I don’t like to promote gambling, but here is the source code for your perusal.
From Ethereum based slot machine.
Website http://www.etherslots.win/.
Verified source code below from the contract address 0x76bc9e61a1904b82cbf70d1fd9c0f8a120483bbb (with current balance 55.708317757 Ether USD 610.56) :
/
/*
Copyright (c) 2015-2016 Oraclize srl, Thomas Bertani
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
pragma solidity ^0.4.0;
contract OraclizeI {
address public cbAddress;
function query(uint _timestamp, string _datasource, string _arg) payable returns (bytes32 _id);
function query_withGasLimit(uint _timestamp, string _datasource, string _arg, uint _gaslimit) payable returns (bytes32 _id);
function query2(uint _timestamp, string _datasource, string _arg1, string _arg2) payable returns (bytes32 _id);
function query2_withGasLimit(uint _timestamp, string _datasource, string _arg1, string _arg2, uint _gaslimit) payable returns (bytes32 _id);
function getPrice(string _datasource) returns (uint _dsprice);
function getPrice(string _datasource, uint gaslimit) returns (uint _dsprice);
function useCoupon(string _coupon);
function setProofType(byte _proofType);
function setCustomGasPrice(uint _gasPrice);
}
contract OraclizeAddrResolverI {
function getAddress() returns (address _addr);
}
contract usingOraclize {
uint constant day = 60*60*24;
uint constant week = 60*60*24*7;
uint constant month = 60*60*24*30;
byte constant proofType_NONE = 0x00;
byte constant proofType_TLSNotary = 0x10;
byte constant proofStorage_IPFS = 0x01;
uint8 constant networkID_auto = 0;
uint8 constant networkID_mainnet = 1;
uint8 constant networkID_testnet = 2;
uint8 constant networkID_morden = 2;
uint8 constant networkID_consensys = 161;
OraclizeAddrResolverI OAR;
OraclizeI oraclize;
modifier oraclizeAPI {
if(address(OAR)==0) oraclize_setNetwork(networkID_auto);
oraclize = OraclizeI(OAR.getAddress());
_;
}
modifier coupon(string code){
oraclize = OraclizeI(OAR.getAddress());
oraclize.useCoupon(code);
_;
}
function oraclize_setNetwork(uint8 networkID) internal returns(bool){
if (getCodeSize(0x1d3b2638a7cc9f2cb3d298a3da7a90b67e5506ed)>0){
OAR = OraclizeAddrResolverI(0x1d3b2638a7cc9f2cb3d298a3da7a90b67e5506ed);
return true;
}
if (getCodeSize(0x9efbea6358bed926b293d2ce63a730d6d98d43dd)>0){
OAR = OraclizeAddrResolverI(0x9efbea6358bed926b293d2ce63a730d6d98d43dd);
return true;
}
if (getCodeSize(0x20e12a1f859b3feae5fb2a0a32c18f5a65555bbf)>0){
OAR = OraclizeAddrResolverI(0x20e12a1f859b3feae5fb2a0a32c18f5a65555bbf);
return true;
}
if (getCodeSize(0x9a1d6e5c6c8d081ac45c6af98b74a42442afba60)>0){
OAR = OraclizeAddrResolverI(0x9a1d6e5c6c8d081ac45c6af98b74a42442afba60);
return true;
}
return false;
}
function oraclize_query(string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource);
if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
return oraclize.query.value(price)(0, datasource, arg);
}
function oraclize_query(uint timestamp, string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource);
if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
return oraclize.query.value(price)(timestamp, datasource, arg);
}
function oraclize_query(uint timestamp, string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource, gaslimit);
if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
return oraclize.query_withGasLimit.value(price)(timestamp, datasource, arg, gaslimit);
}
function oraclize_query(string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource, gaslimit);
if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
return oraclize.query_withGasLimit.value(price)(0, datasource, arg, gaslimit);
}
function oraclize_query(string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource);
if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
return oraclize.query2.value(price)(0, datasource, arg1, arg2);
}
function oraclize_query(uint timestamp, string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource);
if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
