All files / src p2p.ts

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/*
 * Copyright © 2019 Lisk Foundation
 *
 * See the LICENSE file at the top-level directory of this distribution
 * for licensing information.
 *
 * Unless otherwise agreed in a custom licensing agreement with the Lisk Foundation,
 * no part of this software, including this file, may be copied, modified,
 * propagated, or distributed except according to the terms contained in the
 * LICENSE file.
 *
 * Removal or modification of this copyright notice is prohibited.
 *
 */
import { getRandomBytes } from '@liskhq/lisk-cryptography';
import { EventEmitter } from 'events';
import * as http from 'http';
// tslint:disable-next-line no-require-imports
import { attach, SCServer, SCServerSocket } from 'socketcluster-server';
import * as url from 'url';
 
import {
	ConnectionKind,
	DEFAULT_BAN_TIME,
	DEFAULT_FALLBACK_SEED_PEER_DISCOVERY_INTERVAL,
	DEFAULT_HTTP_PATH,
	DEFAULT_MAX_INBOUND_CONNECTIONS,
	DEFAULT_MAX_OUTBOUND_CONNECTIONS,
	DEFAULT_MAX_PEER_DISCOVERY_RESPONSE_LENGTH,
	DEFAULT_MAX_PEER_INFO_SIZE,
	DEFAULT_MIN_PEER_DISCOVERY_THRESHOLD,
	DEFAULT_MIN_TRIED_PEER_COUNT,
	DEFAULT_NODE_HOST_IP,
	DEFAULT_NONCE_LENGTH_BYTES,
	DEFAULT_OUTBOUND_SHUFFLE_INTERVAL,
	DEFAULT_PEER_PROTECTION_FOR_LATENCY,
	DEFAULT_PEER_PROTECTION_FOR_LONGEVITY,
	DEFAULT_PEER_PROTECTION_FOR_NETGROUP,
	DEFAULT_PEER_PROTECTION_FOR_USEFULNESS,
	DEFAULT_POPULATOR_INTERVAL,
	DEFAULT_RANDOM_SECRET,
	DEFAULT_RATE_CALCULATION_INTERVAL,
	DEFAULT_SEND_PEER_LIMIT,
	DEFAULT_WS_MAX_MESSAGE_RATE,
	DEFAULT_WS_MAX_MESSAGE_RATE_PENALTY,
	DEFAULT_WS_MAX_PAYLOAD,
	DUPLICATE_CONNECTION,
	DUPLICATE_CONNECTION_REASON,
	FORBIDDEN_CONNECTION,
	FORBIDDEN_CONNECTION_REASON,
	INCOMPATIBLE_PEER_CODE,
	INCOMPATIBLE_PEER_INFO_CODE,
	INCOMPATIBLE_PEER_UNKNOWN_REASON,
	INVALID_CONNECTION_QUERY_CODE,
	INVALID_CONNECTION_QUERY_REASON,
	INVALID_CONNECTION_SELF_CODE,
	INVALID_CONNECTION_SELF_REASON,
	INVALID_CONNECTION_URL_CODE,
	INVALID_CONNECTION_URL_REASON,
	PeerKind,
} from './constants';
import { PeerInboundHandshakeError } from './errors';
import {
	EVENT_BAN_PEER,
	EVENT_CLOSE_INBOUND,
	EVENT_CLOSE_OUTBOUND,
	EVENT_CONNECT_ABORT_OUTBOUND,
	EVENT_CONNECT_OUTBOUND,
	EVENT_DISCOVERED_PEER,
	EVENT_FAILED_PEER_INFO_UPDATE,
	EVENT_FAILED_TO_ADD_INBOUND_PEER,
	EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT,
	EVENT_FAILED_TO_FETCH_PEER_INFO,
	EVENT_FAILED_TO_FETCH_PEERS,
	EVENT_FAILED_TO_PUSH_NODE_INFO,
	EVENT_FAILED_TO_SEND_MESSAGE,
	EVENT_INBOUND_SOCKET_ERROR,
	EVENT_MESSAGE_RECEIVED,
	EVENT_NETWORK_READY,
	EVENT_NEW_INBOUND_PEER,
	EVENT_OUTBOUND_SOCKET_ERROR,
	EVENT_REMOVE_PEER,
	EVENT_REQUEST_RECEIVED,
	EVENT_UNBAN_PEER,
	EVENT_UPDATED_PEER_INFO,
	REMOTE_EVENT_RPC_GET_NODE_INFO,
	REMOTE_EVENT_RPC_GET_PEERS_LIST,
} from './events';
import { P2PRequest } from './p2p_request';
import {
	P2PCheckPeerCompatibility,
	P2PClosePacket,
	P2PConfig,
	P2PInternalState,
	P2PMessagePacket,
	P2PNodeInfo,
	P2PPeerInfo,
	P2PPenalty,
	P2PRequestPacket,
	P2PResponsePacket,
	PeerLists,
	ProtocolPeerInfo,
} from './p2p_types';
import { PeerBook } from './peer_book';
import { PeerPool, PeerPoolConfig } from './peer_pool';
import {
	assignInternalInfo,
	constructPeerId,
	getByteSize,
	sanitizeInitialPeerInfo,
	sanitizePeerLists,
	selectPeersForConnection,
	selectPeersForRequest,
	selectPeersForSend,
	validateNodeInfo,
	validatePeerCompatibility,
	validatePeerInfo,
} from './utils';
 
