Asset-Transfer-Events Migration to Use Fabric-Gateway (#565)

* Gateway Migration for events application

Signed-off-by: sapthasurendran <saptha.surendran@ibm.com>

* Documentation Error Fix

Signed-off-by: sapthasurendran <saptha.surendran@ibm.com>

* Updated ci pipelines to include the app
Readme update
Wait for events to complete
Refactor code for events replay
Signed-off-by: sapthasurendran <saptha.surendran@ibm.com>

asset-transfer-events/README.md

@@ -43,12 +43,12 @@ Note that the asset transfer implemented by the smart contract is a simplified s
 Like other samples, the Fabric test network is used to deploy and run this sample. Follow these steps in order:
 
 1. Create the test network and a channel (from the `test-network` folder).
-   ``` 
+   ```
    ./network.sh up createChannel -c mychannel -ca
    ```
 
 1. Deploy one of the smart contract implementations (from the `test-network` folder).
-   ``` 
+   ```
    # To deploy the JavaScript chaincode implementation
    ./network.sh deployCC -ccn events -ccp ../asset-transfer-events/chaincode-javascript/ -ccl javascript -ccep "OR('Org1MSP.peer','Org2MSP.peer')"
 
@@ -61,6 +61,11 @@ Like other samples, the Fabric test network is used to deploy and run this sampl
    # To run the Go sample application
    cd application-gateway-go
    go run .
+
+   # To run the Typescript sample application
+   cd application-gateway-typescript
+   npm install
+   npm start
    ```
 
