corda | open source blockchain project , designed for business | Blockchain library
kandi X-RAY | corda Summary
kandi X-RAY | corda Summary
Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of corda
corda Key Features
corda Examples and Code Snippets
Lines of Code : 110License : Strong Copyleft (CC BY-SA 4.0)
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//Test class
public class Test {
public static void main(String[] args) {
Node root = new Node(1, "test1", new Node[]{
new Node(2, "test2", new Node[]{
new Node(5, "test6", new Node[]{})import {DOMParser as dom} from "xmldom";
import * as xpath from "xpath";
export default class FileJob extends BaseJob {
async execute(settings: JobSettings) {
this.poke('C:\\Temp\\LocalCache\\Config.xml','/Root','');
}
class TrieNode {
constructor(data=null) {
this.children = {}; // Dictionary,
this.data = data; // Non-null when this node represents the end of a valid word
}
addWord(word, data) {
let node = this; // tFROM node:16.13.0-alpine
USER node
ADD --chown=node:node . /home/node
RUN cd /home/node && \
npm install --production
CMD [ "node", "/home/node/app.js" ]
const process = require("process");
console.log(process.memoryUsage());
$ node index.js
{
rss: 4935680,
heapTotal: 1826816,
heapUsed: 650472,
external: 49879,
arrayBuffers: 9386
}export GOOGLE_APPLICATION_CREDENTIALS=/path/to/auth/service_acct_key.json
node server.js
it('should call print and cancel', () => {
// spy on print and cancel on window object
const printSpy = spyOn(window, 'print');
const cancelSpy = spyOn(window, 'cancel');
// call print
component.print({/* mock component howevimport { useState } from 'react';
import { Text } from 'react-native';
const App = () => {
const [scan, setScan] = useState(false);
const [result, setResult] = useState();
function onSuccess(e){
setResult(e.data);
setSca npx @nestjs/cli g controller pages
which node
which nodejs
alias nest="/your/path/to/node/bin/nest"
nest --version
Community Discussions
Trending Discussions on corda
QUESTION
I had cloned the cordapp-kotlin-template . I've defined a state called LoadState which looks like this:
...ANSWER
Answered 2022-Jan-24 at 04:23After our discussion in the above comments section, it appears that your states have been issued using Whitelist zone constraint.
Also looking at the code it is clear that you have not explicitly added Whitelist Zone constraints for your states. Then there remain two more possibilities by which states are issued using Whitelist Zone constraint.
One is you are using some Corda version before 4 or you have included the necessary configs to include white list zone constraints in network bootstrapper as specified here. You have two options - either start from scratch and make sure you use Corda 4.
If you cannot start from scratch follow this path to first migrate the whitelist zone constraints to signature constraints, before running your UpdateLoadFlow. You can refer to this blog which talks about constraint migration.
QUESTION
The java -jar corda.jar command picks up cordapps from $basedir/cordapps by default. Is there an option to specify an alternatively cordapps directory? This may be useful when multiple nodes are sharing the same set of cordapps.
ANSWER
Answered 2021-Dec-29 at 09:09It's not possible to override only cordapp path. You can override the workspace directory and other fields in the node.conf (documentation).
An option could be to mount a folder in each node from a shared filesystem (e.g. EFS on AWS) where you store the cordapps.
QUESTION
I am trying to create a POC of Corda. I was able to connect 3 nodes running in my system with different ports. But now i want to connect different vms running on different system. What I am planning to do is run two vms on two different systems as two different nodes. How do i connect them?
I am attaching my node configuration
...ANSWER
Answered 2021-Dec-28 at 13:58Easiest way to make Nodes known to eachother without using a network-map-service is to copy each node's "nodeinfo-*"-file into all other node's "additional node-infos" directory (see here ). This directory will contain all node-info files that this specific node knows about(their names, parties, ip-addresses, ports etc.) Also make sure that your vm is capable of inbound and outgoing connections like Alessandro Baffa said.
You can read up on this topic here: https://docs.r3.com/en/platform/corda/4.8/open-source/network-map.html
QUESTION
I have a Corda Infrastructure with some nodes and a (not validating) notary. They're all using a Network Map for the compatibility zone, and all the corda nodes, including the notary, download the same network-parameters file.
