@microsoft/teams.apps
Version:
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371 lines • 33.9 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.GeoSocket = void 0;
const envelope_1 = require("./envelope");
/** Keep a superseded socket alive while APX connection-ID caches expire. */
const CONNECTION_HANDOFF_MS = 5_000;
/**
* Supervises one Socket Mode connection for a single geo, including readiness,
* reconnection, and proactive token refresh.
*/
class GeoSocket {
deps;
geo;
negotiateUrl;
log;
/** Monotonic connection generation. */
generation = 0;
/** The ready generation receiving new backend traffic. */
active;
/** Prior generations serving cached deliveries and draining SDK replies. */
retiring = new Map();
supervisorLoop;
refreshTimer;
_status = 'idle';
/** Settles when the current connection terminates and drives the supervisor. */
closed = Promise.resolve({ planned: false });
constructor(deps, geo, negotiateUrl, log) {
this.deps = deps;
this.geo = geo;
this.negotiateUrl = negotiateUrl;
this.log = log;
}
get status() {
return this._status;
}
/** Accept frames from the active socket and its draining predecessors. */
canDispatch(gen) {
return (this.deps.isAccepting() &&
(this.active?.gen === gen || this.retiring.has(gen)));
}
/**
* Establish the initial connection within the configured startup budget.
*/
async startInitial() {
this._status = 'connecting';
const deadline = Date.now() + this.deps.startupTimeoutMs;
let attempt = 0;
let lastError;
this.log.debug(`socket-mode[${this.geo}]: starting initial connection with a ${this.deps.startupTimeoutMs}ms startup budget`);
while (this.deps.isAccepting()) {
const gen = ++this.generation;
try {
this.closed = (await this.connectCycle(gen)).closed;
this._status = 'ready';
this.log.debug(`socket-mode[${this.geo}]: initial connection is ready`);
return;
}
catch (err) {
lastError = err;
if (!this.deps.isAccepting())
break;
if (this.deps.isNonRetryable(err)) {
// Thrown to App.start(), which reports it through the app `error` event.
this.log.debug(`socket-mode[${this.geo}]: initial connection rejected with a non-retryable error; not retrying`);
throw err;
}
const delay = this.deps.retryAfterOf(err) ?? this.deps.backoffDelay(attempt);
attempt++;
if (Date.now() + delay >= deadline)
break;
this.log.warn(`socket-mode[${this.geo}]: initial connect attempt ${attempt} failed; retrying in ${delay}ms`, err);
const slept = await this.deps.sleep(delay);
if (!slept)
break;
}
}
this.log.debug(`socket-mode[${this.geo}]: initial connection did not become ready within the startup budget`, lastError);
throw lastError ?? new Error(`Socket Mode failed to establish the initial connection for geo '${this.geo}'.`);
}
superviseInBackground() {
this.supervisorLoop = this.supervise().catch((err) => {
this.log.error(`socket-mode[${this.geo}]: reconnect supervisor stopped unexpectedly`, err);
});
}
/** Stop token refresh, every owned connection, and the reconnect supervisor. */
async stop() {
this.clearRefreshTimer();
const connections = this.releaseConnections();
await Promise.all(connections.map((connection) => connection.stop().catch(() => undefined)));
await this.supervisorLoop?.catch(() => undefined);
this._status = 'stopped';
}
async connectCycle(gen, replaces) {
let settled = false;
let settle;
const closed = new Promise((resolve) => {
settle = (reason) => {
if (!settled) {
settled = true;
resolve(reason);
}
};
});
const handlers = {
onActivity: async (envelope) => {
const arrivedAt = Date.now();
if (!this.canDispatch(gen)) {
this.log.debug('socket-mode: dropping activity received outside the active connection state');
return undefined;
}
const deadlineMs = (0, envelope_1.readField)(envelope, 'deadlineMs');
let deadline = arrivedAt;
if (deadlineMs !== undefined) {
if (typeof deadlineMs === 'number' && Number.isFinite(deadlineMs) && deadlineMs >= 0) {
deadline += deadlineMs;
}
else {
this.log.warn('socket-mode: invalid deadlineMs; no drain budget beyond the cache grace');
}
}
const activity = { deadline };
current.inFlight.add(activity);
this.scheduleDrain(current);
try {
return await this.deps.dispatch(envelope);
}
finally {
current.inFlight.delete(activity);
this.scheduleDrain(current);
}
},
onReady: (frame) => {
if (this.active && this.active.gen !== gen) {
this.retire(this.active);
}
this.active = current;
// Observers reading aggregate status from the ready event must see the
// settled value rather than the previous connecting state.
