Implement Graceful Shutdown for Worker Process

This commit adds robust shutdown handling for the PodcastItLater
worker process. Key improvements include:

- Introduce ShutdownHandler to manage graceful signal handling -
Add checkpoints in job processing to support interruption - Reset
stale jobs stuck in processing state on startup - Modify systemd
service configuration for better process management - Implement
interruptible sleep in main loop - Ensure current job can complete
or be reset during shutdown

1 files changed, 6 insertions, 1 deletions

diff --git a/Biz/PodcastItLater/Worker.nix b/Biz/PodcastItLater/Worker.nix
index eafc95a..974a3ba 100644
--- a/Biz/PodcastItLater/Worker.nix
+++ b/Biz/PodcastItLater/Worker.nix
@@ -48,10 +48,15 @@ in {
           "DATA_DIR=${cfg.dataDir}"
         ];
         EnvironmentFile = "/run/podcastitlater/worker-env";
-        KillSignal = "INT";
+        KillSignal = "TERM";
+        KillMode = "mixed";
         Type = "simple";
         Restart = "always";
         RestartSec = "10";
+        # Give the worker time to finish current job
+        TimeoutStopSec = "300"; # 5 minutes
+        # Send SIGTERM first, then SIGKILL after timeout
+        SendSIGKILL = "yes";
       };
     };
   };