Add request flow handler

Readme.md

@@ -0,0 +1,32 @@
+# NodeName-Core
+This repository is part of the NodeName Project, a simple to use and very flexible Nameserver implementation for NodeJS.
+
+## What does this NodeName-Core contain?
+
+NodeName-Core is responsible for several things:
+
+- parsing incoming DNS requests
+- serializing outgoing answers
+- providing storage backend API definition
+
+## API
+
+``` JavaScript
+   const Core = new DnsCore();
+   Core.addStorage(new AnyStoragePlugin(options), timeout?);
+   // One or multiple storage plugins
+   // All Storage engines are requested at the same time all their results will be processed
+   // Optionally an timeout can be defined after wich this storage engine will be ignored
+   // If no others answer an error is returned in Response
+
+   Core.addMonitoring(new MonitoringPlugin(options));
+   // Async called Monmitoring plugin.
+
+   Core.addListener(new ListenetPlugin(options));
+
+   // The question plugin can handle on or more Questions and needs to
+   // make shure, that it creates the desired output. It is responsible
+   // for handeling the question and optionally add additional questions
+   // to be resolved.
+   Core.addQuestionHandler(new QuestionPlugin(options));
+```

package.json

@@ -28,4 +28,4 @@
       "binary-parser": "^1.3.2",
       "lru-cache": "^5.1.1"
    }
-}
+}

src/benchmark.ts

@@ -0,0 +1,171 @@
+import { Request, parseInput } from "./request";
+import { RDATARecord, RecourceRecord } from "./record";
+import { MonitoringPlugin, QuestionPlugin, DnsCore, AnswerHandler, ListenerPlugin, StoragePlugin, Record } from ".";
+import assert = require("assert");
+import { RecordTypes } from "./types";
+import { Question } from "./question";
+
+function fromHex(data: string) {
+   return Buffer.from(data.replace(/\s/g, ""), "hex");
+}
+
+const itr = 100000;
+console.log("All tests x" + itr);
+
+let reqData = fromHex("E835 0100 0001 0000 0000 0000 07 6578616D706c65 03636F6D 00 0001 0001");
+console.time("input parser")
+for (let i = 0; i < itr; i++) {
+   parseInput(reqData);
+}
+console.timeEnd("input parser")
+
+console.time("complete")
+for (let i = 0; i < itr; i++) {
+   let request = new Request(reqData, "")
+   let rr = new RDATARecord()
+   rr.CLASS = 1
+   rr.NAME = "example.com"
+   rr.TTL = 1600
+   rr.TYPE = 1
+   rr.RDATA = fromHex("0A 00 00 01")
+   request.addAnswer(rr)
+   request.serialize()
+}
+console.timeEnd("complete")
+
+console.time("complete 10 answers")
+for (let i = 0; i < itr; i++) {
+   let request = new Request(reqData, "")
+   let rr = new RDATARecord()
+   rr.CLASS = 1
+   rr.NAME = "example.com"
+   rr.TTL = 1600
+   rr.TYPE = 1
+   rr.RDATA = fromHex("0A 00 00 01")
+   for (let i = 0; i < 10; i++) request.addAnswer(rr);
+   request.serialize()
+}
+console.timeEnd("complete 10 answers")
+
+class TestMonitoringPlugin implements MonitoringPlugin {
+   constructor() { }
+   async init(core) { }
+   Priority = 0
+   onRequest(domain, hostname, type) { }
+}
+
+class ARR extends RecourceRecord {
+   TYPE = RecordTypes.A
+
+   constructor(domain: string, ip: string) {
+      super();
+      this.NAME = domain
