184 lines
13 KiB
Plaintext
184 lines
13 KiB
Plaintext
page wrnexuspubsub {
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seo {
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title = "@wrnexus/pubsub"
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description = "In-process and Redis-backed publish/subscribe."
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}
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view {
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<div class="docs-shell">
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<SkipLink label="Skip to content" href="#main" class="docs-skip-link" />
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<header class="topbar">
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<a class="brand" href="/"><span>W</span> WRNexusJS</a>
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<nav aria-label="Primary"><a href="/getting-started">Get started</a><a href="/packages">Packages</a><a href="https://component.wrnexusjs.dev/">Components</a><a href="/language">Language</a><a href="/architecture">Architecture</a></nav>
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<div class="topbar-actions"><a class="preview-pill" href="/access">Private preview · v0.5.10</a><button data-wire-theme-toggle class="theme-button" aria-label="Toggle color theme" title="Toggle color theme">◐</button></div>
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<div class="mobile-doc-nav"><details><summary>Browse documentation</summary><nav><a href="/getting-started">Get started</a><a href="/packages">Packages</a><a href="https://component.wrnexusjs.dev/">Components</a><a href="/language">Language</a><a href="/architecture">Architecture</a><a href="/tutorial">Tutorial</a><a href="/guides/project-structure">Guides</a><a href="/examples">Examples</a><a href="/search">Search</a></nav></details></div>
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<main class="portal-main docs-layout">
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<article id="main" class="documentation prose standalone package-document"><nav class="breadcrumbs" aria-label="Breadcrumb"><a href="/">Home</a><span>/</span><a href="/packages">Packages</a><span>/</span><span aria-current="page">@wrnexus/pubsub</span></nav><section class="doc-intro"><span class="eyebrow">Realtime · Package reference</span><h1>@wrnexus/pubsub</h1><p>In-process and Redis-backed publish/subscribe.</p><div class="doc-meta"><span>v0.5.10</span><span>Private registry</span><span>Realtime</span></div><section id="access" class="access-callout"><h2>Install the package</h2><p>After WorkRoot approves private registry access, install the release-aligned package:</p><pre><code>bun add @wrnexus/pubsub@0.5.10</code><button type="button" class="copy-button" aria-label="Copy installation command">Copy</button></pre><p><a href="/access">Request preview access</a>. Never put registry tokens in source control.</p></section></section><section id="guide"><blockquote>Topic-based publish/subscribe with a pluggable driver — in-process by default, Redis for cross-process messaging.</blockquote>
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<p>Part of the <strong>WRNexusJS</strong> framework — an SSR-first, Bun-native full-stack web framework.</p>
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<h3 id="overview">Overview</h3>
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<p><code>@wrnexus/pubsub</code> is a small server-side pub/sub bus. You publish messages to a topic and subscribe with topic patterns; handlers fire for matching topics. The default driver keeps everything in-process, and you can swap in the Redis driver (<code>@wrnexus/pubsub/redis</code>) to fan messages out across processes or hosts. It also backs <code>@wrnexus/core</code>'s realtime bridge for horizontal scaling.</p>
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<pre data-language="bash"><code>bun add @wrnexus/pubsub</code></pre>
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<blockquote>Private package — the machine must be authenticated to the <code>wrnexus</code> npm org</blockquote>
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<blockquote>(a read token in <code>~/.npmrc</code>). Requires <strong>Bun</strong> (Node is not supported).</blockquote>
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<h3 id="api">API</h3>
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<h4 id="createpubsub-driver-pubsub"><code>createPubSub(driver?): PubSub</code></h4>
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<p>Creates a bus over a driver. Defaults to <code>memoryDriver()</code> (in-process).</p>
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<pre data-language="ts"><code>interface PubSub {
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publish<T = unknown>(topic: string, message: T): Promise<void>;
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subscribe<T = unknown>(pattern: string, handler: Handler<T>): () => void;
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}
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type Handler<T = unknown> = (message: T, topic: string) => void | Promise<void>;</code></pre>
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<ul>
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<li><code>publish(topic, message)</code> — resolves once the driver has dispatched the message.</li>
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<li><code>subscribe(pattern, handler)</code> — returns an unsubscribe function.</li>
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</ul>
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<h4 id="pattern-matching">Pattern matching</h4>
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<p>Subscription patterns match in three ways:</p>
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<ul>
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<li><strong>Exact</strong> — <code>"order:created"</code> matches only that topic.</li>
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<li><strong>Prefix</strong> — <code>"order:*"</code> matches any topic starting with <code>"order:"</code>.</li>
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<li><strong>Everything</strong> — <code>"*"</code> matches all topics.</li>
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</ul>
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<h4 id="memorydriver-pubsubdriver"><code>memoryDriver(): PubSubDriver</code></h4>
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<p>The default in-process driver. Handlers are invoked synchronously (fire-and-forget for async handlers) whenever a published topic matches a registered pattern.</p>
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<pre data-language="ts"><code>interface PubSubDriver {
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publish(topic: string, message: unknown): void | Promise<void>;
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subscribe(pattern: string, handler: Handler): () => void;
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}</code></pre>
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<h4 id="wrnexus-pubsub-redis-redisdriver-url"><code>@wrnexus/pubsub/redis</code> — <code>redisDriver(url?)</code></h4>
