Jon Staab
63 lines
3.0 KiB
Markdown
63 lines
3.0 KiB
Markdown
# Paravel [](https://npmjs.com/package/paravel)
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A nostr toolkit focused on creating highly a configurable client system. What paravel provides is less a library of code than a library of abstractions. Odds are you will end up creating a custom implementation of every component to suit your needs, but if you start with paravel that will be much easier than if you pile on parameters over time.
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## /util
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Some general-purpose utilities used in paravel.
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- `Deferred` is just a promise with `resolve` and `reject` methods.
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- `Emitter` extends EventEmitter to support `emitter.on('*', ...)`.
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- `Fluent` is a wrapper around arrays with chained methods that modify and copy the underlying array.
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- `Kinds` contains kind constants and related utility functions.
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- `LRUCache` is an implementation of an LRU cache.
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- `Queue` is an implementation of an asynchronous queue.
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- `Relays` contains utilities related to relays.
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- `Router` is a utility for selecting relay urls based on user preferences and protocol hints.
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- `Tags` and `Tag` extend `Fluent` to provide a convenient way to access and modify tags.
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- `Tools` is a collection of general-purpose utility functions.
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## /connect
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Utilities having to do with connection management and nostr messages.
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- `ConnectionMeta` tracks stats for a given `Connection`.
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- `Connection` is a wrapper for `Socket` with send and receive queues, and a `ConnectionMeta` instance.
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- `Executor` implements common nostr flows on `target`
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- `Pool` is a thin wrapper around `Map` for use with `Relay`s.
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- `Socket` is a wrapper around isomorphic-ws that handles json parsing/serialization.
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- `Subscription` is a higher-level utility for making requests against multiple nostr relays.
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## /connect/target
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Executor targets extend `Emitter`, and have a `send` method, a `cleanup` method, and a `connections` getter. They are intended to be passed to an `Executor` for use.
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- `Multi` allows you to compose multiple targets together.
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- `Plex` takes an array of urls and a `Connection` and sends and receives wrapped nostr messages over that connection.
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- `Relay` takes a `Connection` and provides listeners for different verbs.
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- `Relays` takes an array of `Connection`s and provides listeners for different verbs, merging all events into a single stream.
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# Example
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Functionality is split into small chunks to allow for changing out implementations as needed. This is useful when attempting to support novel use cases. Here's a simple implementation of an agent that can use a multiplexer if enabled, or can fall back to communicating directly with all relays.
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```javascript
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class Agent {
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pool = new Pool()
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constructor(readonly multiplexerUrl: string) {}
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getTarget(urls) {
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return this.multiplexerUrl
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? new Plex(urls, this.pool.get(this.multiplexerUrl))
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: new Relays(urls.map(url => this.pool.get(url)))
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}
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subscribe(urls, filters, id, {onEvent, onEose}) {
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const executor = new Executor(this.getTarget(urls))
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return executor.subscribe(filters, id, {onEvent, onEose})
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}
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}
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```
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