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Node.js in 2020 - part 1

Timur Shemsedinov
Timur Shemsedinov

The document presents a Node.js starter kit that emphasizes minimal code and dependencies while ensuring performance and security. It discusses the execution strategies and isolation techniques for applications, including using virtual machines, containers, and worker threads. Additionally, it highlights features and improvements introduced in various Node.js versions and addresses the readiness of Node.js for serious applications.

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const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js in 2020 #1 Выйди и зайди нормально Timur Shemsedinov github.com/HowProgrammingWorks github.com/tshemsedinov Chief Technology Architect at Metarhia Lecturer at Kiev Polytechnic Institute
github.com/tshemsedinov https://youtube.com/TimurShemsedinov github.com/HowProgrammingWorks/Index Весь курс по ноде (>35.5 часов) https://habr.com/ru/post/485294/ t.me/HowProgrammingWorks t.me/NodeUA timur.shemsedinov@gmail.com
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js Starter Kit no dependencies: 15kb size, with PG drivers + 1.2mb
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Starter Kit Key Ideas ● Минимум кода и зависимостей ● Минимизация I/O, отдача всего из памяти ● Безопасность и изоляция контекстов ● Структура и архитектура приложения ● Разделение системного и прикладного слоя ● Все на контрактах (interface) ● Балансировка, таймауты и очередь запросов
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Starter Kit Feature List ● Автороутинг API и поддержка HTTP(S), WS(S) ● Подгрузка изменений на лету через fs.watch ● Загрузчик конфигурации и Graceful shutdown ● Утилизация CPU, кластеризация через потоки ● Слой доступа к данным DAL: Postgresql ● Сессии с сохраняемым состоянием ● Песочницы, потоки, масштабирование, тесты
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js in 2020 State of the platform and future
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js уже 10 лет: v0.0.1 — 27 мая 2019 0.10.x и 0.12.x — (2013 - 2016) Io.js 1.x, 2.x, 3.x — (2014 - 2015) Argon 4.x (2015 - 2018), 5.x (2015 - 2016), Boron 6.x (2016 - 2019), 7.x (2016 - 2017), Carbon 8.x (2017 - 2019), 9.x (2017 - 2018), Dubnium 10.x (2018 - 2021),11.x (2018 - 2019), Erbium 12.x (2019 - 2022), 13.x (to June 2020) 14.x (April 2020 - April 2023), 15.x(2020-)
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js features 8.x V8 6.0, async/await, TurboFan and Ignition 10.x V8 6.6, HTTP/2, fs.promises, BigInt, npm 6 12.x V8 7.8, TLS 1.3, OpenSSL 1.1.1c, npm 6.10.3 js: #, static, async/await, async stack, динамическая куча, llhttp и llparser, threads, DOS в HTTP/2, startup, fs.rmdir & fs.Dir, process.resourceUsage()
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js features 13.x V8 7.8, npm 6.13.6, libuv 1.34.1 WASI, worker.resourceLimits, vm.Module Source map, Advanced Serialization API 14.x Ожидания: V8 8.x: больше доступа к v8 api HTTP/3 (HTTP over IETF QUIC) улучшения в WASI, N-API, async_hooks streams, в работе с workers и esm
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Shared memory and Atomics Появилось в Node.js 9 ■ SharedArrayBuffer ■ Atomics ○ add, sub, and, or, xor ○ store, load, exchange, compareExchange ○ notify, wait, wake (deprecated)
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Threads vs Processes process process JavaScript thread V8libuv node.js JavaScript thread V8 libuv node.js JavaScript thread V8 libuv node.js IPC
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Why Isolation? ● Ошибки ● Утечки памяти и других ресурсов ● Приложение: данные, соединения с БД ● Файловая система и корневой каталог ● Окружение ОС, PID, IPC ● Безопасность ОС: пользователи, группы ● Сеть: дескрипторы сокетов, порты, хосты
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Execution Strategy Problems ● Недостаточная изоляция исполнения запросов к серверу друг от друга ● Один неудачный запрос может убить все параллельно исполняемые ● В асинхронной среде сложно найти и связать ошибку с запросом ● Изоляция приложений и организаций в SaaS
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Execution Isolation ● VPS (виртуальная машина) ● Контейнер (Docker) ● Провесс (node) ● Поток (встроенный модуль worker_threads) ● Песочница (vm.createContext, vm.Script) ● Программная абстракция (объект или замыкание)
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Links Node https://nodejs.org/en/about/releases/ https://nodejs.org/en/blog/ https://node.green/ Deno https://github.com/denoland/deno https://youtu.be/z6JRlx5NC9E
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Deno ● Безопасность: файловая система, сеть, окружение ● V8, TypeScript ● Rust вместо C++ ● Tokio (event loop, I/O scheduler) ● Встроенный менеджер пакетов
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js Готовность ноды для серьезных систем Проблемы ноды ● Безопасность, заражения, зависимости ● Потерянные ошибки, утечки, перезапуски ● Асинхронность и стектрейс Перспективы платформы
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) v8 Serialization API v8.serialize, v8.deserialize v8.Serializer, v8.Deserializer
