How do you plan to use caching in the OrderService architecture? What exactly will be stored in Redis?

In the architecture of OrderService, caching with Redis can be used to speed up access to frequently requested data and reduce the load on the database. In Redis, it is recommended to store:

• Information about the order status (e.g., "processing", "shipped", "delivered") to quickly show the user the current state.
• Frequently requested order details that rarely change, such as the list of products, prices, delivery address.
• User sessions or authentication tokens, if part of the service.

Example of using Redis in Go:

import (
    "github.com/go-redis/redis/v8"
    "context"
    "time"
)

var ctx = context.Background()

func cacheOrderStatus(rdb *redis.Client, orderID string, status string) error {
    key := "order_status:" + orderID
    // Cache the order status for 10 minutes
    return rdb.Set(ctx, key, status, 10*time.Minute).Err()
}

func getOrderStatus(rdb *redis.Client, orderID string) (string, error) {
    key := "order_status:" + orderID
    return rdb.Get(ctx, key).Result()
}

Thus, Redis helps quickly deliver up-to-date information, reducing delays and load on the main database.