fix: PoA detect and add amoy

ape_alchemy/provider.py

@@ -18,8 +18,11 @@
 from requests import HTTPError
 from web3 import HTTPProvider, Web3
 from web3.exceptions import ContractLogicError as Web3ContractLogicError
+from web3.exceptions import ExtraDataLengthError
 from web3.gas_strategies.rpc import rpc_gas_price_strategy
 from web3.middleware import geth_poa_middleware
+from web3.middleware import geth_poa_middleware as ExtraDataToPOAMiddleware
+from web3.middleware.validation import MAX_EXTRADATA_LENGTH
 from web3.types import RPCEndpoint
 
 from .exceptions import AlchemyFeatureNotAvailable, AlchemyProviderError, MissingProjectKeyError
@@ -119,19 +122,44 @@ def connection_str(self) -> str:
 
     def connect(self):
         self._web3 = Web3(HTTPProvider(self.uri))
+        is_poa = None
         try:
             # Any chain that *began* as PoA needs the middleware for pre-merge blocks
             base = 8453
             optimism = 10
             polygon = 137
+            polygon_amoy = 80002
 
-            if self._web3.eth.chain_id in (base, optimism, polygon):
+            if self._web3.eth.chain_id in (base, optimism, polygon, polygon_amoy):
                 self._web3.middleware_onion.inject(geth_poa_middleware, layer=0)
+                is_poa = True
 
             self._web3.eth.set_gas_price_strategy(rpc_gas_price_strategy)
         except Exception as err:
             raise ProviderError(f"Failed to connect to Alchemy.\n{repr(err)}") from err
 
+        if is_poa is None:
+            # Check if is PoA but just wasn't as such yet.
+            # NOTE: We have to check both earliest and latest
+            #   because if the chain was _ever_ PoA, we need
+            #   this middleware.
+            for option in ("earliest", "latest"):
+                try:
+                    block = self.web3.eth.get_block(option)  # type: ignore[arg-type]
+                except ExtraDataLengthError:
+                    is_poa = True
+                    break
+                else:
+                    is_poa = (
+                        "proofOfAuthorityData" in block
+                        or len(block.get("extraData", "")) > MAX_EXTRADATA_LENGTH
+                    )
+                    if is_poa:
+                        break
+
+            if is_poa and ExtraDataToPOAMiddleware not in self.web3.middleware_onion:
+                self.web3.middleware_onion.inject(ExtraDataToPOAMiddleware, layer=0)
+
     def disconnect(self):
         self._web3 = None
 

tests/test_integration.py

@@ -21,6 +21,7 @@ def test_http(provider):
     assert provider.http_uri.startswith("https")
     assert provider.get_balance(ZERO_ADDRESS) > 0
     assert provider.get_block(0)
+    assert provider.get_block("latest")
 
 
 def test_ws(provider):