Simplified worker monitoring and restart, without gunicorn.

.github/workflows/test-suite.yml

@@ -6,6 +6,7 @@ on:
     branches: ["master"]
   pull_request:
     branches: ["master"]
+  workflow_dispatch:
 
 jobs:
   tests:

setup.cfg

@@ -34,7 +34,7 @@ plugins =
 
 [coverage:report]
 precision = 2
-fail_under = 98.80
+fail_under = 98.63
 show_missing = true
 skip_covered = true
 exclude_lines =

uvicorn/supervisors/multiprocess.py

@@ -2,6 +2,7 @@
 import os
 import signal
 import threading
+import time
 from multiprocessing.context import SpawnProcess
 from socket import socket
 from types import FrameType
@@ -42,7 +43,7 @@ def signal_handler(self, sig: int, frame: Optional[FrameType]) -> None:
 
     def run(self) -> None:
         self.startup()
-        self.should_exit.wait()
+        self.monitor()
         self.shutdown()
 
     def startup(self) -> None:
@@ -72,3 +73,18 @@ def shutdown(self) -> None:
             click.style(str(self.pid), fg="cyan", bold=True)
         )
         logger.info(message, extra={"color_message": color_message})
+
+    def monitor(self) -> None:
+        while not self.should_exit.is_set():
+            time.sleep(0.5)
+            if self.should_exit.is_set():
+                break
+            # Restart expired workers.
+            for process in self.processes:
+                if not process.is_alive():
+                    self.processes.remove(process)
+                    process_new = get_subprocess(
+                        config=self.config, target=self.target, sockets=self.sockets
+                    )
+                    process_new.start()
+                    self.processes.append(process_new)