forked from mystiq/hydrogen-web
66 lines
2.4 KiB
JavaScript
66 lines
2.4 KiB
JavaScript
import {iterateCursor} from "./utils.js";
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import {RoomMember, EVENT_TYPE as MEMBER_EVENT_TYPE} from "../../room/RoomMember.js";
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// FUNCTIONS SHOULD ONLY BE APPENDED!!
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// the index in the array is the database version
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export const schema = [
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createInitialStores,
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createMemberStore,
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];
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// TODO: how to deal with git merge conflicts of this array?
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// how do we deal with schema updates vs existing data migration in a way that
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//v1
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function createInitialStores(db) {
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db.createObjectStore("session", {keyPath: "key"});
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// any way to make keys unique here? (just use put?)
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db.createObjectStore("roomSummary", {keyPath: "roomId"});
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// need index to find live fragment? prooobably ok without for now
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//key = room_id | fragment_id
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db.createObjectStore("timelineFragments", {keyPath: "key"});
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//key = room_id | fragment_id | event_index
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const timelineEvents = db.createObjectStore("timelineEvents", {keyPath: "key"});
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//eventIdKey = room_id | event_id
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timelineEvents.createIndex("byEventId", "eventIdKey", {unique: true});
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//key = room_id | event.type | event.state_key,
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db.createObjectStore("roomState", {keyPath: "key"});
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db.createObjectStore("pendingEvents", {keyPath: "key"});
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}
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//v2
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async function createMemberStore(db, txn) {
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const roomMembers = db.createObjectStore("roomMembers", {keyPath: [
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"roomId",
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"userId"
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]});
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// migrate existing member state events over
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const roomState = txn.objectStore("roomState");
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await iterateCursor(roomState.openCursor(), entry => {
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if (entry.event.type === MEMBER_EVENT_TYPE) {
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roomState.delete(entry.key);
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const member = RoomMember.fromMemberEvent(entry.roomId, entry.event);
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if (member) {
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roomMembers.add(member.serialize());
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}
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}
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});
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}
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function migrateKeyPathToArray(db, isNew) {
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if (isNew) {
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// create the new stores with the final name
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} else {
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// create the new stores with a tmp name
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// migrate the data over
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// change the name
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}
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// maybe it is ok to just run all the migration steps?
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// it might be a bit slower to create a store twice ...
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// but at least the path of migration or creating a new store
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// will go through the same code
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//
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// might not even be slower, as this is all happening within one transaction
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}
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