intech

version: "3.2"

services:
  postgresql:
    image: postgres
    container_name: postgresql
    hostname: postgresql
    restart: always
    environment:
      POSTGRES_USER: confluence

intech

describe("Test route.path and aliases", () => {
	let broker;
	let app;
	let service;
	let nextHandler = jest.fn((req, res) => res.sendStatus(200));

	beforeAll(() => {

		broker = new ServiceBroker({ logger: false });

intech

leveldb

am e,bedded key/value database. Is good to be a modular database. If you wanna run applications on browser as well as in node.

its embedded it is in the same process. It lives in the program. It was built for chrome.

install

Since leveldb is a standalone database, you can install it with npm:

intech

███╗   ███╗ ██████╗ ██╗     ███████╗ ██████╗██╗   ██╗██╗     ███████╗██████╗
████╗ ████║██╔═══██╗██║     ██╔════╝██╔════╝██║   ██║██║     ██╔════╝██╔══██╗
██╔████╔██║██║   ██║██║     █████╗  ██║     ██║   ██║██║     █████╗  ██████╔╝
██║╚██╔╝██║██║   ██║██║     ██╔══╝  ██║     ██║   ██║██║     ██╔══╝  ██╔══██╗
██║ ╚═╝ ██║╚██████╔╝███████╗███████╗╚██████╗╚██████╔╝███████╗███████╗██║  ██║
╚═╝     ╚═╝ ╚═════╝ ╚══════╝╚══════╝ ╚═════╝ ╚═════╝ ╚══════╝╚══════╝╚═╝  ╚═╝

intech

Networking-streams

servers and clients

Any networked computer can be a server Any networked computer can be a client

Package a put in a little pieces.

tc vs udp

TCP - reliable transport: has ACK

intech

Unique hex-string (time+random) with fixed length 11:

(Math.round(Math.random() * 0x10000) + Date.now()).toString(16)
// 16c8e982dcd
// 16c95dc3c76
// 16cb7307195

Unique string (time+random) with fixed length 8:

intech

#!/bin/sh -e

if [ $# != 3 ]
then
    echo "usage: $0 <src-port> <dst-host> <dst-port>"
    exit 0
fi

TMP=`mktemp -d`
PIPE=$TMP/pipe

intech

require("http").request({host:"localhost",port:80,timeout:2000},res=>process.exit(res.statusCode!==200)).on("error",()=>process.exit(1));

intech

for i in $(seq 1 3);
do 
  docker-compose pull roach$i
  docker-compose exec roach$i /cockroach/cockroach quit --insecure
  docker-compose up -d --build roach$i
done

intech

// broker.js
"use strict";

const { ServiceBroker } = require("moleculer");
const Sequelize = require("./middlewares/sequelize");
const broker = new ServiceBroker({
	middlewares: [Sequelize()]
});
broker.createService({
	name: "service",