Worker WIP

src/domain/ViewModel.js

@@ -36,8 +36,7 @@ export class ViewModel extends EventEmitter {
         if (!this.disposables) {
             this.disposables = new Disposables();
         }
-        this.disposables.track(disposable);
-        return disposable;
+        return this.disposables.track(disposable);
     }
 
     dispose() {

src/domain/session/room/RoomViewModel.js

@@ -38,7 +38,8 @@ export class RoomViewModel extends ViewModel {
     async load() {
         this._room.on("change", this._onRoomChange);
         try {
-            this._timeline = await this._room.openTimeline();
+            this._timeline = this._room.openTimeline();
+            await this._timeline.load();
             this._timelineVM = new TimelineViewModel(this.childOptions({
                 room: this._room,
                 timeline: this._timeline,

src/matrix/e2ee/RoomEncryption.js

@@ -268,7 +268,7 @@ class DecryptionPreparation {
     }
 
     dispose() {
-        this._megolmDecryptionChanges.dispose();
+        this._megolmDecryptionPreparation.dispose();
     }
 }
 

src/matrix/e2ee/megolm/Decryption.js

@@ -21,7 +21,7 @@ import {SessionInfo} from "./decryption/SessionInfo.js";
 import {DecryptionPreparation} from "./decryption/DecryptionPreparation.js";
 import {SessionDecryption} from "./decryption/SessionDecryption.js";
 import {SessionCache} from "./decryption/SessionCache.js";
-import {DecryptionWorker} from "./decryption/DecryptionWorker.js";
+import {DecryptionWorker, WorkerPool} from "./decryption/DecryptionWorker.js";
 
 function getSenderKey(event) {
     return event.content?.["sender_key"];
@@ -40,7 +40,7 @@ export class Decryption {
         this._pickleKey = pickleKey;
         this._olm = olm;
         // this._decryptor = new DecryptionWorker(new Worker("./src/worker.js"));
-        this._decryptor = new DecryptionWorker(new Worker("worker-3074010154.js"));
+        this._decryptor = new DecryptionWorker(new WorkerPool("worker-1039452087.js", 4));
         this._initPromise = this._decryptor.init();
     }
 

src/matrix/e2ee/megolm/decryption/DecryptionWorker.js

@@ -14,51 +14,200 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-export class DecryptionWorker {
+import {AbortError} from "../../../../utils/error.js";
+
+class WorkerState {
     constructor(worker) {
-        this._worker = worker;
+        this.worker = worker;
+        this.busy = false;
+    }
+
+    attach(pool) {
+        this.worker.addEventListener("message", pool);
+        this.worker.addEventListener("error", pool);
+    }
+
+    detach(pool) {
+        this.worker.removeEventListener("message", pool);
+        this.worker.removeEventListener("error", pool);
+    }
+}
+
+class Request {
+    constructor(message, pool) {
+        this._promise = new Promise((_resolve, _reject) => {
+            this._resolve = _resolve;
+            this._reject = _reject;
+        });
+        this._message = message;
+        this._pool = pool;
+        this._worker = null;
+    }
+
+    abort() {
+        if (this._isNotDisposed) {
+            this._pool._abortRequest(this);
+            this._dispose();
+        }
+    }
+
+    response() {
+        return this._promise;
+    }
+
+    _dispose() {
+        this._reject = null;
+        this._resolve = null;
+    }
+
+    get _isNotDisposed() {
+        return this._resolve && this._reject;
+    }
+}
+
+export class WorkerPool {
+    constructor(path, amount) {
+        this._workers = [];
+        for (let i = 0; i < amount ; ++i) {
+            const worker = new WorkerState(new Worker(path));
+            worker.attach(this);
+            this._workers[i] = worker;
+        }
         this._requests = new Map();
         this._counter = 0;
-        this._worker.addEventListener("message", this);
+        this._pendingFlag = false;
     }
 