 ## Clean up
@@ -69,4 +74,4 @@ When you are finished, you can bring down the test network (from the `test-netwo
 
 ```
 ./network.sh down
-```
+```

asset-transfer-events/application-gateway-typescript/.eslintrc.json

@@ -0,0 +1,45 @@
+{
+    "env": {
+      "node": true,
+      "es6": true
+    },
+    "root": true,
+    "ignorePatterns": [
+      "dist/"
+    ],
+    "extends": [
+      "eslint:recommended"
+    ],
+    "rules": {
+      "indent": [
+        "error",
+        4
+      ],
+      "quotes": [
+        "error",
+        "single"
+      ]
+    },
+    "overrides": [
+      {
+        "files": [
+          "**/*.ts"
+        ],
+        "parser": "@typescript-eslint/parser",
+        "parserOptions": {
+          "sourceType": "module",
+          "ecmaFeatures": {
+            "impliedStrict": true
+          }
+        },
+        "plugins": [
+          "@typescript-eslint"
+        ],
+        "extends": [
+          "eslint:recommended",
+          "plugin:@typescript-eslint/eslint-recommended",
+          "plugin:@typescript-eslint/recommended"
+        ]
+      }
+    ]
+  }

asset-transfer-events/application-gateway-typescript/.gitignore

@@ -0,0 +1,14 @@
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Compiled TypeScript files
+dist

asset-transfer-events/application-gateway-typescript/package.json

@@ -0,0 +1,32 @@
+{
+    "name": "asset-transfer-basic",
+    "version": "1.0.0",
+    "description": "Asset Transfer Basic Application implemented in typeScript using fabric-gateway",
+    "main": "dist/index.js",
+    "typings": "dist/index.d.ts",
+    "engines": {
+        "node": ">=14"
+    },
+    "scripts": {
+        "build": "tsc",
+        "build:watch": "tsc -w",
+        "lint": "eslint . --ext .ts",
+        "prepare": "npm run build",
+        "pretest": "npm run lint",
+        "start": "node dist/app.js"
+    },
+    "engineStrict": true,
+    "author": "Hyperledger",
+    "license": "Apache-2.0",
+    "dependencies": {
+        "@grpc/grpc-js": "^1.5.0",
+        "@hyperledger/fabric-gateway": "^1.0.0"
+    },
+    "devDependencies": {
+        "@tsconfig/node14": "^1.0.1",
+        "@typescript-eslint/eslint-plugin": "^5.6.0",
+        "@typescript-eslint/parser": "^5.6.0",
+        "eslint": "^8.4.1",
+        "typescript": "~4.5.2"
+    }
+}

asset-transfer-events/application-gateway-typescript/src/app.ts

@@ -0,0 +1,184 @@
+/*
+ * Copyright IBM Corp. All Rights Reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as grpc from '@grpc/grpc-js';
+import { ChaincodeEvent, CloseableAsyncIterable, connect, Contract, GatewayError, Network } from '@hyperledger/fabric-gateway';
+import { TextDecoder } from 'util';
+
+import { newGrpcConnection, newIdentity, newSigner } from './connect';
+
+const channelName = 'mychannel';
+const chaincodeName = 'events';
+
+const utf8Decoder = new TextDecoder();
+const now = Date.now();
+const assetId = `asset${now}`;
+
+
+async function main(): Promise<void> {
+    // The gRPC client connection should be shared by all Gateway connections to this endpoint.
+    const client = await newGrpcConnection();
+
+    const gateway = connect({
+        client,
+        identity: await newIdentity(),
+        signer: await newSigner(),
+        evaluateOptions: () => {
+            return { deadline: Date.now() + 5000 }; // 5 seconds
+        },
+        endorseOptions: () => {
+            return { deadline: Date.now() + 15000 }; // 15 seconds
+        },
+        submitOptions: () => {
+            return { deadline: Date.now() + 5000 }; // 5 seconds
+        },
+        commitStatusOptions: () => {
+            return { deadline: Date.now() + 60000 }; // 1 minute
+        },
+    });
+
+    let events: CloseableAsyncIterable<ChaincodeEvent> | undefined;
+
+    try {
+        // Get a network instance representing the channel where the smart contract is deployed.
+        const network = gateway.getNetwork(channelName);
+
+        // Get the smart contract from the network.
+        const contract = network.getContract(chaincodeName);
+
+        //Start Listening to events.
+        events = await startEventListening(network);
+
+        // Create a new asset on the ledger.
+        const firstBlockNumber = await createAsset(contract);
+
+        // Update an existing asset.
+        await updateAsset(contract)
+
+        // Transfer an existing asset.
+        await transferAsset(contract);
+
+        // Delete asset by assetID.
+        await deleteAssetByID(contract);
+
+        // Replay all the events received.
+        await replayChaincodeEvents(network,firstBlockNumber)
+
+    } finally {
+        events?.close();
+        gateway.close();
+        client.close();
+    }
+}
+
+main().catch(error => {
+    console.error('******** FAILED to run the application:', error);
+    process.exitCode = 1;
+});
+
+/**
+ * Start listening to events.
+ */
+async function startEventListening(network: Network): Promise<CloseableAsyncIterable<ChaincodeEvent>> {
+    console.log('\n*** Start chaincode event listening\n');
+
+    const events = await network.getChaincodeEvents(chaincodeName);
+
+    readEvents(events);
+    return events;
+}
+
+/**
+ * Read events.
+ */
+async function readEvents(events: CloseableAsyncIterable<ChaincodeEvent>): Promise<void> {
+    try {
+        for await (const event of events) {
+            const payload = utf8Decoder.decode(event.payload);
+            console.log(`\n<-- Chaincode event received, name: ${event.eventName}, payload: ${payload}, txID: ${event.transactionId}, blockNumber:${event.blockNumber}`);
+        }
+    } catch (error: unknown) {
+        if (!(error instanceof GatewayError) || error.code !== grpc.status.CANCELLED) {
+            throw error;
+        }
+    }
+}
+
+/**
+ * Submit a transaction asynchronously to create a new asset.
+ */
+async function createAsset(contract: Contract): Promise<bigint> {
+    console.log(`\n --> Submit Transaction: CreateAsset, creates ${assetId} owned by Tom with appraised value 100`);
+
+    const result = await contract.submitAsync('CreateAsset',
