mystiq/hydrogen-web
Archived
4
1
Fork 1
Code Issues Pull requests Packages Projects Releases Wiki Activity

draft of falling back to reading entries since last decrypted event key

Browse source 
this change notifyRoomKey(s) to only take one room key at a time
to simplify things
This commit is contained in:
Bruno Windels 2020-09-23 17:34:25 +02:00
parent a8392dc684
commit 9d41e122a0
5 changed files with 165 additions and 76 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
src/matrix/DeviceMessageHandler.js
View file

@ -59,12 +59,12 @@ export class DeviceMessageHandler {
return {roomKeys};
}
_applyDecryptChanges(rooms, {roomKeys}) {
if (roomKeys && roomKeys.length) {
const roomKeysByRoom = groupBy(roomKeys, s => s.roomId);
for (const [roomId, roomKeys] of roomKeysByRoom) {
const room = rooms.get(roomId);
room?.notifyRoomKeys(roomKeys);
async _applyDecryptChanges(rooms, {roomKeys}) {
if (Array.isArray(roomKeys)) {
for (const roomKey of roomKeys) {
const room = rooms.get(roomKey.roomId);
// TODO: this is less parallized than it could be (like sync)
await room?.notifyRoomKey(roomKey);
}
}
}
@ -101,7 +101,7 @@ export class DeviceMessageHandler {
throw err;
}
await txn.complete();
this._applyDecryptChanges(rooms, changes);
await this._applyDecryptChanges(rooms, changes);
}
async _getPendingEvents(txn) {

