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handle overlap with existing timeline when rejoining room

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This commit is contained in:
Bruno Windels 2021-04-22 17:21:29 +02:00
parent ff4abbc5ba
commit ec0de15da6
2 changed files with 31 additions and 3 deletions
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3
src/matrix/room/Room.js
View file

@ -248,8 +248,9 @@ export class Room extends EventEmitter {
/** @package */
async writeSync(roomResponse, isInitialSync, {summaryChanges, decryptChanges, roomEncryption, retryEntries}, txn, log) {
log.set("id", this.id);
const isRejoin = summaryChanges.membership === "join" && this._summary.data.membership === "leave";
const {entries: newEntries, newLiveKey, memberChanges} =
await log.wrap("syncWriter", log => this._syncWriter.writeSync(roomResponse, txn, log), log.level.Detail);
await log.wrap("syncWriter", log => this._syncWriter.writeSync(roomResponse, isRejoin, txn, log), log.level.Detail);
let allEntries = newEntries;
if (decryptChanges) {
const decryption = await log.wrap("decryptChanges", log => decryptChanges.write(txn, log));

31
src/matrix/room/timeline/persistence/SyncWriter.js
View file

@ -190,6 +190,26 @@ export class SyncWriter {
return currentKey;
}
async _handleRejoinOverlap(timeline, txn, log) {
if (this._lastLiveKey) {
const {fragmentId} = this._lastLiveKey;
const [lastEvent] = await txn.timelineEvents.lastEvents(this._roomId, fragmentId, 1);
if (lastEvent) {
const lastEventId = lastEvent.event.event_id;
const {events} = timeline;
const index = events.findIndex(event => event.event_id === lastEventId);
if (index !== -1) {
log.set("overlap_event_id", lastEventId);
return {
limited: false,
events: events.slice(index + 1)
};
}
}
}
return timeline;
}
/**
* @type {SyncWriterResult}
* @property {Array<BaseEntry>} entries new timeline entries written
@ -197,12 +217,19 @@ export class SyncWriter {
* @property {Map<string, MemberChange>} memberChanges member changes in the processed sync ny user id
*
* @param {Object} roomResponse [description]
* @param {boolean} isRejoin whether the room was rejoined in the sync being processed
* @param {Transaction} txn
* @return {SyncWriterResult}
*/
async writeSync(roomResponse, txn, log) {
async writeSync(roomResponse, isRejoin, txn, log) {
const entries = [];
const {timeline} = roomResponse;
let {timeline} = roomResponse;
// we have rejoined the room after having synced it before,
// check for overlap with the last synced event
log.set("isRejoin", isRejoin);
if (isRejoin) {
timeline = await this._handleRejoinOverlap(timeline, txn, log);
}
const memberChanges = new Map();
// important this happens before _writeTimeline so
// members are available in the transaction