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2083 lines
83 KiB
2083 lines
83 KiB
// |
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// Copyright 2017 gRPC authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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#include <deque> |
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#include <memory> |
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#include <mutex> |
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#include <set> |
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#include <sstream> |
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#include <string> |
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#include <thread> |
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|
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#include <gmock/gmock.h> |
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#include <gtest/gtest.h> |
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|
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#include "absl/memory/memory.h" |
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#include "absl/strings/str_cat.h" |
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#include "absl/strings/str_format.h" |
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|
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#include <grpc/grpc.h> |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/log.h> |
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#include <grpc/support/time.h> |
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#include <grpcpp/channel.h> |
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#include <grpcpp/client_context.h> |
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#include <grpcpp/create_channel.h> |
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#include <grpcpp/impl/codegen/sync.h> |
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#include <grpcpp/server.h> |
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#include <grpcpp/server_builder.h> |
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|
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#include "src/core/ext/filters/client_channel/backup_poller.h" |
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#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.h" |
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#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_balancer_addresses.h" |
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#include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" |
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#include "src/core/lib/address_utils/parse_address.h" |
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#include "src/core/lib/channel/channel_args.h" |
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#include "src/core/lib/gpr/env.h" |
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#include "src/core/lib/gprpp/ref_counted_ptr.h" |
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#include "src/core/lib/iomgr/sockaddr.h" |
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#include "src/core/lib/resolver/server_address.h" |
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#include "src/core/lib/security/credentials/fake/fake_credentials.h" |
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#include "src/core/lib/service_config/service_config_impl.h" |
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#include "src/cpp/client/secure_credentials.h" |
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#include "src/cpp/server/secure_server_credentials.h" |
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#include "src/proto/grpc/lb/v1/load_balancer.grpc.pb.h" |
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#include "src/proto/grpc/testing/echo.grpc.pb.h" |
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#include "test/core/util/port.h" |
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#include "test/core/util/resolve_localhost_ip46.h" |
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#include "test/core/util/test_config.h" |
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#include "test/cpp/end2end/counted_service.h" |
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#include "test/cpp/end2end/test_service_impl.h" |
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#include "test/cpp/util/test_config.h" |
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|
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// TODO(dgq): Other scenarios in need of testing: |
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// - Send a serverlist with faulty ip:port addresses (port > 2^16, etc). |
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// - Test reception of invalid serverlist |
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// - Test against a non-LB server. |
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// - Random LB server closing the stream unexpectedly. |
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// |
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// Findings from end to end testing to be covered here: |
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// - Handling of LB servers restart, including reconnection after backing-off |
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// retries. |
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// - Destruction of load balanced channel (and therefore of grpclb instance) |
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// while: |
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// 1) the internal LB call is still active. This should work by virtue |
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// of the weak reference the LB call holds. The call should be terminated as |
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// part of the grpclb shutdown process. |
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// 2) the retry timer is active. Again, the weak reference it holds should |
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// prevent a premature call to \a glb_destroy. |
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|
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using std::chrono::system_clock; |
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|
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using grpc::lb::v1::LoadBalancer; |
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using grpc::lb::v1::LoadBalanceRequest; |
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using grpc::lb::v1::LoadBalanceResponse; |
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|
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namespace grpc { |
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namespace testing { |
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namespace { |
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|
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constexpr char kDefaultServiceConfig[] = |
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"{\n" |
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" \"loadBalancingConfig\":[\n" |
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" { \"grpclb\":{} }\n" |
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" ]\n" |
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"}"; |
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using BackendService = CountedService<TestServiceImpl>; |
