import { AxiosResponse } from 'axios';
import { WsEndpoint } from './ChronikClient';
/** A pair of Chronik HTTP and WebSocket endpoint urls */
interface Endpoint {
    /** URL for Chronik's HTTP interface */
    url: string;
    /** URL for Chronik's WebSocket interface */
    wsUrl: string;
}
export declare function appendWsUrls(urls: string[]): Endpoint[];
/**
 * Handles the networking to Chronik `Endpoint`s, including cycling
 * through both types of endpoints.
 */
export declare class FailoverProxy {
    private _endpointArray;
    private _workingIndex;
    constructor(urls: string | string[]);
    getEndpointArray(): Endpoint[];
    deriveEndpointIndex(loopIndex: number): number;
    setWorkingIndex(newIndex: number): void;
    post(path: string, data: Uint8Array): Promise<Uint8Array>;
    get(path: string): Promise<Uint8Array>;
    /**
     * Returns a Get or POST axios response from the Chronik indexer
     *
     * @param {string} path the path to the Chronik API endpoint
     * @param {string} requestType the flag indicating whether this is a get or post request
     * @param {string} data the optional axios request data specific to post requests
     * @returns {Uint8Array} returns the axios response data from Chronik
     * @throws {error} throws error on non-responsive server or valid error responses
     */
    _request(path: string, requestType: 'GET' | 'POST', data?: Uint8Array): Promise<Uint8Array>;
    /**
     * Calls axios for a GET or POST response
     *
     * @param {string} url the singular chronik url
     * @param {string} path the path to the Chronik API endpoint
     * @param {string} requestType the flag indicating whether this is a get or post request
     * @param {string} data the optional axios request data for post requests
     * @returns {Uint8Array} returns the axios response data from Chronik
     * @throws {error} throws error on non-responsive server or valid error responses
     */
    _callAxios(url: string, path: string, requestType: 'GET' | 'POST', data?: Uint8Array): Promise<Uint8Array<any>>;
    ensureResponseErrorThrown(response: AxiosResponse, path: string): void;
    /**
     * Check if a given websocket URL connects
     * Note: As of 20231110 there is no msg from chronik server confirming a connection to chronik
     * We would have to wait for a block or a transaction, which is impractical here
     * So, this is only testing whether or not a given URL is a live websocket or not
     * @param {string} wsUrl
     * @returns {bool}
     */
    private _websocketUrlConnects;
    connectWs(wsEndpoint: WsEndpoint): Promise<void>;
}
export {};
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