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Simplify asset-transfer-basic javascript application (#241)

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* Improve asset-transfer-basic javascript app code by combining invoke & query.js

Adding a sample application workflow to demonstrate the chaincodes, similar to the WIP PR for basic go-application (https://github.com/hyperledger/fabric-samples/pull/211).
Simplify and document-in-code the app workflow of this sample, in a single app , instead of invoke & query setting up Gateway

Signed-off-by: Sijo Cherian <sijo@ibm.com>

improve javascript app code by combining invoke & query.js

Signed-off-by: Sijo Cherian <sijo@ibm.com>

reverted chaincode func signature

Signed-off-by: Sijo Cherian <sijo@ibm.com>

* create/updateAsset signature in sync with chaincode func change as in #227

Signed-off-by: Sijo Cherian <sijo@ibm.com>

* Tested with latest chaincode, Improved comments

Signed-off-by: Sijo Cherian <sijo@ibm.com>

Co-authored-by: Sijo Cherian <sijo@ibm.com>
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131
asset-transfer-basic/application-javascript/app.js Normal file
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@ -0,0 +1,131 @@
/*
* Copyright IBM Corp. All Rights Reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
'use strict';
const { Gateway, Wallets } = require('fabric-network');
const path = require('path');
const fs = require('fs');
const registerUser = require('./registerUser');
const enrollAdmin = require('./enrollAdmin');
const myChannel = 'mychannel';
const myChaincodeName = 'basic';
function prettyJSONString(inputString) {
return JSON.stringify(JSON.parse(inputString),null,2);
}
// pre-requisites:
// fabric-sample test-network setup with two peers and an ordering service,
// the companion chaincode is deployed, approved and committed on the channel mychannel
async function main() {
try {
// load the network configuration
const ccpPath = path.resolve(__dirname, '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com', 'connection-org1.json');
const fileExists = fs.existsSync(ccpPath);
if (!fileExists) {
throw new Error(`no such file or directory: ${ccpPath}`);
}
const ccp = JSON.parse(fs.readFileSync(ccpPath, 'utf8'));
// Create a new file system based wallet for managing identities.
const walletPath = path.join(__dirname, 'wallet');
const wallet = await Wallets.newFileSystemWallet(walletPath);
console.log(`Wallet path: ${walletPath}`);
// Steps:
// Note: Steps 1 & 2 need to done only once in an app-server per blockchain network
// 1. register & enroll admin user with CA, stores admin identity in local wallet
enrollAdmin.EnrollAdminUser();
// 2. register & enroll application user with CA, which is used as client identify to make chaincode calls, stores app user identity in local wallet
registerUser.RegisterAppUser();
// Check to see if app user exist in wallet.
const identity = await wallet.get(registerUser.ApplicationUserId);
if (!identity) {
console.log('An identity for the user does not exist in the wallet: '+ registerUser.ApplicationUserId);
return;
}
//3. Prepare to call chaincode using fabric javascript node sdk
// Create a new gateway for connecting to our peer node.
const gateway = new Gateway();
await gateway.connect(ccp, { wallet, identity: registerUser.ApplicationUserId, discovery: { enabled: true, asLocalhost: true } });
try {
// Get the network (channel) our contract is deployed to.
const network = await gateway.getNetwork(myChannel);
// Get the contract from the network.
const contract = network.getContract(myChaincodeName);
//4. Init a set of asset data on the channel using chaincode 'InitLedger'
console.log('Submit Transaction: InitLedger creates the initial set of assets on the ledger.');
await contract.submitTransaction('InitLedger');
//5. *** Some example transactions are listed below ***
// GetAllAssets returns all the current assets on the ledger
let result = await contract.evaluateTransaction('GetAllAssets');
console.log('Evaluate Transaction: GetAllAssets, result: ' + prettyJSONString(result.toString()) );
console.log('\n***********************');
console.log('Submit Transaction: CreateAsset asset13');
//CreateAsset creates an asset with ID asset13, color yellow, owner Tom, size 5 and appraizedValue of 1300
await contract.submitTransaction('CreateAsset', 'asset13', 'yellow', 5, 'Tom', 1300);
console.log('Evaluate Transaction: ReadAsset asset13');
// ReadAsset returns an asset with given assetID
result = await contract.evaluateTransaction('ReadAsset', 'asset13');
console.log(' result: ' + prettyJSONString(result.toString()) );
console.log('\n***********************');
console.log('Evaluate Transaction: AssetExists asset1');
// AssetExists returns 'true' if an asset with given assetID exist
result = await contract.evaluateTransaction('AssetExists', 'asset1');
console.log(' result: ' + prettyJSONString(result.toString()) );
console.log('Submit Transaction: UpdateAsset asset1, new AppraisedValue : 350');
// UpdateAsset updates an existing asset with new properties. Same args as CreateAsset
await contract.submitTransaction('UpdateAsset', 'asset1', 'blue', 5, 'Tomoko', 350);
console.log('Evaluate Transaction: ReadAsset asset1');
result = await contract.evaluateTransaction('ReadAsset', 'asset1');
console.log(' result: ' + prettyJSONString(result.toString()) );
try {
console.log('\nSubmit Transaction: UpdateAsset asset70');
//Non existing asset asset70 should throw Error
await contract.submitTransaction('UpdateAsset', 'asset70', 'blue', 5, 'Tomoko', 300);
}
catch (error) {
let errMsg = 'Expected an error on UpdateAsset of non-existing Asset. ';
console.log(errMsg + error);
}
console.log('\n***********************');
console.log('Submit Transaction: TransferAsset asset1 from owner Tomoko > owner Tom');
// TransferAsset transfers an asset with given ID to new owner Tom
await contract.submitTransaction('TransferAsset', 'asset1', 'Tom');
console.log('Evaluate Transaction: ReadAsset asset1');
result = await contract.evaluateTransaction('ReadAsset', 'asset1');
console.log(' result: ' + prettyJSONString(result.toString()) );
} finally {
// Disconnect from the gateway peer when all work for this client identity is complete
gateway.disconnect();
}
} catch (error) {
console.error(`Failed to evaluate transaction: ${error}`);
process.exit(1);
}
}
main();