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using BalancerService = CountedService<LoadBalancer::Service>; |
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|
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const char g_kCallCredsMdKey[] = "Balancer should not ..."; |
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const char g_kCallCredsMdValue[] = "... receive me"; |
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|
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// A test user agent string sent by the client only to the grpclb loadbalancer. |
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// The backend should not see this user-agent string. |
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constexpr char kGrpclbSpecificUserAgentString[] = "grpc-grpclb-test-user-agent"; |
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|
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class BackendServiceImpl : public BackendService { |
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public: |
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BackendServiceImpl() {} |
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Status Echo(ServerContext* context, const EchoRequest* request, |
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EchoResponse* response) override { |
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// The backend should not see a test user agent configured at the client |
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// using GRPC_ARG_GRPCLB_CHANNEL_ARGS. |
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auto it = context->client_metadata().find("user-agent"); |
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if (it != context->client_metadata().end()) { |
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EXPECT_FALSE(it->second.starts_with(kGrpclbSpecificUserAgentString)); |
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} |
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// Backend should receive the call credentials metadata. |
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auto call_credentials_entry = |
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context->client_metadata().find(g_kCallCredsMdKey); |
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EXPECT_NE(call_credentials_entry, context->client_metadata().end()); |
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if (call_credentials_entry != context->client_metadata().end()) { |
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EXPECT_EQ(call_credentials_entry->second, g_kCallCredsMdValue); |
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} |
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IncreaseRequestCount(); |
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const auto status = TestServiceImpl::Echo(context, request, response); |
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IncreaseResponseCount(); |
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AddClient(context->peer()); |
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return status; |
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} |
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void Start() {} |
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void Shutdown() {} |
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|
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std::set<std::string> clients() { |
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grpc::internal::MutexLock lock(&clients_mu_); |
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return clients_; |
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} |
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private: |
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void AddClient(const std::string& client) { |
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grpc::internal::MutexLock lock(&clients_mu_); |
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clients_.insert(client); |
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} |
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grpc::internal::Mutex clients_mu_; |
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std::set<std::string> clients_ ABSL_GUARDED_BY(&clients_mu_); |
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}; |
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std::string Ip4ToPackedString(const char* ip_str) { |
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struct in_addr ip4; |
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GPR_ASSERT(inet_pton(AF_INET, ip_str, &ip4) == 1); |
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return std::string(reinterpret_cast<const char*>(&ip4), sizeof(ip4)); |
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} |
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std::string Ip6ToPackedString(const char* ip_str) { |
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struct in6_addr ip6; |
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GPR_ASSERT(inet_pton(AF_INET6, ip_str, &ip6) == 1); |
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return std::string(reinterpret_cast<const char*>(&ip6), sizeof(ip6)); |
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} |
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struct ClientStats { |
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size_t num_calls_started = 0; |
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size_t num_calls_finished = 0; |
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size_t num_calls_finished_with_client_failed_to_send = 0; |
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size_t num_calls_finished_known_received = 0; |
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std::map<std::string, size_t> drop_token_counts; |
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ClientStats& operator+=(const ClientStats& other) { |
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num_calls_started += other.num_calls_started; |
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num_calls_finished += other.num_calls_finished; |
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num_calls_finished_with_client_failed_to_send += |
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other.num_calls_finished_with_client_failed_to_send; |
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num_calls_finished_known_received += |
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other.num_calls_finished_known_received; |
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for (const auto& p : other.drop_token_counts) { |
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drop_token_counts[p.first] += p.second; |
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} |
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return *this; |
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} |
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void Reset() { |
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num_calls_started = 0; |
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num_calls_finished = 0; |
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num_calls_finished_with_client_failed_to_send = 0; |
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num_calls_finished_known_received = 0; |
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drop_token_counts.clear(); |
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} |
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}; |
