zmts

# post_loc.txt contains the json you want to post
# -p means to POST it
# -H adds an Auth header (could be Basic or Token)
# -T sets the Content-Type
# -c is concurrent clients
# -n is the number of requests to run in the test

ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 "http://example.com/api/v1/locations/"

zmts

Lack of of file descriptors; Too many open files; Mac OS;

Mac OS X Catalina

Issue:

ab -c 300 -n 1000 https://super.com/api

zmts

Auto update application build version. Husky pre-commit hook.

package.json

"husky": {
    "hooks": {
      "pre-commit": "npm run build && node ./update-build.js"
    }
  }

zmts

tmux common comands

Configure tmux

> nano ~/.tmux.conf

# default: ctrl-b
# set prefix ctrl-q
set-option -g prefix C-q 

zmts

Webstorm: auto import with single quotes and spases between braces

Preferences --> Editor --> Code Style --> Typescript/JavaScript --> Punctuation [Tab] --> Use [Single] quotes in [New Code]

Preferences --> Editor --> Code Style --> Typescript/JavaScript --> Spaces [Tab] --> Scroll to section "Within" and check ES6 import/export braces

zmts

Первичная настойка Debian Linux/Разворачиваем серверную инфраструктуру на Digital ocean

Для проектов среднего и небольшого размера не всегда оправданно использовать AWS/Kubernetes подобную технологию. Для проектов нуждающихся в нескольких серверах отлично подходит Digital ocean. Который к тому же предоставляет средства вертикального скейлинга(увеличение производительной мощности уже существующих серверов).

SSH cертификат

Создаем сертификат под которым будем логинится на сервера нашего проекта (на локальной машине)

ssh-keygen -t rsa -b 4096 -f /Users/alex/.ssh/myproject_test -C "myproject comment"

Не забываем сделать его бекап

zmts

SSH cert to remote server access

Generate ssh certificate with unique filename. Stroring keys in separate files will help make backup without not related keys.

➜ cd /Users/alex/.ssh
➜ ssh-keygen -t rsa -b 4096 -f myproject_test -C "myproject comment"

Generating public/private rsa key pair.

zmts

Raw SQL query vs Query builders (Knex.js/Objection.js)

Raw SQL

static async listPostsPublicRaw ({ offset, limit, filter = {} } = {}) {
    assert.integer(limit, { required: true, min: 10 })
    assert.integer(offset, { required: true, min: 0 })
    assert.validate(filter.blogId, BlogModel.schema.id, { required: true })
    assert.validate(filter.stackId, StackModel.schema.id)

zmts

Debounce with promises

// https://stackoverflow.com/questions/35228052/debounce-function-implemented-with-promises

function debounce (inner, ms = 0) {
  let timer = null
  let resolves = []

 return function (...args) {

zmts

importScripts('https://www.gstatic.com/firebasejs/7.8.2/firebase-app.js')
importScripts('https://www.gstatic.com/firebasejs/7.8.2/firebase-messaging.js')

firebase.initializeApp({
    apiKey: "---",
    authDomain: "test.firebaseapp.com",
    databaseURL: "https://test.firebaseio.com",
    projectId: "test",
    storageBucket: "test.appspot.com",
    messagingSenderId: "11111111111",