Revert "stream: invoke callback before emitting error always"

This reverts commit 3de5eae.

PR-URL: #29741
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

doc/api/stream.md

@@ -571,8 +571,7 @@ The `writable.write()` method writes some data to the stream, and calls the
 supplied `callback` once the data has been fully handled. If an error
 occurs, the `callback` *may or may not* be called with the error as its
 first argument. To reliably detect write errors, add a listener for the
-`'error'` event. If `callback` is called with an error, it will be called
-before the `'error'` event is emitted.
+`'error'` event.
 
 The return value is `true` if the internal buffer is less than the
 `highWaterMark` configured when the stream was created after admitting `chunk`.

lib/_stream_writable.js

@@ -158,11 +158,6 @@ function WritableState(options, stream, isDuplex) {
   // Should .destroy() be called after 'finish' (and potentially 'end')
   this.autoDestroy = !!(options && options.autoDestroy);
 
-  // Indicates whether the stream has errored. When true all write() calls
-  // should return false. This is needed since when autoDestroy
-  // is disabled we need a way to tell whether the stream has failed.
-  this.errored = false;
-
   // Count buffered requests
   this.bufferedRequestCount = 0;
 
@@ -406,7 +401,7 @@ function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
   if (!ret)
     state.needDrain = true;
 
-  if (state.writing || state.corked || state.errored) {
+  if (state.writing || state.corked) {
     var last = state.lastBufferedRequest;
     state.lastBufferedRequest = {
       chunk,
@@ -425,9 +420,7 @@ function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
     doWrite(stream, state, false, len, chunk, encoding, cb);
   }
 
-  // Return false if errored or destroyed in order to break
-  // any synchronous while(stream.write(data)) loops.
-  return ret && !state.errored && !state.destroyed;
+  return ret;
 }
 
 function doWrite(stream, state, writev, len, chunk, encoding, cb) {
@@ -444,11 +437,18 @@ function doWrite(stream, state, writev, len, chunk, encoding, cb) {
   state.sync = false;
 }
 
-function onwriteError(stream, state, er, cb) {
+function onwriteError(stream, state, sync, er, cb) {
   --state.pendingcb;
 
-  cb(er);
-  // This can emit error, but error must always follow cb.
+  if (sync) {
+    // Defer the callback if we are being called synchronously
+    // to avoid piling up things on the stack
+    process.nextTick(cb, er);
+  } else {
+    // The caller expect this to happen before if
+    // it is async
+    cb(er);
+  }
   errorOrDestroy(stream, er);
 }
 
@@ -465,14 +465,9 @@ function onwrite(stream, er) {
   state.length -= state.writelen;
   state.writelen = 0;
 
-  if (er) {
-    state.errored = true;
-    if (sync) {
-      process.nextTick(onwriteError, stream, state, er, cb);
-    } else {
-      onwriteError(stream, state, er, cb);
-    }
-  } else {
+  if (er)
+    onwriteError(stream, state, sync, er, cb);
+  else {
     // Check if we're actually ready to finish, but don't emit yet
     var finished = needFinish(state) || stream.destroyed;
 
@@ -627,7 +622,7 @@ Object.defineProperty(Writable.prototype, 'writableLength', {
 function needFinish(state) {
   return (state.ending &&
           state.length === 0 &&
-          !state.errored &&
+          !state.errorEmitted &&
           state.bufferedRequest === null &&
           !state.finished &&
           !state.writing);

lib/internal/streams/destroy.js

@@ -27,10 +27,6 @@ function destroy(err, cb) {
   const r = this._readableState;
   const w = this._writableState;
 
-  if (w && err) {
-    w.errored = true;
-  }
-
   if ((w && w.destroyed) || (r && r.destroyed)) {
     if (cb) {
       cb(err);
@@ -54,12 +50,10 @@ function destroy(err, cb) {
   this._destroy(err || null, (err) => {
     const emitClose = (w && w.emitClose) || (r && r.emitClose);
     if (cb) {
-      // Invoke callback before scheduling emitClose so that callback
-      // can schedule before.
-      cb(err);
       if (emitClose) {
         process.nextTick(emitCloseNT, this);
       }
+      cb(err);
     } else if (needError(this, err)) {
       process.nextTick(emitClose ? emitErrorCloseNT : emitErrorNT, this, err);
     } else if (emitClose) {
@@ -97,7 +91,6 @@ function undestroy() {
 
   if (w) {
     w.destroyed = false;
-    w.errored = false;
     w.ended = false;
     w.ending = false;
     w.finalCalled = false;
@@ -117,10 +110,6 @@ function errorOrDestroy(stream, err) {
   const r = stream._readableState;
   const w = stream._writableState;
 
-  if (w & err) {
-    w.errored = true;
-  }
-
   if ((r && r.autoDestroy) || (w && w.autoDestroy))
     stream.destroy(err);
   else if (needError(stream, err))

test/parallel/test-http2-reset-flood.js

@@ -67,10 +67,7 @@ const worker = new Worker(__filename).on('message', common.mustCall((port) => {
       h2header.writeIntBE(1, 0, 3);  // Length: 1
       h2header.writeIntBE(i, 5, 4);  // Stream ID
       // 0x88 = :status: 200
-      if (!conn.write(Buffer.concat([h2header, Buffer.from([0x88])]))) {
-        process.nextTick(writeRequests);
-        break;
-      }
+      conn.write(Buffer.concat([h2header, Buffer.from([0x88])]));
     }
   }
 

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

@@ -16,20 +16,6 @@ const assert = require('assert');
   assert.strictEqual(write.destroyed, true);
 }
 
-{
-  const write = new Writable({
-    write(chunk, enc, cb) {
-      this.destroy(new Error('asd'));
-      cb();
-    }
-  });
-
-  write.on('error', common.mustCall());
-  write.on('finish', common.mustNotCall());
-  write.end('asd');
-  assert.strictEqual(write.destroyed, true);
-}
-
 {
   const write = new Writable({
     write(chunk, enc, cb) { cb(); }

test/parallel/test-wrap-js-stream-exceptions.js

@@ -16,8 +16,4 @@ const socket = new JSStreamWrap(new Duplex({
   })
 }));
 
-socket.end('foo');
-socket.on('error', common.expectsError({
-  type: Error,
-  message: 'write EPROTO'
-}));
+assert.throws(() => socket.end('foo'), /Error: write EPROTO/);

test/parallel/test-zlib-write-after-close.js

@@ -26,10 +26,12 @@ const zlib = require('zlib');
 zlib.gzip('hello', common.mustCall(function(err, out) {
   const unzip = zlib.createGunzip();
   unzip.close(common.mustCall());
-
-  unzip.write(out);
-  unzip.on('error', common.expectsError({
-    code: 'ERR_STREAM_DESTROYED',
-    type: Error
-  }));
+  common.expectsError(
+    () => unzip.write(out),
+    {
+      code: 'ERR_STREAM_DESTROYED',
+      type: Error,
+      message: 'Cannot call write after a stream was destroyed'
+    }
+  );
 }));