diff --git a/changelog.d/15993.misc b/changelog.d/15993.misc
new file mode 100644
index 0000000000..35ead05157
--- /dev/null
+++ b/changelog.d/15993.misc
@@ -0,0 +1 @@
+Allow modules to schedule delayed background calls.
\ No newline at end of file
diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py
index ba1a925003..acee1dafd3 100644
--- a/synapse/module_api/__init__.py
+++ b/synapse/module_api/__init__.py
@@ -34,6 +34,7 @@ import jinja2
from typing_extensions import ParamSpec
from twisted.internet import defer
+from twisted.internet.interfaces import IDelayedCall
from twisted.web.resource import Resource
from synapse.api import errors
@@ -1242,6 +1243,46 @@ class ModuleApi:
"""
return self._hs.config.worker.run_background_tasks
+ def delayed_background_call(
+ self,
+ msec: float,
+ f: Callable,
+ *args: object,
+ desc: Optional[str] = None,
+ **kwargs: object,
+ ) -> IDelayedCall:
+ """Wraps a function as a background process and calls it in a given number of milliseconds.
+
+ The scheduled call is not persistent: if the current Synapse instance is
+ restarted before the call is made, the call will not be made.
+
+ Added in Synapse v1.90.0.
+
+ Args:
+ msec: How long to wait before calling, in milliseconds.
+ f: The function to call once. f can be either synchronous or
+ asynchronous, and must follow Synapse's logcontext rules.
+ More info about logcontexts is available at
+ https://matrix-org.github.io/synapse/latest/log_contexts.html
+ *args: Positional arguments to pass to function.
+ desc: The background task's description. Default to the function's name.
+ **kwargs: Keyword arguments to pass to function.
+
+ Returns:
+ IDelayedCall handle from twisted, which allows to cancel the delayed call if desired.
+ """
+
+ if desc is None:
+ desc = f.__name__
+
+ return self._clock.call_later(
+ # convert ms to seconds as needed by call_later.
+ msec * 0.001,
+ run_as_background_process,
+ desc,
+ lambda: maybe_awaitable(f(*args, **kwargs)),
+ )
+
async def sleep(self, seconds: float) -> None:
"""Sleeps for the given number of seconds.
|