interface SCServerUpdated extends SCServer {
	readonly isReady: boolean;
}
 
const BASE_10_RADIX = 10;
 
const createPeerPoolConfig = (
	config: P2PConfig,
	peerLists: PeerLists,
): PeerPoolConfig => ({
	connectTimeout: config.connectTimeout,
	ackTimeout: config.ackTimeout,
	wsMaxPayload: config.wsMaxPayload
		? config.wsMaxPayload
		: DEFAULT_WS_MAX_PAYLOAD,
	peerSelectionForSend: config.peerSelectionForSend
		? config.peerSelectionForSend
		: selectPeersForSend,
	peerSelectionForRequest: config.peerSelectionForRequest
		? config.peerSelectionForRequest
		: selectPeersForRequest,
	peerSelectionForConnection: config.peerSelectionForConnection
		? config.peerSelectionForConnection
		: selectPeersForConnection,
	sendPeerLimit:
		config.sendPeerLimit === undefined
			? DEFAULT_SEND_PEER_LIMIT
			: config.sendPeerLimit,
	peerBanTime: config.peerBanTime ? config.peerBanTime : DEFAULT_BAN_TIME,
	maxOutboundConnections:
		config.maxOutboundConnections === undefined
			? DEFAULT_MAX_OUTBOUND_CONNECTIONS
			: config.maxOutboundConnections,
	maxInboundConnections:
		config.maxInboundConnections === undefined
			? DEFAULT_MAX_INBOUND_CONNECTIONS
			: config.maxInboundConnections,
	maxPeerDiscoveryResponseLength:
		config.maxPeerDiscoveryResponseLength === undefined
			? DEFAULT_MAX_PEER_DISCOVERY_RESPONSE_LENGTH
			: config.maxPeerDiscoveryResponseLength,
	maxPeerInfoSize: config.maxPeerInfoSize
		? config.maxPeerInfoSize
		: DEFAULT_MAX_PEER_INFO_SIZE,
	outboundShuffleInterval: config.outboundShuffleInterval
		? config.outboundShuffleInterval
		: DEFAULT_OUTBOUND_SHUFFLE_INTERVAL,
	netgroupProtectionRatio:
		typeof config.netgroupProtectionRatio === 'number'
			? config.netgroupProtectionRatio
			: DEFAULT_PEER_PROTECTION_FOR_NETGROUP,
	latencyProtectionRatio:
		typeof config.latencyProtectionRatio === 'number'
			? config.latencyProtectionRatio
			: DEFAULT_PEER_PROTECTION_FOR_LATENCY,
	productivityProtectionRatio:
		typeof config.productivityProtectionRatio === 'number'
			? config.productivityProtectionRatio
			: DEFAULT_PEER_PROTECTION_FOR_USEFULNESS,
	longevityProtectionRatio:
		typeof config.longevityProtectionRatio === 'number'
			? config.longevityProtectionRatio
			: DEFAULT_PEER_PROTECTION_FOR_LONGEVITY,
	wsMaxMessageRate:
		typeof config.wsMaxMessageRate === 'number'
			? config.wsMaxMessageRate
			: DEFAULT_WS_MAX_MESSAGE_RATE,
	wsMaxMessageRatePenalty:
		typeof config.wsMaxMessageRatePenalty === 'number'
			? config.wsMaxMessageRatePenalty
			: DEFAULT_WS_MAX_MESSAGE_RATE_PENALTY,
	rateCalculationInterval:
		typeof config.rateCalculationInterval === 'number'
			? config.rateCalculationInterval
			: DEFAULT_RATE_CALCULATION_INTERVAL,
	secret: config.secret ? config.secret : DEFAULT_RANDOM_SECRET,
	peerLists,
});
 
export class P2P extends EventEmitter {
	private readonly _config: P2PConfig;
	private readonly _sanitizedPeerLists: PeerLists;
	private readonly _httpServer: http.Server;
	private _isActive: boolean;
	private _hasConnected: boolean;
	private readonly _peerBook: PeerBook;
	private readonly _bannedPeers: Set<string>;
	private readonly _populatorInterval: number;
	private _nextSeedPeerDiscovery: number;
	private readonly _fallbackSeedPeerDiscoveryInterval: number;
	private _populatorIntervalId: NodeJS.Timer | undefined;
	private _nodeInfo: P2PNodeInfo;
	private readonly _peerPool: PeerPool;
	private readonly _scServer: SCServerUpdated;
	private readonly _secret: number;
 
