Lottery Smart Contract Guide

curl --request POST --data-binary @lottery.bas http://127.0.0.1:40403/install_sc

curl http://127.0.0.1:40402/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"getsc","params":{"scid":"30b84e9ab5baeee7195e7e1ccb1f533b7402beb2d3cfa97216a6d80c01056f66", "code":true}}' -H 'Content-Type: application/json'
 
curl http://127.0.0.1:40402/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"getsc","params":{"scid":"30b84e9ab5baeee7195e7e1ccb1f533b7402beb2d3cfa97216a6d80c01056f66", "code":false, "keysstring":["deposit_count"]}}' -H 'Content-Type: application/json'

curl http://127.0.0.1:40403/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"scinvoke","params":{"sc_dero_deposit":200000,"scid":"30b84e9ab5baeee7195e7e1ccb1f533b7402beb2d3cfa97216a6d80c01056f66","sc_rpc":[{"name":"entrypoint","datatype":"S","value":"Lottery"}]}}' -H 'Content-Type: application/json'

curl http://127.0.0.1:40403/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"scinvoke","params":{"scid":"30b84e9ab5baeee7195e7e1ccb1f533b7402beb2d3cfa97216a6d80c01056f66","sc_rpc":[{"name":"entrypoint","datatype":"S","value":"Withdraw"},{"name":"amount","datatype":"U","value":100000}]}}' -H 'Content-Type: application/json'

curl http://127.0.0.1:40403/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"scinvoke","params":{"scid":"30b84e9ab5baeee7195e7e1ccb1f533b7402beb2d3cfa97216a6d80c01056f66","sc_rpc":[{"name":"entrypoint","datatype":"S","value":"TransferOwnership"},{"name":"newowner","datatype":"S","value":"detoAddressForOwnershipReceiver"}]}}' -H 'Content-Type: application/json'

curl http://127.0.0.1:40403/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"scinvoke","params":{"scid":"YourSCID","sc_rpc":[{"name":"entrypoint","datatype":"S","value":"ClaimOwnership"}]}}' -H 'Content-Type: application/json'

curl http://127.0.0.1:40403/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"scinvoke","params":{"scid":"YourSCID","sc_rpc":[{"name":"entrypoint","datatype":"S","value":"UpdateCode"},{"name":"code","datatype":"S","value":"new code should be
 
 placed here"}]}}' -H 'Content-Type: application/json'

/* Lottery Smart Contract in DVM-BASIC
This lottery smart contract will give lottery wins every xth try. */

Function Lottery(value Uint64) Uint64
    10 dim deposit_count,winner as Uint64
    20 LET deposit_count =  LOAD("deposit_count")+1
    25 IF value == 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") + value )
    50 STORE("deposit_count", deposit_count)
    60 IF LOAD("lotteryeveryXdeposit") > deposit_count THEN GOTO 110 // wait till X players join in
    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)

    // Reinitialize 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

// Function used to initialize parameters during install time
Function Initialize() Uint64
    10 STORE("owner", SIGNER())  // store in DB ["owner"] = address
    20 STORE("lotteryeveryXdeposit", 2)  // lottery rewards every X deposits
    30 STORE("lotterygiveback", 9900)  // lottery gives back 99% of deposits, 1% accumulated for owner to withdraw
    33 STORE("deposit_count", 0)  // initial players
    34 STORE("deposit_total", 0)  // total deposit of all players
    // 35 printf "Initialize executed"
    40 RETURN 0 
End Function

// Used 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 rewards every X deposits
    130 STORE("lotterygiveback", value_uint64)  // lottery gives back in 1/10000 parts, granularity .01%
    140 RETURN 0 // return success
End Function

// Function used to change owner, owner is a 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, the existing owner remains the 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 the owner, withdraw any requested funds
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 the owner, provide rights to update code anytime
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