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class BalancerServiceImpl : public BalancerService { |
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public: |
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using Stream = ServerReaderWriter<LoadBalanceResponse, LoadBalanceRequest>; |
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using ResponseDelayPair = std::pair<LoadBalanceResponse, int>; |
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explicit BalancerServiceImpl(int client_load_reporting_interval_seconds) |
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: client_load_reporting_interval_seconds_( |
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client_load_reporting_interval_seconds) {} |
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Status BalanceLoad(ServerContext* context, Stream* stream) override { |
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gpr_log(GPR_INFO, "LB[%p]: BalanceLoad", this); |
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{ |
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grpc::internal::MutexLock lock(&mu_); |
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if (serverlist_done_) goto done; |
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} |
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{ |
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// The loadbalancer should see a test user agent because it was |
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// specifically configured at the client using |
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// GRPC_ARG_GRPCLB_CHANNEL_ARGS |
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auto it = context->client_metadata().find("user-agent"); |
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EXPECT_TRUE(it != context->client_metadata().end()); |
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if (it != context->client_metadata().end()) { |
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EXPECT_THAT(std::string(it->second.data(), it->second.length()), |
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::testing::StartsWith(kGrpclbSpecificUserAgentString)); |
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} |
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// Balancer shouldn't receive the call credentials metadata. |
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EXPECT_EQ(context->client_metadata().find(g_kCallCredsMdKey), |
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context->client_metadata().end()); |
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LoadBalanceRequest request; |
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std::vector<ResponseDelayPair> responses_and_delays; |
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if (!stream->Read(&request)) { |
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goto done; |
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} else { |
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if (request.has_initial_request()) { |
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grpc::internal::MutexLock lock(&mu_); |
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service_names_.push_back(request.initial_request().name()); |
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} |
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} |
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IncreaseRequestCount(); |
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gpr_log(GPR_INFO, "LB[%p]: received initial message '%s'", this, |
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request.DebugString().c_str()); |
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// TODO(juanlishen): Initial response should always be the first response. |
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if (client_load_reporting_interval_seconds_ > 0) { |
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LoadBalanceResponse initial_response; |
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initial_response.mutable_initial_response() |
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->mutable_client_stats_report_interval() |
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->set_seconds(client_load_reporting_interval_seconds_); |
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stream->Write(initial_response); |
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} |
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{ |
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grpc::internal::MutexLock lock(&mu_); |
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responses_and_delays = responses_and_delays_; |
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} |
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for (const auto& response_and_delay : responses_and_delays) { |
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SendResponse(stream, response_and_delay.first, |
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response_and_delay.second); |
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} |
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{ |
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grpc::internal::MutexLock lock(&mu_); |
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while (!serverlist_done_) { |
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serverlist_cond_.Wait(&mu_); |
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} |
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} |
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if (client_load_reporting_interval_seconds_ > 0) { |
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request.Clear(); |
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while (stream->Read(&request)) { |
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gpr_log(GPR_INFO, "LB[%p]: received client load report message '%s'", |
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this, request.DebugString().c_str()); |
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GPR_ASSERT(request.has_client_stats()); |
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ClientStats load_report; |
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load_report.num_calls_started = |
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request.client_stats().num_calls_started(); |
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load_report.num_calls_finished = |
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request.client_stats().num_calls_finished(); |
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load_report.num_calls_finished_with_client_failed_to_send = |
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request.client_stats() |
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.num_calls_finished_with_client_failed_to_send(); |
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load_report.num_calls_finished_known_received = |
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request.client_stats().num_calls_finished_known_received(); |
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for (const auto& drop_token_count : |
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request.client_stats().calls_finished_with_drop()) { |
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load_report |
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.drop_token_counts[drop_token_count.load_balance_token()] = |
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drop_token_count.num_calls(); |
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} |
