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fix(gatsby-plugin-offline): fix certain resources being cached excessively #9923

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merged 6 commits into from
Nov 14, 2018
Merged

fix(gatsby-plugin-offline): fix certain resources being cached excessively #9923

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23599eb
Backport fixes from #9907
Nov 14, 2018
e02f9d5
minor fixes for things I copy-pasted wrong
Nov 14, 2018
fdd5844
Reorder onload / appendChild
Nov 14, 2018
14cdb95
Remove links if an error occurs
Nov 14, 2018
ff6ca9b
Add cacheFirst handler for hashed resources + make RegExps consistent
Nov 14, 2018
b25b07b
Update README
Nov 14, 2018
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21 changes: 14 additions & 7 deletions packages/gatsby-plugin-offline/README.md
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Expand Up @@ -49,18 +49,25 @@ const options = {
navigateFallbackWhitelist: [/^([^.?]*|[^?]*\.([^.?]{5,}|html))(\?.*)?$/],
navigateFallbackBlacklist: [/\?(.+&)?no-cache=1$/],
cacheId: `gatsby-plugin-offline`,
// Don't cache-bust JS or CSS files, and anything in the static directory
dontCacheBustUrlsMatching: /(.*\.js$|.*\.css$|\/static\/)/,
// Don't cache-bust JS or CSS files, and anything in the static directory,
// since these files have unique URLs and their contents will never change
dontCacheBustUrlsMatching: /(\.js$|\.css$|\/static\/)/,
runtimeCaching: [
{
// Add runtime caching of various page resources.
urlPattern: /\.(?:png|jpg|jpeg|webp|svg|gif|tiff|js|woff|woff2|json|css)$/,
// Use cacheFirst since these don't need to be revalidated (same RegExp
// and same reason as above)
urlPattern: /(\.js$|\.css$|\/static\/)/,
handler: `cacheFirst`,
},
{
// Add runtime caching of various other page resources
urlPattern: /^https?:.*\.(png|jpg|jpeg|webp|svg|gif|tiff|js|woff|woff2|json|css)$/,
handler: `staleWhileRevalidate`,
},
{
// Use the Network First handler for external resources
urlPattern: /^https?:/,
handler: `networkFirst`,
// Google Fonts CSS (doesn't end in .css so we need to specify it)
urlPattern: /^https?:\/\/fonts\.googleapis\.com\/css/,
handler: `staleWhileRevalidate`,
},
],
skipWaiting: true,
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19 changes: 13 additions & 6 deletions packages/gatsby-plugin-offline/src/gatsby-browser.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,13 +21,12 @@ exports.onServiceWorkerActive = ({
// grab nodes from head of document
const nodes = document.querySelectorAll(`
head > script[src],
head > link[as=script],
head > link[rel=stylesheet],
head > link[href],
head > style[data-href]
`)

// get all resource URLs
const resources = [].slice
const headerResources = [].slice
.call(nodes)
.map(node => node.src || node.href || node.getAttribute(`data-href`))

Expand All @@ -40,8 +39,16 @@ exports.onServiceWorkerActive = ({
)
)

serviceWorker.active.postMessage({
api: `gatsby-runtime-cache`,
resources: [...resources, ...prefetchedResources],
const resources = [...headerResources, ...prefetchedResources]
resources.forEach(resource => {
// Create a prefetch link for each resource, so Workbox runtime-caches them
const link = document.createElement(`link`)
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Isn't it possible that we're duplicating a prefetch here? i.e. head > link[href] could match

<link rel="prefetch" href="/static/d/368/path---showcase-c-41-46f-ykWCDEvUZCguGaUYZsNI5k1Io.json">

and we'd create another prefetch link. Is that OK?

