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import { type Document } from './bson';
import { MongoInvalidArgumentError, MongoOperationTimeoutError, MongoRuntimeError } from './error';
import { type ClientSession } from './sessions';
import { csotMin, noop, squashError } from './utils';
/** @internal */
export class TimeoutError extends Error {
duration: number;
override get name(): 'TimeoutError' {
return 'TimeoutError';
}
constructor(message: string, options: { cause?: Error; duration: number }) {
super(message, options);
this.duration = options.duration;
}
static is(error: unknown): error is TimeoutError {
return (
error != null && typeof error === 'object' && 'name' in error && error.name === 'TimeoutError'
);
}
}
type Executor = ConstructorParameters<typeof Promise<never>>[0];
type Reject = Parameters<ConstructorParameters<typeof Promise<never>>[0]>[1];
/**
* @internal
* This class is an abstraction over timeouts
* The Timeout class can only be in the pending or rejected states. It is guaranteed not to resolve
* if interacted with exclusively through its public API
* */
export class Timeout extends Promise<never> {
private id?: NodeJS.Timeout;
public readonly start: number;
public ended: number | null = null;
public duration: number;
private timedOut = false;
public cleared = false;
get remainingTime(): number {
if (this.timedOut) return 0;
if (this.duration === 0) return Infinity;
return this.start + this.duration - Math.trunc(performance.now());
}
get timeElapsed(): number {
return Math.trunc(performance.now()) - this.start;
}
/** Create a new timeout that expires in `duration` ms */
private constructor(
executor: Executor = () => null,
options?: { duration: number; unref?: true; rejection?: Error }
) {
const duration = options?.duration ?? 0;
const unref = !!options?.unref;
const rejection = options?.rejection;
if (duration < 0) {
throw new MongoInvalidArgumentError('Cannot create a Timeout with a negative duration');
}
let reject!: Reject;
super((_, promiseReject) => {
reject = promiseReject;
executor(noop, promiseReject);
});
this.duration = duration;
this.start = Math.trunc(performance.now());
if (rejection == null && this.duration > 0) {
this.id = setTimeout(() => {
this.ended = Math.trunc(performance.now());
this.timedOut = true;
reject(new TimeoutError(`Expired after ${duration}ms`, { duration }));
}, this.duration);
Iif (typeof this.id.unref === 'function' && unref) {
// Ensure we do not keep the Node.js event loop running
this.id.unref();
}
} else if (rejection != null) {
this.ended = Math.trunc(performance.now());
this.timedOut = true;
reject(rejection);
}
}
/**
* Clears the underlying timeout. This method is idempotent
*/
clear(): void {
clearTimeout(this.id);
this.id = undefined;
this.timedOut = false;
this.cleared = true;
}
throwIfExpired(): void {
if (this.timedOut) {
// This method is invoked when someone wants to throw immediately instead of await the result of this promise
// Since they won't be handling the rejection from the promise (because we're about to throw here)
// attach handling to prevent this from bubbling up to Node.js
this.then(undefined, squashError);
throw new TimeoutError('Timed out', { duration: this.duration });
}
}
public static expires(duration: number, unref?: true): Timeout {
return new Timeout(undefined, { duration, unref });
}
static override reject(rejection?: Error): Timeout {
return new Timeout(undefined, { duration: 0, unref: true, rejection });
}
}
/** @internal */
export type TimeoutContextOptions = (LegacyTimeoutContextOptions | CSOTTimeoutContextOptions) & {
session?: ClientSession;
};
/** @internal */
export type LegacyTimeoutContextOptions = {
serverSelectionTimeoutMS: number;
waitQueueTimeoutMS: number;
socketTimeoutMS?: number;
};
/** @internal */
export type CSOTTimeoutContextOptions = {
timeoutMS: number;
serverSelectionTimeoutMS: number;
socketTimeoutMS?: number;
};
function isLegacyTimeoutContextOptions(v: unknown): v is LegacyTimeoutContextOptions {
return (
v != null &&
typeof v === 'object' &&
'serverSelectionTimeoutMS' in v &&
typeof v.serverSelectionTimeoutMS === 'number' &&
'waitQueueTimeoutMS' in v &&
typeof v.waitQueueTimeoutMS === 'number'
);
}
function isCSOTTimeoutContextOptions(v: unknown): v is CSOTTimeoutContextOptions {
return (
v != null &&
typeof v === 'object' &&
'serverSelectionTimeoutMS' in v &&
typeof v.serverSelectionTimeoutMS === 'number' &&
