Room Reservation System

Example application created for the presentation on GopherCon Russia 2019 (slides).

There are 3 versions of this application:

• 1.0 - just HTTP handler
• 2.0 - using Watermill to handle payment initialization in the background
• 3.0 - using Watermill CQRS component for initializing payments and counting bookings

Database adapters (in memory in this case) and domain layer is shared by all application versions.

Warning: this repository is using some Watermill unreleased features, which are still not released, like NewPoisonQueueWithFilter or CorrelationIDWithAutogenerate. They are now on cqrs-fix branch and will be released in v0.4.0.

Up and running

For v2.0 and v3.0 you need Kafka. You can use docker-compose to run it:

docker-compose up

If you need some help with docker-compose setup, you should check our article about local Golang development environment.

And then you should run cmd/main.go from application version which you want to run.

cd 3.0/cmd/
go run .

Booking a room

You can book a room using REST API using https://httpie.org/.

http POST localhost:6060/book-room RoomID=10 StartTime=2018-09-22T12:42:31Z EndTime=2018-09-22T12:42:31Z GuestsCount:=2 PaymentChannel="paypal" -v

TODO

• Update Watermill to the last release (some changes to CQRS need to be merged to the Watermill's master from cqrs-fix branch)
• Some code cleanups and TODO's fixes
• Slides link
• Detailed description

Support

Please join us on the #watermill channel on the Gophers slack: You can get invite here.