24
asset-transfer-basic/application-javascript/enrollAdmin.js
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@ -10,8 +10,11 @@ const FabricCAServices = require('fabric-ca-client');
const { Wallets } = require('fabric-network');
const fs = require('fs');
const path = require('path');
const adminUserId = 'admin';
const adminUserPasswd = 'adminpw';
const walletPath = path.join(__dirname, 'wallet');
async function main() {
async function enrollAdminUser() {
try {
// load the network configuration
const ccpPath = path.resolve(__dirname, '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com', 'connection-org1.json');
@ -26,20 +29,18 @@ async function main() {
const caTLSCACerts = caInfo.tlsCACerts.pem;
const ca = new FabricCAServices(caInfo.url, { trustedRoots: caTLSCACerts, verify: false }, caInfo.caName);
// Create a new file system based wallet for managing identities.
const walletPath = path.join(__dirname, 'wallet');
// Create a new wallet : Note that wallet can be resfor managing identities.
const wallet = await Wallets.newFileSystemWallet(walletPath);
console.log(`Wallet path: ${walletPath}`);
// Check to see if we've already enrolled the admin user.
const identity = await wallet.get('admin');
const identity = await wallet.get(adminUserId);
if (identity) {
console.log('An identity for the admin user "admin" already exists in the wallet');
console.log('An identity for the admin user already exists in the wallet');
return;
}
// Enroll the admin user, and import the new identity into the wallet.
const enrollment = await ca.enroll({ enrollmentID: 'admin', enrollmentSecret: 'adminpw' });
const enrollment = await ca.enroll({ enrollmentID: adminUserId, enrollmentSecret: adminUserPasswd });
const x509Identity = {
credentials: {
certificate: enrollment.certificate,
@ -48,13 +49,14 @@ async function main() {
mspId: 'Org1MSP',
type: 'X.509',
};
await wallet.put('admin', x509Identity);
console.log('Successfully enrolled admin user "admin" and imported it into the wallet');
await wallet.put(adminUserId, x509Identity);
console.log('Successfully enrolled admin user and imported it into the wallet');
} catch (error) {
console.error(`Failed to enroll admin user "admin": ${error}`);
console.error(`Failed to enroll admin user : ${error}`);
process.exit(1);
}
}
main();
exports.AdminUserId = adminUserId;
exports.EnrollAdminUser = enrollAdminUser;

