Raffle project: pick winner manually & other modified features

[DorianDaSilva]

Hi,

I was wondering if there is a function that would allow me to run the raffle without using vrf/keepers to pick the winner using randomness ( Since I am having problems with vrf/keepers & chainlink won't be supporting ETH merge PoS)

Maybe a function that can be called by the owner of the contract from the back end that would iterate through the array of wallets that have entered the Raffle to pick a winner or if I can just skip randomness altogether and just pick a winner manually from list of addresses.

• Ideally I would like for that function to run at a set date or time interval of X days.

Another feature would be to include a fee that would be automatically sent to the owner of the Raffle contract everytime the funds are transfered to the winner.

• ex: Winner gets total prize of 1ETH: 90% transfered to the wallet he used to enter raffle & remaining 10% as fee transfered to the wallet of the owner of the Raffle contract

And finally, if I want to host it on a different network I can just replace eth network with whatever network I want to deploy it to and use chainlink feeds and prices for that specific nbetwork, right?

In case I decide to pick winner manually should I just remove checkUpkeep & performUpkeep from the Raffle contract & keep the rest as is to run the raffle on live network?

Any inputs, ideas, recommendations or suggestions on how to do that are more than welcome.

[adityabhattad2021]

I had a idea that pickWinner() would automatically trigger when no' of players gets > 10 or so...

[DorianDaSilva]

@adityabhattad2021 I was looking into this function to pick random winner without vrf/keepers that will no longer be supported after ethereum merge.

I found this function but seems to be outdated:

function random() private view returns(uint) {
    return uint(keccak256(block.difficulty, now, players));
}

pickWinner() public{
   uint index = random() % players.length;
   players[index].transafer(this.balance);
}

But I am not sure it would actually work in our context

Also, still looking for a way to split the funds sent to the winner (90% winner/10% Raffle owner)

[adityabhattad2021]

For this "Also, still looking for a way to split the funds sent to the winner (90% winner/10% Raffle owner)" I think we will need to multiply this.balance with 0.9 for winner and 0.1 for raffle owner.

and actually I am not familier with keccak and block.difficulty in this

function random() private view returns(uint) {
    return uint(keccak256(block.difficulty, now, players));
}

but if we can select random winner then we can call the function inside enterRaffle and check in number of players > 10 (any set number)
and if true we can pick random winner transfer ETH and reset the contract