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About

Build Status

This is a minimal lottery smart contract for education and demonstration purposes. All interaction with the contract takes place via the fallback function. This allows generic wallet applications to interact with it via simple send transactions, instead of requiring a dedicated Dapp.

Release

A set of contracts has been deployed on the ARTIS Blockchain The runtime of those contracts is 60 Blocks (~ 5 Minutes). After a payout the Lottery Pauses 30 Blocks (~ 3 Minutes).

ATS Address
1 0x285a8c43a3165B21D19B51D7B27f11207a5E9D2d
5 0x907E458ED23Eb25bAAC4F36601D9A85019a8dfD9
10 0x9A360704dB0EdB4Ce60C0695dFC65A8d1d9230f4
Any 0xcA3F9373d769734aB8a58b2f4020aD42014Ba793

The bid amount of the "Any" Lottery is determined by the first valid transaction within a round.

Build

This is a truffle project. After cloning the repo, run npm ci in order to get the npm dependencies. Nodejs v10+ required. Now you should have the truffle binary installed at node_modules/.bin/truffle and can start your exploration.

Test

Run npm run test.

REPL

A good way to explore is to start a truffle console with node_modules/.bin/truffle develop. Now you have a REPL which offers you the API of web3.js combined with the truffle API and its convenient contract wrappers. E.g. in order to deploy and query an instance of the lottery contract, you could now have a session like this:

truffle(develop)>  var roundRuntimeInBlocks='5'; //lottery should pay out after minimum of 5 blocks
undefined
truffle(develop)> var minPauseRuntimeInBlocks='3'; //lottery should go into a pause state after payout for a minimum of 3 blocks
undefined
truffle(develop)> var bidAmount=web3.utils.toWei('1'); //the bid amount for this lottery should be 1.
undefined
truffle(develop)> bidAmount // the amount in Wei is 1E18.
'1000000000000000000'
truffle(develop)> var lottery = await EduLottery.new(bidAmount, roundRuntimeInBlocks, minPauseRuntimeInBlocks)
undefined
truffle(develop)> accs = await web3.eth.getAccounts()
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[0], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[1], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[2], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[3], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[4], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> tx = await web3.eth.sendTransaction({ from: accs[5], to: lottery.address, value: bidAmount })
undefined
truffle(develop)> await web3.eth.getBalance(accs[0]) // lets check the balances of each account for now.
'98999902358000000000'
truffle(develop)> await web3.eth.getBalance(accs[1]) // account 1 is the winner in this case
'103987308546000000000'
truffle(develop)> await web3.eth.getBalance(accs[2])
'98999902358000000000'
truffle(develop)> await web3.eth.getBalance(accs[3])
'98999902358000000000'
truffle(develop)> await web3.eth.getBalance(accs[4])
'98999902358000000000'
truffle(develop)> await web3.eth.getBalance(accs[5]) // account 5 dit not even participate in the lottery, he just triggered the payout, and payed the transaction fees.
'99999924472000000000'

Open questions? -> Gitter