stream: prevent 'end' to be emitted after 'error'

This PR adds _readableState.errorEmitted and add the tracking of it.

Fixes: https://github.com/nodejs/node/issues/6083

PR-URL: https://github.com/nodejs/node/pull/20104
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/_stream_readable.js

@@ -99,6 +99,9 @@ function ReadableState(options, stream, isDuplex) {
   this.endEmitted = false;
   this.reading = false;
 
+  // Flipped if an 'error' is emitted.
+  this.errorEmitted = false;
+
   // a flag to be able to tell if the event 'readable'/'data' is emitted
   // immediately, or on a later tick.  We set this to true at first, because
   // any actions that shouldn't happen until "later" should generally also
@@ -1069,20 +1072,23 @@ function fromList(n, state) {
 function endReadable(stream) {
   var state = stream._readableState;
 
-  debug('endReadable', state.endEmitted);
+  debug('endReadable', state.endEmitted, state.errorEmitted);
-  if (!state.endEmitted) {
+  if (!state.endEmitted && !state.errorEmitted) {
     state.ended = true;
     process.nextTick(endReadableNT, state, stream);
   }
 }
 
 function endReadableNT(state, stream) {
-  debug('endReadableNT', state.endEmitted, state.length);
+  debug('endReadableNT', state.endEmitted, state.length, state.errorEmitted);
 
   // Check that we didn't get one last unshift.
   if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
     stream.readable = false;
-    stream.emit('end');
+
+    if (!state.errorEmitted) {
+      state.endEmitted = true;
+      stream.emit('end');
+    }
   }
 }

lib/_stream_writable.js

@@ -424,12 +424,22 @@ function onwriteError(stream, state, sync, er, cb) {
     // this can emit finish, and it will always happen
     // after error
     process.nextTick(finishMaybe, stream, state);
+
+    // needed for duplex, fixes https://github.com/nodejs/node/issues/6083
+    if (stream._readableState) {
+      stream._readableState.errorEmitted = true;
+    }
     stream._writableState.errorEmitted = true;
     stream.emit('error', er);
   } else {
     // the caller expect this to happen before if
     // it is async
     cb(er);
+
+    // needed for duplex, fixes https://github.com/nodejs/node/issues/6083
+    if (stream._readableState) {
+      stream._readableState.errorEmitted = true;
+    }
     stream._writableState.errorEmitted = true;
     stream.emit('error', er);
     // this can emit finish, but finish must

lib/internal/streams/destroy.js

@@ -8,10 +8,14 @@ function destroy(err, cb) {
     this._writableState.destroyed;
 
   if (readableDestroyed || writableDestroyed) {
+    const readableErrored = this._readableState &&
+      this._readableState.errorEmitted;
+    const writableErrored = this._writableState &&
+      this._writableState.errorEmitted;
+
     if (cb) {
       cb(err);
-    } else if (err &&
+    } else if (err && !readableErrored && !writableErrored) {
-               (!this._writableState || !this._writableState.errorEmitted)) {
       process.nextTick(emitErrorNT, this, err);
     }
     return this;
@@ -32,6 +36,11 @@ function destroy(err, cb) {
   this._destroy(err || null, (err) => {
     if (!cb && err) {
       process.nextTick(emitErrorAndCloseNT, this, err);
+
+      if (this._readableState) {
+        this._readableState.errorEmitted = true;
+      }
+
       if (this._writableState) {
         this._writableState.errorEmitted = true;
       }
@@ -65,6 +74,7 @@ function undestroy() {
     this._readableState.reading = false;
     this._readableState.ended = false;
     this._readableState.endEmitted = false;
+    this._readableState.errorEmitted = false;
   }
 
   if (this._writableState) {

test/parallel/test-http2-client-destroy.js

@@ -95,7 +95,6 @@ const Countdown = require('../common/countdown');
     });
 
     req.resume();
-    req.on('end', common.mustCall());
     req.on('close', common.mustCall(() => server.close()));
   }));
 }

test/parallel/test-http2-client-onconnect-errors.js

@@ -101,7 +101,6 @@ function runTest(test) {
     });
   }
 
-  req.on('end', common.mustCall());
   req.on('close', common.mustCall(() => {
     client.destroy();
 

test/parallel/test-http2-client-stream-destroy-before-connect.js

@@ -45,5 +45,4 @@ server.listen(0, common.mustCall(() => {
 
   req.on('response', common.mustNotCall());
   req.resume();
-  req.on('end', common.mustCall());
 }));

