yeah

.gitignore

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+node_modules
+dist

README.md

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+yeah

package.json

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+{
+  "name": "monitor",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "build": "rm -rf dist && tsc",
+    "start": "node dist/index.js",
+    "dev": "tsc-watch --onSuccess \"node dist\""
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/express": "^4.17.17",
+    "@types/node": "^20.4.5",
+    "tsc-watch": "^6.0.4",
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+    "express": "^4.18.2",
+    "onoff": "^6.0.3",
+    "socket.io-client": "^4.7.1"
+  }
+}

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src/index.ts

@@ -0,0 +1,116 @@
+import { Gpio } from "onoff";
+import { exec } from "child_process";
+import { config } from "dotenv";
+import { io } from "socket.io-client";
+
+config();
+
+const KUMA_URL = process.env.WS_ENDPOINT || "wss://uptime.lea.pet";
+const API_USER = process.env.API_USER!;
+const API_PASS = process.env.API_PASS!;
+const NO_GREEN = !!process.env.NO_GREEN;
+const FUNNY = !process.env.NO_FUNNY; // why would you not want fart noises
+
+if (!API_USER) throw new Error("Missing $API_USER");
+if (!API_PASS) throw new Error("Missing $API_PASS");
+
+const ledRed = new Gpio(Number(process.env.GPIO_RED || 14), "out");
+const ledGreen = new Gpio(Number(process.env.GPIO_GREEN || 15), "out");
+
+const monitors: { [key: string]: { status: boolean, index: number } } = {};
+const paused: { [key: string]: boolean } = {};
+
+const socket = io(`${KUMA_URL}`);
+
+socket.on("monitorList", (items) => {
+    console.log("got monitor list");
+
+    for (const item of Object.values(items) as any[]) {
+        paused[item.id] = item.active == 0 || item.type == "group";
+    }
+
+    think();
+});
+
+socket.on("importantHeartbeatList", (id, items) => {
+    console.log("got heart beat list");
+
+    for (const data of items) {
+        const entry = monitors[id];
+        const index = new Date(data.time).getTime();
+        if (entry && entry.index >= index) continue;
+
+        monitors[id] = {
+            // status is 0 if down, 1 if up, 2 if paused. we only want to alert if it's 0
+            status: !!data.status,
+            index: index,
+        }
+    }
+
+    think();
+});
+
+
+socket.on("heartbeat", (data) => {
+    console.log("got heartbeat");
+
+    const entry = monitors[''+data.monitorID];
+    const index = new Date(data.time).getTime();
+    if (entry && entry.index >= index) return;
+
+    monitors[''+data.monitorID] = {
+        // status is 0 if down, 1 if up, 2 if paused. we only want to alert if it's 0
+        status: !!data.status,
+        index: index,
+    }
+
+    think();
+});
+
+socket.on("connect", () => {
+    console.log("Logging in");
+    socket.emit("login", { username: API_USER, password: API_PASS, token: "" }, (res: any) => setStatus("green", false));
+});
+
+const sleep = (t: number) => new Promise(r => setTimeout(r, t));
+
+type Status = "red" | "green" | "working";
+let currentStatus: Status = "working";
+function setStatus(status: Status, sound = true) {
+    console.log("Status", status);
+    currentStatus = status;
+    switch(status) {
+        case "green": {
+            ledRed.writeSync(0);
+            ledGreen.writeSync(NO_GREEN ? 0 : 1);
+
+            if (sound && FUNNY) exec("aplay assets/yay.wav");
+            break;
+        }
+        case "red": {
+            ledRed.writeSync(1);
+            ledGreen.writeSync(0);
+
+            if (sound && FUNNY) exec("aplay assets/fart.wav");
+            break;
+        }
+        case "working": {
+            ledRed.writeSync(1);
+            ledGreen.writeSync(1);
+            break;
+        }
+    }
+}
+
+function think() {
+    const down = Object.entries(monitors)
+        .filter(m => !m[1].status && !paused[m[0]]);
+
+    if (down.length) {
+        if (currentStatus != "red") setStatus("red");
+    } else {
+        if (currentStatus != "green") setStatus("green");
+    }
+}
+
+setStatus("working");

tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "es2017",
+    "module": "ES2022",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "rootDir": "src",
+    "outDir": "dist",
+    "moduleResolution": "NodeNext"
+  }
+}