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Yes, this is expected behaviour - we need to "prefetch" after the SW has activated, so that Workbox can cache the responses.

link.rel = `prefetch`
link.href = resource

link.onload = link.remove
link.onerror = link.remove

document.head.appendChild(link)
})
}
21 changes: 14 additions & 7 deletions packages/gatsby-plugin-offline/src/gatsby-node.js
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Expand Up @@ -91,18 +91,25 @@ exports.onPostBuild = (args, pluginOptions) => {
navigateFallbackWhitelist: [/^([^.?]*|[^?]*\.([^.?]{5,}|html))(\?.*)?$/],
navigateFallbackBlacklist: [/\?(.+&)?no-cache=1$/],
cacheId: `gatsby-plugin-offline`,
// Don't cache-bust JS or CSS files, and anything in the static directory
dontCacheBustUrlsMatching: /(.*\.js$|.*\.css$|\/static\/)/,
// Don't cache-bust JS or CSS files, and anything in the static directory,
// since these files have unique URLs and their contents will never change
dontCacheBustUrlsMatching: /(\.js$|\.css$|\/static\/)/,
runtimeCaching: [
{
// Add runtime caching of various page resources.
urlPattern: /\.(?:png|jpg|jpeg|webp|svg|gif|tiff|js|woff|woff2|json|css)$/,
// Use cacheFirst since these don't need to be revalidated (same RegExp
// and same reason as above)
urlPattern: /(\.js$|\.css$|\/static\/)/,
handler: `cacheFirst`,
},
{
// Add runtime caching of various other page resources
urlPattern: /^https?:.*\.(png|jpg|jpeg|webp|svg|gif|tiff|js|woff|woff2|json|css)$/,
handler: `staleWhileRevalidate`,
},
{
// Use the Network First handler for external resources
urlPattern: /^https?:/,
handler: `networkFirst`,
// Google Fonts CSS (doesn't end in .css so we need to specify it)
urlPattern: /^https?:\/\/fonts\.googleapis\.com\/css/,
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Maybe just use a regex like in this recipe? https://gist.github.com/addyosmani/0e1cfeeccad94edc2f0985a15adefe54#cache-all-google-fonts-requests-up-to-a-maximum-of-30-cache-entries

Also from what I understand, staleWhileRevalidate will request both cache/network each time, and then update the cache on success.

It seems reasonable that something like google fonts can hit the cache first, then the network if that fails? What do you think?

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@valin4tor valin4tor Nov 14, 2018 •
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staleWhileRevalidate in the Workbox config is equivalent to the CacheFirst strategy when calling Workbox APIs directly, so the current config actually does what you've described (except for the max 30 entries). I was wrong, staleWhileRevalidate checks the cache first but then checks the network in the background, even if the cache was successful. woff2 and other font files from Google (or any domain) are covered by the first regex, which matches common extensions (and now works for external resources due to the added ^https?:.* at the start).

Also, since the linked code calls Workbox APIs directly, we'd have to move it to sw-append.js, which means it can't be customised by the user - so I think it's best to leave it user configurable. Basically Workbox generates similar code by reading the config - sw-append.js is for extra stuff which we can't do with the config.

handler: `staleWhileRevalidate`,
},
],
skipWaiting: true,
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30 changes: 1 addition & 29 deletions packages/gatsby-plugin-offline/src/sw-append.js
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Original file line number Diff line number Diff line change
@@ -1,29 +1 @@
/* global workbox */

self.addEventListener(`message`, event => {
const { api } = event.data
if (api === `gatsby-runtime-cache`) {
const { resources } = event.data
const cacheName = workbox.core.cacheNames.runtime

event.waitUntil(
caches.open(cacheName).then(cache =>
Promise.all(
resources.map(resource => {
let request

// Some external resources don't allow
// CORS so get an opaque response
if (resource.match(/^https?:/)) {
request = fetch(resource, { mode: `no-cors` })
} else {
request = fetch(resource)
}

return request.then(response => cache.put(resource, response))
})
)
)
)
}
})
// noop
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If we're no longer using this, do we even need this file at all?

Additionally, we probably can remove the appending stuff, as well.

gatsby/packages/gatsby-plugin-offline/src/gatsby-node.js

Line 125 in e02f9d5

fs.appendFileSync(`public/sw.js`, swAppend)

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I thought you would ask that question - I decided to leave it because I've added some new APIs to the same file in #9907, so there doesn't seem to be much point in removing it if we're only going to add it back again later.