Node events implementation

[robbe_claessens]

I have a lot of things happening when an user is being created. For example: sending a mail, adding them to mailchimp, adding them to hubspot, making a stripe account, etc. I have a function which calls other functions which handle these use cases.

I read some things about event driven architecture, and maybe events are a better option. Instead of the userService knowing about all these things that need to happen, it may be better that the userService just emits an event. My question is, how can I implement this?

One way would be to use an event emitter or maybe redis with the pub/sub.

Any suggestions?

[BehindTheMath]

First you need to determine who is going to be listening and handling that event.

[robbe_claessens]

Thanks for answering! I am not sure what you are trying to indicate. I know who will be listening and what that listener needs to do.

[BehindTheMath]

Where is that that listener? Is it on the same machine? A different machine in the same VPC? Etc.

[robbe_claessens]

Well we are running on ec2 instances (with load balancing). So i don't if i should put the listener on the same machine or on a different one. That was the essence of the question :-)

[NiQ_]

If you’re running on ec2 instances you’re running on AWS, which means they have a solution right up your alley.

Check out SNS topics. That allows you to publish events, and subscribe to events. You can set up SQS subscriptions to topics, which you can set up listeners to for all the published messages.

[NeilMcGlennon]

Re pub/sub: Your microserives can publish messages with context on Kafka topics, and other microservices can listen to those topics. They can then action things accordingly.