63
asset-transfer-basic/application-javascript/invoke.js
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@ -1,63 +0,0 @@
/*
* Copyright IBM Corp. All Rights Reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
'use strict';
const { Gateway, Wallets } = require('fabric-network');
const fs = require('fs');
const path = require('path');
async function main() {
try {
// load the network configuration
const ccpPath = path.resolve(__dirname, '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com', 'connection-org1.json');
const fileExists = fs.existsSync(ccpPath);
if (!fileExists) {
throw new Error(`no such file or directory: ${ccpPath}`);
}
let ccp = JSON.parse(fs.readFileSync(ccpPath, 'utf8'));
// Create a new file system based wallet for managing identities.
const walletPath = path.join(__dirname, 'wallet');
const wallet = await Wallets.newFileSystemWallet(walletPath);
console.log(`Wallet path: ${walletPath}`);
// Check to see if we've already enrolled the user.
const identity = await wallet.get('appUser');
if (!identity) {
console.log('An identity for the user "appUser" does not exist in the wallet');
console.log('Run the registerUser.js application before retrying');
return;
}
// Create a new gateway for connecting to our peer node.
const gateway = new Gateway();
await gateway.connect(ccp, { wallet, identity: 'appUser', discovery: { enabled: true, asLocalhost: true } });
// Get the network (channel) our contract is deployed to.
const network = await gateway.getNetwork('mychannel');
// Get the contract from the network.
const contract = network.getContract('basic');
// Submit the specified transaction. (several example transactions are listed below)
// createAsset creates an asset with ID asset1, color yellow, owner Dave, size 5 and appraizedValue of 130 requires 6 arguments.
// ex: ('createAsset', 'asset1', 'yellow', 'Dave', 5, 1300)
// transferAsset transfers an asset with ID asset1 to new owner Tom - requires 2 arguments.
// ex: ('transferAsset', 'asset1', 'Tom')
await contract.submitTransaction('createAsset', 'asset13', 'yellow', 5, 'Tom', 1300);
console.log('Transaction has been submitted');
// Disconnect from the gateway.
await gateway.disconnect();
} catch (error) {
console.error(`Failed to submit transaction: ${error}`);
process.exit(1);
}
}
main();

64
asset-transfer-basic/application-javascript/query.js
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@ -1,64 +0,0 @@
/*
* Copyright IBM Corp. All Rights Reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
'use strict';
const { Gateway, Wallets } = require('fabric-network');
const path = require('path');
const fs = require('fs');
async function main() {
try {
// load the network configuration
const ccpPath = path.resolve(__dirname, '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com', 'connection-org1.json');
const fileExists = fs.existsSync(ccpPath);
if (!fileExists) {
throw new Error(`no such file or directory: ${ccpPath}`);
}
const ccp = JSON.parse(fs.readFileSync(ccpPath, 'utf8'));
// Create a new file system based wallet for managing identities.
const walletPath = path.join(__dirname, 'wallet');
const wallet = await Wallets.newFileSystemWallet(walletPath);
console.log(`Wallet path: ${walletPath}`);
// Check to see if we've already enrolled the user.
const identity = await wallet.get('appUser');
if (!identity) {
console.log('An identity for the user "appUser" does not exist in the wallet');
console.log('Run the registerUser.js application before retrying');
return;
}
// Create a new gateway for connecting to our peer node.
const gateway = new Gateway();
await gateway.connect(ccp, { wallet, identity: 'appUser', discovery: { enabled: true, asLocalhost: true } });
// Get the network (channel) our contract is deployed to.
const network = await gateway.getNetwork('mychannel');
// Get the contract from the network.
const contract = network.getContract('basic');
// Evaluate the specified transaction. (several example transactions are listed below)
// getAsset returns an asset with given assetID asset4 - requires 1 argument.
// ex: ('getAsset', 'asset4')
// getAllAssets returns all assets in the world state - requires no arguments.
// ex: ('getAllAssets')
const result = await contract.evaluateTransaction('getAllAssets');
console.log(`Transaction has been evaluated, result is: ${result.toString()}`);
// Disconnect from the gateway.
await gateway.disconnect();
} catch (error) {
console.error(`Failed to evaluate transaction: ${error}`);
process.exit(1);
}
}
main();