	private readonly _handlePeerPoolRPC: (request: P2PRequest) => void;
	private readonly _handlePeerPoolMessage: (message: P2PMessagePacket) => void;
	private readonly _handleDiscoveredPeer: (peerInfo: P2PPeerInfo) => void;
	private readonly _handleFailedToPushNodeInfo: (error: Error) => void;
	private readonly _handleFailedToSendMessage: (error: Error) => void;
	private readonly _handleOutboundPeerConnect: (peerInfo: P2PPeerInfo) => void;
	private readonly _handleOutboundPeerConnectAbort: (
		peerInfo: P2PPeerInfo,
	) => void;
	private readonly _handlePeerCloseOutbound: (
		closePacket: P2PClosePacket,
	) => void;
	private readonly _handlePeerCloseInbound: (
		closePacket: P2PClosePacket,
	) => void;
	private readonly _handleRemovePeer: (peerId: string) => void;
	private readonly _handlePeerInfoUpdate: (peerInfo: P2PPeerInfo) => void;
	private readonly _handleFailedToFetchPeerInfo: (error: Error) => void;
	private readonly _handleFailedToFetchPeers: (error: Error) => void;
	private readonly _handleFailedPeerInfoUpdate: (error: Error) => void;
	private readonly _handleFailedToCollectPeerDetails: (error: Error) => void;
	private readonly _handleBanPeer: (peerId: string) => void;
	private readonly _handleUnbanPeer: (peerId: string) => void;
	private readonly _handleOutboundSocketError: (error: Error) => void;
	private readonly _handleInboundSocketError: (error: Error) => void;
	private readonly _peerHandshakeCheck: P2PCheckPeerCompatibility;
 
	public constructor(config: P2PConfig) {
		super();
		this._secret = config.secret ? config.secret : DEFAULT_RANDOM_SECRET;
		this._sanitizedPeerLists = sanitizePeerLists(
			{
				seedPeers: config.seedPeers
					? config.seedPeers.map(sanitizeInitialPeerInfo)
					: [],
				blacklistedIPs: config.blacklistedIPs ? config.blacklistedIPs : [],
				fixedPeers: config.fixedPeers
					? config.fixedPeers.map(sanitizeInitialPeerInfo)
					: [],
				whitelisted: config.whitelistedPeers
					? config.whitelistedPeers.map(sanitizeInitialPeerInfo)
					: [],
				previousPeers: config.previousPeers
					? config.previousPeers.map(sanitizeInitialPeerInfo)
					: [],
			},
			{
				peerId: constructPeerId(
					config.hostIp || DEFAULT_NODE_HOST_IP,
					config.nodeInfo.wsPort,
				),
				ipAddress: config.hostIp || DEFAULT_NODE_HOST_IP,
				wsPort: config.nodeInfo.wsPort,
			},
			this._secret,
		);
 
		this._config = config;
		this._isActive = false;
		this._hasConnected = false;
		this._peerBook = new PeerBook({
			secret: this._secret,
		});
		this._initializePeerBook();
		this._bannedPeers = new Set();
		this._httpServer = http.createServer();
		this._scServer = attach(this._httpServer, {
			path: DEFAULT_HTTP_PATH,
			wsEngineServerOptions: {
				maxPayload: config.wsMaxPayload
					? config.wsMaxPayload
					: DEFAULT_WS_MAX_PAYLOAD,
			},
		}) as SCServerUpdated;
 
		// This needs to be an arrow function so that it can be used as a listener.
		this._handlePeerPoolRPC = (request: P2PRequest) => {
			// Process protocol messages
			switch (request.procedure) {
				case REMOTE_EVENT_RPC_GET_PEERS_LIST:
					this._handleGetPeersRequest(request);
					break;
				case REMOTE_EVENT_RPC_GET_NODE_INFO:
					this._handleGetNodeInfo(request);
					break;
				default:
			}
 
			// Re-emit the request for external use.
			this.emit(EVENT_REQUEST_RECEIVED, request);
		};
 
		// This needs to be an arrow function so that it can be used as a listener.
		this._handlePeerPoolMessage = (message: P2PMessagePacket) => {
			// Re-emit the message for external use.
			this.emit(EVENT_MESSAGE_RECEIVED, message);
		};
 
		this._handleOutboundPeerConnect = (peerInfo: P2PPeerInfo) => {
			Iif (!this._peerBook.hasPeer(peerInfo)) {
				this._peerBook.addPeer(this._assignPeerKind(peerInfo));
			}
 
			this._peerBook.upgradePeer(peerInfo);
 
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_CONNECT_OUTBOUND, peerInfo);
			if (this._isNetworkReady()) {
				this.emit(EVENT_NETWORK_READY);
			}
		};
 
		this._handleOutboundPeerConnectAbort = (peerInfo: P2PPeerInfo) => {
			if (
				this._peerBook.hasPeer(peerInfo) &&
				(peerInfo.internalState as P2PInternalState).peerKind !==
					PeerKind.WHITELISTED_PEER
			) {
				this._peerBook.downgradePeer(peerInfo);
			}
 
