stream: do not emit after 'error'

Do not emit 'prefinish' or 'finish' event after an error.

PR-URL: #28708
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>

Author: ronag

lib/_stream_writable.js

@@ -617,10 +617,11 @@ function callFinal(stream, state) {
     state.pendingcb--;
     if (err) {
       errorOrDestroy(stream, err);
+    } else {
+      state.prefinished = true;
+      stream.emit('prefinish');
+      finishMaybe(stream, state);
     }
-    state.prefinished = true;
-    stream.emit('prefinish');
-    finishMaybe(stream, state);
   });
 }
 function prefinish(stream, state) {

test/parallel/test-stream2-writable.js

@@ -441,3 +441,20 @@ const helloWorldBuffer = Buffer.from('hello world');
   w.write('hello');
   w.destroy(new Error());
 }
+
+{
+  // Verify that finish is not emitted after error
+  const w = new W();
+
+  w._final = common.mustCall(function(cb) {
+    cb(new Error());
+  });
+  w._write = function(chunk, e, cb) {
+    process.nextTick(cb);
+  };
+  w.on('error', common.mustCall());
+  w.on('prefinish', common.mustNotCall());
+  w.on('finish', common.mustNotCall());
+  w.write(Buffer.allocUnsafe(1));
+  w.end(Buffer.allocUnsafe(0));
+}