文件列表:

LICENSE (35149, 2023-01-21)
artifacts (0, 2023-01-21)
artifacts\CallMe.json (31733, 2023-01-21)
artifacts\CallMe_metadata.json (1904, 2023-01-21)
artifacts\HelloWorld.json (432698, 2023-01-21)
artifacts\HelloWorld_metadata.json (2843, 2023-01-21)
artifacts\MakeCall.json (125125, 2023-01-21)
artifacts\MakeCall_metadata.json (2830, 2023-01-21)
artifacts\test3.json (99813, 2023-01-21)
artifacts\test3_metadata.json (1070, 2023-01-21)
average.sol (1271, 2023-01-21)
calling.sol (568, 2023-01-21)
calling (0, 2023-01-21)
calling\contracts (0, 2023-01-21)
calling\contracts\calling.sol (821, 2023-01-21)
calling\contracts\makecall.sol (2140, 2023-01-21)
calling\migrations (0, 2023-01-21)
calling\migrations\1_deploy_contracts.js (192, 2023-01-21)
calling\test (0, 2023-01-21)
calling\truffle-config.js (4826, 2023-01-21)
contract1.sol (2575, 2023-01-21)
decompile (0, 2023-01-21)
decompile\contracts (0, 2023-01-21)
decompile\contracts\Inbox.sol (491, 2023-01-21)
decompile\contracts\Migrations.sol (518, 2023-01-21)
decompile\decompiled (0, 2023-01-21)
decompile\decompiled\bytecode (6485, 2023-01-21)
decompile\decompiled\v1.sol (2630, 2023-01-21)
decompile\decompiled\v2.sol (18160, 2023-01-21)
decompile\migrations (0, 2023-01-21)
decompile\migrations\1_initial_migration.js (125, 2023-01-21)
... ...

# DumbContracts Learning and playing with Ethereum Smart Contracts ## Setup Make sure to start `ganache` in a background terminal to act as our blockchain. ## Truffle Make a directory for the code. The project will be a basic inbox. ```bash mkdir inboxProject cd inboxProject truffle init truffle create contract Inbox truffle create test Inbox ``` Some notes say to use `truffle unbox` instead. Compile a project: ```bash truffle compile ``` Modify the `truffle-config.js` file to point at ganache. ```js development: { host: "127.0.0.1", // Localhost (default: none) port: 8545, // Standard Ethereum port (default: none) network_id: "*", // Any network (default: none) } ``` Check the migrations file `migrations/1_deploy.js` ```js const Inbox = artifacts.require("Inbox"); module.exports = function(deployer) { // The contract name followed by parameters to the constructor. deployer.deploy(Inbox, "Message 1"); }; ``` To get into the truffle console: ```bash truffle develop ``` Migrate / deploy the contract then do stuff with it: ``` truffle(develop)> migrate ... Summary ======= > Total deployments: 1 > Final cost: 0.001666143 ETH truffle(develop)> let instance = await Inbox.deployed() undefined truffle(develop)> let inbox = instance.getMessage() undefined truffle(develop)> instance.setMessage("***") { tx: '0x47d229d7b827f2d603a181b6b6***3dc7d008a53650835ab***5789466bee39fb0', receipt: { transactionHash: '0x47d229d7b827f2d603a181b6b6***3dc7d008a53650835ab***5789466bee39fb0', transactionIndex: 0, blockNumber: 2, blockHash: '0xfb3c931d5a9733d954f22203178d4ac0***c79428a26abe0f5dec845d8767a6a4', from: '0xc9cf9***33173a4741e706704679aa93e9c605a58', to: '0xc1462c4a0efea0c29468729dd00c903018ebb3da', cumulativeGasUsed: 28050, gasUsed: 28050, contractAddress: null, logs: [], logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 00', status: true, effectiveGasPrice: 3281690333, type: '0x2', rawLogs: [] }, logs: [] } truffle(develop)> instance.getMessage() '***' ``` Trying to work out how to access a contract by address from inside truffle. Using require looks promising but can't make it work. [https://ethereum.stackexchange.com/questions/45305/truffle-develop-get-new-contract-instance-from-contract-address] [Some useful stuff here][developDeploy] ## Tools * [Panoramix][panoramix] * [dedaub][dedaub] * [ethervm][ethervm] * [Truffle Flattener][truffleflatten] - Squashes a Truffle project down into a single file to make debugging easier * [vim-solidity][vimsolidity] - Vim Plugin ## Install Install latest version of NodeJS: ``` curl -sL https://deb.nodesource.com/setup_19.x -o /tmp/nodesource_setup.sh sudo bash /tmp/nodesource_setup.sh ``` Now install Ganache and Truffle ``` sudo npm install -g ganache truffle ``` ## Tutorials and useful stuff * [REVERSE ENGINEERING A CONTRACT][rev1] * [Debugging Contracts][debug1] * [A good video on setting up VS Code][vscodelink] * [Some example code][byexample] * [Flash load code example][aaveflashloan] Three ways to send cash, [this paper][transfer] talks about them and the security problems with them. * [Calling other contracts][calling]. * [Video on using encoding methods][videoEncoding]. * [Video workshop on decompiling contracts][videoDecompileWorkshop]. [byexample]: https://solidity-by-example.org/sending-ether/ [vscodelink]: https://www.youtube.com/watch?v=tcnpGeOiA_ [transfer]: https://fravoll.github.io/solidity-patterns/secure_ether_transfer.html [calling]: https://medium.com/@blockchain101/calling-the-function-of-another-contract-in-solidity-f9edfa921f4c [videoEncoding]: https://www.youtube.com/watch?v=70_2YHJvKIc [videoDecompileWorkshop]: https://archive.devcon.org/archive/watch/5/the-inner-workings-of-a-smart-contract-decompiler/?tab=YouTube [panoramix]: https://github.com/palkeo/panoramix [dedaub]: https://library.dedaub.com/decompile [ethervm]: https://ethervm.io/decompile [rev1]: https://ethereum.org/en/developers/tutorials/reverse-engineering-a-contract/ [developDeploy]: https://blog.logrocket.com/truffle-suite-tutorial-develop-ethereum-smart-contracts/ [vimsolidity]: https://github.com/tomlion/vim-solidity [debug1]: https://medium.com/linum-labs/error-vm-exception-while-processing-transaction-revert-8cd856633793 [truffleflatten]: https://www.npmjs.com/package/truffle-flattener [aaveflashloan]: https://www.quicknode.com/guides/defi/how-to-make-a-flash-loan-using-aave

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