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// We need to acquire the lock here in order to prevent the notify_one |
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// below from firing before its corresponding wait is executed. |
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grpc::internal::MutexLock lock(&mu_); |
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load_report_queue_.emplace_back(std::move(load_report)); |
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load_report_cond_.Signal(); |
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} |
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} |
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} |
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done: |
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gpr_log(GPR_INFO, "LB[%p]: done", this); |
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return Status::OK; |
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} |
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void add_response(const LoadBalanceResponse& response, int send_after_ms) { |
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grpc::internal::MutexLock lock(&mu_); |
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responses_and_delays_.push_back(std::make_pair(response, send_after_ms)); |
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} |
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void Start() { |
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grpc::internal::MutexLock lock(&mu_); |
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serverlist_done_ = false; |
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responses_and_delays_.clear(); |
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load_report_queue_.clear(); |
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} |
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void Shutdown() { |
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NotifyDoneWithServerlists(); |
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gpr_log(GPR_INFO, "LB[%p]: shut down", this); |
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} |
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ClientStats WaitForLoadReport() { |
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grpc::internal::MutexLock lock(&mu_); |
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if (load_report_queue_.empty()) { |
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while (load_report_queue_.empty()) { |
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load_report_cond_.Wait(&mu_); |
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} |
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} |
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ClientStats load_report = std::move(load_report_queue_.front()); |
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load_report_queue_.pop_front(); |
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return load_report; |
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} |
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void NotifyDoneWithServerlists() { |
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grpc::internal::MutexLock lock(&mu_); |
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if (!serverlist_done_) { |
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serverlist_done_ = true; |
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serverlist_cond_.SignalAll(); |
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} |
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} |
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std::vector<std::string> service_names() { |
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grpc::internal::MutexLock lock(&mu_); |
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return service_names_; |
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} |
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private: |
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void SendResponse(Stream* stream, const LoadBalanceResponse& response, |
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int delay_ms) { |
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gpr_log(GPR_INFO, "LB[%p]: sleeping for %d ms...", this, delay_ms); |
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if (delay_ms > 0) { |
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gpr_sleep_until(grpc_timeout_milliseconds_to_deadline(delay_ms)); |
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} |
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gpr_log(GPR_INFO, "LB[%p]: Woke up! Sending response '%s'", this, |
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response.DebugString().c_str()); |
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IncreaseResponseCount(); |
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stream->Write(response); |
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} |
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const int client_load_reporting_interval_seconds_; |
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std::vector<ResponseDelayPair> responses_and_delays_; |
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std::vector<std::string> service_names_; |
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grpc::internal::Mutex mu_; |
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grpc::internal::CondVar serverlist_cond_; |
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bool serverlist_done_ ABSL_GUARDED_BY(mu_) = false; |
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grpc::internal::CondVar load_report_cond_; |
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std::deque<ClientStats> load_report_queue_ ABSL_GUARDED_BY(mu_); |
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}; |
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class GrpclbEnd2endTest : public ::testing::Test { |
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protected: |
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GrpclbEnd2endTest(size_t num_backends, size_t num_balancers, |
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int client_load_reporting_interval_seconds) |
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: server_host_("localhost"), |
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num_backends_(num_backends), |
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num_balancers_(num_balancers), |
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client_load_reporting_interval_seconds_( |
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client_load_reporting_interval_seconds) {} |
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static void SetUpTestCase() { |
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// Make the backup poller poll very frequently in order to pick up |
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// updates from all the subchannels's FDs. |
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GPR_GLOBAL_CONFIG_SET(grpc_client_channel_backup_poll_interval_ms, 1); |
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#if TARGET_OS_IPHONE |
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// Workaround Apple CFStream bug |
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gpr_setenv("grpc_cfstream", "0"); |
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#endif |
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grpc_init(); |
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} |