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_CONNECT_ABORT_OUTBOUND, peerInfo);
		};
 
		this._handlePeerCloseOutbound = (closePacket: P2PClosePacket) => {
			const { peerInfo } = closePacket;
			// Update connection kind when closing connection
			if (this._peerBook.getPeer(closePacket.peerInfo)) {
				const updatedPeer = {
					...peerInfo,
					internalState: assignInternalInfo(peerInfo, this._secret),
				};
 
				this._peerBook.updatePeer(updatedPeer);
			}
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_CLOSE_OUTBOUND, closePacket);
		};
 
		this._handlePeerCloseInbound = (closePacket: P2PClosePacket) => {
			const { peerInfo } = closePacket;
			// Update connection kind when closing connection
			Eif (this._peerBook.getPeer(closePacket.peerInfo)) {
				const updatedPeer = {
					...peerInfo,
					internalState: assignInternalInfo(peerInfo, this._secret),
				};
 
				this._peerBook.updatePeer(updatedPeer);
			}
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_CLOSE_INBOUND, closePacket);
		};
 
		this._handleRemovePeer = (peerId: string) => {
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_REMOVE_PEER, peerId);
		};
 
		this._handlePeerInfoUpdate = (peerInfo: P2PPeerInfo) => {
			if (!this._peerBook.hasPeer(peerInfo)) {
				this._peerBook.addPeer(this._assignPeerKind(peerInfo));
			}
 
			const isUpdated = this._peerBook.updatePeer(peerInfo);
			Eif (isUpdated) {
				// If found and updated successfully then upgrade the peer
				this._peerBook.upgradePeer(peerInfo);
				// Re-emit the message to allow it to bubble up the class hierarchy.
				this.emit(EVENT_UPDATED_PEER_INFO, peerInfo);
			}
		};
 
		this._handleFailedPeerInfoUpdate = (error: Error) => {
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_PEER_INFO_UPDATE, error);
		};
 
		this._handleFailedToFetchPeerInfo = (error: Error) => {
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_TO_FETCH_PEER_INFO, error);
		};
 
		this._handleFailedToFetchPeers = (error: Error) => {
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_TO_FETCH_PEERS, error);
		};
 
		this._handleFailedToCollectPeerDetails = (error: Error) => {
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT, error);
		};
 
		this._handleBanPeer = (peerId: string) => {
			this._bannedPeers.add(peerId.split(':')[0]);
			const isWhitelisted = this._sanitizedPeerLists.whitelisted.find(
				peer => peer.peerId === peerId,
			);
 
			const bannedPeerInfo = {
				ipAddress: peerId.split(':')[0],
				wsPort: +peerId.split(':')[1],
			};
 
			if (
				this._peerBook.hasPeer({
					ipAddress: bannedPeerInfo.ipAddress,
					wsPort: bannedPeerInfo.wsPort,
					peerId,
				}) &&
				!isWhitelisted
			) {
				this._peerBook.removePeer({
					ipAddress: bannedPeerInfo.ipAddress,
					wsPort: bannedPeerInfo.wsPort,
					peerId,
				});
			}
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_BAN_PEER, peerId);
		};
 
		this._handleUnbanPeer = (peerId: string) => {
			this._bannedPeers.delete(peerId.split(':')[0]);
			// Re-emit the message to allow it to bubble up the class hierarchy.
			this.emit(EVENT_UNBAN_PEER, peerId);
		};
 
		// When peer is fetched for status after connection then update the peerinfo in triedPeer list
		this._handleDiscoveredPeer = (detailedPeerInfo: P2PPeerInfo) => {
			// Check blacklist to avoid incoming connections from blacklisted ips
			const isBlacklisted = this._sanitizedPeerLists.blacklistedIPs.find(
				blacklistedIP => blacklistedIP === detailedPeerInfo.ipAddress,
			);
			if (!this._peerBook.hasPeer(detailedPeerInfo) && !isBlacklisted) {
				this._peerBook.addPeer(this._assignPeerKind(detailedPeerInfo));
				// Re-emit the message to allow it to bubble up the class hierarchy.
				// Only emit event when a peer is discovered for the first time.
				this.emit(EVENT_DISCOVERED_PEER, detailedPeerInfo);
 
				Eif (!this._peerPool.hasPeer(detailedPeerInfo.peerId)) {
					const isUpdated = this._peerBook.updatePeer(detailedPeerInfo);
					Eif (isUpdated) {
						// If found and updated successfully then upgrade the peer
						this._peerBook.upgradePeer(detailedPeerInfo);
					}
				}
			}
		};
 
		this._handleFailedToPushNodeInfo = (error: Error) => {
			// Re-emit the error to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_TO_PUSH_NODE_INFO, error);
		};
 
		this._handleFailedToSendMessage = (error: Error) => {
			// Re-emit the error to allow it to bubble up the class hierarchy.
			this.emit(EVENT_FAILED_TO_SEND_MESSAGE, error);
		};
 
		this._handleOutboundSocketError = (error: Error) => {
			// Re-emit the error to allow it to bubble up the class hierarchy.
			this.emit(EVENT_OUTBOUND_SOCKET_ERROR, error);
		};
 
		this._handleInboundSocketError = (error: Error) => {
			// Re-emit the error to allow it to bubble up the class hierarchy.
			this.emit(EVENT_INBOUND_SOCKET_ERROR, error);
		};
 
		const peerPoolConfig = createPeerPoolConfig(
			config,
			this._sanitizedPeerLists,
		);
		this._peerPool = new PeerPool(peerPoolConfig);
 
		this._bindHandlersToPeerPool(this._peerPool);
 
		this._nodeInfo = {
			...config.nodeInfo,
			nonce: getRandomBytes(DEFAULT_NONCE_LENGTH_BYTES).toString('hex'),
		};
		this.applyNodeInfo(this._nodeInfo);
 
