graphql-amqp-subscriptions
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GraphQL AMQP Subscriptions
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# graphql-amqp-subscriptions
This package implements the PubSubEngine Interface from the [graphql-subscriptions](https://github.com/apollographql/graphql-subscriptions) package.
It allows you to connect your subscriptions manager to a AMQP PubSub mechanism.
This package is influenced by [graphql-redis-subscriptions](https://github.com/davidyaha/graphql-redis-subscriptions) and [graphql-rabbitmq-subscriptions](https://github.com/cdmbase/graphql-rabbitmq-subscriptions).
[](https://www.npmjs.com/package/graphql-amqp-subscriptions)
[](https://www.npmjs.com/package/graphql-amqp-subscriptions)
## graphql-subscriptions@2
If you are using `graphql-subscriptions@2.x` please use `graphql-amqp-subscriptions@2`.
## Basic usage
```javascript
import { AMQPPubSub } from 'graphql-amqp-subscriptions';
import amqp from 'amqplib';
amqp.connect('amqp://guest:guest@localhost:5672?heartbeat=30')
.then(conn => {
const pubsub = new AMQPPubSub({
connection: conn
/* exchange: {
name: 'exchange',
type: 'topic',
options: {
durable: false,
autoDelete: true
}
},
queue: {
name: 'queue'
options: {
exclusive: true,
durable: true,
autoDelete: true
},
unbindOnDispose: false;
deleteOnDispose: false;
} */
});
// Use the pubsub instance from here on
})
.catch(err => {
console.error(err);
});
```
## Benefits
- Reusing existing [amqplib](https://github.com/squaremo/amqp.node) Connection
- Reusing channels (one for subscriptions, one for publishing)
- Performance/Ressource-usage benefits on AMQP (RabbitMQ) because of the aforementioned reasons [more info](https://www.cloudamqp.com/blog/2018-01-19-part4-rabbitmq-13-common-errors.html)
- Using Topic Exchange (e.g. you publish to `agreements.eu.berlin.headstore` and subscribe to `agreements.eu.#`) [more info](https://www.cloudamqp.com/blog/2015-09-03-part4-rabbitmq-for-beginners-exchanges-routing-keys-bindings.html)
## Debug
This package uses Debug.
To show the logs run your app with the environment variable DEBUG="AMQPPubSub"
## Tests
You'll need to have a local AMPQ instance such as RabbitMQ running to run tests.
If you have [Docker](https://www.docker.com/), you can run:
```bash
docker run --hostname my-rabbit -p 5672:5672 rabbitmq:3
```
Then
```bash
npm test
```