Merge remote-tracking branch 'ui/master'

lib/ui/cluster.js

@@ -0,0 +1,110 @@
+"use strict";
+
+const cluster = require("cluster");
+const config = require("./config");
+const logger = require("./logger");
+
+const VERSION = require("../../package.json")["version"];
+
+let respawnTimestamp = 0;
+let tooManyCrashesTimestamp = 0;
+
+function restartWorker(worker, code, signal) {
+  const msg = {
+    message: "Worker died",
+    pid: worker.process.pid
+  };
+
+  if (code != null) msg.exitCode = code;
+
+  if (signal != null) msg.signal = signal;
+
+  logger.error(msg);
+
+  const now = Date.now();
+  respawnTimestamp = Math.max(now, respawnTimestamp + 2000);
+  if (respawnTimestamp === now) {
+    tooManyCrashesTimestamp = now;
+    cluster.fork();
+    return;
+  }
+
+  if (now - tooManyCrashesTimestamp > 60000) {
+    process.exitCode = 1;
+    cluster.removeListener("exit", restartWorker);
+    for (const pid in cluster.workers) cluster.workers[pid].kill();
+
+    logger.error({
+      message: "Too many crashes, exiting",
+      pid: process.pid
+    });
+    return;
+  }
+
+  setTimeout(() => {
+    if (process.exitCode) return;
+    cluster.fork();
+  }, respawnTimestamp - now);
+}
+
+function start() {
+  logger.init(VERSION);
+
+  logger.info({
+    message: "GenieACS UI starting",
+    pid: process.pid,
+    version: VERSION
+  });
+
+  cluster.on("listening", (worker, address) => {
+    logger.info({
+      message: "Worker listening",
+      pid: worker.process.pid,
+      address: address.address,
+      port: address.port
+    });
+  });
+
+  cluster.on("exit", restartWorker);
+
+  process.on("SIGINT", () => {
+    logger.info({
+      message: "Received signal SIGINT, exiting",
+      pid: process.pid
+    });
+
+    cluster.removeListener("exit", restartWorker);
+  });
+
+  process.on("SIGTERM", () => {
+    logger.info({
+      message: "Received signal SIGTERM, exiting",
+      pid: process.pid
+    });
+
+    cluster.removeListener("exit", restartWorker);
+    for (const pid in cluster.workers) cluster.workers[pid].kill();
+  });
+
+  cluster.setupMaster({ exec: "./server" });
+
+  let workerCount = config.server.workers;
+
+  if (!workerCount) workerCount = Math.max(2, require("os").cpus().length);
+
+  for (let i = 0; i < workerCount; ++i) cluster.fork();
+}
+
+process.on("uncaughtException", err => {
+  logger.error({
+    message: "Uncaught exception in master process, exiting",
+    exception: err,
+    pid: process.pid
+  });
+  process.exitCode = 1;
+  cluster.removeListener("exit", restartWorker);
+  for (const pid in cluster.workers) cluster.workers[pid].kill();
+});
+
+// Starting GenieACS UI
+start();