// Copyright 2017 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include <memory>
#include <string>
#include <vector>

#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"

#include <grpcpp/create_channel.h>
#include <grpcpp/security/credentials.h>

#include "src/core/ext/filters/client_channel/backup_poller.h"
#include "src/cpp/client/secure_credentials.h"
#include "src/proto/grpc/testing/xds/v3/cluster.grpc.pb.h"
#include "src/proto/grpc/testing/xds/v3/endpoint.grpc.pb.h"
#include "src/proto/grpc/testing/xds/v3/http_connection_manager.grpc.pb.h"
#include "src/proto/grpc/testing/xds/v3/listener.grpc.pb.h"
#include "src/proto/grpc/testing/xds/v3/route.grpc.pb.h"
#include "test/core/util/test_config.h"
#include "test/cpp/end2end/xds/xds_end2end_test_lib.h"

#ifndef DISABLED_XDS_PROTO_IN_CC

#include "src/cpp/server/csds/csds.h"
#include "src/proto/grpc/testing/xds/v3/csds.grpc.pb.h"

namespace grpc {
namespace testing {
namespace {

using ::envoy::admin::v3::ClientResourceStatus;
using ::envoy::config::cluster::v3::Cluster;
using ::envoy::config::endpoint::v3::ClusterLoadAssignment;
using ::envoy::config::listener::v3::Listener;
using ::envoy::config::route::v3::RouteConfiguration;
using ::envoy::extensions::filters::network::http_connection_manager::v3::
    HttpConnectionManager;

MATCHER_P4(EqNode, id, user_agent_name, user_agent_version, client_features,
           "equals Node") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(id, arg.id(), result_listener);
  ok &= ::testing::ExplainMatchResult(user_agent_name, arg.user_agent_name(),
                                      result_listener);
  ok &= ::testing::ExplainMatchResult(
      user_agent_version, arg.user_agent_version(), result_listener);
  ok &= ::testing::ExplainMatchResult(client_features, arg.client_features(),
                                      result_listener);
  return ok;
}

MATCHER_P6(EqGenericXdsConfig, type_url, name, version_info, xds_config,
           client_status, error_state, "equals GenericXdsConfig") {
  bool ok = true;
  ok &=
      ::testing::ExplainMatchResult(type_url, arg.type_url(), result_listener);
  ok &= ::testing::ExplainMatchResult(name, arg.name(), result_listener);
  ok &= ::testing::ExplainMatchResult(version_info, arg.version_info(),
                                      result_listener);
  ok &= ::testing::ExplainMatchResult(xds_config, arg.xds_config(),
                                      result_listener);
  ok &= ::testing::ExplainMatchResult(client_status, arg.client_status(),
                                      result_listener);
  ok &= ::testing::ExplainMatchResult(error_state, arg.error_state(),
                                      result_listener);
  return ok;
}

MATCHER_P2(EqListener, name, api_listener, "equals Listener") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(name, arg.name(), result_listener);
  ok &= ::testing::ExplainMatchResult(
      api_listener, arg.api_listener().api_listener(), result_listener);
  return ok;
}

MATCHER_P(EqHttpConnectionManagerNotRds, route_config,
          "equals HttpConnectionManager") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(route_config, arg.route_config(),
                                      result_listener);
  return ok;
}

MATCHER_P(EqRouteConfigurationName, name, "equals RouteConfiguration") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(name, arg.name(), result_listener);
  return ok;
}

MATCHER_P2(EqRouteConfiguration, name, cluster_name,
           "equals RouteConfiguration") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(name, arg.name(), result_listener);
  ok &= ::testing::ExplainMatchResult(
      ::testing::ElementsAre(::testing::Property(
          &envoy::config::route::v3::VirtualHost::routes,
          ::testing::ElementsAre(::testing::Property(
              &envoy::config::route::v3::Route::route,
              ::testing::Property(
                  &envoy::config::route::v3::RouteAction::cluster,
                  cluster_name))))),
      arg.virtual_hosts(), result_listener);
  return ok;
}

MATCHER_P(EqCluster, name, "equals Cluster") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(name, arg.name(), result_listener);
  return ok;
}

MATCHER_P(EqEndpoint, port, "equals Endpoint") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(
      port, arg.address().socket_address().port_value(), result_listener);
  return ok;
}

