meghajit / kau Goto Github PK

When complete, Kau will expose websocket APIs which can be used to deliver and receive messages for a registered user.

As part of this story, the scope is to build a CLI client which can do the following: ( scope is limited as of now, but the client can be enhanced further as more features get added onto Kau)

1. Register/Onboard a user onto Kau
2. Securely login a user into Kau
3. Allow sending a message to another online registered user
4. Allow receiving messages when online from another registered user
5. Show notification indicator when a user has transitioned from OFFLINE -> ONLINE and other users have sent him messages

ACCEPTANCE CRITERIA:

GIVEN 2 users Alex and Jake are connected to Kau server
AND both of them have a stable internet connection throughout the session

WHEN Alex sends one or more text messages to Jake sequentially

THEN Jake should be able to receive and see them as coming from Alex in the same order

TASKS:

1. Create the data types and related handler classes required to support the architecture
2. Embed a Websocket Jetty server in the App Master
3. Setup RabbitMQ connection between App Master and Worker instances
4. Setup HAProxy for LoadBalancing and make it Websocket aware
5. Setup Redis and NoSQL. ( Can go with single instance for now. Cluster setup can be part of a separate story)

AS Alex

GIVEN Alex goes offline at time T
AND Alex has seen all messages sent to him till time T-1

WHEN Alex goes offline at time T+1
AND comes back online at time T+m, where m is any time unit
AND other users have sent messages to Alex between T+1 till T+m

THEN Alex should receive all messages that were sent between T+1 and T+m
AND Alex should see these messages in chronological order for each sender