hydrogen-web/src/mocks/Storage.ts

/*
Copyright 2021 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import {FDBFactory, FDBKeyRange} from "../../lib/fake-indexeddb/index.js";
import {StorageFactory} from "../matrix/storage/idb/StorageFactory";
import {IDOMStorage} from "../matrix/storage/idb/types";
import {Storage} from "../matrix/storage/idb/Storage";
import {Instance as nullLogger} from "../logging/NullLogger.js";
import {openDatabase, CreateObjectStore} from "../matrix/storage/idb/utils";

export function createMockStorage(): Promise<Storage> {
    return new StorageFactory(null as any, new FDBFactory(), FDBKeyRange, new MockLocalStorage()).create("1", nullLogger.item);
}

export function createMockDatabase(name: string, createObjectStore: CreateObjectStore, impl: MockIDBImpl): Promise<IDBDatabase> {
    return openDatabase(name, createObjectStore, 1, impl.idbFactory);
}

export class MockIDBImpl {
    idbFactory: FDBFactory;

    constructor() {
        this.idbFactory = new FDBFactory();
    }

    get IDBKeyRange(): typeof IDBKeyRange {
        return FDBKeyRange;
    }
}

class MockLocalStorage implements IDOMStorage {
    private _map: Map<string, string>;

    constructor() {
        this._map = new Map();
    }

    getItem(key: string): string | null {
        return this._map.get(key) || null;
    }

    setItem(key: string, value: string) {
        this._map.set(key, value);
    }

    removeItem(key: string): void {
        this._map.delete(key);
    }

    get length(): number {
        return this._map.size;
    }

    key(n: number): string | null {
        const it = this._map.keys();
        let i = -1;
        let result;
        while (i < n) {
            result = it.next();
            if (result.done) {
                return null;
            }
            i += 1;
        }
        return result?.value || null;
    }
}