From 82cb68ef720f48884f3209fa90e09739bcbd6ff2 Mon Sep 17 00:00:00 2001
From: Mike Shultz <mike@mikeshultz.com>
Date: Mon, 20 Nov 2023 14:03:48 -0700
Subject: [PATCH] fix: type | None is new in 3.10

---
 silverback/persistence.py |  6 +++---
 silverback/runner.py      | 10 ++++++++--
 silverback/types.py       |  6 ++++--
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/silverback/persistence.py b/silverback/persistence.py
index 2e640c47..48b1cb60 100644
--- a/silverback/persistence.py
+++ b/silverback/persistence.py
@@ -8,7 +8,7 @@
 from taskiq import TaskiqResult
 from typing_extensions import Self  # Introduced 3.11
 
-from .types import SilverbackIdent, SilverbackSettings
+from .types import IntOrNone, SilverbackIdent, SilverbackSettings
 
 
 class SilverbackState(BaseModel):
@@ -39,8 +39,8 @@ def from_taskiq(
         cls,
         ident: SilverbackIdent,
         handler_id: str,
-        block_number: int | None,
-        log_index: int | None,
+        block_number: IntOrNone,
+        log_index: IntOrNone,
         result: TaskiqResult,
     ) -> Self:
         return cls(
diff --git a/silverback/runner.py b/silverback/runner.py
index a7c51e2f..d48e00fa 100644
--- a/silverback/runner.py
+++ b/silverback/runner.py
@@ -14,7 +14,13 @@
 from .persistence import BasePersistentStorage, HandlerResult
 from .settings import Settings
 from .subscriptions import SubscriptionType, Web3SubscriptionsManager
-from .types import SilverbackIdent, SilverbackStartupState, handler_id_block, handler_id_event
+from .types import (
+    IntOrNone,
+    SilverbackIdent,
+    SilverbackStartupState,
+    handler_id_block,
+    handler_id_event,
+)
 from .utils import async_wrap_iter, hexbytes_dict
 
 settings = Settings()
@@ -32,7 +38,7 @@ def __init__(self, app: SilverbackApp, *args, max_exceptions: int = 3, **kwargs)
         self.ident = SilverbackIdent.from_settings(settings)
 
     async def _handle_result(
-        self, handler_id: str, block_number: int | None, log_index: int | None, result: TaskiqResult
+        self, handler_id: str, block_number: IntOrNone, log_index: IntOrNone, result: TaskiqResult
     ):
         if result.is_err:
             self.exceptions += 1
diff --git a/silverback/types.py b/silverback/types.py
index 17be0040..5db10ccb 100644
--- a/silverback/types.py
+++ b/silverback/types.py
@@ -1,8 +1,10 @@
-from typing import Optional, Protocol
+from typing import Optional, Protocol, Union
 
 from pydantic import BaseModel
 from typing_extensions import Self  # Introduced 3.11
 
+StrOrNone = Union[str, None]  # For Python < 3.10
+
 
 class SilverbackSettings(Protocol):
     INSTANCE: str
@@ -34,7 +36,7 @@ def handler_id_block(block_number: Optional[int]) -> str:
     return f"block/{block_number}"
 
 
-def handler_id_event(contract_address: str | None, event_signature: str) -> str:
+def handler_id_event(contract_address: StrOrNone, event_signature: str) -> str:
     """Return a unique handler ID string for an event"""
     # TODO: Under what circumstance can address be None?
     return f"event/{contract_address or 'unknown'}/{event_signature}"