When executing a flow, Corda gives me an Exception because the Notary is not on the network parameters whitelist. I cannot find anything anything about that on R3 Documentation.
...ANSWER
Answered 2021-Dec-26 at 02:09Do I have to do something explicit to add Notary in network parameters whitelist?
Yeah you do. Since you are using a network-map-service your node will get its network-parameters from there.
What you'll have to do then is
- delete your current network-parameters for every Node.
- whitelist your Notary Node into your network-map-service
- restart all your Nodes so they can retrieve the new network-parameters from the network-map-service where the new Notary is assigned as such
I don't know which network-map-service exactly you use but i assume its nms by cordite. You can read up on how to whitelist a Notary here: https://gitlab.com/cordite/network-map-service/-/blob/master/FAQ.md#14-start-the-notary-node
QUESTION
I could see there is a dependency with log4j and log4j-core-2.13.3.jar is embedded in corda.jar. Is there any update available or how can we fix the log4j related vulnerability
...ANSWER
Answered 2021-Dec-20 at 06:49This page provides updates on all major alerts, fixes and forthcoming patch releases. Check the top of the page for the most urgent alerts.
QUESTION
I have two parties (A and B). A sends to B a Corda State using SignTransactionFlow, so also obtains the counterparty signature for that transaction.
Is it possibile to share a Corda State without using a SignTransactionFlow but using a sendAndReceive calls? If so, will the counterparty receiving a Corda State through sendAndReceive be able to consume that state?
...ANSWER
Answered 2021-Dec-18 at 00:14Yes, it's possible to send states using send() and receive(). Here is a code sample that I tested to see if it works:
QUESTION
I'm coding a REST API that connects to my Corda Node via Corda RPC. I'm trying to create a mock testing corda network with TestContainers so that I can verify the behaviors of my REST API. I know Corda has official docker image. Is there any guidance on how might I go about implementing this?
...ANSWER
Answered 2021-Nov-15 at 10:26I would look at this/divide this into two parts.
- Server side testing - Testing your node RPC endpoints.
- Client side testing - Testing your rest endpoints.
For the first part, you can use the NodeDriver to write the integration tests. Using the NodeDriver, you can bring up nodes locally to run flows and inspect state updates. The NodeDriver allows you to access the node using RPC endpoints. You can read more about NodeDriver here.
For the second part, you can use something like mockito to mock the RPC calls and test your client logic.
This way you will easily be able to test client and server side.
To do an actual end to end integration test, you will have to start the docker nodes using a script and then you can test the methods from the client code.
QUESTION
The official docker image for Corda uses a run-corda command to start the node. However, sometimes the node needs to be configured first before starting up. An example would be to run database migration scripts when new schemas are introduced by new CorDapps. How can I run such commands first before starting up the node?
ANSWER
Answered 2021-Nov-09 at 12:14The question is answered on Corda's Slack channel. I'll just move it here.
The problem can be solved by overriding the image's start-up command (run-corda) with the following:
QUESTION
In Corda we are using CordaRPCClient to initiate transaction from the client. Here we are passing username and password to start the connection. Right now I am using hardcoded user name and password. Can I map this to a user table which is there in DB. Please share if there any best practices exists.
...ANSWER
Answered 2021-Oct-26 at 16:44Yes you can definitely have rpc users fetched from a database. All you would need is some configuration in the nodes configuration file (node.conf).
The users are generally defined in the security block. Below is how it can be configured.
QUESTION
I'm having trouble setting up the development environment for Corda. It seems IntelliJ's code completion feature is malfunctioning. I suspect that it's because incompatible kotlin language version (v1.2.71, used by Corda 4) with IntelliJ's kotlin-plugin version (v1.5).
This is what I want IntelliJ to do when I'm typing the code
This is what actually happened. As can be seen, no auto-completion or method suggestion showsed up.
The above two snippets are recorded in the same setting, but why is it working in the first case but failed in the second? How can I configure my environment so code completion can work?
...ANSWER
Answered 2021-Oct-23 at 21:42As you said, the problem is the not compatibility with the latest version of the Kotlin plugin. To develop smoothly with Corda 4.x it is better to use an older version of IntelliJ (2020). It is frustrating, I know. Corda 5 support for Kotlin will be, hopefully, better.
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