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fetchのCancel Abort方法標準化の変遷 / A History of Cance...
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tipo159
March 29, 2018
Programming
1
510
fetchのCancel Abort方法標準化の変遷 / A History of Cancel Abort Method Standard
・Cancelable Promise
・AbortController
・Browserの対応状況
・Node.jsの対応状況
tipo159
March 29, 2018
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Transcript
fetchͷCancel/Abortํ๏ඪ४Խͷมભ Meguro.es #14 2018.3.29 tipo159
ΞδΣϯμ • Cancelable Promise (2015.4.10 - 2016.12.16) • AbortController (2017.1.5
- ) • BrowserͷରԠঢ়گ • Node.jsͷରԠঢ়گ 2
Cancelable Promise (2015.4.10 - 2016.12.16) • JavaScriptͷPromise༷ͷՃ • ओͳ༰ •
cancelΛresolve, rejectͱҧ͏ୈ3ͷঢ়ଶͱͯ͠Ճ • .NETͰΘΕ͍ͯͨCancel TokenΛͬͯΩϟϯηϧ • Domenic Denicola(Googleࣾһ)͕ɼ2016.12.16ʹGoogle ෦ͷରͷͨΊऔΓԼ͛(ৄࡉෆ໌) https://github.com/tc39/proposal-cancelable-promises 3
Cancelable Promiseͷαϯϓϧ async function f(cancelToken) { await a(); cancelToken.cancelIfRequested(); await
b(); } const ct = new CancelToken(cancel => { cancelButton.onclick = cancel; }); f(ct); // NOTE: will be canceled if they click the cancel button 4
AbortController (2017.1.5 - ) • ࠷ॳPromise༷ͷՃΛࢦ͍͕ͯͨ͠ɼDOM༷ ʹՃ͞Εͨ • ओͳ༰ •
AbortControllerΦϒδΣΫτΛͬͯΞϘʔτ • PromiseͷػೳՃͳ͠ • fetchҎ֎ʹద༻Մೳ • WHATWGͷDOM༷ʹՃࡁΈ https://dom.spec.whatwg.org/ 5
AbortControllerͷྫ var controller = new AbortController(); var signal = controller.signal;
var downloadBtn = document.querySelector('.download'); var abortBtn = document.querySelector('.abort'); downloadBtn.addEventListener('click', fetchVideo); abortBtn.addEventListener('click', function() { controller.abort(); console.log('Download aborted'); }); function fetchVideo() { ... fetch(url, {signal}).then(function(response) { ... }).catch(function(e) { reports.textContent = 'Download error: ' + e.message; }) } 6
BrowserͷରԠঢ়گ • αϙʔτࡁΈ • Chrome 66 • Edge 16 •
Firefox 57 • ະαϙʔτ • Safari (Technology Preview 42 2017.10.18ʙ ਖ਼ࣜαϙʔτະ) 7
Node.jsͷରԠঢ়گ • Node.jsʹDOMؔ࿈API͕ͳ͍ͨΊ༻ෆՄ • polyfillΛ͑༻Մೳ https://www.npmjs.com/package/abortcontroller-polyfill 8