server/server -> server/core

server/core/lib/files-cache/shared/abstract-simple-file-cache.ts

@@ -0,0 +1,30 @@
+import { remove } from 'fs-extra/esm'
+import { logger } from '../../../helpers/logger.js'
+import memoizee from 'memoizee'
+
+type GetFilePathResult = { isOwned: boolean, path: string, downloadName?: string } | undefined
+
+export abstract class AbstractSimpleFileCache <T> {
+
+  getFilePath: (params: T) => Promise<GetFilePathResult>
+
+  abstract getFilePathImpl (params: T): Promise<GetFilePathResult>
+
+  // Load and save the remote file, then return the local path from filesystem
+  protected abstract loadRemoteFile (key: string): Promise<GetFilePathResult>
+
+  init (max: number, maxAge: number) {
+    this.getFilePath = memoizee(this.getFilePathImpl, {
+      maxAge,
+      max,
+      promise: true,
+      dispose: (result?: GetFilePathResult) => {
+        if (result && result.isOwned !== true) {
+          remove(result.path)
+            .then(() => logger.debug('%s removed from %s', result.path, this.constructor.name))
+            .catch(err => logger.error('Cannot remove %s from cache %s.', result.path, this.constructor.name, { err }))
+        }
+      }
+    })
+  }
+}