I implement this project without using any framework and ORM
for best performance , scalability.
for the purpose of this project I didn't implement all needed features
so interfaces don't contain all needed methods ,
and I didn't implement JSON response generator,swagger,sentry etc.
and also I didn't implement docker-compose version for production.
I know using real database for writing test is wrong , and I must write mock for that,
but for the purpose of this project and saving time I kept it simple.
Used standard library for routing not any framework and no ORM used.
No external packages that make the performance lower used.
Used fastjson library instead of json and encoding in standard library to
speed up parsing json It's about 15x faster.
Used pgx as database interface because
we only use PostgreSQL as database and its faster than database/sql package in standard library.
The architecture of this project is clean architecture,
I created an image to help you understand architecture of this project better.
Used interface for getting tools like logger, db, memoryDB so using another tool for example another
logger or db don't force you to edit all codes of different layers.
Used uber fx as dependency injection system
to increase readability and save more memory.
My solution is using redis as in memory DB and storing segment user counts
every 24 hours on 00:00AM.
so we only execute a postgres query every 24 hours and we have needed data for next day.
note:for your comfort in testing I just set scheduling period duration every 30seconds not every 24 hours.
git clone https://github.com/mahdimehrabi/go-challenge.git
copy env file
cd gin-gorm-boilerplate
cp env.example .env
create docker volume and start
docker volume create psql_data
docker-compose up -d
create database
docker-compose exec database psql -U root
CREATE DATABASE challenge;
run migrations
make migrate-up
run tests
make test-all
generate some users (seed), this command create between 1 and 1000 random users
,so feel free to use this command as many times as you want to create more users.
make seed
now please edit a file(just add new line or tab or space is enought) and save (to restart delve server)
or restart docker-compose docker-compose down && docker-compsoe up -d
POST localhost:8000/users Create new user send
example request data
{
"ID":"fsas42aa3af",
"segment":"1aa1x",
"expiredSegment":1655209411
}
GET localhost:8000/segments/count get segments and it user counts
example response data
[
{"title":"RU","usersCount":50052132},
{"title":"z12XTowIA2","usersCount":45235009}
]