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'use strict';
const { Contract } = require('fabric-contract-api');
class FabCar extends Contract {
async initLedger(ctx) {
console.info('============= START : Initialize Ledger ===========');
const cars = [
{
color: 'blue',
make: 'Toyota',
model: 'Prius',
owner: 'Tomoko',
},
{
color: 'red',
make: 'Ford',
model: 'Mustang',
owner: 'Brad',
},
{
color: 'green',
make: 'Hyundai',
model: 'Tucson',
owner: 'Jin Soo',
},
{
color: 'yellow',
make: 'Volkswagen',
model: 'Passat',
owner: 'Max',
},
{
color: 'black',
make: 'Tesla',
model: 'S',
owner: 'Adriana',
},
{
color: 'purple',
make: 'Peugeot',
model: '205',
owner: 'Michel',
},
{
color: 'white',
make: 'Chery',
model: 'S22L',
owner: 'Aarav',
},
{
color: 'violet',
make: 'Fiat',
model: 'Punto',
owner: 'Pari',
},
{
color: 'indigo',
make: 'Tata',
model: 'Nano',
owner: 'Valeria',
},
{
color: 'brown',
make: 'Holden',
model: 'Barina',
owner: 'Shotaro',
},
];
for (let i = 0; i < cars.length; i++) {
cars[i].docType = 'car';
await ctx.stub.putState('CAR' + i, Buffer.from(JSON.stringify(cars[i])));
console.info('Added <--> ', cars[i]);
}
console.info('============= END : Initialize Ledger ===========');
}
async queryCar(ctx, carNumber) {
const carAsBytes = await ctx.stub.getState(carNumber);
if (!carAsBytes || carAsBytes.length === 0) {
throw new Error(`${carNumber} does not exist`);
}
console.log(carAsBytes.toString());
return carAsBytes.toString();
}
async createCar(ctx, carNumber, make, model, color, owner) {
console.info('============= START : Create Car ===========');
const car = {
color,
docType: 'car',
make,
model,
owner,
};
await ctx.stub.putState(carNumber, Buffer.from(JSON.stringify(car)));
console.info('============= END : Create Car ===========');
}
async queryAllCars(ctx) {
const startKey = 'CAR0';
const endKey = 'CAR999';
const allResults = [];
for await (const {key, value} of ctx.stub.getStateByRange(startKey, endKey)) {
const strValue = Buffer.from(value).toString('utf8');
let record;
try {
record = JSON.parse(strValue);
} catch (err) {
console.log(err);
record = strValue;
}
allResults.push({ Key: key, Record: record });
}
console.info(allResults);
return JSON.stringify(allResults);
}
async changeCarOwner(ctx, carNumber, newOwner) {
console.info('============= START : changeCarOwner ===========');
const carAsBytes = await ctx.stub.getState(carNumber);
if (!carAsBytes || carAsBytes.length === 0) {
throw new Error(`${carNumber} does not exist`);
}
const car = JSON.parse(carAsBytes.toString());
car.owner = newOwner;
await ctx.stub.putState(carNumber, Buffer.from(JSON.stringify(car)));
console.info('============= END : changeCarOwner ===========');
}
}
module.exports = FabCar;
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