http2: add req and res options to server creation

Add optional Http2ServerRequest and Http2ServerResponse options
to createServer and createSecureServer. Allows custom req & res
classes that extend the default ones to be used without
overriding the prototype.

Backport-PR-URL: #20456
PR-URL: #15560
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/http2.md

@@ -1757,6 +1757,14 @@ changes:
   * `Http1ServerResponse` {http.ServerResponse} Specifies the ServerResponse
     class to used for HTTP/1 fallback. Useful for extending the original
     `http.ServerResponse`. **Default:** `http.ServerResponse`
+  * `Http2ServerRequest` {http2.Http2ServerRequest} Specifies the
+    Http2ServerRequest class to use.
+    Useful for extending the original `Http2ServerRequest`.
+    **Default:** `Http2ServerRequest`
+  * `Http2ServerResponse` {htt2.Http2ServerResponse} Specifies the
+    Http2ServerResponse class to use.
+    Useful for extending the original `Http2ServerResponse`.
+    **Default:** `Http2ServerResponse`
 * `onRequestHandler` {Function} See [Compatibility API][]
 * Returns: {Http2Server}
 

lib/internal/http2/compat.js

@@ -661,11 +661,11 @@ class Http2ServerResponse extends Stream {
   }
 }
 
-function onServerStream(stream, headers, flags, rawHeaders) {
+function onServerStream(ServerRequest, ServerResponse,
+                        stream, headers, flags, rawHeaders) {
   const server = this;
-  const request = new Http2ServerRequest(stream, headers, undefined,
-                                         rawHeaders);
-  const response = new Http2ServerResponse(stream);
+  const request = new ServerRequest(stream, headers, undefined, rawHeaders);
+  const response = new ServerResponse(stream);
 
   // Check for the CONNECT method
   const method = headers[HTTP2_HEADER_METHOD];

lib/internal/http2/core.js

@@ -2539,6 +2539,10 @@ function initializeOptions(options) {
   options.Http1ServerResponse = options.Http1ServerResponse ||
     http.ServerResponse;
 
+  options.Http2ServerRequest = options.Http2ServerRequest ||
+                                       Http2ServerRequest;
+  options.Http2ServerResponse = options.Http2ServerResponse ||
+                                        Http2ServerResponse;
   return options;
 }
 
@@ -2604,7 +2608,11 @@ class Http2Server extends NETServer {
 function setupCompat(ev) {
   if (ev === 'request') {
     this.removeListener('newListener', setupCompat);
-    this.on('stream', onServerStream);
+    this.on('stream', onServerStream.bind(
+      this,
+      this[kOptions].Http2ServerRequest,
+      this[kOptions].Http2ServerResponse)
+    );
   }
 }
 

test/parallel/test-http2-options-server-request.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const assert = require('assert');
+const h2 = require('http2');
+
+class MyServerRequest extends h2.Http2ServerRequest {
+  getUserAgent() {
+    return this.headers['user-agent'] || 'unknown';
+  }
+}
+
+const server = h2.createServer({
+  Http2ServerRequest: MyServerRequest
+}, (req, res) => {
+  assert.strictEqual(req.getUserAgent(), 'node-test');
+
+  res.writeHead(200, { 'Content-Type': 'text/plain' });
+  res.end();
+});
+server.listen(0);
+
+server.on('listening', common.mustCall(() => {
+
+  const client = h2.connect(`http://localhost:${server.address().port}`);
+  const req = client.request({
+    ':path': '/',
+    'User-Agent': 'node-test'
+  });
+
+  req.on('response', common.mustCall());
+
+  req.resume();
+  req.on('end', common.mustCall(() => {
+    server.close();
+    client.destroy();
+  }));
+}));

test/parallel/test-http2-options-server-response.js

@@ -0,0 +1,34 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const h2 = require('http2');
+
+class MyServerResponse extends h2.Http2ServerResponse {
+  status(code) {
+    return this.writeHead(code, { 'Content-Type': 'text/plain' });
+  }
+}
+
+const server = h2.createServer({
+  Http2ServerResponse: MyServerResponse
+}, (req, res) => {
+  res.status(200);
+  res.end();
+});
+server.listen(0);
+
+server.on('listening', common.mustCall(() => {
+
+  const client = h2.connect(`http://localhost:${server.address().port}`);
+  const req = client.request({ ':path': '/' });
+
+  req.on('response', common.mustCall());
+
+  req.resume();
+  req.on('end', common.mustCall(() => {
+    server.close();
+    client.destroy();
+  }));
+}));