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static void TearDownTestCase() { grpc_shutdown(); } |
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void SetUp() override { |
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bool localhost_resolves_to_ipv4 = false; |
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bool localhost_resolves_to_ipv6 = false; |
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grpc_core::LocalhostResolves(&localhost_resolves_to_ipv4, |
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&localhost_resolves_to_ipv6); |
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ipv6_only_ = !localhost_resolves_to_ipv4 && localhost_resolves_to_ipv6; |
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response_generator_ = |
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grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>(); |
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// Start the backends. |
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for (size_t i = 0; i < num_backends_; ++i) { |
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backends_.emplace_back(new ServerThread<BackendServiceImpl>("backend")); |
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backends_.back()->Start(server_host_); |
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} |
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// Start the load balancers. |
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for (size_t i = 0; i < num_balancers_; ++i) { |
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balancers_.emplace_back(new ServerThread<BalancerServiceImpl>( |
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"balancer", client_load_reporting_interval_seconds_)); |
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balancers_.back()->Start(server_host_); |
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} |
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ResetStub(); |
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} |
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void TearDown() override { |
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ShutdownAllBackends(); |
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for (auto& balancer : balancers_) balancer->Shutdown(); |
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} |
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void StartAllBackends() { |
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for (auto& backend : backends_) backend->Start(server_host_); |
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} |
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|
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void StartBackend(size_t index) { backends_[index]->Start(server_host_); } |
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|
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void ShutdownAllBackends() { |
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for (auto& backend : backends_) backend->Shutdown(); |
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} |
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|
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void ShutdownBackend(size_t index) { backends_[index]->Shutdown(); } |
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|
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void ResetStub(int fallback_timeout = 0, |
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const std::string& expected_targets = "", |
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int subchannel_cache_delay_ms = 0) { |
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// Send a separate user agent string for the grpclb load balancer alone. |
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grpc_core::ChannelArgs grpclb_channel_args; |
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// Set a special user agent string for the grpclb load balancer. It |
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// will be verified at the load balancer. |
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grpclb_channel_args = grpclb_channel_args.Set( |
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GRPC_ARG_PRIMARY_USER_AGENT_STRING, kGrpclbSpecificUserAgentString); |
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ChannelArguments args; |
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if (fallback_timeout > 0) args.SetGrpclbFallbackTimeout(fallback_timeout); |
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args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR, |
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response_generator_.get()); |
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if (!expected_targets.empty()) { |
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args.SetString(GRPC_ARG_FAKE_SECURITY_EXPECTED_TARGETS, expected_targets); |
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grpclb_channel_args = grpclb_channel_args.Set( |
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GRPC_ARG_FAKE_SECURITY_EXPECTED_TARGETS, expected_targets); |
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} |
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if (subchannel_cache_delay_ms > 0) { |
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args.SetInt(GRPC_ARG_GRPCLB_SUBCHANNEL_CACHE_INTERVAL_MS, |
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subchannel_cache_delay_ms * grpc_test_slowdown_factor()); |
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} |
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static const grpc_arg_pointer_vtable channel_args_vtable = { |
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// copy |
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[](void* p) -> void* { |
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return grpc_channel_args_copy(static_cast<grpc_channel_args*>(p)); |
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}, |
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// destroy |
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[](void* p) { |
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grpc_channel_args_destroy(static_cast<grpc_channel_args*>(p)); |
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}, |
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// compare |
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[](void* p1, void* p2) { |
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return grpc_channel_args_compare(static_cast<grpc_channel_args*>(p1), |
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static_cast<grpc_channel_args*>(p2)); |
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}, |
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}; |
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// Specify channel args for the channel to the load balancer. |
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args.SetPointerWithVtable( |
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GRPC_ARG_EXPERIMENTAL_GRPCLB_CHANNEL_ARGS, |
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const_cast<grpc_channel_args*>(grpclb_channel_args.ToC().get()), |
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&channel_args_vtable); |
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std::ostringstream uri; |
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uri << "fake:///" << kApplicationTargetName_; |
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// TODO(dgq): templatize tests to run everything using both secure and |
