SC CODE: /* Lottery Smart Contract Example in DVM-BASIC.
This lottery smart contract will give lottery wins on every second try in following default contract.
Make depost transaction to this SCID to play lottery.
Check https://github.com/deroproject/derohe/blob/main/guide/examples/lottery_sc_guide.md
*/
Function Lottery() Uint64
10 dim deposit_count,winner as Uint64
20 LET deposit_count = LOAD("deposit_count")+1
25 IF DEROVALUE() == 0 THEN GOTO 110 // if deposit amount is 0, simply return
30 STORE("depositor_address" + (deposit_count-1), SIGNER()) // store address for later on payment
40 STORE("deposit_total", LOAD("deposit_total") + DEROVALUE() )
50 STORE("deposit_count",deposit_count)
60 IF LOAD("lotteryeveryXdeposit") > deposit_count THEN GOTO 110 // we will wait till X players join in
// we are here means all players have joined in, roll the DICE,
70 LET winner = RANDOM() % deposit_count // we have a winner
80 SEND_DERO_TO_ADDRESS(LOAD("depositor_address" + winner) , LOAD("lotterygiveback")*LOAD("deposit_total")/10000)
// Re-Initialize for another round
90 STORE("deposit_count", 0) // initial players
100 STORE("deposit_total", 0) // total deposit of all players
110 RETURN 0
End Function
// This function is used to initialize parameters during install time
// Smart contract authors should hardcode their intended address for contract ownership, then add a check within the Initialize() or InitializePrivate() functions to ensure that the caller is the true owner.
Function Initialize() Uint64
10 IF SIGNER() == address_raw("dero1qy4fxqwqrwmsny5uuypwyh5rhhdzglr3ylx77sglhzr5klmyqya36qgvmh5k2") THEN GOTO 30 //Exit unless smart contract owner.
20 RETURN 0 // exit
30 version("1.2.3")
40 STORE("owner", SIGNER()) // store in DB ["owner"] = address
50 STORE("lotteryeveryXdeposit", 2) // lottery will reward every X deposits
// How much will lottery giveback in 1/10000 parts, granularity .01 %
60 STORE("lotterygiveback", 9900) // lottery will give reward 99% of deposits, 1 % is accumulated for owner to withdraw
70 STORE("deposit_count", 0) // initial players
80 STORE("deposit_total", 0) // total deposit of all players
90 RETURN 0
End Function
// Function to tune lottery parameters
Function TuneLotteryParameters(input Uint64, lotteryeveryXdeposit Uint64, lotterygiveback Uint64) Uint64
10 dim key,stored_owner as String
20 dim value_uint64 as Uint64
30 IF LOAD("owner") == SIGNER() THEN GOTO 100 // check whether owner is real owner
40 RETURN 1
100 STORE("lotteryeveryXdeposit", lotteryeveryXdeposit) // lottery will reward every X deposits
130 STORE("lotterygiveback", value_uint64) // how much will lottery giveback in 1/10000 parts, granularity .01 %
140 RETURN 0 // return success
End Function
// This function is used to change owner
// owner is an string form of address
Function TransferOwnership(newowner String) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 STORE("tmpowner",ADDRESS_RAW(newowner))
40 RETURN 0
End Function
// Until the new owner claims ownership, existing owner remains owner
Function ClaimOwnership() Uint64
10 IF LOAD("tmpowner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 STORE("owner",SIGNER()) // ownership claim successful
40 RETURN 0
End Function
// If signer is owner, withdraw any requested funds
// If everthing is okay, they will be showing in signers wallet
Function Withdraw( amount Uint64) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 SEND_DERO_TO_ADDRESS(SIGNER(),amount)
40 RETURN 0
End Function
// If signer is owner, provide him rights to update code anytime
// make sure update is always available to SC
Function UpdateCode( code String) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 UPDATE_SC_CODE(code)
40 RETURN 0
End Function |
| SC Arguments: [Name:SC_ACTION Type:uint64 Value:'1' Name:SC_CODE Type:string Value:'/* Lottery Smart Contract Example in DVM-BASIC.
