{
    "contractName": "RelayHub",
    "abi": [
        {
            "inputs": [
                {
                    "internalType": "contract IStakeManager",
                    "name": "_stakeManager",
                    "type": "address"
                },
                {
                    "internalType": "address",
                    "name": "_penalizer",
                    "type": "address"
                },
                {
                    "internalType": "uint256",
                    "name": "_maxWorkerCount",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_gasReserve",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_postOverhead",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_gasOverhead",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_maximumRecipientDeposit",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_minimumUnstakeDelay",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "_minimumStake",
                    "type": "uint256"
                }
            ],
            "stateMutability": "nonpayable",
            "type": "constructor"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "paymaster",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "from",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "amount",
                    "type": "uint256"
                }
            ],
            "name": "Deposited",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "relayManager",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "baseRelayFee",
                    "type": "uint256"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "pctRelayFee",
                    "type": "uint256"
                },
                {
                    "indexed": false,
                    "internalType": "string",
                    "name": "relayUrl",
                    "type": "string"
                }
            ],
            "name": "RelayServerRegistered",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "relayManager",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "address[]",
                    "name": "newRelayWorkers",
                    "type": "address[]"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "workersCount",
                    "type": "uint256"
                }
            ],
            "name": "RelayWorkersAdded",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "relayManager",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "paymaster",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "from",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "address",
                    "name": "to",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "address",
                    "name": "relayWorker",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "bytes4",
                    "name": "selector",
                    "type": "bytes4"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "innerGasUsed",
                    "type": "uint256"
                },
                {
                    "indexed": false,
                    "internalType": "bytes",
                    "name": "reason",
                    "type": "bytes"
                }
            ],
            "name": "TransactionRejectedByPaymaster",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "relayManager",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "relayWorker",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "from",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "address",
                    "name": "to",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "address",
                    "name": "paymaster",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "bytes4",
                    "name": "selector",
                    "type": "bytes4"
                },
                {
                    "indexed": false,
                    "internalType": "enum IRelayHub.RelayCallStatus",
                    "name": "status",
                    "type": "uint8"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "charge",
                    "type": "uint256"
                }
            ],
            "name": "TransactionRelayed",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": false,
                    "internalType": "enum IRelayHub.RelayCallStatus",
                    "name": "status",
                    "type": "uint8"
                },
                {
                    "indexed": false,
                    "internalType": "bytes",
                    "name": "returnValue",
                    "type": "bytes"
                }
            ],
            "name": "TransactionResult",
            "type": "event"
        },
        {
            "anonymous": false,
            "inputs": [
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "account",
                    "type": "address"
                },
                {
                    "indexed": true,
                    "internalType": "address",
                    "name": "dest",
                    "type": "address"
                },
                {
                    "indexed": false,
                    "internalType": "uint256",
                    "name": "amount",
                    "type": "uint256"
                }
            ],
            "name": "Withdrawn",
            "type": "event"
        },
        {
            "inputs": [],
            "name": "gasOverhead",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "gasReserve",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "maxWorkerCount",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "maximumRecipientDeposit",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "minimumStake",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "minimumUnstakeDelay",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "penalizer",
            "outputs": [
                {
                    "internalType": "address",
                    "name": "",
                    "type": "address"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "postOverhead",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "stakeManager",
            "outputs": [
                {