     handleEvent(e) {
         if (e.type === "message") {
             const message = e.data;
-            console.log("worker reply", message);
             const request = this._requests.get(message.replyToId);
             if (request) {
+                request._worker.busy = false;
+                if (request._isNotDisposed) {
                     if (message.type === "success") {
-                    request.resolve(message.payload);
+                        request._resolve(message.payload);
                     } else if (message.type === "error") {
-                    request.reject(new Error(message.stack));
+                        request._reject(new Error(message.stack));
                     }
-                this._requests.delete(message.ref_id);
+                    request._dispose();
+                }
+                this._requests.delete(message.replyToId);
+            }
+            console.log("got worker reply", message, this._requests.size);
+            this._sendPending();
+        } else if (e.type === "error") {
+            console.error("worker error", e);
+        }
+    }
+
+    _getPendingRequest() {
+        for (const r of this._requests.values()) {
+            if (!r._worker) {
+                return r;
             }
         }
     }
 
-    _send(message) {
+    _getFreeWorker() {
+        for (const w of this._workers) {
+            if (!w.busy) {
+                return w;
+            }
+        }
+    }
+
+    _sendPending() {
+        this._pendingFlag = false;
+        console.log("seeing if there is anything to send", this._requests.size);
+        let success;
+        do {
+            success = false;
+            const request = this._getPendingRequest();
+            if (request) {
+                console.log("sending pending request", request);
+                const worker = this._getFreeWorker();
+                if (worker) {
+                    this._sendWith(request, worker);
+                    success = true;
+                }
+            }
+        } while (success);
+    }
+
+    _sendWith(request, worker) {
+        request._worker = worker;
+        worker.busy = true;
+        console.log("sending message to worker", request._message);
+        worker.worker.postMessage(request._message);
+    }
+
+    _enqueueRequest(message) {
         this._counter += 1;
         message.id = this._counter;
-        let resolve;
-        let reject;
-        const promise = new Promise((_resolve, _reject) => {
-            resolve = _resolve;
-            reject = _reject;
+        const request = new Request(message, this);
+        this._requests.set(message.id, request);
+        return request;
+    }
+
+    send(message) {
+        const request = this._enqueueRequest(message);
+        const worker = this._getFreeWorker();
+        if (worker) {
+            this._sendWith(request, worker);
+        }
+        return request;
+    }
+
+    // assumes all workers are free atm
+    sendAll(message) {
+        const promises = this._workers.map(worker => {
+            const request = this._enqueueRequest(message);
+            this._sendWith(request, worker);
+            return request.response();
         });
-        this._requests.set(message.id, {reject, resolve});
-        this._worker.postMessage(message);
-        return promise;
+        return Promise.all(promises);
+    }
+
+    dispose() {
+        for (const w of this._workers) {
+            w.worker.terminate();
+            w.detach(this);
+        }
+    }
+
+    _trySendPendingInNextTick() {
+        if (!this._pendingFlag) {
+            this._pendingFlag = true;
+            Promise.resolve().then(() => {
+                this._sendPending();
+            });
+        }
+    }
+
+    _abortRequest(request) {
+        request._reject(new AbortError());
+        if (request._worker) {
+            request._worker.busy = false;
+        }
+        this._requests.delete(request._message.id);
+        // allow more requests to be aborted before trying to send other pending
+        this._trySendPendingInNextTick();
+    }
+}
+
+export class DecryptionWorker {
+    constructor(workerPool) {
+        this._workerPool = workerPool;
     }
 
     decrypt(session, ciphertext) {
         const sessionKey = session.export_session(session.first_known_index());
-        return this._send({type: "megolm_decrypt", ciphertext, sessionKey});
+        return this._workerPool.send({type: "megolm_decrypt", ciphertext, sessionKey});
     }
 
