Why did you decide to move the segmentation logic to a separate microservice?

Moving segmentation logic to a separate microservice allows for increased modularity and scalability of the system. This solution offers several advantages:

• Responsibility isolation: the microservice is only responsible for segmentation, simplifying support and development.
• Scalability: the service can be scaled independently of the rest of the system, which is important under high loads.
• Reusability: different parts of the system or even different projects can use the same segmentation service.
• Simplified deployment: changes in segmentation logic do not require deploying the entire application.

An example in Go, a simplified segmentation microservice:

package main

import (
    "encoding/json"
    "net/http"
)

type User struct {
    ID    string `json:"id"`
    Age   int    `json:"age"`
    Country string `json:"country"`
}

type SegmentResponse struct {
    Segment string `json:"segment"`
}

func segmentHandler(w http.ResponseWriter, r *http.Request) {
    var user User
    if err := json.NewDecoder(r.Body).Decode(&user); err != nil {
        http.Error(w, "Invalid input", http.StatusBadRequest)
        return
    }

    segment := "default"
    if user.Age < 18 {
        segment = "youth"
    } else if user.Country == "RU" {
        segment = "russian"
    }

    resp := SegmentResponse{Segment: segment}
    json.NewEncoder(w).Encode(resp)
}

func main() {
    http.HandleFunc("/segment", segmentHandler)
    http.ListenAndServe(":8080", nil)
}

This service can be easily integrated with other components via HTTP API.