All files / src/peer_book base_list.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 { ExistingPeerError } from '../errors';
import { P2PEnhancedPeerInfo, P2PPeerInfo } from '../p2p_types';
import {
	evictPeerRandomlyFromBucket,
	getBucketId,
	PEER_TYPE,
	sanitizeEnhancedPeerInfo,
} from '../utils';
 
export interface PeerListConfig {
	readonly numOfBuckets: number;
	readonly bucketSize: number;
	readonly secret: number;
	readonly peerType: PEER_TYPE;
}
 
export type Bucket = Map<string, P2PEnhancedPeerInfo>;
 
export interface BucketInfo {
	readonly bucketId: number;
	readonly bucket: Bucket;
}
 
export class BaseList {
	protected bucketIdToBucket: Map<number, Bucket>;
	/* 
		Auxillary map for direct peerId => peerInfo lookups
		Required because peerLists may be provided by discrete sources
	*/
	protected peerIdToPeerInfo: Map<string, P2PEnhancedPeerInfo>;
	protected type: PEER_TYPE | undefined;
	protected readonly peerListConfig: PeerListConfig;
 
	public constructor({
		bucketSize,
		numOfBuckets,
		secret,
		peerType,
	}: PeerListConfig) {
		this.peerListConfig = {
			bucketSize,
			numOfBuckets,
			peerType,
			secret,
		};
		this.bucketIdToBucket = new Map();
		this._initBuckets();
		this.peerIdToPeerInfo = new Map();
	}
 
	public get peerList(): ReadonlyArray<P2PPeerInfo> {
		const peerListMap: P2PPeerInfo[] = [];
 
		for (const peerList of [...this.bucketIdToBucket.values()]) {
			for (const peer of [...peerList.values()]) {
				// Remove internal fields before sharing
				peerListMap.push(sanitizeEnhancedPeerInfo(peer));
			}
		}
 
		return peerListMap;
	}
 
	public hasPeer(incomingPeerId: string): boolean {
		return this.peerIdToPeerInfo.has(incomingPeerId);
	}
 
	public addPeer(
		incomingPeerInfo: P2PEnhancedPeerInfo,
	): P2PEnhancedPeerInfo | undefined {
		if (this.hasPeer(incomingPeerInfo.peerId)) {
			throw new ExistingPeerError(incomingPeerInfo);
		}
 
		const { bucketId, bucket } = this.calculateBucket(
			incomingPeerInfo.ipAddress,
			this.type === PEER_TYPE.NEW_PEER
				? incomingPeerInfo.sourceAddress
				: undefined,
		);
 
		// If bucket is full, evict a peer to make space for incoming peer
		const evictedPeer =
			bucket.size >= this.peerListConfig.bucketSize
				? this.makeSpace(bucket)
				: undefined;
 
		const internalPeerInfo = {
			...incomingPeerInfo,
			numOfConnectionFailures: 0,
			dateAdded: new Date(),
			bucketId,
		};
		bucket.set(incomingPeerInfo.peerId, internalPeerInfo);
		this.peerIdToPeerInfo.set(incomingPeerInfo.peerId, internalPeerInfo);
 
		return evictedPeer;
	}
 
	public getPeer(incomingPeerId: string): P2PPeerInfo | undefined {
		const peerInfo = this.peerIdToPeerInfo.get(incomingPeerId);
 
		if (!peerInfo) {
			return undefined;
		}
 
		return sanitizeEnhancedPeerInfo(peerInfo);
	}
 
	public updatePeer(incomingPeerInfo: P2PEnhancedPeerInfo): boolean {
		const bucket = this.getBucket(incomingPeerInfo.peerId);
 
		if (!bucket) {
			return false;
		}
 
		const updatedInternalPeerInfo = {
			...bucket.get(incomingPeerInfo.peerId),
			...incomingPeerInfo,
		};
 
		bucket.set(incomingPeerInfo.peerId, updatedInternalPeerInfo);
		this.peerIdToPeerInfo.set(incomingPeerInfo.peerId, updatedInternalPeerInfo);
 
		return true;
	}
 
	public removePeer(incomingPeerInfo: P2PPeerInfo): boolean {
		const bucket = this.getBucket(incomingPeerInfo.peerId);
 
		if (bucket?.has(incomingPeerInfo.peerId)) {
			const removedFromBucket = bucket.delete(incomingPeerInfo.peerId);
			const removedFromPeerLookup = this.peerIdToPeerInfo.delete(
				incomingPeerInfo.peerId,
			);
 
			return removedFromBucket && removedFromPeerLookup;
		}
 
		return false;
	}
 
	// tslint:disable-next-line prefer-function-over-method
	public makeSpace(bucket: Bucket): P2PEnhancedPeerInfo | undefined {
		return evictPeerRandomlyFromBucket(bucket);
	}
 
	// This action is called when a peer is disconnected
	public failedConnectionAction(incomingPeerInfo: P2PPeerInfo): boolean {
		return this.removePeer(incomingPeerInfo);
	}
 
	public calculateBucket(
		targetAddress: string,
		sourceAddress?: string,
	): BucketInfo {
		const bucketId = getBucketId({
			secret: this.peerListConfig.secret,
			peerType: this.peerListConfig.peerType,
			targetAddress,
			sourceAddress:
				this.type === PEER_TYPE.NEW_PEER ? sourceAddress : undefined,
			bucketCount: this.peerListConfig.numOfBuckets,
		});
 
		return { bucketId, bucket: this.bucketIdToBucket.get(bucketId) as Bucket };
	}
 
	protected getBucket(peerId: string): Bucket | undefined {
		const internalPeerInfo = this.peerIdToPeerInfo.get(peerId);
 
		if (typeof internalPeerInfo?.bucketId !== 'number') {
			return undefined;
		}
 
		const bucket = this.bucketIdToBucket.get(internalPeerInfo.bucketId);
 
		Iif (!bucket) {
			return undefined;
		}
 
		return bucket;
	}
 
	private _initBuckets(): void {
		// Init the Map with all the buckets
		for (const bucketId of [
			...new Array(this.peerListConfig.numOfBuckets).keys(),
		]) {
			this.bucketIdToBucket.set(
				bucketId,
				new Map<string, P2PEnhancedPeerInfo>(),
			);
		}
	}
}