High-Level Design

There are 2 services for front-end
- web-application for users who access the app from the browser
- phone application for users who acces the app from mobile
engage-service: will manage all the likes and retweets actions
follow-service: This service will be responsible to manage all relationship users, like follow and unfollow relationshio
- every time a user follow/unfollow someone the follow-service will control this relationship.
- everytime a user have more than 5k of followers it will create a element on queue
- everytime that has previous 5k of follower and the count of follower decrease to 4.999 follower, it will create a element on queue
- this queue will be an sqs to be consumed on top-user-service
user-service: it is responsible to manage the login, create account, and delete account process
fan-out workers: will show all tweets on timeline users
- it will show all sugested tweets of top users. The search will occur accessing the top-user-service
- it will show all following users tweet, the search will be made on redis-cache
timeline-cache-service:
- this will use fanout write strategy
- will consume tweets from sqs-tweet posted by tweet-register
- will not consume tweets if it from top-user-service
- for every tweet, it will search all the follower users and create a register on redis-cache to be consumed to show on timeline-service
tweet-register:
- Every time a user post a tweet, it will post this tweet on sqs-tweet to be consumed on time-cache-service
top-user-service:
- It will store all users that have more than 5k followers.
- will be responsible to retrieve those users recents posts

The flow of tweet

A user post or delete a tweet
the tweet is persisted or deleted on tweet-database by tweet-register
the tweet-register post the action o sqs-tweet
the fan-out workers consumes this action and put or delete the tweet on redis cache
the timeline-service consumes all the tweets from redis-cache from normal users and consume the tweet directly from top-user-service.

Timeline:

will get the first 50 posts on redis-cache
if more feeds needed, it will start to search tweets on tweet-register, and add on redis-cache

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