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Greatly improve id conversion performance

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Laura Hausmann 2023-09-26 18:47:33 +02:00
parent 76aa8eeefb
commit 7cb576a535
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GPG Key ID: D044E84C5BE01605
1 changed files with 4 additions and 12 deletions
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16
packages/backend/src/misc/convert-id.ts
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@ -9,27 +9,19 @@ const chars = '0123456789abcdefghijklmnopqrstuvwxyz';
//FIXME: Make this idempotent //FIXME: Make this idempotent
export function convertId(id: string, target: IdType): string { export function convertId(id: string, target: IdType): string {
if (target == IdType.IceshrimpId) { if (target == IdType.IceshrimpId) {
let input = BigInt(id); return BigInt(id).toString(36);
let result = '';
while (input !== 0n) {
result = chars.at(Number(input % 36n)) + result;
input /= 36n;
}
return result;
} }
else if (target == IdType.MastodonId) { else if (target == IdType.MastodonId) {
let result = 0n; let result = 0n;
const iter = id.toLowerCase().split('').reverse(); const iter = id.toLowerCase();
for (let i = 0; i < iter.length; i++){ for (let i = 0; i < iter.length; i++){
const char = iter[i]; const char = iter[i];
if (!chars.includes(char)) throw new Error('Invalid ID'); if (!chars.includes(char)) throw new Error('Invalid ID');
result += BigInt(chars.indexOf(char)) * BigInt(36 ** i); result = result * 36n + BigInt(chars.indexOf(char));
} }
return result.toString(); return result.toString();
} }
throw new Error('Unknown ID type'); throw new Error('Unknown ID type');
} }