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Race Condition const v8 = require('v8'); const dataset = [ { name: 'Marcus Aurelius', born: 121 }, { name: 'Mao Zedong', born: 1893 }, ]; const v8Data = v8.serialize(dataset); const obj = v8.deserialize(v8Data);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c v8 Serialization
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) vm Sandboxing vm.Script, vm.runInContext and v8::Context
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.createContext const vm = require('vm'); const sandbox = { console: new Logger(), require: wrap(require), application: new Application(), }; sandbox.global = sandbox; vm.createContext(sandbox);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.Script const vm = require('vm'); const fs = require('fs'); const code = await fs.readFile(fileName, 'utf8'); const src = `'use strict';n context => ${code}`; const script = new vm.Script(src); script.runInContext(sandbox, { timeout: 5000 });
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.Script const options = { timeout: 5000, displayErrors: false, // default: true breakOnSigint: true, // default: false, CTRL+C }; script.runInContext(sandbox, options); const object = { /* global */ }; script.runInNewContext(object, options); script.runInThisContext(options);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) ES.Next ECMAScript 2020
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c ES.Next features ● Приватные и статические поля ● Изменения в Array, Object, String ● Atomics и SheredArrayBuffer ● Коллекции Set, Map, WeakSet, WeakMap ● globalThis ● Math
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Rest const f = (a, b, ...array) => {}; const g = ({ a, b, ...array }) => {}; const { name, ...rest } = obj; Spread f(a, b, ...array); const obj2 = { name, ...obj1 }; const clone = { ...obj };
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Exponentiation Math.pow(x, y) x ** y x **= y x = x ** y Optional chaining const spqr = { emperor: { name: 'Marcus' } }; console.log(spqr.emperor?.name); console.log(spqr.president?.name);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Exponentiation Math.pow(x, y) x ** y x **= y x = x ** y Optional chaining (still waiting v8 8.x in Node.js) const spqr = { emperor: { name: 'Marcus' } }; console.log(spqr.emperor?.name); console.log(spqr.president?.name);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Asynchronous iterable contract Symbol.iterator iterable[Symbol.iterator]() Symbol.asyncIterator asyncIterable[Symbol.asyncIterator]()
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Try...catch try { throw new Error('message'); } catch { console.log('no arguments catched'); }
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Function ((a, b) => { const c = a + b; // hello there return c; }).toString() "(a, b) => { const c = a + b; // hello there return c; }"
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.finally new Promise(executor) .then(onFulfilled[, onRejected]) .catch(onRejected) .finally(onFinally);
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled const p1 = Promise.resolve('p1'); const p2 = new Promise((resolve, reject) => { setTimeout(resolve, 1000, 'p2'); }); const p3 = new Promise((resolve, reject) => { setTimeout(reject, 100, 'p3'); }); Promise.all([p1, p2, p3]).then(values => { console.log(values); });
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled Promise.all([p1, p2, p3]).then(values => { console.log(values); }); node:26549) UnhandledPromiseRejectionWarning: p3 (node:26549) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:26549) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled const p1 = Promise.resolve('p1'); const p2 = new Promise((resolve, reject) => { setTimeout(resolve, 1000, 'p2'); }); const p3 = new Promise((resolve, reject) => { setTimeout(reject, 100, 'p3'); }); Promise.allSettled([p1, p2, p3]).then(values => { console.log(values); });
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled Promise.allSettled([p1, p2, p3]).then(values => { console.log(values); }); [ { status: 'fulfilled', value: 'p1' }, { status: 'fulfilled', value: 'p2' }, { status: 'rejected', reason: 'p3' } ]
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Состояние гонки В параллельном и асинхронном программировании
Web Locks API in node.js & browser Timur Shemsedinov Chief Technology Architect at Metarhia Lecturer at KPI
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Why do we need Web Locks API ? — Do you know what is mutex, locks, critical section, race condition, parallel programming at all? — Congrats! It’s is very likely that all your JavaScript code broken )))
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Concurrent Computing
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Concurrency Problems ● Race condition ● Deadlock ● Livelock ● Resource starvation ● Resource leaks
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Synchronization Primitives Semaphore Binary semaphore Counting semaphore Condition variable Spinlock Mutex Timed mutex Shared mutex Recursive mutex Monitor Barrier
const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Links Spec: wicg.github.io/web-locks MDN: developer.mozilla.org/en-US/docs/Web/API/Web_Locks_API Implementation: github.com/metarhia/web-locks Examples: github.com/HowProgrammingWorks/RaceCondition github.com/HowProgrammingWorks/Semaphore github.com/HowProgrammingWorks/Mutex Async prog: habr.com/ru/post/452974/
Questions?
