продолжаем вносить все

lib/table.js

@@ -0,0 +1,72 @@
+'use strict'
+
+const crypto = require('crypto')
+
+class Node {
+	static generateID() {
+		return crypto.createHash('sha1').update(crypto.randomBytes(20)).digest()
+	}
+
+	constructor(id) {
+		this.id = id || Node.generateNodeID()
+	}
+
+	static neighbor(target, id) {
+		return Buffer.concat([target.slice(0, 10), id.slice(10)])
+	}
+
+	static encodeNodes(nodes) {
+		return Buffer.concat(nodes.map((node)=> Buffer.concat([node.id, Node.encodeIP(node.address), Node.encodePort(node.port)])))
+	}
+
+	static decodeNodes(data) {
+		const nodes = []
+		for (let i = 0; i + 26 <= data.length; i += 26) {
+			nodes.push({
+				id: data.slice(i, i + 20),
+				address: `${data[i + 20]}.${data[i + 21]}.${data[i + 22]}.${data[i + 23]}`,
+				port: data.readUInt16BE(i + 24)
+			})
+		}
+		return nodes
+	}
+
+	static encodeIP(ip) {
+		return Buffer.from(ip.split('.').map((i)=>parseInt(i)))
+	}
+
+	static encodePort(port) {
+		const data = Buffer.alloc(2)
+		data.writeUInt16BE(port, 0)
+		return data
+	}
+}
+
+class Table{
+	constructor(cap) {
+		this.id = Node.generateID()
+		this.nodes = []
+		this.caption = cap
+	}
+	add(node) {
+		if (this.nodes.length < this.caption) {
+			this.nodes.push(node)
+		}
+	}
+	shift() {
+		return this.nodes.shift()
+	}
+	size() {
+		return this.nodes.length;
+	}
+	first() {
+		if(this.nodes.length >= 8) {
+			return this.nodes.slice(0, 8)
+		}else if(this.nodes.length > 0) {
+			return new Array(8).join().split(',').map(()=> this.nodes[0])
+		}
+		return []
+	}
+}
+
+module.exports = {Table, Node}