+        {arguments: [assetId,'yellow','5','Tom','100',]});
+
+    const status = await result.getStatus();
+    if (!status.successful) {
+        throw new Error(`failed to commit transaction ${status.transactionId} with status code ${status.code}`);
+    }
+
+    console.log('\n*** CreateAsset committed successfully\n')
+
+    return status.blockNumber;
+}
+/**
+ * Submit transaction synchronously, to updateAsset the asset appraised value.
+ */
+async function updateAsset(contract: Contract): Promise<void> {
+    console.log(`\n--> Submit transaction: UpdateAsset, ${assetId} update appraised value to 200`);
+
+    await contract.submitTransaction('UpdateAsset',
+        assetId,'yellow','5','Tom','200',);
+
+    console.log('\n*** UpdateAsset committed successfully\n')
+}
+
+/**
+ * Submit transaction synchronously, to transfer the asset.
+ */
+async function transferAsset(contract: Contract): Promise<void> {
+    console.log(`\n--> Submit transaction: TransferAsset, ${assetId} to Saptha\n`);
+
+    await contract.submitTransaction('TransferAsset',
+        assetId, 'Saptha',);
+
+    console.log('\n*** TransferAsset committed successfully\n')
+}
+
+/**
+ * Submit a transaction synchronously to delete an asset by ID.
+ */
+async function deleteAssetByID(contract:Contract): Promise<void>{
+    console.log(`\n--> Submit transaction: DeleteAsset ${assetId}`);
+
+    await contract.submitTransaction('DeleteAsset',
+        assetId
+    );
+
+    console.log('\n*** DeleteAsset committed successfully\n')
+}
+
+/**
+  * Replay all the events from the start block.
+  */
+async function replayChaincodeEvents(network:Network,startBlock:bigint):Promise<void>{
+
+    const events = await network.getChaincodeEvents(chaincodeName, {
+        startBlock
+    });
+    try {
+        for await (const event of events) {
+            const payload = utf8Decoder.decode(event.payload);
+            console.log(`<-- Chaincode event replayed: ${event.eventName}, payload: ${payload}`);
+            if(event.eventName === 'DeleteAsset'){
+                break
+            }
+        }
+    }finally {
+        events.close()
+    }
+}

asset-transfer-events/application-gateway-typescript/src/connect.ts

@@ -0,0 +1,49 @@
+/*
+ * Copyright IBM Corp. All Rights Reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as grpc from '@grpc/grpc-js';
+import {  Identity,  Signer, signers } from '@hyperledger/fabric-gateway';
+import * as crypto from 'crypto';
+import { promises as fs } from 'fs';
+import * as path from 'path';
+
+const mspId = 'Org1MSP';
+
+// Path to crypto materials.
+const cryptoPath = path.resolve(__dirname, '..', '..', '..', 'test-network', 'organizations', 'peerOrganizations', 'org1.example.com');
+
+// Path to user private key directory.
+const keyDirectoryPath = path.resolve(cryptoPath, 'users', 'User1@org1.example.com', 'msp', 'keystore');
+
+// Path to user certificate.
+const certPath = path.resolve(cryptoPath, 'users', 'User1@org1.example.com', 'msp', 'signcerts', 'cert.pem');
+
+// Path to peer tls certificate.
+const tlsCertPath = path.resolve(cryptoPath, 'peers', 'peer0.org1.example.com', 'tls', 'ca.crt');
+
+// Gateway peer endpoint.
+const peerEndpoint = 'localhost:7051';
+
+export async function newGrpcConnection(): Promise<grpc.Client> {
+    const tlsRootCert = await fs.readFile(tlsCertPath);
+    const tlsCredentials = grpc.credentials.createSsl(tlsRootCert);
+    return new grpc.Client(peerEndpoint, tlsCredentials, {
+        'grpc.ssl_target_name_override': 'peer0.org1.example.com',
+    });
+}
+
+export async function newIdentity(): Promise<Identity> {
+    const credentials = await fs.readFile(certPath);
+    return { mspId, credentials };
+}
+
+export async function newSigner(): Promise<Signer> {
+    const files = await fs.readdir(keyDirectoryPath);
+    const keyPath = path.resolve(keyDirectoryPath, files[0]);
+    const privateKeyPem = await fs.readFile(keyPath);
+    const privateKey = crypto.createPrivateKey(privateKeyPem);
+    return signers.newPrivateKeySigner(privateKey);
+}

asset-transfer-events/application-gateway-typescript/tsconfig.json

@@ -0,0 +1,18 @@
+{
+   "extends":"@tsconfig/node14/tsconfig.json",
+   "compilerOptions": {
+       "experimentalDecorators": true,
+       "emitDecoratorMetadata": true,
+       "outDir": "dist",
+       "moduleResolution": "node",
+       "declaration": true,
+       "sourceMap": true,
+       "noImplicitAny": true
+   },
+   "include": [
+       "./src/**/*"
+   ],
+   "exclude": [
+       "./src/**/*.spec.ts"
+   ]
+}

asset-transfer-events/application-javascript/app.js

@@ -47,13 +47,13 @@
 //         ./network.sh deployCC -ccn events -ccp ../asset-transfer-events/chaincode-javascript/ -ccl javascript -ccep "OR('Org1MSP.peer','Org2MSP.peer')"
 //
 // - Be sure that node.js is installed
-//         ===> from directory asset-transfer-sbe/application-javascript
+//         ===> from directory asset-transfer-events/application-javascript
 //         node -v
 // - npm installed code dependencies
-//         ===> from directory asset-transfer-sbe/application-javascript
+//         ===> from directory asset-transfer-events/application-javascript
 //         npm install
 // - to run this test application
-//         ===> from directory asset-transfer-sbe/application-javascript
+//         ===> from directory asset-transfer-events/application-javascript
 //         node app.js
 
 // NOTE: If you see an error like these:

ci/scripts/run-test-network-events.sh

@@ -35,11 +35,15 @@ stopNetwork
 print "Remove wallet storage"
 rm -R ../asset-transfer-events/application-javascript/wallet
 
-# Run Go gateway application
+
+# Run typescript gateway application
 createNetwork
-print "Initializing Go gateway application"
-pushd ../asset-transfer-events/application-gateway-go
-print "Executing application"
-go run .
+print "Initializing typescript application"
+pushd ../asset-transfer-events/application-gateway-typescript
+npm install
+print "Build app"
+npm run build
+print "Executing dist/app.js"
+npm start
 popd
 stopNetwork