Process incoming IQs in the same order that they were sent.

remoting/protocol/ordered_message_queue_unittest.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/protocol/ordered_message_queue.h"
+
+#include "base/test/gtest_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
+#include "third_party/webrtc/libjingle/xmpp/constants.h"
+
+using buzz::XmlElement;
+
+namespace remoting {
+
+namespace {
+
+std::unique_ptr<XmlElement> CreateIq(std::string type, std::string id) {
+  std::unique_ptr<XmlElement> iq(
+      XmlElement::ForStr("<iq from='from@gmail.com' to='to@gmail.com'></iq>"));
+  iq->AddAttr(buzz::QN_ID, id);
+  iq->AddAttr(buzz::QN_TYPE, type);
+  return iq;
+}
+
+void AssertIqEquals(std::list<std::string> expected_ids,
+                    std::list<std::unique_ptr<XmlElement>> iqs) {
+  ASSERT_EQ(expected_ids.size(), iqs.size());
+  auto iq_it = iqs.begin();
+  for (auto id_it = expected_ids.begin(); iq_it != iqs.end();
+       ++iq_it, ++id_it) {
+    std::unique_ptr<XmlElement> stanza = std::move(*iq_it);
+    ASSERT_EQ(*id_it, stanza->Attr(buzz::QN_ID));
+  }
+}
+
+}  // namespace
+
+TEST(OrderedMessageQueueTest, OutOfOrderMessages1) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("xyz_1", CreateIq("set", "xyz_1"));
+  AssertIqEquals({"xyz_1"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_4", CreateIq("set", "xyz_4"));
+  ASSERT_EQ(0u, received.size());
+  received = queue.OnIncomingMessage("xyz_3", CreateIq("set", "xyz_3"));
+  ASSERT_EQ(0u, received.size());
+  received = queue.OnIncomingMessage("xyz_2", CreateIq("set", "xyz_2"));
+  AssertIqEquals({"xyz_2", "xyz_3", "xyz_4"}, std::move(received));
+}
+
+TEST(OrderedMessageQueueTest, OutOfOrderMessages2) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("xyz_1", CreateIq("set", "xyz_1"));
+  AssertIqEquals({"xyz_1"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_4", CreateIq("set", "xyz_4"));
+  ASSERT_EQ(0u, received.size());
+  received = queue.OnIncomingMessage("xyz_2", CreateIq("set", "xyz_2"));
+  AssertIqEquals({"xyz_2"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_3", CreateIq("set", "xyz_3"));
+  AssertIqEquals({"xyz_3", "xyz_4"}, std::move(received));
+}
+
+TEST(OrderedMessageQueueTest, DuplicateMessageId1) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("xyz_1", CreateIq("set", "xyz_1"));
+  AssertIqEquals({"xyz_1"}, std::move(received));
+  ASSERT_DCHECK_DEATH(
+      queue.OnIncomingMessage("xyz_1", CreateIq("set", "xyz_1")));
+}
+
+TEST(OrderedMessageQueueTest, DuplicateMessageId2) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("xyz_1", CreateIq("get", "xyz_1"));
+  AssertIqEquals({"xyz_1"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_4", CreateIq("get", "xyz_4"));
+  ASSERT_EQ(0u, received.size());
+  received = queue.OnIncomingMessage("xyz_3", CreateIq("get", "xyz_3"));
+  ASSERT_EQ(0u, received.size());
+  ASSERT_DCHECK_DEATH(
+      queue.OnIncomingMessage("xyz_3", CreateIq("get", "xyz_3")));
+}
+
+TEST(OrderedMessageQueueTest, InOrderMessages) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("xyz_1", CreateIq("set", "xyz_1"));
+  AssertIqEquals({"xyz_1"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_2", CreateIq("set", "xyz_2"));
+  AssertIqEquals({"xyz_2"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_3", CreateIq("set", "xyz_3"));
+  AssertIqEquals({"xyz_3"}, std::move(received));
+  received = queue.OnIncomingMessage("xyz_4", CreateIq("set", "xyz_4"));
+  AssertIqEquals({"xyz_4"}, std::move(received));
+}
+
+TEST(OrderedMessageQueueTest, LegacyMessages) {
+  OrderedMessageQueue<std::unique_ptr<XmlElement>> queue;
+  std::list<std::unique_ptr<XmlElement>> received;
+  received = queue.OnIncomingMessage("1004", CreateIq("set", "1004"));
+  AssertIqEquals({"1004"}, std::move(received));
+  received = queue.OnIncomingMessage("1002", CreateIq("set", "1002"));
+  AssertIqEquals({"1002"}, std::move(received));
+  received = queue.OnIncomingMessage("1003", CreateIq("set", "1003"));
+  AssertIqEquals({"1003"}, std::move(received));
+  received = queue.OnIncomingMessage("1001", CreateIq("set", "1001"));
+  AssertIqEquals({"1001"}, std::move(received));
+}
+
+}  // namespace remoting