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This commit is contained in:
Bruno Windels 2020-04-05 15:11:15 +02:00
parent c980f682c6
commit ef267ca331
8 changed files with 118 additions and 94 deletions
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16
doc/impl-thoughts/RECONNECTING.md
View file

@ -1,22 +1,22 @@
# Reconnecting
`HomeServerApi` notifies `Reconnecter` of network call failure
`HomeServerApi` notifies `Reconnector` of network call failure
`Reconnecter` listens for online/offline event
`Reconnector` listens for online/offline event
`Reconnecter` polls `/versions` with a `RetryDelay` (implemented as ExponentialRetryDelay, also used by SendScheduler if no retry_after_ms is given)
`Reconnector` polls `/versions` with a `RetryDelay` (implemented as ExponentialRetryDelay, also used by SendScheduler if no retry_after_ms is given)
`Reconnecter` emits an event when sync and message sending should retry
`Reconnector` emits an event when sync and message sending should retry
`Sync` listen to `Reconnecter`
`Sync` listen to `Reconnector`
`Sync` notifies when the catchup sync has happened
`Reconnecter` has state:
`Reconnector` has state:
- disconnected (and retrying at x seconds from timestamp)
- reconnecting (call /versions, and if successful /sync)
- connected
`Reconnecter` has a method to try to connect now
`Reconnector` has a method to try to connect now
`SessionStatus` can be:
- disconnected (and retrying at x seconds from timestamp)
@ -31,4 +31,4 @@ rooms should report how many messages they have queued up, and each time they se
`SendReporter` (passed from `Session` to `Room`, passed down to `SendQueue`), with:
- setPendingEventCount(roomId, count)
`Session` listens to `Reconnecter` to update it's status, but perhaps we wait to send messages until catchup sync is done
`Session` listens to `Reconnector` to update it's status, but perhaps we wait to send messages until catchup sync is done

16
src/domain/BrawlViewModel.js
View file

@ -126,7 +126,11 @@ export default class BrawlViewModel extends EventEmitter {
try {
this._loading = true;
this._loadingText = "Loading your conversations…";
const hsApi = this._createHsApi(sessionInfo.homeServer, sessionInfo.accessToken);
const reconnector = new Reconnector(
new ExponentialRetryDelay(2000, this._clock.createTimeout),
this._clock.createMeasure
);
const hsApi = this._createHsApi(sessionInfo.homeServer, sessionInfo.accessToken, reconnector);
const storage = await this._storageFactory.create(sessionInfo.id);
// no need to pass access token to session
const filteredSessionInfo = {
@ -136,10 +140,16 @@ export default class BrawlViewModel extends EventEmitter {
};
const session = new Session({storage, sessionInfo: filteredSessionInfo, hsApi});
// show spinner now, with title loading stored data?
this.emit("change", "activeSection");
await session.load();
const sync = new Sync({hsApi, storage, session});
const sync = new Sync({hsApi, storage, session});
reconnector.on("state", state => {
if (state === ConnectionState.Online) {
sync.start();
session.notifyNetworkAvailable(reconnector.lastVersionsResponse);
}
});
const needsInitialSync = !session.syncToken;
if (!needsInitialSync) {

6
src/main.js
View file

@ -5,6 +5,7 @@ import StorageFactory from "./matrix/storage/idb/create.js";
import SessionsStore from "./matrix/sessions-store/localstorage/SessionsStore.js";
import BrawlViewModel from "./domain/BrawlViewModel.js";
import BrawlView from "./ui/web/BrawlView.js";
import DOMClock from "./utils/DOMClock.js";
export default async function main(container) {
try {
@ -17,14 +18,13 @@ export default async function main(container) {
// const recorder = new RecordRequester(fetchRequest);
// const request = recorder.request;
// window.getBrawlFetchLog = () => recorder.log();
// normal network:
const request = fetchRequest;
const vm = new BrawlViewModel({
storageFactory: new StorageFactory(),
createHsApi: (homeServer, accessToken = null) => new HomeServerApi({homeServer, accessToken, request}),
createHsApi: (homeServer, accessToken, reconnector) => new HomeServerApi({homeServer, accessToken, request, reconnector}),
sessionStore: new SessionsStore("brawl_sessions_v1"),
clock: Date //just for `now` fn
clock: new DOMClock(),
});
await vm.load();
const view = new BrawlView(vm);