MATCHER_P2(EqLocalityLbEndpoints, port, weight, "equals LocalityLbEndpoints") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(
      ::testing::ElementsAre(::testing::Property(
          &envoy::config::endpoint::v3::LbEndpoint::endpoint,
          EqEndpoint(port))),
      arg.lb_endpoints(), result_listener);
  ok &= ::testing::ExplainMatchResult(
      weight, arg.load_balancing_weight().value(), result_listener);
  return ok;
}

MATCHER_P(EqClusterLoadAssignmentName, cluster_name,
          "equals ClusterLoadAssignment") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(cluster_name, arg.cluster_name(),
                                      result_listener);
  return ok;
}

MATCHER_P3(EqClusterLoadAssignment, cluster_name, port, weight,
           "equals ClusterLoadAssignment") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(cluster_name, arg.cluster_name(),
                                      result_listener);
  ok &= ::testing::ExplainMatchResult(
      ::testing::ElementsAre(EqLocalityLbEndpoints(port, weight)),
      arg.endpoints(), result_listener);
  return ok;
}

MATCHER_P2(EqUpdateFailureState, details, version_info,
           "equals UpdateFailureState") {
  bool ok = true;
  ok &= ::testing::ExplainMatchResult(details, arg.details(), result_listener);
  ok &= ::testing::ExplainMatchResult(version_info, arg.version_info(),
                                      result_listener);
  return ok;
}

MATCHER_P(UnpackListener, matcher, "is a Listener") {
  Listener config;
  if (!::testing::ExplainMatchResult(true, arg.UnpackTo(&config),
                                     result_listener)) {
    return false;
  }
  return ::testing::ExplainMatchResult(matcher, config, result_listener);
}

MATCHER_P(UnpackRouteConfiguration, matcher, "is a RouteConfiguration") {
  RouteConfiguration config;
  if (!::testing::ExplainMatchResult(true, arg.UnpackTo(&config),
                                     result_listener)) {
    return false;
  }
  return ::testing::ExplainMatchResult(matcher, config, result_listener);
}

MATCHER_P(UnpackHttpConnectionManager, matcher, "is a HttpConnectionManager") {
  HttpConnectionManager config;
  if (!::testing::ExplainMatchResult(true, arg.UnpackTo(&config),
                                     result_listener)) {
    return false;
  }
  return ::testing::ExplainMatchResult(matcher, config, result_listener);
}

MATCHER_P(UnpackCluster, matcher, "is a Cluster") {
  Cluster config;
  if (!::testing::ExplainMatchResult(true, arg.UnpackTo(&config),
                                     result_listener)) {
    return false;
  }
  return ::testing::ExplainMatchResult(matcher, config, result_listener);
}

MATCHER_P(UnpackClusterLoadAssignment, matcher, "is a ClusterLoadAssignment") {
  ClusterLoadAssignment config;
  if (!::testing::ExplainMatchResult(true, arg.UnpackTo(&config),
                                     result_listener)) {
    return false;
  }
  return ::testing::ExplainMatchResult(matcher, config, result_listener);
}

MATCHER(IsRdsEnabledHCM, "is a RDS enabled HttpConnectionManager") {
  return ::testing::ExplainMatchResult(
      UnpackHttpConnectionManager(
          ::testing::Property(&HttpConnectionManager::has_rds, true)),
      arg, result_listener);
}

MATCHER_P2(EqNoRdsHCM, route_configuration_name, cluster_name,
           "equals RDS disabled HttpConnectionManager") {
  return ::testing::ExplainMatchResult(
      UnpackHttpConnectionManager(EqHttpConnectionManagerNotRds(
          EqRouteConfiguration(route_configuration_name, cluster_name))),
      arg, result_listener);
}

class ClientStatusDiscoveryServiceTest : public XdsEnd2endTest {
 public:
  ClientStatusDiscoveryServiceTest() {
    admin_server_thread_ = absl::make_unique<AdminServerThread>(this);
    admin_server_thread_->Start();
    std::string admin_server_address = absl::StrCat(
        ipv6_only_ ? "[::1]:" : "127.0.0.1:", admin_server_thread_->port());
    admin_channel_ = grpc::CreateChannel(
        admin_server_address,
        std::make_shared<SecureChannelCredentials>(
            grpc_fake_transport_security_credentials_create()));
    csds_stub_ =
        envoy::service::status::v3::ClientStatusDiscoveryService::NewStub(
            admin_channel_);
    if (GetParam().use_csds_streaming()) {
      stream_ = csds_stub_->StreamClientStatus(&stream_context_);
    }
  }