this._status = 'ready';
this.deps.onReady(frame);
},
onClosed: (error) => {
this.clearDrain(current);
if (this.active?.gen === gen) {
this.clearRefreshTimer();
if (settled && this.deps.isAccepting()) {
// A planned refresh already advanced the supervisor. If the active
// predecessor dies before its replacement is ready, surface the
// resulting delivery outage.
this.active = undefined;
this.reportDisconnected(error);
}
}
this.retiring.delete(gen);
settle({ planned: false, error });
},
};
const connection = this.deps.createConnection(this.negotiateUrl, handlers, replaces
? () => {
if (!this.deps.isAccepting() || this.active !== replaces || !replaces.connection.isOpen) {
return undefined;
}
const expiresAtMs = replaces.connection.expiresAtMs;
if (expiresAtMs !== undefined && Date.now() >= expiresAtMs) {
return undefined;
}
return replaces.connection.connectionId;
}
: undefined);
const current = { gen, connection, inFlight: new Set() };
await connection.start(this.deps.getAbortSignal());
this.scheduleTokenRefresh(gen, connection, () => settle({ planned: true }));
return { closed };
}
async supervise() {
let closed = this.closed;
while (this.deps.isAccepting()) {
const aborted = this.whenAborted();
let reason;
try {
reason = (await Promise.race([closed, aborted.promise])) ?? { planned: false };
}
finally {
// Avoid accumulating one abort listener per reconnect generation.
aborted.dispose();
}
if (!this.deps.isAccepting())
return;
const planned = reason.planned === true;
const error = reason.planned ? undefined : reason.error;
if (planned) {
// Keep the active generation serving while its replacement negotiates
// and waits for SocketReady.
this.log.info(`socket-mode[${this.geo}]: proactively rotating token; renegotiating a fresh connection`);
}
else {
this.reportDisconnected(error);
}
if (!planned) {
const dropped = this.active;
this.active = undefined;
await dropped?.connection.stop().catch(() => undefined);
}
const previous = planned ? this.active : undefined;
const next = await this.reconnect({ keepServing: planned, replaces: previous }, error);
if (!next)
return; // stopped while backing off
closed = next.closed;
this._status = 'ready';
if (planned) {
if (previous?.graceEndsAt !== undefined) {
this.log.info(`socket-mode[${this.geo}]: token rotated; inbound delivery continues for this geo`);
}
else {
this.log.info(`socket-mode[${this.geo}]: reconnected; inbound delivery resumed for this geo`);
this.deps.onReconnected();
}
}
else {
this.log.info(`socket-mode[${this.geo}]: reconnected; inbound delivery resumed for this geo`);
this.deps.onReconnected();
}
}
}
whenAborted() {
const signal = this.deps.getAbortSignal();
if (!signal || signal.aborted) {
return { promise: Promise.resolve(undefined), dispose: () => undefined };
}
let onAbort;
const promise = new Promise((resolve) => {
onAbort = () => resolve(undefined);
signal.addEventListener('abort', onAbort, { once: true });
});
return { promise, dispose: () => signal.removeEventListener('abort', onAbort) };
}
async reconnect(options, prevError) {
let attempt = 0;
let retryAfterMs = this.deps.retryAfterOf(prevError);
while (this.deps.isAccepting()) {
const delay = retryAfterMs ?? this.deps.backoffDelay(attempt);
attempt++;
const slept = await this.deps.sleep(delay);
if (!slept || !this.deps.isAccepting())
return undefined;
if (!options.keepServing) {
this._status = 'connecting';
}
const gen = ++this.generation;
try {
return await this.connectCycle(gen, options.replaces);
}
catch (err) {
// Negotiate isn't abortable, so a rejection can land after stop().
if (!this.deps.isAccepting())
return undefined;
if (this.deps.isNonRetryable(err)) {
await this.stopAfterNonRetryable(err);
return undefined;
}
retryAfterMs = this.deps.retryAfterOf(err);
this.log.warn(`socket-mode[${this.geo}]: reconnect attempt ${attempt} failed; will retry`, err);
}
}
return undefined;
}
/**
* Stop reconnecting after a 401/403: close every connection this geo owns
* (including a predecessor still serving during a planned rotation and any
* sockets in their handoff window), then report the outage with the auth
* error so listeners can see why delivery stopped.