36
asset-transfer-basic/application-javascript/registerUser.js
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@ -10,8 +10,12 @@ const { Wallets } = require('fabric-network');
const FabricCAServices = require('fabric-ca-client');
const fs = require('fs');
const path = require('path');
const enrollAdmin = require('./enrollAdmin');
const caChaincodeUserRole = 'client';
const applicationUserId = 'appUser';
const walletPath = path.join(__dirname, 'wallet');
async function main() {
async function registerAppUser() {
try {
// load the network configuration
const ccpPath = path.resolve(__dirname, '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com', 'connection-org1.json');
@ -25,38 +29,37 @@ async function main() {
const caURL = ccp.certificateAuthorities['ca.org1.example.com'].url;
const ca = new FabricCAServices(caURL);
// Create a new file system based wallet for managing identities.
const walletPath = path.join(__dirname, 'wallet');
// Create a new file system based wallet for managing identities. ;
const wallet = await Wallets.newFileSystemWallet(walletPath);
console.log(`Wallet path: ${walletPath}`);
// Check to see if we've already enrolled the user.
const userIdentity = await wallet.get('appUser');
const userIdentity = await wallet.get(applicationUserId);
if (userIdentity) {
console.log('An identity for the user "appUser" already exists in the wallet');
console.log('An identity for the user '+applicationUserId+' already exists in the wallet');
return;
}
// Check to see if we've already enrolled the admin user.
const adminIdentity = await wallet.get('admin');
const adminIdentity = await wallet.get(enrollAdmin.AdminUserId);
if (!adminIdentity) {
console.log('An identity for the admin user "admin" does not exist in the wallet');
console.log('An identity for the admin user does not exist in the wallet');
console.log('Run the enrollAdmin.js application before retrying');
return;
}
// build a user object for authenticating with the CA
const provider = wallet.getProviderRegistry().getProvider(adminIdentity.type);
const adminUser = await provider.getUserContext(adminIdentity, 'admin');
const adminUser = await provider.getUserContext(adminIdentity, enrollAdmin.AdminUserId);
// Register the user, enroll the user, and import the new identity into the wallet.
// if affiliation is specified by client, the affiliation value must be configured in CA
const secret = await ca.register({
affiliation: 'org1.department1',
enrollmentID: 'appUser',
role: 'client'
enrollmentID: applicationUserId,
role: caChaincodeUserRole
}, adminUser);
const enrollment = await ca.enroll({
enrollmentID: 'appUser',
enrollmentID: applicationUserId,
enrollmentSecret: secret
});
const x509Identity = {
@ -67,13 +70,14 @@ async function main() {
mspId: 'Org1MSP',
type: 'X.509',
};
await wallet.put('appUser', x509Identity);
console.log('Successfully registered and enrolled admin user "appUser" and imported it into the wallet');
await wallet.put(applicationUserId, x509Identity);
console.log('Successfully registered and enrolled user '+applicationUserId +' and imported it into the wallet');
} catch (error) {
console.error(`Failed to register user "appUser": ${error}`);
console.error(`Failed to register user : ${error}`);
process.exit(1);
}
}
main();
exports.ApplicationUserId = applicationUserId;
exports.RegisterAppUser = registerAppUser;