76 lines
2.6 KiB
JavaScript
76 lines
2.6 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { StorageError } from "../../common.js";
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import {Platform} from "../../../../Platform.js";
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import { encodeUint32 } from "../utils.js";
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function encodeKey(roomId, fragmentId) {
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return `${roomId}|${encodeUint32(fragmentId)}`;
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}
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export class TimelineFragmentStore {
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constructor(store) {
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this._store = store;
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}
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_allRange(roomId) {
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try {
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return IDBKeyRange.bound(
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encodeKey(roomId, Platform.minStorageKey),
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encodeKey(roomId, Platform.maxStorageKey)
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);
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} catch (err) {
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throw new StorageError(`error from IDBKeyRange with roomId ${roomId}`, err);
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}
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}
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all(roomId) {
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return this._store.selectAll(this._allRange(roomId));
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}
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/** Returns the fragment without a nextToken and without nextId,
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if any, with the largest id if there are multiple (which should not happen) */
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liveFragment(roomId) {
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// why do we need this?
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// Ok, take the case where you've got a /context fragment and a /sync fragment
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// They are not connected. So, upon loading the persister, which one do we take? We can't sort them ...
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// we assume that the one without a nextToken and without a nextId is a live one
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// there should really be only one like this
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// reverse because assuming live fragment has bigger id than non-live ones
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return this._store.findReverse(this._allRange(roomId), fragment => {
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return typeof fragment.nextId !== "number" && typeof fragment.nextToken !== "string";
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});
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}
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// should generate an id an return it?
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// depends if we want to do anything smart with fragment ids,
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// like give them meaning depending on range. not for now probably ...
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add(fragment) {
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fragment.key = encodeKey(fragment.roomId, fragment.id);
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return this._store.add(fragment);
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}
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update(fragment) {
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return this._store.put(fragment);
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}
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get(roomId, fragmentId) {
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return this._store.get(encodeKey(roomId, fragmentId));
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}
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}
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