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implement reading n events from end of live fragment

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This commit is contained in:
Bruno Windels 2019-06-01 17:04:05 +02:00
parent 3137f025c7
commit f8fbfbff9a
2 changed files with 33 additions and 4 deletions
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3
src/matrix/room/timeline/Timeline.js
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@ -19,8 +19,7 @@ export default class Timeline {
/** @package */
async load() {
const txn = await this._storage.readTxn([this._storage.storeNames.timelineEvents]);
const entries = await txn.roomTimeline.lastEvents(this._roomId, 100);
const entries = this._timelineReader.readFromEnd(100);
for (const entry of entries) {
this._entriesList.append(entry);
}

34
src/matrix/room/timeline/persistence/TimelineReader.js
View File

@ -1,5 +1,6 @@
import {directionalConcat, directionalAppend} from "./common.js";
import EventKey from "../EventKey.js";
import Direction from "../Direction.js";
import EventEntry from "../entries/EventEntry.js";
import FragmentBoundaryEntry from "../entries/FragmentBoundaryEntry.js";
@ -10,11 +11,19 @@ export default class TimelineReader {
this._fragmentIdComparer = fragmentIdComparer;
}
async readFrom(eventKey, direction, amount) {
const txn = this._storage.readTxn([
_openTxn() {
return this._storage.readTxn([
this._storage.storeNames.timelineEvents,
this._storage.storeNames.timelineFragments,
]);
}
async readFrom(eventKey, direction, amount) {
const txn = await this._openTxn();
return this._readFrom(eventKey, direction, amount, txn);
}
async _readFrom(eventKey, direction, amount, txn) {
let entries = [];
const timelineStore = txn.timelineEvents;
@ -52,4 +61,25 @@ export default class TimelineReader {
return entries;
}
async readFromEnd(amount) {
const txn = await this._openTxn();
const liveFragment = await txn.timelineFragments.liveFragment(this._roomId);
// room hasn't been synced yet
if (!liveFragment) {
return [];
}
this._fragmentIdComparer.add(liveFragment);
const liveFragmentEntry = new FragmentBoundaryEntry(liveFragment, Direction.Forward, this._fragmentIdComparer);
const eventKey = new EventKey(liveFragmentEntry.fragmentId, liveFragmentEntry.eventIndex);
const entries = this._readFrom(eventKey, Direction.Backward, amount, txn);
entries.unshift(liveFragmentEntry);
return entries;
}
// reads distance up and down from eventId
// or just expose eventIdToKey?
readAtEventId(eventId, distance) {
return null;
}
}