fix: improve the error message for exceptions during fetching contrac…

…t types from explorer (#2169)

src/ape/managers/chain.py

@@ -1044,8 +1044,7 @@ def get(
             # In this case, it at least _looked_ like an address.
             return None
 
-        contract_type = self._local_contract_types.get(address_key)
-        if contract_type:
+        if contract_type := self._local_contract_types.get(address_key):
             if default and default != contract_type:
                 # Replacing contract type
                 self._local_contract_types[address_key] = default
@@ -1060,8 +1059,7 @@ def get(
 
             return default
 
-        contract_type = self._get_contract_type_from_disk(address_key)
-        if not contract_type:
+        if not (contract_type := self._get_contract_type_from_disk(address_key)):
             # Contract could be a minimal proxy
             proxy_info = self._local_proxies.get(address_key) or self._get_proxy_info_from_disk(
                 address_key
@@ -1330,7 +1328,22 @@ def _get_contract_type_from_explorer(self, address: AddressType) -> Optional[Con
         try:
             contract_type = self._network.explorer.get_contract_type(address)
         except Exception as err:
-            logger.error(f"Unable to fetch contract type at '{address}' from explorer.\n{err}")
+            explorer_name = self._network.explorer.name
+            if "rate limit" in str(err).lower():
+                # Don't show any additional error message during rate limit errors,
+                # if it can be helped, as it may scare users into thinking their
+                # contracts are not verified.
+                message = str(err)
+            else:
+                # Carefully word this message in a way that doesn't hint at
+                # any one specific reason, such as un-verified source code,
+                # which is potentially a scare for users.
+                message = (
+                    f"Attempted to retrieve contract type from explorer '{explorer_name}' "
+                    f"from address '{address}' but encountered an exception: {err}\n"
+                )
+
+            logger.error(message)
             return None
 
         if contract_type:

tests/functional/conftest.py

@@ -717,18 +717,28 @@ def mock_compile(paths, project=None, settings=None):
 
 
 @pytest.fixture
-def mock_sepolia(ethereum, eth_tester_provider, vyper_contract_instance):
+def mock_sepolia(create_mock_sepolia):
     """
     Temporarily tricks Ape into thinking the local network
     is Sepolia so we can test features that require a live
     network.
     """
-    # Ensuring contract exists before hack.
-    # This allow the network to be past genesis which is more realistic.
-    _ = vyper_contract_instance
-    eth_tester_provider.network.name = "sepolia"
-    yield eth_tester_provider.network
-    eth_tester_provider.network.name = LOCAL_NETWORK_NAME
+    with create_mock_sepolia() as network:
+        yield network
+
+
+@pytest.fixture
+def create_mock_sepolia(ethereum, eth_tester_provider, vyper_contract_instance):
+    @contextmanager
+    def fn():
+        # Ensuring contract exists before hack.
+        # This allow the network to be past genesis which is more realistic.
+        _ = vyper_contract_instance
+        eth_tester_provider.network.name = "sepolia"
+        yield eth_tester_provider.network
+        eth_tester_provider.network.name = LOCAL_NETWORK_NAME
+
+    return fn
 
 
 @pytest.fixture

tests/functional/test_contracts_cache.py

@@ -61,10 +61,15 @@ def fn(addr, default=None):
 
         return existing_fn(addr, default=default)
 
-    chain.contracts.get = mocker.MagicMock()
-    chain.contracts.get.side_effect = fn
+    original_get = chain.contracts.get
+    mock_get = mocker.MagicMock()
+    mock_get.side_effect = fn
+    chain.contracts.get = mock_get
+    try:
+        actual = chain.contracts.instance_at(new_address, contract_type=expected_contract_type)
+    finally:
+        chain.contracts.get = original_get
 
-    actual = chain.contracts.instance_at(new_address, contract_type=expected_contract_type)
     ape_caplog.assert_last_log(expected_fail_message)
     assert actual.contract_type == expected_contract_type
 
