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Node 2018
2018/11/23 @ HTML5j
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Twitter: @yosuke_furukawa
Github: yosuke-furukawa
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Node.js v11 released!!!
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Node.js Core Policy
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Node.js Core Policy
small core, less is more
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Less is More
Focusing on Stability,
Security, Performance
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Stability
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Stability (Node.js Core)
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Long Term Support Ͱෆ۩߹2ؒमਖ਼͞ΕΔ
·ͨɺηΩϡϦςΟ͞Βʹ3ؒमਖ਼͞ΕΔ
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—
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—
V8 Node.js ඇޓͷमਖ਼Λ͢Δͱ͖ࣄલʹ
௨͢Δɻ
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V8͕ࣗNodeΛforkͯ͠࠷৽ΞοϓσʔτΛͯ͠
ςετյΕͳ͍͜ͱΛอূͯ͠Δɻ
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ຖPRຖʹCIͰςετ͢ΔͷͪΖΜɺશCPUɾϓ
ϥοτϑΥʔϜͰϏϧυͯ͠͏·͍͘͘͜ͱΛ֬ೝ͢Δɻ
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ͨ·ʹյΕΔςετ (flaky test) ʹؔͯ͠Ͳͷϓϥο
τϑΥʔϜͰى͖Δ͔ௐࠪ͠ɺमਖ਼͍ͯ͘͠ྲྀΕ
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Stability (Node.js
Application)
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CPUɾϝϞϦͷϓϩϑΝΠϥʔ͕͋Γɺ͜ΕΛ͏ͱ
ϘτϧωοΫΛௐࠪͰ͖Δɻ
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No content
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Performance
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Performance priority is high
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ඞͣఆظతʹbenchmarkΛऔಘ͠ɺ͘ͳͬͯͳ͍͜
ͱΛௐࠪ͢Δɻ
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ϚΠΫϩϕϯνϚʔΫ͚ͩͰͳ͘ɺExpressΛͬͨ
͋ΔఔͷنͷΞϓϦͰςετ͢Δɻ
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keep v8 fresh
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v8 ͷόʔδϣϯϝδϟʔ
όʔδϣϯϦϦʔε࣌·Ͱͷ
Stable Chrome ʹར༻͞Εͯ
Δv8Λར༻ɻ
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ʢ༨ஊʣͳͷͰɺ࣮ES
unshippedͷػೳͱ͔͑Δ
ʢv11ͩͱprivate fieldͱ͔
BigIntͱ͔ʣ
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Worker
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Worker
• Thread Λ͑ΔΑ͏ʹ͢ΔͨΊͷͷɻ
• Node.js Ͱ multi thread ϓϩάϥϛϯά͕Ͱ
͖Δʢ͍ͭʹʣ
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Worker
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Worker
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ͪͳΈʹ࠷ۙೖͬͨ
llhttpͱ͍͏ύʔα͕͍
(·ͩexperimental)
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llhttp Node.js v11.2͔Βೖͬͨ
৽͍͠ύʔα
$ node --experimental-
http-parser test.js
# Ͱ࣮ߦՄೳɻ
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͕͍͜͜Αllhttp
• TypeScript ͔Β LLVM bitcodeੜ͢Δɻϥούʔ
Λॻ͍ͯC͔ΒݺΔΑ͏ʹ͍ͯ͠Δɻ
• (ී௨(?) C͔ΒLLVMʹͯ͠WASMʹͯ͠JSͰݺΔ
Α͏ʹ͍ͬͯ͏ٯͷΞϓϩʔνΛऔΓͦ͏͕ͩɺ
TypeScript(JS)͔ΒLLVM bitcodeੜͯ͠ɺCͷϥ
ΠϒϥϦͱͯ͠ݺΔΑ͏ʹͨ͠ͱ͍͏ॴ͕͍
Μ͚ͩͲɺҰ୴͞ॻ͖͖Εͳ͍ɻɻɻ)
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llhttp performance
ഒ͘Β͍ૣ
͍ʢͳ͔ͥʣ
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Security
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Security (Node Core)
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Node.jsࣗͷηΩϡϦςΟ੬
ऑੑTSCͰඞͣ͞ΕͯΔɻ
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͍ͭ࠷ۙ͋ͬͨϦϦʔεɺOpenSSLͷ੬ऑੑ͕ൃݟ͞
ΕͨͷͰύονόʔδϣϯͰશମʹల։ɻ
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Security Release੬ऑੑ͕ใ
ࠂ͞ΕΔʹमਖ਼ύον͕࡞Β
Εͯใࠂ͞ΕΔΑ͏ʹͳͬͯΔ
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Security (Ecosystem)
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npm audit ੬ऑੑ͕ใࠂ͞ΕͯΔϥΠϒϥϦ͕
ࣗͷύοέʔδʹଘࡏ͢Δ͔Λௐࠪͯ͘͠ΕΔػೳ
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ͪͳΈʹ yarn ʹ audit Ճ͞ΕͯΔʢsnyk.io ͱ
͍͏σʔλϕʔεͰnpmͷ੬ऑੑσʔλϕʔεͱҧ͏
͕ʣ
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Less is More ͰػೳՃ͠
ͳ͍ͱݴͬͯྫ֎͋Δɻ
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Web Standards
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Why Node needs web standard?