return oraclize.query2.value(price)(timestamp, datasource, arg1, arg2);
}
function oraclize_query(uint timestamp, string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource, gaslimit);
if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
return oraclize.query2_withGasLimit.value(price)(timestamp, datasource, arg1, arg2, gaslimit);
}
function oraclize_query(string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
uint price = oraclize.getPrice(datasource, gaslimit);
if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
return oraclize.query2_withGasLimit.value(price)(0, datasource, arg1, arg2, gaslimit);
}
function oraclize_cbAddress() oraclizeAPI internal returns (address){
return oraclize.cbAddress();
}
function oraclize_setProof(byte proofP) oraclizeAPI internal {
return oraclize.setProofType(proofP);
}
function oraclize_setCustomGasPrice(uint gasPrice) oraclizeAPI internal {
return oraclize.setCustomGasPrice(gasPrice);
}
function getCodeSize(address _addr) constant internal returns(uint _size) {
assembly {
_size := extcodesize(_addr)
}
}
function parseAddr(string _a) internal returns (address){
bytes memory tmp = bytes(_a);
uint160 iaddr = 0;
uint160 b1;
uint160 b2;
for (uint i=2; i<2+2*20; i+=2){ iaddr *= 256; b1 = uint160(tmp[i]); b2 = uint160(tmp[i+1]); if ((b1 >= 97)&&(b1 <= 102)) b1 -= 87; else if ((b1 >= 48)&&(b1 <= 57)) b1 -= 48; if ((b2 >= 97)&&(b2 <= 102)) b2 -= 87; else if ((b2 >= 48)&&(b2 <= 57)) b2 -= 48;
iaddr += (b1*16+b2);
}
return address(iaddr);
}
function strCompare(string _a, string _b) internal returns (int) {
bytes memory a = bytes(_a);
bytes memory b = bytes(_b);
uint minLength = a.length;
if (b.length < minLength) minLength = b.length;
for (uint i = 0; i < minLength; i ++)
if (a[i] < b[i]) return -1; else if (a[i] > b[i])
return 1;
if (a.length < b.length) return -1; else if (a.length > b.length)
return 1;
else
return 0;
}
function indexOf(string _haystack, string _needle) internal returns (int)
{
bytes memory h = bytes(_haystack);
bytes memory n = bytes(_needle);
if(h.length < 1 || n.length < 1 || (n.length > h.length))
return -1;
else if(h.length > (2**128 -1))
return -1;
else
{
uint subindex = 0;
for (uint i = 0; i < h.length; i ++)
{
if (h[i] == n[0])
{
subindex = 1;
while(subindex < n.length && (i + subindex) < h.length && h[i + subindex] == n[subindex])
{
subindex++;
}
if(subindex == n.length)
return int(i);
}
}
return -1;
}
}
function strConcat(string _a, string _b, string _c, string _d, string _e) internal returns (string){
bytes memory _ba = bytes(_a);
bytes memory _bb = bytes(_b);
bytes memory _bc = bytes(_c);
bytes memory _bd = bytes(_d);
bytes memory _be = bytes(_e);
string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
bytes memory babcde = bytes(abcde);
uint k = 0;
for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
for (i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
for (i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
for (i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
for (i = 0; i < _be.length; i++) babcde[k++] = _be[i];
return string(babcde);
}
function strConcat(string _a, string _b, string _c, string _d) internal returns (string) {
return strConcat(_a, _b, _c, _d, "");
}
function strConcat(string _a, string _b, string _c) internal returns (string) {
return strConcat(_a, _b, _c, "", "");
}
function strConcat(string _a, string _b) internal returns (string) {
return strConcat(_a, _b, "", "", "");
}
// parseInt
function parseInt(string _a) internal returns (uint) {
return parseInt(_a, 0);
}
// parseInt(parseFloat*10^_b)
function parseInt(string _a, uint _b) internal returns (uint) {
bytes memory bresult = bytes(_a);
uint mint = 0;
bool decimals = false;
for (uint i=0; i<bresult.length; i++){ if ((bresult[i] >= 48)&&(bresult[i] <= 57)){ if (decimals){ if (_b == 0) break; else _b--; } mint *= 10; mint += uint(bresult[i]) - 48; } else if (bresult[i] == 46) decimals = true; } if (_b > 0) mint *= 10**_b;
return mint;
}
}
//