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// insecure channel credentials. |
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grpc_channel_credentials* channel_creds = |
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grpc_fake_transport_security_credentials_create(); |
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grpc_call_credentials* call_creds = grpc_md_only_test_credentials_create( |
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g_kCallCredsMdKey, g_kCallCredsMdValue); |
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std::shared_ptr<ChannelCredentials> creds( |
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new SecureChannelCredentials(grpc_composite_channel_credentials_create( |
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channel_creds, call_creds, nullptr))); |
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call_creds->Unref(); |
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channel_creds->Unref(); |
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channel_ = grpc::CreateCustomChannel(uri.str(), creds, args); |
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stub_ = grpc::testing::EchoTestService::NewStub(channel_); |
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} |
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|
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void ResetBackendCounters() { |
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for (auto& backend : backends_) backend->service_.ResetCounters(); |
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} |
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|
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ClientStats WaitForLoadReports() { |
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ClientStats client_stats; |
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for (auto& balancer : balancers_) { |
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client_stats += balancer->service_.WaitForLoadReport(); |
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} |
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return client_stats; |
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} |
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|
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bool SeenAllBackends(size_t start_index = 0, size_t stop_index = 0) { |
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if (stop_index == 0) stop_index = backends_.size(); |
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for (size_t i = start_index; i < stop_index; ++i) { |
|
if (backends_[i]->service_.request_count() == 0) return false; |
|
} |
|
return true; |
|
} |
|
|
|
void SendRpcAndCount(int* num_total, int* num_ok, int* num_failure, |
|
int* num_drops) { |
|
const Status status = SendRpc(); |
|
if (status.ok()) { |
|
++*num_ok; |
|
} else { |
|
if (status.error_message() == "drop directed by grpclb balancer") { |
|
++*num_drops; |
|
} else { |
|
++*num_failure; |
|
} |
|
} |
|
++*num_total; |
|
} |
|
|
|
std::tuple<int, int, int> WaitForAllBackends(int num_requests_multiple_of = 1, |
|
size_t start_index = 0, |
|
size_t stop_index = 0) { |
|
int num_ok = 0; |
|
int num_failure = 0; |
|
int num_drops = 0; |
|
int num_total = 0; |
|
while (!SeenAllBackends(start_index, stop_index)) { |
|
SendRpcAndCount(&num_total, &num_ok, &num_failure, &num_drops); |
|
} |
|
while (num_total % num_requests_multiple_of != 0) { |
|
SendRpcAndCount(&num_total, &num_ok, &num_failure, &num_drops); |
|
} |
|
ResetBackendCounters(); |
|
gpr_log(GPR_INFO, |
|
"Performed %d warm up requests (a multiple of %d) against the " |
|
"backends. %d succeeded, %d failed, %d dropped.", |
|
num_total, num_requests_multiple_of, num_ok, num_failure, |
|
num_drops); |
|
return std::make_tuple(num_ok, num_failure, num_drops); |
|
} |
|
|
|
void WaitForBackend(size_t backend_idx) { |
|
do { |
|
(void)SendRpc(); |
|
} while (backends_[backend_idx]->service_.request_count() == 0); |
|
ResetBackendCounters(); |
|
} |
|
|
|
struct AddressData { |
|
int port; |
|
std::string balancer_name; |
|
}; |
|
|
|
grpc_core::ServerAddressList CreateLbAddressesFromAddressDataList( |
|
const std::vector<AddressData>& address_data) { |
|
grpc_core::ServerAddressList addresses; |
|
for (const auto& addr : address_data) { |
|
absl::StatusOr<grpc_core::URI> lb_uri = |
|
grpc_core::URI::Parse(absl::StrCat( |
|
ipv6_only_ ? "ipv6:[::1]:" : "ipv4:127.0.0.1:", addr.port)); |
|
GPR_ASSERT(lb_uri.ok()); |
|
grpc_resolved_address address; |
|
GPR_ASSERT(grpc_parse_uri(*lb_uri, &address)); |
|
addresses.emplace_back( |
|
address.addr, address.len, |
|
grpc_core::ChannelArgs().Set(GRPC_ARG_DEFAULT_AUTHORITY, |
|
addr.balancer_name)); |
|
} |
|
return addresses; |
|
} |
|
|
|
grpc_core::Resolver::Result MakeResolverResult( |
|
const std::vector<AddressData>& balancer_address_data, |
|
const std::vector<AddressData>& backend_address_data = {}, |
|
const char* service_config_json = kDefaultServiceConfig) { |
|
grpc_core::Resolver::Result result; |
|
result.addresses = |
|
CreateLbAddressesFromAddressDataList(backend_address_data); |
|
result.service_config = grpc_core::ServiceConfigImpl::Create( |
|
grpc_core::ChannelArgs(), service_config_json); |
|
GPR_ASSERT(result.service_config.ok()); |
|
grpc_core::ServerAddressList balancer_addresses = |
|
CreateLbAddressesFromAddressDataList(balancer_address_data); |
|
result.args = grpc_core::SetGrpcLbBalancerAddresses( |
|
grpc_core::ChannelArgs(), std::move(balancer_addresses)); |
|
return result; |
|
} |
|
|
|
void SetNextResolutionAllBalancers( |
|
const char* service_config_json = kDefaultServiceConfig) { |
|
std::vector<AddressData> addresses; |
|
for (size_t i = 0; i < balancers_.size(); ++i) { |
|
addresses.emplace_back(AddressData{balancers_[i]->port_, ""}); |
|
} |
|
SetNextResolution(addresses, {}, service_config_json); |
|
} |
|
|
|
void SetNextResolution( |
|
const std::vector<AddressData>& balancer_address_data, |
|
const std::vector<AddressData>& backend_address_data = {}, |
|
const char* service_config_json = kDefaultServiceConfig) { |
|
grpc_core::ExecCtx exec_ctx; |
|
grpc_core::Resolver::Result result = MakeResolverResult( |
|
balancer_address_data, backend_address_data, service_config_json); |
|
response_generator_->SetResponse(std::move(result)); |
|
} |
|
|
|
void SetNextReresolutionResponse( |
|
const std::vector<AddressData>& balancer_address_data, |
|
const std::vector<AddressData>& backend_address_data = {}, |
|
const char* service_config_json = kDefaultServiceConfig) { |
|
grpc_core::ExecCtx exec_ctx; |
|
grpc_core::Resolver::Result result = MakeResolverResult( |
|
balancer_address_data, backend_address_data, service_config_json); |
|
response_generator_->SetReresolutionResponse(std::move(result)); |
|
} |
|
|
|
std::vector<int> GetBackendPorts(size_t start_index = 0, |
|
size_t stop_index = 0) const { |
|
if (stop_index == 0) stop_index = backends_.size(); |
|
std::vector<int> backend_ports; |
|
for (size_t i = start_index; i < stop_index; ++i) { |
|
backend_ports.push_back(backends_[i]->port_); |
|
} |
|
return backend_ports; |
|
} |
|
|
|
void ScheduleResponseForBalancer(size_t i, |
|
const LoadBalanceResponse& response, |
|
int delay_ms) { |
|
balancers_[i]->service_.add_response(response, delay_ms); |
|
} |
|
|
|
LoadBalanceResponse BuildResponseForBackends( |
|
const std::vector<int>& backend_ports, |
|
const std::map<std::string, size_t>& drop_token_counts) { |
|
LoadBalanceResponse response; |
|
for (const auto& drop_token_count : drop_token_counts) { |
|
for (size_t i = 0; i < drop_token_count.second; ++i) { |
