{ "fileName": "ReentrancyGuard.sol", "contractName": "ReentrancyGuard", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\ncontract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant _NOT_ENTERED = 1;\n uint256 private constant _ENTERED = 2;\n\n uint256 private _status;\n\n constructor () {\n _status = _NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and make it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n // On the first call to nonReentrant, _notEntered will be true\n require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n // Any calls to nonReentrant after this point will fail\n _status = _ENTERED;\n\n _;\n\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = _NOT_ENTERED;\n }\n}\n", "sourcePath": "contracts/utils/ReentrancyGuard.sol", "sourceMap": "809:1776:111:-:0;;;1709:54;;;;;;;;;;1628:1;1734:7;:22;;;;809:1776;;;;;;", "deployedSourceMap": "809:1776:111:-:0;;;;;", "abi": [ { "inputs": [], "stateMutability": "nonpayable", "type": "constructor" } ], "ast": { "absolutePath": "contracts/utils/ReentrancyGuard.sol", "exportedSymbols": { "ReentrancyGuard": [ 14034 ] }, "id": 14035, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 13996, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:111" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 13997, "nodeType": "StructuredDocumentation", "src": "58:750:111", "text": " @dev Contract module that helps prevent reentrant calls to a function.\n Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n available, which can be applied to functions to make sure there are no nested\n (reentrant) calls to them.\n Note that because there is a single `nonReentrant` guard, functions marked as\n `nonReentrant` may not call one another. This can be worked around by making\n those functions `private`, and then adding `external` `nonReentrant` entry\n points to them.\n TIP: If you would like to learn more about reentrancy and alternative ways\n to protect against it, check out our blog post\n https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]." }, "fullyImplemented": true, "id": 14034, "linearizedBaseContracts": [ 14034 ], "name": "ReentrancyGuard", "nodeType": "ContractDefinition", "nodes": [ { "constant": true, "id": 14000, "mutability": "constant", "name": "_NOT_ENTERED", "nodeType": "VariableDeclaration", "overrides": null, "scope": 14034, "src": "1588:41:111", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 13998, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1588:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "hexValue": "31", "id": 13999, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1628:1:111", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "visibility": "private" }, { "constant": true, "id": 14003, "mutability": "constant", "name": "_ENTERED", "nodeType": "VariableDeclaration", "overrides": null, "scope": 14034, "src": "1635:37:111", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 14001, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1635:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "hexValue": "32", "id": 14002, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1671:1:111", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2_by_1", "typeString": "int_const 2" }, "value": "2" }, "visibility": "private" }, { "constant": false, "id": 14005, "mutability": "mutable", "name": "_status", "nodeType": "VariableDeclaration", "overrides": null, "scope": 14034, "src": "1679:23:111", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 14004, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1679:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "private" }, { "body": { "id": 14012, "nodeType": "Block", "src": "1724:39:111", "statements": [ { "expression": { "argumentTypes": null, "id": 14010, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 14008, "name": "_status", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14005, "src": "1734:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 14009, "name": "_NOT_ENTERED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14000, "src": "1744:12:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "1734:22:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 14011, "nodeType": "ExpressionStatement", "src": "1734:22:111" } ] }, "documentation": null, "id": 14013, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 14006, "nodeType": "ParameterList", "parameters": [], "src": "1721:2:111" }, "returnParameters": { "id": 14007, "nodeType": "ParameterList", "parameters": [], "src": "1724:0:111" }, "scope": 14034, "src": "1709:54:111", "stateMutability": "nonpayable", "virtual": false, "visibility": "public" }, { "body": { "id": 14032, "nodeType": "Block", "src": "2162:421:111", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 14019, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 14017, "name": "_status", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14005, "src": "2251:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 14018, "name": "_ENTERED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14003, "src": "2262:8:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2251:19:111", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "5265656e7472616e637947756172643a207265656e7472616e742063616c6c", "id": 14020, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "2272:33:111", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_ebf73bba305590e4764d5cb53b69bffd6d4d092d1a67551cb346f8cfcdab8619", "typeString": "literal_string \"ReentrancyGuard: reentrant call\"" }, "value": "ReentrancyGuard: reentrant call" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_ebf73bba305590e4764d5cb53b69bffd6d4d092d1a67551cb346f8cfcdab8619", "typeString": "literal_string \"ReentrancyGuard: reentrant call\"" } ], "id": 14016, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "2243:7:111", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 14021, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2243:63:111", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 14022, "nodeType": "ExpressionStatement", "src": "2243:63:111" }, { "expression": { "argumentTypes": null, "id": 14025, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 14023, "name": "_status", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14005, "src": "2381:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 14024, "name": "_ENTERED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14003, "src": "2391:8:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2381:18:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 14026, "nodeType": "ExpressionStatement", "src": "2381:18:111" }, { "id": 14027, "nodeType": "PlaceholderStatement", "src": "2410:1:111" }, { "expression": { "argumentTypes": null, "id": 14030, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 14028, "name": "_status", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14005, "src": "2554:7:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 14029, "name": "_NOT_ENTERED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 14000, "src": "2564:12:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2554:22:111", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 14031, "nodeType": "ExpressionStatement", "src": "2554:22:111" } ] }, "documentation": { "id": 14014, "nodeType": "StructuredDocumentation", "src": "1769:364:111", "text": " @dev Prevents a contract from calling itself, directly or indirectly.\n Calling a `nonReentrant` function from another `nonReentrant`\n function is not supported. It is possible to prevent this from happening\n by making the `nonReentrant` function external, and make it call a\n `private` function that does the actual work." }, "id": 14033, "name": "nonReentrant", "nodeType": "ModifierDefinition", "overrides": null, "parameters": { "id": 14015, "nodeType": "ParameterList", "parameters": [], "src": "2159:2:111" }, "src": "2138:445:111", "virtual": false, "visibility": "internal" } ], "scope": 14035, "src": "809:1776:111" } ], "src": "33:2553:111" }, "bytecode": "0x6080604052348015600f57600080fd5b506001600081905550603f8060256000396000f3fe6080604052600080fdfea264697066735822122096e87e2291095cfe874bcea78734a0de2dc6058923ff5556d7cdfa7a3614f86464736f6c63430007000033", "deployedBytecode": "0x6080604052600080fdfea264697066735822122096e87e2291095cfe874bcea78734a0de2dc6058923ff5556d7cdfa7a3614f86464736f6c63430007000033", "compiler": { "name": "solc", "version": "0.7.0+commit.9e61f92b.Emscripten.clang", "optimizer": { "enabled": false, "runs": 200 }, "evmVersion": "petersburg" } }