+      this.TTL = 1600
+      let data = Buffer.alloc(4)
+      let idx = 0;
+      ip.split(".").forEach(e => {
+         data.writeUInt8(Number(e), idx);
+         idx++;
+      })
+      this.dataLock = () => {
+         return {
+            length: 4,
+            serialize: (buffer, offset) => {
+               data.copy(buffer, offset);
+               return offset + 4;
+            }
+         }
+      };
+   }
+}
+
+class TestQuestionPlugin implements QuestionPlugin {
+   private Core: DnsCore
+   QuestionTypes = [RecordTypes.A]
+   Priority = 0
+   async init(core) {
+      this.Core = core;
+   }
+
+   async handleQuestion(question: Question, request: AnswerHandler, next: () => void) {
+      assert(this.QuestionTypes.find(e => e === <any>question.QTYPE), "Handler was called with not supported question type")
+      let parts = question.QNAME.split(".")
+      let domain = parts.splice(-2, 2).join(".")
+      let hostname = parts.join(".");
+      hostname = hostname !== "" ? hostname : "*"
+      let records = await this.Core.storageManager.getRecords(domain, hostname, question.QTYPE)
+      records.forEach(e => request.addAnswer(new ARR(question.QNAME, e.value)));
+   }
+}
+
+class TestListenerPlugin implements ListenerPlugin {
+   async init(core) { }
+   Priority = 0;
+   callback: (data: Buffer, sender: string, max_size?: number) => Promise<Buffer>;
+   registerCallback(callback) {
+      this.callback = callback;
+   }
+
+   sendRequest(message: Buffer) {
+      return this.callback(message, "localhost")
+   }
+}
+
+
+class TestStoragePlugin implements StoragePlugin {
+   re: Record = { domain: "example.com", hostname: "test", type: RecordTypes.A, value: "10.0.0.1", ttl: 1600 }
+
+   constructor(record?: Record, private count: number = 1) {
+      if (record)
+         this.re = record;
+   }
+
+   Priority = 0
+   NoCache = false
+   RecordTypes = [RecordTypes.A]
+   isResponsible(domain: string) {
+      // console.log("Is responsible")
+      return true
+   }
+
+   async init(core) { }
+
+   async getRecords(domain, hostname, type) {
+      if (domain !== this.re.domain || hostname !== this.re.hostname || type != this.re.type) return undefined;
+      let r = [];
+      for (let i = 0; i < this.count; i++) {
+         r.push(this.re);
+      }
+      return r;
+   }
+
+   async getAllRecordsForDomain(domain) {
+      if (domain !== this.re.domain) return undefined;
+      return [this.re];
+   }
+}
+
+let core = new DnsCore();
+
+let listener = new TestListenerPlugin();
+core.addListener(listener)
+core.addMonitoring(new TestMonitoringPlugin());
+core.addQuestion(new TestQuestionPlugin())
+
+let storage = new TestStoragePlugin({
+   domain: "example.com",
+   hostname: "test",
+   type: RecordTypes.A,
+   ttl: 500,
+   value: "10.0.0.1"
+}, 3)
+core.addStorage(storage);
+
+core.start().then(async () => {
+   let reqData = fromHex("E835 0100 0001 0000 0000 0000 04 74657374 07 6578616D706c65 03 636F6D 00 0001 0001");
+   console.time("core handler");
+   for (let i = 0; i < itr; i++) {
+      await listener.sendRequest(reqData)
+   }
+   console.timeEnd("core handler");
+});

