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packages/lib-service-health-checkserver/.gitignore

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+dist

packages/lib-service-health-checkserver/package.json

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+{
+  "name": "@hereconnect/lib-service-health-checkserver",
+  "version": "1.0.0",
+  "main": "src/health-server.ts",
+  "exports": {
+    ".": {
+      "import": "./src/health-server.ts",
+      "default": "./src/health-server.ts"
+    }
+  },
+  "files": ["src/**/*"],
+  "private": true,
+  "scripts": {
+    "lint": "tsc --noEmit src/health-server.ts",
+    "build": "pnpm run lint"
+  },
+  "devDependencies": {
+    "@types/node": "^20.17.6",
+    "typescript": "~5.6.3"
+  }
+}

packages/lib-service-health-checkserver/src/health-server.ts

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+import http from "http";
+
+/**
+ * Запускает HTTP-сервер для проверки здоровья.
+ * @param controller - AbortController для управления состоянием здоровья.
+ * @param defaultPort - Порт для сервера по умолчанию (если не указан в ENV HEALTH_PORT).
+ * @param defaultHostName - Имя хоста для сервера по умолчанию (если не указан в ENV HEALTH_HOST).
+ */
+export function startHealthServer(
+  controller: AbortController,
+  defaultPort: number = 8000,
+  defaultHostName: string = "127.0.0.1",
+) {
+  const port = parseInt(process.env.HEALTH_PORT || `${defaultPort}`, 10);
+  const hostname = process.env.HEALTH_HOST || defaultHostName;
+
+  const server = http.createServer((req, res) => {
+    if (req.url === "/health") {
+      const signal = controller.signal;
+
+      // Если сигнал отмены активирован, сервер помечается как "unhealthy"
+      if (signal.aborted) {
+        res.writeHead(500, { "Content-Type": "application/json" });
+        res.end(
+          JSON.stringify({
+            status: "unhealthy",
+            reason: "Service aborted",
+          }),
+        );
+        return;
+      }
+
+      // Возвращаем стандартный статус "ok", если всё нормально
+      res.writeHead(200, { "Content-Type": "application/json" });
+      res.end(
+        JSON.stringify({
+          status: "ok",
+        }),
+      );
+    } else {
+      res.writeHead(404, { "Content-Type": "text/plain" });
+      res.end("Not Found");
+    }
+  });
+
+  const { promise, resolve, reject } = Promise.withResolvers<void>();
+  server.once("error", reject);
+  server.listen(port, hostname, resolve);
+
+  promise.then(() => {
+    console.log(
+      `Healthcheck server running on http://${hostname}:${port}/health`,
+    );
+  });
+
+  // Закрываем сервер при активации AbortController
+  controller.signal.addEventListener("abort", () => {
+    console.log("Healthcheck server shutting down due to abort signal.");
+    reject();
+    server.close();
+  });
+
+  return promise;
+}

packages/lib-service-health-checkserver/tsconfig.json

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+{
+  "compilerOptions": {
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "outDir": "./dist",
+    "strict": true,
+    "types": ["node"]
+  },
+  "include": ["index.ts"]
+}