Add a restart mechanism to all workers in the multiplexer (#2622)

sanic/worker/multiplexer.py

@@ -21,9 +21,14 @@ class WorkerMultiplexer:
             "state": ProcessState.ACKED.name,
         }
 
-    def restart(self, name: str = ""):
+    def restart(self, name: str = "", all_workers: bool = False):
+        if name and all_workers:
+            raise ValueError(
+                "Ambiguous restart with both a named process and"
+                " all_workers=True"
+            )
         if not name:
-            name = self.name
+            name = "__ALL_PROCESSES__:" if all_workers else self.name
         self._monitor_publisher.send(name)
 
     reload = restart  # no cov

tests/worker/test_multiplexer.py

@@ -1,6 +1,6 @@
 from multiprocessing import Event
 from os import environ, getpid
-from typing import Any, Dict
+from typing import Any, Dict, Type, Union
 from unittest.mock import Mock
 
 import pytest
@@ -117,3 +117,26 @@ def test_properties(
     assert m.workers == worker_state
     assert m.state == worker_state["Test"]
     assert isinstance(m.state, WorkerState)
+
+
+@pytest.mark.parametrize(
+    "params,expected",
+    (
+        ({}, "Test"),
+        ({"name": "foo"}, "foo"),
+        ({"all_workers": True}, "__ALL_PROCESSES__:"),
+        ({"name": "foo", "all_workers": True}, ValueError),
+    ),
+)
+def test_restart_params(
+    monitor_publisher: Mock,
+    m: WorkerMultiplexer,
+    params: Dict[str, Any],
+    expected: Union[str, Type[Exception]],
+):
+    if isinstance(expected, str):
+        m.restart(**params)
+        monitor_publisher.send.assert_called_once_with(expected)
+    else:
+        with pytest.raises(expected):
+            m.restart(**params)