/gym_rental

WEC NITK Recruitments Blockchain problem repo

Primary LanguageJavaScript

WEC NITK RECRUITMENTS:

I'm a bit late and I have contacted the mentors as to why. Thanks for allowing time. There's many fine tunes needed, I also didn't deploy but I did all I can under 4 hours. Thanks again :)

Problem Statement:

The task is to write a smart contract for gym machine rental.

● The contract should have exactly one owner (the gym's management)

● Clients can buy access to machines in the gym for time slots of 30 minutes (Each time payment is made for a machine)

● The owner can set the price per time slot whenever he wants.

● Owner can add a new machine anytime he wants

● Anyone can check whether a client has access to the machine at any given time.

● The owner can withdraw the profits to his personal account anytime

Bonus:

● Can set or delegate more than one owner.

● Use solidity practices and features to minimise gas costs.

● Use Modifiers, events and comments to increase readability and debugging.

● Publish the smart contract on a test network

Soln Code -

  • I assume here for owner to have two wallets, one personal & other CentralGymWallet i.e., business account kinda (because the problem asked to allow owner to transfer profits so there should a central place where to store funds from client's transactions I thought and later owner can transfer as much they wish to ownerWallet).
  • several functions are written w.r.t the points mentioned in the questions.
  • onlyOwner is a defined under constructor which when used on function's name acts as modifier and verifying each time whether it's been called by owner/NOT thus giving a check :)
  • When client calls _buyAccesToGym, the funds i.e., msg.value are put to CentralGymWallet which is just a mapping from user's address to an uint value.
  • For client details, the function is public as to allow anyone to call this function & it emit events with message as this can be caught by a JS file and can be also shown using frontend. (NOW, ALL IS VERY PROTOTYPE LEVEL)

POSSIBLE solution as an improvement : each gym equipment can be treated as an asset - as an ERC721 token.