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Merge pull request #119 from vector-im/bwindels/dontcreatefragmentswhennotneeded

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Only create fragments when we will really write events to the timeline store
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Bruno Windels 2020-10-01 15:04:53 +00:00 committed by GitHub
commit 5ad600cd56
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2 changed files with 37 additions and 24 deletions
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src/matrix/room/timeline/persistence/SyncWriter.js
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@ -45,11 +45,11 @@ export class SyncWriter {
const liveFragment = await txn.timelineFragments.liveFragment(this._roomId);
if (liveFragment) {
const [lastEvent] = await txn.timelineEvents.lastEvents(this._roomId, liveFragment.id, 1);
// sorting and identifying (e.g. sort key and pk to insert) are a bit intertwined here
// we could split it up into a SortKey (only with compare) and
// a EventKey (no compare or fragment index) with nextkey methods and getters/setters for eventIndex/fragmentId
// we probably need to convert from one to the other though, so bother?
this._lastLiveKey = new EventKey(liveFragment.id, lastEvent.eventIndex);
// fall back to the default event index in case the fragment was somehow written but no events
// we should only create fragments when really writing timeline events now
// (see https://github.com/vector-im/hydrogen-web/issues/112) but can't hurt to be extra robust.
const eventIndex = lastEvent ? lastEvent.eventIndex : EventKey.defaultLiveKey.eventIndex;
this._lastLiveKey = new EventKey(liveFragment.id, eventIndex);
}
// if there is no live fragment, we don't create it here because load gets a readonly txn.
// this is on purpose, load shouldn't modify the store
@ -98,6 +98,34 @@ export class SyncWriter {
return {oldFragment, newFragment};
}
/**
* creates a new live fragment if the timeline is limited, or if no live fragment is created yet
* @param {EventKey} currentKey current key so far, might be none if room hasn't synced yet
* @param {Array<BaseEntrie>} entries array to add fragment boundary entries when creating a new fragment
* @param {Object} timeline timeline part of the room sync response
* @param {Transaction} txn used to read and write from the fragment store
* @return {EventKey} the new event key to start writing events at
*/
async _ensureLiveFragment(currentKey, entries, timeline, txn) {
if (!currentKey) {
// means we haven't synced this room yet (just joined or did initial sync)
// as this is probably a limited sync, prev_batch should be there
// (but don't fail if it isn't, we won't be able to back-paginate though)
let liveFragment = await this._createLiveFragment(txn, timeline.prev_batch);
currentKey = new EventKey(liveFragment.id, EventKey.defaultLiveKey.eventIndex);
entries.push(FragmentBoundaryEntry.start(liveFragment, this._fragmentIdComparer));
} else if (timeline.limited) {
// replace live fragment for limited sync, *only* if we had a live fragment already
const oldFragmentId = currentKey.fragmentId;
currentKey = currentKey.nextFragmentKey();
const {oldFragment, newFragment} = await this._replaceLiveFragment(oldFragmentId, currentKey.fragmentId, timeline.prev_batch, txn);
entries.push(FragmentBoundaryEntry.end(oldFragment, this._fragmentIdComparer));
entries.push(FragmentBoundaryEntry.start(newFragment, this._fragmentIdComparer));
}
return currentKey;
}
_writeMember(event, txn) {
const userId = event.state_key;
if (userId) {
@ -134,7 +162,9 @@ export class SyncWriter {
}
async _writeTimeline(entries, timeline, currentKey, memberChanges, txn) {
if (Array.isArray(timeline.events)) {
if (Array.isArray(timeline.events) && timeline.events.length) {
// only create a fragment when we will really write an event
currentKey = await this._ensureLiveFragment(currentKey, entries, timeline, txn);
const events = deduplicateEvents(timeline.events);
for(const event of events) {
// store event in timeline
@ -191,28 +221,11 @@ export class SyncWriter {
async writeSync(roomResponse, txn) {
const entries = [];
const {timeline} = roomResponse;
let currentKey = this._lastLiveKey;
if (!currentKey) {
// means we haven't synced this room yet (just joined or did initial sync)
// as this is probably a limited sync, prev_batch should be there
// (but don't fail if it isn't, we won't be able to back-paginate though)
let liveFragment = await this._createLiveFragment(txn, timeline.prev_batch);
currentKey = new EventKey(liveFragment.id, EventKey.defaultLiveKey.eventIndex);
entries.push(FragmentBoundaryEntry.start(liveFragment, this._fragmentIdComparer));
} else if (timeline.limited) {
// replace live fragment for limited sync, *only* if we had a live fragment already
const oldFragmentId = currentKey.fragmentId;
currentKey = currentKey.nextFragmentKey();
const {oldFragment, newFragment} = await this._replaceLiveFragment(oldFragmentId, currentKey.fragmentId, timeline.prev_batch, txn);
entries.push(FragmentBoundaryEntry.end(oldFragment, this._fragmentIdComparer));
entries.push(FragmentBoundaryEntry.start(newFragment, this._fragmentIdComparer));
}
const memberChanges = new Map();
// important this happens before _writeTimeline so
// members are available in the transaction
this._writeStateEvents(roomResponse, memberChanges, txn);
currentKey = await this._writeTimeline(entries, timeline, currentKey, memberChanges, txn);
const currentKey = await this._writeTimeline(entries, timeline, this._lastLiveKey, memberChanges, txn);
return {entries, newLiveKey: currentKey, memberChanges};
}