/// <reference path="../../../third_party/typings/browser.d.ts" />
import messages = require('./messages');
import net = require('../net/net.types');
/**
 * Handles relay sockets for the TURN server frontend.
 */
export declare class Backend {
    /**
     * All clients currently known to the server, indexed by tag.
     * Note that this map is essentially the (extremely inaccurately) named
     * "5-tuple" introduced in section 2.2 of the TURN RFC:
     *   http://tools.ietf.org/html/rfc5766#section-2.2
     */
    private allocations_;
    /** Invoked when a message must be sent to the frontend. */
    private ipcHandler_;
    handleIpc: (stunMessage: messages.StunMessage, clientEndpoint: net.Endpoint) => Promise<void>;
    /** Promises to allocate a socket, wrapped in an Allocation. */
    private makeAllocation_;
    /** Sets the function to call to send a message to the frontend. */
    setIpcHandler: (ipcHandler: (stunMessage: messages.StunMessage, clientEndpoint: net.Endpoint) => void) => void;
    /**
     * Copies a Uint8Array into a new ArrayBuffer. Useful when the array
     * has been constructed from a subarray of the buffer, in which case
     * bytes.buffer is a much larger array than you are expecting.
     * TODO: be smarter about using slice in these instances
     */
    private static bytesToArrayBuffer_;
    private static getRandomTransactionId_;
}