Shakras and Hot Stone Therapy (SHST)Shakras and Hot Stone Therapy (SHST)

Modern techniques for relaxation using ancient methodsModern techniques for relaxation using ancient methods

(a hands-on approach)(a hands-on approach)

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Server Architectures with NodeServer Architectures with Node

Why should the browser folk have all the fun?Why should the browser folk have all the fun?

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Your friendly presenterYour friendly presenter

Jeffrey Labonskijlabonski@chariotsolutions.comConsultant, Chariot SolutionsSomewhat Recent Javascript Convert

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Javascript Convert?Javascript Convert?

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Javascript Convert?Javascript Convert?

Actually, yesActually, yes

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However, there's beauty in thereHowever, there's beauty in there

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However, there's beauty in thereHowever, there's beauty in there

This may take a bit of time to �nd.This may take a bit of time to �nd.

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E�cient use of resources makes me happy.E�cient use of resources makes me happy.

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E�cient use of resources makes me happy.E�cient use of resources makes me happy.

(hapi?)

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This thing is This thing is thinthin

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Customer production server from pm2:

$ pm2 status │ SERVER (PROD) │ online | 12D │ 0% │ 148.7 MB |

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Customer production server from pm2:

12 days of uptime12 days of uptime

$ pm2 status │ SERVER (PROD) │ online | 12D │ 0% │ 148.7 MB |

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Customer production server from pm2:

12 days of uptime12 days of uptime

150MB of RAM!150MB of RAM!

$ pm2 status │ SERVER (PROD) │ online | 12D │ 0% │ 148.7 MB |

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java -Xmx4G -Xms4G -jar app.jar

:: Spring Boot :: (v2.0.3.RELEASE) Started TestApp in 24.351 seconds (JVM running for 24.811)

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Single threadedSingle threaded

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Code isomorphism between client and serverCode isomorphism between client and server

If you use JS on the client...If you use JS on the client...

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Fun to write, to be honestFun to write, to be honest

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JS is a gateway drug to LambdaJS is a gateway drug to Lambda

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Node architecture makes me happyNode architecture makes me happy

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Node architecture makes me happyNode architecture makes me happy

(hapi?)

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Node was born from two neat pieces ofNode was born from two neat pieces oftechnologytechnology

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Node was born from two neat pieces ofNode was born from two neat pieces oftechnologytechnology

libuvlibuv

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Node was born from two neat pieces ofNode was born from two neat pieces oftechnologytechnology

libuvlibuv

v8v8

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v8v8 & & shakrashakra

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libuvlibuv

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Only a matter of timeOnly a matter of time

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What, exactly, is it good for?What, exactly, is it good for?

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IOIO

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IOIO

Like, Like, tonstons of IO of IO

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Try not to do too muchTry not to do too much

All CPU use on node is crimethinkAll CPU use on node is crimethink

Get in, get outGet in, get out

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A humorous vingette...A humorous vingette...

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bcrypt(3)bcrypt(3)!!!!!!!!!!

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WARNING:WARNING:

Handrails are not availableHandrails are not available

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There really is only one real method in nodeThere really is only one real method in nodethat matters.that matters.

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There really is only one real method in nodeThere really is only one real method in nodethat matters.that matters.

on()on()

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Looks familiar?Looks familiar?

server.on('request', (req, res) => { // node HTTP server }) observer.subscribe((x) => { // Angular HttpClient })

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The fundamental unit of javascript is theThe fundamental unit of javascript is thecontinuationcontinuation..

Javascript is a Javascript is a continuation orientedcontinuation orientedlanguage.language.

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whenItIsDone(thing, (result) => { doSomethingElse(result) })

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const fs = require('fs') fs.readFile('./foo.txt', 'utf8', (err, contents) => { console.log(contents) });

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The The continuationcontinuation is a lambda is a lambda

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The The continuationcontinuation is a lambda is a lambda

It executes later.It executes later.

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The The continuationcontinuation is a lambda is a lambda

It executes later.It executes later.

You can never get here from there.You can never get here from there.

