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Optimize first request to Usher manifest

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younesaassila 2024-01-19 16:50:21 +01:00
parent 586bad2889
commit 87d063ae34
2 changed files with 27 additions and 7 deletions
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32
src/page/getFetch.ts
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@ -20,7 +20,7 @@ const NATIVE_FETCH = self.fetch;
export function getFetch(pageState: PageState): typeof fetch {
let usherManifests: UsherManifest[] = [];
let videoWeaverUrlsProxiedCount = new Map<string, number>(); // Used to count how many times each Video Weaver URL was proxied.
let fallbackProxiedCount = new Map<string, number>(); // Used to count how many times each Video Weaver URL was proxied.
let cachedPlaybackTokenRequestHeaders: Map<string, string> | null = null; // Cached by page script.
let cachedPlaybackTokenRequestBody: string | null = null; // Cached by page script.
@ -293,12 +293,29 @@ export function getFetch(pageState: PageState): typeof fetch {
// TODO: Use isRequestTypeProxied().
// TODO: Possible optimization: only proxy first request to weaver group (i.e. usher manifest).
// This is great for users using "Auto" quality.
// Flag first request to each Video Weaver URL.
const proxiedCount = videoWeaverUrlsProxiedCount.get(videoWeaverUrl) ?? 0;
let proxiedCount = 0;
if (manifest != null) {
proxiedCount =
videoWeaverUrl !== url
? manifest.replacementProxiedCount
: manifest.assignedProxiedCount;
} else {
proxiedCount = fallbackProxiedCount.get(videoWeaverUrl) ?? 0;
}
// Flag first request to each Usher manifest (fallback to Video Weaver URL).
if (proxiedCount < 1) {
videoWeaverUrlsProxiedCount.set(videoWeaverUrl, proxiedCount + 1);
if (manifest != null) {
if (videoWeaverUrl !== url) {
manifest.replacementProxiedCount += 1;
} else {
manifest.assignedProxiedCount += 1;
}
}
fallbackProxiedCount.set(
videoWeaverUrl,
(fallbackProxiedCount.get(videoWeaverUrl) ?? 0) + 1
);
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/PluralRules/PluralRules#using_options
const pr = new Intl.PluralRules("en-US", { type: "ordinal" });
const suffixes = new Map([
@ -378,6 +395,8 @@ export function getFetch(pageState: PageState): typeof fetch {
channelName,
assignedMap: assignedMap,
replacementMap: null,
assignedProxiedCount: 0,
replacementProxiedCount: 0,
consecutiveMidrollResponses: 0,
});
} else {
@ -385,7 +404,6 @@ export function getFetch(pageState: PageState): typeof fetch {
}
// Send Video Weaver URLs to content script.
const videoWeaverUrls = [...(assignedMap?.values() ?? [])];
videoWeaverUrls.forEach(url => videoWeaverUrlsProxiedCount.delete(url)); // Shouldn't be necessary, but just in case.
sendMessageToContentScript({
type: MessageType.UsherResponse,
channel: channelName,

2
src/page/types.ts
View File

@ -11,6 +11,8 @@ export interface UsherManifest {
channelName: string | null;
assignedMap: Map<string, string>; // E.g. "720p60" -> "https://video-weaver.fra02.hls.ttvnw.net/v1/playlist/..."
replacementMap: Map<string, string> | null; // Same as above, but with new URLs.
assignedProxiedCount: number; // Used to proxy only a certain amount of requests.
replacementProxiedCount: number; // Same as above, but with replacement URLs.
consecutiveMidrollResponses: number; // Used to avoid infinite loops.
}