StevenJL

/*
  Kill long-running read-only queries
*/
SELECT 
  application_name, 
  pg_cancel_backend(pid), /* returns boolean indicating whether or not query was killed */
  state, 
  age(clock_timestamp(), query_start), 
  usename, 
  query

StevenJL

SELECT count(*) 
FROM pg_stat_activity 
WHERE state != 'idle' 
AND query_start < (NOW() - INTERVAL '60 seconds');

StevenJL

SELECT application_name, 
       pid, 
       state,
       age(clock_timestamp(), query_start), /* How long has the query has been running in h:m:s */
       usename, 
       query /* The query text */
FROM pg_stat_activity
WHERE state != 'idle'
AND query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start asc;

StevenJL

require "jwt"

SIGNING_SECRET = 'jwtsigningsecret'
ALGORITHM = 'HS512'

# A payload with sensitive information
payload_sensitive = { social_security_number: "555-44-7777" }

# The token has been encoded, but not encrypted
token_with_sensitive = JWT.encode payload_sensitive, SIGNING_SECRET, ALGORITHM

StevenJL

require "jwt"
SIGNING_SECRET = 'jwtsigningsecret'
ALGORITHM = 'HS512'

# Suppose a sender wants to send the following payload
transfer_50_payload = { transfer_amt: 50 }

token_legit = JWT.encode payload, SIGNING_SECRET, ALGORITHM
# eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.eyJ0cmFuc2Zlcl9hbXQiOiI1MCJ9.tf8g0nTprdIzoqLVrjLJS5bYFysiLYal8o4OeBbOuebU1UxGdKYhtADLD2oLzO_P2QmZBFqsF7uAAaN3DvYYAw

StevenJL

export default function applyMiddleware(...middlewares) {
  return createStore => (...args) => {
    const store = createStore(...args)
    let dispatch = () => {
      throw new Error(
        'Dispatching while constructing your middleware is not allowed. ' +
          'Other middleware would not be applied to this dispatch.'
      )
    }

StevenJL

import { createStore, applyMiddleware } from 'redux';
import someMiddleware from 'some-redux-middleware';
import rootReducer from './reducers/index';
const store = createStore(rootReducer, applyMiddleware(someMiddleware));

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class SomeForm extends React.Component {

  handleFirstNameChange = (event) => {
    this.setState({firstName: event.currentTarget.value});
    console.log(this.state.firstName)
  }

  render () {
    return (
      <div>

StevenJL

// form_container.js
import { connect } from 'react-redux';
import { ReduxControlledComponent } from './components';

const mapStateToProps = (state) => {
  return {
    name: state.name,
    email: state.email,
    password: state.password
  }

StevenJL

class ButtonComponent extends React.Component { 
  constructor(props) { 
    super(props) 
    this.state = {
      message: 'I do not need to be manually binded!', 
    } 
  } 
 
  // this is now defined using the arrow function syntax
  handleClick = () => {