github.com/tshemsedinov https://youtube.com/TimurShemsedinov github.com/HowProgrammingWorks/Index Весь курс по ноде (>35.5 часов) https://habr.com/ru/post/485294/ t.me/HowProgrammingWorks t.me/NodeUA timur.shemsedinov@gmail.com

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Node.js in 2020 - part 1

  • 1. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js in 2020 #1 Выйди и зайди нормально Timur Shemsedinov github.com/HowProgrammingWorks github.com/tshemsedinov Chief Technology Architect at Metarhia Lecturer at Kiev Polytechnic Institute
  • 2. github.com/tshemsedinov https://youtube.com/TimurShemsedinov github.com/HowProgrammingWorks/Index Весь курс по ноде (>35.5 часов) https://habr.com/ru/post/485294/ t.me/HowProgrammingWorks t.me/NodeUA [email protected]
  • 3. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js Starter Kit no dependencies: 15kb size, with PG drivers + 1.2mb
  • 4. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Starter Kit Key Ideas ● Минимум кода и зависимостей ● Минимизация I/O, отдача всего из памяти ● Безопасность и изоляция контекстов ● Структура и архитектура приложения ● Разделение системного и прикладного слоя ● Все на контрактах (interface) ● Балансировка, таймауты и очередь запросов
  • 5. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Starter Kit Feature List ● Автороутинг API и поддержка HTTP(S), WS(S) ● Подгрузка изменений на лету через fs.watch ● Загрузчик конфигурации и Graceful shutdown ● Утилизация CPU, кластеризация через потоки ● Слой доступа к данным DAL: Postgresql ● Сессии с сохраняемым состоянием ● Песочницы, потоки, масштабирование, тесты
  • 6. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Node.js in 2020 State of the platform and future
  • 7. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js уже 10 лет: v0.0.1 — 27 мая 2019 0.10.x и 0.12.x — (2013 - 2016) Io.js 1.x, 2.x, 3.x — (2014 - 2015) Argon 4.x (2015 - 2018), 5.x (2015 - 2016), Boron 6.x (2016 - 2019), 7.x (2016 - 2017), Carbon 8.x (2017 - 2019), 9.x (2017 - 2018), Dubnium 10.x (2018 - 2021),11.x (2018 - 2019), Erbium 12.x (2019 - 2022), 13.x (to June 2020) 14.x (April 2020 - April 2023), 15.x(2020-)
  • 8. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js features 8.x V8 6.0, async/await, TurboFan and Ignition 10.x V8 6.6, HTTP/2, fs.promises, BigInt, npm 6 12.x V8 7.8, TLS 1.3, OpenSSL 1.1.1c, npm 6.10.3 js: #, static, async/await, async stack, динамическая куча, llhttp и llparser, threads, DOS в HTTP/2, startup, fs.rmdir & fs.Dir, process.resourceUsage()
  • 9. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js features 13.x V8 7.8, npm 6.13.6, libuv 1.34.1 WASI, worker.resourceLimits, vm.Module Source map, Advanced Serialization API 14.x Ожидания: V8 8.x: больше доступа к v8 api HTTP/3 (HTTP over IETF QUIC) улучшения в WASI, N-API, async_hooks streams, в работе с workers и esm
  • 10. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Shared memory and Atomics Появилось в Node.js 9 ■ SharedArrayBuffer ■ Atomics ○ add, sub, and, or, xor ○ store, load, exchange, compareExchange ○ notify, wait, wake (deprecated)
  • 11. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Threads vs Processes process process JavaScript thread V8libuv node.js JavaScript thread V8 libuv node.js JavaScript thread V8 libuv node.js IPC
  • 12. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Why Isolation? ● Ошибки ● Утечки памяти и других ресурсов ● Приложение: данные, соединения с БД ● Файловая система и корневой каталог ● Окружение ОС, PID, IPC ● Безопасность ОС: пользователи, группы ● Сеть: дескрипторы сокетов, порты, хосты
  • 13. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Execution Strategy Problems ● Недостаточная изоляция исполнения запросов к серверу друг от друга ● Один неудачный запрос может убить все параллельно исполняемые ● В асинхронной среде сложно найти и связать ошибку с запросом ● Изоляция приложений и организаций в SaaS