src/index.ts

@@ -1,7 +1,309 @@
-import * as Types from "./types";
+import { Request } from "./request";
-import * as Request from "./request"
+import { RecordTypes } from "./types";
+import * as LRU from "lru-cache";
+import { Writable } from "stream";
+import { Question } from "./question";
+import { RecourceRecord } from "./record";
 
-export = {
+// export class AnswerSteam extends Writable {
-   types: Types,
+
-   request: Request
+// }
+
+export interface Record {
+   type: RecordTypes
+   domain: string
+   hostname: string
+   value: string
+   ttl: number
+   priority?: number
+   additional?: string
 }
+
+export interface Plugin {
+   /**
+    * This sets the priority of this Plugin.
+    *
+    * The lower the value, the higher priority.
+    * It is recommended to make this value changeable over the cosntructor options field.
+    */
+   Priority: number
+
+   init(core: DnsCore): Promise<void>
+}
+
+export interface ListenerPlugin extends Plugin {
+   /**
+    * This method is for registering a callback that is called
+    * when packet is received and ready for parsing.
+    * The function returns the Answer data. Errors shouldn't be possible
+    * by this function
+    */
+   registerCallback(callback: (data: Buffer, sender: string, max_size?: number) => Promise<Buffer>): void
+   registerCallback(callback: (data: Buffer, sender: string, answer: Writable) => Promise<void>)
+}
+
+export class ListenerManager {
+   private _listener: ListenerPlugin[] = []
+
+   add(listener: ListenerPlugin) {
+      this._listener.push(listener)
+   }
+
+   setup(core: DnsCore) {
+      return Promise.all(this._listener.map(e => e.init(core)))
+   }
+
+   registerCallback(callback: (data: Buffer, sender: string, max_size?: number) => Promise<Buffer>) {
+      this._listener.forEach(e => e.registerCallback(callback))
+   }
+}
+
+export interface MonitoringPlugin extends Plugin {
+   onRequest(domain: string, hostname: string, type: RecordTypes, additionalInformations): void
+}
+
+export class MonitoringManager {
+   private _monitoring: MonitoringPlugin[] = []
+
+   add(monitoring: MonitoringPlugin) {
+      this._monitoring.push(monitoring)
+   }
+
+   setup(core: DnsCore) {
+      return Promise.all(this._monitoring.map(e => e.init(core)))
+   }
+
+   onRequest(domain: string, hostname: string, type: RecordTypes, additionalInformations) {
+      this._monitoring.forEach(e => e.onRequest(domain, hostname, type, additionalInformations))
+   }
+}
+
+export interface StoragePlugin extends Plugin {
+   /**
+    * Here you can define wich record types this storage plugin is capable of.
+    */
+   RecordTypes: RecordTypes[]
+
+   /**
+    * Disables record caching for this Storage
+    */
+   NoCache: boolean;
+
+   /**
+    * Returns if storage plugin is responsible for this domain.
+    * This check is synchroneus because it should be quick.
+    *
+    * @param domain The domain for check
+    */
+   isResponsible(domain: string): boolean
+   getRecords(domain: string, hostname: string, type: RecordTypes): Promise<Record[] | undefined>
+   getAllRecordsForDomain(domain: string): Promise<Record[]>
+}
+
+type SortedStorage = {
+   [P in keyof any]: StoragePlugin[] | undefined
+}
+
+const cacheoptions: LRU.Options = {
+   length: () => 1,
+   max: 500,
+   maxAge: 10 * 60 * 1000
+}
+
+class RecordCache {
+   private cache = new LRU<string, Record[]>(cacheoptions);
+
+   getRecords(domain: string, hostname: string, type: RecordTypes) {
+      let key = `${domain};;${hostname};;${RecordTypes[type]}`;
+      let rec = this.cache.get(key)
+      if (!rec) {
+         return undefined;
+      }
+      return rec;
+   }
+
+   addRecords(domain: string, hostname: string, type: RecordTypes, records: Record[], ttl: number) {
+      let key = `${domain};;${hostname};;${RecordTypes[type]}`;
+      this.cache.set(key, records, ttl);
+   }
+}
+
+export class StorageManager {
+   private _storages: StoragePlugin[] = []
+   private _sorted: SortedStorage;
+   private _cache = new RecordCache();
+
+   add(storage: StoragePlugin) {
+      this._storages.push(storage)
+   }
+
+   private presort() {
+      this._storages = this._storages.sort((e1, e2) => e1.Priority - e2.Priority)
+      this._sorted = <any>{}
+      for (let key in RecordTypes) {
+         let key_n = Number(key)
+         if (key_n !== Number.NaN) {
+            //The _storages list is sorted with priority.
+            this._sorted[key_n] = this._storages.filter(e => e.RecordTypes.find(t => t === key_n) !== undefined)
+         }
+      }
+   }
+
+   setup(core: DnsCore) {
+      this.presort()
+      return Promise.all(this._storages.map(e => e.init(core)))
+   }
+
+   async getAllRecordsForDomain(domain: string) {
+      return this._storages.find(e => e.isResponsible(domain)).getAllRecordsForDomain(domain);
+   }
+
+   async getRecords(domain: string, hostname: string, type: RecordTypes) {
+      // First check if record is cached. Since the dns entries should not chacnge quickly
