{ "contractName": "MajorityOracle", "abi": [ { "constant": true, "inputs": [ { "name": "", "type": "uint256" } ], "name": "oracles", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "masterCopy", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getStatusAndOutcome", "outputs": [ { "name": "outcomeSet", "type": "bool" }, { "name": "outcome", "type": "int256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "isOutcomeSet", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getOutcome", "outputs": [ { "name": "", "type": "int256" } ], "payable": false, "stateMutability": "view", "type": "function" } ], 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"source": "pragma solidity ^0.5.0;\nimport \"../Oracles/Oracle.sol\";\nimport \"@gnosis.pm/util-contracts/contracts/Proxy.sol\";\n\n\ncontract MajorityOracleData {\n\n /*\n * Storage\n */\n Oracle[] public oracles;\n}\n\ncontract MajorityOracleProxy is Proxy, MajorityOracleData {\n\n /// @dev Allows to create an oracle for a majority vote based on other oracles\n /// @param _oracles List of oracles taking part in the majority vote\n constructor(address proxied, Oracle[] memory _oracles)\n Proxy(proxied)\n public\n {\n // At least 2 oracles should be defined\n require(_oracles.length > 2);\n for (uint i = 0; i < _oracles.length; i++)\n // Oracle address cannot be null\n require(address(_oracles[i]) != address(0));\n oracles = _oracles;\n }\n}\n\n/// @title Majority oracle contract - Allows to resolve an event based on multiple oracles with majority vote\n/// @author Stefan George - \ncontract MajorityOracle is Proxied, Oracle, MajorityOracleData {\n\n /*\n * Public functions\n */\n /// @dev Allows to registers oracles for a majority vote\n /// @return Is outcome set?\n /// @return Outcome\n function getStatusAndOutcome()\n public\n view\n returns (bool outcomeSet, int outcome)\n {\n uint i;\n int[] memory outcomes = new int[](oracles.length);\n uint[] memory validations = new uint[](oracles.length);\n for (i = 0; i < oracles.length; i++)\n if (oracles[i].isOutcomeSet()) {\n int _outcome = oracles[i].getOutcome();\n for (uint j = 0; j <= i; j++)\n if (_outcome == outcomes[j]) {\n validations[j] += 1;\n break;\n }\n else if (validations[j] == 0) {\n outcomes[j] = _outcome;\n validations[j] = 1;\n break;\n }\n }\n uint outcomeValidations = 0;\n uint outcomeIndex = 0;\n for (i = 0; i < oracles.length; i++)\n if (validations[i] > outcomeValidations) {\n outcomeValidations = validations[i];\n outcomeIndex = i;\n }\n // There is a majority vote\n if (outcomeValidations * 2 > oracles.length) {\n outcomeSet = true;\n outcome = outcomes[outcomeIndex];\n }\n }\n\n /// @dev Returns if winning outcome is set\n /// @return Is outcome set?\n function isOutcomeSet()\n public\n view\n returns (bool)\n {\n (bool outcomeSet, ) = getStatusAndOutcome();\n return outcomeSet;\n }\n\n /// @dev Returns winning outcome\n /// @return Outcome\n function getOutcome()\n public\n view\n returns (int)\n {\n (, int winningOutcome) = getStatusAndOutcome();\n return winningOutcome;\n }\n}\n", "sourcePath": "/home/alan/src/github.com/gnosis/pm-contracts/contracts/Oracles/MajorityOracle.sol", "ast": { "absolutePath": "/home/alan/src/github.com/gnosis/pm-contracts/contracts/Oracles/MajorityOracle.sol", "exportedSymbols": { "MajorityOracle": [ 4772 ], "MajorityOracleData": [ 4527 ], "MajorityOracleProxy": [ 4579 ] }, "id": 4773, "nodeType": "SourceUnit", "nodes": [ { "id": 4521, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:20" }, { "absolutePath": "/home/alan/src/github.com/gnosis/pm-contracts/contracts/Oracles/Oracle.sol", "file": 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"t_uint256", "typeString": "uint256" }, "id": 4704, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 4701, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4593, "src": "2079:1:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 4702, "name": "oracles", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4526, "src": "2083:7:20", "typeDescriptions": { "typeIdentifier": "t_array$_t_contract$_Oracle_$4841_$dyn_storage", "typeString": "contract Oracle[] storage ref" } }, "id": 4703, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2083:14:20", 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"src": "2072:5:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 4700, "nodeType": "ExpressionStatement", "src": "2072:5:20" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 4706, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "2099:3:20", "subExpression": { "argumentTypes": null, "id": 4705, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4593, "src": "2099:1:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 4707, "nodeType": "ExpressionStatement", "src": "2099:3:20" }, "nodeType": "ForStatement", "src": "2067:192:20" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 4731, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 4728, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 4726, "name": "outcomeValidations", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4690, "src": "2308:18:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "hexValue": "32", "id": 4727, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2329:1:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2_by_1", "typeString": "int_const 2" }, "value": "2" }, "src": "2308:22:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 4729, "name": "oracles", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4526, "src": "2333:7:20", "typeDescriptions": { "typeIdentifier": "t_array$_t_contract$_Oracle_$4841_$dyn_storage", "typeString": "contract Oracle[] storage ref" } }, "id": 4730, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2333:14:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2308:39:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 4743, "nodeType": "IfStatement", "src": "2304:133:20", "trueBody": { "id": 4742, "nodeType": "Block", "src": "2349:88:20", "statements": [ { "expression": { "argumentTypes": null, "id": 4734, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 4732, "name": "outcomeSet", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4588, "src": "2363:10:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "hexValue": "74727565", "id": 4733, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "2376:4:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "src": "2363:17:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4735, "nodeType": "ExpressionStatement", "src": "2363:17:20" }, { "expression": { "argumentTypes": null, "id": 4740, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 4736, "name": "outcome", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4590, "src": "2394:7:20", "typeDescriptions": { "typeIdentifier": "t_int256", "typeString": "int256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4737, "name": "outcomes", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4598, "src": "2404:8:20", "typeDescriptions": { "typeIdentifier": "t_array$_t_int256_$dyn_memory_ptr", "typeString": "int256[] memory" } }, "id": 4739, "indexExpression": { "argumentTypes": null, "id": 4738, "name": "outcomeIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4694, "src": "2413:12:20", "typeDescriptions": { "typeIdentifier": 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