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Add cookie-based cache with expiration (#1529)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| export default async function getSet(key, getter, expiration) { | ||
| const cache = await get(key); | ||
| if (cache === undefined) { | ||
| const value = getter(); | ||
| if (value !== undefined) { | ||
| await set(key, value, expiration); | ||
| return value; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export async function get(key) { | ||
| const value = await browser.runtime.sendMessage({ | ||
| key, | ||
| code: 'get-cache' | ||
| }); | ||
|
|
||
| // If it's not in the cache, it's best to return "undefined" | ||
| if (value === null) { | ||
| return undefined; | ||
| } | ||
| return value; | ||
| } | ||
|
|
||
| export function set(key, value, expiration /* in days */) { | ||
| return browser.runtime.sendMessage({ | ||
| key, | ||
| value, | ||
| expiration, | ||
| code: 'set-cache' | ||
| }); | ||
| } | ||
|
|
||
| /* Accept messages in background page */ | ||
| if (!browser.runtime.getBackground) { | ||
| browser.runtime.onMessage.addListener((request, sender, sendResponse) => { | ||
| if (!request) { | ||
| return; | ||
| } | ||
| const {code, key, value, expiration} = request; | ||
| if (code === 'get-cache') { | ||
| const [cached] = document.cookie.split('; ') | ||
| .filter(item => item.startsWith(key + '=')); | ||
|
|
||
| if (cached) { | ||
| const [, value] = cached.split('='); | ||
| sendResponse(JSON.parse(value)); | ||
| } else { | ||
| sendResponse(); | ||
| } | ||
| } else if (code === 'set-cache') { | ||
| // Store as JSON to preserve data type | ||
| // otherwise Booleans and Numbers become strings | ||
| document.cookie = `${key}=${JSON.stringify(value)}; max-age=${expiration ? expiration * 3600 * 24 : ''}`; | ||
| } | ||
| }); | ||
| } |