Chalk

Dracma Token

Comandos

npx create-react-app chalk npm start

Configuração

Instalar truffle

$ npm install -g truffle

Inicializar o projeto com a estrutura do truffle

$ truffle init

Depois do comando teremos a estrutura a seguir no projeto

contracts/: Diretorio dos smart contracts Solidity
migrations/: Diretorio dos arquivos de deployment
test/: Diretorio de arquivos de teste da aplicação e smart contracts
truffle-config.js: Arquivo de configuração do Truffle

Inicializar projeto com npm

$ npm init -y

Simulador blockchain Truffle

$ truffle develop

Será inicializado a blockchain local no endereço http://localhost:9545 e criado algumas wallets com o address, private key e o Mnemonic com as palavras chave.

Caso o contrato seja um token, instalar a dependência pelo npm

$ npm install @openzeppelin/contracts

Compilar contrato

De dentro do ambiente de dev do Truffle, executar o comando

$ compile

Deploy do contrato

Lembrando que o contrato deve estar na pasta contracts/

$ migrate

Pegar contas pelo web3.js

const accounts = web3.eth.getAccounts()

Instanciando contrato

const dracmaToken = await DracmaToken.deployed()

Deploy em rede de Testes

O deploy do smart contract será na rede Ropsten

Alterar arquivo truffle-config.js

const HDWalletProvider = require('@truffle/hdwallet-provider');
require('dotenv').config();

module.exports = {
    networks: {
        ropsten: {
            provider: () => new HDWalletProvider(process.env.MNEMONIC, process.env.INFURA_URL),
            network_id: process.env.NETWORK_ID,
            gas: 5500000,        // Ropsten has a lower block limit than mainnet
            confirmations: 2,    // # of confs to wait between deployments. (default: 0)
            timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
            skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
        }
    }
}

Necessário configurar as váriaveis de ambiente MNEMONIC, INFURA_URL e NETWORK_ID

Deploy do contrato em rede de teste

$ truffle migrate --network ropsten

Smart Contract Migrations

Transaction hash: 0xed441a6a621b30bb86c0214b5a4488aaef51ee9284263f44b08c5d6efef01979
Contract Address: 0x27008013f3A2421D8Da88411c5527a9Af4f8cfA4
Blocks: 1 Seconds: 25
block number: 11311435
block timestamp: 1635364769
account: 0x864d6654D79e5BD295234d9577d07104AAe05968
balance: 1.229574459270839156
gas used: 250142 (0x3d11e)
gas price: 2.136305606 gwei
value sent: 0 ETH
total cost: 0.000534379756896052 ETH

Smart Contract DracmaToken

transaction hash: 0x668c1420b5fd7830919793a8480e0cbc72360696ca0ea69eba9965583c0939e6
Blocks: 4 Seconds: 99
contract address: 0x2fb11D34B18ad29BDB8756642F64A5814273F1B4
block number: 11311441
block timestamp: 1635364879
account: 0x864d6654D79e5BD295234d9577d07104AAe05968
balance: 1.224633814618894423
gas used: 2266792 (0x2296a8)
gas price: 2.136305604 gwei
value sent: 0 ETH
total cost: 0.004842560452702368 ETH

Casos de Teste

msg.sender = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4

Deploy do contrato
- Gas da transacao
- Gwei: 2197925
- Wei: 2197925000000000
- Ether: 0.002197925
- Dolar: $8.94
Transacao setQuote
- Wei: 240000000000000
- Ether: 0.00024
- Dolar: $1.00
- Valor da transacao
  - Gas em Gwei: 45975
  - Ether: 0.000045975
  - Dolar: $0.19
Transacao registerEducationalInstitution
- idInstitution1: 0x64613031343338322d393261632d346334332d383530652d3431363334396438
- address: 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2
  - Valor da transacao
  - Gas em gwei: 69578
  - Ether: 0.000069578
  - Dolar: $0.29
  - json input: {"0x64613031343338322d393261632d346334332d383530652d3431363334396438", "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2"}
- idInstitution2: 0x65393932356236632d373332372d343237302d396133342d6163643632626165
- address: 0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c
  - Valor da transacao
  - Gas em gwei: 69578
  - Ether: 0.000069578
  - Dolar: $0.29
  - json input: {"0x65393932356236632d373332372d343237302d396133342d6163643632626165", "0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c"}
Transação buy tokens - institutionId1: 0x64613031343338322d393261632d346334332d383530652d3431363334396438
- numTokens: 10000
- valor cotacao: 240000000000000
- valor em ether: 2.4
- valor em dolar: $9758.69
- address account: 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2
- total tokens atual: 1000000000000000000000000
- total tokens apos transacao: 999999999999999999990000
- json input: {"10000", "0x64613031343338322d393261632d346334332d383530652d3431363334396438"}
- Valor da Transação
- Gas em gwei: 69415
- Ether: 0.000069415
- Dolar: $0.28
- institutionId2: 0x65393932356236632d373332372d343237302d396133342d6163643632626165
- numTokens: 10000
- valor cotacao: 240000000000000
- valor em ether: 2.4
- valor em dolar: $9758.69
- address account: 0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c
- total tokens atual: 999999999999999999990000
- total tokens apos transacao: 999999999999999999980000
- json input: {"10000", "0x65393932356236632d373332372d343237302d396133342d6163643632626165"}
- Valor da Transação
- Gas em gwei: 69090
- Ether: 0.00006909
- Dolar: $0.28
Approve - Dando permissao para o sender usar a qtde de tokens informada
- Valor da Transação
- Gas em gwei: 46844
- Ether: 0.000046844
- Dolar: $0.19
- json input: {"0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2", "100"}
TransferFrom Para eu ter permissao para usar esse método, primeiramente preciso do allowance {"0x5B38Da6a701c568545dCfcB03FcB875f56beddC4", "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2", "100"} - Reason provided by the contract: "ERC20: transfer amount exceeds allowance".

Transferindo 10 tokens para a conta ...2148, onde o owner desse token é a conta ...ddC4, mas ...ddC4 deu permissão para o caller(executor do contrato) ...5cb2
- Valor da Transação
- Gas em gwei: 60430
- Ether: 0.000060430
- Dolar: $0.24
- json input: {"0x5B38Da6a701c568545dCfcB03FcB875f56beddC4", "0xdD870fA1b7C4700F2BD7f44238821C26f7392148", "10"}
Allowance - Consultar a qtde de tokens com permissao ainda
- json input: {"0x5B38Da6a701c568545dCfcB03FcB875f56beddC4", "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2"}
Increase Allowance - Aumentar a qtde de tokens para serem distribuídos
- Valor da Transação
- Gas em gwei: 30151
- Ether: 0.000030151
- Dolar: $0.12
- json input: {"0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2","20"}
Decrease Allowance - Remove a qtde de tokens para serem distribuídos
- Valor da Transação
- Gas em gwei: 30046
- Ether: 0.000030046
- Dolar: $0.12
- json input: {"0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2","10"}

Integração interface

Institution1
- ID: 0x38613433646330372d633664662d343839332d613761632d3132326235636536
- address: 0xb79932D16B4bd12044936b6875DCE08F0a53Fa82
Institution2
- ID: 0x37636537343036342d343462302d313165632d383164332d3032343261633133
- address: 0xe7337F7b470daA4D219269Cf777e8B06c9270927
Aluno
- address: 0xb7Eb8BcE73F9c7006c9b8DCE72599aC37469bFc6

Obsevações

Estudar

Waffle, and Hardhat

nlsjr / chalk