Add subclass of bugout provider for memPool data.

backend/moonstream/providers/bugout.py

@@ -96,19 +96,6 @@ class BugoutEventProvider:
             is_query_constrained and self.event_type not in query.subscription_types
         ) or not relevant_subscriptions:
             return None
-
-        if self.event_type == "ethereum_txpool":
-            addresses = [
-                subscription.resource_data["address"]
-                for subscription in relevant_subscriptions
-            ]
-            subscriptions_filters = []
-            for adress in addresses:
-                subscriptions_filters.extend(
-                    [f"?#from_address:{adress}", f"?#to_address:{adress}"]
-                )
-
-            return subscriptions_filters
         return []
 
     def get_events(
@@ -282,10 +269,46 @@ class BugoutEventProvider:
         return self.entry_event(search_results.results[0])
 
 
+class BugoutMemPoolProvider(BugoutEventProvider):
+    def __init__(
+        self,
+        event_type: str,
+        tags: Optional[List[str]] = None,
+        batch_size: int = 100,
+        timeout: float = 30.0,
+    ):
+
+        super().__init__(event_type, tags, batch_size, timeout)
+
+    def parse_filters(
+        self, query: StreamQuery, user_subscriptions: Dict[str, List[BugoutResource]]
+    ) -> Optional[List[str]]:
+
+        is_query_constrained = query.subscription_types or query.subscriptions
+        relevant_subscriptions = user_subscriptions.get(self.event_type)
+
+        if (
+            is_query_constrained and self.event_type not in query.subscription_types
+        ) or not relevant_subscriptions:
+            return None
+        addresses = [
+            subscription.resource_data["address"]
+            for subscription in relevant_subscriptions
+        ]
+        subscriptions_filters = []
+        for adress in addresses:
+            subscriptions_filters.extend(
+                [f"?#from_address:{adress}", f"?#to_address:{adress}"]
+            )
+
+        return subscriptions_filters
+
+
 whalewatch_provider = BugoutEventProvider(
     event_type="ethereum_whalewatch", tags=["crawl_type:ethereum_trending"]
 )
 
-ethereum_txpool_provider = BugoutEventProvider(
+
+ethereum_txpool_provider = BugoutMemPoolProvider(
     event_type="ethereum_txpool", tags=["client:ethereum-txpool-crawler-0"]
 )