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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,
]);
let removedPendingEvents;
let newEntries;
let gapResult;
try {
// detect remote echos of pending messages in the gap
removedPendingEvents = this._sendQueue.removeRemoteEchos(response.chunk, txn);
@ -85,18 +85,21 @@ export default class Room extends EventEmitter {
storage: this._storage,
fragmentIdComparer: this._fragmentIdComparer
});
newEntries = await gapWriter.writeFragmentFill(fragmentEntry, response, txn);
gapResult = await gapWriter.writeFragmentFill(fragmentEntry, response, txn);
} catch (err) {
txn.abort();
throw err;
}
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) {
this._sendQueue.emitRemovals(removedPendingEvents);
}
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) {
const {direction} = fragmentEntry;
const changedFragments = [];
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) {
@ -126,13 +127,16 @@ export default class GapWriter {
txn.timelineFragments.update(neighbourFragmentEntry.fragment);
directionalAppend(entries, neighbourFragmentEntry, direction);
// update fragmentIdComparer here after linking up fragments
this._fragmentIdComparer.add(fragmentEntry.fragment);
this._fragmentIdComparer.add(neighbourFragmentEntry.fragment);
// fragments that need to be changed in the fragmentIdComparer here
// after txn succeeds
changedFragments.push(fragmentEntry.fragment);
changedFragments.push(neighbourFragmentEntry.fragment);
} else {
fragmentEntry.token = end;
}
txn.timelineFragments.update(fragmentEntry.fragment);
return changedFragments;
}
async writeFragmentFill(fragmentEntry, response, txn) {
@ -168,9 +172,9 @@ export default class GapWriter {
// create entries for all events in chunk, add them to entries
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};
}
}