                    "internalType": "contract IStakeManager",
                    "name": "",
                    "type": "address"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [],
            "name": "versionHub",
            "outputs": [
                {
                    "internalType": "string",
                    "name": "",
                    "type": "string"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "",
                    "type": "address"
                }
            ],
            "name": "workerCount",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "",
                    "type": "address"
                }
            ],
            "name": "workerToManager",
            "outputs": [
                {
                    "internalType": "address",
                    "name": "",
                    "type": "address"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "uint256",
                    "name": "baseRelayFee",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "pctRelayFee",
                    "type": "uint256"
                },
                {
                    "internalType": "string",
                    "name": "url",
                    "type": "string"
                }
            ],
            "name": "registerRelayServer",
            "outputs": [],
            "stateMutability": "nonpayable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address[]",
                    "name": "newRelayWorkers",
                    "type": "address[]"
                }
            ],
            "name": "addRelayWorkers",
            "outputs": [],
            "stateMutability": "nonpayable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "target",
                    "type": "address"
                }
            ],
            "name": "depositFor",
            "outputs": [],
            "stateMutability": "payable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "target",
                    "type": "address"
                }
            ],
            "name": "balanceOf",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "uint256",
                    "name": "amount",
                    "type": "uint256"
                },
                {
                    "internalType": "address payable",
                    "name": "dest",
                    "type": "address"
                }
            ],
            "name": "withdraw",
            "outputs": [],
            "stateMutability": "nonpayable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "uint256",
                    "name": "paymasterMaxAcceptanceBudget",
                    "type": "uint256"
                },
                {
                    "components": [
                        {
                            "components": [
                                {
                                    "internalType": "address",
                                    "name": "from",
                                    "type": "address"
                                },
                                {
                                    "internalType": "address",
                                    "name": "to",
                                    "type": "address"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "value",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "gas",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "nonce",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "bytes",
                                    "name": "data",
                                    "type": "bytes"
                                }
                            ],
                            "internalType": "struct IForwarder.ForwardRequest",
                            "name": "request",
                            "type": "tuple"
                        },
                        {
                            "components": [
                                {
                                    "internalType": "uint256",
                                    "name": "gasPrice",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "pctRelayFee",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "baseRelayFee",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "address",
                                    "name": "relayWorker",
                                    "type": "address"
                                },
                                {
                                    "internalType": "address",
                                    "name": "paymaster",
                                    "type": "address"
                                },
                                {
                                    "internalType": "bytes",
                                    "name": "paymasterData",
                                    "type": "bytes"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "clientId",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "address",
                                    "name": "forwarder",
                                    "type": "address"
                                }
                            ],
                            "internalType": "struct GsnTypes.RelayData",
                            "name": "relayData",
                            "type": "tuple"
                        }
                    ],
                    "internalType": "struct GsnTypes.RelayRequest",
                    "name": "relayRequest",
                    "type": "tuple"
                },
                {
                    "internalType": "bytes",
                    "name": "signature",
                    "type": "bytes"
                },
                {
                    "internalType": "bytes",
                    "name": "approvalData",
                    "type": "bytes"
                },
                {
                    "internalType": "uint256",
                    "name": "externalGasLimit",
                    "type": "uint256"
                }
            ],
            "name": "relayCall",
            "outputs": [
                {
                    "internalType": "bool",
                    "name": "paymasterAccepted",
