switched rover <-> server streams to rtsptcp, and moved mediamtx to be a server owned and configured child process!

server/src/services/mediaMtxService/index.js

@@ -0,0 +1,46 @@
+// MediaMTX Service
+// Purpose: Composes server configuration, runtime paths, and child-process supervision.
+// Scope: Starts MediaMTX only after the HTTP auth endpoint is listening and stops it with the server.
+const { loadConfig } = require('../../helpers/configLoader');
+const globalConfig = require('../../globals/config');
+const logger = require('../../globals/logger').child('mediamtx');
+const { createMediaMtxSupervisor } = require('./supervisor');
+
+const supervisor = createMediaMtxSupervisor({
+  config: loadConfig(),
+  serverPort: globalConfig.port,
+  logger,
+});
+
+function startMediaMtx() {
+  return supervisor.start();
+}
+
+/*
+  Other services already use process signal hooks for their own workers. This hook performs
+  only synchronous signal delivery; systemd's default control-group cleanup remains the final
+  guarantee if the parent is killed before the child finishes exiting.
+*/
+process.once('exit', () => supervisor.stop());
+
+function stopForSignal(signal) {
+  let completed = false;
+  const finish = () => {
+    if (completed) return;
+    completed = true;
+    process.exit(signal === 'SIGINT' ? 130 : 143);
+  };
+
+  supervisor.stop(finish);
+  /*
+    A wedged child must not make systemd wait indefinitely. This timer is deliberately unref'd
+    so it never keeps an otherwise-finished process alive; it is only a bound on graceful exit.
+  */
+  const forceExitTimer = setTimeout(finish, 5000);
+  forceExitTimer.unref?.();
+}
+
+process.once('SIGINT', () => stopForSignal('SIGINT'));
+process.once('SIGTERM', () => stopForSignal('SIGTERM'));
+
+module.exports = { startMediaMtx };