  ~ClientStatusDiscoveryServiceTest() override {
    if (stream_ != nullptr) {
      EXPECT_TRUE(stream_->WritesDone());
      Status status = stream_->Finish();
      EXPECT_TRUE(status.ok()) << "code=" << status.error_code()
                               << " message=" << status.error_message();
    }
    admin_server_thread_->Shutdown();
  }

  envoy::service::status::v3::ClientStatusResponse FetchCsdsResponse() {
    envoy::service::status::v3::ClientStatusResponse response;
    if (!GetParam().use_csds_streaming()) {
      // Fetch through unary pulls
      ClientContext context;
      Status status = csds_stub_->FetchClientStatus(
          &context, envoy::service::status::v3::ClientStatusRequest(),
          &response);
      EXPECT_TRUE(status.ok()) << "code=" << status.error_code()
                               << " message=" << status.error_message();
    } else {
      // Fetch through streaming pulls
      EXPECT_TRUE(
          stream_->Write(envoy::service::status::v3::ClientStatusRequest()));
      EXPECT_TRUE(stream_->Read(&response));
    }
    return response;
  }

 private:
  // Server thread for CSDS server.
  class AdminServerThread : public ServerThread {
   public:
    explicit AdminServerThread(XdsEnd2endTest* test_obj)
        : ServerThread(test_obj) {}

   private:
    const char* Type() override { return "Admin"; }

    void RegisterAllServices(ServerBuilder* builder) override {
      builder->RegisterService(&csds_service_);
    }
    void StartAllServices() override {}
    void ShutdownAllServices() override {}

    grpc::xds::experimental::ClientStatusDiscoveryService csds_service_;
  };

  std::unique_ptr<AdminServerThread> admin_server_thread_;
  std::shared_ptr<Channel> admin_channel_;
  std::unique_ptr<
      envoy::service::status::v3::ClientStatusDiscoveryService::Stub>
      csds_stub_;
  ClientContext stream_context_;
  std::unique_ptr<
      ClientReaderWriter<envoy::service::status::v3::ClientStatusRequest,
                         envoy::service::status::v3::ClientStatusResponse>>
      stream_;
};

// Run CSDS tests with RDS enabled and disabled.
// These need to run with the bootstrap from an env var instead of from
// a channel arg, since there needs to be a global XdsClient instance.
INSTANTIATE_TEST_SUITE_P(
    XdsTest, ClientStatusDiscoveryServiceTest,
    ::testing::Values(
        XdsTestType().set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_enable_rds_testing(),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_use_csds_streaming(),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_enable_rds_testing()
            .set_use_csds_streaming()),
    &XdsTestType::Name);