                    "type": "bool"
                },
                {
                    "internalType": "bytes",
                    "name": "returnValue",
                    "type": "bytes"
                }
            ],
            "stateMutability": "nonpayable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "components": [
                        {
                            "components": [
                                {
                                    "internalType": "address",
                                    "name": "from",
                                    "type": "address"
                                },
                                {
                                    "internalType": "address",
                                    "name": "to",
                                    "type": "address"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "value",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "gas",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "nonce",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "bytes",
                                    "name": "data",
                                    "type": "bytes"
                                }
                            ],
                            "internalType": "struct IForwarder.ForwardRequest",
                            "name": "request",
                            "type": "tuple"
                        },
                        {
                            "components": [
                                {
                                    "internalType": "uint256",
                                    "name": "gasPrice",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "pctRelayFee",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "baseRelayFee",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "address",
                                    "name": "relayWorker",
                                    "type": "address"
                                },
                                {
                                    "internalType": "address",
                                    "name": "paymaster",
                                    "type": "address"
                                },
                                {
                                    "internalType": "bytes",
                                    "name": "paymasterData",
                                    "type": "bytes"
                                },
                                {
                                    "internalType": "uint256",
                                    "name": "clientId",
                                    "type": "uint256"
                                },
                                {
                                    "internalType": "address",
                                    "name": "forwarder",
                                    "type": "address"
                                }
                            ],
                            "internalType": "struct GsnTypes.RelayData",
                            "name": "relayData",
                            "type": "tuple"
                        }
                    ],
                    "internalType": "struct GsnTypes.RelayRequest",
                    "name": "relayRequest",
                    "type": "tuple"
                },
                {
                    "internalType": "bytes",
                    "name": "signature",
                    "type": "bytes"
                },
                {
                    "internalType": "bytes",
                    "name": "approvalData",
                    "type": "bytes"
                },
                {
                    "components": [
                        {
                            "internalType": "uint256",
                            "name": "acceptanceBudget",
                            "type": "uint256"
                        },
                        {
                            "internalType": "uint256",
                            "name": "preRelayedCallGasLimit",
                            "type": "uint256"
                        },
                        {
                            "internalType": "uint256",
                            "name": "postRelayedCallGasLimit",
                            "type": "uint256"
                        }
                    ],
                    "internalType": "struct IPaymaster.GasLimits",
                    "name": "gasLimits",
                    "type": "tuple"
                },
                {
                    "internalType": "uint256",
                    "name": "totalInitialGas",
                    "type": "uint256"
                },
                {
                    "internalType": "uint256",
                    "name": "maxPossibleGas",
                    "type": "uint256"
                }
            ],
            "name": "innerRelayCall",
            "outputs": [
                {
                    "internalType": "enum IRelayHub.RelayCallStatus",
                    "name": "",
                    "type": "uint8"
                },
                {
                    "internalType": "bytes",
                    "name": "",
                    "type": "bytes"
                }
            ],
            "stateMutability": "nonpayable",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "uint256",
                    "name": "gasUsed",
                    "type": "uint256"
                },
                {
                    "components": [
                        {
                            "internalType": "uint256",
                            "name": "gasPrice",
                            "type": "uint256"
                        },
                        {
                            "internalType": "uint256",
                            "name": "pctRelayFee",
                            "type": "uint256"
                        },
                        {
                            "internalType": "uint256",
                            "name": "baseRelayFee",
                            "type": "uint256"
                        },
                        {