@@ -275,7 +280,7 @@ def test_get_multiple_no_addresses(chain, caplog):
     assert "No addresses provided." in caplog.messages[-1]
 
 
-def test_get_all_include_non_contract_address(vyper_contract_instance, chain, owner):
+def test_get_multiple_include_non_contract_address(vyper_contract_instance, chain, owner):
     actual = chain.contracts.get_multiple((vyper_contract_instance.address, owner.address))
     assert len(actual) == 1
     assert actual[vyper_contract_instance.address] == vyper_contract_instance.contract_type
@@ -298,6 +303,99 @@ def test_get_attempts_to_convert(chain):
         chain.contracts.get("test.eth2")
 
 
+@explorer_test
+def test_get_attempts_explorer(
+    mock_explorer, create_mock_sepolia, chain, owner, vyper_fallback_container
+):
+    contract = owner.deploy(vyper_fallback_container)
+
+    def get_contract_type(addr):
+        if addr == contract.address:
+            return contract.contract_type
+
+        raise ValueError("nope")
+
+    # Hack in a way to publish on this local network.
+    with create_mock_sepolia() as network:
+        mock_explorer.get_contract_type.side_effect = get_contract_type
+        network.__dict__["explorer"] = mock_explorer
+        del chain.contracts[contract.address]
+        try:
+            actual = chain.contracts.get(contract.address)
+        finally:
+            network.__dict__["explorer"] = None
+
+        assert actual == contract.contract_type
+        assert mock_explorer.get_contract_type.call_count > 0
+        mock_explorer.get_contract_type.reset_mock()
+
+
+@explorer_test
+def test_get_attempts_explorer_logs_errors_from_explorer(
+    mock_explorer, create_mock_sepolia, chain, owner, vyper_fallback_container, ape_caplog
+):
+    contract = owner.deploy(vyper_fallback_container)
+    check_error_str = "__CHECK_FOR_THIS_ERROR__"
+
+    def get_contract_type(addr):
+        if addr == contract.address:
+            raise ValueError(check_error_str)
+
+        raise ValueError("nope")
+
+    with create_mock_sepolia() as network:
+        mock_explorer.get_contract_type.side_effect = get_contract_type
+        network.__dict__["explorer"] = mock_explorer
+        expected_log = (
+            f"Attempted to retrieve contract type from explorer 'mock' "
+            f"from address '{contract.address}' but encountered an "
+            f"exception: {check_error_str}"
+        )
+        del chain.contracts[contract.address]
+        try:
+            actual = chain.contracts.get(contract.address)
+        finally:
+            network.__dict__["explorer"] = None
+
+        assert expected_log in ape_caplog.head
+        assert actual is None
+        mock_explorer.get_contract_type.reset_mock()
+
+
+@explorer_test
+def test_get_attempts_explorer_logs_rate_limit_error_from_explorer(
+    mock_explorer, create_mock_sepolia, chain, owner, vyper_fallback_container, ape_caplog
+):
+    contract = owner.deploy(vyper_fallback_container)
+
+    # Ensure is not cached locally.
+    del chain.contracts[contract.address]
+
+    check_error_str = "you have been rate limited"
+
+    def get_contract_type(addr):
+        if addr == contract.address:
+            raise ValueError(check_error_str)
+
+        raise ValueError("nope")
+
+    with create_mock_sepolia() as network:
+        mock_explorer.get_contract_type.side_effect = get_contract_type
+        network.__dict__["explorer"] = mock_explorer
+
+        # For rate limit errors, we don't show anything else,
+        # as it may be confusing.
+        expected_log = "you have been rate limited"
+        try:
+            actual = chain.contracts.get(contract.address)
+        finally:
+            network.__dict__["explorer"] = None
+
+        assert expected_log in ape_caplog.head
+        assert actual is None
+        mock_explorer.get_contract_type.reset_mock()
+
+
 def test_cache_non_checksum_address(chain, vyper_contract_instance):
     """
     When caching a non-checksum address, it should use its checksum