Feature: Add APC UPS widget (#4840)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/widgets/services/apcups.md

@@ -0,0 +1,16 @@
+---
+title: APC UPS Monitoring
+description: Lightweight monitoring widget for APC UPSs using apcupsd daemon
+---
+
+This widget extracts UPS information from an apcupsd daemon.
+Only works for [APC/Schneider](https://www.se.com/us/en/product-range/61915-smartups/#products) UPS products.
+
+[!NOTE]
+By default apcupsd daemon is bound to 127.0.0.1. Edit `/etc/apcupsd.conf` and change `NISIP` to an IP accessible from your homepage docker (usually your internal LAN interface).
+
+```yaml
+widget:
+  type: apcups
+  url: tcp://your.acpupsd.host:3551
+```

docs/widgets/services/index.md

@@ -8,6 +8,7 @@ search:
 You can also find a list of all available service widgets in the sidebar navigation.
 
 - [Adguard Home](adguard-home.md)
+- [APC UPS](apcups.md)
 - [ArgoCD](argocd.md)
 - [Atsumeru](atsumeru.md)
 - [Audiobookshelf](audiobookshelf.md)

mkdocs.yml

@@ -31,6 +31,7 @@ nav:
       - "Service Widgets":
           - widgets/services/index.md
           - widgets/services/adguard-home.md
+          - widgets/services/apcups.md
           - widgets/services/argocd.md
           - widgets/services/atsumeru.md
           - widgets/services/audiobookshelf.md

public/locales/en/common.json

@@ -1016,5 +1016,11 @@
         "issues": "Issues",
         "merges": "Merge Requests",
         "projects": "Projects"
+    },
+    "apcups": {
+        "status": "Status",
+        "load": "Load",
+        "bcharge":"Battery Charge",
+        "timeleft":"Time Left"
     }
 }

src/widgets/apcups/component.jsx

@@ -0,0 +1,33 @@
+import Container from "components/services/widget/container";
+import Block from "components/services/widget/block";
+
+import useWidgetAPI from "utils/proxy/use-widget-api";
+
+export default function Component({ service }) {
+  const { widget } = service;
+  const { data, error } = useWidgetAPI(widget);
+
+  if (error) {
+    return <Container service={service} error={error} />;
+  }
+
+  if (!data) {
+    return (
+      <Container service={service}>
+        <Block label="apcups.status" />
+        <Block label="apcups.load" />
+        <Block label="apcups.bcharge" />
+        <Block label="apcups.timeleft" />
+      </Container>
+    );
+  }
+
+  return (
+    <Container service={service}>
+      <Block label="apcups.status" value={data.status} />
+      <Block label="apcups.load" value={data.load} />
+      <Block label="apcups.bcharge" value={data.bcharge} />
+      <Block label="apcups.timeleft" value={data.timeleft} />
+    </Container>
+  );
+}

src/widgets/apcups/proxy.js

@@ -0,0 +1,112 @@
+import net from "node:net";
+import { Buffer } from "node:buffer";
+
+import getServiceWidget from "utils/config/service-helpers";
+import createLogger from "utils/logger";
+
+const logger = createLogger("apcupsProxyHandler");
+
+function parseResponse(buffer) {
+  let ptr = 0;
+  const output = [];
+  while (ptr < buffer.length) {
+    const lineLen = buffer.readUInt16BE(ptr);
+    const asciiData = buffer.toString("ascii", ptr + 2, lineLen + ptr + 2);
+    output.push(asciiData);
+    ptr += 2 + lineLen;
+  }
+
+  return output;
+}
+
+function statusAsJSON(statusOutput) {
+  return statusOutput?.reduce((output, line) => {
+    if (!line || line.startsWith("END APC")) return output;
+    const [key, value] = line.trim().split(":");
+    const newOutput = { ...output };
+    newOutput[key.trim()] = value?.trim();
+    return newOutput;
+  }, {});
+}
+
+async function getStatus(host = "127.0.0.1", port = 3551) {
+  return new Promise((resolve, reject) => {
+    const socket = new net.Socket();
+    socket.setTimeout(5000);
+    socket.connect({ host, port });
+
+    const response = [];
+
+    socket.on("connect", () => {
+      const CMD = "status";
+      logger.debug(`Connecting to ${host}:${port}`);
+      const buffer = Buffer.alloc(CMD.length + 2);
+      buffer.writeUInt16BE(CMD.length, 0);
+      buffer.write(CMD, 2);
+      socket.write(buffer);
+    });
+
+    socket.on("data", (data) => {
+      response.push(data);
+
+      if (data.readUInt16BE(data.length - 2) === 0) {
+        try {
+          const buffer = Buffer.concat(response);
+          const output = parseResponse(buffer);
+          resolve(output);
+        } catch (e) {
+          reject(e);
+        }
+        socket.end();
+      }
+    });
+
+    socket.on("error", (err) => {
+      socket.destroy();
+      reject(err);
+    });
+    socket.on("timeout", () => {
+      socket.destroy();
+      reject(new Error("socket timeout"));
+    });
+    socket.on("end", () => {
+      logger.debug("socket end");
+    });
+    socket.on("close", () => {
+      logger.debug("socket closed");
+    });
+  });
+}
+
+export default async function apcupsProxyHandler(req, res) {
+  const { group, service, index } = req.query;
+
+  if (!group || !service) {
+    logger.debug("Invalid or missing service '%s' or group '%s'", service, group);
+    return res.status(400).json({ error: "Invalid proxy service type" });
+  }
+
+  const widget = await getServiceWidget(group, service, index);
+  if (!widget) {
+    logger.debug("Invalid or missing widget for service '%s' in group '%s'", service, group);
+    return res.status(400).json({ error: "Invalid proxy service type" });
+  }
+
+  const url = new URL(widget.url);
+  const data = {};
+
+  try {
+    const statusData = await getStatus(url.hostname, url.port);
+    const jsonData = statusAsJSON(statusData);
+
+    data.status = jsonData.STATUS;
+    data.load = jsonData.LOADPCT;
+    data.bcharge = jsonData.BCHARGE;
+    data.timeleft = jsonData.TIMELEFT;
+  } catch (e) {
+    logger.error(e);
+    return res.status(500).json({ error: e.message });
+  }
+
+  return res.status(200).send(data);
+}

src/widgets/apcups/widget.js

@@ -0,0 +1,7 @@
+import apcupsProxyHandler from "./proxy";
+
+const widget = {
+  proxyHandler: apcupsProxyHandler,
+};
+
+export default widget;

src/widgets/components.js

@@ -2,6 +2,7 @@ import dynamic from "next/dynamic";
 
 const components = {
   adguard: dynamic(() => import("./adguard/component")),
+  apcups: dynamic(() => import("./apcups/component")),
   argocd: dynamic(() => import("./argocd/component")),
   atsumeru: dynamic(() => import("./atsumeru/component")),
   audiobookshelf: dynamic(() => import("./audiobookshelf/component")),

src/widgets/widgets.js

@@ -1,4 +1,5 @@
 import adguard from "./adguard/widget";
+import apcups from "./apcups/widget";
 import argocd from "./argocd/widget";
 import atsumeru from "./atsumeru/widget";
 import audiobookshelf from "./audiobookshelf/widget";
@@ -134,6 +135,7 @@ import zabbix from "./zabbix/widget";
 
 const widgets = {
   adguard,
+  apcups,
   argocd,
   atsumeru,
   audiobookshelf,