  • 14. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Execution Isolation ● VPS (виртуальная машина) ● Контейнер (Docker) ● Провесс (node) ● Поток (встроенный модуль worker_threads) ● Песочница (vm.createContext, vm.Script) ● Программная абстракция (объект или замыкание)
  • 15. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Links Node https://nodejs.org/en/about/releases/ https://nodejs.org/en/blog/ https://node.green/ Deno https://github.com/denoland/deno https://youtu.be/z6JRlx5NC9E
  • 16. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Deno ● Безопасность: файловая система, сеть, окружение ● V8, TypeScript ● Rust вместо C++ ● Tokio (event loop, I/O scheduler) ● Встроенный менеджер пакетов
  • 17. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Node.js Готовность ноды для серьезных систем Проблемы ноды ● Безопасность, заражения, зависимости ● Потерянные ошибки, утечки, перезапуски ● Асинхронность и стектрейс Перспективы платформы
  • 18. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) v8 Serialization API v8.serialize, v8.deserialize v8.Serializer, v8.Deserializer
  • 19. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Race Condition const v8 = require('v8'); const dataset = [ { name: 'Marcus Aurelius', born: 121 }, { name: 'Mao Zedong', born: 1893 }, ]; const v8Data = v8.serialize(dataset); const obj = v8.deserialize(v8Data);
  • 20. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c v8 Serialization
  • 21. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) vm Sandboxing vm.Script, vm.runInContext and v8::Context
  • 22. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.createContext const vm = require('vm'); const sandbox = { console: new Logger(), require: wrap(require), application: new Application(), }; sandbox.global = sandbox; vm.createContext(sandbox);
  • 23. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.Script const vm = require('vm'); const fs = require('fs'); const code = await fs.readFile(fileName, 'utf8'); const src = `'use strict';n context => ${code}`; const script = new vm.Script(src); script.runInContext(sandbox, { timeout: 5000 });
  • 24. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c vm.Script const options = { timeout: 5000, displayErrors: false, // default: true breakOnSigint: true, // default: false, CTRL+C }; script.runInContext(sandbox, options); const object = { /* global */ }; script.runInNewContext(object, options); script.runInThisContext(options);
  • 25. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) ES.Next ECMAScript 2020
  • 26. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c ES.Next features ● Приватные и статические поля ● Изменения в Array, Object, String ● Atomics и SheredArrayBuffer ● Коллекции Set, Map, WeakSet, WeakMap ● globalThis ● Math
  • 27. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Rest const f = (a, b, ...array) => {}; const g = ({ a, b, ...array }) => {}; const { name, ...rest } = obj; Spread f(a, b, ...array); const obj2 = { name, ...obj1 }; const clone = { ...obj };
  • 28. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Exponentiation Math.pow(x, y) x ** y x **= y x = x ** y Optional chaining const spqr = { emperor: { name: 'Marcus' } }; console.log(spqr.emperor?.name); console.log(spqr.president?.name);
  • 29. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Operators Exponentiation Math.pow(x, y) x ** y x **= y x = x ** y Optional chaining (still waiting v8 8.x in Node.js) const spqr = { emperor: { name: 'Marcus' } }; console.log(spqr.emperor?.name); console.log(spqr.president?.name);
  • 30. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Asynchronous iterable contract Symbol.iterator iterable[Symbol.iterator]() Symbol.asyncIterator asyncIterable[Symbol.asyncIterator]()
  • 31. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Try...catch try { throw new Error('message'); } catch { console.log('no arguments catched'); }
  • 32. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Function ((a, b) => { const c = a + b; // hello there return c; }).toString() "(a, b) => { const c = a + b; // hello there return c; }"
