fix(vdu): vdu number of instances now is taking into account. Bug 1477
[osm/NBI.git] / osm_nbi / subscriptions.py
index 8132fe9..ec70d0c 100644 (file)
@@ -24,10 +24,12 @@ import logging
 import threading
 import asyncio
 from http import HTTPStatus
+
 from osm_common import dbmongo, dbmemory, msglocal, msgkafka
 from osm_common.dbbase import DbException
 from osm_common.msgbase import MsgException
-from engine import EngineException
+from osm_nbi.engine import EngineException
+from osm_nbi.notifications import NsLcmNotification
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
 
@@ -48,20 +50,73 @@ class SubscriptionThread(threading.Thread):
         :param engine: an instance of Engine class, used for deleting instances
         """
         threading.Thread.__init__(self)
-
+        self.to_terminate = False
         self.config = config
         self.db = None
         self.msg = None
         self.engine = engine
         self.loop = None
         self.logger = logging.getLogger("nbi.subscriptions")
-        self.aiomain_task = None  # asyncio task for receiving kafka bus
+        self.aiomain_task_admin = None  # asyncio task for receiving admin actions from kafka bus
+        self.aiomain_task = None  # asyncio task for receiving normal actions from kafka bus
         self.internal_session = {  # used for a session to the engine methods
-            "_id": "subscription",
-            "id": "subscription",
-            "project_id": "admin",
-            "admin": True
+            "project_id": (),
+            "set_project": (),
+            "admin": True,
+            "force": False,
+            "public": None,
+            "method": "delete",
         }
+        self.nslcm = None
+
+    async def start_kafka(self):
+        # timeout_wait_for_kafka = 3*60
+        kafka_working = True
+        while not self.to_terminate:
+            try:
+                # bug 710 635. The library aiokafka does not recieve anything when the topci at kafka has not been
+                # created.
+                # Before subscribe, send dummy messages
+                await self.msg.aiowrite("admin", "echo", "dummy message", loop=self.loop)
+                await self.msg.aiowrite("ns", "echo", "dummy message", loop=self.loop)
+                await self.msg.aiowrite("nsi", "echo", "dummy message", loop=self.loop)
+                if not kafka_working:
+                    self.logger.critical("kafka is working again")
+                    kafka_working = True
+                if not self.aiomain_task_admin:
+                    await asyncio.sleep(10, loop=self.loop)
+                    self.logger.debug("Starting admin subscription task")
+                    self.aiomain_task_admin = asyncio.ensure_future(self.msg.aioread(("admin",), loop=self.loop,
+                                                                                     group_id=False,
+                                                                                     aiocallback=self._msg_callback),
+                                                                    loop=self.loop)
+                if not self.aiomain_task:
+                    await asyncio.sleep(10, loop=self.loop)
+                    self.logger.debug("Starting non-admin subscription task")
+                    self.aiomain_task = asyncio.ensure_future(self.msg.aioread(("ns", "nsi"), loop=self.loop,
+                                                                               aiocallback=self._msg_callback),
+                                                              loop=self.loop)
+                done, _ = await asyncio.wait([self.aiomain_task, self.aiomain_task_admin],
+                                             timeout=None, loop=self.loop, return_when=asyncio.FIRST_COMPLETED)
+                try:
+                    if self.aiomain_task_admin in done:
+                        exc = self.aiomain_task_admin.exception()
+                        self.logger.error("admin subscription task exception: {}".format(exc))
+                        self.aiomain_task_admin = None
+                    if self.aiomain_task in done:
+                        exc = self.aiomain_task.exception()
+                        self.logger.error("non-admin subscription task exception: {}".format(exc))
+                        self.aiomain_task = None
+                except asyncio.CancelledError:
+                    pass
+            except Exception as e:
+                if self.to_terminate:
+                    return
+                if kafka_working:
+                    # logging only first time
+                    self.logger.critical("Error accessing kafka '{}'. Retrying ...".format(e))
+                    kafka_working = False
+            await asyncio.sleep(10, loop=self.loop)
 
     def run(self):
         """
@@ -92,27 +147,26 @@ class SubscriptionThread(threading.Thread):
                 else:
                     raise SubscriptionException("Invalid configuration param '{}' at '[message]':'driver'".format(
                         config_msg["driver"]))
-
+            self.nslcm = NsLcmNotification(self.db)
         except (DbException, MsgException) as e:
             raise SubscriptionException(str(e), http_code=e.http_code)
 
         self.logger.debug("Starting")
-        while True:
+        while not self.to_terminate:
             try:
-                self.aiomain_task = asyncio.ensure_future(self.msg.aioread(("ns", "nsi"), loop=self.loop,
-                                                                           callback=self._msg_callback),
-                                                          loop=self.loop)
-                self.loop.run_until_complete(self.aiomain_task)
-            except asyncio.CancelledError:
-                break  # if cancelled it should end, breaking loop
+
+                self.loop.run_until_complete(asyncio.ensure_future(self.start_kafka(), loop=self.loop))
+            # except asyncio.CancelledError:
+            #     break  # if cancelled it should end, breaking loop
             except Exception as e:
-                self.logger.exception("Exception '{}' at messaging read loop".format(e), exc_info=True)
+                if not self.to_terminate:
+                    self.logger.exception("Exception '{}' at messaging read loop".format(e), exc_info=True)
 
         self.logger.debug("Finishing")
         self._stop()
         self.loop.close()
 
