text: // Copyright 2014 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/disk_cache_based_quic_server_info.h"
  
  #include "base/bind.h"
  #include "base/bind_helpers.h"
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "base/memory/ptr_util.h"
  #include "base/run_loop.h"
  #include "net/base/net_errors.h"
  #include "net/http/mock_http_cache.h"
  #include "net/quic/chromium/quic_server_info.h"
  #include "net/quic/core/quic_server_id.h"
  #include "net/test/gtest_util.h"
  #include "testing/gmock/include/gmock/gmock.h"
  #include "testing/gtest/include/gtest/gtest.h"
  
  using net::test::IsError;
  using net::test::IsOk;
  
  using std::string;
  
  namespace net {
  namespace {
  
  // This is an empty transaction, needed to register the URL and the test mode.
  const MockTransaction kHostInfoTransaction1 = {
      "quicserverinfo:https://www.google.com:443",
      "",
      base::Time(),
      "",
      LOAD_NORMAL,
      "",
      "",
      base::Time(),
      "",
      TEST_MODE_NORMAL,
      nullptr,
      nullptr,
      nullptr,
      0,
      0,
      OK,
  };
  
  const MockTransaction kHostInfoTransaction2 = {
      "quicserverinfo:https://www.google.com:80",
      "",
      base::Time(),
      "",
      LOAD_NORMAL,
      "",
      "",
      base::Time(),
      "",
      TEST_MODE_NORMAL,
      nullptr,
      nullptr,
      nullptr,
      0,
      0,
      OK,
  };
  
  class DeleteCacheCompletionCallback : public TestCompletionCallbackBase {
   public:
    explicit DeleteCacheCompletionCallback(QuicServerInfo* server_info)
        : server_info_(server_info),
          callback_(base::Bind(&DeleteCacheCompletionCallback::OnComplete,
                               base::Unretained(this))) {}
  
    const CompletionCallback& callback() const { return callback_; }
  
   private:
    void OnComplete(int result) {
      delete server_info_;
      SetResult(result);
    }
  
    QuicServerInfo* server_info_;
    CompletionCallback callback_;
  
    DISALLOW_COPY_AND_ASSIGN(DeleteCacheCompletionCallback);
  };
  
  }  // namespace
  
  // Tests that we can delete a DiskCacheBasedQuicServerInfo object in a
  // completion callback for DiskCacheBasedQuicServerInfo::WaitForDataReady.
  TEST(DiskCacheBasedQuicServerInfo, DeleteInCallback) {
    // Use the blocking mock backend factory to force asynchronous completion
    // of quic_server_info->WaitForDataReady(), so that the callback will run.
    MockBlockingBackendFactory* factory = new MockBlockingBackendFactory();
    MockHttpCache cache(base::WrapUnique(factory));
    QuicServerId server_id("www.verisign.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    TestCompletionCallback callback;
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
    // Now complete the backend creation and let the callback run.
    factory->FinishCreation();
    EXPECT_THAT(callback.GetResult(rv), IsOk());
  }
  
  // Tests the basic logic of storing, retrieving and updating data.
  TEST(DiskCacheBasedQuicServerInfo, Update) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
  
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
    const string cert_b = "cert_b";
  
    state->server_config = server_config_a;
    state->source_address_token = source_address_token_a;
    state->cert_sct = cert_sct_a;
    state->chlo_hash = chlo_hash_a;
    state->server_config_sig = server_config_sig_a;
    state->certs.push_back(cert_a);
    quic_server_info->Persist();
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    // Open the stored QuicServerInfo.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
  
    // And now update the data.
    state = quic_server_info->mutable_state();
    state->certs.push_back(cert_b);
  
    // Fail instead of DCHECKing double creates.
    cache.disk_cache()->set_double_create_check(false);
    quic_server_info->Persist();
    base::RunLoop().RunUntilIdle();
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_a, state1.server_config);
    EXPECT_EQ(source_address_token_a, state1.source_address_token);
    EXPECT_EQ(cert_sct_a, state1.cert_sct);
    EXPECT_EQ(chlo_hash_a, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state1.server_config_sig);
    EXPECT_EQ(2U, state1.certs.size());
    EXPECT_EQ(cert_a, state1.certs[0]);
    EXPECT_EQ(cert_b, state1.certs[1]);
  
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // Test that demonstrates different info is returned when the ports differ.
  TEST(DiskCacheBasedQuicServerInfo, UpdateDifferentPorts) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    AddMockTransaction(&kHostInfoTransaction2);
    TestCompletionCallback callback;
  
    // Persist data for port 443.
    QuicServerId server_id1("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info1(
        new DiskCacheBasedQuicServerInfo(server_id1, cache.http_cache()));
    quic_server_info1->Start();
    int rv = quic_server_info1->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
  
    QuicServerInfo::State* state1 = quic_server_info1->mutable_state();
    EXPECT_TRUE(state1->certs.empty());
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
  
    state1->server_config = server_config_a;
    state1->source_address_token = source_address_token_a;
    state1->cert_sct = cert_sct_a;
    state1->chlo_hash = chlo_hash_a;
    state1->server_config_sig = server_config_sig_a;
    state1->certs.push_back(cert_a);
    quic_server_info1->Persist();
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    // Persist data for port 80.
    QuicServerId server_id2("www.google.com", 80, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info2(
        new DiskCacheBasedQuicServerInfo(server_id2, cache.http_cache()));
    quic_server_info2->Start();
    rv = quic_server_info2->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
  
    QuicServerInfo::State* state2 = quic_server_info2->mutable_state();
    EXPECT_TRUE(state2->certs.empty());
    const string server_config_b = "server_config_b";
    const string source_address_token_b = "source_address_token_b";
    const string cert_sct_b = "cert_sct_b";
    const string chlo_hash_b = "chlo_hash_b";
    const string server_config_sig_b = "server_config_sig_b";
    const string cert_b = "cert_b";
  
    state2->server_config = server_config_b;
    state2->source_address_token = source_address_token_b;
    state2->cert_sct = cert_sct_b;
    state2->chlo_hash = chlo_hash_b;
    state2->server_config_sig = server_config_sig_b;
    state2->certs.push_back(cert_b);
    quic_server_info2->Persist();
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    // Verify the stored QuicServerInfo for port 443.
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id1, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state_a = quic_server_info->state();
    EXPECT_EQ(server_config_a, state_a.server_config);
    EXPECT_EQ(source_address_token_a, state_a.source_address_token);
    EXPECT_EQ(cert_sct_a, state_a.cert_sct);
    EXPECT_EQ(chlo_hash_a, state_a.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state_a.server_config_sig);
    EXPECT_EQ(1U, state_a.certs.size());
    EXPECT_EQ(cert_a, state_a.certs[0]);
  
    // Verify the stored QuicServerInfo for port 80.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id2, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state_b = quic_server_info->state();
    EXPECT_EQ(server_config_b, state_b.server_config);
    EXPECT_EQ(source_address_token_b, state_b.source_address_token);
    EXPECT_EQ(cert_sct_b, state_b.cert_sct);
    EXPECT_EQ(chlo_hash_b, state_b.chlo_hash);
    EXPECT_EQ(server_config_sig_b, state_b.server_config_sig);
    EXPECT_EQ(1U, state_b.certs.size());
    EXPECT_EQ(cert_b, state_b.certs[0]);
  
    RemoveMockTransaction(&kHostInfoTransaction2);
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // Test IsReadyToPersist when there is a pending write.
  TEST(DiskCacheBasedQuicServerInfo, IsReadyToPersist) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
  
    state->server_config = server_config_a;
    state->source_address_token = source_address_token_a;
    state->cert_sct = cert_sct_a;
    state->chlo_hash = chlo_hash_a;
    state->server_config_sig = server_config_sig_a;
    state->certs.push_back(cert_a);
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
  
    // Once we call Persist, IsReadyToPersist should return false until Persist
    // has completed.
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_a, state1.server_config);
    EXPECT_EQ(source_address_token_a, state1.source_address_token);
    EXPECT_EQ(cert_sct_a, state1.cert_sct);
    EXPECT_EQ(chlo_hash_a, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state1.server_config_sig);
    EXPECT_EQ(1U, state1.certs.size());
    EXPECT_EQ(cert_a, state1.certs[0]);
  
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // Test multiple calls to Persist.
  TEST(DiskCacheBasedQuicServerInfo, MultiplePersist) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    // Persist data once.
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_init = "server_config_init";
    const string source_address_token_init = "source_address_token_init";
    const string cert_sct_init = "cert_sct_init";
    const string chlo_hash_init = "chlo_hash_init";
    const string server_config_sig_init = "server_config_sig_init";
    const string cert_init = "cert_init";
  
    state->server_config = server_config_init;
    state->source_address_token = source_address_token_init;
    state->cert_sct = cert_sct_init;
    state->chlo_hash = chlo_hash_init;
    state->server_config_sig = server_config_sig_init;
    state->certs.push_back(cert_init);
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
  
    // Once we call Persist, IsReadyToPersist should return false until Persist
    // has completed.
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
  
    // Persist one more time using the same |quic_server_info| object and without
    // doing another Start() and WaitForDataReady.
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
  
    state->server_config = server_config_a;
    state->source_address_token = source_address_token_a;
    state->cert_sct = cert_sct_a;
    state->chlo_hash = chlo_hash_a;
    state->server_config_sig = server_config_sig_a;
    state->certs.push_back(cert_a);
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
  
    // Once we call Persist, IsReadyToPersist should return false until Persist
    // has completed.
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_a, state1.server_config);
    EXPECT_EQ(source_address_token_a, state1.source_address_token);
    EXPECT_EQ(cert_sct_a, state1.cert_sct);
    EXPECT_EQ(chlo_hash_a, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state1.server_config_sig);
    EXPECT_EQ(1U, state1.certs.size());
    EXPECT_EQ(cert_a, state1.certs[0]);
  
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  TEST(DiskCacheBasedQuicServerInfo, CancelWaitForDataReady) {
    MockBlockingBackendFactory* factory = new MockBlockingBackendFactory();
    MockHttpCache cache(base::WrapUnique(factory));
    TestCompletionCallback callback;
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
    // Now cancel the callback.
    quic_server_info->CancelWaitForDataReadyCallback();
    EXPECT_FALSE(quic_server_info->IsDataReady());
    // Now complete the backend creation and let the callback run.
    factory->FinishCreation();
    EXPECT_TRUE(quic_server_info->IsDataReady());
  }
  
  TEST(DiskCacheBasedQuicServerInfo, CancelWaitForDataReadyButDataIsReady) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    quic_server_info->CancelWaitForDataReadyCallback();
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  TEST(DiskCacheBasedQuicServerInfo, CancelWaitForDataReadyAfterDeleteCache) {
    std::unique_ptr<QuicServerInfo> quic_server_info;
    {
      MockHttpCache cache;
      AddMockTransaction(&kHostInfoTransaction1);
      TestCompletionCallback callback;
  
      QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
      quic_server_info.reset(
          new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
      EXPECT_FALSE(quic_server_info->IsDataReady());
      quic_server_info->Start();
      int rv = quic_server_info->WaitForDataReady(callback.callback());
      quic_server_info->CancelWaitForDataReadyCallback();
      EXPECT_THAT(callback.GetResult(rv), IsOk());
      EXPECT_TRUE(quic_server_info->IsDataReady());
      RemoveMockTransaction(&kHostInfoTransaction1);
    }
    // Cancel the callback after Cache is deleted.
    quic_server_info->ResetWaitForDataReadyCallback();
  }
  
  // Test Start() followed by Persist() without calling WaitForDataReady.
  TEST(DiskCacheBasedQuicServerInfo, StartAndPersist) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    // Wait until Start() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
  
    state->server_config = server_config_a;
    state->source_address_token = source_address_token_a;
    state->cert_sct = cert_sct_a;
    state->chlo_hash = chlo_hash_a;
    state->server_config_sig = server_config_sig_a;
    state->certs.push_back(cert_a);
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
    quic_server_info->OnExternalCacheHit();
  
    // Once we call Persist, IsReadyToPersist should return false until Persist
    // has completed.
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    TestCompletionCallback callback;
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_a, state1.server_config);
    EXPECT_EQ(source_address_token_a, state1.source_address_token);
    EXPECT_EQ(cert_sct_a, state1.cert_sct);
    EXPECT_EQ(chlo_hash_a, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state1.server_config_sig);
    EXPECT_EQ(1U, state1.certs.size());
    EXPECT_EQ(cert_a, state1.certs[0]);
  
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // Test Persisting data when we are not ready to persist and then verify it
  // persists the data when Start() finishes.
  TEST(DiskCacheBasedQuicServerInfo, PersistWhenNotReadyToPersist) {
    MockBlockingBackendFactory* factory = new MockBlockingBackendFactory();
    MockHttpCache cache(base::WrapUnique(factory));
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    // We do a Start(), but don't call WaitForDataReady(). Because we haven't
    // created the backend, we will wait and data wouldn't be ready.
    quic_server_info->Start();
    EXPECT_FALSE(quic_server_info->IsDataReady());
  
    // Persist data once, even though the backend is not ready.
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_init = "server_config_init";
    const string source_address_token_init = "source_address_token_init";
    const string cert_sct_init = "cert_sct_init";
    const string chlo_hash_init = "chlo_hash_init";
    const string server_config_sig_init = "server_config_sig_init";
    const string cert_init = "cert_init";
  
    state->server_config = server_config_init;
    state->source_address_token = source_address_token_init;
    state->cert_sct = cert_sct_init;
    state->chlo_hash = chlo_hash_init;
    state->server_config_sig = server_config_sig_init;
    state->certs.push_back(cert_init);
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Now complete the backend creation and let the callback run.
    factory->FinishCreation();
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_init, state1.server_config);
    EXPECT_EQ(source_address_token_init, state1.source_address_token);
    EXPECT_EQ(cert_sct_init, state1.cert_sct);
    EXPECT_EQ(chlo_hash_init, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_init, state1.server_config_sig);
    EXPECT_EQ(1U, state1.certs.size());
    EXPECT_EQ(cert_init, state1.certs[0]);
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // Test multiple calls to Persist without waiting for the data to be written.
  TEST(DiskCacheBasedQuicServerInfo, MultiplePersistsWithoutWaiting) {
    MockHttpCache cache;
    AddMockTransaction(&kHostInfoTransaction1);
    TestCompletionCallback callback;
  
    QuicServerId server_id("www.google.com", 443, PRIVACY_MODE_DISABLED);
    std::unique_ptr<QuicServerInfo> quic_server_info(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    EXPECT_FALSE(quic_server_info->IsDataReady());
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    // Persist data once.
    QuicServerInfo::State* state = quic_server_info->mutable_state();
    EXPECT_TRUE(state->certs.empty());
    const string server_config_init = "server_config_init";
    const string source_address_token_init = "source_address_token_init";
    const string cert_sct_init = "cert_sct_init";
    const string chlo_hash_init = "chlo_hash_init";
    const string server_config_sig_init = "server_config_sig_init";
    const string cert_init = "cert_init";
  
    state->server_config = server_config_init;
    state->source_address_token = source_address_token_init;
    state->cert_sct = cert_sct_init;
    state->chlo_hash = chlo_hash_init;
    state->server_config_sig = server_config_sig_init;
    state->certs.push_back(cert_init);
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
  
    // Once we call Persist, IsReadyToPersist should return false until Persist
    // has completed.
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
  
    // Persist one more time using the same |quic_server_info| object and without
    // doing another Start() and WaitForDataReady.
    const string server_config_a = "server_config_a";
    const string source_address_token_a = "source_address_token_a";
    const string cert_sct_a = "cert_sct_a";
    const string chlo_hash_a = "chlo_hash_a";
    const string server_config_sig_a = "server_config_sig_a";
    const string cert_a = "cert_a";
  
    state->server_config = server_config_a;
    state->source_address_token = source_address_token_a;
    state->cert_sct = cert_sct_a;
    state->chlo_hash = chlo_hash_a;
    state->server_config_sig = server_config_sig_a;
    state->certs.push_back(cert_a);
    EXPECT_FALSE(quic_server_info->IsReadyToPersist());
    quic_server_info->Persist();
  
    // Wait until Persist() does the work.
    base::RunLoop().RunUntilIdle();
  
    EXPECT_TRUE(quic_server_info->IsReadyToPersist());
  
    // Verify that the state was updated.
    quic_server_info.reset(
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache()));
    quic_server_info->Start();
    rv = quic_server_info->WaitForDataReady(callback.callback());
    EXPECT_THAT(callback.GetResult(rv), IsOk());
    EXPECT_TRUE(quic_server_info->IsDataReady());
  
    // Verify the second time persisted data is persisted.
    const QuicServerInfo::State& state1 = quic_server_info->state();
    EXPECT_EQ(server_config_a, state1.server_config);
    EXPECT_EQ(source_address_token_a, state1.source_address_token);
    EXPECT_EQ(cert_sct_a, state1.cert_sct);
    EXPECT_EQ(chlo_hash_a, state1.chlo_hash);
    EXPECT_EQ(server_config_sig_a, state1.server_config_sig);
    EXPECT_EQ(1U, state1.certs.size());
    EXPECT_EQ(cert_a, state1.certs[0]);
  
    RemoveMockTransaction(&kHostInfoTransaction1);
  }
  
  // crbug.com/439209: test deletion of QuicServerInfo object in the callback
  // doesn't crash.
  TEST(DiskCacheBasedQuicServerInfo, DeleteServerInfoInCallback) {
    // Use the blocking mock backend factory to force asynchronous completion
    // of quic_server_info->WaitForDataReady(), so that the callback will run.
    MockBlockingBackendFactory* factory = new MockBlockingBackendFactory();
    MockHttpCache cache(base::WrapUnique(factory));
    QuicServerId server_id("www.verisign.com", 443, PRIVACY_MODE_DISABLED);
    QuicServerInfo* quic_server_info =
        new DiskCacheBasedQuicServerInfo(server_id, cache.http_cache());
    // |cb| takes owndership and deletes |quic_server_info| when it is called.
    DeleteCacheCompletionCallback cb(quic_server_info);
    quic_server_info->Start();
    int rv = quic_server_info->WaitForDataReady(cb.callback());
    EXPECT_THAT(rv, IsError(ERR_IO_PENDING));
    // Now complete the backend creation and let the callback run.
    factory->FinishCreation();
    EXPECT_THAT(cb.GetResult(rv), IsOk());
  }
  
  }  // namespace net
  