longhorn support

* longhorn widget for showing storage stats as "disks"

src/components/widgets/longhorn/longhorn.jsx

@@ -0,0 +1,57 @@
+import useSWR from "swr";
+import { BiError } from "react-icons/bi";
+import { i18n, useTranslation } from "next-i18next";
+
+import Node from "./node";
+
+export default function Longhorn({ options }) {
+  const { expanded, total, labels, include, nodes } = options;
+  const { t } = useTranslation();
+  const { data, error } = useSWR(`/api/widgets/longhorn`, {
+    refreshInterval: 1500
+  });
+
+  if (error || data?.error) {
+    return (
+      <div className="flex flex-col max-w:full sm:basis-auto self-center grow-0 flex-wrap">
+        <BiError className="text-theme-800 dark:text-theme-200 w-5 h-5" />
+        <div className="flex flex-col ml-3 text-left">
+          <span className="text-theme-800 dark:text-theme-200 text-xs">{t("widget.api_error")}</span>
+        </div>
+      </div>
+    );
+  }
+
+  if (!data) {
+    return (
+      <div className="flex flex-col max-w:full sm:basis-auto self-center grow-0 flex-wrap">
+        <div className="flex flex-row self-center flex-wrap justify-between" />
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex flex-col max-w:full sm:basis-auto self-center grow-0 flex-wrap">
+      <div className="flex flex-row self-center flex-wrap justify-between">
+        {data.nodes
+          .filter((node) => {
+            if (node.id === 'total' && total) {
+              return true;
+            }
+            if (!nodes) {
+              return false;
+            }
+            if (include && !include.includes(node.id)) {
+              return false;
+            }
+            return true;
+          })
+          .map((node) =>
+            <div key={node.id}>
+              <Node data={{ node }} expanded={expanded} labels={labels} />
+            </div>
+          )}
+      </div>
+    </div>
+  );
+}

src/components/widgets/longhorn/node.jsx

@@ -0,0 +1,32 @@
+import { FiHardDrive } from "react-icons/fi";
+import { useTranslation } from "next-i18next";
+
+import UsageBar from "../resources/usage-bar";
+
+export default function Node({ data, expanded, labels }) {
+  const { t } = useTranslation();
+
+  return (
+    <>
+      <div className="flex-none flex flex-row items-center mr-3 py-1.5">
+        <FiHardDrive className="text-theme-800 dark:text-theme-200 w-5 h-5" />
+        <div className="flex flex-col ml-3 text-left min-w-[85px]">
+        <span className="text-theme-800 dark:text-theme-200 text-xs flex flex-row justify-between">
+          <div className="pl-0.5">{t("common.bytes", { value: data.node.available })}</div>
+          <div className="pr-1">{t("resources.free")}</div>
+        </span>
+          {expanded && (
+            <span className="text-theme-800 dark:text-theme-200 text-xs flex flex-row justify-between">
+            <div className="pl-0.5">{t("common.bytes", { value: data.node.maximum })}</div>
+            <div className="pr-1">{t("resources.total")}</div>
+          </span>
+          )}
+          <UsageBar percent={Math.round((data.node.available / data.node.maximum) * 100)} />
+        </div>
+      </div>
+      {labels && (
+        <div className="ml-6 pt-1 text-center text-theme-800 dark:text-theme-200 text-xs">{data.node.id}</div>
+      )}
+    </>
+  );
+}

src/components/widgets/widget.jsx

@@ -13,6 +13,7 @@ const widgetMappings = {
   unifi_console: dynamic(() => import("components/widgets/unifi_console/unifi_console")),
   glances: dynamic(() => import("components/widgets/glances/glances")),
   openmeteo: dynamic(() => import("components/widgets/openmeteo/openmeteo")),
+  longhorn: dynamic(() => import("components/widgets/longhorn/longhorn")),
 };
 
 export default function Widget({ widget }) {

src/pages/api/widgets/kubernetes.js

@@ -39,19 +39,7 @@ export default async function handler(req, res) {
       }
     });
   }
-  // Maybe Storage CSI can provide this information
-  // if (type === "disk") {
-  //   if (!existsSync(target)) {
-  //     return res.status(404).json({
-  //       error: "Target not found",
-  //     });
-  //   }
-  //
-  //   return res.status(200).json({
-  //     drive: await drive.info(target || "/"),
-  //   });
-  // }
-  //
+
   if (type === "memory") {
     const SCALE_MB = 1024 * 1024;
     const usedMemMb = memUsage / SCALE_MB;

src/pages/api/widgets/longhorn.js

@@ -0,0 +1,82 @@
+import { httpProxy } from "../../../utils/proxy/http";
+import createLogger from "../../../utils/logger";
+import { getSettings } from "../../../utils/config/config";
+
+const logger = createLogger("longhorn");
+
+function parseLonghornData(data) {
+  const json = JSON.parse(data);
+
+  if (!json) {
+    return null;
+  }
+
+  const nodes = json.data.map((node) => {
+    let available = 0;
+    let maximum = 0;
+    let reserved = 0;
+    let scheduled = 0;
+    Object.keys(node.disks).forEach((diskKey) => {
+      const disk = node.disks[diskKey];
+      available += disk.storageAvailable;
+      maximum += disk.storageMaximum;
+      reserved += disk.storageReserved;
+      scheduled += disk.storageScheduled;
+    });
+    return {
+      id: node.id,
+      available,
+      maximum,
+      reserved,
+      scheduled,
+    };
+  });
+  const total = nodes.reduce((summary, node) => ({
+    available: summary.available + node.available,
+    maximum: summary.maximum + node.maximum,
+    reserved: summary.reserved + node.reserved,
+    scheduled: summary.scheduled + node.scheduled,
+  }));
+  total.id = "total";
+  nodes.push(total);
+  return nodes;
+}
+
+export default async function handler(req, res) {
+  const settings = getSettings();
+  const longhornSettings = settings?.providers?.longhorn;
+  const {url, username, password} = longhornSettings;
+
+  if (!url) {
+    const errorMessage = "Missing Longhorn URL";
+    logger.error(errorMessage);
+    return res.status(400).json({ error: errorMessage });
+  }
+
+  const apiUrl = `${url}/v1/nodes`;
+  const headers = {
+    "Accept-Encoding": "application/json"
+  };
+  if (username && password) {
+    headers.Authorization = `Basic ${Buffer.from(`${username}:${password}`).toString("base64")}`
+  }
+  const params = { method: "GET", headers };
+
+  const [status, contentType, data] = await httpProxy(apiUrl, params);
+
+  if (status === 401) {
+    logger.error("Authorization failure getting data from Longhorn API. Data: %s", data);
+  }
+
+  if (status !== 200) {
+    logger.error("HTTP %d getting data from Longhorn API. Data: %s", status, data);
+  }
+
+  if (contentType) res.setHeader("Content-Type", contentType);
+
+  const nodes = parseLonghornData(data);
+
+  return res.status(200).json({
+    nodes,
+  });
+}