/// <reference types="node" />
import { Event, Disposable } from 'vscode-jsonrpc';
import { ChannelRequestMessage, ChannelOpenMessage, ChannelOpenConfirmationMessage } from './messages/connectionMessages';
import { ChannelMetrics } from './metrics/channelMetrics';
import { SshRequestEventArgs } from './events/sshRequestEventArgs';
import { SshChannelClosedEventArgs } from './events/sshChannelClosedEventArgs';
import { CancellationToken } from './util/cancellation';
import { SshExtendedDataEventArgs, SshExtendedDataType } from './events/sshExtendedDataEventArgs';
/**
 * Represents a channel on an SSH session. A session may include multiple channels, which
 * are multiplexed over the connection. Each channel within a session has a unique integer ID.
 */
export declare class SshChannel implements Disposable {
    private readonly connectionService;
    readonly channelType: string;
    readonly channelId: number;
    readonly remoteChannelId: number;
    readonly openMessage: ChannelOpenMessage;
    openConfirmationMessage: ChannelOpenConfirmationMessage;
    static readonly sessionChannelType = "session";
    /**
     * Default maximum packet size. Channel data payloads larger than the max packet size will
     * be broken into chunks before sending. The actual `maxPacketSize` may be smaller (but
     * never larger) than the default if requested by the other side.
     */
    static readonly defaultMaxPacketSize: number;
    /**
     * Default maximum window size for received data. The other side will not send more data than
     * the window size until it receives an acknowledgement that some of the data was received and
     * processed by this side. A non-default `maxWindowSize` may be configured at the time of
     * opening the channel.
     */
    static readonly defaultMaxWindowSize: number;
    private remoteWindowSize;
    private maxWindowSizeValue;
    private windowSize;
    private remoteClosed;
    private localClosed;
    private sentEof;
    private exitStatus?;
    private exitSignal?;
    private exitErrorMessage?;
    private disposed;
    private openSendingWindowCompletionSource;
    private requestCompletionSources;
    private readonly sendSemaphore;
    /**
     * Gets an object that reports measurements about the channel.
     */
    readonly metrics: ChannelMetrics;
    private readonly dataReceivedEmitter;
    private readonly extendedDataReceivedEmitter;
    /**
     * Event raised when a data message is received on the channel.
     *
     * Users of a channel MUST add a `onDataReceived` event handler immediately after a
     * channel is opened/accepted, or else all session communication will be blocked.
     * (The `SshStream` class does this automatically.)
     *
     * The event handler must call `adjustWindow` when the data has been consumed,
     * to notify the remote side that it may send more data.
     */
    readonly onDataReceived: Event<Buffer>;
    readonly onExtendedDataReceived: Event<SshExtendedDataEventArgs>;
    private readonly eofEmitter;
    /**
     * Event raised when an EOF message is received on the channel.
     */
    readonly onEof: Event<void>;
    private readonly closedEmitter;
    readonly onClosed: Event<SshChannelClosedEventArgs>;
    private readonly requestEmitter;
    readonly onRequest: Event<SshRequestEventArgs<ChannelRequestMessage>>;
    get session(): import("./sshSession").SshSession;
    get isClosed(): boolean;
    /**
     * Gets the maximum window size for received data. The other side will not send more
     * data than the window size until it receives an acknowledgement that some of the data was
     * received and processed by this side.
     */
    get maxWindowSize(): number;
    /**
     * Sets the maximum window size for received data. The other side will not send more
     * data than the window size until it receives an acknowledgement that some of the data was
     * received and processed by this side.
     *
     * The default value is `defaultMaxWindowSize`. The value may be configured for a channel
     * opened by this side by setting `ChannelOpenMessage.maxWindowSize` in the message object
     * passed to `SshSession.openChannel()`, or for a channel opened by the other side by
     * assigning to this property while handling the `SshSession.onChannelOpening` event.
     * Changing the maximum window size at any other time is not valid because the other
     * side would not be aware of the change.
     */
    set maxWindowSize(value: number);
    /**
     * Gets the maximum packet size. Channel data payloads larger than the max packet size will
     * be broken into chunks before sending. The actual max packet size may be smaller (but
     * never larger) than `defaultMaxPacketSize` if requested by the other side.
     */
    readonly maxPacketSize: number;
    /**
     * Sends a channel request and waits for a response.
     *
     * Note if `wantReply` is `false`, this method returns `true` immediately after sending the
     * request, without waiting for a reply.
     *
     * @returns The authorization status of the response; if false, the other side denied the
     * request.
     * @throws `ObjectDisposedError` if the channel was closed before sending the request.
     * @throws `SshChannelError` if the channel was closed while waiting for a reply to the request.
     */
    request(request: ChannelRequestMessage, cancellation?: CancellationToken): Promise<boolean>;
    send(data: Buffer, cancellation?: CancellationToken): Promise<void>;
    sendExtendedData(dataTypeCode: SshExtendedDataType, data: Buffer, cancellation?: CancellationToken): Promise<void>;
    sendCommon(data: Buffer, extendedDataType: SshExtendedDataType | undefined, cancellation?: CancellationToken): Promise<void>;
    private sendEof;
    handleExtendedDataReceived(data: SshExtendedDataEventArgs): void;
    /**
     * Adjusts the local receiving window size by the specified amount, notifying
     * the remote side that it is free to send more data.
     *
     * This method MUST be called either immediately or eventually by the
     * `onDataReceived` event handler as incoming data is processed.
     */
    adjustWindow(messageLength: number): void;
    close(cancellation?: CancellationToken): Promise<void>;
    close(exitStatus: number, cancellation?: CancellationToken): Promise<void>;
    close(exitSignal: string, errorMessage?: string, cancellation?: CancellationToken): Promise<void>;
    private closeDefault;
    private closeWithStatus;
    private closeWithSignal;
    private raiseClosedEvent;
    dispose(): void;
    private disposeInternal;
    /**
     * Pipes one SSH channel into another, relaying all data between them.
     * @param toChannel Channel to which the current channel will be connected via the pipe.
     * @returns A promise that resolves when the channels are closed.
     */
    pipe(toChannel: SshChannel): Promise<void>;
    private cancelPendingRequests;
    toString(): string;
}
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