                            "internalType": "address",
                            "name": "relayWorker",
                            "type": "address"
                        },
                        {
                            "internalType": "address",
                            "name": "paymaster",
                            "type": "address"
                        },
                        {
                            "internalType": "bytes",
                            "name": "paymasterData",
                            "type": "bytes"
                        },
                        {
                            "internalType": "uint256",
                            "name": "clientId",
                            "type": "uint256"
                        },
                        {
                            "internalType": "address",
                            "name": "forwarder",
                            "type": "address"
                        }
                    ],
                    "internalType": "struct GsnTypes.RelayData",
                    "name": "relayData",
                    "type": "tuple"
                }
            ],
            "name": "calculateCharge",
            "outputs": [
                {
                    "internalType": "uint256",
                    "name": "",
                    "type": "uint256"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "relayManager",
                    "type": "address"
                }
            ],
            "name": "isRelayManagerStaked",
            "outputs": [
                {
                    "internalType": "bool",
                    "name": "",
                    "type": "bool"
                }
            ],
            "stateMutability": "view",
            "type": "function"
        },
        {
            "inputs": [
                {
                    "internalType": "address",
                    "name": "relayWorker",
                    "type": "address"
                },
                {
                    "internalType": "address payable",
                    "name": "beneficiary",
                    "type": "address"
                }
            ],
            "name": "penalize",
            "outputs": [],
            "stateMutability": "nonpayable",
            "type": "function"
        }
    ],
    "metadata": "{\"compiler\":{\"version\":\"0.6.10+commit.00c0fcaf\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract 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    "source": "/* solhint-disable avoid-low-level-calls */\n/* solhint-disable no-inline-assembly */\n/* solhint-disable not-rely-on-time */\n/* solhint-disable avoid-tx-origin */\n/* solhint-disable bracket-align */\n// SPDX-License-Identifier:MIT\npragma solidity ^0.6.9;\npragma experimental ABIEncoderV2;\n\nimport \"./utils/MinLibBytes.sol\";\nimport \"@openzeppelin/contracts/math/SafeMath.sol\";\n\nimport \"./utils/GsnUtils.sol\";\nimport \"./utils/GsnEip712Library.sol\";\nimport \"./interfaces/GsnTypes.sol\";\nimport \"./interfaces/IRelayHub.sol\";\nimport \"./interfaces/IPaymaster.sol\";\nimport \"./forwarder/IForwarder.sol\";\nimport \"./interfaces/IStakeManager.sol\";\n\ncontract RelayHub is IRelayHub {\n    using SafeMath for uint256;\n\n    string public override versionHub = \"2.0.0+opengsn.hub.irelayhub\";\n\n    uint256 public override minimumStake;\n    uint256 public override minimumUnstakeDelay;\n    uint256 public override maximumRecipientDeposit;\n    uint256 public override gasOverhead;\n    uint256 public override postOverhead;\n    uint256 public override gasReserve;\n    uint256 public override maxWorkerCount;\n    IStakeManager override public stakeManager;\n    address override public penalizer;\n\n    // maps relay worker's address to its manager's address\n    mapping(address => address) public override workerToManager;\n\n    // maps relay managers to the number of their workers\n    mapping(address => uint256) public override workerCount;\n\n    mapping(address => uint256) private balances;\n\n    constructor (\n        IStakeManager _stakeManager,\n        address _penalizer,\n        uint256 _maxWorkerCount,\n        uint256 _gasReserve,\n        uint256 _postOverhead,\n        uint256 _gasOverhead,\n        uint256 _maximumRecipientDeposit,\n        uint256 _minimumUnstakeDelay,\n        uint256 _minimumStake\n    ) public {\n        stakeManager = _stakeManager;\n        penalizer = _penalizer;\n        maxWorkerCount = _maxWorkerCount;\n        gasReserve = _gasReserve;\n        postOverhead = _postOverhead;\n        gasOverhead = _gasOverhead;\n        maximumRecipientDeposit = _maximumRecipientDeposit;\n        minimumUnstakeDelay = _minimumUnstakeDelay;\n        minimumStake =  _minimumStake;\n    }\n\n    function registerRelayServer(uint256 baseRelayFee, uint256 pctRelayFee, string calldata url) external override {\n        address relayManager = msg.sender;\n        require(\n            isRelayManagerStaked(relayManager),\n            \"relay manager not staked\"\n        );\n        require(workerCount[relayManager] > 0, \"no relay workers\");\n        emit RelayServerRegistered(relayManager, baseRelayFee, pctRelayFee, url);\n    }\n\n    function addRelayWorkers(address[] calldata newRelayWorkers) external override {\n        address relayManager = msg.sender;\n        workerCount[relayManager] = workerCount[relayManager] + newRelayWorkers.length;\n        require(workerCount[relayManager] <= maxWorkerCount, \"too many workers\");\n\n        require(\n            isRelayManagerStaked(relayManager),\n            \"relay manager not staked\"\n        );\n\n        for (uint256 i = 0; i < newRelayWorkers.length; i++) {\n            require(workerToManager[newRelayWorkers[i]] == address(0), \"this worker has a manager\");\n            workerToManager[newRelayWorkers[i]] = relayManager;\n        }\n\n        emit RelayWorkersAdded(relayManager, newRelayWorkers, workerCount[relayManager]);\n    }\n\n    function depositFor(address target) public override payable {\n        uint256 amount = msg.value;\n        require(amount <= maximumRecipientDeposit, \"deposit too big\");\n\n        