DTL response null result with 404 http status DEMO code

packages/data-transport-layer/src/services/server/service.ts

@@ -8,6 +8,7 @@ import { JsonRpcProvider } from '@ethersproject/providers'
 import { LevelUp } from 'levelup'
 import * as Sentry from '@sentry/node'
 import * as Tracing from '@sentry/tracing'
+import {HttpCodes} from "../../utils";
 
 /* Imports: Internal */
 
@@ -237,7 +238,16 @@ export class L1TransportServer extends BaseService<L1TransportServerOptions> {
  this.state.app[method](route, async (req, res) => {
  const start = Date.now()
  try {
- const json = await handler(req, res)
+ // const [json, httpCode] = await handler(req, res)
+ let httpCode = HttpCodes.OK, json;
+ console.log(httpCode);
+ const result = await handler(req, res)
+ if(Array.isArray(result)) {
+ [json, httpCode] = result;
+ } else {
+ json = result;
+ }
+ console.log(httpCode);
  const elapsed = Date.now() - start
  this.logger.info('Served HTTP Request', {
  method: req.method,
@@ -249,7 +259,7 @@ export class L1TransportServer extends BaseService<L1TransportServerOptions> {
  url: req.url,
  body: json,
  })
- return res.json(json)
+ return res.status(httpCode).json(json)
  } catch (e) {
  const elapsed = Date.now() - start
  this.logger.error('Failed HTTP Request', {
@@ -498,7 +508,7 @@ export class L1TransportServer extends BaseService<L1TransportServerOptions> {
  this._registerRoute(
  'get',
  '/transaction/index/:index',
- async (req): Promise<TransactionResponse> => {
+ async (req): Promise<[TransactionResponse, HttpCodes]> => {
  const backend = req.query.backend || this.options.defaultBackend
  let transaction = null
 
@@ -518,20 +528,20 @@ export class L1TransportServer extends BaseService<L1TransportServerOptions> {
  }
 
  if (transaction === null) {
- return {
+ return [{
  transaction: null,
  batch: null,
- }
+ }, HttpCodes.NOT_FOUND]
  }
 
  const batch = await this.state.db.getTransactionBatchByIndex(
  transaction.batchIndex
  )
 
- return {
+ return [{
  transaction,
  batch,
- }
+ }, HttpCodes.OK]
  }
  )