/// <reference types="node" />
import { BitField, ShortChannelId } from "@node-lightning/core";
import { OutPoint } from "@node-lightning/core";
import { ILogger } from "@node-lightning/logger";
import { EventEmitter } from "events";
import { IWireMessage } from "../messages/IWireMessage";
import { Peer } from "../Peer";
import { DnsPeerQuery } from "./DnsPeerQuery";
import { GossipPeer } from "./GossipPeer";
import { IGossipRelay } from "./GossipRelay";
import { IGossipStore } from "./GossipStore";
import { IGossipFilterChainClient } from "./IGossipFilterChainClient";
export declare enum SyncState {
    Unsynced = 0,
    Syncing = 1,
    Synced = 2
}
export declare interface GossipManager {
    on(event: "message", fn: (msg: IWireMessage) => void): this;
    on(event: "error", fn: (err: Error) => void): this;
    on(event: "flushed", fn: () => void): this;
    off(event: "restored", fn: (block: number) => void): this;
    off(event: "message", fn: (msg: IWireMessage) => void): this;
    off(event: "error", fn: (err: Error) => void): this;
    off(event: "flushed", fn: () => void): this;
}
/**
 * GossipManager provides is a facade for many parts of gossip. It
 * orchestrates for validating, storing, and emitting
 * routing gossip traffic obtained by peers.
 */
export declare class GossipManager extends EventEmitter {
    readonly gossipStore: IGossipStore;
    readonly pendingStore: IGossipStore;
    readonly chainClient?: IGossipFilterChainClient;
    blockHeight: number;
    started: boolean;
    syncState: SyncState;
    isSynchronizing: boolean;
    gossipRelay: IGossipRelay;
    dnsPeerQuery: DnsPeerQuery;
    readonly peers: Set<GossipPeer>;
    readonly logger: ILogger;
    constructor(logger: ILogger, gossipStore: IGossipStore, pendingStore: IGossipStore, chainClient?: IGossipFilterChainClient);
    /**
     * The number of peers managed by the PeerManager
     */
    get peerCount(): number;
    /**
     * Starts the gossip manager. This method will load information
     * from the gossip store, determine when the last information
     * was obtained, validate the existing messages (to see if any
     * channels have closed), and finally emit all messages that
     * exist in the system.
     */
    start(): Promise<void>;
    /**
     * Adds a new peer to the GossipManager and subscribes to events that will
     * allow it to iteract with other sub-systems managed by the GossipManager.
     */
    addPeer(peer: Peer): void;
    /**
     * Uses a dns seed to discover and add peers to be managed by the GossipManager.
     */
    bootstrapPeers(ls: Buffer, localFeatures: BitField<any>, localChains: Buffer[], logger: ILogger, dnsSeed: string): Promise<void>;
    /**
     * Removes the channel from storage by the gossip manager. This
     * will likely be called by a chain-monitoring service.
     */
    removeChannel(scid: ShortChannelId): Promise<void>;
    /**
     * Removes the channel from storage by the gossip manager. This will
     * likely be called by a chain-monitoring service.
     * @param outpoint
     */
    removeChannelByOutpoint(outpoint: OutPoint): Promise<void>;
    /**
     * Retrieves the valid chan_ann, chan_update, node_ann messages
     * while making sure to not send duplicate node_ann messages.
     *
     * @remarks
     * For now we are going to buffer messages into memory. We could
     * return a stream and yield messages as they are streamed from
     * the gossip_store.
     */
    allMessages(): AsyncGenerator<IWireMessage, void, unknown>;
    /**
     * Handles when a peer has been added to the manager and it is finally
     * ready and has negotiated the gossip technique.
     * @param peer
     */
    private _onPeerReady;
    /**
     * Handles when a peer closes
     * @param gossipPeer
     */
    private _onPeerClose;
    /**
     * Handles when a peer becomes readable
     * @param peer
     */
    private _onPeerReadable;
    /**
     * Handles receieved gossip messages
     * @param msg
     */
    private _onGossipMessage;
    /**
     * Handles Gossip Errors
     */
    private _onGossipError;
    /**
     * Synchronize the peer using the peer's synchronization mechanism.
     * @param peer
     */
    private _syncPeer;
    private _restoreState;
    private _validateUtxos;
}