Merge pull request #1009 from eth-brownie/fix-caching-filter

Ensure node client supports filters before adding cache middleware
eth-brownie · Mar 21, 2021 · ce603c5 · ce603c5
2 parents 3aea24c + 2e3586d
commit ce603c5
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/brownie/network/middlewares/caching.py b/brownie/network/middlewares/caching.py
@@ -111,6 +111,12 @@ def __init__(self, w3: Web3) -> None:
     @classmethod
     def get_layer(cls, w3: Web3, network_type: str) -> Optional[int]:
         if network_type == "live":
+            try:
+                # ensure that the node client supports filters
+                block_filter = w3.eth.filter("latest")
+                block_filter.get_new_entries()
+            except ValueError:
+                return None
             return 0
         else:
             return None