     ],
 )