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpVanilla) {
  CreateAndStartBackends(1);
  const size_t kNumRpcs = 5;
  EdsResourceArgs args({{"locality0", CreateEndpointsForBackends(0, 1)}});
  balancer_->ads_service()->SetEdsResource(BuildEdsResource(args));
  // Send several RPCs to ensure the xDS setup works
  CheckRpcSendOk(DEBUG_LOCATION, kNumRpcs);
  // Fetches the client config
  auto csds_response = FetchCsdsResponse();
  gpr_log(GPR_INFO, "xDS config dump: %s", csds_response.DebugString().c_str());
  EXPECT_EQ(1, csds_response.config_size());
  const auto& client_config = csds_response.config(0);
  // Validate the Node information
  EXPECT_THAT(client_config.node(),
              EqNode("xds_end2end_test", ::testing::HasSubstr("C-core"),
                     ::testing::HasSubstr(grpc_version_string()),
                     ::testing::ElementsAre(
                         "envoy.lb.does_not_support_overprovisioning")));
  // Listener matcher depends on whether RDS is enabled.
  ::testing::Matcher<google::protobuf::Any> api_listener_matcher;
  if (GetParam().enable_rds_testing()) {
    api_listener_matcher = IsRdsEnabledHCM();
  } else {
    api_listener_matcher =
        EqNoRdsHCM(kDefaultRouteConfigurationName, kDefaultClusterName);
  }
  // Construct list of all matchers.
  std::vector<::testing::Matcher<
      envoy::service::status::v3::ClientConfig_GenericXdsConfig>>
      matchers = {
          // Listener
          EqGenericXdsConfig(
              kLdsTypeUrl, kServerName, "1",
              UnpackListener(EqListener(kServerName, api_listener_matcher)),
              ClientResourceStatus::ACKED, ::testing::_),
          // Cluster
          EqGenericXdsConfig(kCdsTypeUrl, kDefaultClusterName, "1",
                             UnpackCluster(EqCluster(kDefaultClusterName)),
                             ClientResourceStatus::ACKED, ::testing::_),
          // ClusterLoadAssignment
          EqGenericXdsConfig(
              kEdsTypeUrl, kDefaultEdsServiceName, "1",
              UnpackClusterLoadAssignment(EqClusterLoadAssignment(
                  kDefaultEdsServiceName, backends_[0]->port(),
                  kDefaultLocalityWeight)),
              ClientResourceStatus::ACKED, ::testing::_),
      };
  // If RDS is enabled, add matcher for RDS resource.
  if (GetParam().enable_rds_testing()) {
    matchers.push_back(EqGenericXdsConfig(
        kRdsTypeUrl, kDefaultRouteConfigurationName, "1",
        UnpackRouteConfiguration(EqRouteConfiguration(
            kDefaultRouteConfigurationName, kDefaultClusterName)),
        ClientResourceStatus::ACKED, ::testing::_));
  }
  // Validate the dumped xDS configs
  EXPECT_THAT(client_config.generic_xds_configs(),
              ::testing::UnorderedElementsAreArray(matchers))
      << "Actual: " << client_config.DebugString();
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpEmpty) {
  // The CSDS service should not fail if XdsClient is not initialized or there
  // is no working xDS configs.
  FetchCsdsResponse();
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpListenerError) {
  CreateAndStartBackends(1);
  int kFetchConfigRetries = 3;
  int kFetchIntervalMilliseconds = 200;
  EdsResourceArgs args({{"locality0", CreateEndpointsForBackends(0, 1)}});
  balancer_->ads_service()->SetEdsResource(BuildEdsResource(args));
  // Ensure the xDS resolver has working configs.
  CheckRpcSendOk(DEBUG_LOCATION);
  // Bad Listener should be rejected.
  Listener listener;
  listener.set_name(kServerName);
  balancer_->ads_service()->SetLdsResource(listener);
  // The old xDS configs should still be effective.
  CheckRpcSendOk(DEBUG_LOCATION);
  ::testing::Matcher<google::protobuf::Any> api_listener_matcher;
  if (GetParam().enable_rds_testing()) {
    api_listener_matcher = IsRdsEnabledHCM();
  } else {
    api_listener_matcher =
        EqNoRdsHCM(kDefaultRouteConfigurationName, kDefaultClusterName);
  }
  for (int i = 0; i < kFetchConfigRetries; ++i) {
    auto csds_response = FetchCsdsResponse();
    // Check if error state is propagated
    bool ok = ::testing::Value(
        csds_response.config(0).generic_xds_configs(),
        ::testing::Contains(EqGenericXdsConfig(
            kLdsTypeUrl, kServerName, "1",
            UnpackListener(EqListener(kServerName, api_listener_matcher)),
            ClientResourceStatus::NACKED,
            EqUpdateFailureState(
                ::testing::HasSubstr(
                    "Listener has neither address nor ApiListener"),
                "2"))));
    if (ok) return;  // TEST PASSED!
    gpr_sleep_until(
        grpc_timeout_milliseconds_to_deadline(kFetchIntervalMilliseconds));
  }
  FAIL() << "error_state not seen in CSDS responses";
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpRouteError) {
  CreateAndStartBackends(1);
  int kFetchConfigRetries = 3;
  int kFetchIntervalMilliseconds = 200;
  EdsResourceArgs args({{"locality0", CreateEndpointsForBackends(0, 1)}});
  balancer_->ads_service()->SetEdsResource(BuildEdsResource(args));
  // Ensure the xDS resolver has working configs.
  CheckRpcSendOk(DEBUG_LOCATION);
  // Bad route config will be rejected.
  RouteConfiguration route_config;
  route_config.set_name(kDefaultRouteConfigurationName);
  route_config.add_virtual_hosts();
  SetRouteConfiguration(balancer_.get(), route_config);
  // The old xDS configs should still be effective.
  CheckRpcSendOk(DEBUG_LOCATION);
  for (int i = 0; i < kFetchConfigRetries; ++i) {
    auto csds_response = FetchCsdsResponse();
    bool ok = false;
    if (GetParam().enable_rds_testing()) {
      ok = ::testing::Value(
          csds_response.config(0).generic_xds_configs(),
          ::testing::Contains(EqGenericXdsConfig(
              kRdsTypeUrl, kDefaultRouteConfigurationName, "1",
              UnpackRouteConfiguration(EqRouteConfiguration(
                  kDefaultRouteConfigurationName, kDefaultClusterName)),
              ClientResourceStatus::NACKED,
              EqUpdateFailureState(
                  ::testing::HasSubstr("VirtualHost has no domains"), "2"))));
    } else {
      ok = ::testing::Value(
          csds_response.config(0).generic_xds_configs(),
          ::testing::Contains(EqGenericXdsConfig(
              kLdsTypeUrl, kServerName, "1",
              UnpackListener(EqListener(
                  kServerName, EqNoRdsHCM(kDefaultRouteConfigurationName,
                                          kDefaultClusterName))),
              ClientResourceStatus::NACKED,
              EqUpdateFailureState(
                  ::testing::HasSubstr("VirtualHost has no domains"), "2"))));
    }
    if (ok) return;  // TEST PASSED!
    gpr_sleep_until(
        grpc_timeout_milliseconds_to_deadline(kFetchIntervalMilliseconds));
  }
  FAIL() << "error_state not seen in CSDS responses";
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpClusterError) {
  CreateAndStartBackends(1);
  int kFetchConfigRetries = 3;
  int kFetchIntervalMilliseconds = 200;
  EdsResourceArgs args({{"locality0", CreateEndpointsForBackends(0, 1)}});
  balancer_->ads_service()->SetEdsResource(BuildEdsResource(args));
  // Ensure the xDS resolver has working configs.
  CheckRpcSendOk(DEBUG_LOCATION);
  // Listener without any route, will be rejected.
  Cluster cluster;
  cluster.set_name(kDefaultClusterName);
  balancer_->ads_service()->SetCdsResource(cluster);
  // The old xDS configs should still be effective.
  CheckRpcSendOk(DEBUG_LOCATION);
  for (int i = 0; i < kFetchConfigRetries; ++i) {
    auto csds_response = FetchCsdsResponse();
    // Check if error state is propagated
    bool ok = ::testing::Value(
        csds_response.config(0).generic_xds_configs(),
        ::testing::Contains(EqGenericXdsConfig(
            kCdsTypeUrl, kDefaultClusterName, "1",
            UnpackCluster(EqCluster(kDefaultClusterName)),
            ClientResourceStatus::NACKED,
            EqUpdateFailureState(
                ::testing::HasSubstr("DiscoveryType not found"), "2"))));
    if (ok) return;  // TEST PASSED!
    gpr_sleep_until(
        grpc_timeout_milliseconds_to_deadline(kFetchIntervalMilliseconds));
  }
  FAIL() << "error_state not seen in CSDS responses";
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpEndpointError) {
  CreateAndStartBackends(1);
  int kFetchConfigRetries = 3;
  int kFetchIntervalMilliseconds = 200;
  EdsResourceArgs args({{"locality0", CreateEndpointsForBackends(0, 1)}});
  balancer_->ads_service()->SetEdsResource(BuildEdsResource(args));
  // Ensure the xDS resolver has working configs.
  CheckRpcSendOk(DEBUG_LOCATION);
  // Bad endpoint config will be rejected.
  ClusterLoadAssignment cluster_load_assignment;
  cluster_load_assignment.set_cluster_name(kDefaultEdsServiceName);
  auto* endpoints = cluster_load_assignment.add_endpoints();
  endpoints->mutable_load_balancing_weight()->set_value(1);
  auto* endpoint = endpoints->add_lb_endpoints()->mutable_endpoint();
  endpoint->mutable_address()->mutable_socket_address()->set_port_value(1 << 1);
  balancer_->ads_service()->SetEdsResource(cluster_load_assignment);
  // The old xDS configs should still be effective.
  CheckRpcSendOk(DEBUG_LOCATION);
  for (int i = 0; i < kFetchConfigRetries; ++i) {
    auto csds_response = FetchCsdsResponse();
    // Check if error state is propagated
    bool ok = ::testing::Value(
        csds_response.config(0).generic_xds_configs(),
        ::testing::Contains(EqGenericXdsConfig(
            kEdsTypeUrl, kDefaultEdsServiceName, "1",
            UnpackClusterLoadAssignment(EqClusterLoadAssignment(
                kDefaultEdsServiceName, backends_[0]->port(),
                kDefaultLocalityWeight)),
            ClientResourceStatus::NACKED,
            EqUpdateFailureState(::testing::HasSubstr("Empty locality"),
                                 "2"))));
    if (ok) return;  // TEST PASSED!
    gpr_sleep_until(
        grpc_timeout_milliseconds_to_deadline(kFetchIntervalMilliseconds));
  }
  FAIL() << "error_state not seen in CSDS responses";
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpListenerRequested) {
  int kTimeoutMillisecond = 1000;
  balancer_->ads_service()->UnsetResource(kLdsTypeUrl, kServerName);
  CheckRpcSendFailure(DEBUG_LOCATION, StatusCode::DEADLINE_EXCEEDED,
                      "Deadline Exceeded",
                      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(csds_response.config(0).generic_xds_configs(),
              ::testing::Contains(EqGenericXdsConfig(
                  kLdsTypeUrl, kServerName, ::testing::_, ::testing::_,
                  ClientResourceStatus::REQUESTED, ::testing::_)));
}