93
src/matrix/Reconnecter.js → src/matrix/Reconnector.js
View file

@ -1,53 +1,49 @@
class Clock {
// use cases
// StopWatch: not sure I like that name ... but measure time difference from start to current time
// Timeout: wait for a given number of ms, and be able to interrupt the wait
// Clock.timeout() -> creates a new timeout?
// Now: get current timestamp
// Clock.now(), or pass Clock.now so others can do now()
//
// should use subinterfaces so we can only pass part needed to other constructors
//
}
// need to prevent memory leaks here!
export class DomOnlineDetected {
constructor(reconnecter) {
constructor(reconnector) {
// window.addEventListener('offline', () => appendOnlineStatus(false));
// window.addEventListener('online', () => appendOnlineStatus(true));
// appendOnlineStatus(navigator.onLine);
// on online, reconnecter.tryNow()
// on online, reconnector.tryNow()
}
}
export class ExponentialRetryDelay {
constructor(start = 2000, delay) {
constructor(start = 2000, createTimeout) {
this._start = start;
this._current = start;
this._delay = delay;
this._createTimeout = createTimeout;
this._max = 60 * 5 * 1000; //5 min
this._timer = null;
this._timeout = null;
}
async waitForRetry() {
this._timer = this._delay(this._current);
this._timeout = this._createTimeout(this._current);
try {
await this._timer.timeout();
await this._timeout.elapsed();
// only increase delay if we didn't get interrupted
const seconds = this._current / 1000;
const powerOfTwo = (seconds * seconds) * 1000;
this._current = Math.max(this._max, powerOfTwo);
} catch(err) {
// swallow AbortError, means skipWaiting was called
if (!(err instanceof AbortError)) {
throw err;
}
} finally {
this._timer = null;
this._timeout = null;
}
}
skipWaiting() {
if (this._timeout) {
this._timeout.abort();
}
}
reset() {
this._current = this._start;
if (this._timer) {
this._timer.abort();
}
this.skipWaiting();
}
get nextValue() {
@ -80,13 +76,12 @@ export const ConnectionState = createEnum(
"Online"
);
export class Reconnecter {
constructor({hsApi, retryDelay, clock}) {
export class Reconnector {
constructor({retryDelay, createTimeMeasure}) {
this._online
this._retryDelay = retryDelay;
this._currentDelay = null;
this._hsApi = hsApi;
this._clock = clock;
this._createTimeMeasure = createTimeMeasure;
// assume online, and do our thing when something fails
this._state = ConnectionState.Online;
this._isReconnecting = false;
@ -102,25 +97,22 @@ export class Reconnecter {
}
get retryIn() {
return this._stateSince.measure();
if (this._state === ConnectionState.Waiting) {
return this._retryDelay.nextValue - this._stateSince.measure();
}
return 0;
}
onRequestFailed() {
onRequestFailed(hsApi) {
if (!this._isReconnecting) {
this._setState(ConnectionState.Offline);
// do something with versions response of loop here?
// we might want to pass it to session to know what server supports?
// so emit it ...
this._reconnectLoop();
// start loop
this._reconnectLoop(hsApi);
}
}
// don't throw from here
tryNow() {
// skip waiting
if (this._currentDelay) {
this._currentDelay.abort();
if (this._retryDelay) {
this._retryDelay.skipWaiting();
}
}
@ -128,7 +120,7 @@ export class Reconnecter {
if (state !== this._state) {
this._state = state;
if (this._state === ConnectionState.Waiting) {
this._stateSince = this._clock.stopwatch();
this._stateSince = this._createTimeMeasure();
} else {
this._stateSince = null;
}
@ -136,30 +128,23 @@ export class Reconnecter {
}
}
async _reconnectLoop() {
async _reconnectLoop(hsApi) {
this._isReconnecting = true;
this._retryDelay.reset();
this._versionsResponse = null;
this._retryDelay.reset();
while (!this._versionsResponse) {
// TODO: should we wait first or request first?
// as we've just failed a request? I guess no harm in trying immediately
try {
this._setState(ConnectionState.Reconnecting);
const versionsRequest = this._hsApi.versions(10000);
// use 10s timeout, because we don't want to be waiting for
// a stale connection when we just came online again
const versionsRequest = hsApi.versions({timeout: 10000});
this._versionsResponse = await versionsRequest.response();
this._setState(ConnectionState.Online);
} catch (err) {
// NetworkError or AbortError from timeout
this._setState(ConnectionState.Waiting);
this._currentDelay = this._retryDelay.next();
try {
await this._currentDelay
} catch (err) {
// waiting interrupted, we should retry immediately,
// swallow error
} finally {
this._currentDelay = null;
}
await this._retryDelay.waitForRetry();
}
}
}

