stream: do not flush destroyed writable

It doesn't make much sense to flush a stream which has been destroyed.

PR-URL: #29028
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: ronag

lib/_stream_writable.js

@@ -299,9 +299,13 @@ Writable.prototype.write = function(chunk, encoding, cb) {
   if (typeof cb !== 'function')
     cb = nop;
 
-  if (state.ending)
+  if (state.ending) {
     writeAfterEnd(this, cb);
-  else if (isBuf || validChunk(this, state, chunk, cb)) {
+  } else if (state.destroyed) {
+    const err = new ERR_STREAM_DESTROYED('write');
+    process.nextTick(cb, err);
+    errorOrDestroy(this, err);
+  } else if (isBuf || validChunk(this, state, chunk, cb)) {
     state.pendingcb++;
     ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
   }
@@ -733,7 +737,21 @@ Object.defineProperty(Writable.prototype, 'writableFinished', {
   }
 });
 
-Writable.prototype.destroy = destroyImpl.destroy;
+const destroy = destroyImpl.destroy;
+Writable.prototype.destroy = function(err, cb) {
+  const state = this._writableState;
+  if (!state.destroyed) {
+    for (let entry = state.bufferedRequest; entry; entry = entry.next) {
+      process.nextTick(entry.callback, new ERR_STREAM_DESTROYED('write'));
+    }
+    state.bufferedRequest = null;
+    state.lastBufferedRequest = null;
+    state.bufferedRequestCount = 0;
+  }
+  destroy.call(this, err, cb);
+  return this;
+};
+
 Writable.prototype._undestroy = destroyImpl.undestroy;
 Writable.prototype._destroy = function(err, cb) {
   cb(err);

test/parallel/test-http2-server-stream-session-destroy.js

@@ -39,7 +39,11 @@ server.on('stream', common.mustCall((stream) => {
     code: 'ERR_STREAM_WRITE_AFTER_END',
     message: 'write after end'
   }));
-  assert.strictEqual(stream.write('data'), false);
+  assert.strictEqual(stream.write('data', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_WRITE_AFTER_END',
+    message: 'write after end'
+  })), false);
 }));
 
 server.listen(0, common.mustCall(() => {

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

@@ -232,3 +232,49 @@ const assert = require('assert');
   write._undestroy();
   write.end();
 }
+
+{
+  const write = new Writable();
+
+  write.destroy();
+  write.on('error', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_DESTROYED',
+    message: 'Cannot call write after a stream was destroyed'
+  }));
+  write.write('asd', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_DESTROYED',
+    message: 'Cannot call write after a stream was destroyed'
+  }));
+}
+
+{
+  const write = new Writable({
+    write(chunk, enc, cb) { cb(); }
+  });
+
+  write.on('error', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_DESTROYED',
+    message: 'Cannot call write after a stream was destroyed'
+  }));
+
+  write.cork();
+  write.write('asd', common.mustCall());
+  write.uncork();
+
+  write.cork();
+  write.write('asd', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_DESTROYED',
+    message: 'Cannot call write after a stream was destroyed'
+  }));
+  write.destroy();
+  write.write('asd', common.expectsError({
+    type: Error,
+    code: 'ERR_STREAM_DESTROYED',
+    message: 'Cannot call write after a stream was destroyed'
+  }));
+  write.uncork();
+}

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

@@ -24,7 +24,16 @@ for (const withPendingData of [ false, true ]) {
     w.on('drain', () => drains++);
     w.on('finish', () => finished = true);
 
-    w.write('abc', () => chunksWritten++);
+    function onWrite(err) {
+      if (err) {
+        assert.strictEqual(w.destroyed, true);
+        assert.strictEqual(err.code, 'ERR_STREAM_DESTROYED');
+      } else {
+        chunksWritten++;
+      }
+    }
+
+    w.write('abc', onWrite);
     assert.strictEqual(chunksWritten, 0);
     assert.strictEqual(drains, 0);
     callbacks.shift()();
@@ -34,14 +43,14 @@ for (const withPendingData of [ false, true ]) {
     if (withPendingData) {
       // Test 2 cases: There either is or is not data still in the write queue.
       // (The second write will never actually get executed either way.)
-      w.write('def', () => chunksWritten++);
+      w.write('def', onWrite);
     }
     if (useEnd) {
       // Again, test 2 cases: Either we indicate that we want to end the
       // writable or not.
-      w.end('ghi', () => chunksWritten++);
+      w.end('ghi', onWrite);
     } else {
-      w.write('ghi', () => chunksWritten++);
+      w.write('ghi', onWrite);
     }
 
     assert.strictEqual(chunksWritten, 1);