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don't (re)link fragments in fill, close gap if overlap w linked fragment

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This commit is contained in:
Bruno Windels 2021-09-23 18:02:05 +02:00
parent 45917eae1d
commit e6f7f213ec
3 changed files with 32 additions and 94 deletions
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76
src/matrix/room/timeline/persistence/GapWriter.js
View file

@ -28,61 +28,21 @@ export class GapWriter {
}
// events is in reverse-chronological order (last event comes at index 0) if backwards
async _findOverlappingEvents(fragmentEntry, events, txn, log) {
let expectedOverlappingEventId;
if (fragmentEntry.hasLinkedFragment) {
expectedOverlappingEventId = await this._findExpectedOverlappingEventId(fragmentEntry, txn);
}
let remainingEvents = events;
let nonOverlappingEvents = [];
const existingEventKeyMap = await txn.timelineEvents.getEventKeysForIds(this._roomId, eventIds);
const nonOverlappingEvents = events.filter(e => !existingEventKeyMap.has(e.event_id));
let neighbourFragmentEntry;
while (remainingEvents && remainingEvents.length) {
const eventIds = remainingEvents.map(e => e.event_id);
const duplicateEventId = await txn.timelineEvents.findFirstOccurringEventId(this._roomId, eventIds);
if (duplicateEventId) {
const duplicateEventIndex = remainingEvents.findIndex(e => e.event_id === duplicateEventId);
// should never happen, just being defensive as this *can't* go wrong
if (duplicateEventIndex === -1) {
throw new Error(`findFirstOccurringEventId returned ${duplicateEventIndex} which wasn't ` +
`in [${eventIds.join(",")}] in ${this._roomId}`);
if (fragmentEntry.hasLinkedFragment) {
for (const eventKey of existingEventKeyMap.values()) {
if (eventKey.fragmentId === fragmentEntry.linkedFragmentId) {
const neighbourFragment = await txn.timelineFragments.get(this._roomId, fragmentEntry.linkedFragmentId);
neighbourFragmentEntry = fragmentEntry.createNeighbourEntry(neighbourFragment);
break;
}
nonOverlappingEvents.push(...remainingEvents.slice(0, duplicateEventIndex));
if (!expectedOverlappingEventId || duplicateEventId === expectedOverlappingEventId) {
// TODO: check here that the neighbourEvent is at the correct edge of it's fragment
// get neighbour fragment to link it up later on
const neighbourEvent = await txn.timelineEvents.getByEventId(this._roomId, duplicateEventId);
if (neighbourEvent.fragmentId === fragmentEntry.fragmentId) {
log.log("hit #160, prevent fragment linking to itself", log.level.Warn);
} else {
const neighbourFragment = await txn.timelineFragments.get(this._roomId, neighbourEvent.fragmentId);
neighbourFragmentEntry = fragmentEntry.createNeighbourEntry(neighbourFragment);
}
// trim overlapping events
remainingEvents = null;
} else {
// we've hit https://github.com/matrix-org/synapse/issues/7164,
// e.g. the event id we found is already in our store but it is not
// the adjacent fragment id. Ignore the event, but keep processing the ones after.
remainingEvents = remainingEvents.slice(duplicateEventIndex + 1);
}
} else {
nonOverlappingEvents.push(...remainingEvents);
remainingEvents = null;
}
}
return {nonOverlappingEvents, neighbourFragmentEntry};
}
async _findExpectedOverlappingEventId(fragmentEntry, txn) {
const eventEntry = await this._findFragmentEdgeEvent(
fragmentEntry.linkedFragmentId,
// reverse because it's the oppose edge of the linked fragment
fragmentEntry.direction.reverse(),
txn);
if (eventEntry) {
return eventEntry.event.event_id;
}
}
async _findFragmentEdgeEventKey(fragmentEntry, txn) {
const {fragmentId, direction} = fragmentEntry;
const event = await this._findFragmentEdgeEvent(fragmentId, direction, txn);
@ -168,22 +128,6 @@ export class GapWriter {
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) {
// the throws here should never happen and are only here to detect client or unhandled server bugs
// and a last measure to prevent corrupting fragment links
if (!fragmentEntry.hasLinkedFragment) {
fragmentEntry.linkedFragmentId = neighbourFragmentEntry.fragmentId;
} else if (fragmentEntry.linkedFragmentId !== neighbourFragmentEntry.fragmentId) {
throw new Error(`Prevented changing fragment ${fragmentEntry.fragmentId} ` +
`${fragmentEntry.direction.asApiString()} link from ${fragmentEntry.linkedFragmentId} ` +
`to ${neighbourFragmentEntry.fragmentId} in ${this._roomId}`);
}
if (!neighbourFragmentEntry.hasLinkedFragment) {
neighbourFragmentEntry.linkedFragmentId = fragmentEntry.fragmentId;
} else if (neighbourFragmentEntry.linkedFragmentId !== fragmentEntry.fragmentId) {
throw new Error(`Prevented changing fragment ${neighbourFragmentEntry.fragmentId} ` +
`${neighbourFragmentEntry.direction.asApiString()} link from ${neighbourFragmentEntry.linkedFragmentId} ` +
`to ${fragmentEntry.fragmentId} in ${this._roomId}`);
}
// if neighbourFragmentEntry was found, it means the events were overlapping,
// so no pagination should happen anymore.
neighbourFragmentEntry.token = null;
@ -242,10 +186,6 @@ export class GapWriter {
nonOverlappingEvents,
neighbourFragmentEntry
} = await this._findOverlappingEvents(fragmentEntry, chunk, txn, log);
if (!neighbourFragmentEntry && nonOverlappingEvents.length === 0 && typeof end === "string") {
log.log("hit #160, clearing token", log.level.Warn);
end = null;
}
// create entries for all events in chunk, add them to entries
const {entries, updatedEntries} = await this._storeEvents(nonOverlappingEvents, lastKey, direction, state, txn, log);
const fragments = await this._updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn);