		this._populatorInterval = config.populatorInterval
			? config.populatorInterval
			: DEFAULT_POPULATOR_INTERVAL;
 
		this._fallbackSeedPeerDiscoveryInterval = config.fallbackSeedPeerDiscoveryInterval
			? config.fallbackSeedPeerDiscoveryInterval
			: DEFAULT_FALLBACK_SEED_PEER_DISCOVERY_INTERVAL;
 
		this._nextSeedPeerDiscovery =
			Date.now() + this._fallbackSeedPeerDiscoveryInterval;
 
		this._peerHandshakeCheck = config.peerHandshakeCheck
			? config.peerHandshakeCheck
			: validatePeerCompatibility;
	}
 
	public get config(): P2PConfig {
		return this._config;
	}
 
	public get isActive(): boolean {
		return this._isActive;
	}
 
	/**
	 * This is not a declared as a setter because this method will need
	 * invoke an async RPC on Peers to give them our new node status.
	 */
	public applyNodeInfo(nodeInfo: P2PNodeInfo): void {
		validateNodeInfo(
			nodeInfo,
			this._config.maxPeerInfoSize
				? this._config.maxPeerInfoSize
				: DEFAULT_MAX_PEER_INFO_SIZE,
		);
 
		this._nodeInfo = {
			...nodeInfo,
			nonce: this.nodeInfo.nonce,
		};
 
		this._peerPool.applyNodeInfo(this._nodeInfo);
	}
 
	public get nodeInfo(): P2PNodeInfo {
		return this._nodeInfo;
	}
 
	public applyPenalty(peerPenalty: P2PPenalty): void {
		Iif (!this._isTrustedPeer(peerPenalty.peerId)) {
			this._peerPool.applyPenalty(peerPenalty);
		}
	}
 
	public getTriedPeers(): ReadonlyArray<ProtocolPeerInfo> {
		return this._peerBook.triedPeers.map(peer => ({
			...peer.sharedState,
			ipAddress: peer.ipAddress,
			wsPort: peer.wsPort,
		}));
	}
 
	// Make sure you always share shared peer state to a user
	public getConnectedPeers(): ReadonlyArray<ProtocolPeerInfo> {
		// Only share the shared state to the user
		return this._peerPool
			.getAllConnectedPeerInfos()
			.filter(
				peer => !(peer.internalState && !peer.internalState.advertiseAddress),
			)
			.map(peer => ({
				...peer.sharedState,
				ipAddress: peer.ipAddress,
				wsPort: peer.wsPort,
				peerId: peer.peerId,
			}));
	}
 
	// Make sure you always share shared peer state to a user
	public getDisconnectedPeers(): ReadonlyArray<ProtocolPeerInfo> {
		const allPeers = this._peerBook.allPeers;
		const connectedPeers = this.getConnectedPeers();
		const disconnectedPeers = allPeers.filter(peer => {
			if (
				connectedPeers.find(
					connectedPeer => peer.peerId === (connectedPeer.peerId as string),
				)
			) {
				return false;
			}
 
			return true;
		});
 
		// Only share the shared state to the user and remove private peers
		return disconnectedPeers
			.filter(
				peer => !(peer.internalState && !peer.internalState.advertiseAddress),
			)
			.map(peer => ({
				...peer.sharedState,
				ipAddress: peer.ipAddress,
				wsPort: peer.wsPort,
				peerId: peer.peerId,
			}));
	}
 
	public async request(packet: P2PRequestPacket): Promise<P2PResponsePacket> {
		const response = await this._peerPool.request(packet);
 
		return response;
	}
 
	public send(message: P2PMessagePacket): void {
		this._peerPool.send(message);
	}
 
	public broadcast(message: P2PMessagePacket): void {
		this._peerPool.broadcast(message);
	}
 
	public async requestFromPeer(
		packet: P2PRequestPacket,
		peerId: string,
	): Promise<P2PResponsePacket> {
		return this._peerPool.requestFromPeer(packet, peerId);
	}
 
	public sendToPeer(message: P2PMessagePacket, peerId: string): void {
		this._peerPool.sendToPeer(message, peerId);
	}
 
	private _disconnectSocketDueToFailedHandshake(
		socket: SCServerSocket,
		statusCode: number,
		closeReason: string,
	): void {
		socket.disconnect(statusCode, closeReason);
		this.emit(
			EVENT_FAILED_TO_ADD_INBOUND_PEER,
			new PeerInboundHandshakeError(
				closeReason,
				statusCode,
				socket.remoteAddress,
				socket.request.url,
			),
		);
	}
 
	private _assignPeerKind(peerInfo: P2PPeerInfo): P2PPeerInfo {
		Iif (
			this._sanitizedPeerLists.blacklistedIPs.find(
				blacklistedIP => blacklistedIP === peerInfo.ipAddress,
			)
		) {
			return {
				...peerInfo,
				internalState: {
					...assignInternalInfo(peerInfo, this._secret),
					peerKind: PeerKind.BLACKLISTED_PEER,
				},
			};
		}
 
		if (
			this._sanitizedPeerLists.fixedPeers.find(
				peer => peer.ipAddress === peerInfo.ipAddress,
			)
		) {
			return {
				...peerInfo,
				internalState: {
					...assignInternalInfo(peerInfo, this._secret),
					peerKind: PeerKind.FIXED_PEER,
				},
			};
		}
 
		if (
			this._sanitizedPeerLists.whitelisted.find(
				peer => peer.ipAddress === peerInfo.ipAddress,
			)
		) {
			return {
				...peerInfo,
				internalState: {
					...assignInternalInfo(peerInfo, this._secret),
					peerKind: PeerKind.WHITELISTED_PEER,
				},
			};
		}
 
		if (
			this._sanitizedPeerLists.seedPeers.find(
				peer => peer.ipAddress === peerInfo.ipAddress,
			)
		) {
			return {
				...peerInfo,
				internalState: {
					...assignInternalInfo(peerInfo, this._secret),
					peerKind: PeerKind.SEED_PEER,
				},
			};
		}
 
		return {
			...peerInfo,
			internalState: {
				...assignInternalInfo(peerInfo, this._secret),
				peerKind: PeerKind.NONE,
			},
		};
	}
 
	private async _startPeerServer(): Promise<void> {
		this._scServer.on('handshake', (socket: SCServerSocket): void => {
			// Terminate the connection the moment it receive ping frame
			(socket as any).socket.on('ping', () => {
				(socket as any).socket.terminate();
 
				return;
			});
			// Terminate the connection the moment it receive pong frame
			(socket as any).socket.on('pong', () => {
				(socket as any).socket.terminate();
 
				return;
			});
 
			Iif (this._bannedPeers.has(socket.remoteAddress)) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					FORBIDDEN_CONNECTION,
					FORBIDDEN_CONNECTION_REASON,
				);
 
				return;
			}
			// Check blacklist to avoid incoming connections from blacklisted ips
			Eif (this._sanitizedPeerLists.blacklistedIPs) {
				if (
					this._sanitizedPeerLists.blacklistedIPs.includes(socket.remoteAddress)
				) {
					this._disconnectSocketDueToFailedHandshake(
						socket,
						FORBIDDEN_CONNECTION,
						FORBIDDEN_CONNECTION_REASON,
					);
 
					return;
				}
			}
		});
 
		this._scServer.on('connection', (socket: SCServerSocket): void => {
			Iif (!socket.request.url) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INVALID_CONNECTION_URL_CODE,
					INVALID_CONNECTION_URL_REASON,
				);
 
				return;
			}
			const queryObject = url.parse(socket.request.url, true).query;
 
			if (queryObject.nonce === this._nodeInfo.nonce) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INVALID_CONNECTION_SELF_CODE,
					INVALID_CONNECTION_SELF_REASON,
				);
 
				const selfWSPort = queryObject.wsPort
					? +queryObject.wsPort
					: this._nodeInfo.wsPort;
 
				// Delete you peerinfo from both the lists
				this._peerBook.removePeer({
					peerId: constructPeerId(socket.remoteAddress, selfWSPort),
					ipAddress: socket.remoteAddress,
					wsPort: selfWSPort,
				});
 
				return;
			}
 
			Iif (
				typeof queryObject.wsPort !== 'string' ||
				typeof queryObject.version !== 'string' ||
				typeof queryObject.networkId !== 'string'
			) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INVALID_CONNECTION_QUERY_CODE,
					INVALID_CONNECTION_QUERY_REASON,
				);
 
				return;
			}
 
			const remoteWSPort: number = parseInt(queryObject.wsPort, BASE_10_RADIX);
			const peerId = constructPeerId(socket.remoteAddress, remoteWSPort);
 
			// tslint:disable-next-line no-let
			let queryOptions;
 
			try {
				queryOptions =
					typeof queryObject.options === 'string'
						? JSON.parse(queryObject.options)
						: undefined;
			} catch (error) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INVALID_CONNECTION_QUERY_CODE,
					INVALID_CONNECTION_QUERY_REASON,
				);
 
				return;
			}
 
			// Remove these wsPort and ip from the query object
			const {
				wsPort,
				ipAddress,
				advertiseAddress,
				...restOfQueryObject
			} = queryObject;
 
			const peerInPeerBook = this._peerBook.getPeer({
				peerId,
				ipAddress: socket.remoteAddress,
				wsPort: remoteWSPort,
			});
 
			const incomingPeerInfo: P2PPeerInfo = peerInPeerBook
				? {
						...peerInPeerBook,
						internalState: {
							...(peerInPeerBook.internalState
								? peerInPeerBook.internalState
								: assignInternalInfo(peerInPeerBook, this._secret)),
							advertiseAddress: advertiseAddress !== 'false',
							connectionKind: ConnectionKind.INBOUND,
						},
				  }
				: this._assignPeerKind({
						sharedState: {
							...restOfQueryObject,
							...queryOptions,
							height: queryObject.height ? +queryObject.height : 0, // TODO: Remove the usage of height for choosing among peers having same ipAddress, instead use productivity and reputation
							protocolVersion: queryObject.protocolVersion,
						},
						internalState: {
							...assignInternalInfo(
								{
									peerId,
									ipAddress: socket.remoteAddress,
									wsPort: remoteWSPort,
								},
								this._secret,
							),
							advertiseAddress: advertiseAddress !== 'false',
							connectionKind: ConnectionKind.INBOUND,
						},
						peerId,
						ipAddress: socket.remoteAddress,
						wsPort: remoteWSPort,
				  });
 
			try {
				validatePeerInfo(
					incomingPeerInfo,
					this._config.maxPeerInfoSize
						? this._config.maxPeerInfoSize
						: DEFAULT_MAX_PEER_INFO_SIZE,
				);
			} catch (error) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INCOMPATIBLE_PEER_INFO_CODE,
					error,
				);
			}
 
			const { success, error } = this._peerHandshakeCheck(
				incomingPeerInfo,
				this._nodeInfo,
			);
 
			if (!success) {
				const incompatibilityReason = error || INCOMPATIBLE_PEER_UNKNOWN_REASON;
 
				this._disconnectSocketDueToFailedHandshake(
					socket,
					INCOMPATIBLE_PEER_CODE,
					incompatibilityReason,
				);
 
				return;
			}
 
			try {
				this._peerPool.addInboundPeer(incomingPeerInfo, socket);
				this.emit(EVENT_NEW_INBOUND_PEER, incomingPeerInfo);
			} catch (err) {
				this._disconnectSocketDueToFailedHandshake(
					socket,
					DUPLICATE_CONNECTION,
					DUPLICATE_CONNECTION_REASON,
				);
 
				return;
			}
 
			if (this._peerBook.hasPeer(incomingPeerInfo)) {
				return;
			}
 
			this._peerBook.addPeer({
				...incomingPeerInfo,
				sourceAddress: socket.remoteAddress,
			});
		});
 
		this._httpServer.listen(
			this._nodeInfo.wsPort,
			this._config.hostIp || DEFAULT_NODE_HOST_IP,
		);
		Iif (this._scServer.isReady) {
			this._isActive = true;
 
			return;
		}
 
		return new Promise<void>(resolve => {
			this._scServer.once('ready', () => {
				this._isActive = true;
				resolve();
			});
		});
	}
 
	private async _stopHTTPServer(): Promise<void> {
		return new Promise<void>(resolve => {
			this._httpServer.close(() => {
				resolve();
			});
		});
	}
 
	private async _stopWSServer(): Promise<void> {
		return new Promise<void>(resolve => {
			this._scServer.close(() => {
				resolve();
			});
		});
	}
 
	private async _stopPeerServer(): Promise<void> {
		await this._stopWSServer();
		await this._stopHTTPServer();
	}
 
	private _startPopulator(): void {
		Iif (this._populatorIntervalId) {
			throw new Error('Populator is already running');
		}
		this._populatorIntervalId = setInterval(() => {
			this._peerPool.triggerNewConnections(
				this._peerBook.newPeers,
				this._peerBook.triedPeers,
			);
 
			// LIP-0004 re-discovery SeedPeers when Outboundconnection < maxOutboundconnections
			if (
				this._nextSeedPeerDiscovery < Date.now() &&
				this._peerPool.getFreeOutboundSlots() > 0
			) {
				this._peerPool.discoverFromSeedPeers();
				this._nextSeedPeerDiscovery =
					Date.now() + this._fallbackSeedPeerDiscoveryInterval;
			}
		}, this._populatorInterval);
 
		// Initial Populator
		this._peerPool.triggerNewConnections(
			this._peerBook.newPeers,
			this._peerBook.triedPeers,
		);
	}
 
	private _stopPopulator(): void {
		Eif (this._populatorIntervalId) {
			clearInterval(this._populatorIntervalId);
		}
	}
 
	private _isNetworkReady(): boolean {
		if (!this._hasConnected && this._peerPool.getConnectedPeers().length > 0) {
			this._hasConnected = true;
 
			return true;
		}
 
		return false;
	}
 
	private _handleGetPeersRequest(request: P2PRequest): void {
		const minimumPeerDiscoveryThreshold = this._config
			.minimumPeerDiscoveryThreshold
			? this._config.minimumPeerDiscoveryThreshold
			: DEFAULT_MIN_PEER_DISCOVERY_THRESHOLD;
		const maxPeerDiscoveryResponseLength = this._config
			.maxPeerDiscoveryResponseLength
			? this._config.maxPeerDiscoveryResponseLength
			: DEFAULT_MAX_PEER_DISCOVERY_RESPONSE_LENGTH;
		const wsMaxPayload = this._config.wsMaxPayload
			? this._config.wsMaxPayload
			: DEFAULT_WS_MAX_PAYLOAD;
		const maxPeerInfoSize = this._config.maxPeerInfoSize
			? this._config.maxPeerInfoSize
			: DEFAULT_MAX_PEER_INFO_SIZE;
 
		const safeMaxPeerInfoLength =
			Math.floor(DEFAULT_WS_MAX_PAYLOAD / maxPeerInfoSize) - 1;
 
		const selectedPeers = this._peerBook.getRandomizedPeerList(
			minimumPeerDiscoveryThreshold,
			maxPeerDiscoveryResponseLength,
		);
 
