fix: don't leak internal class

docs/docs/api/DiagnosticsChannel.md

@@ -20,8 +20,6 @@ diagnosticsChannel.channel('undici:request:create').subscribe(({ request }) => {
   console.log('method', request.method)
   console.log('path', request.path)
   console.log('headers') // array of strings, e.g: ['foo', 'bar']
-  request.addHeader('hello', 'world')
-  console.log('headers', request.headers) // e.g. ['foo', 'bar', 'hello', 'world']
 })
 ```
 

lib/core/request.js

@@ -91,6 +91,8 @@ class Request {
 
     this.abort = null
 
+    this.publicInterface = null
+
     if (body == null) {
       this.body = null
     } else if (isStream(body)) {
@@ -187,10 +189,32 @@ class Request {
     this[kHandler] = handler
 
     if (channels.create.hasSubscribers) {
-      channels.create.publish({ request: this })
+      channels.create.publish({ request: this.getPublicInterface() })
     }
   }
 
+  getPublicInterface () {
+    const self = this
+    this.publicInterface ??= {
+      get origin () {
+        return self.origin
+      },
+      get method () {
+        return self.method
+      },
+      get path () {
+        return self.path
+      },
+      get headers () {
+        return self.headers
+      },
+      get completed () {
+        return self.completed
+      }
+    }
+    return this.publicInterface
+  }
+
   onBodySent (chunk) {
     if (this[kHandler].onBodySent) {
       try {
@@ -203,7 +227,7 @@ class Request {
 
   onRequestSent () {
     if (channels.bodySent.hasSubscribers) {
-      channels.bodySent.publish({ request: this })
+      channels.bodySent.publish({ request: this.getPublicInterface() })
     }
 
     if (this[kHandler].onRequestSent) {
@@ -236,7 +260,7 @@ class Request {
     assert(!this.completed)
 
     if (channels.headers.hasSubscribers) {
-      channels.headers.publish({ request: this, response: { statusCode, headers, statusText } })
+      channels.headers.publish({ request: this.getPublicInterface(), response: { headers, statusText, statusCode } })
     }
 
     try {
@@ -272,7 +296,7 @@ class Request {
 
     this.completed = true
     if (channels.trailers.hasSubscribers) {
-      channels.trailers.publish({ request: this, trailers })
+      channels.trailers.publish({ request: this.getPublicInterface(), trailers })
     }
 
     try {
@@ -287,7 +311,7 @@ class Request {
     this.onFinally()
 
     if (channels.error.hasSubscribers) {
-      channels.error.publish({ request: this, error })
+      channels.error.publish({ request: this.getPublicInterface(), error })
     }
 
     if (this.aborted) {
@@ -309,11 +333,6 @@ class Request {
       this.endHandler = null
     }
   }
-
-  addHeader (key, value) {
-    processHeader(this, key, value)
-    return this
-  }
 }
 
 function processHeader (request, key, val) {

lib/dispatcher/client-h1.js

@@ -993,7 +993,7 @@ function writeH1 (client, request) {
   }
 
   if (channels.sendHeaders.hasSubscribers) {
-    channels.sendHeaders.publish({ request, headers: header, socket })
+    channels.sendHeaders.publish({ request: request.getPublicInterface(), headers: header, socket })
   }
 
   /* istanbul ignore else: assertion */

test/node-test/diagnostics-channel/get.js

@@ -7,7 +7,7 @@ const { Client } = require('../../..')
 const { createServer } = require('node:http')
 
 test('Diagnostics channel - get', (t) => {
-  const assert = tspl(t, { plan: 32 })
+  const assert = tspl(t, { plan: 31 })
   const server = createServer((req, res) => {
     res.setHeader('Content-Type', 'text/plain')
     res.setHeader('trailer', 'foo')
@@ -33,8 +33,6 @@ test('Diagnostics channel - get', (t) => {
     assert.equal(request.method, 'GET')
     assert.equal(request.path, '/')
     assert.deepStrictEqual(request.headers, ['bar', 'bar'])
-    request.addHeader('hello', 'world')
-    assert.deepStrictEqual(request.headers, ['bar', 'bar', 'hello', 'world'])
   })
 
   let _connector

test/node-test/diagnostics-channel/post-stream.js

@@ -8,7 +8,7 @@ const { Client } = require('../../..')
 const { createServer } = require('node:http')
 
 test('Diagnostics channel - post stream', (t) => {
-  const assert = tspl(t, { plan: 33 })
+  const assert = tspl(t, { plan: 31 })
   const server = createServer((req, res) => {
     req.resume()
     res.setHeader('Content-Type', 'text/plain')
@@ -34,9 +34,6 @@ test('Diagnostics channel - post stream', (t) => {
     assert.equal(request.method, 'POST')
     assert.equal(request.path, '/')
     assert.deepStrictEqual(request.headers, ['bar', 'bar'])
-    request.addHeader('hello', 'world')
-    assert.deepStrictEqual(request.headers, ['bar', 'bar', 'hello', 'world'])
-    assert.deepStrictEqual(request.body, body)
   })
 
   let _connector

test/node-test/diagnostics-channel/post.js

@@ -7,7 +7,7 @@ const { Client } = require('../../../')
 const { createServer } = require('node:http')
 
 test('Diagnostics channel - post', (t) => {
-  const assert = tspl(t, { plan: 33 })
+  const assert = tspl(t, { plan: 31 })
   const server = createServer((req, res) => {
     req.resume()
     res.setHeader('Content-Type', 'text/plain')
@@ -32,9 +32,6 @@ test('Diagnostics channel - post', (t) => {
     assert.equal(request.method, 'POST')
     assert.equal(request.path, '/')
     assert.deepStrictEqual(request.headers, ['bar', 'bar'])
-    request.addHeader('hello', 'world')
-    assert.deepStrictEqual(request.headers, ['bar', 'bar', 'hello', 'world'])
-    assert.deepStrictEqual(request.body, Buffer.from('hello world'))
   })
 
   let _connector

types/diagnostics-channel.d.ts

@@ -6,16 +6,10 @@ import Dispatcher from "./dispatcher";
 declare namespace DiagnosticsChannel {
   interface Request {
     origin?: string | URL;
-    completed: boolean;
     method?: Dispatcher.HttpMethod;
     path: string;
-    headers: string;
-    addHeader(key: string, value: string): Request;
-  }
-  interface Response {
-    statusCode: number;
-    statusText: string;
-    headers: Array<Buffer>;
+    headers: any;
+    completed: boolean;
   }
   type Error = unknown;
   interface ConnectParams {
@@ -34,7 +28,9 @@ declare namespace DiagnosticsChannel {
   }
   export interface RequestHeadersMessage {
     request: Request;
-    response: Response;
+    headers: Array<Buffer>;
+    statusCode: number;
+    statusText: string;
   }
   export interface RequestTrailersMessage {
     request: Request;