contract mortal {
address owner;
function mortal() {
owner = msg.sender;
}
function kill() {
if (msg.sender == owner) suicide(owner);
}
}
contract slot is mortal, usingOraclize {
/** which oraclize ID belong to which player address?**/
mapping (bytes32 => address) players;
/** the amount of gas to be sent to oraclize**/
uint32 public oraclizeGas;
/** probabilities of the different results (absolute frequency out of 1.000.000 spins)**/
uint32[] public probabilities;
/** the prize per probability (shifted by two digits -> 375 is acutually 3.75)*/
uint32[] public prizes;
/** the amount of ether per bet **/
mapping (bytes32 => uint) bets;
/** tell the listeners the result
first value: type, second value: player address, third value: oraclize ID**/
event gameResult(uint, address);// 0-> %5; 1 -> 80%; 2 -> loss, 3->error in callback;
/** **/
function slot() payable{
probabilities.push(4);
probabilities.push(50);
probabilities.push(200);
probabilities.push(600);
probabilities.push(1000);
probabilities.push(2000);
probabilities.push(4000);
probabilities.push(30000);
probabilities.push(90000);
prizes.push(5000);
prizes.push(2500);
prizes.push(2000);
prizes.push(1900);
prizes.push(1800);
prizes.push(1700);
prizes.push(1600);
prizes.push(1500);
prizes.push(375);
oraclizeGas = 100000;
}
/**
* If more than 0.1 ether and less than 1 ether is sent and the contracts holds enough to pay out the player in case of a win, a random number is asked from oraclize.
* */
function() payable {
if(msg.sender!=owner){//owner should be able to send funds to the contract anytime
if(msg.value<100000000000000000||msg.value>1000000000000000000) throw;//bet has to lie between 0.1 and 1 ETH
if(address(this).balance < msg.value/100*prizes[0]) throw; //make sure the contract is able to pay out the player in case he wins
bytes32 oid = oraclize_query("URL","https://www.random.org/integers/?num=1&min=1&max=1000000&col=1&base=10&format=plain&rnd=new", oraclizeGas);
bets[oid] = msg.value;
players[oid] = msg.sender;
}
}
/**
* The random number from Oraclizes decides the game result.
* If Oraclize sends a message instead of the requested number, the bet is returned to the player.
* */
function __callback(bytes32 myid, string result) {
if (msg.sender != oraclize_cbAddress()) throw;
if (players[myid]==0x0) throw;
uint random = convertToInt(result);
if(random==0){//result not a number, return bet
if(!players[myid].send(bets[myid])) throw;
gameResult(101,players[myid]);
delete players[myid];
return;
}
uint range = 0;
for(uint i = 0; i<probabilities.length; i++){
range+=probabilities[i];
if(random<=range){ if(!players[myid].send(bets[myid]/100*prizes[i])){ gameResult(100,players[myid]);//100 -> error
throw;
}
gameResult(i, players[myid]);
delete players[myid];
return;
}
}
//else player loses everything
gameResult(probabilities.length, players[myid]);
delete players[myid];
}
/**
* sets the amount of gas to be sent to oraclize
* */
function setOraclizeGas(uint32 newGas){
if(!(msg.sender==owner)) throw;
oraclizeGas = newGas;
}
/** set the probabilities of the results (absolute frequencies out of 1.000.000 spins) **/
function setProbabilities(uint32[] probs){
if(!(msg.sender==owner)) throw;
probabilities=probs;
}
/** set the prizes of the results (shifted by 2 digits -> 375 means 3.75)**/
function setPrizes(uint32[] priz){
if(!(msg.sender==owner)) throw;
prizes=priz;
}
/**
* allows the owner to collect the accumulated losses
* */
function collectFees(uint amount){
if(!(msg.sender==owner)) throw;
if( address(this).balance < amount) throw;
if(!owner.send(amount)) throw;
}
/**
* converts a string to an integer (there may only be digits)
* */
function convertToInt(string _a) internal returns (uint) {
bytes memory bresult = bytes(_a);
uint mint = 0;
for (uint i=0; i<bresult.length; i++){ if ((bresult[i] >= 48)&&(bresult[i] <= 57)){ mint *= 10; mint += uint(bresult[i]) - 48; } else if((bresult[i] >= 58)&&(bresult[i] <= 126)) return 0;//its a message, no pure int
}
return mint;
}
}