|
auto* server = response.mutable_server_list()->add_servers(); |
|
server->set_drop(true); |
|
server->set_load_balance_token(drop_token_count.first); |
|
} |
|
} |
|
for (const int& backend_port : backend_ports) { |
|
auto* server = response.mutable_server_list()->add_servers(); |
|
server->set_ip_address(ipv6_only_ ? Ip6ToPackedString("::1") |
|
: Ip4ToPackedString("127.0.0.1")); |
|
server->set_port(backend_port); |
|
static int token_count = 0; |
|
server->set_load_balance_token( |
|
absl::StrFormat("token%03d", ++token_count)); |
|
} |
|
return response; |
|
} |
|
|
|
Status SendRpc(EchoResponse* response = nullptr, int timeout_ms = 1000, |
|
bool wait_for_ready = false, |
|
const Status& expected_status = Status::OK) { |
|
const bool local_response = (response == nullptr); |
|
if (local_response) response = new EchoResponse; |
|
EchoRequest request; |
|
request.set_message(kRequestMessage_); |
|
if (!expected_status.ok()) { |
|
auto* error = request.mutable_param()->mutable_expected_error(); |
|
error->set_code(expected_status.error_code()); |
|
error->set_error_message(expected_status.error_message()); |
|
} |
|
ClientContext context; |
|
context.set_deadline(grpc_timeout_milliseconds_to_deadline(timeout_ms)); |
|
if (wait_for_ready) context.set_wait_for_ready(true); |
|
Status status = stub_->Echo(&context, request, response); |
|
if (local_response) delete response; |
|
return status; |
|
} |
|
|
|
void CheckRpcSendOk(const size_t times = 1, const int timeout_ms = 1000, |
|
bool wait_for_ready = false) { |
|
for (size_t i = 0; i < times; ++i) { |
|
EchoResponse response; |
|
const Status status = SendRpc(&response, timeout_ms, wait_for_ready); |
|
EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
|
<< " message=" << status.error_message(); |
|
EXPECT_EQ(response.message(), kRequestMessage_); |
|
} |
|
} |
|
|
|
void CheckRpcSendFailure() { |
|
const Status status = SendRpc(); |
|
EXPECT_FALSE(status.ok()); |
|
} |
|
|
|
template <typename T> |
|
struct ServerThread { |
|
template <typename... Args> |
|
explicit ServerThread(const std::string& type, Args&&... args) |
|
: port_(grpc_pick_unused_port_or_die()), |
|
type_(type), |
|
service_(std::forward<Args>(args)...) {} |
|
|
|
void Start(const std::string& server_host) { |
|
gpr_log(GPR_INFO, "starting %s server on port %d", type_.c_str(), port_); |
|
GPR_ASSERT(!running_); |
|
running_ = true; |
|
service_.Start(); |
|
grpc::internal::Mutex mu; |
|
// We need to acquire the lock here in order to prevent the notify_one |
|
// by ServerThread::Serve from firing before the wait below is hit. |
|
grpc::internal::MutexLock lock(&mu); |
|
grpc::internal::CondVar cond; |
|
thread_ = absl::make_unique<std::thread>( |
|
std::bind(&ServerThread::Serve, this, server_host, &mu, &cond)); |
|
cond.Wait(&mu); |
|
gpr_log(GPR_INFO, "%s server startup complete", type_.c_str()); |
|
} |
|
|
|
void Serve(const std::string& server_host, grpc::internal::Mutex* mu, |
|
grpc::internal::CondVar* cond) { |
|
// We need to acquire the lock here in order to prevent the notify_one |
|
// below from firing before its corresponding wait is executed. |
|
grpc::internal::MutexLock lock(mu); |
|
std::ostringstream server_address; |
|
server_address << server_host << ":" << port_; |
|
ServerBuilder builder; |
|
std::shared_ptr<ServerCredentials> creds(new SecureServerCredentials( |
|
grpc_fake_transport_security_server_credentials_create())); |
|
builder.AddListeningPort(server_address.str(), creds); |
|
builder.RegisterService(&service_); |
|
server_ = builder.BuildAndStart(); |
|
cond->Signal(); |
|
} |
|
|
|
void Shutdown() { |
|
if (!running_) return; |
|
gpr_log(GPR_INFO, "%s about to shutdown", type_.c_str()); |
|
service_.Shutdown(); |
|
server_->Shutdown(grpc_timeout_milliseconds_to_deadline(0)); |
|
thread_->join(); |
|
gpr_log(GPR_INFO, "%s shutdown completed", type_.c_str()); |
|
running_ = false; |
|
} |
|
|
|
const int port_; |
|
std::string type_; |
|
T service_; |
|
std::unique_ptr<Server> server_; |
|
std::unique_ptr<std::thread> thread_; |
|
bool running_ = false; |
|
}; |
|
|
|
const std::string server_host_; |
|
const size_t num_backends_; |
|
const size_t num_balancers_; |
|
const int client_load_reporting_interval_seconds_; |
|
bool ipv6_only_ = false; |
|
std::shared_ptr<Channel> channel_; |
|
std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_; |
|
std::vector<std::unique_ptr<ServerThread<BackendServiceImpl>>> backends_; |
|
std::vector<std::unique_ptr<ServerThread<BalancerServiceImpl>>> balancers_; |
|
grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator> |
|
response_generator_; |
|
const std::string kRequestMessage_ = "Live long and prosper."; |
|
const std::string kApplicationTargetName_ = "application_target_name"; |
|
}; |
|
|
|
class SingleBalancerTest : public GrpclbEnd2endTest { |
|
public: |
|
SingleBalancerTest() : GrpclbEnd2endTest(4, 1, 0) {} |
|
}; |
|
|
|
TEST_F(SingleBalancerTest, Vanilla) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumRpcsPerAddress = 100; |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Make sure that trying to connect works without a call. |
|
channel_->GetState(true /* try_to_connect */); |
|
// We need to wait for all backends to come online. |
|
WaitForAllBackends(); |
|
// Send kNumRpcsPerAddress RPCs per server. |
|
CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
|
|
|
// Each backend should have gotten 100 requests. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(kNumRpcsPerAddress, backends_[i]->service_.request_count()); |
|
} |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
|
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SubchannelCaching) { |
|
ResetStub(/*fallback_timeout=*/0, /*expected_targets=*/"", |
|
/*subchannel_cache_delay_ms=*/1500); |
|
SetNextResolutionAllBalancers(); |
|
// Initially send all backends. |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Then remove backends 0 and 1. |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(2), {}), 1000); |
|
// Now re-add backend 1. |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(1), {}), 1000); |
|
// Wait for all backends to come online. |
|
WaitForAllBackends(); |
|
// Send RPCs for long enough to get all responses. |
|
gpr_timespec deadline = grpc_timeout_milliseconds_to_deadline(3000); |
|
do { |
|
CheckRpcSendOk(); |
|
} while (gpr_time_cmp(gpr_now(GPR_CLOCK_MONOTONIC), deadline) < 0); |
|
// Backend 0 should have received less traffic than the others. |
|
// Backend 1 would have received less traffic than 2 and 3. |
|
gpr_log(GPR_INFO, "BACKEND 0: %" PRIuPTR " requests", |
|
backends_[0]->service_.request_count()); |
|
EXPECT_GT(backends_[0]->service_.request_count(), 0); |
|
for (size_t i = 1; i < backends_.size(); ++i) { |
|
gpr_log(GPR_INFO, "BACKEND %" PRIuPTR ": %" PRIuPTR " requests", i, |
|
backends_[i]->service_.request_count()); |
|
EXPECT_GT(backends_[i]->service_.request_count(), |
|
backends_[0]->service_.request_count()) |
|
<< "backend " << i; |
|
if (i >= 2) { |
|
EXPECT_GT(backends_[i]->service_.request_count(), |
|
backends_[1]->service_.request_count()) |
|
<< "backend " << i; |
|
} |
|
} |
|
// Backend 1 should never have lost its connection from the client. |
|
EXPECT_EQ(1UL, backends_[1]->service_.clients().size()); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// And sent 3 responses. |
|
EXPECT_EQ(3U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, ReturnServerStatus) { |
|
SetNextResolutionAllBalancers(); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// We need to wait for all backends to come online. |
