From 5ac439a96cb376c5dde278f974c6c6c4667854a6 Mon Sep 17 00:00:00 2001
From: n08i40k <nhomcencko1@gmail.com>
Date: Fri, 10 Apr 2026 17:48:16 +0000
Subject: [PATCH] feat: initial commit

---
 .env.example       |  1 +
 Dockerfile         | 13 +++++++++++++
 docker-compose.yml | 12 ++++++++++++
 probe-server.js    | 26 ++++++++++++++++++++++++++
 4 files changed, 52 insertions(+)
 create mode 100644 .env.example
 create mode 100644 Dockerfile
 create mode 100644 docker-compose.yml
 create mode 100644 probe-server.js

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..56e2bcb
--- /dev/null
+++ b/.env.example
@@ -0,0 +1 @@
+PROBE_PORT=3567
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..41d1af4
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,13 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY probe-server.js /app/probe-server.js
+
+ENV PORT=19090
+ENV HOST=0.0.0.0
+
+EXPOSE 19090
+
+CMD ["node", "probe-server.js"]
+
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..abd4e95
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,12 @@
+services:
+  probe-server:
+    build:
+      context: .
+    container_name: yc-probe-server
+    restart: always
+    environment:
+      PORT: ${PROBE_PORT:-19090}
+      HOST: 0.0.0.0
+    ports:
+      - "${PROBE_PORT:-19090}:${PROBE_PORT:-19090}"
+
diff --git a/probe-server.js b/probe-server.js
new file mode 100644
index 0000000..a8746f3
--- /dev/null
+++ b/probe-server.js
@@ -0,0 +1,26 @@
+'use strict';
+
+const net = require('node:net');
+
+const PORT = Number(process.env.PORT || 19090);
+const HOST = process.env.HOST || '0.0.0.0';
+
+if (Number.isNaN(PORT)) {
+  throw new Error('PORT must be a number');
+}
+
+const server = net.createServer((socket) => {
+  socket.setKeepAlive(true, 15000);
+
+  socket.on('data', (buf) => {
+    const msg = buf.toString('utf8').trim();
+    if (msg === 'ping') {
+      socket.write('pong\n');
+    }
+  });
+});
+
+server.listen(PORT, HOST, () => {
+  console.log(`[probe] listening on ${HOST}:${PORT}`);
+});
+