Dart/Flutter Solidity

Generated by the Very Good CLI 🤖

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Getting Started 🚀

This project uses:

• Visual Studio Code Insider - Version: 1.64.0-insider (Universal)
• Remix IDE - Version 1.3.3 (1.3.3.680)
• Ganache - Version 2.5.4 (2.5.4.1367)
• Dart - Dart SDK version: 2.14.4 (stable)
• Flutter - Flutter Channel beta, 2.8.0-3.3.pre, on macOS 12.1 21C5021h darwin-x64

This project contains 3 parts:

• contracts
• flutter app

SimpleListContract

This smart contract handles simple CRUD functions in Solidity

Solidity:

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract SimpleListContract {
    address[] public people;
    address[] private auxArray;


    function addPerson(address _address) public {
        people.push(_address);
    }

    function getPeople() public view returns(address[] memory){
        return people;
    }

    function removePerson(address _value) public{

    address[] memory emptyAddress;

    for (uint i = 0; i < people.length; i++){
        if (people[i] != _value){
            auxArray.push(people[i]);
        }
    }
       people = auxArray;
       auxArray = emptyAddress;
    }

}

Dart:

import 'dart:math';

import 'package:http/http.dart';
import 'package:wallet_core/wallet_core.dart';
import 'package:web3dart/web3dart.dart';

import 'lib/contracts/abi/simple_list.dart';

void test() async {
  var apiUrl = 'http://localhost:7545'; //Replace with your API
  final client = Web3Client(apiUrl, Client());

  final credentials = EthPrivateKey.fromHex(
    '12889a81fab17152a1b3374e973edfd288a226cbc7745b63543b7c0e02e47355',
  );

  final ownAddress = await credentials.extractAddress();
  final contractAddr = EthereumAddress.fromHex(
    '0x7547587bC874e2d35197206FEf34C84FEEfF1202',
  );

  // read the contract abi and tell web3dart where it's deployed (contractAddr)
  final contract = DeployedContract(
    ContractAbi.fromJson(simpleListAbi, 'SimpleListContract'),
    contractAddr,
  );

  // Extracting some functions that we'll need later
  final getPeople = contract.function('getPeople');
  final addPerson = contract.function('addPerson');
  final removePerson = contract.function('removePerson');

  await client.sendTransaction(
    credentials,
    Transaction.callContract(
      contract: contract,
      function: addPerson,
      parameters: [ownAddress],
    ),
  );

  for (var i = 0; i < 10; i++) {
    final addPersonResult = await client.sendTransaction(
      credentials,
      Transaction.callContract(
        contract: contract,
        function: addPerson,
        parameters: [EthPrivateKey.createRandom(Random()).address],
      ),
    );

    /// Transaction successful, id: 0x0bf35baf5609fffb740555521a06c2abc7d1324dffe2c02429b1770044759a5e
    print('Transaction successful, id: $addPersonResult');
  }

  final getPeopleResult = await client.call(
    contract: contract,
    function: getPeople,
    params: [],
  );

  final removePersonResult = await client.sendTransaction(
    credentials,
    Transaction.callContract(
      contract: contract,
      function: removePerson,
      parameters: [ownAddress],
    ),
  );

  print('List of all people on the blockchain: ${getPeopleResult.first}');

  /// List of all people on the blockchain: [
  ///  0x2ffbdfb832d5295efc087db2e0fd1adeee3439de,
  ///  0x2ffbdfb832d5295efc087db2e0fd1adeee3439de,
  ///  0x2ffbdfb832d5295efc087db2e0fd1adeee3439de
  ///  ]
}