Create lottery contract

dexon-foundation · Apr 7, 2019 · 439d71e · 439d71e
1 parent 8e3c854
commit 439d71e
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Showing 15 changed files with 2,542 additions and 4,095 deletions.
diff --git a/contracts/DonationDXN.sol b/contracts/DonationDXN.sol
diff --git a/contracts/Election.sol b/contracts/Election.sol
diff --git a/contracts/ElectionPractice.sol b/contracts/ElectionPractice.sol
diff --git a/contracts/Lottery.sol b/contracts/Lottery.sol
@@ -0,0 +1,30 @@
+pragma solidity ^0.5.2;
+
+import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
+
+contract Lottery is Ownable {
+    mapping (uint256 => uint256) public numberOfTime;
+    uint256[] public revealedTimes;
+    uint256 public revealedTimesCount = 0;
+    uint256 public lastRevealedTime;
+
+    event NumberRevealed(uint256 indexed timestamp, uint256 number, uint256 rawValue);
+
+    function reveal(uint256 timestamp) public onlyOwner {
+        // check if timestamp is in the future
+        // or if number of timestamp is already revealed
+        if (timestamp > now || numberOfTime[timestamp] != 0) {
+            revert();
+        }
+
+        uint256 rawValue = rand;
+        uint256 number = rawValue % 1000;
+
+        numberOfTime[timestamp] = number;
+        revealedTimes.push(timestamp);
+        revealedTimesCount++;
+        lastRevealedTime = timestamp;
+
+        emit NumberRevealed(timestamp, number, rawValue);
+    }
+}
diff --git a/contracts/Migrations.sol b/contracts/Migrations.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.0;
+pragma solidity ^0.5.2;
 
 contract Migrations {
   address public owner;

diff --git a/contracts/Security.sol b/contracts/Security.sol