Merge pull request #773 from lucas-clemente/fix-772

return an error when Write is called on a closed stream

stream.go

@@ -180,6 +180,9 @@ func (s *stream) Write(p []byte) (int, error) {
 	if s.resetLocally.Get() || s.err != nil {
 		return 0, s.err
 	}
+	if s.finishedWriting.Get() {
+		return 0, fmt.Errorf("write on closed stream %d", s.streamID)
+	}
 	if len(p) == 0 {
 		return 0, nil
 	}

stream_test.go

@@ -865,6 +865,12 @@ var _ = Describe("Stream", func() {
 				Expect(str.finishedWriting.Get()).To(BeTrue())
 			})
 
+			It("doesn't allow writes after it has been closed", func() {
+				str.Close()
+				_, err := strWithTimeout.Write([]byte("foobar"))
+				Expect(err).To(MatchError("write on closed stream 1337"))
+			})
+
 			It("allows FIN", func() {
 				str.Close()
 				Expect(str.shouldSendFin()).To(BeTrue())