Gnosis compilation contracts.

2023-10-03 13:03:40 +00:00 · 2017-07-12 15:55:11 +02:00
parent 91f17a3662
commit b1c1fb6c83
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+pragma solidity ^0.4.11;
+import "../Oracles/Oracle.sol";
+
+
+/// @title Centralized oracle contract - Allows the contract owner to set an outcome
+/// @author Stefan George - <stefan@gnosis.pm>
+contract CentralizedOracle is Oracle {
+
+    /*
+     *  Events
+     */
+    event OwnerReplacement(address indexed newOwner);
+    event OutcomeAssignment(int outcome);
+
+    /*
+     *  Storage
+     */
+    address public owner;
+    bytes public ipfsHash;
+    bool public isSet;
+    int public outcome;
+
+    /*
+     *  Modifiers
+     */
+    modifier isOwner () {
+        // Only owner is allowed to proceed
+        require(msg.sender == owner);
+        _;
+    }
+
+    /*
+     *  Public functions
+     */
+    /// @dev Constructor sets owner address and IPFS hash
+    /// @param _ipfsHash Hash identifying off chain event description
+    function CentralizedOracle(address _owner, bytes _ipfsHash)
+        public
+    {
+        // Description hash cannot be null
+        require(_ipfsHash.length == 46);
+        owner = _owner;
+        ipfsHash = _ipfsHash;
+    }
+
+    /// @dev Replaces owner
+    /// @param newOwner New owner
+    function replaceOwner(address newOwner)
+        public
+        isOwner
+    {
+        // Result is not set yet
+        require(!isSet);
+        owner = newOwner;
+        OwnerReplacement(newOwner);
+    }
+
+    /// @dev Sets event outcome
+    /// @param _outcome Event outcome
+    function setOutcome(int _outcome)
+        public
+        isOwner
+    {
+        // Result is not set yet
+        require(!isSet);
+        isSet = true;
+        outcome = _outcome;
+        OutcomeAssignment(_outcome);
+    }
+
+    /// @dev Returns if winning outcome is set
+    /// @return Is outcome set?
+    function isOutcomeSet()
+        public
+        constant
+        returns (bool)
+    {
+        return isSet;
+    }
+
+    /// @dev Returns outcome
+    /// @return Outcome
+    function getOutcome()
+        public
+        constant
+        returns (int)
+    {
+        return outcome;
+    }
+}