denisskin/wow

"Word of Wisdom" TCP Client/Server

"Word of Wisdom" TCP Client/Server

Test task for Server Engineer - Design and implement “Word of Wisdom” tcp server.

Simple "Word of Wisdom" TCP-server implementation.

For each incoming request, generated and send to client a token with given accuracy (1/difficulty). The client needs to find nonce such that the final hash will be with a given accuracy.

hash(token | nonce) < 1 / difficulty

SHA-256 is used as the PoW hash-function.

The current difficulty is determined based on the average number of incoming requests.

difficulty ~ averageCountOfRequests

The difficulty increases proportionally as the number of requests increases. So difficulty limits the number of incoming requests.

Docker container

Build docker

make

Run server

docker run -p 8080:8080 wow-server

Run client

docker run -it wow-client