131
src/matrix/e2ee/RoomEncryption.js
View file

@ -42,8 +42,12 @@ export class RoomEncryption {
this._megolmBackfillCache = this._megolmDecryption.createSessionCache();
this._megolmSyncCache = this._megolmDecryption.createSessionCache();
// not `event_id`, but an internal event id passed in to the decrypt methods
this._eventIdsByMissingSession = new Map();
// session => event ids of messages we tried to decrypt and the session was missing
this._missingSessions = new SessionToEventIdsMap();
// sessions that may or may not be missing, but that while
// looking for a particular session came up as a candidate and were
// added to the cache to prevent further lookups from storage
this._missingSessionCandidates = new SessionToEventIdsMap();
this._senderDeviceCache = new Map();
this._storage = storage;
this._sessionBackup = sessionBackup;
@ -57,8 +61,7 @@ export class RoomEncryption {
return;
}
this._sessionBackup = sessionBackup;
for(const key of this._eventIdsByMissingSession.keys()) {
const {senderKey, sessionId} = decodeMissingSessionKey(key);
for(const {senderKey, sessionId} of this._missingSessions.getSessions()) {
await this._requestMissingSessionFromBackup(senderKey, sessionId, null);
}
}
@ -115,13 +118,17 @@ export class RoomEncryption {
if (customCache) {
customCache.dispose();
}
return new DecryptionPreparation(preparation, errors, {isTimelineOpen, source}, this);
return new DecryptionPreparation(preparation, errors, {isTimelineOpen, source}, this, events);
}
async _processDecryptionResults(results, errors, flags, txn) {
for (const error of errors.values()) {
if (error.code === "MEGOLM_NO_SESSION") {
this._addMissingSessionEvent(error.event, flags.source);
async _processDecryptionResults(events, results, errors, flags, txn) {
for (const event of events) {
const error = errors.get(event.event_id);
if (error?.code === "MEGOLM_NO_SESSION") {
this._addMissingSessionEvent(event, flags.source);
} else {
this._missingSessions.removeEvent(event);
this._missingSessionCandidates.removeEvent(event);
}
}
if (flags.isTimelineOpen) {
@ -145,17 +152,12 @@ export class RoomEncryption {
}
_addMissingSessionEvent(event, source) {
const senderKey = event.content?.["sender_key"];
const sessionId = event.content?.["session_id"];
const key = encodeMissingSessionKey(senderKey, sessionId);
let eventIds = this._eventIdsByMissingSession.get(key);
// new missing session
if (!eventIds) {
const isNewSession = this._missingSessions.addEvent(event);
if (isNewSession) {
const senderKey = event.content?.["sender_key"];
const sessionId = event.content?.["session_id"];
this._requestMissingSessionFromBackup(senderKey, sessionId, source);
eventIds = new Set();
this._eventIdsByMissingSession.set(key, eventIds);
}
eventIds.add(event.event_id);
}
async _requestMissingSessionFromBackup(senderKey, sessionId, source) {
@ -163,7 +165,7 @@ export class RoomEncryption {
// and only after that proceed to request from backup
if (source === DecryptionSource.Sync) {
await this._clock.createTimeout(10000).elapsed();
if (this._disposed || !this._eventIdsByMissingSession.has(encodeMissingSessionKey(senderKey, sessionId))) {
if (this._disposed || !this._missingSessions.hasSession(senderKey, sessionId)) {
return;
}
}
@ -192,8 +194,8 @@ export class RoomEncryption {
await txn.complete();
if (roomKey) {
// this will call into applyRoomKeys below
await this._room.notifyRoomKeys([roomKey]);
// this will reattempt decryption
await this._room.notifyRoomKey(roomKey);
}
} else if (session?.algorithm) {
console.info(`Backed-up session of unknown algorithm: ${session.algorithm}`);
@ -212,18 +214,17 @@ export class RoomEncryption {
* @param {Array<RoomKeyDescription>} roomKeys
* @return {Array<string>} the event ids that should be retried to decrypt
