Server Pulse source

<div class="alert alert-info" role="status">
  <strong>Server Pulse</strong> adds a resource monitor below each server's
  console. Open a server's Console page and choose Settings on the Server Pulse
  card. Preferences are held in browser memory for the current panel session.
  This example has no backend routes, database migrations or installation
  scripts.
</div>

Server:
  Terminal:
    AfterContent: "ServerPulse"

import { useState } from "react";
import { Dialog } from "@base-ui/react/dialog";
import { useQuery } from "@tanstack/react-query";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { z } from "zod";
import { create } from "zustand";
import { formatDistanceToNow } from "date-fns";
import { clamp } from "es-toolkit";
import { Activity, RefreshCw, Settings, X } from "lucide-react";
import { motion, useReducedMotion } from "motion/react";
import http, { httpErrorToHuman } from "@/api/http";
import { ServerContext } from "@/state/server";

const settingsSchema = z.object({
  label: z.string().trim().min(1, "Enter a label.").max(48),
  interval: z.enum(["20", "30", "60"]),
});
type SettingsValues = z.infer<typeof settingsSchema>;

// UI preferences only: never put tokens, server data or passwords in this store.
const usePreferences = create<{
  settings: SettingsValues;
  apply: (settings: SettingsValues) => void;
}>((set) => ({
  settings: { label: "Server Pulse", interval: "30" },
  apply: (settings) => set({ settings }),
}));

// Validate the wire response rather than assuming a TypeScript cast checks it.
const statsSchema = z.object({
  object: z.literal("stats"),
  attributes: z.object({
    current_state: z.string(),
    is_suspended: z.boolean(),
    resources: z.object({
      cpu_absolute: z.number(),
      memory_bytes: z.number(),
      disk_bytes: z.number(),
    }),
  }),
});

function Pulse({ uuid, memoryLimit }: { uuid: string; memoryLimit: number }) {
  const { settings, apply } = usePreferences();
  const [settingsOpen, setSettingsOpen] = useState(false);
  const reducedMotion = useReducedMotion();
  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<SettingsValues>({
    resolver: zodResolver(settingsSchema),
    defaultValues: settings,
  });

  // Reuse the panel's QueryClientProvider, with a key scoped to this server.
  const stats = useQuery({
    queryKey: ["serverpulse", "resources", uuid],
    queryFn: async ({ signal }) => {
      const { data } = await http.get<unknown>(
        `/api/client/servers/${encodeURIComponent(uuid)}/resources`,
        { signal },
      );
      return statsSchema.parse(data).attributes;
    },
    staleTime: 20_000,
    refetchInterval: Number(settings.interval) * 1000,
    refetchIntervalInBackground: false,
    refetchOnWindowFocus: false,
    retry: false,
  });

  const resources = stats.data?.resources;
  const memoryPercent =
    resources && memoryLimit > 0
      ? clamp(
          (resources.memory_bytes / (memoryLimit * 1024 * 1024)) * 100,
          0,
          100,
        )
      : null;

  return (
    <motion.section
      className="serverpulse"
      aria-label={settings.label}
      initial={reducedMotion ? false : { opacity: 0, y: 6 }}
      animate={{ opacity: 1, y: 0 }}
    >
      <header className="serverpulse-header">
        <h2>
          <Activity size={18} aria-hidden /> {settings.label}
        </h2>
        <div className="serverpulse-actions">
          <button
            type="button"
            onClick={() => void stats.refetch()}
            disabled={stats.isFetching}
            aria-label="Refresh resource usage"
          >
            <RefreshCw size={16} aria-hidden /> Refresh
          </button>
          <Dialog.Root open={settingsOpen} onOpenChange={setSettingsOpen}>
            <Dialog.Trigger className="serverpulse-button">
              <Settings size={16} aria-hidden /> Settings
            </Dialog.Trigger>
            <Dialog.Portal>
              <Dialog.Backdrop className="serverpulse-backdrop" />
              <Dialog.Popup className="serverpulse-dialog">
                <Dialog.Title>Server Pulse settings</Dialog.Title>
                <Dialog.Description>
                  Preferences apply to this panel session. Resource data is
                  cached for 20 seconds.
                </Dialog.Description>
                <form
                  onSubmit={handleSubmit((values) => {
                    apply(values);
                    setSettingsOpen(false);
                  })}
                >
                  <label htmlFor="serverpulse-label">Card label</label>
                  <input
                    id="serverpulse-label"
                    maxLength={48}
                    aria-invalid={!!errors.label}
                    aria-describedby={
                      errors.label ? "serverpulse-label-error" : undefined
                    }
                    {...register("label")}
                  />
                  {errors.label && (
                    <p id="serverpulse-label-error" role="alert">
                      {errors.label.message}
                    </p>
                  )}
                  <label htmlFor="serverpulse-interval">Refresh interval</label>
                  <select id="serverpulse-interval" {...register("interval")}>
                    <option value="20">20 seconds</option>
                    <option value="30">30 seconds</option>
                    <option value="60">60 seconds</option>
                  </select>
                  <div className="serverpulse-actions">
                    <button type="submit">Apply preferences</button>
                    <Dialog.Close
                      className="serverpulse-button"
                      aria-label="Close settings"
                    >
                      <X size={16} aria-hidden /> Close
                    </Dialog.Close>
                  </div>
                </form>
              </Dialog.Popup>
            </Dialog.Portal>
          </Dialog.Root>
        </div>
      </header>
      {stats.isPending && <p role="status">Loading resource usage…</p>}
      {stats.isError && <p role="alert">{httpErrorToHuman(stats.error)}</p>}
      {resources && stats.data && (
        <>
          <dl className="serverpulse-stats">
            <div>
              <dt>CPU</dt>
              <dd>{resources.cpu_absolute.toFixed(1)}%</dd>
            </div>
            <div>
              <dt>Memory</dt>
              <dd>{(resources.memory_bytes / 1024 / 1024).toFixed(0)} MiB</dd>
            </div>
            <div>
              <dt>Disk</dt>
              <dd>{(resources.disk_bytes / 1024 / 1024).toFixed(0)} MiB</dd>
            </div>
          </dl>
          {memoryPercent !== null && (
            <div
              className="serverpulse-meter"
              role="progressbar"
              aria-label="Memory limit used"
              aria-valuenow={Math.round(memoryPercent)}
              aria-valuemin={0}
              aria-valuemax={100}
            >
              <span style={{ width: `${memoryPercent}%` }} />
            </div>
          )}
          <p className="serverpulse-caption">
            {stats.isError
              ? "Last successful reading"
              : stats.data.current_state}
            {stats.data.is_suspended ? " · Suspended" : ""}
            {" · "}Updated{" "}
            {formatDistanceToNow(stats.dataUpdatedAt, { addSuffix: true })}
          </p>
        </>
      )}
    </motion.section>
  );
}