-    init() {
-        return this._send({type: "load_olm", path: "olm_legacy-3232457086.js"});
+    async init() {
+        await this._workerPool.sendAll({type: "load_olm", path: "olm_legacy-3232457086.js"});
         // return this._send({type: "load_olm", path: "../lib/olm/olm_legacy.js"});
     }
 }

src/matrix/e2ee/megolm/decryption/SessionDecryption.js

@@ -27,6 +27,7 @@ export class SessionDecryption {
         this._sessionInfo = sessionInfo;
         this._events = events;
         this._decryptor = decryptor;
+        this._decryptionRequests = decryptor ? [] : null;
     }
 
     async decryptAll() {
@@ -39,7 +40,16 @@ export class SessionDecryption {
             try {
                 const {session} = this._sessionInfo;
                 const ciphertext = event.content.ciphertext;
-                const {plaintext, message_index: messageIndex} = await this._decryptor.decrypt(session, ciphertext);
+                let decryptionResult;
+                if (this._decryptor) {
+                    const request = this._decryptor.decrypt(session, ciphertext);
+                    this._decryptionRequests.push(request);
+                    decryptionResult = await request.response();
+                } else {
+                    decryptionResult = session.decrypt(ciphertext);
+                }
+                const plaintext = decryptionResult.plaintext;
+                const messageIndex = decryptionResult.message_index;
                 let payload;
                 try {
                     payload = JSON.parse(plaintext);
@@ -54,6 +64,10 @@ export class SessionDecryption {
                 const result = new DecryptionResult(payload, this._sessionInfo.senderKey, this._sessionInfo.claimedKeys);
                 results.set(event.event_id, result);
             } catch (err) {
+                // ignore AbortError from cancelling decryption requests in dispose method
+                if (err.name === "AbortError") {
+                    return;
+                }
                 if (!errors) {
                     errors = new Map();
                 }
@@ -65,6 +79,12 @@ export class SessionDecryption {
     }
 
     dispose() {
+        if (this._decryptionRequests) {
+            for (const r of this._decryptionRequests) {
+                r.abort();
+            }
+        }
+        // TODO: cancel decryptions here
         this._sessionInfo.release();
     }
 }

src/matrix/room/Room.js

@@ -65,7 +65,8 @@ export class Room extends EventEmitter {
                         retryEntries.push(new EventEntry(storageEntry, this._fragmentIdComparer));
                     }
                 }
-                await this._decryptEntries(DecryptionSource.Retry, retryEntries, txn);
+                const decryptRequest = this._decryptEntries(DecryptionSource.Retry, retryEntries, txn);
+                await decryptRequest.complete();
                 if (this._timeline) {
                     // only adds if already present
                     this._timeline.replaceEntries(retryEntries);
@@ -89,16 +90,22 @@ export class Room extends EventEmitter {
      * Used for decrypting when loading/filling the timeline, and retrying decryption,
      * not during sync, where it is split up during the multiple phases.
      */
-    async _decryptEntries(source, entries, inboundSessionTxn = null) {
+    _decryptEntries(source, entries, inboundSessionTxn = null) {
+        const request = new DecryptionRequest(async r => {
             if (!inboundSessionTxn) {
                 inboundSessionTxn = await this._storage.readTxn([this._storage.storeNames.inboundGroupSessions]);
             }
+            if (r.cancelled) return;
             const events = entries.filter(entry => {
                 return entry.eventType === EVENT_ENCRYPTED_TYPE;
             }).map(entry => entry.event);
             const isTimelineOpen = this._isTimelineOpen;
-        const preparation = await this._roomEncryption.prepareDecryptAll(events, source, isTimelineOpen, inboundSessionTxn);
-        const changes = await preparation.decrypt();
+            r.preparation = await this._roomEncryption.prepareDecryptAll(events, source, isTimelineOpen, inboundSessionTxn);
+            if (r.cancelled) return;
+            // TODO: should this throw an AbortError?
+            const changes = await r.preparation.decrypt();
+            r.preparation = null;
+            if (r.cancelled) return;
             const stores = [this._storage.storeNames.groupSessionDecryptions];
             if (isTimelineOpen) {
                 // read to fetch devices if timeline is open
@@ -114,6 +121,8 @@ export class Room extends EventEmitter {
             }
             await writeTxn.complete();
             decryption.applyToEntries(entries);
+        });
+        return request;
     }
 
     get needsPrepareSync() {
@@ -349,7 +358,8 @@ export class Room extends EventEmitter {
         }
         await txn.complete();
         if (this._roomEncryption) {
-            await this._decryptEntries(DecryptionSource.Timeline, gapResult.entries);
+            const decryptRequest = this._decryptEntries(DecryptionSource.Timeline, gapResult.entries);
+            await decryptRequest.complete();
         }
         // once txn is committed, update in-memory state & emit events
         for (const fragment of gapResult.fragments) {
@@ -461,7 +471,7 @@ export class Room extends EventEmitter {
     }
 
