vector-im-hydrogen-web/src/storage/idb/create.js

import Storage from "./storage.js";
import { openDatabase } from "./utils.js";

export default async function createIdbStorage(databaseName) {
	const db = await openDatabase(databaseName, createStores, 1);
	return new Storage(db);
}

function createStores(db) {
	db.createObjectStore("session", {keyPath: "key"});
	// any way to make keys unique here?
	db.createObjectStore("roomSummary", {keyPath: "room_id"});
	const timeline = db.createObjectStore("roomTimeline", {keyPath: ["room_id", "sort_key"]});
	timeline.createIndex("by_event_id", ["room_id", "event.event_id"], {unique: true});
	// how to get the first/last x events for a room?
	// we don't want to specify the sort key, but would need an index for the room_id?
	// take sort_key as primary key then and have index on event_id?
	// still, you also can't have a PK of [room_id, sort_key] and get the last or first events with just the room_id? the only thing that changes it that the PK will provide an inherent sorting that you inherit in an index that only has room_id as keyPath??? There must be a better way, need to write a prototype test for this.
	// SOLUTION: with numeric keys, you can just us a min/max value to get first/last
	// db.createObjectStore("members", ["room_id", "state_key"]);
	const state = db.createObjectStore("roomState", {keyPath: ["event.room_id", "event.type", "event.state_key"]});
}