import tls from 'node:tls';
import { ContextAwareError } from 'cm-libs-context-aware-error';
import { Socket, TcpBase, TcpConnection } from './tcp-base';
export * from './tcp-base';
export declare enum TCP_CLIENT_PROTOCOL {
    TCP = "TCP",
    TLS = "TLS"
}
export type OnCheckServerIdentity = (hostname: string, cert: tls.PeerCertificate) => Error;
export declare abstract class TcpClient<T> extends TcpBase<T> {
    readonly hostname: string;
    readonly port: number;
    readonly connectTimeout: number;
    readonly keepAliveInterval?: number;
    readonly idleTimeout?: number;
    readonly detectEarlyClosure?: number;
    protected ref?: T;
    protected protocol: TCP_CLIENT_PROTOCOL;
    protected tlsServerName: string;
    protected tlsCert: string;
    protected tlsKey: string;
    protected tlsCa: string;
    protected tlsOnCheckServerIdentity: OnCheckServerIdentity;
    protected abstract onConnect(clientId: string, hostname: string, port: number, timeout?: number): Promise<void>;
    private tlsSession;
    protected constructor(hostname: string, port: number, connectTimeout: number, keepAliveInterval?: number, idleTimeout?: number, detectEarlyClosure?: number);
    protected initTls(cert?: string, key?: string, ca?: string, serverName?: string, onCheckServerIdentity?: OnCheckServerIdentity): void;
    protected connect(clientId: string, ref?: T): Promise<TcpConnection<T>>;
    private secureConnect;
    protected raiseConnectionError(socket: Socket, clientId: string, error: ContextAwareError | Error): Promise<void>;
}