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perf: Cache deciphered n-params by info response (#505)

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absidue
2023-09-17 23:52:32 +02:00
committed by GitHub
parent 68df321858
commit d2959b3a55
3 changed files with 43 additions and 20 deletions
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26
src/parser/parser.ts
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@@ -367,15 +367,21 @@ export function parseResponse<T extends IParsedResponse = IParsedResponse>(data:
parsed_data.playability_status = playability_status;
}
const streaming_data = data.streamingData ? {
expires: new Date(Date.now() + parseInt(data.streamingData.expiresInSeconds) * 1000),
formats: parseFormats(data.streamingData.formats),
adaptive_formats: parseFormats(data.streamingData.adaptiveFormats),
dash_manifest_url: data.streamingData.dashManifestUrl || null,
hls_manifest_url: data.streamingData.hlsManifestUrl || null
} : undefined;
if (data.streamingData) {
// Currently each response with streaming data only has two n param values
// One for the adaptive formats and another for the combined formats
// As they are the same for a response, we only need to decipher them once
// For all futher deciphering calls on formats from that response, we can use the cached output, given the same input n param
const this_response_nsig_cache = new Map<string, string>();
const streaming_data = {
expires: new Date(Date.now() + parseInt(data.streamingData.expiresInSeconds) * 1000),
formats: parseFormats(data.streamingData.formats, this_response_nsig_cache),
adaptive_formats: parseFormats(data.streamingData.adaptiveFormats, this_response_nsig_cache),
dash_manifest_url: data.streamingData.dashManifestUrl || null,
hls_manifest_url: data.streamingData.hlsManifestUrl || null
};
if (streaming_data) {
parsed_data.streaming_data = streaming_data;
}
@@ -598,8 +604,8 @@ export function parseActions(data: RawData) {
return new SuperParsedResult(parseItem(data));
}
export function parseFormats(formats: RawNode[]): Format[] {
return formats?.map((format) => new Format(format)) || [];
export function parseFormats(formats: RawNode[], this_response_nsig_cache: Map<string, string>): Format[] {
return formats?.map((format) => new Format(format, this_response_nsig_cache)) || [];
}
export function applyMutations(memo: Memo, mutations: RawNode[]) {