Better exception handling

Author: Yard1

redis/asyncio/cluster.py

@@ -1515,7 +1515,7 @@ async def _execute(
         allow_redirections: bool = True,
     ) -> List[Any]:
         todo = [
-            cmd for cmd in stack if not cmd.result or isinstance(cmd.result, Exception)
+            cmd for cmd in stack if not cmd.unwrap_result() or cmd.get_all_exceptions()
         ]
 
         nodes = {}
@@ -1548,18 +1548,22 @@ async def _execute(
             if allow_redirections:
                 # send each errored command individually
                 for cmd in todo:
-                    if isinstance(cmd.result, (TryAgainError, MovedError, AskError)):
-                        try:
-                            result = await client.execute_command(
-                                *cmd.args, **cmd.kwargs
-                            )
-                        except Exception as e:
-                            result = e
+                    for name, exc in cmd.get_all_exceptions():
+                        if isinstance(exc, (TryAgainError, MovedError, AskError)):
+                            try:
+                                result = await client.execute_command(
+                                    *cmd.args, **cmd.kwargs
+                                )
+                            except Exception as e:
+                                result = e
 
-                        if isinstance(result, dict):
-                            cmd.result = result
-                        else:
-                            cmd.set_node_result(cmd.target_nodes[0].name, result)
+                            if isinstance(result, dict):
+                                cmd.result = result
+                            else:
+                                cmd.set_node_result(name, result)
+
+                            # We have already retried the command on all nodes.
+                            break
 
             if raise_on_error:
                 for cmd in todo:
@@ -1583,11 +1587,16 @@ async def _execute(
                 # to replace it.
                 # Note: when the error is raised we'll reset the default node in the
                 # caller function.
+                has_exc = False
                 for cmd in default_node[1]:
                     # Check if it has a command that failed with a relevant
                     # exception
-                    if type(cmd.result) in self.__class__.ERRORS_ALLOW_RETRY:
-                        client.replace_default_node()
+                    for name, exc in cmd.get_all_exceptions():
+                        if type(exc) in self.__class__.ERRORS_ALLOW_RETRY:
+                            client.replace_default_node()
+                            has_exc = True
+                            break
+                    if has_exc:
                         break
 
         return [cmd.unwrap_result() for cmd in stack]
@@ -1649,5 +1658,8 @@ def get_first_exception(self) -> Optional[Tuple[str, Exception]]:
             ((n, r) for n, r in self.result.items() if isinstance(r, Exception)), None
         )
 
+    def get_all_exceptions(self) -> List[Tuple[str, Exception]]:
+        return [(n, r) for n, r in self.result.items() if isinstance(r, Exception)]
+
     def __repr__(self) -> str:
         return f"[{self.position}] {self.args} ({self.kwargs})"