VS lab

How to use

Generell:

open Docker Desktop
open terminal
- cd to repo folder
- docker-compose up --build --scale boerse=1 --scale bank=4

Workaround for following Error Error response from daemon: driver failed programming external connectivity on endpoint vs-praktikum-bank-1 (19a4a9a43ed074d42706cf0a0f4ee6dc3a035b9713626b66b4d2149065a073b7): Bind for 0.0.0.0:22100 failed: port is already allocated

open docker-compose.yml
bank: ports. 22100 (random port for multiple instances)

P1:

see UDP communication in terminal

P2:

click on port of one bank in Docker Desktop Container
add /kundenportal or /mitarbeiterportal to the url -> should look e.g. so: http://localhost:51349/kundenportal
have fun while playing with our kunden-/mitarbeiterportal

Components

Bank

bank starts up
read csv file
connect to lookup, connect to Börse
starting threads for...
- listen to Börse for trades
- creates socket
- wait for and get messages from Börse
- print out portfolio value and stock values
- start user interface server for P2
  - handle GET/POST requests (a lot of different APIs, e.g. deposit or withdraw)

Boerse

Börse starts up
read stocks csv
gets server settings (IP, Port, etc.)
connect to lookup server
create datagram socket
starting threads for...
- listen for datagrams (saves connected clients, send trades/price changes to all connected clients)
- random price changes
- sends keep alive message to all connected clients
- sends keep alive message to lookup server
- print out current stock prices

Lookup

This is a simple Lookup server. Services can register themselves and clients can lookup the server address.

Each service is identified id chosen by the service itself. The service registers what ip and port it is listening on and what type of service it is.

The client can then lookup the service type and get all available services of a certain type.

All communication is using json. The endpoints are: