Fix and refactor HttpServerPropertiesImpl's alternative services brokenness expiration behavior

net/http/broken_alternative_services_unittest.cc

+// Copyright (c) 2017 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 "net/http/broken_alternative_services.h"
+
+#include <algorithm>
+#include <vector>
+
+#include "base/test/test_mock_time_task_runner.h"
+#include "base/time/tick_clock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+const base::TimeDelta BROKEN_ALT_SVC_EXPIRE_DELAYS[10] = {
+    base::TimeDelta::FromMinutes(5),    base::TimeDelta::FromMinutes(10),
+    base::TimeDelta::FromMinutes(20),   base::TimeDelta::FromMinutes(40),
+    base::TimeDelta::FromMinutes(80),   base::TimeDelta::FromMinutes(160),
+    base::TimeDelta::FromMinutes(320),  base::TimeDelta::FromMinutes(640),
+    base::TimeDelta::FromMinutes(1280), base::TimeDelta::FromMinutes(2560)};
+
+class BrokenAlternativeServicesTest
+    : public BrokenAlternativeServices::Delegate,
+      public ::testing::Test {
+ public:
+  BrokenAlternativeServicesTest()
+      : test_task_runner_(new base::TestMockTimeTaskRunner()),
+        test_task_runner_context_(test_task_runner_),
+        broken_services_clock_(test_task_runner_->GetMockTickClock()),
+        broken_services_(this, broken_services_clock_.get()) {}
+
+  // BrokenAlternativeServices::Delegate implementation
+  void OnExpireBrokenAlternativeService(
+      const AlternativeService& expired_alternative_service) override {
+    expired_alt_svcs_.push_back(expired_alternative_service);
+  }
+
+  // All tests will run inside the scope of |test_task_runner_context_|, which
+  // means any task posted to the main message loop will run on
+  // |test_task_runner_|.

[Ryan Hamilton, 2017/05/30 21:32:28]

nice comment!

[wangyix1, 2017/05/30 23:57:49]

Acknowledged.