TEST_P(ClientStatusDiscoveryServiceTest, XdsConfigDumpClusterRequested) {
  int kTimeoutMillisecond = 1000;
  std::string kClusterName1 = "cluster-1";
  std::string kClusterName2 = "cluster-2";
  // Create a route config requesting two non-existing clusters
  RouteConfiguration route_config;
  route_config.set_name(kDefaultRouteConfigurationName);
  auto* vh = route_config.add_virtual_hosts();
  // The VirtualHost must match the domain name, otherwise will cause resolver
  // transient failure.
  vh->add_domains("*");
  auto* routes1 = vh->add_routes();
  routes1->mutable_match()->set_prefix("");
  routes1->mutable_route()->set_cluster(kClusterName1);
  auto* routes2 = vh->add_routes();
  routes2->mutable_match()->set_prefix("");
  routes2->mutable_route()->set_cluster(kClusterName2);
  SetRouteConfiguration(balancer_.get(), route_config);
  // Try to get the configs plumb through
  CheckRpcSendFailure(DEBUG_LOCATION, StatusCode::DEADLINE_EXCEEDED,
                      "Deadline Exceeded",
                      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(csds_response.config(0).generic_xds_configs(),
              ::testing::AllOf(
                  ::testing::Contains(EqGenericXdsConfig(
                      kCdsTypeUrl, kClusterName1, ::testing::_, ::testing::_,
                      ClientResourceStatus::REQUESTED, ::testing::_)),
                  ::testing::Contains(EqGenericXdsConfig(
                      kCdsTypeUrl, kClusterName2, ::testing::_, ::testing::_,
                      ClientResourceStatus::REQUESTED, ::testing::_))));
}