*/
applyRoomKeys(roomKeys) {
// retry decryption with the new sessions
const retryEventIds = [];
for (const roomKey of roomKeys) {
const key = encodeMissingSessionKey(roomKey.senderKey, roomKey.sessionId);
const entriesForSession = this._eventIdsByMissingSession.get(key);
if (entriesForSession) {
this._eventIdsByMissingSession.delete(key);
retryEventIds.push(...entriesForSession);
}
getEventIdsForRoomKey(roomKey) {
let eventIds = this._missingSessions.getEventIds(roomKey.senderKey, roomKey.sessionId);
if (!eventIds) {
eventIds = this._missingSessionCandidates.getEventIds(roomKey.senderKey, roomKey.sessionId);
}
return retryEventIds;
return eventIds;
}
findAndCacheEntriesForRoomKey(roomKey, candidateEntries) {
// add all to _missingSessionCandidates
// filter messages to roomKey
}
async encrypt(type, content, hsApi) {
@ -354,11 +355,12 @@ export class RoomEncryption {
* the decryption results before turning them
*/
class DecryptionPreparation {
constructor(megolmDecryptionPreparation, extraErrors, flags, roomEncryption) {
constructor(megolmDecryptionPreparation, extraErrors, flags, roomEncryption, events) {
this._megolmDecryptionPreparation = megolmDecryptionPreparation;
this._extraErrors = extraErrors;
this._flags = flags;
this._roomEncryption = roomEncryption;
this._events = events;
}
async decrypt() {
@ -366,7 +368,8 @@ class DecryptionPreparation {
await this._megolmDecryptionPreparation.decrypt(),
this._extraErrors,
this._flags,
this._roomEncryption);
this._roomEncryption,
this._events);
}
dispose() {
@ -375,17 +378,18 @@ class DecryptionPreparation {
}
class DecryptionChanges {
constructor(megolmDecryptionChanges, extraErrors, flags, roomEncryption) {
constructor(megolmDecryptionChanges, extraErrors, flags, roomEncryption, events) {
this._megolmDecryptionChanges = megolmDecryptionChanges;
this._extraErrors = extraErrors;
this._flags = flags;
this._roomEncryption = roomEncryption;
this._events = events;
}
async write(txn) {
const {results, errors} = await this._megolmDecryptionChanges.write(txn);
mergeMap(this._extraErrors, errors);
await this._roomEncryption._processDecryptionResults(results, errors, this._flags, txn);
await this._roomEncryption._processDecryptionResults(this._events, results, errors, this._flags, txn);
return new BatchDecryptionResult(results, errors);
}
}
@ -410,3 +414,58 @@ class BatchDecryptionResult {
}
}
}
class SessionToEventIdsMap {
constructor() {
this._eventIdsBySession = new Map();
}
addEvent(event) {
let isNewSession = false;
const senderKey = event.content?.["sender_key"];
const sessionId = event.content?.["session_id"];
const key = encodeMissingSessionKey(senderKey, sessionId);
let eventIds = this._eventIdsBySession.get(key);
// new missing session
if (!eventIds) {
eventIds = new Set();
this._eventIdsBySession.set(key, eventIds);
isNewSession = true;
}
eventIds.add(event.event_id);
return isNewSession;
}
getEventIds(senderKey, sessionId) {
const key = encodeMissingSessionKey(senderKey, sessionId);
const entriesForSession = this._eventIdsBySession.get(key);
if (entriesForSession) {
return [...entriesForSession];
}
}
getSessions() {
return Array.from(this._eventIdsBySession.keys()).map(decodeMissingSessionKey);
}
hasSession(senderKey, sessionId) {
return this._eventIdsBySession.has(encodeMissingSessionKey(senderKey, sessionId));
}
removeEvent(event) {
let hasRemovedSession = false;
const senderKey = event.content?.["sender_key"];
const sessionId = event.content?.["session_id"];
const key = encodeMissingSessionKey(senderKey, sessionId);
let eventIds = this._eventIdsBySession.get(key);
if (eventIds) {
if (eventIds.delete(event.event_id)) {
if (!eventIds.length) {
this._eventIdsBySession.delete(key);
hasRemovedSession = true;
}
}
}
return hasRemovedSession;
}
}

