fix in dbmemory query using '.cont' and '.ncont'

[osm/common.git] / osm_common / msgkafka.py

diff --git a/osm_common/msgkafka.py b/osm_common/msgkafka.py
index 2d82f97..1e22c9f 100644 (file)
--- a/osm_common/msgkafka.py
+++ b/osm_common/msgkafka.py
@@ -1,3 +1,18 @@
+# -*- coding: utf-8 -*-
+
+# 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 logging
 import asyncio
 import yaml
@@ -5,21 +20,21 @@ from aiokafka import AIOKafkaConsumer
 from aiokafka import AIOKafkaProducer
 from aiokafka.errors import KafkaError
 from osm_common.msgbase import MsgBase, MsgException
-# import json
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>, " \
              "Guillermo Calvino <guillermo.calvinosanchez@altran.com>"
 
 
 class MsgKafka(MsgBase):
-    def __init__(self, logger_name='msg'):
-        self.logger = logging.getLogger(logger_name)
+    def __init__(self, logger_name='msg', lock=False):
+        super().__init__(logger_name, lock)
         self.host = None
         self.port = None
         self.consumer = None
         self.producer = None
         self.loop = None
         self.broker = None
+        self.group_id = None
 
     def connect(self, config):
         try:
@@ -27,8 +42,9 @@ class MsgKafka(MsgBase):
                 self.logger = logging.getLogger(config["logger_name"])
             self.host = config["host"]
             self.port = config["port"]
-            self.loop = asyncio.get_event_loop()
+            self.loop = config.get("loop") or asyncio.get_event_loop()
             self.broker = str(self.host) + ":" + str(self.port)
+            self.group_id = config.get("group_id")
 
         except Exception as e:  # TODO refine
             raise MsgException(str(e))
@@ -68,6 +84,14 @@ class MsgKafka(MsgBase):
             raise MsgException("Error reading {} topic: {}".format(topic, str(e)))
 
     async def aiowrite(self, topic, key, msg, loop=None):
+        """
+        Asyncio write
+        :param topic: str kafka topic
+        :param key: str kafka key
+        :param msg: str or dictionary  kafka message
+        :param loop: asyncio loop. To be DEPRECATED! in near future!!!  loop must be provided inside config at connect
+        :return: None
+        """
 
         if not loop:
             loop = self.loop
@@ -81,33 +105,43 @@ class MsgKafka(MsgBase):
         finally:
             await self.producer.stop()
 
-    async def aioread(self, topic, loop=None, callback=None, *args):
+    async def aioread(self, topic, loop=None, callback=None, aiocallback=None, group_id=None, **kwargs):
         """
-        Asyncio read from one or several topics. It blocks
+        Asyncio read from one or several topics.
         :param topic: can be str: single topic; or str list: several topics
-        :param loop: asyncio loop
-        :callback: callback function that will handle the message in kafka bus
-        :*args: optional arguments for callback function
-        :return: topic, key, message
+        :param loop: asyncio loop. To be DEPRECATED! in near future!!!  loop must be provided inside config at connect
+        :param callback: synchronous callback function that will handle the message in kafka bus
+        :param aiocallback: async callback function that will handle the message in kafka bus
+        :param group_id: kafka group_id to use. Can be False (set group_id to None), None (use general group_id provided
+                         at connect inside config), or a group_id string
+        :param kwargs: optional keyword arguments for callback function
+        :return: If no callback defined, it returns (topic, key, message)
         """
 
         if not loop:
             loop = self.loop
+        if group_id is False:
+            group_id = None
+        elif group_id is None:
+            group_id = self.group_id
         try:
             if isinstance(topic, (list, tuple)):
                 topic_list = topic
             else:
                 topic_list = (topic,)
 
-            self.consumer = AIOKafkaConsumer(loop=loop, bootstrap_servers=self.broker)
+            self.consumer = AIOKafkaConsumer(loop=loop, bootstrap_servers=self.broker, group_id=group_id)
             await self.consumer.start()
             self.consumer.subscribe(topic_list)
 
             async for message in self.consumer:
                 if callback:
-                    callback(message.topic, yaml.load(message.key), yaml.load(message.value), *args)
+                    callback(message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value), **kwargs)
+                elif aiocallback:
+                    await aiocallback(message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value),
+                                      **kwargs)
                 else:
-                    return message.topic, yaml.load(message.key), yaml.load(message.value)
+                    return message.topic, yaml.safe_load(message.key), yaml.safe_load(message.value)
         except KafkaError as e:
             raise MsgException(str(e))
         finally: