npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@6river/pubcap

v3.0.1

Published

Google Pub/Sub message Capture

Downloads

162

Readme

PubCap

PubCap is designed to capture messages published to Google Pub/Sub topics.

Install and Setup

Install the component as development dependency:

npm i @sixriver/pubcap -D

Usage

Bellow is the typical setup for Mocha framework.

Setup before/after hooks to register topics being listened and the code to cleanup the mess after the tests are over:


const pubcap = new PubCap({

});

before(async function() {
	await pubcap.listen(pubsub, ['topic1', 'topic2']);
});

after(async function() {
	await pubcap.close();
});

Optionally setup beforeEach or afterEach hook to drain messages from the registered topics:

beforeEach(async function() {
	await pubcap.drain();
})

Access captured messages using PubCap#messages method:

it('should capture messages', async function() {
	const myMessages = await pubcap.messages('my-topic');
	// ...
});

Getting Raw Pub/Sub messages

Method PubCap#messages by default returns the result of JSON.parse(msg.data.toString()). Use Raw decoder to get raw Pub/Sub messages:

import {PubCap, RAW} from '@6river/pubcap';

const pubcap = new PubCap();
// ...
const messages = await pubcap.messages('my-topic', {decoder: RAW});

Writing your own message decoder

Implement the Decoder interface to get raw messages converted some custom (or typesafe) way.


import {Message} from '@google-cloud/pubsub';
import {Decoder, PubCap} from '@6river/pubcap';

// Suppose we have some message type
interface FooMessage {
	id: string;
	foo: boolean;
}

// Here is our decoder
class FooDecoder implements Decoder<FooMessage> {
	decode(msg: Message): FooMessage {
		const foo: FooMessage = ...
		return foo;
	}
}


// now make the decoder and use it
const decoder = new FooDecoder();
const messages = await pubcap.messages('my-topic', {decoder});

Se also

test/pubcap.spec.ts as an example.