kucoin-api/dist/mjs/lib/BaseWSClient.d.ts

Complete & robust Node.js SDK for Kucoin's REST APIs and WebSockets, with TypeScript & strong end to end tests.

/// <reference types="node" />
import EventEmitter from 'events';
import WebSocket from 'isomorphic-ws';
import { WebsocketClientOptions, WSClientConfigurableOptions } from '../types/websockets/client.js';
import { WsOperation } from '../types/websockets/requests.js';
import { DefaultLogger } from './websocket/logger.js';
import { MessageEventLike, WsTopicRequest, WsTopicRequestOrStringTopic } from './websocket/websocket-util.js';
import { WsStore } from './websocket/WsStore.js';
import { WSConnectedResult } from './websocket/WsStore.types.js';
interface WSClientEventMap<WsKey extends string> {
    /** Connection opened. If this connection was previously opened and reconnected, expect the reconnected event instead */
    open: (evt: {
        wsKey: WsKey;
        event: any;
    }) => void;
    /** Reconnecting a dropped connection */
    reconnect: (evt: {
        wsKey: WsKey;
        event: any;
    }) => void;
    /** Successfully reconnected a connection that dropped */
    reconnected: (evt: {
        wsKey: WsKey;
        event: any;
    }) => void;
    /** Connection closed */
    close: (evt: {
        wsKey: WsKey;
        event: any;
    }) => void;
    /** Received reply to websocket command (e.g. after subscribing to topics) */
    response: (response: any & {
        wsKey: WsKey;
    }) => void;
    /** Received data for topic */
    update: (response: any & {
        wsKey: WsKey;
    }) => void;
    /** Exception from ws client OR custom listeners (e.g. if you throw inside your event handler) */
    exception: (response: any & {
        wsKey: WsKey;
    }) => void;
    error: (response: any & {
        wsKey: WsKey;
    }) => void;
    /** Confirmation that a connection successfully authenticated */
    authenticated: (event: {
        wsKey: WsKey;
        event: any;
    }) => void;
}
export interface EmittableEvent<TEvent = any> {
    eventType: 'response' | 'update' | 'exception' | 'authenticated' | 'connectionReady';
    event: TEvent;
}
export interface BaseWebsocketClient<TWSKey extends string> {
    on<U extends keyof WSClientEventMap<TWSKey>>(event: U, listener: WSClientEventMap<TWSKey>[U]): this;
    emit<U extends keyof WSClientEventMap<TWSKey>>(event: U, ...args: Parameters<WSClientEventMap<TWSKey>[U]>): boolean;
}
type WSTopic = string;
export declare abstract class BaseWebsocketClient<TWSKey extends string> extends EventEmitter {
    private wsStore;
    protected logger: typeof DefaultLogger;
    protected options: WebsocketClientOptions;
    private wsApiRequestId;
    constructor(options?: WSClientConfigurableOptions, logger?: typeof DefaultLogger);
    protected abstract sendPingEvent(wsKey: TWSKey, ws: WebSocket): void;
    protected abstract sendPongEvent(wsKey: TWSKey, ws: WebSocket): void;
    protected abstract isWsPong(data: any): boolean;
    protected abstract isWsPing(data: any): boolean;
    protected abstract getWsAuthRequestEvent(wsKey: TWSKey): Promise<object>;
    protected abstract isPrivateTopicRequest(request: WsTopicRequest<WSTopic>, wsKey: TWSKey): boolean;
    /**
     * Returns a list of string events that can be individually sent upstream to complete subscribing/unsubscribing/etc to these topics
     */
    protected abstract getWsOperationEventsForTopics(topics: WsTopicRequest<WSTopic>[], wsKey: TWSKey, operation: WsOperation): Promise<string[]>;
    protected abstract getPrivateWSKeys(): TWSKey[];
    protected abstract getWsUrl(wsKey: TWSKey): Promise<string>;
    protected abstract getMaxTopicsPerSubscribeEvent(wsKey: TWSKey): number | null;
    /**
     * Abstraction called to sort ws events into emittable event types (response to a request, data update, etc)
     */
    protected abstract resolveEmittableEvents(wsKey: TWSKey, event: MessageEventLike): EmittableEvent[];
    /**
     * Request connection of all dependent (public & private) websockets, instead of waiting for automatic connection by library
     */
    protected abstract connectAll(): Promise<(WSConnectedResult | undefined)[]>;
    protected isPrivateWsKey(wsKey: TWSKey): boolean;
    /** Returns auto-incrementing request ID, used to track promise references for async requests */
    protected getNewRequestId(): string;
    protected abstract sendWSAPIRequest(wsKey: TWSKey, channel: WSTopic, params?: any): Promise<unknown>;
    protected abstract sendWSAPIRequest(wsKey: TWSKey, channel: WSTopic, params: any): Promise<unknown>;
    /**
     * Subscribe to one or more topics on a WS connection (identified by WS Key).