balances[target] = balances[target].add(amount);\n\n        emit Deposited(target, msg.sender, amount);\n    }\n\n    function balanceOf(address target) external override view returns (uint256) {\n        return balances[target];\n    }\n\n    function withdraw(uint256 amount, address payable dest) public override {\n        address payable account = msg.sender;\n        require(balances[account] >= amount, \"insufficient funds\");\n\n        balances[account] = balances[account].sub(amount);\n        dest.transfer(amount);\n\n        emit Withdrawn(account, dest, amount);\n    }\n\n    function verifyGasLimits(\n        uint256 paymasterMaxAcceptanceBudget,\n        GsnTypes.RelayRequest calldata relayRequest,\n        uint256 initialGas\n    )\n    private\n    view\n    returns (IPaymaster.GasLimits memory gasLimits, uint256 maxPossibleGas) {\n        gasLimits =\n            IPaymaster(relayRequest.relayData.paymaster).getGasLimits{gas:50000}();\n\n        require(paymasterMaxAcceptanceBudget >= gasLimits.acceptanceBudget, \"unexpected high acceptanceBudget\");\n\n        maxPossibleGas =\n            gasOverhead.add(\n            gasLimits.preRelayedCallGasLimit).add(\n            gasLimits.postRelayedCallGasLimit).add(\n            relayRequest.request.gas);\n\n        // This transaction must have enough gas to forward the call to the recipient with the requested amount, and not\n        // run out of gas later in this function.\n        require(\n            initialGas >= maxPossibleGas,\n            \"Not enough gas left for innerRelayCall to complete\");\n\n        uint256 maxPossibleCharge = calculateCharge(\n            maxPossibleGas,\n            relayRequest.relayData\n        );\n\n        // We don't yet know how much gas will be used by the recipient, so we make sure there are enough funds to pay\n        // for the maximum possible charge.\n        require(maxPossibleCharge <= balances[relayRequest.relayData.paymaster],\n            \"Paymaster balance too low\");\n    }\n\n    struct RelayCallData {\n        bool success;\n        bytes4 functionSelector;\n        bytes recipientContext;\n        bytes relayedCallReturnValue;\n        IPaymaster.GasLimits gasLimits;\n        RelayCallStatus status;\n        uint256 innerGasUsed;\n        uint256 maxPossibleGas;\n        uint256 gasBeforeInner;\n        bytes retData;\n    }\n\n    function relayCall(\n        uint paymasterMaxAcceptanceBudget,\n        GsnTypes.RelayRequest calldata relayRequest,\n        bytes calldata signature,\n        bytes calldata approvalData,\n        uint externalGasLimit\n    )\n    external\n    override\n    returns (bool paymasterAccepted, bytes memory returnValue)\n    {\n        (signature);\n        RelayCallData memory vars;\n        vars.functionSelector = MinLibBytes.readBytes4(relayRequest.request.data, 0);\n        require(msg.sender == tx.origin, \"relay worker cannot be a smart contract\");\n        require(workerToManager[msg.sender] != address(0), \"Unknown relay worker\");\n        require(relayRequest.relayData.relayWorker == msg.sender, \"Not a right worker\");\n        require(\n            isRelayManagerStaked(workerToManager[msg.sender]),\n            \"relay manager not staked\"\n        );\n        require(relayRequest.relayData.gasPrice <= tx.gasprice, \"Invalid gas price\");\n        require(externalGasLimit <= block.gaslimit, \"Impossible gas limit\");\n\n        (vars.gasLimits, vars.maxPossibleGas) =\n             verifyGasLimits(paymasterMaxAcceptanceBudget, relayRequest, externalGasLimit);\n\n    {\n\n        //How much gas to pass down to innerRelayCall. must be lower than the default 63/64\n        // actually, min(gasleft*63/64, gasleft-GAS_RESERVE) might be enough.\n        uint256 innerGasLimit = gasleft()*63/64-gasReserve;\n        vars.gasBeforeInner = gasleft();\n\n        uint256 _tmpInitialGas = innerGasLimit + externalGasLimit + gasOverhead + postOverhead;\n        // Calls to the recipient are performed atomically inside an inner transaction which may revert in case of\n        // errors in the recipient. In either case (revert or regular execution) the return data encodes the\n        // RelayCallStatus value.\n        (bool success, bytes memory relayCallStatus) = address(this).call{gas:innerGasLimit}(\n            abi.encodeWithSelector(RelayHub.innerRelayCall.selector, relayRequest, signature, approvalData, vars.gasLimits,\n                _tmpInitialGas - gasleft(),\n                vars.maxPossibleGas\n                )\n        );\n        vars.success = success;\n        vars.innerGasUsed = vars.gasBeforeInner-gasleft();\n        (vars.status, vars.relayedCallReturnValue) = abi.decode(relayCallStatus, (RelayCallStatus, bytes));\n        if ( vars.relayedCallReturnValue.length>0 ) {\n            emit TransactionResult(vars.status, vars.relayedCallReturnValue);\n        }\n    }\n    {\n        if (!vars.success) {\n            //Failure cases where the PM doesn't pay\n            if ( (vars.innerGasUsed < vars.gasLimits.acceptanceBudget ) && (\n                    vars.status == RelayCallStatus.RejectedByPreRelayed ||\n                    vars.status == RelayCallStatus.RejectedByForwarder ||\n                    vars.status == RelayCallStatus.RejectedByRecipientRevert  //can only be thrown if rejectOnRecipientRevert==true\n            )) {\n                paymasterAccepted=false;\n\n                emit TransactionRejectedByPaymaster(\n                    workerToManager[msg.sender],\n                    relayRequest.relayData.paymaster,\n                    relayRequest.request.from,\n                    relayRequest.request.to,\n                    msg.sender,\n                    vars.functionSelector,\n                    vars.innerGasUsed,\n                    vars.relayedCallReturnValue);\n                return (false, vars.relayedCallReturnValue);\n            }\n        }\n        // We now perform the actual charge calculation, based on the measured gas used\n        uint256 gasUsed = (externalGasLimit - gasleft()) + gasOverhead;\n        uint256 charge = calculateCharge(gasUsed, relayRequest.relayData);\n\n        balances[relayRequest.relayData.paymaster] = balances[relayRequest.relayData.paymaster].sub(charge);\n        