53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
/* global window, location */
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import fetch from 'unfetch'
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let evtSource
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export let currentPage
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let retryTimeout
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const retryWait = 5000
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export function setupPing (assetPrefix, pathnameFn, retry) {
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const pathname = pathnameFn()
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// Make sure to only create new EventSource request if page has changed
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if (pathname === currentPage && !retry) return
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// close current EventSource connection
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if (evtSource) {
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evtSource.close()
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}
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currentPage = pathname
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const url = `${assetPrefix}/_next/on-demand-entries-ping?page=${currentPage}`
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evtSource = new window.EventSource(url)
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evtSource.onerror = () => {
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retryTimeout = setTimeout(
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() => setupPing(assetPrefix, pathnameFn, true),
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retryWait
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)
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}
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evtSource.onopen = () => {
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clearTimeout(retryTimeout)
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}
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evtSource.onmessage = event => {
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try {
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const payload = JSON.parse(event.data)
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if (payload.invalid) {
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// Payload can be invalid even if the page does not exist.
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// So, we need to make sure it exists before reloading.
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fetch(location.href, {
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credentials: 'same-origin'
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}).then(pageRes => {
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if (pageRes.status === 200) {
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location.reload()
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}
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})
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}
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} catch (err) {
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console.error('on-demand-entries failed to parse response', err)
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}
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}
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}
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