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// This middleware example takes in the entire swagger spec and tries to find the route in it.

const validate = require('swagger-route-validator');
const spec = require('./my-spec');

function validateRequest(req, res, next) {
    const layer = app._router.stack.find(bloc => bloc.route && bloc.regexp.exec(req.originalUrl) !== null);
    
    // Check if route exists
    if (!layer) return next();

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export function to<T = any>(promise: Promise<T>): Promise<[null, T] | [any, null?]> {
  return promise
    .then((data) => [null, data] as [null, T])
    .catch((err) => [err] as [any]);
}

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export function deferred<T>() {
  let resolve: (value?: T | PromiseLike<T>) => void;
  let reject: (reason?: any) => void;
  const promise = new Promise<T>((res, rej) => {
    resolve = res;
    reject = rej;
  });

  return { promise, resolve, reject };
}

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1. Identify total average [R]equests per second
2. Identify average response [T]ime per request
3. Calculate:

((R * T) / 1000) * 1.2

Ex:

((200 RPM * 200ms) / 1000) * 1.2 = 48 connections required

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#!/bin/bash
# Go setup:

bash < <(curl -s -S -L https://raw.githubusercontent.com/moovweb/gvm/master/binscripts/gvm-installer)
source ~/.gvm/scripts/gvm
sudo apt-get install bison -y
gvm install go1.14 -B
gvm use go1.14

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function romanToNum(str) {
    const symbols = 'IVXLCDM';

    let acc = '';
    // Reverse iterate through the provided characters
    for (let i = str.length - 1; i >= 0; i--) {
        // Get the associated roman character symbol's order in the list
        let index = symbols.indexOf(str[i]);
        // Calculate the value for the symbol 1 || 5 ^ 10 based on the previous index value
        let value = (index % 2  === 0 ? 1 : 5) * (10**(index>>1));

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const { promisify } = require('util');

const stream = collection.find();
const next = promisify(stream.nextObject);

let row;
while(null !== (row = await next(stream))) {
  // do stuff with your row
}

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# Final production image
# ===============================
FROM node:14 as final

RUN mkdir /app && chown node:node /app

RUN wget -O /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.2/dumb-init_1.2.2_amd64
RUN chmod +x /usr/local/bin/dumb-init

USER node

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const toRadians = num => num * Math.PI / 180;

// Get the long, lat values for the desired dc 
module.exports.datacenters = {
  'ap-east-1':      [22.29,  114.16 ],
  'ap-northeast-1': [35.41,  139.42 ],
  'ap-northeast-2': [37.56,  126.98 ],
  'ap-northeast-3': [34.65,  136    ],
  'ap-south-1':     [19.08,  72.88  ],
  'ap-southeast-1': [1.37,   103.8  ],

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/**
 * Multi-process request
 */

/* Requires ------------------------------------------------------------------*/

const crypto = require('crypto');
const path = require('path');
const fork = require('child_process').fork;