  • 33. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.finally new Promise(executor) .then(onFulfilled[, onRejected]) .catch(onRejected) .finally(onFinally);
  • 34. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled const p1 = Promise.resolve('p1'); const p2 = new Promise((resolve, reject) => { setTimeout(resolve, 1000, 'p2'); }); const p3 = new Promise((resolve, reject) => { setTimeout(reject, 100, 'p3'); }); Promise.all([p1, p2, p3]).then(values => { console.log(values); });
  • 35. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled Promise.all([p1, p2, p3]).then(values => { console.log(values); }); node:26549) UnhandledPromiseRejectionWarning: p3 (node:26549) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:26549) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
  • 36. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled const p1 = Promise.resolve('p1'); const p2 = new Promise((resolve, reject) => { setTimeout(resolve, 1000, 'p2'); }); const p3 = new Promise((resolve, reject) => { setTimeout(reject, 100, 'p3'); }); Promise.allSettled([p1, p2, p3]).then(values => { console.log(values); });
  • 37. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Promise.allSettled Promise.allSettled([p1, p2, p3]).then(values => { console.log(values); }); [ { status: 'fulfilled', value: 'p1' }, { status: 'fulfilled', value: 'p2' }, { status: 'rejected', reason: 'p3' } ]
  • 38. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c toString().padStart(width) : cell.padEnd(width); }).join(''))).join }; const proportion = (max, val) => Math.round(val * 100 / max); co calcProportion = table => { table.sort((row1, row2) => row2[DENSITY row1[DENSITY_COL]); const maxDensity = table[0][DENSITY_COL]; table forEach(row => { row.push(proportion(maxDensity, row[DENSITY_COL])) return table; }; const getDataset = file => { const lines = fs.read FileSync(file, 'utf8').toString().split('n'); lines.shift(); lines return lines.map(line => line.split(',')); }; const main = compose (getDataset, calcProportion, renderTable); const fs = require('fs' compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x); con DENSITY_COL = 3; const renderTable = table => { const cellWidth = [ 8, 8, 18, 6]; return table.map(row => (row.map((cell, i) => { const = cellWidth[i]; return i ? cell.toString().padStart(width) : cell.p (width); }).join(''))).join('n'); }; const proportion = (max, val) Состояние гонки В параллельном и асинхронном программировании
  • 39. Web Locks API in node.js & browser Timur Shemsedinov Chief Technology Architect at Metarhia Lecturer at KPI
  • 40. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Why do we need Web Locks API ? — Do you know what is mutex, locks, critical section, race condition, parallel programming at all? — Congrats! It’s is very likely that all your JavaScript code broken )))
  • 41. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Concurrent Computing
  • 42. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Concurrency Problems ● Race condition ● Deadlock ● Livelock ● Resource starvation ● Resource leaks
  • 43. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Synchronization Primitives Semaphore Binary semaphore Counting semaphore Condition variable Spinlock Mutex Timed mutex Shared mutex Recursive mutex Monitor Barrier
  • 44. const fs = require('fs'); const compose = (...funcs) => x => funcs. reduce((x, fn) => fn(x), x); const DENSITY_COL = 3; const renderTab table => { const cellWidth = [18, 10, 8, 8, 18, 6]; return table.ma => (row.map((cell, i) => { const width = cellWidth[i]; return i ? c Links Spec: wicg.github.io/web-locks MDN: developer.mozilla.org/en-US/docs/Web/API/Web_Locks_API Implementation: github.com/metarhia/web-locks Examples: github.com/HowProgrammingWorks/RaceCondition github.com/HowProgrammingWorks/Semaphore github.com/HowProgrammingWorks/Mutex Async prog: habr.com/ru/post/452974/
  • 46. github.com/tshemsedinov https://youtube.com/TimurShemsedinov github.com/HowProgrammingWorks/Index Весь курс по ноде (>35.5 часов) https://habr.com/ru/post/485294/ t.me/HowProgrammingWorks t.me/NodeUA [email protected]