     *
     * - Topics are automatically cached
     * - Connections are automatically opened, if not yet connected
     * - Authentication is automatically handled
     * - Topics are automatically resubscribed to, if something happens to the connection, unless you call unsubsribeTopicsForWsKey(topics, key).
     *
     * @param wsTopicRequests array of topics to subscribe to
     * @param wsKey ws key referring to the ws connection these topics should be subscribed on
     */
    subscribeTopicsForWsKey(wsTopicRequests: WsTopicRequestOrStringTopic<WSTopic>[], wsKey: TWSKey): false | Promise<WSConnectedResult | undefined> | undefined;
    protected unsubscribeTopicsForWsKey(wsTopicRequests: WsTopicRequestOrStringTopic<string>[], wsKey: TWSKey): void;
    /**
     * Splits topic requests into two groups, public & private topic requests
     */
    private sortTopicRequestsIntoPublicPrivate;
    /** Get the WsStore that tracks websockets & topics */
    getWsStore(): WsStore<TWSKey, WsTopicRequest<string>>;
    close(wsKey: TWSKey, force?: boolean): void;
    closeAll(force?: boolean): void;
    isConnected(wsKey: TWSKey): boolean;
    /**
     * Request connection to a specific websocket, instead of waiting for automatic connection.
     */
    connect(wsKey: TWSKey): Promise<WSConnectedResult | undefined>;
    private connectToWsUrl;
    private parseWsError;
    /** Get a signature, build the auth request and send it */
    private sendAuthRequest;
    private reconnectWithDelay;
    private ping;
    private clearTimers;
    private clearPingTimer;
    private clearPongTimer;
    /**
     * Simply builds and sends subscribe events for a list of topics for a ws key
     *
     * @private Use the `subscribe(topics)` or `subscribeTopicsForWsKey(topics, wsKey)` method to subscribe to topics. Send WS message to subscribe to topics.
     */
    private requestSubscribeTopics;
    /**
     * Simply builds and sends unsubscribe events for a list of topics for a ws key
     *
     * @private Use the `unsubscribe(topics)` method to unsubscribe from topics. Send WS message to unsubscribe from topics.
     */
    private requestUnsubscribeTopics;
    /**
     * Try sending a string event on a WS connection (identified by the WS Key)
     */
    tryWsSend(wsKey: TWSKey, wsMessage: string): void;
    private onWsOpen;
    /**
     * Called automatically once a connection is ready.
     * - Some exchanges are ready immediately after the connections open.
     * - Some exchanges send an event to confirm the connection is ready for us.
     *
     * This method is called to act when the connection is ready. Use `requireConnectionReadyConfirmation` to control how this is called.
     */
    private onWsReadyForEvents;
    /**
     * Handle subscription to private topics _after_ authentication successfully completes asynchronously.
     *
     * Only used for exchanges that require auth before sending private topic subscription requests
     */
    private onWsAuthenticated;
    private onWsMessage;
    private onWsClose;
    private getWs;
    private setWsState;
    /**
     * Promise-driven method to assert that a ws has successfully connected (will await until connection is open)
     */
    protected assertIsConnected(wsKey: TWSKey): Promise<unknown>;
}
export {};