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(err, contents) => { console.log(contents) });

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fs.readFile('./foo.txt', 'utf8', (err, contents) => { console.log(contents) }); fs.readFile('./bar.txt', 'utf8', (err, contents) => { console.log(contents) });

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This is the beauty of nodejsThis is the beauty of nodejs

Handle your result Handle your result

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This is the beauty of nodejsThis is the beauty of nodejs

Handle your result Handle your result laterlater

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Man, it can get ugly fastMan, it can get ugly fast

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const fs = require('fs') const dns = require('net') fs.readFile('./foo.txt', 'utf8', (err, contents) => { fs.writeFile('./bar.txt', 'utf8', (err, contents) => { dns.lookup(contents, (err, address, family) => { console.log(address) }) }) })

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do(foo, bar => { some(bar, baz => { thing(baz, quux => { complex(quux, quuz => { eventually(quuz, waldo => { go(waldo, fred => { crazy(fred, thud => { console.log(thud) }) }) }) }) }) }) })

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Promises are syntactic sugarPromises are syntactic sugar

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do(foo) .then(bar => { some(bar) }).then(baz => { thing(baz) }).then(quux => { complex(quux) }).then(quuz => { eventually(quuz) }).then(waldo => { go(waldo) }).then(fred => { crazy(fred) }).then(thud => { console.log(thud)

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asyncasync / / awaitawait are the new hotness are the new hotness

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try{ const bar = await do(foo) const baz = await some(bar) const quux = await thing(baz) const quuz = await complex(quux) const waldo = await eventually(quuz) const fred = await go(waldo) const thud = await crazy(fred) console.log(thud) }catch(err){ // whoops }

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const p = do(foo); const bar = await p;

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const util = require('util') const readFileAsync = util.promisify(fs.readFile) const contents = await readFileAsync('./foo.txt', 'utf8')

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const f = (a, b) => { return a + b } const p = f('a', ?) assert(p('b') === 'ab')

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Let's do some actual Let's do some actual workwork..

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REST serversREST servers

ExpressHAPIRestifyLoopbackSails... probably a baker's dozen more by now

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Express.js is the gold standardExpress.js is the gold standard

Does whatcha needDoes whatcha need

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const express = require('express') const app = express() const port = 80 app.get('/', (req, res) => res.send('Hello World!')) app.listen(port, () => console.log(`Example app listening on por

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C'mon get HAPIC'mon get HAPI

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git@bitbucket.org:chariotspaday/server.gitgit@bitbucket.org:chariotspaday/server.git

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Things to likeThings to like

In this desolate wasteland of In this desolate wasteland of ~0.0.9~0.0.9

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Vibrant plugins, easy API to write your ownVibrant plugins, easy API to write your own

goodboomnescon�dencepoopbellblipp

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server.route({ method: 'GET', path: '/', handler: function (request, h) { return 'Hello!' } })

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hapi ❤ joihapi ❤ joi

const session = joi.object().keys({ id: joi.number().integer().min(1).required(), name: joi.string().trim(true).min(1).required(), date: joi.string().trim(true).isoDate().required() })

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method: 'GET', options: { tags: ['api'], description: 'Gets all subscriptions for a session', path: '/session/{id}/subscriptions', validate: { params: { id: joi.number().integer().min(1) } },

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response: { options: { abortEarly: false }, sample: 100, schema: joi.array().items(joiSchemas.registration) }

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"/api/session": { "get": { "responses": { "default": { "description": "", "schema": { "type": "array", "items": { "$ref": "#/definitions/IdNameDateModel" } } } }, "produces": ["application/json"], "tags": ["api"],

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Stupid node tricks with hapi, express, andStupid node tricks with hapi, express, andwebsocketswebsockets

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const hapi = require('hapi') const ws = require('ws') const server = new hapi.Server({port: 8000}) const listener = server.listener const wss = new WebSocket.Server({ server: listener, path: '/api/chat' }) await server.start()

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this._removeListeners = addListeners(this._server, { listening: this.emit.bind(this, 'listening'), error: this.emit.bind(this, 'error'), upgrade: (req, socket, head) => { this.handleUpgrade(req, socket, head, (ws) => { this.emit('connection', ws, req); }); } });

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server.events.on('log', (event, tags) => { server.events.on('request', (request, event, tags) => { server.events.on('response', (request) => {

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Takeaway (whew!)Takeaway (whew!)

Understand on()Grok continuations, how code moves through nodeNever eat CPU.Use cool language featuresBe Javascripty on the server

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