class CsdsShortAdsTimeoutTest : public ClientStatusDiscoveryServiceTest {
 protected:
  void SetUp() override {
    // Shorten the ADS subscription timeout to speed up the test run.
    InitClient(BootstrapBuilder(), /*lb_expected_authority=*/"",
               /*xds_resource_does_not_exist_timeout_ms=*/2000);
  }
};

// Run CSDS tests with RDS enabled and disabled.
// These need to run with the bootstrap from an env var instead of from
// a channel arg, since there needs to be a global XdsClient instance.
INSTANTIATE_TEST_SUITE_P(
    XdsTest, CsdsShortAdsTimeoutTest,
    ::testing::Values(
        XdsTestType().set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_enable_rds_testing(),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_use_csds_streaming(),
        XdsTestType()
            .set_bootstrap_source(XdsTestType::kBootstrapFromEnvVar)
            .set_enable_rds_testing()
            .set_use_csds_streaming()),
    &XdsTestType::Name);

TEST_P(CsdsShortAdsTimeoutTest, XdsConfigDumpListenerDoesNotExist) {
  int kTimeoutMillisecond = 1000000;  // 1000s wait for the transient failure.
  balancer_->ads_service()->UnsetResource(kLdsTypeUrl, kServerName);
  CheckRpcSendFailure(DEBUG_LOCATION, StatusCode::UNAVAILABLE,
                      absl::StrCat("empty address list: ", kServerName,
                                   ": xDS listener resource does not exist"),
                      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(csds_response.config(0).generic_xds_configs(),
              ::testing::Contains(EqGenericXdsConfig(
                  kLdsTypeUrl, kServerName, ::testing::_, ::testing::_,
                  ClientResourceStatus::DOES_NOT_EXIST, ::testing::_)));
}

TEST_P(CsdsShortAdsTimeoutTest, XdsConfigDumpRouteConfigDoesNotExist) {
  if (!GetParam().enable_rds_testing()) return;
  int kTimeoutMillisecond = 1000000;  // 1000s wait for the transient failure.
  balancer_->ads_service()->UnsetResource(kRdsTypeUrl,
                                          kDefaultRouteConfigurationName);
  CheckRpcSendFailure(
      DEBUG_LOCATION, StatusCode::UNAVAILABLE,
      absl::StrCat("empty address list: ", kDefaultRouteConfigurationName,
                   ": xDS route configuration resource does not exist"),
      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(
      csds_response.config(0).generic_xds_configs(),
      ::testing::Contains(EqGenericXdsConfig(
          kRdsTypeUrl, kDefaultRouteConfigurationName, ::testing::_,
          ::testing::_, ClientResourceStatus::DOES_NOT_EXIST, ::testing::_)));
}

TEST_P(CsdsShortAdsTimeoutTest, XdsConfigDumpClusterDoesNotExist) {
  int kTimeoutMillisecond = 1000000;  // 1000s wait for the transient failure.
  balancer_->ads_service()->UnsetResource(kCdsTypeUrl, kDefaultClusterName);
  CheckRpcSendFailure(
      DEBUG_LOCATION, StatusCode::UNAVAILABLE,
      absl::StrCat("CDS resource \"", kDefaultClusterName, "\" does not exist"),
      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(csds_response.config(0).generic_xds_configs(),
              ::testing::Contains(EqGenericXdsConfig(
                  kCdsTypeUrl, kDefaultClusterName, ::testing::_, ::testing::_,
                  ClientResourceStatus::DOES_NOT_EXIST, ::testing::_)));
}

TEST_P(CsdsShortAdsTimeoutTest, XdsConfigDumpEndpointDoesNotExist) {
  int kTimeoutMillisecond = 1000000;  // 1000s wait for the transient failure.
  balancer_->ads_service()->UnsetResource(kEdsTypeUrl, kDefaultEdsServiceName);
  CheckRpcSendFailure(
      DEBUG_LOCATION, StatusCode::UNAVAILABLE,
      // TODO(roth): Improve this error message as part of
      // https://github.com/grpc/grpc/issues/22883.
      "weighted_target: all children report state TRANSIENT_FAILURE",
      RpcOptions().set_timeout_ms(kTimeoutMillisecond));
  auto csds_response = FetchCsdsResponse();
  EXPECT_THAT(
      csds_response.config(0).generic_xds_configs(),
      ::testing::Contains(EqGenericXdsConfig(
          kEdsTypeUrl, kDefaultEdsServiceName, ::testing::_, ::testing::_,
          ClientResourceStatus::DOES_NOT_EXIST, ::testing::_)));
}

}  // namespace
}  // namespace testing
}  // namespace grpc

#endif  // DISABLED_XDS_PROTO_IN_CC

int main(int argc, char** argv) {
  grpc::testing::TestEnvironment env(&argc, argv);
  ::testing::InitGoogleTest(&argc, argv);
  // Make the backup poller poll very frequently in order to pick up
  // updates from all the subchannels's FDs.
  GPR_GLOBAL_CONFIG_SET(grpc_client_channel_backup_poll_interval_ms, 1);
#if TARGET_OS_IPHONE
  // Workaround Apple CFStream bug
  gpr_setenv("grpc_cfstream", "0");
#endif
  grpc_init();
  const auto result = RUN_ALL_TESTS();
  grpc_shutdown();
  return result;
}