     /** @public */
-    async openTimeline() {
+    openTimeline() {
         if (this._timeline) {
             throw new Error("not dealing with load race here for now");
         }
@@ -483,7 +493,6 @@ export class Room extends EventEmitter {
         if (this._roomEncryption) {
             this._timeline.enableEncryption(this._decryptEntries.bind(this, DecryptionSource.Timeline));
         }
-        await this._timeline.load();
         return this._timeline;
     }
 
@@ -502,3 +511,25 @@ export class Room extends EventEmitter {
     }
 }
 
+class DecryptionRequest {
+    constructor(decryptFn) {
+        this._cancelled = false;
+        this.preparation = null;
+        this._promise = decryptFn(this);
+    }
+
+    complete() {
+        return this._promise;
+    }
+
+    get cancelled() {
+        return this._cancelled;
+    }
+
+    dispose() {
+        this._cancelled = true;
+        if (this.preparation) {
+            this.preparation.dispose();
+        }
+    }
+}

src/matrix/room/timeline/Timeline.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import {SortedArray, MappedList, ConcatList} from "../../../observable/index.js";
+import {Disposables} from "../../../utils/Disposables.js";
 import {Direction} from "./Direction.js";
 import {TimelineReader} from "./persistence/TimelineReader.js";
 import {PendingEventEntry} from "./entries/PendingEventEntry.js";
@@ -26,12 +27,14 @@ export class Timeline {
         this._storage = storage;
         this._closeCallback = closeCallback;
         this._fragmentIdComparer = fragmentIdComparer;
+        this._disposables = new Disposables();
         this._remoteEntries = new SortedArray((a, b) => a.compare(b));
         this._timelineReader = new TimelineReader({
             roomId: this._roomId,
             storage: this._storage,
             fragmentIdComparer: this._fragmentIdComparer
         });
+        this._readerRequest = null;
         const localEntries = new MappedList(pendingEvents, pe => {
             return new PendingEventEntry({pendingEvent: pe, user});
         }, (pee, params) => {
@@ -42,8 +45,14 @@ export class Timeline {
 
     /** @package */
     async load() {
-        const entries = await this._timelineReader.readFromEnd(25);
+        // 30 seems to be a good amount to fill the entire screen
+        const readerRequest = this._disposables.track(this._timelineReader.readFromEnd(30));
+        try {
+            const entries = await readerRequest.complete();
             this._remoteEntries.setManySorted(entries);
+        } finally {
+            this._disposables.disposeTracked(readerRequest);
+        }
     }
 
     replaceEntries(entries) {
@@ -71,12 +80,17 @@ export class Timeline {
         if (!firstEventEntry) {
             return;
         }
-        const entries = await this._timelineReader.readFrom(
+        const readerRequest = this._disposables.track(this._timelineReader.readFrom(
             firstEventEntry.asEventKey(),
             Direction.Backward,
             amount
-        );
+        ));
+        try {
+            const entries = await readerRequest.complete();
             this._remoteEntries.setManySorted(entries);
+        } finally {
+            this._disposables.disposeTracked(readerRequest);
+        }
     }
 
     /** @public */
@@ -87,6 +101,8 @@ export class Timeline {
     /** @public */
     close() {
         if (this._closeCallback) {
+            this._readerRequest?.dispose();
+            this._readerRequest = null;
             this._closeCallback();
             this._closeCallback = null;
         }

src/matrix/room/timeline/persistence/TimelineReader.js

@@ -19,6 +19,24 @@ import {Direction} from "../Direction.js";
 import {EventEntry} from "../entries/EventEntry.js";
 import {FragmentBoundaryEntry} from "../entries/FragmentBoundaryEntry.js";
 