export default function ServerPulse() {
  const server = ServerContext.useStoreState((state) => state.server.data);
  // Only mount the query after the panel has loaded and authorized this server.
  return server ? (
    <Pulse
      key={server.uuid}
      uuid={server.uuid}
      memoryLimit={server.limits.memory}
    />
  ) : null;
}

info:
  name: "Server Pulse"
  identifier: "serverpulse"
  description: "A resource monitor demonstrating Aquadactyl's shared addon libraries."
  version: "1.0.0"
  target: "beta-2026-08"
  author: "Aquadactyl documentation"
  website: "https://aquadactyl.uk/docs/blueprint/example-extension"

admin:
  view: "admin.blade.php"

dashboard:
  components: "components"
  css: "dashboard.css"

.serverpulse {
  margin-top: 1rem;
  padding: 1.25rem;
  border: 1px solid #37434d;
  border-radius: 0.5rem;
  background: #1b232b;
  color: #e9edf0;
}
.serverpulse-header,
.serverpulse-actions,
.serverpulse h2,
.serverpulse-button,
.serverpulse button,
.serverpulse-dialog button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.serverpulse-header {
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}
.serverpulse h2,
.serverpulse-dialog h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}
.serverpulse-actions {
  flex-wrap: wrap;
}
.serverpulse-button,
.serverpulse button,
.serverpulse-dialog button {
  min-height: 2.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid #536470;
  border-radius: 0.375rem;
  background: #26313b;
  color: #e9edf0;
  cursor: pointer;
}
.serverpulse button:disabled {
  opacity: 0.5;
  cursor: wait;
}
.serverpulse button:focus-visible,
.serverpulse-dialog :focus-visible {
  outline: 2px solid #78d4cc;
  outline-offset: 3px;
}
.serverpulse-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}
.serverpulse-stats dt,
.serverpulse-caption {
  font-size: 0.8rem;
  color: #b7c3cc;
}
.serverpulse-stats dd {
  margin: 0.25rem 0 0;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}
.serverpulse-meter {
  height: 0.375rem;
  border-radius: 1rem;
  overflow: hidden;
  background: #37434d;
}
.serverpulse-meter span {
  display: block;
  height: 100%;
  background: #78d4cc;
}
.serverpulse-caption {
  margin-top: 0.75rem;
}
.serverpulse-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgb(0 0 0 / 65%);
}
.serverpulse-dialog {
  position: fixed;
  z-index: 1001;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(28rem, calc(100vw - 2rem));
  max-height: calc(100dvh - 2rem);
  overflow-y: auto;
  border: 1px solid #536470;
  border-radius: 0.5rem;
  padding: 1.5rem;
  background: #1b232b;
  color: #e9edf0;
}
.serverpulse-dialog p {
  margin: 0.75rem 0;
}
.serverpulse-dialog label {
  display: block;
  margin: 1rem 0 0.375rem;
}
.serverpulse-dialog input,
.serverpulse-dialog select {
  width: 100%;
  padding: 0.625rem;
  border: 1px solid #536470;
  border-radius: 0.375rem;
  background: #11161b;
  color: #e9edf0;
}
.serverpulse-dialog .serverpulse-actions {
  margin-top: 1.5rem;
}
@media (max-width: 480px) {
  .serverpulse-stats {
    grid-template-columns: 1fr;
  }
}