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blockbid-message
Advanced tools
This library makes it easy to send messages in a distributed network transparent way via various brokers but initially via RabbitMQ.
Readme
This library makes it easy to send messages in a distributed network transparent way via various brokers but initially via RabbitMQ.
At a later point we should have plugins to make it work with various messaging paradigms:
blockbid-messages/amqp
requires node. blockbid-messages/socketio-browser
may require browser objects. (YTBI)blockbid-tools
and ensure it supports versioningYou can install by referencing a version tag directly off the github repo.
yarn add blockbid/blockbid-message#<semverish>
import { createConsumer, createProducer } from 'blockbid-message';
import { filter } from 'rxjs/opeerators';
// createProducer accepts a list of middleware
// the message passes top down
// It returns an RxJS Observer that sends messages
const producer = createProducer(
transformMessageSomehow,
broadCastsMessagesSomewhere
);
// createConsumer also accepts a list of middleware
// the message also passes top down
// It returns an RxJS Observable that will receive the message
const consumer = createConsumer(
receivesMessagesFromSomewhere,
logOrTransformMessage,
doSomeMoreTransformation
);
// Use RxJS's Observable#next() method to send a message
producer.next({
content: 'Hello World!',
route: 'hello'
});
// Note that because consumer is simply an RxJS observable
// you can apply filtering and throttling or do whatever you want to it
const sub = consumer
.pipe(filter(msg => msg.content.toLowerCase().includes('world')))
.subscribe(msg => {
console.log(`Received: ${msg.content}`);
});
Generic message objects look like this:
// Generic message
export interface IMessage {
content: any;
route?: any;
}
You might use a message by sending it to the next()
method of a producer.
producer.next({
content: 'Hi there!',
route: 'some-queue'
});
Middleware are effectively functions designed to decorate RxJS streams and looks like this:
// Generic Middleware decorates a stream
export type Middleware<T extends IMessage> = (
a: Observable<T>
) => Observable<T>;
You might use a middleware by passing it as one of the arguments to the createProducer()
or createConsumer()
functions
import {tap} from 'rxjs/operators';
function logger(stream: Observable<IMessage>) {
return stream
.pipe(tap(
(msg:IMessage) => console.log(`Stream logged: ${msg.content}`
));
}
// Pass the middleware in order to the consumer or producer
const consumer = createConsumer(someReceiver, logger);
AMQP Middleware is designed to work in Node environments only due to limitations with the amqplib package it is based on.
import { createConsumer, createProducer } from 'blockbid-message';
import { createAmqpConnector } from 'blockbid-message/amqp';
const { sender, receiver } = createAmqpConnector({
declarations: {
// This declares the queue you want to use
queues: [
{
durable: false,
name: 'hello'
}
]
},
uri: 'amqp://user:password@somerabbitserver.io/user'
});
// Here is an RxJS Observer that sends the message
const producer = createProducer(sender());
producer.next({
content: 'Hello World!',
route: 'hello'
});
// Here is an RxJS Observable that will receive the message
const consumer = createConsumer(
receiver({
noAck: true,
queue: 'hello'
})
);
const sub = consumer.subscribe(msg => {
console.log(`Received: ${msg.content}`);
});
sub.unsubscribe();
For usage and examples please look at the basic tests thrown together here
blockbid-message
uses RxJS v6.0 so you need to pipe all your operators:
import { filter } from 'rxjs/operators';
// ...
consumer.pipe(filter(forUserEvents(userId))).subscribe(
msg => {
dealWithMessage(msg.content);
},
() => {}
);
FAQs
This library makes it easy to send messages in a distributed network transparent way via various brokers but initially via RabbitMQ.
The npm package blockbid-message receives a total of 0 weekly downloads. As such, blockbid-message popularity was classified as not popular.
We found that blockbid-message demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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