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<p>A cross-process driver backed by Redis. It speaks RESP over a raw TCP socket via <code>Bun.connect</code>, so it adds <strong>no npm dependency</strong>. <code>url</code> defaults to <code>$REDIS_URL</code>, then <code>redis://localhost:6379</code>. The URL may carry a password and a database index (e.g. <code>redis://:secret@host:6379/2</code>).</p>
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<pre data-language="ts"><code>function redisDriver(url?: string): PubSubDriver & { close(): void };</code></pre>
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<ul>
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<li>Exact topics use Redis <code>SUBSCRIBE</code>; wildcard patterns (<code>ns:*</code>, <code>*</code>) use</li>
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<p><code>PSUBSCRIBE</code>, whose glob semantics line up with this library's matching.</p>
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<li>Messages are JSON-stringified on publish and <code>JSON.parse</code>d on receipt; a payload</li>
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<p>that isn't valid JSON is delivered as the raw string.</p>
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<li><code>close()</code> tears down both the subscriber and publisher connections.</li>
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</ul>
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<h4 id="resp-codec-internal">RESP codec (internal)</h4>
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<p><code>redis.ts</code> uses a minimal RESP implementation exported from <code>resp.ts</code> (<code>encodeCommand</code>, <code>parseReply</code>, <code>concat</code>, and the <code>RespValue</code> type). These are implementation details of the Redis driver, not part of the public package entry.</p>
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<h3 id="usage">Usage</h3>
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<p>In-process (default):</p>
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<pre data-language="ts"><code>import { createPubSub } from "@wrnexus/pubsub";
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const bus = createPubSub();
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const off = bus.subscribe("order:*", (msg, topic) => {
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console.log(topic, msg);
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});
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await bus.publish("order:created", { id: 7 });
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off(); // unsubscribe</code></pre>
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<p>Cross-process with Redis:</p>
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<pre data-language="ts"><code>import { createPubSub } from "@wrnexus/pubsub";
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import { redisDriver } from "@wrnexus/pubsub/redis";
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const driver = redisDriver("redis://localhost:6379");
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const bus = createPubSub(driver);
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bus.subscribe("order:*", (msg, topic) => {
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// received on any app process subscribed to this pattern
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});
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await bus.publish("order:created", { id: 7 });
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// on shutdown
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driver.close();</code></pre>
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<h3 id="requirements-notes">Requirements / Notes</h3>
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<ul>
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<li><strong>Bun-only.</strong> The Redis driver depends on <code>Bun.connect</code>; it throws</li>
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<p><code>redisDriver requires the Bun runtime (Bun.connect).</code> outside Bun. The default in-memory driver has no runtime dependencies.</p>
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<li>The Redis driver reads <code>REDIS_URL</code> from the environment when no <code>url</code> is passed.</li>
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<li>Backs [<code>@wrnexus/core</code>](../core)'s realtime bridge for horizontal scaling.</li>
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<li>No external npm dependencies — the Redis client is a self-contained RESP codec.</li>
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</ul></section><section id="api" class="api"><h2>Complete TypeScript API</h2><p>Generated from the exact installed package declarations.</p><pre data-language="typescript"><code>interface MessageEnvelope<T = unknown> {
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id: string;
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topic: string;
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data: T;
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timestamp: number;
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attempts: number;
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}
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interface ResilientPubSubOptions {
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retries?: number;
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retryDelayMs?: number;
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onError?: (error: unknown, envelope: MessageEnvelope) => void;
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}
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declare function createResilientPubSub(driver: PubSubDriver, options?: ResilientPubSubOptions): PubSub;
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interface PresenceMember {
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id: string;
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metadata?: Record<string, unknown>;
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joinedAt: number;
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expiresAt: number;
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}
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declare class PresenceChannel {
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#private;
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private readonly ttlMs;
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private readonly now;
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constructor(ttlMs?: number, now?: () => number);
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touch(id: string, metadata?: Record<string, unknown>): PresenceMember;
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leave(id: string): boolean;
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list(): PresenceMember[];
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prune(): number;
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}
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/**
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* @wrnexus/pubsub — topic-based publish/subscribe with a pluggable driver.
