Ethereum Solidity Examples

This is a very basic intro repo with solidity contracts. It's intended to be a display for educational purpose only. I've used Truffle for project templated, truffle is also the general tool used for compiling.

Projects Outline

ERC721 Non-Fungible Token Project

Crypto Monsters Blockchain Game

---

ERC721 solidity contract token implementaion. Simple solidity game on the blockchain. Create Crypto Monsters much like an over simplified version of Crypto Kitties. Create Monster > give it level attack power, defense power and make it battle other monster that you've created.

FoodSafe Project

End to end sample distributed application (dapp) running on the Ethereum blockchain.

Tech: Web3.js, Ethereum, Solidity, Truffle, Metamask, Webpack.

Goals

Interact with Ethereum

Utilize Truffle Client

Interact Web3.js > Make RPC calls on our behalf

Utilize the power of Metamask > All interaction with accounts yeasy to do > All plumbing for authentication is done easily

Utilize Webpack > Take all assets through the webpack module bundler

HelloWorld Project

Basic hello world solidity contract implementaion.

Deployment

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Deploy via Truffle

> truffle compile

> truffle migrate

if you hve more than one destination defined in your deploy specs, look at truffle.js for network configs. Speciry the network name

> truffle migrate --network development

Configuration

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Truffle Config file truffle.js

Add your local, testnet, mainnet configs here.

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  networks: {
    development: {
      host: "localhost", // local testRPC host
      port: 8545, // local testRPC port
      network_id: "*" // Match any network id
    }
  },
   networks: {
    staging: {
      host: "xxx", // Ehtereum RPC endpoint - no http or https, just host 
      port: 1111, //  Ehtereum RPC port
      network_id: "*" // Match any network id
    }
  }
};

Truffle Console Interract with your contract via Truffle Console

PS <...>\Ethereum-Solidity\FoodSafe> truffle console

truffle(development)> var fs
undefined

truffle(development)> FoodSafe.deployed().then(function(deployed){fs=deployed;});
undefined

PS C:\Users\Angelina\Desktop\GIT\Ethereum-Solidity\FoodSafe> truffle console

truffle(development)> var fs
undefined

truffle(development)> FoodSafe.deployed().then(function(deployed){fs=deployed;});
undefined

truffle(development)> fs.AddNewLocation(123456, "The Store","sdsd");
{ tx: '0x29dd21908fdc3321699fe077494b136a8b92025061439ab979870fda92a6e5ca',
  receipt:
   { transactionHash: '0x29dd21908fdc3321699fe077494b136a8b92025061439ab979870fda92a6e5ca',
     transactionIndex: 0,
     blockHash: '0xb8152b6a92f7dcae61d766bba8713bcf297258c83f1f8eb2dfafb5fe23ad3226',
     blockNumber: 7,
     gasUsed: 117140,
     cumulativeGasUsed: 117140,
     contractAddress: null,
     logs: [],
     status: 1 },
  logs: [] }
  
truffle(development)> truffle(development)> fs.GetLocation(0);
[ 'The Supplier',
  BigNumber { s: 1, e: 5, c: [ 123456 ] },
  BigNumber { s: 1, e: 0, c: [ 0 ] } ]