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PadManager: Refactor `padList` to avoid duplicate loads

pull/5347/head
Richard Hansen 2022-01-02 20:40:06 -05:00
parent 66ce2b50a9
commit fd9b770579
1 changed files with 25 additions and 43 deletions
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68
src/node/db/PadManager.js
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@ -50,59 +50,41 @@ const globalPads = {
*
* Updated without db access as new pads are created/old ones removed.
*/
const padList = {
list: new Set(),
cachedList: undefined,
initiated: false,
async init() {
const dbData = await db.findKeys('pad:*', '*:*:*');
const padList = new class {
constructor() {
this._cachedList = null;
this._list = new Set();
this._loaded = null;
}
if (dbData != null) {
this.initiated = true;
for (const val of dbData) {
this.addPad(val.replace(/^pad:/, ''), false);
}
}
return this;
},
async load() {
if (!this.initiated) {
return this.init();
}
return this;
},
/**
* Returns all pads in alphabetical order as array.
*/
async getPads() {
await this.load();
if (!this.cachedList) {
this.cachedList = Array.from(this.list).sort();
if (!this._loaded) {
this._loaded = (async () => {
const dbData = await db.findKeys('pad:*', '*:*:*');
if (dbData == null) return;
for (const val of dbData) this.addPad(val.replace(/^pad:/, ''));
})();
}
await this._loaded;
if (!this._cachedList) this._cachedList = [...this._list].sort();
return this._cachedList;
}
return this.cachedList;
},
addPad(name) {
if (!this.initiated) return;
if (this._list.has(name)) return;
this._list.add(name);
this._cachedList = null;
}
if (!this.list.has(name)) {
this.list.add(name);
this.cachedList = undefined;
}
},
removePad(name) {
if (!this.initiated) return;
if (this.list.has(name)) {
this.list.delete(name);
this.cachedList = undefined;
}
},
};
if (!this._list.has(name)) return;
this._list.delete(name);
this._cachedList = null;
}
}();
// initialises the all-knowing data structure