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split up persistFragmentFill method into smaller ones

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This commit is contained in:
Bruno Windels 2019-05-12 20:41:14 +02:00
parent 10457611f9
commit 3324fd3afd
1 changed files with 70 additions and 46 deletions
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116
src/matrix/room/timeline/persistence/GapPersister.js
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@ -16,6 +16,69 @@ export default class GapPersister {
this._storage = storage;
this._fragmentIdComparer = fragmentIdComparer;
}
async _findOverlappingEvents(fragmentEntry, events, txn) {
const eventIds = events.map(e => e.event_id);
const {direction} = fragmentEntry;
const findLast = direction.isBackward;
let nonOverlappingEvents = events;
let neighbourFragmentEntry;
const neighbourEventId = await txn.timelineEvents.findFirstOrLastOccurringEventId(this._roomId, eventIds, findLast);
if (neighbourEventId) {
// trim overlapping events
const neighbourEventIndex = events.findIndex(e => e.event_id === neighbourEventId);
const start = direction.isBackward ? neighbourEventIndex + 1 : 0;
const end = direction.isBackward ? events.length : neighbourEventIndex;
nonOverlappingEvents = events.slice(start, end);
// get neighbour fragment to link it up later on
const neighbourEvent = await txn.timelineEvents.getByEventId(this._roomId, neighbourEventId);
const neighbourFragment = await txn.timelineFragments.get(neighbourEvent.fragmentId);
neighbourFragmentEntry = fragmentEntry.createNeighbourEntry(neighbourFragment);
}
return {nonOverlappingEvents, neighbourFragmentEntry};
}
async _findLastFragmentEventKey(fragmentEntry, txn) {
const {fragmentId, direction} = fragmentEntry;
if (direction.isBackward) {
const [firstEvent] = await txn.timelineEvents.firstEvents(this._roomId, fragmentId, 1);
return new EventKey(firstEvent.fragmentId, firstEvent.eventIndex);
} else {
const [lastEvent] = await txn.timelineEvents.lastEvents(this._roomId, fragmentId, 1);
return new EventKey(lastEvent.fragmentId, lastEvent.eventIndex);
}
}
_storeEvents(events, startKey, direction, txn) {
const entries = new Array(events.length);
const reducer = direction.isBackward ? Array.prototype.reduceRight : Array.prototype.reduce;
reducer.call(events, (key, event, i) => {
key = key.nextKeyForDirection(direction);
const eventEntry = createEventEntry(key, event);
txn.timelineEvents.insert(eventEntry);
entries[i] = new EventEntry(eventEntry, this._fragmentIdComparer);
}, startKey);
return entries;
}
async _updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn) {
const {direction} = fragmentEntry;
directionalAppend(entries, fragmentEntry, direction);
// set `end` as token, and if we found an event in the step before, link up the fragments in the fragment entry
if (neighbourFragmentEntry) {
fragmentEntry.linkedFragmentId = neighbourFragmentEntry.fragmentId;
neighbourFragmentEntry.linkedFragmentId = fragmentEntry.fragmentId;
txn.timelineFragments.set(neighbourFragmentEntry.fragment);
directionalAppend(entries, neighbourFragmentEntry, direction);
// update fragmentIdComparer here after linking up fragments?
this._fragmentIdComparer.rebuild(await txn.timelineFragments.all());
}
fragmentEntry.token = end;
txn.timelineFragments.set(fragmentEntry.fragment);
}
async persistFragmentFill(fragmentEntry, response) {
const {fragmentId, direction} = fragmentEntry;
// assuming that chunk is in chronological order when backwards too?
@ -46,55 +109,16 @@ export default class GapPersister {
throw new Error("start is not equal to prev_batch or next_batch");
}
// find last event in fragment so we get the eventIndex to begin creating keys at
let currentKey;
if (direction.isBackward) {
const [firstEvent] = await txn.timelineEvents.firstEvents(this._roomId, fragmentId, 1);
currentKey = new EventKey(firstEvent.fragmentId, firstEvent.eventIndex);
} else {
const [lastEvent] = await txn.timelineEvents.lastEvents(this._roomId, fragmentId, 1);
currentKey = new EventKey(lastEvent.fragmentId, lastEvent.eventIndex);
}
let lastKey = this._findLastFragmentEventKey(fragmentEntry, txn);
// find out if any event in chunk is already present using findFirstOrLastOccurringEventId
const eventIds = chunk.map(e => e.event_id);
const findLast = direction.isBackward;
let nonOverlappingEvents = chunk;
let neighbourFragmentEntry;
const neighbourEventId = await txn.timelineEvents.findFirstOrLastOccurringEventId(this._roomId, eventIds, findLast);
if (neighbourEventId) {
// trim overlapping events
const neighbourEventIndex = chunk.findIndex(e => e.event_id === neighbourEventId);
const start = direction.isBackward ? neighbourEventIndex + 1 : 0;
const end = direction.isBackward ? chunk.length : neighbourEventIndex;
nonOverlappingEvents = chunk.slice(start, end);
// get neighbour fragment to link it up later on
const neighbourEvent = await txn.timelineEvents.getByEventId(this._roomId, neighbourEventId);
const neighbourFragment = await txn.timelineFragments.get(neighbourEvent.fragmentId);
neighbourFragmentEntry = fragmentEntry.createNeighbourEntry(neighbourFragment);
}
const {
nonOverlappingEvents,
neighbourFragmentEntry
} = this._findOverlappingEvents(fragmentEntry, chunk, txn);
// create entries for all events in chunk, add them to entries
entries = new Array(nonOverlappingEvents.length);
const reducer = direction.isBackward ? Array.prototype.reduceRight : Array.prototype.reduce;
currentKey = reducer.call(nonOverlappingEvents, (key, event, i) => {
key = key.nextKeyForDirection(direction);
const eventEntry = createEventEntry(currentKey, event);
txn.timelineEvents.insert(eventEntry);
entries[i] = new EventEntry(eventEntry, this._fragmentIdComparer);
}, currentKey);
directionalAppend(entries, fragmentEntry, direction);
// set `end` as token, and if we found an event in the step before, link up the fragments in the fragment entry
if (neighbourFragmentEntry) {
fragmentEntry.linkedFragmentId = neighbourFragmentEntry.fragmentId;
neighbourFragmentEntry.linkedFragmentId = fragmentEntry.fragmentId;
txn.timelineFragments.set(neighbourFragmentEntry.fragment);
directionalAppend(entries, neighbourFragmentEntry, direction);
// update fragmentIdComparer here after linking up fragments?
this._fragmentIdComparer.rebuild(await txn.timelineFragments.all());
}
fragmentEntry.token = end;
txn.timelineFragments.set(fragmentEntry.fragment);
entries = this._storeEvents(nonOverlappingEvents, lastKey, direction, txn);
await this._updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn);
} catch (err) {
txn.abort();
throw err;