87
src/matrix/room/Room.js
View file

@ -52,42 +52,63 @@ export class Room extends EventEmitter {
this._clock = clock;
}
_readEntriesToRetryDecryption(retryEventIds) {
const readFromEventKey = retryEventIds.length !== 0;
const stores =
const txn = await this._storage.readTxn([
this._storage.storeNames.timelineEvents,
this._storage.storeNames.inboundGroupSessions,
]);
_readRetryDecryptCandidateEntries(sinceEventKey, txn) {
if (sinceEventKey) {
return readFromWithTxn(sinceEventKey, Direction.Forward, Number.MAX_SAFE_INTEGER, txn);
} else {
// all messages for room
return readFromWithTxn(this._syncWriter.lastMessageKey, Direction.Backward, Number.MAX_SAFE_INTEGER, txn);
}
}
async notifyRoomKeys(roomKeys) {
if (this._roomEncryption) {
let retryEventIds = this._roomEncryption.applyRoomKeys(roomKeys);
if (retryEventIds.length) {
const retryEntries = [];
const txn = await this._storage.readTxn([
this._storage.storeNames.timelineEvents,
this._storage.storeNames.inboundGroupSessions,
]);
for (const eventId of retryEventIds) {
const storageEntry = await txn.timelineEvents.getByEventId(this._roomId, eventId);
if (storageEntry) {
retryEntries.push(new EventEntry(storageEntry, this._fragmentIdComparer));
}
async notifyRoomKey(roomKey) {
if (!this._roomEncryption) {
return;
}
const retryEventIds = this._roomEncryption.getEventIdsForRoomKey(roomKey);
const stores = [
this._storage.storeNames.timelineEvents,
this._storage.storeNames.inboundGroupSessions,
];
let txn;
let retryEntries;
if (retryEventIds) {
retryEntries = [];
txn = await this._storage.readTxn(stores);
for (const eventId of retryEventIds) {
const storageEntry = await txn.timelineEvents.getByEventId(this._roomId, eventId);
if (storageEntry) {
retryEntries.push(new EventEntry(storageEntry, this._fragmentIdComparer));
}
const decryptRequest = this._decryptEntries(DecryptionSource.Retry, retryEntries, txn);
await decryptRequest.complete();
}
} else {
// we only look for messages since lastDecryptedEventKey because
// the timeline must be closed (otherwise getEventIdsForRoomKey would have found the event ids)
// and to update the summary we only care about events since lastDecryptedEventKey
const key = this._summary.data.lastDecryptedEventKey;
// key might be missing if we haven't decrypted any events in this room
const sinceEventKey = key && new EventKey(key.fragmentId, key.entryIndex);
// check we have not already decrypted the most recent event in the room
// otherwise we know that the messages for this room key will not update the room summary
if (!sinceEventKey || !sinceEventKey.equals(this._syncWriter.lastMessageKey)) {
txn = await this._storage.readTxn(stores.concat(this._storage.storeNames.timelineFragments));
const candidateEntries = await this._readRetryDecryptCandidateEntries(sinceEventKey, txn);
retryEntries = this._roomEncryption.findAndCacheEntriesForRoomKey(roomKey, candidateEntries);
}
}
if (retryEntries?.length) {
const decryptRequest = this._decryptEntries(DecryptionSource.Retry, retryEntries, txn);
// this will close txn while awaiting decryption
await decryptRequest.complete();
this._timeline?.replaceEntries(retryEntries);
// we would ideally write the room summary in the same txn as the groupSessionDecryptions in the
// _decryptEntries entries and could even know which events have been decrypted for the first
// time from DecryptionChanges.write and only pass those to the summary. As timeline changes
// are not essential to the room summary, it's fine to write this in a separate txn for now.
const changes = this._summary.data.applyTimelineEntries(retryEntries, false, this._isTimelineOpen);
if (await this._summary.writeAndApplyData(changes, this._storage)) {
this._emitUpdate();
}
this._timeline?.replaceEntries(retryEntries);
// we would ideally write the room summary in the same txn as the groupSessionDecryptions in the
// _decryptEntries entries and could even know which events have been decrypted for the first
// time from DecryptionChanges.write and only pass those to the summary. As timeline changes
// are not essential to the room summary, it's fine to write this in a separate txn for now.
const changes = this._summary.data.applyTimelineEntries(retryEntries, false, this._isTimelineOpen);
if (await this._summary.writeAndApplyData(changes, this._storage)) {
this._emitUpdate();
}
}
}
@ -203,7 +224,7 @@ export class Room extends EventEmitter {
heroChanges = await this._heroes.calculateChanges(summaryChanges.heroes, memberChanges, txn);
}
let removedPendingEvents;
if (roomResponse.timeline && roomResponse.timeline.events) {
if (Array.isArray(roomResponse.timeline?.events)) {
removedPendingEvents = this._sendQueue.removeRemoteEchos(roomResponse.timeline.events, txn);
}
return {

4
src/matrix/room/timeline/EventKey.js
View file

@ -63,6 +63,10 @@ export class EventKey {
toString() {
return `[${this.fragmentId}/${this.eventIndex}]`;
}
equals(other) {
return this.fragmentId === other?.fragmentId && this.eventIndex === other?.eventIndex;
}
}
export function xtests() {

5
src/matrix/room/timeline/persistence/TimelineReader.js
View file

@ -46,6 +46,7 @@ export async function readFromWithTxn(eventKey, direction, amount, r, txn) {
while (entries.length < amount && eventKey) {
let eventsWithinFragment;
if (direction.isForward) {
// TODO: should we pass amount - entries.length here?
eventsWithinFragment = await timelineStore.eventsAfter(this._roomId, eventKey, amount);
} else {
eventsWithinFragment = await timelineStore.eventsBefore(this._roomId, eventKey, amount);
@ -56,6 +57,10 @@ export async function readFromWithTxn(eventKey, direction, amount, r, txn) {
if (entries.length < amount) {
const fragment = await fragmentStore.get(this._roomId, eventKey.fragmentId);
// TODO: why does the first fragment not need to be added? (the next *is* added below)
// it looks like this would be fine when loading in the sync island
// (as the live fragment should be added already) but not for permalinks when we support them
//
// this._fragmentIdComparer.addFragment(fragment);
let fragmentEntry = new FragmentBoundaryEntry(fragment, direction.isBackward, this._fragmentIdComparer);
// append or prepend fragmentEntry, reuse func from GapWriter?