cic-eth: Address translator task

apps/cic-eth/cic_eth/ext/address.py

@@ -0,0 +1,43 @@
+# standard imports
+import logging
+
+# third-party imports
+import celery
+from cic_registry.chain import ChainSpec
+from cic_registry import CICRegistry
+
+celery_app = celery.current_app
+
+logg = logging.getLogger()
+
+
+def translate_address(address, trusted_addresses, chain_spec):
+    for trusted_address in trusted_addresses:
+        o = CICRegistry.get_contract(chain_spec, 'AddressDeclarator', 'Declarator')
+        fn = o.function('declaration')
+        declaration_hex = fn(trusted_address, address).call()
+        declaration_bytes = declaration_hex[0].rstrip(b'\x00')
+        declaration = None
+        try:
+            declaration = declaration_bytes.decode('utf-8', errors='strict')
+        except UnicodeDecodeError:
+            continue
+        return declaration
+
+
+@celery_app.task()
+def translate_tx_addresses(tx, trusted_addresses, chain_str):
+
+    chain_spec = ChainSpec.from_chain_str(chain_str)
+
+    declaration = None
+    if tx['sender_label'] == None:
+        declaration = translate_address(tx['sender'], trusted_addresses, chain_spec)
+    tx['sender_label'] = declaration
+
+    declaration = None
+    if tx['recipient_label'] == None:
+        declaration = translate_address(tx['recipient'], trusted_addresses, chain_spec)
+    tx['recipient_label'] = declaration
+
+    return tx