import Platform from "../../../../Platform.js"; function encodeKey(roomId, fragmentId) { let fragmentIdHex = fragmentId.toString(16); fragmentIdHex = "0".repeat(8 - fragmentIdHex.length) + fragmentIdHex; return `${roomId}|${fragmentIdHex}`; } export default class RoomFragmentStore { constructor(store) { this._store = store; } _allRange(roomId) { return IDBKeyRange.bound( encodeKey(roomId, Platform.minStorageKey), encodeKey(roomId, Platform.maxStorageKey) ); } all(roomId) { return this._store.selectAll(this._allRange(roomId)); } /** Returns the fragment without a nextToken and without nextId, if any, with the largest id if there are multiple (which should not happen) */ liveFragment(roomId) { // why do we need this? // Ok, take the case where you've got a /context fragment and a /sync fragment // They are not connected. So, upon loading the persister, which one do we take? We can't sort them ... // we assume that the one without a nextToken and without a nextId is a live one // there should really be only one like this // reverse because assuming live fragment has bigger id than non-live ones return this._store.findReverse(this._allRange(roomId), fragment => { return typeof fragment.nextId !== "number" && typeof fragment.nextToken !== "string"; }); } // should generate an id an return it? // depends if we want to do anything smart with fragment ids, // like give them meaning depending on range. not for now probably ... add(fragment) { fragment.key = encodeKey(fragment.roomId, fragment.id); return this._store.add(fragment); } update(fragment) { return this._store.put(fragment); } get(roomId, fragmentId) { return this._store.get(encodeKey(roomId, fragmentId)); } }