+      // using the cach for quicker response times is the way to go.
+      let records = this._cache.getRecords(domain, hostname, type);
+      if (records) return records;
+
+      let storages = this._sorted[type].filter(s => s.isResponsible(domain));
+      if (!storages || storages.length <= 0) return undefined
+
+      let nocache = false;
+      for (let storage of storages) {
+         nocache = storage.NoCache || nocache;
+         records = await storage.getRecords(domain, hostname, type)
+         if (records) {
+            if (storage.NoCache) this._cache.addRecords(domain, hostname, type, records, records.length <= 0 ? 3600 : records[0].ttl)
+            return records;
+         }
+      }
+
+      // If any of the checked storage engines that is
+      // responsible for the domain has the noCache flag,
+      // caching will be disabled for all.
+      if (!nocache)
+         this._cache.addRecords(domain, hostname, type, [], 0);
+      return [];
+   }
+}
+
+export interface AnswerHandler {
+   addQuestion: (question: Question) => void;
+   addAnswer: (record: RecourceRecord) => void;
+   addAdditional: (record: RecourceRecord) => void;
+   addAutority: (record: RecourceRecord) => void
+}
+
+export interface QuestionPlugin extends Plugin {
+   /**
+    * This field defines wich question types this plugin is capable of handling.
+    */
+   QuestionTypes: RecordTypes[];
+   init(core: DnsCore): Promise<void>
+
+   /**
+    *
+    * @param question The question this plugin should solve
+    * @param request This gives the plugin access to relevant
+    *  functions for queing depending questions or adding answers etc.
+    * @param next This function should be called if the plugin is not able to resolve
+    *  the request. This will trigger other handlers.
+    */
+   handleQuestion(question: Question, request: AnswerHandler, next: () => void): Promise<void>
+}
+
+export class QuestionManager {
+   private _questions: QuestionPlugin[] = [];
+   private _sorted = <any>{};
+   add(question: QuestionPlugin) {
+      this._questions.push(question);
+   }
+
+   private sort() {
+      this._questions = this._questions.sort((e1, e2) => e1.Priority - e2.Priority);
+      this._sorted = {};
+      for (let key in RecordTypes) {
+         let key_n = Number(key)
+         if (key_n !== Number.NaN) {
+            this._sorted[key_n] = this._questions.filter(e => e.QuestionTypes.find(t => t === key_n) !== undefined)
+         }
+      }
+   }
+
+   setup(core: DnsCore) {
+      this.sort();
+      return Promise.all(this._questions.map(e => e.init(core)))
+   }
+
+   async handleQuestion(question: Question, request: AnswerHandler) {
+      let handlers: QuestionPlugin[] = this._sorted[question.QTYPE];
+      if (!handlers || handlers.length <= 0) return;
+      let index = 0;
+      while (index < handlers.length) {
+         let i = index;
+         await handlers[i].handleQuestion(question, request, () => {
+            index++;
+         })
+         if (i === index) break;
+      }
+   }
+}
+
+export class DnsCore {
+   storageManager: StorageManager;
+   addStorage(plugin: StoragePlugin) {
+      this.storageManager.add(plugin);
+   }
+   monitoringManager: MonitoringManager;
+   addMonitoring(plugin: MonitoringPlugin) {
+      this.monitoringManager.add(plugin);
+   }
+   listenerManager: ListenerManager;
+   addListener(plugin: ListenerPlugin) {
+      this.listenerManager.add(plugin);
+   }
+
+   questionManager: QuestionManager;
+   addQuestion(plugin: QuestionPlugin) {
+      this.questionManager.add(plugin);
+   }
+
+   constructor() {
+      this.listenerManager = new ListenerManager()
+      this.monitoringManager = new MonitoringManager()
+      this.storageManager = new StorageManager()
+      this.questionManager = new QuestionManager()
+   }
+
+   async start() {
+      await this.storageManager.setup(this);
+      await this.monitoringManager.setup(this);
+      await this.listenerManager.setup(this);
+      await this.questionManager.setup(this);
+      this.listenerManager.registerCallback(this.onMessage.bind(this));
+   }
+
+   private async onMessage(data: Buffer, sender: string, max_size: number = 0) {
+      let request = new Request(data, sender, max_size);
+      let questionqueue: Promise<void>[] = [];
+      let handleQuestion = question => {
+         let prom = this.questionManager.handleQuestion(question, {
+            addAdditional: record => {
+               request.addAdditionals(record)
+            },
+            addAnswer: record => {
+               request.addAnswer(record);
+            },
+            addAutority: record => {
+               request.addAuthorities(record);
+            },
+            addQuestion: question => {
+               handleQuestion(question)
+            }
+         })
+         questionqueue.push(prom);
+      }
+      request.questions.map(q => handleQuestion(q));
+      await Promise.all(questionqueue);
+      return request.serialize();
+   }
+}

