import { IWireMessage } from "../messages/IWireMessage";
import { WireError } from "../WireError";
import { IGossipStore } from "./GossipStore";
import { IGossipFilterChainClient } from "./IGossipFilterChainClient";
export declare class Result<V, E> {
    readonly value?: V;
    readonly error?: E;
    static err<V, E>(error: E): Result<V, E>;
    static ok<V, E>(value: V): Result<V, E>;
    constructor(value?: V, error?: E);
    get isOk(): boolean;
    get isErr(): boolean;
}
export declare type GossipFilterResult = Result<IWireMessage[], WireError>;
/**
 * GossipFilter recieves messages from peers and performs validation
 * on the messages to ensure that they are valid messages. These validation
 * follow messaging rules defined in Bolt #7 and include things like
 * signature checks, on-chain validation, and message sequencing requirements.
 * Successful message validation results in messages being written to an
 * instance of IGossipStore and returned as results
 *
 * The GossipFilter will also store pending messages, such as channel_update
 * message arriving before the channel_announcement.
 */
export declare class GossipFilter {
    readonly gossipStore: IGossipStore;
    readonly pendingStore: IGossipStore;
    readonly chainClient?: IGossipFilterChainClient;
    constructor(gossipStore: IGossipStore, pendingStore: IGossipStore, chainClient?: IGossipFilterChainClient);
    /**
     * Validates a message and writes it to the appropriate store.
     * A fully processed messages (or releated messages) will be
     * returned when a message is successfully processed.
     *
     */
    validateMessage(msg: IWireMessage): Promise<GossipFilterResult>;
    /**
     * Validate a node announcement message by checking to see if the
     * message is newer than the prior timestamp and if the message
     * has a valid signature from the corresponding node
     */
    private _validateNodeAnnouncement;
    /**
     * Validates a ChannelAnnouncementMessage by verifying the signatures
     * and validating the transaction on chain work. This message will
     */
    private _validateChannelAnnouncement;
    /**
     * Validates a channel_update message by ensuring that:
     * - the channel_announcement has already been recieved
     * - the channel_update is not old
     * - the channel_update is correctly signed by the node
     */
    private _validateChannelUpdate;
}