http2: implement capture rection for 'request' and 'stream' events

PR-URL: #27867
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

lib/internal/http2/core.js

@@ -1388,6 +1388,17 @@ class Http2Session extends EventEmitter {
     this[kMaybeDestroy]();
   }
 
+  [EventEmitter.captureRejectionSymbol](err, event, ...args) {
+    switch (event) {
+      case 'stream':
+        const [stream] = args;
+        stream.destroy(err);
+        break;
+      default:
+        this.destroy(err);
+    }
+  }
+
   // Destroy the session if:
   // * error is not undefined/null
   // * session is closed and there are no more pending or open streams
@@ -2875,6 +2886,40 @@ class Http2Server extends NETServer {
   }
 }
 
+Http2Server.prototype[EventEmitter.captureRejectionSymbol] = function(
+  err, event, ...args) {
+
+  switch (event) {
+    case 'stream':
+      // TODO(mcollina): we might want to match this with what we do on
+      // the compat side.
+      const [stream] = args;
+      if (stream.sentHeaders) {
+        stream.destroy(err);
+      } else {
+        stream.respond({ [HTTP2_HEADER_STATUS]: 500 });
+        stream.end();
+      }
+      break;
+    case 'request':
+      const [, res] = args;
+      if (!res.headersSent && !res.finished) {
+        // Don't leak headers.
+        for (const name of res.getHeaderNames()) {
+          res.removeHeader(name);
+        }
+        res.statusCode = 500;
+        res.end(http.STATUS_CODES[500]);
+      } else {
+        res.destroy();
+      }
+      break;
+    default:
+      net.Server.prototype[EventEmitter.captureRejectionSymbol]
+        .call(this, err, event, ...args);
+  }
+};
+
 function setupCompat(ev) {
   if (ev === 'request') {
     this.removeListener('newListener', setupCompat);

test/parallel/test-http2-capture-rejection.js

@@ -0,0 +1,152 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const events = require('events');
+const { createServer, connect } = require('http2');
+
+events.captureRejections = true;
+
+{
+  // Test error thrown in the server 'stream' event,
+  // after a respond()
+
+  const server = createServer();
+  server.on('stream', common.mustCall(async (stream) => {
+    server.close();
+
+    stream.respond({ ':status': 200 });
+
+    const _err = new Error('kaboom');
+    stream.on('error', common.mustCall((err) => {
+      assert.strictEqual(err, _err);
+    }));
+    throw _err;
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    const { port } = server.address();
+    const session = connect(`http://localhost:${port}`);
+
+    const req = session.request();
+
+    req.on('error', common.mustCall((err) => {
+      assert.strictEqual(err.code, 'ERR_HTTP2_STREAM_ERROR');
+    }));
+
+    req.on('close', common.mustCall(() => {
+      session.close();
+    }));
+  }));
+}
+
+{
+  // Test error thrown in the server 'stream' event,
+  // before a respond().
+
+  const server = createServer();
+  server.on('stream', common.mustCall(async (stream) => {
+    server.close();
+
+    stream.on('error', common.mustNotCall());
+
+    throw new Error('kaboom');
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    const { port } = server.address();
+    const session = connect(`http://localhost:${port}`);
+
+    const req = session.request();
+
+    req.on('response', common.mustCall((headers) => {
+      assert.strictEqual(headers[':status'], 500);
+    }));
+
+    req.on('close', common.mustCall(() => {
+      session.close();
+    }));
+  }));
+}
+
+
+{
+  // Test error thrown in 'request' event
+
+  const server = createServer(common.mustCall(async (req, res) => {
+    server.close();
+    res.setHeader('content-type', 'application/json');
+    const _err = new Error('kaboom');
+    throw _err;
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    const { port } = server.address();
+    const session = connect(`http://localhost:${port}`);
+
+    const req = session.request();
+
+    req.on('response', common.mustCall((headers) => {
+      assert.strictEqual(headers[':status'], 500);
+      assert.strictEqual(Object.hasOwnProperty.call(headers, 'content-type'),
+                         false);
+    }));
+
+    req.on('close', common.mustCall(() => {
+      session.close();
+    }));
+
+    req.resume();
+  }));
+}
+
+{
+  // Test error thrown in the client 'stream' event
+
+  const server = createServer();
+  server.on('stream', common.mustCall(async (stream) => {
+    const { port } = server.address();
+
+    server.close();
+
+    stream.pushStream({
+      ':scheme': 'http',
+      ':path': '/foobar',
+      ':authority': `localhost:${port}`,
+    }, common.mustCall((err, push) => {
+      push.respond({
+        'content-type': 'text/html',
+        ':status': 200
+      });
+      push.end('pushed by the server');
+
+      stream.end('test');
+    }));
+
+    stream.respond({
+      ':status': 200
+    });
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    const { port } = server.address();
+    const session = connect(`http://localhost:${port}`);
+
+    const req = session.request();
+
+    session.on('stream', common.mustCall(async (stream) => {
+      session.close();
+
+      const _err = new Error('kaboom');
+      stream.on('error', common.mustCall((err) => {
+        assert.strictEqual(err, _err);
+      }));
+      throw _err;
+    }));
+
+    req.end();
+  }));
+}