James Snell @ NodeFest 2016
Node.js is, and has been, primarily a
platform for Web Application Development
While Node.js presumes a "small core"
philosophy for most things, it includes
support for the most basic and
critical internet standards
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Node.js v10.0.0 ~ v10.12.0
• HTTP/2
• ES Modules
• Promise in node core
• Stream/Promisesͷੑվળ
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Node.js v11
• url module ͕ deprecated ʹͳΓɺ WHATWG
URL Λར༻͢ΔΑ͏ʹ෦վળ͕ߦΘΕͨ
• WHATWG TextEncoder/TextDecoder͕global
ʹͳͬͨ
• queueMicrotask API ͕࣮ݧతʹՃ͞Εͨ
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http2
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Multiplexing requests on 1 TCP
connection
4FSWFS
5$1$POOFDUJPOCVUNVMUJ
SFRVFTUT
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Multiplexing requests on 1 TCP
connection
4FSWFS
*GTPNFSFRVFTUTBSFTMPX
#65
XIPMFSFRVFTUTBSFOPUB⒎FDUFE
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)551
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)551
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ES Modules
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ES Modules
import { readFile } from 'fs';
readFile('./foo.txt', (err, source) => {
if (err) {
console.error(err);
} else {
console.log(source);
}
});
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ES Modules
import { readFile } from 'fs';
readFile('./foo.txt', (err, source) => {
if (err) {
console.error(err);
} else {
console.log(source);
}
});
JNQPSUͰಡΈࠐΊΔ
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ES Modules
• ·ͩ Experimental ͕ͩɺ commonjs es modules
૬ޓӡ༻Ͱ͖ΔܗͰ࣮͞ΕͯΔɻ
• ͨͩ `.mjs` ͱ͍͏֦ுࢠ͕ඞཁʹͳΔʢࢼݧతͳ
ͷʣ
• ࠓ nodejs/modules Ͱٞத
• https://github.com/nodejs/modules
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Promise in Node core
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Promise in Node Core
• ͦͦ Node.js ʹඇಉظॲཧͷΓํ͕ෳଘࡏ͢Δɻ
• Callback
• Promise
• Stream
• WebͰPromise͕΄΅ඪ४తͳҐɺ͜Εʹ߹Θͤͯ
Promiseͱ૬ޓӡ༻Ͱ͖ΔΑ͏ʹ͍ͯ͘͠ྲྀΕɻ
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util.promisify
const util = require('util');
const dns = require('dns');
// Promise Խ͞ΕͨؔΛऔΕΔɻ
const lookup =
util.promisify(dns.lookup);
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fs.promises
const fs = require('fs');
async function main() {
// fs.promises͔ΒॲཧΛ࣮ߦ
const content = await
fs.promises.readFile("./foo.txt");
console.log(content.toString());
}
main();
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fs.promises
const fs = require('fs');
async function main() {
// fs.promises͔ΒॲཧΛ࣮ߦ
const content = await
fs.promises.readFile("./foo.txt");
console.log(content.toString());
}
main();
GTQSPNJTFTʹSFBE'JMFͰ$BMMCBDLͰͳ
͘1SPNJTFΛฦ͢Α͏ʹͳΔɻ
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fs.promises
• ͜Ε·ͩExperimental
• Promise͕Web։ൃऀʹͱͬͯੑ͕ߴ
͘ɺχʔζڧ͍ͷͰՃ͞Εͨɻ
• httpͳͲͷଞͷAPI·ͩ
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Stream/Promiseͷੑվળ
• for await of Ͱ Stream Λஞ࣍ॲཧͰ͖ΔΑ͏
ʹͳͬͨ
• Node v10 ͔Β Stream ʹՃ͞Εͨ finished,
pipeline API͕ Promiseͱͷੑߴ͍
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for await of ͷվળ
const fs = require('fs');
async function print(readable) {
readable.setEncoding('utf8');
let data = '';
// for await ۟Ͱiterateͭͭ͠ɺchunkΛऔΓग़͢
for await (const k of readable) {
data += k;
}
console.log(data);
}
print(fs.createReadStream('file')).catch(console.log);
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Stream finished API
const fs = require('fs');
const { finished } = require('stream');
