Introduce batching to MISP feed output bot

intelmq/bots/outputs/misp/output_feed.py

@@ -8,6 +8,7 @@
 from pathlib import Path
 from uuid import uuid4
 import re
+import redis
 
 from intelmq.lib.bot import OutputBot
 from intelmq.lib.exceptions import MissingDependencyError
@@ -35,6 +36,12 @@ class MISPFeedOutputBot(OutputBot):
     misp_org_name = None
     misp_org_uuid = None
     output_dir: str = "/opt/intelmq/var/lib/bots/mispfeed-output"  # TODO: should be path
+    queue_db: int = 2
+    queue_host: str = "localhost"
+    queue_name: str = None
+    queue_password: str = None
+    queue_port: int = 6379
+    batch_size: int = 100
     _is_multithreadable: bool = False
 
     @staticmethod
@@ -45,6 +52,13 @@ def check_output_dir(dirname):
             return True
 
     def init(self):
+        # Set up redis connection for length checks
+        if not self.queue_name:
+            self.queue_name = self.source_queue
+        self.redis = self.connect_redis()
+
+        self.event_batch = []
+
         if MISPEvent is None and import_fail_reason == 'syntax':
             raise MissingDependencyError("pymisp",
                                          version='>=2.4.117.3',
@@ -105,21 +119,40 @@ def process(self):
 
         event = self.receive_message().to_dict(jsondict_as_string=True)
 
-        obj = self.current_event.add_object(name='intelmq_event')
-        for object_relation, value in event.items():
-            try:
-                obj.add_attribute(object_relation, value=value)
-            except NewAttributeError:
-                # This entry isn't listed in the harmonization file, ignoring.
-                pass
+        current_queue_len = self.redis.llen(self.queue_name)
+        if current_queue_len % self.batch_size == 0:
+            self.flush_batch()
+        else:
+            self.event_batch.append(event)
+
+        self.acknowledge_message()
+
+    def connect_redis(self):
+        return redis.Redis(
+            host=self.queue_host,
+            port=self.queue_port,
+            db=self.queue_db,
+            password=self.queue_password,
+        )
+
+    def flush_batch(self):
+        for event in self.event_batch:
+            obj = self.current_event.add_object(name='intelmq_event')
+            for object_relation, value in event.items():
+                try:
+                    obj.add_attribute(object_relation, value=value)
+                except NewAttributeError:
+                    # This entry isn't listed in the harmonization file, ignoring.
+                    pass
 
         feed_output = self.current_event.to_feed(with_meta=False)
 
         with self.current_file.open('w') as f:
             json.dump(feed_output, f)
 
         feed_meta_generator(self.output_dir)
-        self.acknowledge_message()
+
+        self.event_batch.clear()
 
     @staticmethod
     def check(parameters):