fabric-samples/asset-transfer-basic/application-javascript/app.js

/*
 * Copyright IBM Corp. All Rights Reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

'use strict';

const {Gateway, Wallets} = require('fabric-network');
const FabricCAServices = require('fabric-ca-client');
const path = require('path');
const {buildCAClient, registerUser, enrollAdmin} = require('../../test-application/javascript/CAUtil.js');
const {buildCCP, buildWallet} = require('../../test-application/javascript/AppUtil.js');

const channelName = 'mychannel';
const chaincodeName = 'basic';
const walletPath = path.join(__dirname, 'wallet');
const userId = 'appUser';

function prettyJSONString(inputString) {
	return JSON.stringify(JSON.parse(inputString), null, 2);
}

// pre-requisites:
// - fabric-sample two organization test-network setup with two peers, ordering service, and 2 certificate authorities
//         ===> from directory /fabric-samples/test-network
//         network.sh run createChannel -ca
// - any of the asset-transfer-basic chaincodes deployed on the channel "mychannel" with the chaincodeName of "basic"
//   This deploy command will package, install, approve, and commit the javascript chaincode, all the actions it takes
//   to deploy a chaincode to a channel.
//         ===> from directory /fabric-samples/test-network
//         network.sh deployCC -ccn basic -ccl javascript
// - node install
// - npm installed code dependencies
//         ===> from directory /fabric-samples/asset-transfer-basic/application-javascript
//         npm install
// - to run this test application
//         ===> from directory /fabric-samples/asset-transfer-basic/application-javascript
//         node app.js
//               # this may be run again again

/**
 *  A test application to show basic operations with any of the asset-transfer-basic chaincodes
 *   -- How to submit a transaction
 *   -- How to query and check the results
 *
 * To see the SDK workings, try setting the logging to show on the console before running
 *        export HFC_LOGGING='{"debug":"console"}'
 */
async function main() {
	try {
		// build an in memory object with the network configuration (also known as a connection profile)
		const ccp = buildCCP();

		// build an instance of the fabric ca services client based on
		// the information in the network configuration
		const caClient = buildCAClient(FabricCAServices, ccp);

		// setup the wallet to hold the credentials of the application user
		const wallet = await buildWallet(Wallets, walletPath);

		// in a real application this would be done on an administrative flow, and only once
		await enrollAdmin(caClient, wallet);

		// in a real application this would be done only when a new user was required to be added
		// and would be part of an administrative flow
		await registerUser(caClient, wallet, userId, 'org1.department1');

		// Create a new gateway instance for interacting with the fabric network.
		// In a real application this would be done as the backend server session is setup for
		// a user that has been verified.
		const gateway = new Gateway();

		try {
			// setup the gateway instance
			// The user will now be able to create connections to the fabric network and be able to
			// submit transactions and query. All transactions submitted by this gateway will be
			// signed by this user using the credentials stored in the wallet.
			await gateway.connect(ccp, {
				wallet,
				identity: userId,
				discovery: {enabled: true, asLocalhost: true} // using asLocalhost as this gateway is using a fabric network deployed locally
			});

			// Build a network instance based on the channel where the smart contract is deployed
			const network = await gateway.getNetwork(channelName);

			// Get the contract from the network.
			const contract = network.getContract(chaincodeName);

			// Initialize a set of asset data on the channel using the chaincode 'InitLedger' function.
			// This type of transaction would only be run once by an application the first time it was started after it
			// deployed the first time. Any updates to the chaincode deployed later would likely not need to run
			// an "init" type function.
			console.log('\n--> Submit Transaction: InitLedger, function creates the initial set of assets on the ledger');
			await contract.submitTransaction('InitLedger');
			console.log('*** Result: committed');

			// Let's try a query type operation (function).
			// This will be sent to just one peer and the results will be shown.
			console.log('\n--> Evaluate Transaction: GetAllAssets, function returns all the current assets on the ledger');
			let result = await contract.evaluateTransaction('GetAllAssets');
			console.log(`*** Result: ${prettyJSONString(result.toString())}`);

			// Now let's try to submit a transaction.
			// This will be sent to both peers and if both peers endorse the transaction, the endorsed proposal will be sent
			// to the orderer to be committed by each of the peer's to the channel ledger.
			console.log('\n--> Submit Transaction: CreateAsset, creates new asset with ID, color, owner, size, and appraisedValue arguments');
			await contract.submitTransaction('CreateAsset', 'asset13', 'yellow', '5', 'Tom', '1300');
			console.log('*** Result: committed');

			console.log('\n--> Evaluate Transaction: ReadAsset, function returns an asset with a given assetID');
			result = await contract.evaluateTransaction('ReadAsset', 'asset13');
			console.log(`*** Result: ${prettyJSONString(result.toString())}`);

			console.log('\n--> Evaluate Transaction: AssetExists, function returns "true" if an asset with given assetID exist');
			result = await contract.evaluateTransaction('AssetExists', 'asset1');
			console.log(`*** Result: ${prettyJSONString(result.toString())}`);

			console.log('\n--> Submit Transaction: UpdateAsset asset1, change the appraisedValue to 350');
			await contract.submitTransaction('UpdateAsset', 'asset1', 'blue', '5', 'Tomoko', '350');
			console.log('*** Result: committed');

			console.log('\n--> Evaluate Transaction: ReadAsset, function returns "asset1" attributes');
			result = await contract.evaluateTransaction('ReadAsset', 'asset1');
			console.log(`*** Result: ${prettyJSONString(result.toString())}`);

			try {
				// How about we try a transactions where the executing chaincode throws an error
				// Notice how the submitTransaction will throw an error containing the error thrown by the chaincode
				console.log('\n--> Submit Transaction: UpdateAsset asset70, asset70 does not exist and should return an error');
				await contract.submitTransaction('UpdateAsset', 'asset70', 'blue', '5', 'Tomoko', '300');
				console.log('******** FAILED to return an error');
			} catch (error) {
				console.log(`*** Successfully caught the error: \n    ${error}`);
			}

			console.log('\n--> Submit Transaction: TransferAsset asset1, transfer to new owner of Tom');
			await contract.submitTransaction('TransferAsset', 'asset1', 'Tom');
			console.log('*** Result: committed');

			console.log('\n--> Evaluate Transaction: ReadAsset, function returns "asset1" attributes');
			result = await contract.evaluateTransaction('ReadAsset', 'asset1');
			console.log(`*** Result: ${prettyJSONString(result.toString())}`);
		} finally {
			// Disconnect from the gateway when the application is closing
			// This will close all connections to the network
			gateway.disconnect();
		}
	} catch (error) {
		console.error(`******** FAILED to run the application: ${error}`);
	}
}

main();