'timeoutMS' in v &&
typeof v.timeoutMS === 'number'
);
}
/** @internal */
export abstract class TimeoutContext {
static create(options: TimeoutContextOptions): TimeoutContext {
if (options.session?.timeoutContext != null) return options.session?.timeoutContext;
if (isCSOTTimeoutContextOptions(options)) return new CSOTTimeoutContext(options);
else Eif (isLegacyTimeoutContextOptions(options)) return new LegacyTimeoutContext(options);
else throw new MongoRuntimeError('Unrecognized options');
}
abstract get maxTimeMS(): number | null;
abstract get serverSelectionTimeout(): Timeout | null;
abstract get connectionCheckoutTimeout(): Timeout | null;
abstract get clearServerSelectionTimeout(): boolean;
abstract get timeoutForSocketWrite(): Timeout | null;
abstract get timeoutForSocketRead(): Timeout | null;
abstract csotEnabled(): this is CSOTTimeoutContext;
abstract refresh(): void;
abstract clear(): void;
/** Returns a new instance of the TimeoutContext, with all timeouts refreshed and restarted. */
abstract refreshed(): TimeoutContext;
abstract addMaxTimeMSToCommand(command: Document, options: { omitMaxTimeMS?: boolean }): void;
abstract getSocketTimeoutMS(): number | undefined;
}
/** @internal */
export class CSOTTimeoutContext extends TimeoutContext {
timeoutMS: number;
serverSelectionTimeoutMS: number;
socketTimeoutMS?: number;
clearServerSelectionTimeout: boolean;
private _serverSelectionTimeout?: Timeout | null;
private _connectionCheckoutTimeout?: Timeout | null;
public minRoundTripTime = 0;
public start: number;
constructor(options: CSOTTimeoutContextOptions) {
super();
this.start = Math.trunc(performance.now());
this.timeoutMS = options.timeoutMS;
this.serverSelectionTimeoutMS = options.serverSelectionTimeoutMS;
this.socketTimeoutMS = options.socketTimeoutMS;
this.clearServerSelectionTimeout = false;
}
get maxTimeMS(): number {
return this.remainingTimeMS - this.minRoundTripTime;
}
get remainingTimeMS() {
const timePassed = Math.trunc(performance.now()) - this.start;
return this.timeoutMS <= 0 ? Infinity : this.timeoutMS - timePassed;
}
csotEnabled(): this is CSOTTimeoutContext {
return true;
}
get serverSelectionTimeout(): Timeout | null {
// check for undefined
if (typeof this._serverSelectionTimeout !== 'object' || this._serverSelectionTimeout?.cleared) {
const { remainingTimeMS, serverSelectionTimeoutMS } = this;
if (remainingTimeMS <= 0)
return Timeout.reject(
new MongoOperationTimeoutError(`Timed out in server selection after ${this.timeoutMS}ms`)
);
const usingServerSelectionTimeoutMS =
serverSelectionTimeoutMS !== 0 &&
csotMin(remainingTimeMS, serverSelectionTimeoutMS) === serverSelectionTimeoutMS;
if (usingServerSelectionTimeoutMS) {
this._serverSelectionTimeout = Timeout.expires(serverSelectionTimeoutMS);
} else {
if (remainingTimeMS > 0 && Number.isFinite(remainingTimeMS)) {
this._serverSelectionTimeout = Timeout.expires(remainingTimeMS);
} else {
this._serverSelectionTimeout = null;
}
}
}
return this._serverSelectionTimeout;
}
get connectionCheckoutTimeout(): Timeout | null {
Eif (
typeof this._connectionCheckoutTimeout !== 'object' ||
this._connectionCheckoutTimeout?.cleared
) {
if (typeof this._serverSelectionTimeout === 'object') {
// null or Timeout
this._connectionCheckoutTimeout = this._serverSelectionTimeout;
} else {
throw new MongoRuntimeError(
'Unreachable. If you are seeing this error, please file a ticket on the NODE driver project on Jira'
);
}
}
return this._connectionCheckoutTimeout;
}
get timeoutForSocketWrite(): Timeout | null {
const { remainingTimeMS } = this;
Iif (!Number.isFinite(remainingTimeMS)) return null;
Eif (remainingTimeMS > 0) return Timeout.expires(remainingTimeMS);
return Timeout.reject(new MongoOperationTimeoutError('Timed out before socket write'));
}
get timeoutForSocketRead(): Timeout | null {
const { remainingTimeMS } = this;
if (!Number.isFinite(remainingTimeMS)) return null;
Eif (remainingTimeMS > 0) return Timeout.expires(remainingTimeMS);
return Timeout.reject(new MongoOperationTimeoutError('Timed out before socket read'));
}
refresh(): void {
this.start = Math.trunc(performance.now());
this.minRoundTripTime = 0;
this._serverSelectionTimeout?.clear();
this._connectionCheckoutTimeout?.clear();
}
clear(): void {
this._serverSelectionTimeout?.clear();
this._connectionCheckoutTimeout?.clear();
}
/**
* @internal
* Throws a MongoOperationTimeoutError if the context has expired.
