{ "contractName": "ReentrancyGuard", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.6.11+commit.5ef660b1\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"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. TIP: If you would like to learn more about reentrancy and alternative ways to protect against it, check out our blog post https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\",\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol\":\"ReentrancyGuard\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xcab30f879b71ad33a1dc40bf1f0a388dad63e057901d09f6f25ab5afc36f4e07\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://68b685f000752cf4553b155bc6a55006b03d981f300fd7d23ebc8a67dd8ba424\",\"dweb:/ipfs/QmWudHPsmKS2o4PRdnVgc7qsgD1xwyBgnkUZKiJRq15VVn\"]}},\"version\":1}", "bytecode": "0x", "deployedBytecode": "0x", "immutableReferences": {}, "sourceMap": "", "deployedSourceMap": "", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.6.0;\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 bool private _notEntered;\n\n constructor () internal {\n // Storing an initial non-zero value makes deployment a bit more\n // expensive, but in exchange the refund on every call to nonReentrant\n // will be lower in amount. Since refunds are capped to a percetange of\n // the total transaction's gas, it is best to keep them low in cases\n // like this one, to increase the likelihood of the full refund coming\n // into effect.\n _notEntered = true;\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(_notEntered, \"ReentrancyGuard: reentrant call\");\n\n // Any calls to nonReentrant after this point will fail\n _notEntered = false;\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 _notEntered = true;\n }\n}\n", "sourcePath": "openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol", "ast": { "absolutePath": "openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol", "exportedSymbols": { "ReentrancyGuard": [ 39591 ] }, "id": 39592, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 39561, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:123" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 39562, "nodeType": "StructuredDocumentation", "src": "58:750:123", "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": 39591, "linearizedBaseContracts": [ 39591 ], "name": "ReentrancyGuard", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "id": 39564, "mutability": "mutable", "name": "_notEntered", "nodeType": "VariableDeclaration", "overrides": null, "scope": 39591, "src": "840:24:123", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 39563, "name": "bool", "nodeType": "ElementaryTypeName", "src": "840:4:123", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": 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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": 39590, "name": "nonReentrant", "nodeType": "ModifierDefinition", "overrides": null, "parameters": { "id": 39574, "nodeType": "ParameterList", "parameters": [], "src": "1738:2:123" }, "src": "1717:434:123", "virtual": false, "visibility": "internal" } ], "scope": 39592, "src": "809:1344:123" } ], "src": "33:2121:123" }, "legacyAST": { "absolutePath": "openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol", "exportedSymbols": { "ReentrancyGuard": [ 39591 ] }, "id": 39592, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 39561, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:123" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 39562, "nodeType": "StructuredDocumentation", "src": "58:750:123", "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. 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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. TIP: If you would like to learn more about reentrancy and alternative ways to protect against it, check out our blog post https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].", "kind": "dev", "methods": {}, "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }