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2039x 175x 2039x 2039x 2039x 2039x 2033x 2039x 2039x 3806x 388x 3418x 9909x 3418x 131x 3287x 3287x 3287x 3287x 3283x 3287x 9251x 52472x 24447x 28025x 28025x 478x 478x 478x 12x 12x 12x 478x 3549x 6608x 6608x 28482x 482x 8190x 1576x 1576x 1007x 9021x 2021x 722x 6473x 9101x 9101x 9098x 9098x 9101x 9101x 7x 7x 7x 7x 9231x 9231x 698x 9231x 9231x 5326x 5326x 301x 301x 1412x 923x 1412x 611x 1412x 49x 186x 1116x 186x 192x 186x 98x 186x 60x 186x 186x 1101x 186x 342x 186x 797x 187x 187x 187x 10x 44x 10x 10x 187x 177x 177x 177x 177x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 5326x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x 9098x | /* * 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. * */ /** * The purpose of the PeerPool is to provide a simple interface for selecting, * interacting with and handling aggregated events from a collection of peers. */ import { EventEmitter } from 'events'; // tslint:disable-next-line no-require-imports import shuffle = require('lodash.shuffle'); import { SCServerSocket } from 'socketcluster-server'; import { ConnectionKind, DEFAULT_LOCALHOST_IP, EVICTED_PEER_CODE, INTENTIONAL_DISCONNECT_CODE, PeerKind, SEED_PEER_DISCONNECTION_REASON, } from './constants'; import { RequestFailError, SendFailError } 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_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_OUTBOUND_SOCKET_ERROR, EVENT_REMOVE_PEER, EVENT_REQUEST_RECEIVED, EVENT_UNBAN_PEER, EVENT_UPDATED_PEER_INFO, REMOTE_EVENT_POST_NODE_INFO, } from './events'; import { P2PRequest } from './p2p_request'; import { P2PClosePacket, P2PMessagePacket, P2PNodeInfo, P2PPeerInfo, P2PPeersCount, P2PPeerSelectionForConnectionFunction, P2PPeerSelectionForRequestFunction, P2PPeerSelectionForSendFunction, P2PPenalty, P2PRequestPacket, P2PResponsePacket, PeerLists, } from './p2p_types'; import { ConnectionState, InboundPeer, OutboundPeer, Peer, PeerConfig, } from './peer'; interface FilterPeersOptions { readonly category: PROTECTION_CATEGORY; readonly percentage: number; readonly protectBy: PROTECT_BY; } export enum PROTECT_BY { HIGHEST = 'highest', LOWEST = 'lowest', } // Returns an array of peers to be protected export const filterPeersByCategory = ( peers: Peer[], options: FilterPeersOptions, ): Peer[] => { // tslint:disable-next-line no-magic-numbers Iif (options.percentage > 1 || options.percentage < 0) { return peers; } const numberOfProtectedPeers = Math.ceil(peers.length * options.percentage); const sign = options.protectBy === PROTECT_BY.HIGHEST ? -1 : 1; // tslint:disable-next-line no-any return peers .sort((peerA: any, peerB: any) => peerA.internalState[options.category] > peerB.internalState[options.category] ? sign : sign * -1, ) .slice(0, numberOfProtectedPeers); }; export enum PROTECTION_CATEGORY { NET_GROUP = 'netgroup', LATENCY = 'latency', RESPONSE_RATE = 'responseRate', CONNECT_TIME = 'connectTime', } export interface PeerPoolConfig { readonly ackTimeout?: number; readonly connectTimeout?: number; readonly wsMaxPayload?: number; readonly maxPeerInfoSize: number; readonly peerSelectionForSend: P2PPeerSelectionForSendFunction; readonly peerSelectionForRequest: P2PPeerSelectionForRequestFunction; readonly peerSelectionForConnection: P2PPeerSelectionForConnectionFunction; readonly sendPeerLimit: number; readonly peerBanTime: number; readonly maxOutboundConnections: number; readonly maxInboundConnections: number; readonly maxPeerDiscoveryResponseLength: number; readonly outboundShuffleInterval: number; readonly netgroupProtectionRatio: number; readonly latencyProtectionRatio: number; readonly productivityProtectionRatio: number; readonly longevityProtectionRatio: number; readonly wsMaxMessageRate: number; readonly wsMaxMessageRatePenalty: number; readonly rateCalculationInterval: number; readonly secret: number; readonly peerLists: PeerLists; } export class PeerPool extends EventEmitter { private readonly _peerMap: Map<string, Peer>; private readonly _peerPoolConfig: PeerPoolConfig; private readonly _handlePeerRPC: (request: P2PRequest) => void; private readonly _handlePeerMessage: (message: P2PMessagePacket) => void; private readonly _handleOutboundPeerConnect: (peerInfo: P2PPeerInfo) => void; private readonly _handleDiscoverPeer: (peerInfo: P2PPeerInfo) => void; private readonly _handleOutboundPeerConnectAbort: ( peerInfo: P2PPeerInfo, ) => void; private readonly _handlePeerCloseOutbound: ( closePacket: P2PClosePacket, ) => void; private readonly _handlePeerCloseInbound: ( closePacket: P2PClosePacket, ) => void; private readonly _handlePeerOutboundSocketError: (error: Error) => void; private readonly _handlePeerInboundSocketError: (error: Error) => void; private readonly _handlePeerInfoUpdate: (peerInfo: P2PPeerInfo) => void; private readonly _handleFailedPeerInfoUpdate: (error: Error) => void; private readonly _handleFailedToFetchPeerInfo: (error: Error) => void; private readonly _handleFailedToFetchPeers: (error: Error) => void; private readonly _handleFailedToCollectPeerDetails: (error: Error) => void; private readonly _handleBanPeer: (peerId: string) => void; private readonly _handleUnbanPeer: (peerId: string) => void; private _nodeInfo: P2PNodeInfo | undefined; private readonly _maxOutboundConnections: number; private readonly _maxInboundConnections: number; private readonly _peerSelectForSend: P2PPeerSelectionForSendFunction; private readonly _peerSelectForRequest: P2PPeerSelectionForRequestFunction; private readonly _peerSelectForConnection: P2PPeerSelectionForConnectionFunction; private readonly _sendPeerLimit: number; private readonly _outboundShuffleIntervalId: NodeJS.Timer | undefined; private readonly _unbanTimers: Array<NodeJS.Timer | undefined>; private readonly _peerConfig: PeerConfig; private readonly _peerLists: PeerLists; public constructor(peerPoolConfig: PeerPoolConfig) { super(); this._peerMap = new Map(); this._peerPoolConfig = peerPoolConfig; this._peerConfig = { connectTimeout: this._peerPoolConfig.connectTimeout, ackTimeout: this._peerPoolConfig.ackTimeout, wsMaxMessageRate: this._peerPoolConfig.wsMaxMessageRate, wsMaxMessageRatePenalty: this._peerPoolConfig.wsMaxMessageRatePenalty, maxPeerDiscoveryResponseLength: this._peerPoolConfig .maxPeerDiscoveryResponseLength, rateCalculationInterval: this._peerPoolConfig.rateCalculationInterval, wsMaxPayload: this._peerPoolConfig.wsMaxPayload, maxPeerInfoSize: this._peerPoolConfig.maxPeerInfoSize, secret: this._peerPoolConfig.secret, }; this._peerLists = peerPoolConfig.peerLists; this._peerSelectForSend = peerPoolConfig.peerSelectionForSend; this._peerSelectForRequest = peerPoolConfig.peerSelectionForRequest; this._peerSelectForConnection = peerPoolConfig.peerSelectionForConnection; this._maxOutboundConnections = peerPoolConfig.maxOutboundConnections; this._maxInboundConnections = peerPoolConfig.maxInboundConnections; this._sendPeerLimit = peerPoolConfig.sendPeerLimit; this._outboundShuffleIntervalId = setInterval(() => { this._evictPeer(OutboundPeer); }, peerPoolConfig.outboundShuffleInterval); this._unbanTimers = []; // This needs to be an arrow function so that it can be used as a listener. this._handlePeerRPC = (request: P2PRequest) => { // Re-emit the request to allow it to bubble up the class hierarchy. this.emit(EVENT_REQUEST_RECEIVED, request); }; // This needs to be an arrow function so that it can be used as a listener. this._handlePeerMessage = (message: P2PMessagePacket) => { // Re-emit the message to allow it to bubble up the class hierarchy. this.emit(EVENT_MESSAGE_RECEIVED, message); }; // This needs to be an arrow function so that it can be used as a listener. this._handleDiscoverPeer = (peerInfo: P2PPeerInfo) => { // Re-emit the message to allow it to bubble up the class hierarchy. this.emit(EVENT_DISCOVERED_PEER, peerInfo); }; this._handleOutboundPeerConnect = (peerInfo: P2PPeerInfo) => { // Re-emit the message to allow it to bubble up the class hierarchy. this.emit(EVENT_CONNECT_OUTBOUND, peerInfo); }; this._handleOutboundPeerConnectAbort = (peerInfo: P2PPeerInfo) => { // 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 peerId = closePacket.peerInfo.peerId; this.removePeer( peerId, closePacket.code, `Outbound peer ${peerId} disconnected with reason: ${closePacket.reason || 'Unknown reason'}`, ); // Re-emit the message to allow it to bubble up the class hierarchy. this.emit(EVENT_CLOSE_OUTBOUND, closePacket); }; this._handlePeerCloseInbound = (closePacket: P2PClosePacket) => { const peerId = closePacket.peerInfo.peerId; this.removePeer( peerId, closePacket.code, `Inbound peer ${peerId} disconnected with reason: ${closePacket.reason || 'Unknown reason'}`, ); // Re-emit the message to allow it to bubble up the class hierarchy. this.emit(EVENT_CLOSE_INBOUND, closePacket); }; this._handlePeerOutboundSocketError = (error: Error) => { // Re-emit the error to allow it to bubble up the class hierarchy. this.emit(EVENT_OUTBOUND_SOCKET_ERROR, error); }; this._handlePeerInboundSocketError = (error: Error) => { // Re-emit the error to allow it to bubble up the class hierarchy. this.emit(EVENT_INBOUND_SOCKET_ERROR, error); }; this._handlePeerInfoUpdate = (peerInfo: P2PPeerInfo) => { // Re-emit the error to allow it to bubble up the class hierarchy. this.emit(EVENT_UPDATED_PEER_INFO, peerInfo); }; this._handleFailedPeerInfoUpdate = (error: Error) => { // Re-emit the error to allow it to bubble up the class hierarchy. this.emit(EVENT_FAILED_PEER_INFO_UPDATE, error); }; this._handleFailedToFetchPeerInfo = (error: Error) => { // Re-emit the error 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 error to allow it to bubble up the class hierarchy. this.emit(EVENT_FAILED_TO_FETCH_PEERS, error); }; this._handleFailedToCollectPeerDetails = (error: Error) => { // Re-emit the error to allow it to bubble up the class hierarchy. this.emit(EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT, error); }; this._handleBanPeer = (peerId: string) => { // Unban peer after peerBanTime const unbanTimeout = setTimeout( this._handleUnbanPeer.bind(this, peerId), this._peerPoolConfig.peerBanTime, ); this._unbanTimers.push(unbanTimeout); // Re-emit the peerId to allow it to bubble up the class hierarchy. this.emit(EVENT_BAN_PEER, peerId); }; this._handleUnbanPeer = (peerId: string) => { // Re-emit the peerId to allow it to bubble up the class hierarchy. this.emit(EVENT_UNBAN_PEER, peerId); }; } public applyNodeInfo(nodeInfo: P2PNodeInfo): void { this._nodeInfo = nodeInfo; const peerList = this.getPeers(); peerList.forEach(peer => { this._applyNodeInfoOnPeer(peer); }); } public get nodeInfo(): P2PNodeInfo | undefined { return this._nodeInfo; } public get peerConfig(): PeerConfig { return { ...this._peerConfig }; } public async request(packet: P2PRequestPacket): Promise<P2PResponsePacket> { const outboundPeerInfos = this.getAllConnectedPeerInfos(OutboundPeer); const peerInfoForRequest = outboundPeerInfos.length === 0 ? this.getAllConnectedPeerInfos() : outboundPeerInfos; // This function can be customized so we should pass as much info as possible. const selectedPeers = this._peerSelectForRequest({ peers: peerInfoForRequest, nodeInfo: this._nodeInfo, peerLimit: 1, requestPacket: packet, }); if (selectedPeers.length <= 0) { throw new RequestFailError( 'Request failed due to no peers found in peer selection', ); } const selectedPeerId = selectedPeers[0].peerId; return this.requestFromPeer(packet, selectedPeerId); } public broadcast(message: P2PMessagePacket): void { [...this._peerMap.values()].forEach(peer => { const selectedPeerId = peer.peerInfo.peerId; try { this.sendToPeer(message, selectedPeerId); } catch (error) { this.emit(EVENT_FAILED_TO_SEND_MESSAGE, error); } }); } public send(message: P2PMessagePacket): void { const listOfPeerInfo: ReadonlyArray<P2PPeerInfo> = [ ...this._peerMap.values(), ].map(peer => ({ ...peer.peerInfo, internalState: { ...peer.peerInfo.internalState, advertiseAddress: peer.peerInfo.internalState ? peer.peerInfo.internalState.advertiseAddress : true, connectionKind: peer instanceof OutboundPeer ? ConnectionKind.OUTBOUND : ConnectionKind.INBOUND, }, })); // This function can be customized so we should pass as much info as possible. const selectedPeers = this._peerSelectForSend({ peers: listOfPeerInfo, nodeInfo: this._nodeInfo, peerLimit: this._sendPeerLimit, messagePacket: message, }); selectedPeers.forEach((peerInfo: P2PPeerInfo) => { const selectedPeerId = peerInfo.peerId; try { this.sendToPeer(message, selectedPeerId); } catch (error) { this.emit(EVENT_FAILED_TO_SEND_MESSAGE, error); } }); } public async requestFromPeer( packet: P2PRequestPacket, peerId: string, ): Promise<P2PResponsePacket> { const peer = this._peerMap.get(peerId); if (!peer) { throw new RequestFailError( `Request failed because a peer with id ${peerId} could not be found`, ); } return peer.request(packet); } public sendToPeer(message: P2PMessagePacket, peerId: string): void { const peer = this._peerMap.get(peerId); if (!peer) { throw new SendFailError( `Send failed because a peer with id ${peerId} could not be found`, ); } peer.send(message); } public discoverFromSeedPeers(): void { const freeOutboundSlots = this.getFreeOutboundSlots(); // LIP-0004 re-discovery SeedPeers when Outboundconnection < maxOutboundconnections if (freeOutboundSlots === 0 || this._peerLists.seedPeers.length === 0) { return; } // Looking after existing seed peer connection(s) this._peerLists.seedPeers.forEach(peer => { const isConnectedSeedPeer = this.getPeer(peer.peerId); if (isConnectedSeedPeer) { // tslint:disable-next-line: no-floating-promises (async () => { try { await isConnectedSeedPeer.discoverPeers(); // tslint:disable-next-line: no-empty } catch (error) {} })(); } }); const seedPeersForDiscovery = shuffle( this._peerLists.seedPeers.slice(0, freeOutboundSlots), ); // Add new seed peer connection(s) seedPeersForDiscovery.forEach(peer => { this._addOutboundPeer(peer, this._nodeInfo as P2PNodeInfo); }); } public triggerNewConnections( newPeers: ReadonlyArray<P2PPeerInfo>, triedPeers: ReadonlyArray<P2PPeerInfo>, ): void { // Try to connect to disconnected peers without including the fixed ones which are specially treated thereafter const disconnectedNewPeers = newPeers.filter( newPeer => !this._peerMap.has(newPeer.peerId), ); const disconnectedTriedPeers = triedPeers.filter( triedPeer => !this._peerMap.has(triedPeer.peerId), ); const disconnectedFixedPeers = this._peerLists.fixedPeers.filter( peer => !this._peerMap.has(peer.peerId), ); // Trigger new connections only if the maximum of outbound connections has not been reached // If the node is not yet connected to any of the fixed peers, enough slots should be saved for them const peerLimit = this.getFreeOutboundSlots(); if (peerLimit === 0) { this._disconnectFromSeedPeers(); } // This function can be customized so we should pass as much info as possible. const peersToConnect = this._peerSelectForConnection({ newPeers: disconnectedNewPeers, triedPeers: disconnectedTriedPeers, nodeInfo: this._nodeInfo, peerLimit, }); [ ...peersToConnect, ...disconnectedFixedPeers, ].forEach((peerInfo: P2PPeerInfo) => this._addOutboundPeer(peerInfo, this._nodeInfo as P2PNodeInfo), ); } public addInboundPeer(peerInfo: P2PPeerInfo, socket: SCServerSocket): Peer { // Throw an error because adding a peer multiple times is a common developer error which is very difficult to identify and debug. if (this._peerMap.has(peerInfo.peerId)) { throw new Error(`Peer ${peerInfo.peerId} was already in the peer pool`); } const inboundPeers = this.getPeers(InboundPeer); if (inboundPeers.length >= this._maxInboundConnections) { this._evictPeer(InboundPeer); } const peer = new InboundPeer(peerInfo, socket, { ...this._peerConfig, serverNodeInfo: this._nodeInfo, }); this._peerMap.set(peer.id, peer); this._bindHandlersToPeer(peer); if (this._nodeInfo) { this._applyNodeInfoOnPeer(peer); } peer.connect(); return peer; } private _addOutboundPeer( peerInfo: P2PPeerInfo, nodeInfo: P2PNodeInfo, ): boolean { if (this.hasPeer(peerInfo.peerId)) { return false; } // Check if we got already Outbound connection into the IP address of the Peer const outboundConnectedPeer = this.getPeers(OutboundPeer).find( p => p.ipAddress === peerInfo.ipAddress && p.ipAddress !== DEFAULT_LOCALHOST_IP, ); if (outboundConnectedPeer) { return false; } /* Inject our nodeInfo for validation during handshake on outbound peer connection */ const peer = new OutboundPeer(peerInfo, { ...this._peerConfig, serverNodeInfo: nodeInfo, }); this._peerMap.set(peer.id, peer); this._bindHandlersToPeer(peer); if (this._nodeInfo) { this._applyNodeInfoOnPeer(peer); } return true; } public getPeersCountPerKind(): P2PPeersCount { return [...this._peerMap.values()].reduce( (prev, peer) => { if (peer instanceof OutboundPeer) { return { outboundCount: prev.outboundCount + 1, inboundCount: prev.inboundCount, }; } Eif (peer instanceof InboundPeer) { return { outboundCount: prev.outboundCount, inboundCount: prev.inboundCount + 1, }; } throw new Error('A non-identified peer exists in the pool.'); }, { outboundCount: 0, inboundCount: 0 }, ); } public removeAllPeers(): void { // Clear periodic eviction of outbound peers for shuffling Eif (this._outboundShuffleIntervalId) { clearInterval(this._outboundShuffleIntervalId); } // Clear unban timeouts if (this._unbanTimers.length > 0) { this._unbanTimers.forEach(timer => { Eif (timer) { clearTimeout(timer); } }); } this._peerMap.forEach((peer: Peer) => { this.removePeer( peer.id, INTENTIONAL_DISCONNECT_CODE, `Intentionally removed peer ${peer.id}`, ); }); } public getPeers( kind?: typeof OutboundPeer | typeof InboundPeer, ): ReadonlyArray<Peer> { const peers = [...this._peerMap.values()]; if (kind) { return peers.filter(peer => peer instanceof kind); } return peers; } public getAllConnectedPeerInfos( kind?: typeof OutboundPeer | typeof InboundPeer, ): ReadonlyArray<P2PPeerInfo> { return this.getConnectedPeers(kind).map(peer => peer.peerInfo); } public getConnectedPeers( kind?: typeof OutboundPeer | typeof InboundPeer, ): ReadonlyArray<Peer> { const peers = [...this._peerMap.values()]; if (kind) { return peers.filter( peer => peer instanceof kind && peer.state === ConnectionState.OPEN, ); } return peers.filter(peer => peer.state === ConnectionState.OPEN); } public getPeer(peerId: string): Peer | undefined { return this._peerMap.get(peerId); } public hasPeer(peerId: string): boolean { return this._peerMap.has(peerId); } public removePeer(peerId: string, code: number, reason: string): boolean { const peer = this._peerMap.get(peerId); if (peer) { peer.disconnect(code, reason); this._unbindHandlersFromPeer(peer); } this.emit(EVENT_REMOVE_PEER, peerId); return this._peerMap.delete(peerId); } public applyPenalty(peerPenalty: P2PPenalty): void { const peer = this._peerMap.get(peerPenalty.peerId); Eif (peer) { peer.applyPenalty(peerPenalty.penalty); return; } throw new Error(`Peer not found: ${peerPenalty.peerId}`); } public getFreeOutboundSlots(): number { const { outboundCount } = this.getPeersCountPerKind(); const disconnectedFixedPeers = this._peerLists.fixedPeers.filter( peer => !this._peerMap.has(peer.peerId), ); // If the node is not yet connected to any of the fixed peers, enough slots should be saved for them const openOutboundSlots = this._maxOutboundConnections - disconnectedFixedPeers.length - outboundCount; return openOutboundSlots; } private _applyNodeInfoOnPeer(peer: Peer): void { try { peer.send({ event: REMOTE_EVENT_POST_NODE_INFO, data: this._nodeInfo, }); } catch (error) { this.emit(EVENT_FAILED_TO_PUSH_NODE_INFO, error); } } private _disconnectFromSeedPeers(): void { const outboundPeers = this.getPeers(OutboundPeer); outboundPeers.forEach((outboundPeer: Peer) => { const isFixedPeer = this._peerLists.fixedPeers.find( (peer: P2PPeerInfo) => peer.peerId === outboundPeer.id, ); const isSeedPeer = this._peerLists.seedPeers.find( (peer: P2PPeerInfo) => peer.peerId === outboundPeer.id, ); // From FixedPeers we should not disconnect if (isSeedPeer && !isFixedPeer) { this.removePeer( outboundPeer.id, INTENTIONAL_DISCONNECT_CODE, SEED_PEER_DISCONNECTION_REASON, ); } }); } private _selectPeersForEviction(): Peer[] { const peers = [...this.getPeers(InboundPeer)].filter( peer => !( peer.internalState.peerKind === PeerKind.WHITELISTED_PEER || peer.internalState.peerKind === PeerKind.FIXED_PEER ), ); // Cannot predict which netgroups will be protected const protectedPeersByNetgroup = this._peerPoolConfig .netgroupProtectionRatio ? filterPeersByCategory(peers, { category: PROTECTION_CATEGORY.NET_GROUP, percentage: this._peerPoolConfig.netgroupProtectionRatio, protectBy: PROTECT_BY.HIGHEST, }).map(peer => peer.id) : []; // Cannot manipulate without physically moving nodes closer to the target. const protectedPeersByLatency = this._peerPoolConfig.latencyProtectionRatio ? filterPeersByCategory(peers, { category: PROTECTION_CATEGORY.LATENCY, percentage: this._peerPoolConfig.latencyProtectionRatio, protectBy: PROTECT_BY.LOWEST, }).map(peer => peer.id) : []; // Cannot manipulate this metric without performing useful work. const protectedPeersByResponseRate = this._peerPoolConfig .productivityProtectionRatio ? filterPeersByCategory(peers, { category: PROTECTION_CATEGORY.RESPONSE_RATE, percentage: this._peerPoolConfig.productivityProtectionRatio, protectBy: PROTECT_BY.HIGHEST, }).map(peer => peer.id) : []; const uniqueProtectedPeers = new Set([ ...protectedPeersByNetgroup, ...protectedPeersByLatency, ...protectedPeersByResponseRate, ]); const unprotectedPeers = peers.filter( peer => !uniqueProtectedPeers.has(peer.id), ); // Protect *the remaining half* of peers by longevity, precludes attacks that start later. const protectedPeersByConnectTime = this._peerPoolConfig .longevityProtectionRatio ? new Set([ ...filterPeersByCategory(unprotectedPeers, { category: PROTECTION_CATEGORY.CONNECT_TIME, percentage: this._peerPoolConfig.longevityProtectionRatio, protectBy: PROTECT_BY.LOWEST, }).map(peer => peer.id), ]) : new Set(); return unprotectedPeers.filter( peer => !protectedPeersByConnectTime.has(peer.id), ); } private _evictPeer(kind: typeof InboundPeer | typeof OutboundPeer): void { const peers = this.getPeers(kind); Iif (peers.length < 1) { return; } // tslint:disable-next-line strict-comparisons if (kind === OutboundPeer) { const selectedPeer = shuffle( peers.filter( peer => peer.internalState.peerKind !== PeerKind.FIXED_PEER, ), )[0]; Eif (selectedPeer) { this.removePeer( selectedPeer.id, EVICTED_PEER_CODE, `Evicted outbound peer ${selectedPeer.id}`, ); } } // tslint:disable-next-line strict-comparisons if (kind === InboundPeer) { const evictionCandidates = this._selectPeersForEviction(); const peerToEvict = shuffle(evictionCandidates)[0]; Eif (peerToEvict) { this.removePeer( peerToEvict.id, EVICTED_PEER_CODE, `Evicted inbound peer ${peerToEvict.id}`, ); } } } private _bindHandlersToPeer(peer: Peer): void { peer.on(EVENT_REQUEST_RECEIVED, this._handlePeerRPC); peer.on(EVENT_MESSAGE_RECEIVED, this._handlePeerMessage); peer.on(EVENT_CONNECT_OUTBOUND, this._handleOutboundPeerConnect); peer.on(EVENT_CONNECT_ABORT_OUTBOUND, this._handleOutboundPeerConnectAbort); peer.on(EVENT_CLOSE_OUTBOUND, this._handlePeerCloseOutbound); peer.on(EVENT_CLOSE_INBOUND, this._handlePeerCloseInbound); peer.on(EVENT_OUTBOUND_SOCKET_ERROR, this._handlePeerOutboundSocketError); peer.on(EVENT_INBOUND_SOCKET_ERROR, this._handlePeerInboundSocketError); peer.on(EVENT_UPDATED_PEER_INFO, this._handlePeerInfoUpdate); peer.on(EVENT_FAILED_PEER_INFO_UPDATE, this._handleFailedPeerInfoUpdate); peer.on(EVENT_FAILED_TO_FETCH_PEER_INFO, this._handleFailedToFetchPeerInfo); peer.on(EVENT_FAILED_TO_FETCH_PEERS, this._handleFailedToFetchPeers); peer.on( EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT, this._handleFailedToCollectPeerDetails, ); peer.on(EVENT_BAN_PEER, this._handleBanPeer); peer.on(EVENT_UNBAN_PEER, this._handleUnbanPeer); peer.on(EVENT_DISCOVERED_PEER, this._handleDiscoverPeer); } private _unbindHandlersFromPeer(peer: Peer): void { peer.removeListener(EVENT_REQUEST_RECEIVED, this._handlePeerRPC); peer.removeListener(EVENT_MESSAGE_RECEIVED, this._handlePeerMessage); peer.removeListener( EVENT_CONNECT_OUTBOUND, this._handleOutboundPeerConnect, ); peer.removeListener( EVENT_CONNECT_ABORT_OUTBOUND, this._handleOutboundPeerConnectAbort, ); peer.removeListener(EVENT_CLOSE_OUTBOUND, this._handlePeerCloseOutbound); peer.removeListener(EVENT_CLOSE_INBOUND, this._handlePeerCloseInbound); peer.removeListener(EVENT_UPDATED_PEER_INFO, this._handlePeerInfoUpdate); peer.removeListener( EVENT_FAILED_TO_FETCH_PEER_INFO, this._handleFailedToFetchPeerInfo, ); peer.removeListener( EVENT_FAILED_TO_FETCH_PEERS, this._handleFailedToFetchPeers, ); peer.removeListener( EVENT_FAILED_PEER_INFO_UPDATE, this._handleFailedPeerInfoUpdate, ); peer.removeListener( EVENT_FAILED_TO_COLLECT_PEER_DETAILS_ON_CONNECT, this._handleFailedToCollectPeerDetails, ); peer.removeListener(EVENT_BAN_PEER, this._handleBanPeer); peer.removeListener(EVENT_UNBAN_PEER, this._handleUnbanPeer); peer.removeListener(EVENT_DISCOVERED_PEER, this._handleDiscoverPeer); } } |