This lottery smart contract will give lottery wins on every second try in following default contract.
Make depost transaction to this SCID to play lottery.
Check https://github.com/deroproject/derohe/blob/main/guide/examples/lottery_sc_guide.md
*/
Function Lottery() Uint64
10 dim deposit_count,winner as Uint64
20 LET deposit_count = LOAD("deposit_count")+1
25 IF DEROVALUE() == 0 THEN GOTO 110 // if deposit amount is 0, simply return
30 STORE("depositor_address" + (deposit_count-1), SIGNER()) // store address for later on payment
40 STORE("deposit_total", LOAD("deposit_total") + DEROVALUE() )
50 STORE("deposit_count",deposit_count)
60 IF LOAD("lotteryeveryXdeposit") > deposit_count THEN GOTO 110 // we will wait till X players join in
// we are here means all players have joined in, roll the DICE,
70 LET winner = RANDOM() % deposit_count // we have a winner
80 SEND_DERO_TO_ADDRESS(LOAD("depositor_address" + winner) , LOAD("lotterygiveback")*LOAD("deposit_total")/10000)
// Re-Initialize for another round
90 STORE("deposit_count", 0) // initial players
100 STORE("deposit_total", 0) // total deposit of all players
110 RETURN 0
End Function
// This function is used to initialize parameters during install time
// Smart contract authors should hardcode their intended address for contract ownership, then add a check within the Initialize() or InitializePrivate() functions to ensure that the caller is the true owner.
Function Initialize() Uint64
10 IF SIGNER() == address_raw("dero1qy4fxqwqrwmsny5uuypwyh5rhhdzglr3ylx77sglhzr5klmyqya36qgvmh5k2") THEN GOTO 30 //Exit unless smart contract owner.
20 RETURN 0 // exit
30 version("1.2.3")
40 STORE("owner", SIGNER()) // store in DB ["owner"] = address
50 STORE("lotteryeveryXdeposit", 2) // lottery will reward every X deposits
// How much will lottery giveback in 1/10000 parts, granularity .01 %
60 STORE("lotterygiveback", 9900) // lottery will give reward 99% of deposits, 1 % is accumulated for owner to withdraw
70 STORE("deposit_count", 0) // initial players
80 STORE("deposit_total", 0) // total deposit of all players
90 RETURN 0
End Function
// Function to tune lottery parameters
Function TuneLotteryParameters(input Uint64, lotteryeveryXdeposit Uint64, lotterygiveback Uint64) Uint64
10 dim key,stored_owner as String
20 dim value_uint64 as Uint64
30 IF LOAD("owner") == SIGNER() THEN GOTO 100 // check whether owner is real owner
40 RETURN 1
100 STORE("lotteryeveryXdeposit", lotteryeveryXdeposit) // lottery will reward every X deposits
130 STORE("lotterygiveback", value_uint64) // how much will lottery giveback in 1/10000 parts, granularity .01 %
140 RETURN 0 // return success
End Function
// This function is used to change owner
// owner is an string form of address
Function TransferOwnership(newowner String) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 STORE("tmpowner",ADDRESS_RAW(newowner))
40 RETURN 0
End Function
// Until the new owner claims ownership, existing owner remains owner
Function ClaimOwnership() Uint64
10 IF LOAD("tmpowner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 STORE("owner",SIGNER()) // ownership claim successful
40 RETURN 0
End Function
// If signer is owner, withdraw any requested funds
// If everthing is okay, they will be showing in signers wallet
Function Withdraw( amount Uint64) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 SEND_DERO_TO_ADDRESS(SIGNER(),amount)
40 RETURN 0
End Function
// If signer is owner, provide him rights to update code anytime
// make sure update is always available to SC
Function UpdateCode( code String) Uint64
10 IF LOAD("owner") == SIGNER() THEN GOTO 30
20 RETURN 1
30 UPDATE_SC_CODE(code)
40 RETURN 0
End Function'] |
