Refactor Sourcify Client

- Rename `Sourcify` to `SourcifyClient`
- Add method to check networks not supported
- Raise a `SourcifyClientConfigurationProblem` if network is not supported

docs/source/gnosis.eth.clients.rst

@@ -28,10 +28,10 @@ gnosis.eth.clients.etherscan\_client module
    :undoc-members:
    :show-inheritance:
 
-gnosis.eth.clients.sourcify module
+gnosis.eth.clients.sourcify_client module
 ----------------------------------
 
-.. automodule:: gnosis.eth.clients.sourcify
+.. automodule:: gnosis.eth.clients.sourcify_client
    :members:
    :undoc-members:
    :show-inheritance:

gnosis/eth/clients/__init__.py

@@ -11,16 +11,22 @@
     EtherscanClientException,
     EtherscanRateLimitError,
 )
-from .sourcify import Sourcify
+from .sourcify_client import (
+    SourcifyClient,
+    SourcifyClientConfigurationProblem,
+    SourcifyClientException,
+)
 
 __all__ = [
+    "BlockScoutConfigurationProblem",
     "BlockscoutClient",
     "BlockscoutClientException",
-    "BlockScoutConfigurationProblem",
     "ContractMetadata",
     "EtherscanClient",
     "EtherscanClientConfigurationProblem",
     "EtherscanClientException",
     "EtherscanRateLimitError",
-    "Sourcify",
+    "SourcifyClient",
+    "SourcifyClientConfigurationProblem",
+    "SourcifyClientException",
 ]

gnosis/eth/clients/sourcify.py → gnosis/eth/clients/sourcify_client.py

@@ -3,12 +3,22 @@
 
 import requests
 
+from gnosis.util import cache
+
 from .. import EthereumNetwork
 from ..utils import fast_is_checksum_address
 from .contract_metadata import ContractMetadata
 
 
-class Sourcify:
+class SourcifyClientException(Exception):
+    pass
+
+
+class SourcifyClientConfigurationProblem(Exception):
+    pass
+
+
+class SourcifyClient:
     """
     Get contract metadata from Sourcify. Matches can be full or partial:
 
@@ -31,6 +41,11 @@ def __init__(
         self.http_session = self._prepare_http_session()
         self.request_timeout = request_timeout
 
+        if not self.is_chain_supported(network.value):
+            raise SourcifyClientConfigurationProblem(
+                f"Network {network.name} - {network.value} not supported"
+            )
+
     def _prepare_http_session(self) -> requests.Session:
         """
         Prepare http session with custom pooling. See:
@@ -63,6 +78,13 @@ def _do_request(self, url: str) -> Optional[Dict[str, Any]]:
 
         return response.json()
 
+    def is_chain_supported(self, chain_id: int) -> bool:
+        return chain_id in (int(chain["chainId"]) for chain in self.get_chains())
+
+    @cache
+    def get_chains(self) -> Dict[str, Any]:
+        return self._do_request("https://sourcify.dev/server/chains")
+
     def get_contract_metadata(
         self, contract_address: str
     ) -> Optional[ContractMetadata]:

gnosis/eth/tests/clients/test_sourcify.py → gnosis/eth/tests/clients/test_sourcify_client.py

@@ -3,12 +3,27 @@
 from django.test import TestCase
 
 from ... import EthereumNetwork
-from ...clients import Sourcify
+from ...clients import SourcifyClient
+from ...clients.sourcify_client import SourcifyClientConfigurationProblem
 
 
-class TestSourcify(TestCase):
-    def test_sourcify_get_contract_metadata(self):
-        sourcify = Sourcify()
+class TestSourcifyClient(TestCase):
+    def test_init(self):
+        with self.assertRaises(SourcifyClientConfigurationProblem):
+            SourcifyClient(EthereumNetwork.OLYMPIC)
+
+        self.assertIsInstance(SourcifyClient(), SourcifyClient)
+        self.assertIsInstance(SourcifyClient(EthereumNetwork.GNOSIS), SourcifyClient)
+
+    def test_is_chain_supported(self):
+        sourcify = SourcifyClient()
+
+        self.assertTrue(sourcify.is_chain_supported(EthereumNetwork.MAINNET.value))
+        self.assertTrue(sourcify.is_chain_supported(EthereumNetwork.GNOSIS.value))
+        self.assertFalse(sourcify.is_chain_supported(2))
+
+    def test_get_contract_metadata(self):
+        sourcify = SourcifyClient()
         safe_contract_address = "0x6851D6fDFAfD08c0295C392436245E5bc78B0185"
         try:
             contract_metadata = sourcify.get_contract_metadata(safe_contract_address)
@@ -18,7 +33,7 @@ def test_sourcify_get_contract_metadata(self):
         self.assertIsInstance(contract_metadata.abi, List)
         self.assertTrue(contract_metadata.abi)
         self.assertFalse(contract_metadata.partial_match)
-        contract_metadata_rinkeby = Sourcify(
+        contract_metadata_rinkeby = SourcifyClient(
             EthereumNetwork.RINKEBY
         ).get_contract_metadata(safe_contract_address)
         self.assertEqual(contract_metadata, contract_metadata_rinkeby)