balances[workerToManager[msg.sender]] = balances[workerToManager[msg.sender]].add(charge);\n\n        emit TransactionRelayed(\n            workerToManager[msg.sender],\n            msg.sender,\n            relayRequest.request.from,\n            relayRequest.request.to,\n            relayRequest.relayData.paymaster,\n            vars.functionSelector,\n            vars.status,\n            charge);\n        return (true, \"\");\n    }\n    }\n\n    struct InnerRelayCallData {\n        uint256 balanceBefore;\n        bytes32 preReturnValue;\n        bool relayedCallSuccess;\n        bytes relayedCallReturnValue;\n        bytes recipientContext;\n        bytes data;\n        bool rejectOnRecipientRevert;\n    }\n\n    function innerRelayCall(\n        GsnTypes.RelayRequest calldata relayRequest,\n        bytes calldata signature,\n        bytes calldata approvalData,\n        IPaymaster.GasLimits calldata gasLimits,\n        uint256 totalInitialGas,\n        uint256 maxPossibleGas\n    )\n    external\n    returns (RelayCallStatus, bytes memory)\n    {\n        InnerRelayCallData memory vars;\n        // A new gas measurement is performed inside innerRelayCall, since\n        // due to EIP150 available gas amounts cannot be directly compared across external calls\n\n        // This external function can only be called by RelayHub itself, creating an internal transaction. Calls to the\n        // recipient (preRelayedCall, the relayedCall, and postRelayedCall) are called from inside this transaction.\n        require(msg.sender == address(this), \"Only RelayHub should call this function\");\n\n        // If either pre or post reverts, the whole internal transaction will be reverted, reverting all side effects on\n        // the recipient. The recipient will still be charged for the used gas by the relay.\n\n        // The recipient is no allowed to withdraw balance from RelayHub during a relayed transaction. We check pre and\n        // post state to ensure this doesn't happen.\n        vars.balanceBefore = balances[relayRequest.relayData.paymaster];\n\n        // First preRelayedCall is executed.\n        // Note: we open a new block to avoid growing the stack too much.\n        vars.data = abi.encodeWithSelector(\n            IPaymaster.preRelayedCall.selector,\n                relayRequest, signature, approvalData, maxPossibleGas\n        );\n        {\n            bool success;\n            bytes memory retData;\n            (success, retData) = relayRequest.relayData.paymaster.call{gas:gasLimits.preRelayedCallGasLimit}(vars.data);\n            if (!success) {\n                GsnEip712Library.truncateInPlace(retData);\n                revertWithStatus(RelayCallStatus.RejectedByPreRelayed, retData);\n            }\n            (vars.recipientContext, vars.rejectOnRecipientRevert) = abi.decode(retData, (bytes,bool));\n        }\n\n        // The actual relayed call is now executed. The sender's address is appended at the end of the transaction data\n\n        {\n            bool forwarderSuccess;\n            (forwarderSuccess, vars.relayedCallSuccess, vars.relayedCallReturnValue) = GsnEip712Library.execute(relayRequest, signature);\n            if ( !forwarderSuccess ) {\n                revertWithStatus(RelayCallStatus.RejectedByForwarder, vars.relayedCallReturnValue);\n            }\n\n            if (vars.rejectOnRecipientRevert && !vars.relayedCallSuccess) {\n                //we trusted the recipient, but it reverted...\n                revertWithStatus(RelayCallStatus.RejectedByRecipientRevert, vars.relayedCallReturnValue);\n            }\n        }\n        // Finally, postRelayedCall is executed, with the relayedCall execution's status and a charge estimate\n        // We now determine how much the recipient will be charged, to pass this value to postRelayedCall for accurate\n        // accounting.\n        vars.data = abi.encodeWithSelector(\n            IPaymaster.postRelayedCall.selector,\n            vars.recipientContext,\n            vars.relayedCallSuccess,\n            totalInitialGas - gasleft(), /*gasUseWithoutPost*/\n            relayRequest.relayData\n        );\n\n        {\n        (bool successPost,bytes memory ret) = relayRequest.relayData.paymaster.call{gas:gasLimits.postRelayedCallGasLimit}(vars.data);\n\n        if (!successPost) {\n            revertWithStatus(RelayCallStatus.PostRelayedFailed, ret);\n        }\n        }\n\n        if (balances[relayRequest.relayData.paymaster] < vars.balanceBefore) {\n            revertWithStatus(RelayCallStatus.PaymasterBalanceChanged, \"\");\n        }\n\n        return (vars.relayedCallSuccess ? RelayCallStatus.OK : RelayCallStatus.RelayedCallFailed, vars.relayedCallReturnValue);\n    }\n\n    /**\n     * @dev Reverts the transaction with return data set to the ABI encoding of the status argument (and revert reason data)\n     */\n    function revertWithStatus(RelayCallStatus status, bytes memory ret) private pure {\n        bytes memory data = abi.encode(status, ret);\n        GsnEip712Library.truncateInPlace(data);\n\n        assembly {\n            let dataSize := mload(data)\n            let dataPtr := add(data, 32)\n\n            revert(dataPtr, dataSize)\n        }\n    }\n\n    function calculateCharge(uint256 gasUsed, GsnTypes.RelayData calldata relayData) public override virtual view returns (uint256) {\n        //       relayData.baseRelayFee + (gasUsed * relayData.gasPrice * (100 + relayData.pctRelayFee)) / 100;\n        return relayData.baseRelayFee.add((gasUsed.mul(relayData.gasPrice).mul(relayData.pctRelayFee.add(100))).div(100));\n    }\n\n    function isRelayManagerStaked(address relayManager) public override view returns (bool) {\n        return stakeManager.isRelayManagerStaked(relayManager, address(this), minimumStake, minimumUnstakeDelay);\n    }\n\n    modifier penalizerOnly () {\n        require(msg.sender == penalizer, \"Not penalizer\");\n        _;\n    }\n\n    function penalize(address relayWorker, address payable beneficiary) external override penalizerOnly {\n        address relayManager = workerToManager[relayWorker];\n        // The worker must be controlled by a manager with a locked stake\n        require(relayManager != address(0), \"Unknown relay worker\");\n        require(\n            isRelayManagerStaked(relayManager),\n            \"relay manager not staked\"\n        );\n        IStakeManager.StakeInfo memory stakeInfo = stakeManager.getStakeInfo(relayManager);\n        stakeManager.penalizeRelayManager(relayManager, beneficiary, stakeInfo.stake);\n    }\n}\n",
