code-2.js

code-2.js

import uuidv4 from 'uuid/v4';
// import { performance } from 'perf_hooks';
import { generateCodigo } from '../utils';
import { usarCodigoSchema } from '../models/codigo';

//  { descend into nested schema, return on first error, remove unspecified keys from objects }
const validationOptions = { recursive: true, abortEarly: true, stripUnknown: true };

// [...]

export const usarCodigo = async (stub, args) => {
  let data;
  let formattedData;

  // 1. Parses JSON stringified request
  try {
    data = JSON.parse(args.toString());
  } catch (err) {
    throw new Error('Não foi possivel decodificar o JSON, por favor verifique o formato');
  }

  console.info('--- start usarCodigo ---');

  // 2. Verifies Object format
  try {
    formattedData = await usarCodigoSchema.validate(data, validationOptions);
  } catch (err) {
    // log yup validation errors
    console.log(err);
    throw new Error(err.message);
  }

  const dataAsBytes = await stub.getState(data.id);

  // 3. Verifies if data already exist
  if (!dataAsBytes.toString()) {
    throw new Error(`codigo "${data.id}" nao encontrado`);
  }

  // 4. Parses data that will be updated
  const dataToUpdate = JSON.parse(dataAsBytes.toString());
  // Verify if codigo was not already used
  if (dataToUpdate.usado) {
    throw new Error(`codigo "${data.id}" ja usado`);
  }

  // 5. Merges formatted data
  const updatedData = { ...dataToUpdate, ...formattedData };

  // 6. Transforms the JSON data into Bytes data 
  const updatedDataAsBytes = Buffer.from(JSON.stringify(updatedData));
  
  // 7. Pushes updated data into the ledger
  await stub.putState(updatedData.id, updatedDataAsBytes);
  
  // 8. Creates event
  stub.setEvent('codigoUsado', updatedDataAsBytes);
  console.info('==================');
  console.log(updatedData);
  console.info('==================');
  console.info('--- usarCodigo ---');
};