+class ReaderRequest {
+    constructor(fn) {
+        this.decryptRequest = null;
+        this._promise = fn(this);
+    }
+
+    complete() {
+        return this._promise;
+    }
+
+    dispose() {
+        if (this.decryptRequest) {
+            this.decryptRequest.dispose();
+            this.decryptRequest = null;
+        }
+    }
+}
+
 export class TimelineReader {
     constructor({roomId, storage, fragmentIdComparer}) {
         this._roomId = roomId;
@@ -42,12 +60,33 @@ export class TimelineReader {
         return this._storage.readTxn(stores);
     }
 
-    async readFrom(eventKey, direction, amount) {
+    readFrom(eventKey, direction, amount) {
+        return new ReaderRequest(async r => {
             const txn = await this._openTxn();
-        return await this._readFrom(eventKey, direction, amount, txn);
+            return await this._readFrom(eventKey, direction, amount, r, txn);
+        });
     }
 
-    async _readFrom(eventKey, direction, amount, txn) {
+    readFromEnd(amount) {
+        return new ReaderRequest(async r => {
+            const txn = await this._openTxn();
+            const liveFragment = await txn.timelineFragments.liveFragment(this._roomId);
+            let entries;
+            // room hasn't been synced yet
+            if (!liveFragment) {
+                entries = [];
+            } else {
+                this._fragmentIdComparer.add(liveFragment);
+                const liveFragmentEntry = FragmentBoundaryEntry.end(liveFragment, this._fragmentIdComparer);
+                const eventKey = liveFragmentEntry.asEventKey();
+                entries = await this._readFrom(eventKey, Direction.Backward, amount, r, txn);
+                entries.unshift(liveFragmentEntry);
+            }
+            return entries;
+        });
+    }
+
+    async _readFrom(eventKey, direction, amount, r, txn) {
         let entries = [];
         const timelineStore = txn.timelineEvents;
         const fragmentStore = txn.timelineFragments;
@@ -83,25 +122,12 @@ export class TimelineReader {
         }
 
         if (this._decryptEntries) {
-            await this._decryptEntries(entries, txn);
+            r.decryptRequest = this._decryptEntries(entries, txn);
+            try {
+                await r.decryptRequest.complete();
+            } finally {
+                r.decryptRequest = null;
             }
-
-        return entries;
-    }
-
-    async readFromEnd(amount) {
-        const txn = await this._openTxn();
-        const liveFragment = await txn.timelineFragments.liveFragment(this._roomId);
-        let entries;
-        // room hasn't been synced yet
-        if (!liveFragment) {
-            entries = [];
-        } else {
-            this._fragmentIdComparer.add(liveFragment);
-            const liveFragmentEntry = FragmentBoundaryEntry.end(liveFragment, this._fragmentIdComparer);
-            const eventKey = liveFragmentEntry.asEventKey();
-            entries = await this._readFrom(eventKey, Direction.Backward, amount, txn);
-            entries.unshift(liveFragmentEntry);
         }
         return entries;
     }

src/utils/Disposables.js

@@ -29,6 +29,7 @@ export class Disposables {
 
     track(disposable) {
         this._disposables.push(disposable);
+        return disposable;
     }
 
     dispose() {

src/worker-polyfill.js

@@ -14,6 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+
 // polyfills needed for IE11
+// just enough to run olm, have promises and async/await
 import "regenerator-runtime/runtime";
 import "core-js/modules/es.promise";
+import "core-js/modules/es.math.imul";
+import "core-js/modules/es.math.clz32";

src/worker.js

@@ -94,13 +94,13 @@ class MessageHandler {
     }
 
     async _handleMessage(message) {
-        switch (message.type) {
-            case "load_olm":
+        const {type} = message;
+        if (type === "ping") {
+            this._sendReply(message, {type: "pong"});
+        } else if (type === "load_olm") {
             this._sendReply(message, await this._loadOlm(message.path));
-                break;
-            case "megolm_decrypt":
+        } else if (type === "megolm_decrypt") {
             this._sendReply(message, this._megolmDecrypt(message.sessionKey, message.ciphertext));
-                break;
         }
     }
 }