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                                                    "id": 1272,
                                                    "mutability": "mutable",
                                                    "name": "relayCallStatus",
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                                                    "scope": 1345,
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                                                    "storageLocation": "memory",
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                                                        "typeString": "bytes"
                                                    },
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                                                            "typeIdentifier": "t_bytes_storage_ptr",
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                                                        }
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                                                                    "src": "7924:4:5",
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                                                                        "typeString": "struct RelayHub.RelayCallData memory"
                                                                    }
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                                                                    "typeIdentifier": "t_bytes4",
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                                                                },
                                                                {
                                                                    "typeIdentifier": "t_bytes_calldata_ptr",
                                                                    "typeString": "bytes calldata"
                                                                },
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                                                                    "typeIdentifier": "t_struct$_GasLimits_$3253_memory_ptr",
                                                                    "typeString": "struct IPaymaster.GasLimits memory"
                                                                },
                                                                {
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                                                                    "typeIdentifier": "t_uint256",
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                                                                    "name": "this",
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                                                                    "src": "7709:4:5",
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                                                                        "typeIdentifier": "t_contract$_RelayHub_$1878",
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                                                                    }
                                                                }
                                                            ],
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                                                                    {
                                                                        "typeIdentifier": "t_contract$_RelayHub_$1878",
                                                                        "typeString": "contract RelayHub"
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                                                                "nodeType": "ElementaryTypeNameExpression",
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                                                            "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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                                                            "argumentTypes": null,
                                                            "id": 1278,
                                                            "name": "innerGasLimit",
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                                                        "src": "7981:4:5",
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                                                            "typeIdentifier": "t_struct$_RelayCallData_$1132_memory_ptr",
                                                            "typeString": "struct RelayHub.RelayCallData memory"
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                                                    },
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                                                    "lValueRequested": true,
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                                                            "typeString": "struct RelayHub.RelayCallData memory"
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                                                        "typeString": "uint256"
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                                                            "src": "8033:4:5",
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                                                                "typeString": "struct RelayHub.RelayCallData memory"
                                                            }
                                                        },
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                                                        "memberName": "gasBeforeInner",
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                                                        "src": "8033:19:5",
