[GCM] Add heartbeat manager and reconnection logic due to heartbeat failure

google_apis/gcm/engine/heartbeat_manager_unittest.cc

+// Copyright 2013 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 "google_apis/gcm/engine/heartbeat_manager.h"
+
+#include "base/message_loop/message_loop.h"
+#include "base/time/time.h"
+#include "google_apis/gcm/protocol/mcs.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace gcm {
+
+namespace {
+
+mcs_proto::HeartbeatConfig BuildHeartbeatConfig(int interval_ms) {
+  mcs_proto::HeartbeatConfig config;
+  config.set_interval_ms(interval_ms);
+  return config;
+}
+
+class TestHeartbeatManager : public HeartbeatManager {
+ public:
+  TestHeartbeatManager() {}
+  virtual ~TestHeartbeatManager() {}
+
+  // Bypass the heartbeat timer, and send the heartbeat now.
+  void TriggerHearbeat();
+};
+
+void TestHeartbeatManager::TriggerHearbeat() {
+  OnHeartbeatTriggered();
+}
+
+class HeartbeatManagerTest : public testing::Test {
+ public:
+  HeartbeatManagerTest();
+  virtual ~HeartbeatManagerTest() {}
+
+  TestHeartbeatManager* manager() { return manager_.get(); }
+  int heartbeats_sent() { return heartbeats_sent_; }
+  int reconnects_triggered() { return reconnects_triggered_; }
+
+  // Starts the heartbeat manager.
+  void StartManager();
+
+ private:
+  // Helper functions for verifying heartbeat manager effects.
+  void SendHeartbeatClosure();
+  void TriggerReconnectClosure();
+
+  scoped_ptr<TestHeartbeatManager> manager_;
+
+  int heartbeats_sent_;
+  int reconnects_triggered_;
+
+  base::MessageLoop message_loop_;
+};
+
+HeartbeatManagerTest::HeartbeatManagerTest()
+    : manager_(new TestHeartbeatManager()),
+      heartbeats_sent_(0),
+      reconnects_triggered_(0) {
+}
+
+void HeartbeatManagerTest::StartManager() {
+  manager_->Start(base::Bind(&HeartbeatManagerTest::SendHeartbeatClosure,
+                             base::Unretained(this)),
+                  base::Bind(&HeartbeatManagerTest::TriggerReconnectClosure,
+                             base::Unretained(this)));
+}
+
+void HeartbeatManagerTest::SendHeartbeatClosure() {
+  heartbeats_sent_++;
+}
+
+void HeartbeatManagerTest::TriggerReconnectClosure() {
+  reconnects_triggered_++;
+}
+
+// Basic initialization. No heartbeat should be pending.
+TEST_F(HeartbeatManagerTest, Init) {
+  EXPECT_TRUE(manager()->GetNextHeartbeatTime().is_null());
+}
+
+// Acknowledging a heartbeat before starting the manager should have no effect.
+TEST_F(HeartbeatManagerTest, AckBeforeStart) {
+  manager()->OnHeartbeatAcked();
+  EXPECT_TRUE(manager()->GetNextHeartbeatTime().is_null());
+}
+
+// Starting the manager should start the heartbeat timer.
+TEST_F(HeartbeatManagerTest, Start) {
+  StartManager();
+  EXPECT_GT(manager()->GetNextHeartbeatTime(), base::TimeTicks::Now());
+  EXPECT_EQ(0, heartbeats_sent());
+  EXPECT_EQ(0, reconnects_triggered());
+}
+
+// Acking the heartbeat should trigger a new heartbeat timer.
+TEST_F(HeartbeatManagerTest, AckedHeartbeat) {
+  StartManager();
+  manager()->TriggerHearbeat();
+  base::TimeTicks heartbeat = manager()->GetNextHeartbeatTime();
+  EXPECT_GT(heartbeat, base::TimeTicks::Now());
+  EXPECT_EQ(1, heartbeats_sent());
+  EXPECT_EQ(0, reconnects_triggered());
+
+  manager()->OnHeartbeatAcked();
+  EXPECT_LT(heartbeat, manager()->GetNextHeartbeatTime());
+  EXPECT_EQ(1, heartbeats_sent());
+  EXPECT_EQ(0, reconnects_triggered());
+
+  manager()->TriggerHearbeat();
+  EXPECT_EQ(2, heartbeats_sent());
+  EXPECT_EQ(0, reconnects_triggered());
+}
+
+// Trigger a heartbeat when one was outstanding should reset the connection.
+TEST_F(HeartbeatManagerTest, UnackedHeartbeat) {
+  StartManager();
+  manager()->TriggerHearbeat();
+  EXPECT_EQ(1, heartbeats_sent());
+  EXPECT_EQ(0, reconnects_triggered());
+
+  manager()->TriggerHearbeat();
+  EXPECT_EQ(1, heartbeats_sent());
+  EXPECT_EQ(1, reconnects_triggered());
+}
+
+// Updating the heartbeat interval before starting should result in the new
+// interval being used at Start time.
+TEST_F(HeartbeatManagerTest, UpdateIntervalThenStart) {
+  const int kIntervalMs = 60 * 1000;  // 60 seconds.
+  manager()->UpdateHeartbeatConfig(BuildHeartbeatConfig(kIntervalMs));
+  EXPECT_TRUE(manager()->GetNextHeartbeatTime().is_null());
+  StartManager();
+  EXPECT_LE(manager()->GetNextHeartbeatTime() - base::TimeTicks::Now(),
+            base::TimeDelta::FromMilliseconds(kIntervalMs));
+}
+
+// Updating the heartbeat interval after starting should only use the new
+// interval on the next heartbeat.
+TEST_F(HeartbeatManagerTest, StartThenUpdateInterval) {
+  const int kIntervalMs = 60 * 1000;  // 60 seconds.
+  StartManager();
+  base::TimeTicks heartbeat = manager()->GetNextHeartbeatTime();
+  EXPECT_GT(heartbeat - base::TimeTicks::Now(),
+            base::TimeDelta::FromMilliseconds(kIntervalMs));
+
+  // Updating the interval should not affect an outstanding heartbeat.
+  manager()->UpdateHeartbeatConfig(BuildHeartbeatConfig(kIntervalMs));
+  EXPECT_EQ(heartbeat, manager()->GetNextHeartbeatTime());
+
+  // Triggering and acking the heartbeat should result in a heartbeat being
+  // posted with the new interval.
+  manager()->TriggerHearbeat();
+  manager()->OnHeartbeatAcked();
+
+  EXPECT_LE(manager()->GetNextHeartbeatTime() - base::TimeTicks::Now(),
+            base::TimeDelta::FromMilliseconds(kIntervalMs));
+  EXPECT_NE(heartbeat, manager()->GetNextHeartbeatTime());
+}
+
+// Stopping the manager should reset the heartbeat timer.
+TEST_F(HeartbeatManagerTest, Stop) {
+  StartManager();
+  EXPECT_GT(manager()->GetNextHeartbeatTime(), base::TimeTicks::Now());
+
+  manager()->Stop();
+  EXPECT_TRUE(manager()->GetNextHeartbeatTime().is_null());
+}
+
+}  // namespace
+
+}  // namespace gcm