How to Implement Custom Middleware for Segment Tracking in Angular to Modify Events Dynamically?

Question

I want to implement custom middleware in my Angular application to modify Segment tracking events dynamically before they are sent. The goal is to filter, modify, or enrich events based on specific conditions or rules.

Here’s the approach I’m considering:

Middleware Concept:

I want to create a middleware pipeline that processes each Segment event before it’s tracked.
The middleware should be able to add, remove, or modify event properties and context based on business logic.

Initial Implementation:

import { Injectable } from '@angular/core';
import Analytics from 'analytics-node';

@Injectable({
  providedIn: 'root',
})
export class SegmentService {
  private analytics: Analytics;
  private middleware: Array<(event: any) => any> = [];

  constructor() {
    this.analytics = new Analytics('YOUR_WRITE_KEY');
  }

  use(middlewareFn: (event: any) => any) {
    this.middleware.push(middlewareFn);
  }

  trackEvent(event: string, properties: any, context?: any) {
    let eventObj = { event, properties, context };

    // Apply middleware
    this.middleware.forEach((fn) => {
      eventObj = fn(eventObj);
    });

    this.analytics.track(eventObj);
  }
}

My questions are:

How can I build a robust middleware pipeline for Segment in Angular that allows for complex event processing and conditional logic?
What are the best practices for managing and organizing middleware functions to keep the code maintainable and scalable?
Are there any potential pitfalls or performance considerations to be aware of when implementing custom middleware for Segment tracking in an Angular application?

Idov · Accepted Answer · 2024-08-24 10:06:36Z

Middleware is not a concept native to angular. You can use interceptors, guards, etc, but I'm not familiar with a way to automatically hook to a changed dto in angular and modify it.

Your service can use observables or singals (from angular 16 forward), but in any case you will have to register your service to the observables whenever you want to use the value. However, this is not the approach I'd take, since it is async and would be cumbersome to use.

A simpler, more angular-like approach would be to just use a service like this:

@Injectable()
export class MiddlewareService {

  constructor(private readonly handler1: Handler1, 
    private readonly handler2: Handler2)
  }

  public doStuff(myData: Data): Data {
    //run your handlers and return the modified data
  }
}

And then inject it and use it wherever you like (Don't forget to define your handlers as injectable services as well).

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