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dont modify fragments in comparer until txn succeeds

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This commit is contained in:
Bruno Windels 2020-03-30 20:46:52 +02:00
parent 73ea09f668
commit 234c260339
3 changed files with 17 additions and 9 deletions
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1
doc/impl-thoughts/RECONNECTING.md Normal file
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@ -0,0 +1 @@
# Reconnecting

11
src/matrix/room/room.js
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@ -75,7 +75,7 @@ export default class Room extends EventEmitter {
this._storage.storeNames.timelineFragments, this._storage.storeNames.timelineFragments,
]); ]);
let removedPendingEvents; let removedPendingEvents;
let newEntries; let gapResult;
try { try {
// detect remote echos of pending messages in the gap // detect remote echos of pending messages in the gap
removedPendingEvents = this._sendQueue.removeRemoteEchos(response.chunk, txn); removedPendingEvents = this._sendQueue.removeRemoteEchos(response.chunk, txn);
@ -85,18 +85,21 @@ export default class Room extends EventEmitter {
storage: this._storage, storage: this._storage,
fragmentIdComparer: this._fragmentIdComparer fragmentIdComparer: this._fragmentIdComparer
}); });
newEntries = await gapWriter.writeFragmentFill(fragmentEntry, response, txn); gapResult = await gapWriter.writeFragmentFill(fragmentEntry, response, txn);
} catch (err) { } catch (err) {
txn.abort(); txn.abort();
throw err; throw err;
} }
await txn.complete(); await txn.complete();
// once txn is committed, emit events // once txn is committed, update in-memory state & emit events
for (const fragment of gapResult.fragments) {
this._fragmentIdComparer.add(fragment);
}
if (removedPendingEvents) { if (removedPendingEvents) {
this._sendQueue.emitRemovals(removedPendingEvents); this._sendQueue.emitRemovals(removedPendingEvents);
} }
if (this._timeline) { if (this._timeline) {
this._timeline.addGapEntries(newEntries); this._timeline.addGapEntries(gapResult.entries);
} }
} }

14
src/matrix/room/timeline/persistence/GapWriter.js
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@ -99,6 +99,7 @@ export default class GapWriter {
async _updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn) { async _updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn) {
const {direction} = fragmentEntry; const {direction} = fragmentEntry;
const changedFragments = [];
directionalAppend(entries, fragmentEntry, direction); 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 // set `end` as token, and if we found an event in the step before, link up the fragments in the fragment entry
if (neighbourFragmentEntry) { if (neighbourFragmentEntry) {
@ -126,13 +127,16 @@ export default class GapWriter {
txn.timelineFragments.update(neighbourFragmentEntry.fragment); txn.timelineFragments.update(neighbourFragmentEntry.fragment);
directionalAppend(entries, neighbourFragmentEntry, direction); directionalAppend(entries, neighbourFragmentEntry, direction);
// update fragmentIdComparer here after linking up fragments // fragments that need to be changed in the fragmentIdComparer here
this._fragmentIdComparer.add(fragmentEntry.fragment); // after txn succeeds
this._fragmentIdComparer.add(neighbourFragmentEntry.fragment); changedFragments.push(fragmentEntry.fragment);
changedFragments.push(neighbourFragmentEntry.fragment);
} else { } else {
fragmentEntry.token = end; fragmentEntry.token = end;
} }
txn.timelineFragments.update(fragmentEntry.fragment); txn.timelineFragments.update(fragmentEntry.fragment);
return changedFragments;
} }
async writeFragmentFill(fragmentEntry, response, txn) { async writeFragmentFill(fragmentEntry, response, txn) {
@ -168,9 +172,9 @@ export default class GapWriter {
// create entries for all events in chunk, add them to entries // create entries for all events in chunk, add them to entries
entries = this._storeEvents(nonOverlappingEvents, lastKey, direction, txn); entries = this._storeEvents(nonOverlappingEvents, lastKey, direction, txn);
await this._updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn); const fragments = await this._updateFragments(fragmentEntry, neighbourFragmentEntry, end, entries, txn);
return entries; return {entries, fragments};
} }
} }