		// Remove internal state to check byte size
		const sanitizedPeerInfoList: ProtocolPeerInfo[] = selectedPeers
			.filter(
				peer => !(peer.internalState && !peer.internalState.advertiseAddress),
			)
			.map(peer => ({
				ipAddress: peer.ipAddress,
				wsPort: peer.wsPort,
				...peer.sharedState,
			}));
 
		request.end({
			success: true,
			peers:
				getByteSize(sanitizedPeerInfoList) < wsMaxPayload
					? sanitizedPeerInfoList
					: sanitizedPeerInfoList.slice(0, safeMaxPeerInfoLength),
		});
	}
 
	private _handleGetNodeInfo(request: P2PRequest): void {
		request.end(this._nodeInfo);
	}
 
	private _isTrustedPeer(peerId: string): boolean {
		const isSeed = this._sanitizedPeerLists.seedPeers.find(
			seedPeer => peerId === seedPeer.peerId,
		);
 
		const isWhitelisted = this._sanitizedPeerLists.whitelisted.find(
			peer => peer.peerId === peerId,
		);
 
		const isFixed = this._sanitizedPeerLists.fixedPeers.find(
			peer => peer.peerId === peerId,
		);
 
		return !!isSeed || !!isWhitelisted || !!isFixed;
	}
 
	private _initializePeerBook(): void {
		const newPeersToAdd = [
			...this._sanitizedPeerLists.fixedPeers,
			...this._sanitizedPeerLists.whitelisted,
			...this._sanitizedPeerLists.previousPeers,
		];
 
		// Add peers to tried peers if want to re-use previously tried peers
		// According to LIP, add whitelist peers to triedPeer by upgrading them initially.
		newPeersToAdd.forEach(peerInfo => {
			if (!this._peerBook.hasPeer(peerInfo)) {
				this._peerBook.addPeer(this._assignPeerKind(peerInfo));
			}
 
			this._peerBook.upgradePeer(peerInfo);
		});
	}
 
	public async start(): Promise<void> {
		if (this._isActive) {
			throw new Error('Node cannot start because it is already active.');
		}
 
		await this._startPeerServer();
 
		// We need this check this._isActive in case the P2P library is shut down while it was in the middle of starting up.
		Eif (this._isActive) {
			// Initial discovery and disconnect from SeedPeers (LIP-0004)
			Eif (this._peerBook.triedPeers.length < DEFAULT_MIN_TRIED_PEER_COUNT) {
				this._peerPool.discoverFromSeedPeers();
				this._nextSeedPeerDiscovery =
					Date.now() + this._fallbackSeedPeerDiscoveryInterval;
			}
 
			this._startPopulator();
		}
	}
 
	public async stop(): Promise<void> {
		if (!this._isActive) {
			throw new Error('Node cannot be stopped because it is not active.');
		}
		this._isActive = false;
		this._hasConnected = false;
		this._stopPopulator();
		this._peerPool.removeAllPeers();
		await this._stopPeerServer();
	}
 
	private _bindHandlersToPeerPool(peerPool: PeerPool): void {
		peerPool.on(EVENT_REQUEST_RECEIVED, this._handlePeerPoolRPC);
		peerPool.on(EVENT_MESSAGE_RECEIVED, this._handlePeerPoolMessage);
		peerPool.on(EVENT_CONNECT_OUTBOUND, this._handleOutboundPeerConnect);
		peerPool.on(
			EVENT_CONNECT_ABORT_OUTBOUND,
			this._handleOutboundPeerConnectAbort,
		);
		peerPool.on(EVENT_CLOSE_INBOUND, this._handlePeerCloseInbound);
		peerPool.on(EVENT_CLOSE_OUTBOUND, this._handlePeerCloseOutbound);
		peerPool.on(EVENT_REMOVE_PEER, this._handleRemovePeer);
		peerPool.on(EVENT_UPDATED_PEER_INFO, this._handlePeerInfoUpdate);
		peerPool.on(
			EVENT_FAILED_PEER_INFO_UPDATE,
			this._handleFailedPeerInfoUpdate,
		);
		peerPool.on(
			EVENT_FAILED_TO_FETCH_PEER_INFO,
			this._handleFailedToFetchPeerInfo,
		);
		peerPool.on(EVENT_FAILED_TO_FETCH_PEERS, this._handleFailedToFetchPeers);
		peerPool.on(
			EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT,
			this._handleFailedToCollectPeerDetails,
		);
		peerPool.on(EVENT_DISCOVERED_PEER, this._handleDiscoveredPeer);
		peerPool.on(
			EVENT_FAILED_TO_PUSH_NODE_INFO,
			this._handleFailedToPushNodeInfo,
		);
		peerPool.on(EVENT_FAILED_TO_SEND_MESSAGE, this._handleFailedToSendMessage);
		peerPool.on(EVENT_OUTBOUND_SOCKET_ERROR, this._handleOutboundSocketError);
		peerPool.on(EVENT_INBOUND_SOCKET_ERROR, this._handleInboundSocketError);
		peerPool.on(EVENT_BAN_PEER, this._handleBanPeer);
		peerPool.on(EVENT_UNBAN_PEER, this._handleUnbanPeer);
	}
	// tslint:disable-next-line:max-file-line-count
}