71
src/matrix/hs-api.js
View file

@ -1,5 +1,6 @@
import {
HomeServerError,
NetworkError,
} from "./error.js";
class RequestWrapper {
@ -28,19 +29,21 @@ class RequestWrapper {
}
export default class HomeServerApi {
constructor({homeServer, accessToken, request}) {
constructor({homeServer, accessToken, request, createTimeout, reconnector}) {
// store these both in a closure somehow so it's harder to get at in case of XSS?
// one could change the homeserver as well so the token gets sent there, so both must be protected from read/write
this._homeserver = homeServer;
this._accessToken = accessToken;
this._requestFn = request;
this._createTimeout = createTimeout;
this._reconnector = reconnector;
}
_url(csPath) {
return `${this._homeserver}/_matrix/client/r0${csPath}`;
}
_request(method, url, queryParams = {}, body) {
_request(method, url, queryParams = {}, body, options) {
const queryString = Object.entries(queryParams)
.filter(([, value]) => value !== undefined)
.map(([name, value]) => {
@ -66,51 +69,73 @@ export default class HomeServerApi {
headers,
body: bodyString,
});
return new RequestWrapper(method, url, requestResult);
if (options.timeout) {
const timeout = this._createTimeout(options.timeout);
// abort request if timeout finishes first
timeout.elapsed().then(
() => requestResult.abort(),
() => {} // ignore AbortError
);
// abort timeout if request finishes first
requestResult.response().then(() => timeout.abort());
}
const wrapper = new RequestWrapper(method, url, requestResult);
if (this._reconnector) {
wrapper.response().catch(err => {
if (err instanceof NetworkError) {
this._reconnector.onRequestFailed(this);
}
});
}
return wrapper;
}
_post(csPath, queryParams, body) {
return this._request("POST", this._url(csPath), queryParams, body);
_post(csPath, queryParams, body, options) {
return this._request("POST", this._url(csPath), queryParams, body, options);
}
_put(csPath, queryParams, body) {
return this._request("PUT", this._url(csPath), queryParams, body);
_put(csPath, queryParams, body, options) {
return this._request("PUT", this._url(csPath), queryParams, body, options);
}
_get(csPath, queryParams, body) {
return this._request("GET", this._url(csPath), queryParams, body);
_get(csPath, queryParams, body, options) {
return this._request("GET", this._url(csPath), queryParams, body, options);
}
sync(since, filter, timeout) {
return this._get("/sync", {since, timeout, filter});
sync(since, filter, timeout, options = null) {
return this._get("/sync", {since, timeout, filter}, null, options);
}
// params is from, dir and optionally to, limit, filter.
messages(roomId, params) {
return this._get(`/rooms/${encodeURIComponent(roomId)}/messages`, params);
messages(roomId, params, options = null) {
return this._get(`/rooms/${encodeURIComponent(roomId)}/messages`, params, null, options);
}
send(roomId, eventType, txnId, content) {
return this._put(`/rooms/${encodeURIComponent(roomId)}/send/${encodeURIComponent(eventType)}/${encodeURIComponent(txnId)}`, {}, content);
send(roomId, eventType, txnId, content, options = null) {
return this._put(`/rooms/${encodeURIComponent(roomId)}/send/${encodeURIComponent(eventType)}/${encodeURIComponent(txnId)}`, {}, content, options);
}
passwordLogin(username, password) {
return this._post("/login", undefined, {
passwordLogin(username, password, options = null) {
return this._post("/login", null, {
"type": "m.login.password",
"identifier": {
"type": "m.id.user",
"user": username
},
"password": password
});
}, options);
}
createFilter(userId, filter) {
return this._post(`/user/${encodeURIComponent(userId)}/filter`, undefined, filter);
createFilter(userId, filter, options = null) {
return this._post(`/user/${encodeURIComponent(userId)}/filter`, null, filter, options);
}
versions(timeout) {
// TODO: implement timeout
return this._request("GET", `${this._homeserver}/_matrix/client/versions`);
versions(options = null) {
return this._request("GET", `${this._homeserver}/_matrix/client/versions`, null, options);
}
}

2
src/matrix/session.js
View file

@ -40,7 +40,7 @@ export default class Session {
}));
}
notifyNetworkAvailable() {
notifyNetworkAvailable(lastVersionResponse) {
for (const [, room] of this._rooms) {
room.resumeSending();
}

1
src/matrix/sync.js
View file

@ -33,6 +33,7 @@ export default class Sync extends EventEmitter {
return this._isSyncing;
}
// this should not throw?
// returns when initial sync is done
async start() {
if (this._isSyncing) {

7
src/utils/DOMClock.js
View file

@ -3,22 +3,25 @@ import {AbortError} from "./error.js";
class DOMTimeout {
constructor(ms) {
this._reject = null;
this._handle = null;
this._promise = new Promise((resolve, reject) => {
this._reject = reject;
setTimeout(() => {
this._handle = setTimeout(() => {
this._reject = null;
resolve();
}, ms);
});
}
get elapsed() {
elapsed() {
return this._promise;
}
abort() {
if (this._reject) {
this._reject(new AbortError());
clearTimeout(this._handle);
this._handle = null;
this._reject = null;
}
}