Tools, FAQ, Tutorials:
evaluate-transaction.js - Evaluate Chaincode Transaction
How to write a Node.js script to evaluate a transaction defined in the Invoke method of a chaincode?
✍: FYIcenter.com
Here is sample Node.js script, evaluate-transaction.js, that uses a given user identity from the local wallet to evaluate a transaction on chaincode.
/* Copyright (c) FYIcenter.com */ 'use strict'; const { FileSystemWallet, Gateway } = require('fabric-network'); const fs = require('fs'); const ccp = JSON.parse(fs.readFileSync("connection.json", 'utf8')); const user = process.argv[2]; const channel = process.argv[3]; const chaincode = process.argv[4]; const tx = process.argv.slice(5); async function main() { try { // Create a new gateway for connecting to our peer node. const wallet = new FileSystemWallet("wallet"); const gateway = new Gateway(); await gateway.connect(ccp, { wallet, identity: user, discovery: { enabled: false } }); // Get the network (channel) our contract is deployed to. const network = await gateway.getNetwork(channel); // Get the contract from the network. const contract = network.getContract(chaincode); // Evaluate the specified transaction. const result = await contract.evaluateTransaction(...tx); console.log("Tx function and arguments:"); console.log(tx); console.log("Tx result: %s", result); } catch (error) { console.error(`Failed to evaluate transaction: ${error}`); process.exit(1); } } main();
To run this application script on your client system, you need finish the last tutorial to register "alice" to ca.example.com, and import the certificate and the key info the local wallet.
Try the script to call the queryAllCars() function of the "fabcar" Invoke() method.
$ node evaluate-transaction alice mychannel fabcar queryAllCars Tx function and arguments: [ 'queryAllCars' ] Tx result: [ {"Key":"CAR0", "Record":{"colour":"blue","make":"Toyota","model":"Prius","owner":"Tomoko"}}, {"Key":"CAR1", "Record":{"colour":"red","make":"Ford","model":"Mustang","owner":"Brad"}}, {"Key":"CAR2", "Record":{"colour":"green","make":"Hyundai","model":"Tucson","owner":"Jin Soo"}}, ... ]"
⇒ submit-transaction.js - Submit Chaincode Transaction
⇐ register-user.js - Register New User
2019-04-22, 1090🔥, 0💬
Popular Posts:
Can Multiple Paragraphs Be Included in a List Item? Yes. You can include multiple paragraphs in a si...
Where to find tutorials on Visual Studio? I want to know How to learn Visual Studio. Here is a large...
How to start Visual Studio Command Prompt? I have Visual Studio 2017 Community version with Visual C...
How to build a PHP script to dump Azure AD 2.0 Authentication Response? If you are use the Azure-AD-...
How To Avoid the Undefined Index Error in PHP? If you don't want your PHP page to give out errors as...