{ "contractName": "ReentrancyGuard", "abi": [ { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" } ], "metadata": "{\"compiler\":{\"version\":\"0.5.16+commit.9c3226ce\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"}],\"devdoc\":{\"details\":\"Contract module that helps prevent reentrant calls to a function. * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier available, which can be applied to functions to make sure there are no nested (reentrant) calls to them. * Note that because there is a single `nonReentrant` guard, functions marked as `nonReentrant` may not call one another. This can be worked around by making those functions `private`, and then adding `external` `nonReentrant` entry points to them.\",\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":\"ReentrancyGuard\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xe86fdc15fbc379ecf14d6aa4f51b87c0be8476e114e23c171b790a6717230655\",\"urls\":[\"bzz-raw://81905037f66d37ed211a4e3430af74f36e18b3a5d5b688e6d7d5ee199824a41a\",\"dweb:/ipfs/QmTcpgNKqLVRbcgNSUHazAbVf2bz5uh5mPkAijGeYW7Sqb\"]}},\"version\":1}", "bytecode": "0x", "deployedBytecode": "0x", "sourceMap": "", "deployedSourceMap": "", "source": "pragma solidity ^0.5.0;\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 */\ncontract ReentrancyGuard {\n // counter to allow mutex lock with only one SSTORE operation\n uint256 private _guardCounter;\n\n constructor () internal {\n // The counter starts at one to prevent changing it from zero to a non-zero\n // value, which is a more expensive operation.\n _guardCounter = 1;\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 _guardCounter += 1;\n uint256 localCounter = _guardCounter;\n _;\n require(localCounter == _guardCounter, \"ReentrancyGuard: reentrant call\");\n }\n}\n", "sourcePath": "@openzeppelin/contracts/utils/ReentrancyGuard.sol", "ast": { "absolutePath": "@openzeppelin/contracts/utils/ReentrancyGuard.sol", "exportedSymbols": { "ReentrancyGuard": [ 3581 ] }, "id": 3582, "nodeType": "SourceUnit", "nodes": [ { "id": 3551, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:22" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": "@dev Contract module that helps prevent reentrant calls to a function.\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\navailable, 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. 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It is possible to prevent this from happening\nby making the `nonReentrant` function external, and make it call a\n`private` function that does the actual work.", "id": 3580, "name": "nonReentrant", "nodeType": "ModifierDefinition", "parameters": { "id": 3562, "nodeType": "ParameterList", "parameters": [], "src": "1283:2:22" }, "src": "1262:199:22", "visibility": "internal" } ], "scope": 3582, "src": "557:906:22" } ], "src": "0:1464:22" }, "legacyAST": { "absolutePath": "@openzeppelin/contracts/utils/ReentrancyGuard.sol", "exportedSymbols": { "ReentrancyGuard": [ 3581 ] }, "id": 3582, "nodeType": "SourceUnit", "nodes": [ { "id": 3551, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:22" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": "@dev Contract module that helps prevent reentrant calls to a function.\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\navailable, 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\nthose functions `private`, and then adding `external` `nonReentrant` entry\npoints to them.", "fullyImplemented": true, "id": 3581, "linearizedBaseContracts": [ 3581 ], "name": "ReentrancyGuard", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "id": 3553, "name": "_guardCounter", "nodeType": "VariableDeclaration", "scope": 3581, "src": "654:29:22", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3552, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "654:7:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "private" }, { "body": { "id": 3560, "nodeType": "Block", "src": "714:173:22", "statements": [ { "expression": { "argumentTypes": null, "id": 3558, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { 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It is possible to prevent this from happening\nby making the `nonReentrant` function external, and make it call a\n`private` function that does the actual work.", "id": 3580, "name": "nonReentrant", "nodeType": "ModifierDefinition", "parameters": { "id": 3562, "nodeType": "ParameterList", "parameters": [], "src": "1283:2:22" }, "src": "1262:199:22", "visibility": "internal" } ], "scope": 3582, "src": "557:906:22" } ], "src": "0:1464:22" }, "compiler": { "name": "solc", "version": "0.5.16+commit.9c3226ce.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.0.20", "updatedAt": "2020-02-01T23:51:00.359Z", "devdoc": { "details": "Contract module that helps prevent reentrant calls to a function. * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier available, which can be applied to functions to make sure there are no nested (reentrant) calls to them. * Note that because there is a single `nonReentrant` guard, functions marked as `nonReentrant` may not call one another. This can be worked around by making those functions `private`, and then adding `external` `nonReentrant` entry points to them.", "methods": {} }, "userdoc": { "methods": {} } }