-    def _msg_callback(self, topic, command, params):
+    async def _msg_callback(self, topic, command, params):
         """
         Callback to process a received message from kafka
         :param topic:  topic received
@@ -120,21 +174,67 @@ class SubscriptionThread(threading.Thread):
         :param params: rest of parameters
         :return: None
         """
+        msg_to_send = []
         try:
             if topic == "ns":
                 if command == "terminated" and params["operationState"] in ("COMPLETED", "PARTIALLY_COMPLETED"):
                     self.logger.debug("received ns terminated {}".format(params))
                     if params.get("autoremove"):
-                        self.engine.del_item(self.internal_session, "nsrs", _id=params["nsr_id"])
+                        self.engine.del_item(self.internal_session, "nsrs", _id=params["nsr_id"],
+                                             not_send_msg=msg_to_send)
                         self.logger.debug("ns={} deleted from database".format(params["nsr_id"]))
-                    return
-            if topic == "nsi":
+                # Check for nslcm notification
+                if isinstance(params, dict):
+                    # Check availability of operationState and command
+                    if (not params.get("operationState")) or (not command) or (not params.get("operationParams")):
+                        self.logger.debug("Message can not be used for notification of nslcm")
+                    else:
+                        nsd_id = params["operationParams"].get("nsdId")
+                        ns_instance_id = params["operationParams"].get("nsInstanceId")
+                        # Any one among nsd_id, ns_instance_id should be present.
+                        if not (nsd_id or ns_instance_id):
+                            self.logger.debug("Message can not be used for notification of nslcm")
+                        else:
+                            op_state = params["operationState"]
+                            event_details = {"topic": topic, "command": command.upper(), "params": params}
+                            subscribers = self.nslcm.get_subscribers(nsd_id, ns_instance_id, command.upper(), op_state,
+                                                                     event_details)
+                            # self.logger.debug("subscribers list: ")
+                            # self.logger.debug(subscribers)
+                            if subscribers:
+                                asyncio.ensure_future(self.nslcm.send_notifications(subscribers, loop=self.loop),
+                                                      loop=self.loop)
+                else:
+                    self.logger.debug("Message can not be used for notification of nslcm")
+            elif topic == "nsi":
                 if command == "terminated" and params["operationState"] in ("COMPLETED", "PARTIALLY_COMPLETED"):
                     self.logger.debug("received nsi terminated {}".format(params))
                     if params.get("autoremove"):
-                        self.engine.del_item(self.internal_session, "nsis", _id=params["nsir_id"])
+                        self.engine.del_item(self.internal_session, "nsis", _id=params["nsir_id"],
+                                             not_send_msg=msg_to_send)
                         self.logger.debug("nsis={} deleted from database".format(params["nsir_id"]))
-                    return
+            elif topic == "admin":
+                self.logger.debug("received {} {} {}".format(topic, command, params))
+                if command in ["echo", "ping"]:   # ignored commands
+                    pass
+                elif command == "revoke_token":
+                    if params:
+                        if isinstance(params, dict) and "_id" in params:
+                            tid = params.get("_id")
+                            self.engine.authenticator.tokens_cache.pop(tid, None)
+                            self.logger.debug("token '{}' removed from token_cache".format(tid))
+                        else:
+                            self.logger.debug("unrecognized params in command '{} {}': {}"
+                                              .format(topic, command, params))
+                    else:
+                        self.engine.authenticator.tokens_cache.clear()
+                        self.logger.debug("token_cache cleared")
+                else:
+                    self.logger.debug("unrecognized command '{} {}'".format(topic, command))
+            # writing to kafka must be done with our own loop. For this reason it is not allowed Engine to do that,
+            # but content to be written is stored at msg_to_send
+            for msg in msg_to_send:
+                await self.msg.aiowrite(*msg, loop=self.loop)
         except (EngineException, DbException, MsgException) as e:
             self.logger.error("Error while processing topic={} command={}: {}".format(topic, command, e))
         except Exception as e:
@@ -160,4 +260,8 @@ class SubscriptionThread(threading.Thread):
         but not immediately.
         :return: None
         """
-        self.loop.call_soon_threadsafe(self.aiomain_task.cancel)
+        self.to_terminate = True
+        if self.aiomain_task:
+            self.loop.call_soon_threadsafe(self.aiomain_task.cancel)
+        if self.aiomain_task_admin:
+            self.loop.call_soon_threadsafe(self.aiomain_task_admin.cancel)