32
src/matrix/storage/idb/QueryTarget.ts
View file

@ -164,37 +164,17 @@ export class QueryTarget<T> {
* If the callback returns true, the search is halted and callback won't be called again.
* `callback` is called with the same instances of the key as given in `keys`, so direct comparison can be used.
*/
async findExistingKeys(keys: IDBValidKey[], backwards: boolean, callback: (key: IDBValidKey, found: boolean) => boolean): Promise<void> {
async findExistingKeys(keys: IDBValidKey[], backwards: boolean, callback: (key: IDBValidKey, pk: IDBValidKey) => boolean): Promise<void> {
const direction = backwards ? "prev" : "next";
const compareKeys = (a, b) => backwards ? -this.idbFactory.cmp(a, b) : this.idbFactory.cmp(a, b);
const sortedKeys = keys.slice().sort(compareKeys);
const sortedKeys = keys.slice().sort((a, b) => backwards ? -this.idbFactory.cmp(a, b) : this.idbFactory.cmp(a, b));
const firstKey = backwards ? sortedKeys[sortedKeys.length - 1] : sortedKeys[0];
const lastKey = backwards ? sortedKeys[0] : sortedKeys[sortedKeys.length - 1];
const cursor = this._target.openKeyCursor(this.IDBKeyRange.bound(firstKey, lastKey), direction);
let i = 0;
let consumerDone = false;
await iterateCursor(cursor, (value, key) => {
// while key is larger than next key, advance and report false
while(i < sortedKeys.length && compareKeys(sortedKeys[i], key) < 0 && !consumerDone) {
consumerDone = callback(sortedKeys[i], false);
++i;
}
if (i < sortedKeys.length && compareKeys(sortedKeys[i], key) === 0 && !consumerDone) {
consumerDone = callback(sortedKeys[i], true);
++i;
}
const done = consumerDone || i >= sortedKeys.length;
let jumpTo;
if (!done) {
jumpTo = sortedKeys[i];
}
return {done, jumpTo};
await iterateCursor(cursor, (value, key, cursor) => {
const pk = cursor.primaryKey;
const done = callback(key, pk);
return done ? DONE : NOT_DONE;
});
// report null for keys we didn't to at the end
while (!consumerDone && i < sortedKeys.length) {
consumerDone = callback(sortedKeys[i], false);
++i;
}
}
_reduce<B>(range: IDBQuery, reducer: (reduced: B, value: T) => B, initialValue: B, direction: IDBCursorDirection): Promise<boolean> {

18
src/matrix/storage/idb/stores/TimelineEventStore.ts
View file

@ -44,6 +44,11 @@ function encodeKey(roomId: string, fragmentId: number, eventIndex: number): stri
return `${roomId}|${encodeUint32(fragmentId)}|${encodeUint32(eventIndex)}`;
}
function decodeKey(key: string): { roomId: string, fragmentId: number, eventIndex: number } {
const [roomId, fragmentId, eventIndex] = key.split("|");
return {roomId, fragmentId: parseInt(fragmentId, 10), eventIndex: parseInt(eventIndex, 10)};
}
function encodeEventIdKey(roomId: string, eventId: string): string {
return `${roomId}|${eventId}`;
}
@ -220,6 +225,19 @@ export class TimelineEventStore {
return events;
}
async getEventKeysForIds(roomId: string, eventIds: string[]): Promise<Map<string, EventKey>> {
const byEventId = this._timelineStore.index("byEventId");
const keys = eventIds.map(eventId => encodeEventIdKey(roomId, eventId));
const results = new Map();
await byEventId.findExistingKeys(keys, false, (indexKey, pk) => {
const {eventId} = decodeEventIdKey(indexKey as string);
const {fragmentId, eventIndex} = decodeKey(pk as string);
results.set(eventId, new EventKey(fragmentId, eventIndex));
return false;
});
return results;
}
/** Finds the first eventId that occurs in the store, if any.
* For optimal performance, `eventIds` should be in chronological order.
*