OP eco-system tools for scalability and maintenance, support, service of public infrastructure

Author: d.kotwal

Asset-Management-Spare-Parts/.DS_Store

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+node_modules
+
+#Hardhat files
+cache
+artifacts

Asset-Management-Spare-Parts/free-OP-Tx-public-infra-opengsn/.gitignore

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+# Free OP transactions for public infrastructure support and maintenance

Asset-Management-Spare-Parts/free-OP-Tx-public-infra-opengsn/README.md

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+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+import "@opengsn/contracts/src/BaseRelayRecipient.sol";
+
+contract Greeter is BaseRelayRecipient {
+  string greeting;
+  address lastGreeter;
+
+  event LogEntry(address indexed _soliditySender, 
+                 address _gsnSender,
+                 address _trustedForwarder,
+                 address _lastGreeter,
+                 bytes _data);
+
+
+  constructor(string memory _greeting, address _trustedForwarderAddr) {
+    greeting = _greeting;
+    _setTrustedForwarder(_trustedForwarderAddr);
+    lastGreeter = _msgSender();
+  }
+
+  function versionRecipient() external virtual view override returns (string memory) {
+    return "v. 1.0.0";
+  }
+
+  function greet() public view returns (string memory) {
+    return greeting;
+  }
+
+  function lastGreeterAddr() public view returns (address) {
+    return lastGreeter;
+  }
+
+  function setGreeting(string memory _greeting) public {
+
+    emit LogEntry(msg.sender, 
+                 _msgSender(),
+                 trustedForwarder(),
+                 lastGreeter,
+                msg.data );
+    
+    greeting = _greeting;
+    lastGreeter = _msgSender();
+  }
+
+
+
+}

Asset-Management-Spare-Parts/free-OP-Tx-public-infra-opengsn/contracts/Greeter.sol

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+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+pragma experimental ABIEncoderV2;
+
+import "@opengsn/contracts/src/BasePaymaster.sol";
+
+/**
+ * a paymaster for a single recipient contract.
+ * - reject requests if destination is not the target contract.
+ * - reject any request if the target contract reverts.
+ */
+contract SingleRecipientPaymaster is BasePaymaster {
+
+    address public target;
+
+    event TargetChanged(address oldTarget, address newTarget);
+
+    constructor(address _target) {
+        target=_target;
+    }
+
+    function versionPaymaster() external view override virtual returns (string memory){
+        return "2.2.0+opengsn.recipient.ipaymaster";
+    }
+
+    function setTarget(address _target) external onlyOwner {
+        emit TargetChanged(target, _target);
+        target=_target;
+    }
+
+    function preRelayedCall(
+        GsnTypes.RelayRequest calldata relayRequest,
+        bytes calldata signature,
+        bytes calldata approvalData,
+        uint256 maxPossibleGas
+    )
+    external
+    override
+    virtual
+    returns (bytes memory context, bool revertOnRecipientRevert) {
+        (relayRequest, signature, approvalData, maxPossibleGas);
+        require(relayRequest.request.to==target, "wrong target");
+	//returning "true" means this paymaster accepts all requests that
+	// are not rejected by the recipient contract.
+        return ("", true);
+    }
+
+    function postRelayedCall(
+        bytes calldata context,
+        bool success,
+        uint256 gasUseWithoutPost,
+        GsnTypes.RelayData calldata relayData
+    ) external override virtual {
+        (context, success, gasUseWithoutPost, relayData);
+    }
+}

Asset-Management-Spare-Parts/free-OP-Tx-public-infra-opengsn/contracts/SingleRecipientPaymaster.sol

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+// Plugins
+require('@nomiclabs/hardhat-ethers')
+
+// No need for a real mnemonic when you send free transactions
+junkMnemonic = 'test test test test test test test test test test test junk'
+
+
+module.exports = {
+  networks: {
+    hardhat: {
+      accounts: {
+        mnemonic: junkMnemonic
+      }
+    },
+    'optimistic-kovan-orig': {
+      chainId: 69,
+      url: 'https://kovan.optimism.io',
+      accounts: {
+         mnemonic: junkMnemonic
+      }
+    },    
+    'optimistic-mainnet': {
+      chainId: 10,
+      url: 'https://mainnet.optimism.io',
+      accounts: {
+         mnemonic: junkMnemonic
+      }
+    },
+  },
+  solidity: '0.8.9',
+}

Asset-Management-Spare-Parts/free-OP-Tx-public-infra-opengsn/hardhat.config.js

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+{
+  "name": "hardhat-project",
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.5",
+    "@nomiclabs/hardhat-waffle": "^2.0.3",
+    "chai": "^4.3.6",
+    "ethereum-waffle": "^3.4.4",
+    "ethers": "^5.6.1",
+    "hardhat": "^2.9.1"
+  },
+  "dependencies": {
+    "@opengsn/contracts": "^2.2.6",
+    "@opengsn/provider": "^2.2.6",
+    "dotenv": "^16.0.0",
+    "web3-eth-contract": "^1.7.1",
+    "web3-providers-http": "^1.7.1"
+  }
+}