Speed up init and finish flow (#117226)

Since every flow now has to check for single config entry, change
the check to see if a config entry exists first before calling
the _support_single_config_entry_only since _support_single_config_entry_only
has to load the integration which adds up quite a bit in test runs

homeassistant/config_entries.py

@@ -1198,8 +1198,8 @@ async def async_init(
         # a single config entry, but which already has an entry
         if (
             context.get("source") not in {SOURCE_IGNORE, SOURCE_REAUTH, SOURCE_UNIGNORE}
+            and self.config_entries.async_has_entries(handler, include_ignore=False)
             and await _support_single_config_entry_only(self.hass, handler)
-            and self.config_entries.async_entries(handler, include_ignore=False)
         ):
             return ConfigFlowResult(
                 type=data_entry_flow.FlowResultType.ABORT,
@@ -1303,9 +1303,9 @@ async def async_finish_flow(
         # Avoid adding a config entry for a integration
         # that only supports a single config entry, but already has an entry
         if (
-            await _support_single_config_entry_only(self.hass, flow.handler)
+            self.config_entries.async_has_entries(flow.handler, include_ignore=False)
+            and await _support_single_config_entry_only(self.hass, flow.handler)
             and flow.context["source"] != SOURCE_IGNORE
-            and self.config_entries.async_entries(flow.handler, include_ignore=False)
         ):
             return ConfigFlowResult(
                 type=data_entry_flow.FlowResultType.ABORT,
@@ -1344,10 +1344,9 @@ async def async_finish_flow(
                 await flow.async_set_unique_id(None)
 
             # Find existing entry.
-            for check_entry in self.config_entries.async_entries(result["handler"]):
-                if check_entry.unique_id == flow.unique_id:
-                    existing_entry = check_entry
-                    break
+            existing_entry = self.config_entries.async_entry_for_domain_unique_id(
+                result["handler"], flow.unique_id
+            )
 
         # Unload the entry before setting up the new one.
         # We will remove it only after the other one is set up,
@@ -1574,6 +1573,21 @@ def async_entry_ids(self) -> list[str]:
         """Return entry ids."""
         return list(self._entries.data)
 
+    @callback
+    def async_has_entries(
+        self, domain: str, include_ignore: bool = True, include_disabled: bool = True
+    ) -> bool:
+        """Return if there are entries for a domain."""
+        entries = self._entries.get_entries_for_domain(domain)
+        if include_ignore and include_disabled:
+            return bool(entries)
+        return any(
+            entry
+            for entry in entries
+            if (include_ignore or entry.source != SOURCE_IGNORE)
+            and (include_disabled or not entry.disabled_by)
+        )
+
     @callback
     def async_entries(
         self,

tests/test_config_entries.py

@@ -692,6 +692,13 @@ async def test_entries_excludes_ignore_and_disabled(
         entry3,
         disabled_entry,
     ]
+    assert manager.async_has_entries("test") is True
+    assert manager.async_has_entries("test2") is True
+    assert manager.async_has_entries("test3") is True
+    assert manager.async_has_entries("ignored") is True
+    assert manager.async_has_entries("disabled") is True
+
+    assert manager.async_has_entries("not") is False
     assert manager.async_entries(include_ignore=False) == [
         entry,
         entry2a,
@@ -712,6 +719,10 @@ async def test_entries_excludes_ignore_and_disabled(
         entry2b,
         entry3,
     ]
+    assert manager.async_has_entries("test", include_ignore=False) is True
+    assert manager.async_has_entries("test2", include_ignore=False) is True
+    assert manager.async_has_entries("test3", include_ignore=False) is True
+    assert manager.async_has_entries("ignored", include_ignore=False) is False
 
     assert manager.async_entries(include_ignore=True) == [
         entry,
@@ -737,6 +748,10 @@ async def test_entries_excludes_ignore_and_disabled(
         entry3,
         disabled_entry,
     ]
+    assert manager.async_has_entries("test", include_disabled=False) is True
+    assert manager.async_has_entries("test2", include_disabled=False) is True
+    assert manager.async_has_entries("test3", include_disabled=False) is True
+    assert manager.async_has_entries("disabled", include_disabled=False) is False
 
 
 async def test_saving_and_loading(