vector-im-hydrogen-web/src/matrix/storage/idb/transaction.js

import {txnAsPromise} from "./utils.js";
import {StorageError} from "../common.js";
import {Store} from "./store.js";
import {SessionStore} from "./stores/SessionStore.js";
import {RoomSummaryStore} from "./stores/RoomSummaryStore.js";
import {TimelineEventStore} from "./stores/TimelineEventStore.js";
import {RoomStateStore} from "./stores/RoomStateStore.js";
import {TimelineFragmentStore} from "./stores/TimelineFragmentStore.js";
import {PendingEventStore} from "./stores/PendingEventStore.js";

export class Transaction {
    constructor(txn, allowedStoreNames) {
        this._txn = txn;
        this._allowedStoreNames = allowedStoreNames;
        this._stores = {
            session: null,
            roomSummary: null,
            roomTimeline: null,
            roomState: null,
        };
    }

    _idbStore(name) {
        if (!this._allowedStoreNames.includes(name)) {
            // more specific error? this is a bug, so maybe not ...
            throw new StorageError(`Invalid store for transaction: ${name}, only ${this._allowedStoreNames.join(", ")} are allowed.`);
        }
        return new Store(this._txn.objectStore(name));
    }

    _store(name, mapStore) {
        if (!this._stores[name]) {
            const idbStore = this._idbStore(name);
            this._stores[name] = mapStore(idbStore);
        }
        return this._stores[name];
    }

    get session() {
        return this._store("session", idbStore => new SessionStore(idbStore));
    }

    get roomSummary() {
        return this._store("roomSummary", idbStore => new RoomSummaryStore(idbStore));
    }

    get timelineFragments() {
        return this._store("timelineFragments", idbStore => new TimelineFragmentStore(idbStore));
    }

    get timelineEvents() {
        return this._store("timelineEvents", idbStore => new TimelineEventStore(idbStore));
    }

    get roomState() {
        return this._store("roomState", idbStore => new RoomStateStore(idbStore));
    }

    get pendingEvents() {
        return this._store("pendingEvents", idbStore => new PendingEventStore(idbStore));
    }

    complete() {
        return txnAsPromise(this._txn);
    }

    abort() {
        this._txn.abort();
    }
}