Vishwas Anand Bhushan Vishwas1

Using android Keystore

Importing keystore

//TODO: import keystore in the project

Setting up postgres in stellar with UNIX socket

Setup UNIX socket in with stellar postgres db
sudo systemctl stop postgresql
Update the file sudo vi /etc/postgresql/9.5/main/pg_hba.conf with local core stellar md5
Update the db connection string in stellar-core.cfg with DATABASE="postgresql://dbname=core host=/var/run/postgresql user=stellar password=stellar"
sudo systemctl start postgresql
restart the stellar-core

Setting up stellar with sqllite

I wanted to learn Kalaripayattu - took 1 month leave from office.
Took flight to Kochi from Chennai.
It was a small village in rainforest in a place called Athirapally in Kerala.
This place was full of jungle, waterfalls and small tribal villages.
A tribal man took me into the jungle where there was Kalari - the school to learn Kalaripayattu
It was big room - lot of weapons - few people were practising
Met a woman, Paravathi - tall, strong, brown in color, bold and big eyes. I looked at her biceps. - she was no less than a warrior.
I was wondering is it really needed in this 21st century ? What about our army ? It looks like they are preparing for war. As usual I had many unanswered questions.
She took me to her house - a small hut with granny inside. She told me to get sleep and wake up at 3 AM in the morning for practise.
Granny told me stories about Kalaripayattu - how britishers banned that artform and came to the village in the search of that book. A book? What book? I asked

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Zagg multi node sync problem and possible solutions

Problem :

Zagg multi node sync (for bitcoin blocks) won’t work since we were not making level dbs sync to each other.

Setup 2 node zagg network using stellar’s configurations
Throw transaction with Account Marker operation (for bitcoin transaction HEX) over one of the node.
The operation has to go through validation from Bitcoin code base using doValidate() of the operation.
After getting all the operations validated, the transaction goes into mPendingTransaction (which is nothing but memepool for stellar.)

Find unspents

listunspents

[...]

Create Transaction

As you can see network is running

CONTAINER ID        IMAGE                               COMMAND                  CREATED             STATUS              PORTS                                                                    NAMES
b33ee58cff04        hyperledger/fabric-peer:1.4.0       "peer node start --p…"   2 minutes ago       Up 2 minutes        0.0.0.0:7151->7051/tcp, 0.0.0.0:7152->7052/tcp, 0.0.0.0:7153->7053/tcp   peer0.org2.hurley.lab
4e5f88113b8c        hyperledger/fabric-peer:1.4.0       "peer node start --p…"   2 minutes ago       Up 2 minutes        0.0.0.0:7051-7053->7051-7053/tcp                                         peer0.org1.hurley.lab
e486d8bb7d29        hyperledger/fabric-couchdb:0.4.14   "tini -- /docker-ent…"   2 minutes ago       Up 2 minutes        4369/tcp, 9100/tcp, 0.0.0.0:5184->5984/tcp                               couchdb.peer0.org2.hurley.lab
cb3d0de40305        hyperledger/fabric-ca:1.4.0         "fabric-ca-server st…"   2 minutes ago       Up 2 minutes        0.0.0.0

Hurl

hurl is a tool create hyperledger easily. Its just a wrapper over native HL fabric.
Analogy to hurl could be Ganache.
After network creation via hurl, we can see the configurations files in the folder:

Install Hurl

sudo npm install -g @worldsibu/hurley --unsafe-perm=true

	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<parent>
	<artifactId>hanko-plugin-keycloak-parent</artifactId>
	<groupId>io.hanko.plugins.keycloak</groupId>
	<version>0.2-SNAPSHOT</version>
	<relativePath>../pom.xml</relativePath>
	</parent>

	<name>HANKO Plugin Keycloak EJB</name>

	const { from, timer } = require('rxjs');
	const fetch = require('node-fetch');

	const getTimeFromAPI = () => {
	return fetch('http://worldclockapi.com/api/json/est/now')
	.then((resp) => resp.json())
	}


	// Observer timer and subscribe