bormonoff/http-currency-exchange

Main repo goal

Recently I got an interesting task. Within which I have to realize client/server currency exchange service. I decided to use HTTP (instead of TCP) protocol for a number of reasons. The main reason is that each big service has a browser entrypoint. So in the future we can easily write frontend for our service and everything will work (instead of writing a new server).

How to launch

The instruction is the same for both the client and the server. Install Conan using PIP on your mashine. If you have Ubuntu use the following commands. If you use Arch download pip using pacman. sudo apt install python3-pip sudo pip install conan==1.* Clone this repository. Inside server and client folder write the second commands: mkdir build && cd build conan install .. --build=missing -s compiler.libcxx=libstdc++11 -s build_type=Release cmake -DCMAKE_BUILD_TYPE=Release .. cmake --build . Run compiled programs from the build/bin/ directory. When client is launched write "Help" to see the possible commands. NOTE that you can launch as many clients as you want but you can run only one server.

Technical task

What to do: You have to write a simple exchange service. This service will buy roubles and sell dollars. Server has to get exchange orders from brokers and buy/sell their currency. If broker orders match, server should handle and match their bets. Server has to: be able to serve several tasks at the same time. Moreover it should give broker the ability to get all the current bets, complete bets and current client balance. Client has to: conect to the server and realize all it's abilities. Buiseness model: Order has a value, price and sell/buy flag. Order is active while it has an active value If two orders have the same price server should use the first in time If one bet intersect with several bets the priority is given to bigger price (buy bets) and lower price (sell bets) A bet can be carried out partially Client has an infinite balance Logic example: Broker 1 has created sell order: 10 USD for 61 RUB Broker 1 has created sell order: 20 USD for 62 RUB Broker 1 has created buy order: 50 USD for 63 RUB As the result we have: Broker 1 balance is (10 USD, -620 RUB) Broker 2 balance is (20 USD, -1260 RUB) Broker 3 balance is (-30 USD, 1880 RUB) Optionaly you can realize: The ability the client to view current orders The ability to notify all bet brokers after the complete order The ability the client to remove orders The ability the server to save all order history to PostgreSQL Authorization broker via password GUI Via QT Realization requirements: Client can be console app All main functions should be covered via tests Technical requirements: Project should be written via C++17/C++20 You can use any libraries you want Project has to be compiled via CMake