src/request.ts

@@ -1,6 +1,6 @@
 import { Parser } from "binary-parser"
 import { IMessageHeader, IMessageQuestion, MessageRecourceRecord, ErrorCodes } from "./types"
-import { Serializer } from "./serializeable";
+import { Serializer, Serializeable } from "./serializeable";
 import { Question } from "./question";
 import { RecourceRecord } from "./record";
 import { Header } from "./header";
@@ -68,12 +68,23 @@ export class Request {
 
    private _questions: Question[];
    get questions() {
-      return this._questions.map(e => Object.assign({}, e));
+      return this._questions.map(e => new Question(e));
    }
 
-   public _answers: RecourceRecord[] = [];
+   private _answers: Serializer[] = [];
-   public _authorities: RecourceRecord[] = [];
+   addAnswer(rr: RecourceRecord) {
-   public _additionals: RecourceRecord[] = [];
+      this._answers.push(rr.lock())
+   }
+
+   private _authorities: Serializer[] = [];
+   addAuthorities(rr: RecourceRecord) {
+      this._authorities.push(rr.lock())
+   }
+
+   private _additionals: Serializer[] = [];
+   addAdditionals(rr: RecourceRecord) {
+      this._additionals.push(rr.lock())
+   }
 
    constructor(packet: Buffer, public sender: string, private max_size = 0) {
       let parsed = parseInput(packet);
@@ -103,9 +114,9 @@ export class Request {
 
       let header = this._header.lock();
       let questions = this._questions.map(e => e.lock())
-      let answers = this._answers.map(e => e.lock())
+      let answers = this._answers;
-      let authority = this._authorities.map(e => e.lock())
+      let authority = this._authorities;
-      let additional = this._additionals.map(e => e.lock())
+      let additional = this._additionals;
 
       let length = header.length;
       questions.forEach(e => length += e.length);

src/test.ts

@@ -2,7 +2,7 @@ import { assert } from "chai";
 
 import { parseInput, Request, questionParser, headerParser } from "./request"
 import { IMessageHeader, RecordTypes } from "./types";
-import { RDATARecord } from "./record";
+import { RDATARecord, RecourceRecord } from "./record";
 import { Question } from "./question";
 import { Header } from "./header";
 
