From 9c462f18a4b6969f627349d956b9161968ab8252 Mon Sep 17 00:00:00 2001
From: reivilibre <oliverw@matrix.org>
Date: Thu, 3 Aug 2023 12:42:19 +0000
Subject: [PATCH] Allow modules to check whether the current worker is
 configured to run background tasks. (#15991)

---
 changelog.d/15991.misc         |  1 +
 synapse/module_api/__init__.py | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 changelog.d/15991.misc

diff --git a/changelog.d/15991.misc b/changelog.d/15991.misc
new file mode 100644
index 0000000000..18f388cff8
--- /dev/null
+++ b/changelog.d/15991.misc
@@ -0,0 +1 @@
+Allow modules to check whether the current worker is configured to run background tasks.
\ No newline at end of file
diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py
index 95f7800111..ba1a925003 100644
--- a/synapse/module_api/__init__.py
+++ b/synapse/module_api/__init__.py
@@ -1230,6 +1230,18 @@ class ModuleApi:
                 f,
             )
 
+    def should_run_background_tasks(self) -> bool:
+        """
+        Return true if and only if the current worker is configured to run
+        background tasks.
+        There should only be one worker configured to run background tasks, so
+        this is helpful when you need to only run a task on one worker but don't
+        have any other good way to choose which one.
+
+        Added in Synapse v1.89.0.
+        """
+        return self._hs.config.worker.run_background_tasks
+
     async def sleep(self, seconds: float) -> None:
         """Sleeps for the given number of seconds.