+  scoped_refptr<base::TestMockTimeTaskRunner> test_task_runner_;
+  base::TestMockTimeTaskRunner::ScopedContext test_task_runner_context_;
+
+  std::unique_ptr<base::TickClock> broken_services_clock_;
+  BrokenAlternativeServices broken_services_;
+
+  std::vector<AlternativeService> expired_alt_svcs_;
+};
+
+TEST_F(BrokenAlternativeServicesTest, MarkBroken) {
+  const AlternativeService alternative_service1(kProtoHTTP2, "foo", 443);
+  const AlternativeService alternative_service2(kProtoHTTP2, "foo", 1234);
+
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  broken_services_.MarkAlternativeServiceBroken(alternative_service1);
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  broken_services_.MarkAlternativeServiceBroken(alternative_service2);
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  broken_services_.ConfirmAlternativeService(alternative_service1);
+
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  broken_services_.ConfirmAlternativeService(alternative_service2);
+
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  EXPECT_EQ(0u, expired_alt_svcs_.size());
+}
+
+TEST_F(BrokenAlternativeServicesTest, MarkRecentlyBroken) {
+  const AlternativeService alternative_service(kProtoHTTP2, "foo", 443);
+
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service));
+  EXPECT_FALSE(broken_services_.WasAlternativeServiceRecentlyBroken(
+      alternative_service));
+
+  broken_services_.MarkAlternativeServiceRecentlyBroken(alternative_service);
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service));
+  EXPECT_TRUE(broken_services_.WasAlternativeServiceRecentlyBroken(
+      alternative_service));
+
+  broken_services_.ConfirmAlternativeService(alternative_service);
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service));
+  EXPECT_FALSE(broken_services_.WasAlternativeServiceRecentlyBroken(
+      alternative_service));
+}
+
+TEST_F(BrokenAlternativeServicesTest, ExpireBrokenAlternateProtocolMappings) {
+  AlternativeService alternative_service(kProtoQUIC, "foo", 443);
+
+  broken_services_.MarkAlternativeServiceBroken(alternative_service);
+
+  // |broken_services_| should have posted task to expire the brokenness of
+  // |alternative_service|.
+  EXPECT_EQ(1u, test_task_runner_->GetPendingTaskCount());
+
+  // Advance time until one time quantum before |alternative_service1|'s
+  // brokenness expires
+  test_task_runner_->FastForwardBy(base::TimeDelta::FromMinutes(5) -
+                                   base::TimeDelta::FromInternalValue(1));
+
+  // Ensure |alternative_service| is still marked broken.
+  EXPECT_TRUE(broken_services_.IsAlternativeServiceBroken(alternative_service));
+  EXPECT_EQ(0u, expired_alt_svcs_.size());
+  EXPECT_EQ(1u, test_task_runner_->GetPendingTaskCount());
+
+  // Advance time by one time quantum
+  test_task_runner_->FastForwardBy(base::TimeDelta::FromInternalValue(1));
+
+  // Ensure |alternative_service| brokenness has expired but is still
+  // considered recently broken
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service));
+  EXPECT_FALSE(test_task_runner_->HasPendingTask());
+  EXPECT_EQ(1u, expired_alt_svcs_.size());
+  EXPECT_EQ(alternative_service, expired_alt_svcs_[0]);
+  EXPECT_TRUE(broken_services_.WasAlternativeServiceRecentlyBroken(
+      alternative_service));
+}
+
+TEST_F(BrokenAlternativeServicesTest, ExponentialBackoff) {
+  // Tests the exponential backoff of the computed expiration delay when an
+  // alt svc is marked broken. After being marked broken 10 times, the max
+  // expiration delay will have been reached and exponential backoff will no
+  // longer apply.
+
+  AlternativeService alternative_service(kProtoQUIC, "foo", 443);
+
+  for (int i = 0; i < 11; ++i) {
+    broken_services_.MarkAlternativeServiceBroken(alternative_service);
+
+    // Advance time until one time quantum before |alternative_service1|'s
+    // brokenness expires
+    test_task_runner_->FastForwardBy(
+        BROKEN_ALT_SVC_EXPIRE_DELAYS[std::min(i, 9)] -
+        base::TimeDelta::FromInternalValue(1));
+
+    EXPECT_TRUE(
+        broken_services_.IsAlternativeServiceBroken(alternative_service));
+
+    // Advance time by one time quantum. |alternative_service| should no longer
+    // be broken.
+    test_task_runner_->FastForwardBy(base::TimeDelta::FromInternalValue(1));
+
+    EXPECT_FALSE(
+        broken_services_.IsAlternativeServiceBroken(alternative_service));
+  }
+}
+
+TEST_F(BrokenAlternativeServicesTest, RemoveExpiredBrokenAltSvc) {
+  // This test will mark broken an alternative service A that has already been
+  // marked broken many times, then immediately mark another alternative service
+  // B as broken for the first time. Because A's been marked broken many times
+  // already, its brokenness will be scheduled to expire much further in the
+  // future than B, even though it was marked broken before B. This test makes
+  // sure that even though A was marked broken before B, B's brokenness should
+  // expire before A.
+
+  AlternativeService alternative_service1(kProtoQUIC, "foo", 443);
+  AlternativeService alternative_service2(kProtoQUIC, "bar", 443);
+
+  // Repeately mark |alternative_service1| broken and let brokenness expire.
+  // Do this a few times.
+  for (int i = 0; i < 3; ++i) {
+    broken_services_.MarkAlternativeServiceBroken(alternative_service1);
+
+    // |broken_services_| should have posted task to expire the brokenness of
+    // |alternative_service|.
+    EXPECT_EQ(1u, test_task_runner_->GetPendingTaskCount());
+
+    // Advance time by just enough so that |alternative_service|'s brokenness
+    // expires.
+    test_task_runner_->FastForwardBy(BROKEN_ALT_SVC_EXPIRE_DELAYS[i]);
+
+    // Ensure |broken_services_| notifies the delegate of expired broken alt
+    // svcs.
+    EXPECT_EQ(i + 1, (int)expired_alt_svcs_.size());
+    EXPECT_EQ(alternative_service1, expired_alt_svcs_[i]);
+  }
+  expired_alt_svcs_.clear();
+
+  // Mark |alternative_service1| broken (will be given longer expiration delay),
+  // then mark |alternative_service2| broken (will be given shorter expiration
+  // delay).
+  broken_services_.MarkAlternativeServiceBroken(alternative_service1);
+  broken_services_.MarkAlternativeServiceBroken(alternative_service2);
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+
+  // Advance time until one time quantum before |alternative_service2|'s
+  // brokenness expires.
+  test_task_runner_->FastForwardBy(BROKEN_ALT_SVC_EXPIRE_DELAYS[0] -
+                                   base::TimeDelta::FromInternalValue(1));
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+  EXPECT_EQ(0u, expired_alt_svcs_.size());
+
+  // Advance time by one time quantum. |alternative_service2| should no longer
+  // be broken.
+  test_task_runner_->FastForwardBy(base::TimeDelta::FromInternalValue(1));
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+  EXPECT_EQ(1u, expired_alt_svcs_.size());
+  EXPECT_EQ(alternative_service2, expired_alt_svcs_[0]);
+
+  // Advance time until one time quantum before |alternative_service1|'s
+  // brokenness expires
+  test_task_runner_->FastForwardBy(BROKEN_ALT_SVC_EXPIRE_DELAYS[3] -
+                                   BROKEN_ALT_SVC_EXPIRE_DELAYS[0] -
+                                   base::TimeDelta::FromInternalValue(1));
+
+  EXPECT_TRUE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+  EXPECT_EQ(1u, expired_alt_svcs_.size());
+  EXPECT_EQ(alternative_service2, expired_alt_svcs_[0]);
+
+  // Advance time by one time quantum.  |alternative_service1| should no longer
+  // be broken.
+  test_task_runner_->FastForwardBy(base::TimeDelta::FromInternalValue(1));
+
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service1));
+  EXPECT_FALSE(
+      broken_services_.IsAlternativeServiceBroken(alternative_service2));
+  EXPECT_EQ(2u, expired_alt_svcs_.size());
+  EXPECT_EQ(alternative_service2, expired_alt_svcs_[0]);
+  EXPECT_EQ(alternative_service1, expired_alt_svcs_[1]);
+}
+
+}  // namespace
+
+}  // namespace net