@@ -332,8 +332,187 @@ describe("parser", function () {
       rr.TTL = 1600
       rr.TYPE = 1
       rr.RDATA = fromHex("0A 00 00 01")
-      request._answers.push(rr)
+      request.addAnswer(rr);
       let data = request.serialize()
       assert.equal(data.toString("hex"), should.replace(/\s/g, "").toLowerCase(), "Whole packet serialization failed")
    })
-})
+})
+
+import { DnsCore, StoragePlugin, Record, MonitoringPlugin, QuestionPlugin, AnswerHandler, ListenerPlugin } from "./index"
+
+describe("DNS Core", function () {
+   it("Initialization", () => {
+      let core = new DnsCore();
+      assert.exists(core, "Core constructor working")
+   })
+
+   it("Adding fake plugins and initialize", () => {
+      let core = new DnsCore();
+
+      core.addListener({
+         init: async (c) => { assert.exists(c, "Core not defined on Plugin init") },
+         Priority: 0,
+         registerCallback: () => { }
+      })
+
+      core.addMonitoring({
+         init: async (c) => { assert.exists(c, "Core not defined on Plugin init") },
+         Priority: 0,
+         onRequest: () => { }
+      })
+
+      core.addQuestion({
+         init: async (c) => { assert.exists(c, "Core not defined on Plugin init") },
+         QuestionTypes: [RecordTypes.A],
+         Priority: 0,
+         handleQuestion: async () => { },
+      })
+
+      core.addStorage({
+         getAllRecordsForDomain: async () => undefined,
+         getRecords: async () => undefined,
+         init: async (c) => { assert.exists(c, "Core not defined on Plugin init") },
+         isResponsible: () => true,
+         NoCache: false,
+         Priority: 0,
+         RecordTypes: [RecordTypes.A]
+      })
+
+      return core.start();
+   })
+
+   it("Test Request flow", async function () {
+      let core = new DnsCore();
+
+      let listener = new TestListenerPlugin();
+      core.addListener(listener)
+
+      let monitoring = new TestMonitoringPlugin({
+         domain: "example.com",
+         hostname: "test",
+         type: "A"
+      });
+      core.addMonitoring(monitoring)
+
+
+      let question = new TestQuestionPlugin();
+      core.addQuestion(question)
+
+      let storage = new TestStoragePlugin({
+         domain: "example.com",
+         hostname: "test",
+         type: RecordTypes.A,
+         ttl: 500,
+         value: "10.0.0.1"
+      })
+      core.addStorage(storage);
+
+      await core.start();
+
+      let reqData = fromHex("E835 0100 0001 0000 0000 0000 04 74657374 07 6578616D706c65 03 636F6D 00 0001 0001");
+      let should = "E835 8580 0001000100000000 04 74657374 076578616D706C6503636F6D0000010001 04 74657374 07 6578616D706C65 03 636F6D 00 0001 0001 0000 0640 0004 0A000001"
+      let resData = await listener.sendRequest(reqData)
+
+      assert.equal(resData.toString("hex"), should.replace(/\s/g, "").toLowerCase(), "Whole packet serialization failed")
+   })
+})
+
+class TestStoragePlugin implements StoragePlugin {
+   re: Record = { domain: "example.com", hostname: "test", type: RecordTypes.A, value: "10.0.0.1", ttl: 1600 }
+
+   constructor(record?: Record) {
+      if (record)
+         this.re = record;
+   }
+
+   Priority = 0
+   NoCache = false
+   RecordTypes = [RecordTypes.A]
+   isResponsible(domain: string) {
+      // console.log("Is responsible")
+      return true
+   }
+
+   async init(core) { assert.exists(core, "TestStoragePlugin init no core object") }
+
+   async getRecords(domain, hostname, type) {
+      if (domain !== this.re.domain || hostname !== this.re.hostname || type != this.re.type) return undefined;
+      return [this.re];
+   }
+
+   async getAllRecordsForDomain(domain) {
+      if (domain !== this.re.domain) return undefined;
+      return [this.re];
+   }
+}
+
+class TestMonitoringPlugin implements MonitoringPlugin {
+   constructor(private should: { domain: string, hostname: string, type: string }) { }
+
+   async init(core) { assert.exists(core, "TestMonitoringPlugin init no core object") }
+   Priority = 0
+   onRequest(domain, hostname, type) {
+      assert.equal(this.should.domain, domain, "Domain value wrong")
+      assert.equal(this.should.hostname, hostname, "Domain value wrong")
+      assert.equal(this.should.type, type, "Domain value wrong")
+   }
+}
+
+class ARR extends RecourceRecord {
+   TYPE = RecordTypes.A
+
+   constructor(domain: string, ip: string) {
+      super();
+      this.NAME = domain
+      this.TTL = 1600
+      let data = Buffer.alloc(4)
+      let idx = 0;
+      ip.split(".").forEach(e => {
+         data.writeUInt8(Number(e), idx);
+         idx++;
+      })
+      this.dataLock = () => {
+         return {
+            length: 4,
+            serialize: (buffer, offset) => {
+               data.copy(buffer, offset);
+               return offset + 4;
+            }
+         }
+      };
+      // this.RDATA = data;
+   }
+}
+
+class TestQuestionPlugin implements QuestionPlugin {
+   private Core: DnsCore
+   QuestionTypes = [RecordTypes.A]
+   Priority = 0
+   async init(core) {
+      assert.exists(core, "TestQuestionPlugin init no core object")
+      this.Core = core;
+   }
+
+   async handleQuestion(question: Question, request: AnswerHandler, next: () => void) {
+      assert(this.QuestionTypes.find(e => e === <any>question.QTYPE), "Handler was called with not supported questin type")
+      let parts = question.QNAME.split(".")
+      let domain = parts.splice(-2, 2).join(".")
+      let hostname = parts.join(".");
+      hostname = hostname !== "" ? hostname : "*"
+      let records = await this.Core.storageManager.getRecords(domain, hostname, question.QTYPE)
+      records.forEach(e => request.addAnswer(new ARR(question.QNAME, e.value)));
+   }
+}
+
+class TestListenerPlugin implements ListenerPlugin {
+   async init(core) { assert.exists(core, "TestListenerPlugin init no core object") }
+   Priority = 0;
+   callback: (data: Buffer, sender: string, max_size?: number) => Promise<Buffer>;
+   registerCallback(callback) {
+      this.callback = callback;
+   }
+
+   sendRequest(message: Buffer) {
+      return this.callback(message, "localhost")
+   }
+}

src/types.ts

@@ -305,10 +305,3 @@ export interface MessageRecourceRecord {
     */
    RDATA: Buffer;
 }
-// export interface IMessage {
-//    header: IMessageHeader;
-//    questions: IMessageQuestion[];
-//    _answers: MessageRecourceRecord[];
-//    _authorities: MessageRecourceRecord[];
-//    _additionals: MessageRecourceRecord[];
-// }