const rs = fs.createReadStream('./stream.js');
//finished API ͰΤϥʔऴྃɺਖ਼ৗऴྃʹ͔͔ΘΒͣऴྃͨ͠ΒίʔϧόοΫΛݺΔɻ
finished(rs, (err) => {
if (err) {
console.error('Stream failed', err);
return;
}
console.log('Stream is done reading');
});
rs.resume();
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Stream finished API
const fs = require('fs');
const util = require('util');
const stream = require('stream');
// Promisify ΛͬͯcallbackΛpromiseʹ͢Δ
const finished = util.promisify(stream.finished);
const rs = fs.createReadStream('./stream.js');
// async await ͕͑Δ
async function run() {
await finished(rs);
console.log('Stream is done reading');
}
run().catch((err) => console.error('Stream failed', err));
rs.resume();
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Stream Pipeline API
const fs = require('fs');
const rs = fs.createReadStream('error.txt');
const ws = fs.createWriteStream('output.txt');
rs.pipe(ws).on("error", (e) => {
// ͜͜Ͱ౷ҰతʹΤϥʔΛϋϯυϦϯά͍͕ͨ͠ɺ
// readstreamͰΤϥʔʹͳΔͱ͜͜ʹདྷͳ͍ɻ
// ͜͏ͬͯॻ͔ͳ͍͚ͯ͘ͳ͍
// rs.on("error", errorHandler).pipe(ws).on("error", errorHandler)
});
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Stream Pipeline API
const { pipeline, Transform } = require('stream');
const rs = fs.createReadStream('./stream.js');
const ts = new Transform({
transform(chunk, encoding, callback) {
callback(null, chunk.toString().toUpperCase())
}
});
const ws = fs.createWriteStream('./stream_cap.js');
pipeline(rs, ts, ws, (err) => {
if (err) {
console.error(err);
return;
}
console.log('Stream is done reading');
});
rs.resume();
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Stream Pipeline API
const { pipeline, Transform } = require('stream');
const p = util.promisify(pipeline);
const rs = fs.createReadStream('./stream.js');
const ts = new Transform({
transform(chunk, encoding, callback) {
callback(null, chunk.toString().toUpperCase())
}
});
const ws = fs.createWriteStream('./stream_cap.js');
// promisify ͔ͯ͠Β async-awaitͰ͖Δ
async function run() {
await p(rs, ts, ws);
console.log('Stream is done reading');
}
run().catch(console.error);
rs.resume();
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Stream/Promiseͷੑվળ
• Stream => Promise
• Promise => Stream
• ͷͲͪΒͰӡ༻Ͱ͖ΔΑ͏ʹͳͬͨɻ
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Node.js Future ~~~
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Node.js Big News!!!
• Node.js Foundation and JS Foundation intent
to create joint organization.
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Node.js Big News!!!
• Node.js Foundation and JS Foundation intent
to create joint organization.
Node.js Foundation ͱ JS Foundation ౷߹
͞ΕͯɺҰͭʹͳΔͷΛࢦ͢ɻ
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Unified JavaScript Platform
W3C / WHATWG Node.js
ECMA
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Unified JavaScript Platform
W3C / WHATWG Node.js
ECMA
W3C/WHATWG ͷ Web API ͱ Node.js API
ঃʑʹد͍ͤͯ͘ɻ͞ΒʹECMAScript͕
ͦͷඪ४ΛதԝͰݻΊ͍ͯ͘ɻ
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Example
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Unified JavaScript Platform
• Web API Node.js API ECMAScript ٻΊͯ
͍Δͷ "Ϣʔεέʔε"
• ͞ΒʹWeb API Node API ECMAScriptશ
෦ؙͬͱ͍ͬͯΔͷ༷ࡦఆऀΑΓ։ൃऀ
• ։ൃऀଆɺͭ·ΓΒ͕ϢʔεέʔεΛ࡞͍͖ͬͯɺ
༷ࡦఆऀଆʹϑΟʔυόοΫ͍ͯ͘͠ඞཁ͕͋Δɻ
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Unified JavaScript Platform
• Web API Node.js API ECMAScript ٻΊͯ
͍Δͷ "Ϣʔεέʔε"
• ͞ΒʹWeb API Node API ECMAScriptશ
෦ؙͬͱ͍ͬͯΔͷ༷ࡦఆऀΑΓ։ൃऀ
• ։ൃऀଆɺͭ·ΓΒ͕ϢʔεέʔεΛ࡞͍͖ͬͯɺ
༷ࡦఆऀଆʹϑΟʔυόοΫ͍ͯ͘͠ඞཁ͕͋Δɻ
Ϧʔυ͍ͯ͘͠ͷ༷ࡦఆऀ͚ͩͰͳ
͘ɺզʑͰ͢ɻ
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Thank you