Raffle contract documentation

The following functions are present:

openRaffle

Only admin sets the raffle opened.

stopRaffle

Only admin sets the raffle stopped. People can't enter the raffle when it's stopped.

setEntranceFee

Parameters: newEntranceFee - amount of ether in wei https://eth-converter.com/. Sets the new price to enter the raffle

setSubscriptionId

Parameters: newId - this subscription is used by Chainlink. There must always be money on this subscription

setKeyHash

Parameters: bytes32 newKeyHash Used to update Chainlink parameter. In usual conditions don't use it

setPriceFeed

Parameters: new priceFeedAddress Updates price oracle. In usual conditions don't use it

setReffererShare

Parameters: new reffererShare in tens (20% == 200) Use to update refferer's share

finalGame

Asserts that raffle is closed, and returns top 20 addresses. Then admin manually repays the prize.

pay

Only admin can execute. Function uses Chainlink price feed oracle usdt/eth. Parameters: target - address to send money, amountInUsdt - amount of usdt to send.Such that to send $5 you put amountInUsdt = 5. Picks up the current exchange rate between the ether and the dollar and sends equivalent amount of ether to target address.

sendEther

Parameters: target - address to send, amount - amount of Wei to send (10^18 Wei == 1 ETH) Use it to send ether to arbitrary address

enterRaffle

The main function to interact with user. Receives the ether amount not less than entranceFee. Requests Chainlink VRF Coordinator, sets refferer if not set yet, repays to refferer (if exists). Emits event Requested(address indexed player, uint256 requestId)

fulfillRandomWords

Used by VRF Coordinator to mint random ticket. Emits event WinnerChosen(address indexed player, uint256 indexed sum, uint256 indexed tokenId)

Informational functions:

getTicketsLeftBySum

Returns how many tickets are left for this amount. Parameter is amount in usdt.

getTicketsLeft

Returns array of tickets amounts. i'th index corresponds to i'th index in sums array

getTopPlayers

Returns top 20 players with the biggest amount of tickets.

ticketNft

Returns address of ticket nft.

entranceFee

Returns the price of entering the raffle in wei. https://eth-converter.com/

ticketsLeft

Returns the amount of left tickets.

isOpen

Returns true when raffle is open, false when raffle is closed.

reffererShare

Returns share that is repayed to refferer in tens (20% == 200)

numWords(), requestConfirmations(), callbackGasLimit(), keyHash(), subscriptionId()

Returns parameters of Chainlink VRF