test/parallel/test-http2-compat-serverresponse-destroy.js

@@ -63,7 +63,6 @@ server.listen(0, common.mustCall(() => {
     req.on('close', common.mustCall(() => countdown.dec()));
 
     req.resume();
-    req.on('end', common.mustCall());
   }
 
   {
@@ -78,6 +77,5 @@ server.listen(0, common.mustCall(() => {
     req.on('close', common.mustCall(() => countdown.dec()));
 
     req.resume();
-    req.on('end', common.mustCall());
   }
 }));

test/parallel/test-http2-max-concurrent-streams.js

@@ -45,7 +45,6 @@ server.listen(0, common.mustCall(() => {
     req.on('aborted', common.mustCall());
     req.on('response', common.mustNotCall());
     req.resume();
-    req.on('end', common.mustCall());
     req.on('close', common.mustCall(() => countdown.dec()));
     req.on('error', common.expectsError({
       code: 'ERR_HTTP2_STREAM_ERROR',

test/parallel/test-http2-misused-pseudoheaders.js

@@ -41,7 +41,6 @@ server.listen(0, common.mustCall(() => {
 
   req.on('response', common.mustCall());
   req.resume();
-  req.on('end', common.mustCall());
   req.on('close', common.mustCall(() => {
     server.close();
     client.close();

test/parallel/test-http2-multi-content-length.js

@@ -53,7 +53,6 @@ server.listen(0, common.mustCall(() => {
     // header to be set for non-payload bearing requests...
     const req = client.request({ 'content-length': 1 });
     req.resume();
-    req.on('end', common.mustCall());
     req.on('close', common.mustCall(() => countdown.dec()));
     req.on('error', common.expectsError({
       code: 'ERR_HTTP2_STREAM_ERROR',

test/parallel/test-http2-respond-file-fd-invalid.js

@@ -40,7 +40,7 @@ server.listen(0, () => {
   req.on('response', common.mustCall());
   req.on('error', common.mustCall(errorCheck));
   req.on('data', common.mustNotCall());
-  req.on('end', common.mustCall(() => {
+  req.on('close', common.mustCall(() => {
     assert.strictEqual(req.rstCode, NGHTTP2_INTERNAL_ERROR);
     client.close();
     server.close();

test/parallel/test-http2-respond-nghttperrors.js

@@ -87,7 +87,7 @@ function runTest(test) {
   req.resume();
   req.end();
 
-  req.on('end', common.mustCall(() => {
+  req.on('close', common.mustCall(() => {
     client.close();
 
     if (!tests.length) {

test/parallel/test-http2-respond-with-fd-errors.js

@@ -95,7 +95,7 @@ function runTest(test) {
   req.resume();
   req.end();
 
-  req.on('end', common.mustCall(() => {
+  req.on('close', common.mustCall(() => {
     client.close();
 
     if (!tests.length) {

test/parallel/test-http2-server-shutdown-before-respond.js

@@ -32,5 +32,5 @@ server.on('listening', common.mustCall(() => {
   }));
   req.resume();
   req.on('data', common.mustNotCall());
-  req.on('end', common.mustCall(() => server.close()));
+  req.on('close', common.mustCall(() => server.close()));
 }));

test/parallel/test-http2-server-socket-destroy.js

@@ -52,5 +52,4 @@ server.on('listening', common.mustCall(() => {
 
   req.on('aborted', common.mustCall());
   req.resume();
-  req.on('end', common.mustCall());
 }));

test/parallel/test-stream-duplex-error-write.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const common = require('../common');
+const { Duplex } = require('stream');
+const { strictEqual } = require('assert');
+
+const duplex = new Duplex({
+  write(chunk, enc, cb) {
+    cb(new Error('kaboom'));
+  },
+  read() {
+    this.push(null);
+  }
+});
+
+duplex.on('error', common.mustCall(function() {
+  strictEqual(this._readableState.errorEmitted, true);
+  strictEqual(this._writableState.errorEmitted, true);
+}));
+
+duplex.on('end', common.mustNotCall());
+
+duplex.end('hello');
+duplex.resume();

test/parallel/test-stream-readable-destroy.js

@@ -189,3 +189,18 @@ const { inherits } = require('util');
   read.push('hi');
   read.on('data', common.mustNotCall());
 }
+
+{
+  // double error case
+  const read = new Readable({
+    read() {}
+  });
+
+  read.on('close', common.mustCall());
+  read.on('error', common.mustCall());
+
+  read.destroy(new Error('kaboom 1'));
+  read.destroy(new Error('kaboom 2'));
+  assert.strictEqual(read._readableState.errorEmitted, true);
+  assert.strictEqual(read.destroyed, true);
+}