98 lines
2.6 KiB
TypeScript
98 lines
2.6 KiB
TypeScript
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/* IMPORT */
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import * as path from 'path';
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import {LIMIT_BASENAME_LENGTH} from '../consts';
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import {Disposer} from '../types';
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import FS from './fs';
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/* TEMP */
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//TODO: Maybe publish this as a standalone package
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const Temp = {
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store: <Record<string, boolean>> {}, // filePath => purge
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create: ( filePath: string ): string => {
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const randomness = `000000${Math.floor ( Math.random () * 16777215 ).toString ( 16 )}`.slice ( -6 ), // 6 random-enough hex characters
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timestamp = Date.now ().toString ().slice ( -10 ), // 10 precise timestamp digits
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prefix = 'tmp-',
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suffix = `.${prefix}${timestamp}${randomness}`,
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tempPath = `${filePath}${suffix}`;
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return tempPath;
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},
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get: ( filePath: string, creator: ( filePath: string ) => string, purge: boolean = true ): [string, Disposer] => {
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const tempPath = Temp.truncate ( creator ( filePath ) );
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if ( tempPath in Temp.store ) return Temp.get ( filePath, creator, purge ); // Collision found, try again
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Temp.store[tempPath] = purge;
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const disposer = () => delete Temp.store[tempPath];
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return [tempPath, disposer];
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},
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purge: ( filePath: string ): void => {
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if ( !Temp.store[filePath] ) return;
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delete Temp.store[filePath];
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FS.unlinkAttempt ( filePath );
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},
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purgeSync: ( filePath: string ): void => {
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if ( !Temp.store[filePath] ) return;
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delete Temp.store[filePath];
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FS.unlinkSyncAttempt ( filePath );
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},
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purgeSyncAll: (): void => {
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for ( const filePath in Temp.store ) {
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Temp.purgeSync ( filePath );
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}
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},
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truncate: ( filePath: string ): string => { // Truncating paths to avoid getting an "ENAMETOOLONG" error //FIXME: This doesn't really always work, the actual filesystem limits must be detected for this to be implemented correctly
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const basename = path.basename ( filePath );
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if ( basename.length <= LIMIT_BASENAME_LENGTH ) return filePath; //FIXME: Rough and quick attempt at detecting ok lengths
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const truncable = /^(\.?)(.*?)((?:\.[^.]+)?(?:\.tmp-\d{10}[a-f0-9]{6})?)$/.exec ( basename );
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if ( !truncable ) return filePath; //FIXME: No truncable part detected, can't really do much without also changing the parent path, which is unsafe, hoping for the best here
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const truncationLength = basename.length - LIMIT_BASENAME_LENGTH;
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return `${filePath.slice ( 0, - basename.length )}${truncable[1]}${truncable[2].slice ( 0, - truncationLength )}${truncable[3]}`; //FIXME: The truncable part might be shorter than needed here
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}
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};
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/* INIT */
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process.on ( 'exit', Temp.purgeSyncAll ); // Ensuring purgeable temp files are purged on exit
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/* EXPORT */
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export default Temp;
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