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* The default is in-process; swap in a Redis/NATS driver for cross-instance
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* messaging (it also backs @wrnexus/core's realtime bridge).
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*
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* const bus = createPubSub();
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* const off = bus.subscribe("order:*", (msg, topic) => {...});
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* await bus.publish("order:created", { id: 7 });
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*
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* Subscriptions match exact topics, "ns:*" prefixes, and "*" (everything).
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*/
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type Handler<T = unknown> = (message: T, topic: string) => void | Promise<void>;
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interface PubSubDriver {
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publish(topic: string, message: unknown): void | Promise<void>;
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subscribe(pattern: string, handler: Handler): () => void;
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}
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interface PubSub {
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publish<T = unknown>(topic: string, message: T): Promise<void>;
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subscribe<T = unknown>(pattern: string, handler: Handler<T>): () => void;
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}
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/** In-process pub/sub driver (default). */
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declare function memoryDriver(): PubSubDriver;
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/** Create a pub/sub bus over a driver (in-memory by default). */
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declare function createPubSub(driver?: PubSubDriver): PubSub;
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export { type Handler, type MessageEnvelope, PresenceChannel, type PresenceMember, type PubSub, type PubSubDriver, type ResilientPubSubOptions, createPubSub, createResilientPubSub, memoryDriver };
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</code></pre></section><section id="examples" class="examples"><h2>Examples</h2><p>Copy-ready examples from the installed package documentation.</p><div class="example-grid"><article class="example-card"><h3>In-process (default)</h3><pre data-language="ts"><code>import { createPubSub } from "@wrnexus/pubsub";
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const bus = createPubSub();
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const off = bus.subscribe("order:*", (msg, topic) => {
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console.log(topic, msg);
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});
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await bus.publish("order:created", { id: 7 });
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off(); // unsubscribe</code></pre></article><article class="example-card"><h3>Cross-process with Redis</h3><pre data-language="ts"><code>import { createPubSub } from "@wrnexus/pubsub";
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import { redisDriver } from "@wrnexus/pubsub/redis";
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const driver = redisDriver("redis://localhost:6379");
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const bus = createPubSub(driver);
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bus.subscribe("order:*", (msg, topic) => {
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// received on any app process subscribed to this pattern
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});
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await bus.publish("order:created", { id: 7 });
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// on shutdown
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driver.close();</code></pre></article></div></section></article>
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<aside class="on-this-page"><h2>On this page</h2><nav><a class="toc-level-2" href="#guide">Guide</a><a class="toc-level-3" href="#overview">Overview</a><a class="toc-level-3" href="#api">API</a><a class="toc-level-4" href="#createpubsub-driver-pubsub">createPubSub(driver?): PubSub</a><a class="toc-level-4" href="#pattern-matching">Pattern matching</a><a class="toc-level-4" href="#memorydriver-pubsubdriver">memoryDriver(): PubSubDriver</a><a class="toc-level-4" href="#wrnexus-pubsub-redis-redisdriver-url">@wrnexus/pubsub/redis — redisDriver(url?)</a><a class="toc-level-4" href="#resp-codec-internal">RESP codec (internal)</a><a class="toc-level-3" href="#usage">Usage</a><a class="toc-level-3" href="#requirements-notes">Requirements / Notes</a><a class="toc-level-2" href="#api">Complete API</a><a class="toc-level-2" href="#examples">Examples</a></nav></aside>
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