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msagent.js: Cache parsed ACS data

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Instead of duplicating it per every instance of an Agent, since it is never mutated by an Agent, we can just cache it.
This commit is contained in:
Lily Tsuru 2024-07-12 19:13:53 -04:00
parent 1d19098ca7
commit 61dc78ba3b
1 changed files with 26 additions and 8 deletions
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28
msagent.js/src/character.ts
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@ -13,7 +13,15 @@ export class AcsData {
images: AcsImageEntry[] = []; images: AcsImageEntry[] = [];
} }
function agentCharacterParseACS(buffer: BufferStream): AcsData { // Cache of ACS data per character (for agentCreateCharacterFromUrl)
let acsDataCache = new Map<string, AcsData>();
// Purges the ACS cache.
export function agentPurgeACSCache() {
acsDataCache.clear();
}
export function agentCharacterParseACS(buffer: BufferStream): AcsData {
// Make sure the magic is correct for the ACS file. // Make sure the magic is correct for the ACS file.
if (buffer.readU32LE() != 0xabcdabc3) { if (buffer.readU32LE() != 0xabcdabc3) {
throw new Error('The provided data buffer does not contain valid ACS data.'); throw new Error('The provided data buffer does not contain valid ACS data.');
@ -47,12 +55,22 @@ function agentCharacterParseACS(buffer: BufferStream): AcsData {
return acsData; return acsData;
} }
export function agentCreateCharacter(data: Uint8Array): Agent { export function agentCreateCharacter(data: AcsData): Agent {
return new Agent(agentCharacterParseACS(new BufferStream(data))); return new Agent(data);
} }
export async function agentCreateCharacterFromUrl(url: string) { export async function agentCreateCharacterFromUrl(url: string) : Promise<Agent> {
// just return the cache object
if(acsDataCache.has(url)) {
return agentCreateCharacter(acsDataCache.get(url)!);
} else {
let res = await fetch(url); let res = await fetch(url);
let data = await res.arrayBuffer(); let data = await res.arrayBuffer();
return agentCreateCharacter(new Uint8Array(data));
let buffer = new Uint8Array(data);
let acsData = agentCharacterParseACS(new BufferStream(buffer));
acsDataCache.set(url, acsData);
return agentCreateCharacter(acsData);
}
} }