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                                                            "typeString": "uint256"
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                                                    "id": 1272,
                                                    "mutability": "mutable",
                                                    "name": "relayCallStatus",
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                                                    "scope": 1345,
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                                                    "storageLocation": "memory",
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                                                        "typeString": "bytes"
                                                    },
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                                                            "typeIdentifier": "t_bytes_storage_ptr",
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                                                        }
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                                                                    "src": "7924:4:5",
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                                                                        "typeString": "struct RelayHub.RelayCallData memory"
                                                                    }
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                                                                    "typeIdentifier": "t_bytes4",
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                                                                },
                                                                {
                                                                    "typeIdentifier": "t_bytes_calldata_ptr",
                                                                    "typeString": "bytes calldata"
                                                                },
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                                                                    "typeIdentifier": "t_struct$_GasLimits_$3253_memory_ptr",
                                                                    "typeString": "struct IPaymaster.GasLimits memory"
                                                                },
                                                                {
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                                                                    "typeIdentifier": "t_uint256",
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                                                                    "name": "this",
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                                                                    "src": "7709:4:5",
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                                                                        "typeIdentifier": "t_contract$_RelayHub_$1878",
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                                                                    }
                                                                }
                                                            ],
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                                                                    {
                                                                        "typeIdentifier": "t_contract$_RelayHub_$1878",
                                                                        "typeString": "contract RelayHub"
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                                                                "nodeType": "ElementaryTypeNameExpression",
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                                                            "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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                                                            "argumentTypes": null,
                                                            "id": 1278,
                                                            "name": "innerGasLimit",
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                                                        "src": "7981:4:5",
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                                                            "typeIdentifier": "t_struct$_RelayCallData_$1132_memory_ptr",
                                                            "typeString": "struct RelayHub.RelayCallData memory"
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                                                    },
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                                                    "lValueRequested": true,
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                                                            "typeString": "struct RelayHub.RelayCallData memory"
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                                                        "typeString": "uint256"
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                                                            "src": "8033:4:5",
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                                                                "typeString": "struct RelayHub.RelayCallData memory"
                                                            }
                                                        },
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                                                        "memberName": "gasBeforeInner",
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                                                        "src": "8033:19:5",
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                                                            "typeString": "uint256"
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