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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| # Remote webserver for CPH | ||
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| Currently implements a heartbeat server for live user count. | ||
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| ## Installation on a VM | ||
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| - Install node | ||
| - Copy `server.js` to `/opt/` | ||
| - Install the service: | ||
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| ``` | ||
| sudo cp server.service /etc/systemd/system | ||
| sudo systemctl daemon-reload | ||
| sudo systemctl start server.service | ||
| sudo systemctl enable server.service | ||
| ``` | ||
| - Check status using `sudo systemctl status server.service` | ||
| - In CPH, configure the address + port of the server. | ||
| ## Uninstall | ||
| ``` | ||
| sudo systemctl stop server.service | ||
| sudo systemctl disable server.service | ||
| sudo rm /etc/systemd/system/server.service | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| const http = require('http'); | ||
| const { env } = require('process'); | ||
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| class HeartbeatServer { | ||
| constructor() { | ||
| console.log("Creating new HeartbeatServer instance"); | ||
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| this.ips = new Map(); | ||
| this.refresh_interval_seconds = parseInt(env.REFRESH_INTERVAL) || 30; | ||
| this.port = parseInt(env.PORT) || 8080; | ||
| console.log(`Refresh interval: ${this.refresh_interval_seconds} seconds`); | ||
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| this.runServer(this.port); | ||
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| setInterval(() => { | ||
| this.runCleanup(); | ||
| }, this.refresh_interval_seconds * 1000); | ||
| } | ||
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| runServer(port) { | ||
| console.log("Starting heartbeat server on port " + port); | ||
| this.serverInstance = http.createServer((req, res) => { | ||
| this.processHeartbeat(req.socket.remoteAddress); | ||
| res.writeHead(200, { 'Content-Type': 'text/plain' }); | ||
| res.setHeader('Access-Control-Allow-Origin', '*'); | ||
| res.end(this.ips.size.toString()); | ||
| }); | ||
| this.serverInstance.listen(port); | ||
| console.log("Heartbeat server started."); | ||
| } | ||
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| runCleanup() { | ||
| const oldLen = this.ips.size; | ||
| const now = Date.now(); | ||
| for (const [ip, timestamp] of this.ips.entries()) { | ||
| if (now - timestamp > this.refresh_interval_seconds * 1000) { | ||
| this.ips.delete(ip); | ||
| console.log("Deleted stale IP: " + ip); | ||
| } | ||
| } | ||
| const newLen = this.ips.size; | ||
| console.log(`Cleaned up ${oldLen - newLen} stale IPs. New count: ${newLen}`); | ||
| } | ||
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| // Called when a heartbeat is received from an IP | ||
| processHeartbeat(ip) { | ||
| this.ips.set(ip, Date.now()); | ||
| } | ||
| } | ||
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| console.log("Starting app"); | ||
| new HeartbeatServer(); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| [Unit] | ||
| Description=Node.js heartbeat server | ||
| After=network.target | ||
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| [Service] | ||
| ExecStart=/usr/bin/env node /opt/server.js | ||
| Restart=always | ||
| RestartSec=5 | ||
| Environment=PORT=4546 | ||
| User=server | ||
| Group=server | ||
| WorkingDirectory=/opt | ||
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| [Install] | ||
| WantedBy=multi-user.target |
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