* If the context has not expired, returns the `remainingTimeMS`
**/
getRemainingTimeMSOrThrow(message?: string): number {
const { remainingTimeMS } = this;
Iif (remainingTimeMS <= 0)
throw new MongoOperationTimeoutError(message ?? `Expired after ${this.timeoutMS}ms`);
return remainingTimeMS;
}
/**
* @internal
* This method is intended to be used in situations where concurrent operation are on the same deadline, but cannot share a single `TimeoutContext` instance.
* Returns a new instance of `CSOTTimeoutContext` constructed with identical options, but setting the `start` property to `this.start`.
*/
clone(): CSOTTimeoutContext {
const timeoutContext = new CSOTTimeoutContext({
timeoutMS: this.timeoutMS,
serverSelectionTimeoutMS: this.serverSelectionTimeoutMS
});
timeoutContext.start = this.start;
return timeoutContext;
}
override refreshed(): CSOTTimeoutContext {
return new CSOTTimeoutContext(this);
}
override addMaxTimeMSToCommand(command: Document, options: { omitMaxTimeMS?: boolean }): void {
if (options.omitMaxTimeMS) return;
const maxTimeMS = this.remainingTimeMS - this.minRoundTripTime;
if (maxTimeMS > 0 && Number.isFinite(maxTimeMS)) command.maxTimeMS = maxTimeMS;
}
override getSocketTimeoutMS(): number | undefined {
return 0;
}
}
/** @internal */
export class LegacyTimeoutContext extends TimeoutContext {
options: LegacyTimeoutContextOptions;
clearServerSelectionTimeout: boolean;
constructor(options: LegacyTimeoutContextOptions) {
super();
this.options = options;
this.clearServerSelectionTimeout = true;
}
csotEnabled(): this is CSOTTimeoutContext {
return false;
}
get serverSelectionTimeout(): Timeout | null {
if (this.options.serverSelectionTimeoutMS != null && this.options.serverSelectionTimeoutMS > 0)
return Timeout.expires(this.options.serverSelectionTimeoutMS);
return null;
}
get connectionCheckoutTimeout(): Timeout | null {
if (this.options.waitQueueTimeoutMS != null && this.options.waitQueueTimeoutMS > 0)
return Timeout.expires(this.options.waitQueueTimeoutMS);
return null;
}
get timeoutForSocketWrite(): Timeout | null {
return null;
}
get timeoutForSocketRead(): Timeout | null {
return null;
}
refresh(): void {
return;
}
clear(): void {
return;
}
get maxTimeMS() {
return null;
}
override refreshed(): LegacyTimeoutContext {
return new LegacyTimeoutContext(this.options);
}
override addMaxTimeMSToCommand(_command: Document, _options: { omitMaxTimeMS?: boolean }): void {
// No max timeMS is added to commands in legacy timeout mode.
}
override getSocketTimeoutMS(): number | undefined {
return this.options.socketTimeoutMS;
}
}
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