*/
async stopAfterNonRetryable(error) {
this.log.error(`socket-mode[${this.geo}]: reconnect rejected with a non-retryable error; ` +
'inbound delivery for this geo has stopped until the app is restarted', error);
this.clearRefreshTimer();
// Clear before stopping so their onClosed callbacks do not report again.
const connections = this.releaseConnections();
await Promise.all(connections.map((connection) => connection.stop().catch(() => undefined)));
// stop() may have landed while the connections were closing.
if (!this.deps.isAccepting())
return;
this.reportDisconnected(error);
}
/**
* Mark this geo disconnected and emit the event. A non-retryable error means
* the geo has stopped for good; it skips the "paused" warning because
* {@link stopAfterNonRetryable} already logged the permanent stop.
*/
reportDisconnected(error) {
this._status = 'disconnected';
const terminal = error !== undefined && this.deps.isNonRetryable(error);
if (!terminal) {
if (error) {
this.log.warn(`socket-mode[${this.geo}]: disconnected; inbound delivery paused for this geo`, error);
}
else {
this.log.warn(`socket-mode[${this.geo}]: disconnected; inbound delivery paused for this geo`);
}
}
this.deps.onDisconnected(error, terminal);
}
retire(previous) {
previous.graceEndsAt = Date.now() + CONNECTION_HANDOFF_MS;
this.retiring.set(previous.gen, previous);
this.scheduleDrain(previous);
}
scheduleDrain(previous) {
if (this.retiring.get(previous.gen) !== previous || previous.graceEndsAt === undefined)
return;
clearTimeout(previous.drainTimer);
let closeAt = previous.graceEndsAt;
for (const activity of previous.inFlight) {
closeAt = Math.max(closeAt, activity.deadline);
}
// Even an empty drain closes on a timer, outside the SDK reply callback.
// Clamp the timer's range, not the message's deadline.
const delay = Math.min(Math.max(0, closeAt - Date.now()), 2_147_483_647);
previous.drainTimer = setTimeout(() => {
previous.drainTimer = undefined;
if (!this.deps.isAccepting() || this.retiring.get(previous.gen) !== previous)
return;
if (Date.now() < closeAt) {
this.scheduleDrain(previous);
return;
}
this.retiring.delete(previous.gen);
this.clearDrain(previous);
void previous.connection.stop().catch((error) => {
this.log.warn(`socket-mode[${this.geo}]: failed to stop a retired socket`, error);
});
}, delay);
previous.drainTimer.unref?.();
}
clearDrain(current) {
clearTimeout(current.drainTimer);
current.drainTimer = undefined;
current.inFlight.clear();
}
releaseConnections() {
const connections = [this.active, ...this.retiring.values()].filter((current) => current !== undefined);
this.active = undefined;
this.retiring.clear();
for (const current of connections)
this.clearDrain(current);
return connections.map((current) => current.connection);
}
scheduleTokenRefresh(gen, connection, triggerRefresh) {
this.clearRefreshTimer();
const { expiresInSeconds, expiresAtMs } = connection;
if (!expiresInSeconds || expiresInSeconds <= 0)
return;
const remainingMs = expiresAtMs === undefined ? expiresInSeconds * 1000 : expiresAtMs - Date.now();
const delay = Math.max(remainingMs - this.deps.tokenRefreshMarginMs, 1_000);
this.refreshTimer = setTimeout(() => {
if (!this.deps.isAccepting() || gen !== this.active?.gen)
return;
this.log.info(`socket-mode[${this.geo}]: proactively renegotiating before token expiry`);
triggerRefresh();
}, delay);
this.refreshTimer.unref?.();
}
clearRefreshTimer() {
if (this.refreshTimer) {
clearTimeout(this.refreshTimer);
this.refreshTimer = undefined;
}
}
}
exports.GeoSocket = GeoSocket;
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