|
WaitForAllBackends(); |
|
// Send a request that the backend will fail, and make sure we get |
|
// back the right status. |
|
Status expected(StatusCode::INVALID_ARGUMENT, "He's dead, Jim!"); |
|
Status actual = SendRpc(/*response=*/nullptr, /*timeout_ms=*/1000, |
|
/*wait_for_ready=*/false, expected); |
|
EXPECT_EQ(actual.error_code(), expected.error_code()); |
|
EXPECT_EQ(actual.error_message(), expected.error_message()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SelectGrpclbWithMigrationServiceConfig) { |
|
SetNextResolutionAllBalancers( |
|
"{\n" |
|
" \"loadBalancingConfig\":[\n" |
|
" { \"does_not_exist\":{} },\n" |
|
" { \"grpclb\":{} }\n" |
|
" ]\n" |
|
"}"); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
CheckRpcSendOk(1, 1000 /* timeout_ms */, true /* wait_for_ready */); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, |
|
SelectGrpclbWithMigrationServiceConfigAndNoAddresses) { |
|
const int kFallbackTimeoutMs = 200 * grpc_test_slowdown_factor(); |
|
ResetStub(kFallbackTimeoutMs); |
|
SetNextResolution({}, {}, |
|
"{\n" |
|
" \"loadBalancingConfig\":[\n" |
|
" { \"does_not_exist\":{} },\n" |
|
" { \"grpclb\":{} }\n" |
|
" ]\n" |
|
"}"); |
|
// Try to connect. |
|
EXPECT_EQ(GRPC_CHANNEL_IDLE, channel_->GetState(true)); |
|
// Should go into state TRANSIENT_FAILURE when we enter fallback mode. |
|
const gpr_timespec deadline = grpc_timeout_seconds_to_deadline(1); |
|
grpc_connectivity_state state; |
|
while ((state = channel_->GetState(false)) != |
|
GRPC_CHANNEL_TRANSIENT_FAILURE) { |
|
ASSERT_TRUE(channel_->WaitForStateChange(state, deadline)); |
|
} |
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, UsePickFirstChildPolicy) { |
|
SetNextResolutionAllBalancers( |
|
"{\n" |
|
" \"loadBalancingConfig\":[\n" |
|
" { \"grpclb\":{\n" |
|
" \"childPolicy\":[\n" |
|
" { \"pick_first\":{} }\n" |
|
" ]\n" |
|
" } }\n" |
|
" ]\n" |
|
"}"); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
const size_t kNumRpcs = num_backends_ * 2; |
|
CheckRpcSendOk(kNumRpcs, 1000 /* timeout_ms */, true /* wait_for_ready */); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// Check that all requests went to the first backend. This verifies |
|
// that we used pick_first instead of round_robin as the child policy. |
|
EXPECT_EQ(backends_[0]->service_.request_count(), kNumRpcs); |
|
for (size_t i = 1; i < backends_.size(); ++i) { |
|
EXPECT_EQ(backends_[i]->service_.request_count(), 0UL); |
|
} |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SwapChildPolicy) { |
|
SetNextResolutionAllBalancers( |
|
"{\n" |
|
" \"loadBalancingConfig\":[\n" |
|
" { \"grpclb\":{\n" |
|
" \"childPolicy\":[\n" |
|
" { \"pick_first\":{} }\n" |
|
" ]\n" |
|
" } }\n" |
|
" ]\n" |
|
"}"); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
const size_t kNumRpcs = num_backends_ * 2; |
|
CheckRpcSendOk(kNumRpcs, 1000 /* timeout_ms */, true /* wait_for_ready */); |
|
// Check that all requests went to the first backend. This verifies |
|
// that we used pick_first instead of round_robin as the child policy. |
|
EXPECT_EQ(backends_[0]->service_.request_count(), kNumRpcs); |
|
for (size_t i = 1; i < backends_.size(); ++i) { |
|
EXPECT_EQ(backends_[i]->service_.request_count(), 0UL); |
|
} |
|
// Send new resolution that removes child policy from service config. |
|
SetNextResolutionAllBalancers(); |
|
WaitForAllBackends(); |
|
CheckRpcSendOk(kNumRpcs, 1000 /* timeout_ms */, true /* wait_for_ready */); |
|
// Check that every backend saw the same number of requests. This verifies |
|
// that we used round_robin. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(backends_[i]->service_.request_count(), 2UL); |
|
} |
|
// Done. |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SameBackendListedMultipleTimes) { |
|
SetNextResolutionAllBalancers(); |
|
// Same backend listed twice. |
|
std::vector<int> ports; |
|
ports.push_back(backends_[0]->port_); |
|
ports.push_back(backends_[0]->port_); |
|
const size_t kNumRpcsPerAddress = 10; |
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(ports, {}), 0); |
|
// We need to wait for the backend to come online. |
|
WaitForBackend(0); |
|
// Send kNumRpcsPerAddress RPCs per server. |
|
CheckRpcSendOk(kNumRpcsPerAddress * ports.size()); |
|
// Backend should have gotten 20 requests. |
|
EXPECT_EQ(kNumRpcsPerAddress * 2, backends_[0]->service_.request_count()); |
|
// And they should have come from a single client port, because of |
|
// subchannel sharing. |
|
EXPECT_EQ(1UL, backends_[0]->service_.clients().size()); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SecureNaming) { |
|
ResetStub(0, kApplicationTargetName_ + ";lb"); |
|
SetNextResolution({AddressData{balancers_[0]->port_, "lb"}}); |
|
const size_t kNumRpcsPerAddress = 100; |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Make sure that trying to connect works without a call. |
|
channel_->GetState(true /* try_to_connect */); |
|
// We need to wait for all backends to come online. |
|
WaitForAllBackends(); |
|
// Send kNumRpcsPerAddress RPCs per server. |
|
CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
|
|
|
// Each backend should have gotten 100 requests. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(kNumRpcsPerAddress, backends_[i]->service_.request_count()); |
|
} |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// Check LB policy name for the channel. |
|
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, SecureNamingDeathTest) { |
|
GTEST_FLAG_SET(death_test_style, "threadsafe"); |
|
// Make sure that we blow up (via abort() from the security connector) when |
|
// the name from the balancer doesn't match expectations. |
|
ASSERT_DEATH_IF_SUPPORTED( |
|
{ |
|
ResetStub(0, kApplicationTargetName_ + ";lb"); |
|
SetNextResolution({AddressData{balancers_[0]->port_, "woops"}}); |
|
channel_->WaitForConnected(grpc_timeout_seconds_to_deadline(1)); |
|
}, |
|
""); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, InitiallyEmptyServerlist) { |
|
SetNextResolutionAllBalancers(); |
|
const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
|
const int kCallDeadlineMs = kServerlistDelayMs * 10; |
|
// First response is an empty serverlist, sent right away. |
|
ScheduleResponseForBalancer(0, LoadBalanceResponse(), 0); |
|
// Send non-empty serverlist only after kServerlistDelayMs |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), kServerlistDelayMs); |
|
const auto t0 = system_clock::now(); |
|
// Client will block: LB will initially send empty serverlist. |
|
CheckRpcSendOk(1, kCallDeadlineMs, true /* wait_for_ready */); |
|
const auto ellapsed_ms = |
|
std::chrono::duration_cast<std::chrono::milliseconds>( |
|
system_clock::now() - t0); |
|
// but eventually, the LB sends a serverlist update that allows the call to |
|
// proceed. The call delay must be larger than the delay in sending the |
|
// populated serverlist but under the call's deadline (which is enforced by |
|
// the call's deadline). |
|
EXPECT_GT(ellapsed_ms.count(), kServerlistDelayMs); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent two responses. |
|
EXPECT_EQ(2U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, AllServersUnreachableFailFast) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumUnreachableServers = 5; |
|
std::vector<int> ports; |
|
for (size_t i = 0; i < kNumUnreachableServers; ++i) { |
|
ports.push_back(grpc_pick_unused_port_or_die()); |
|
} |
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(ports, {}), 0); |
|
const Status status = SendRpc(); |
|
// The error shouldn't be DEADLINE_EXCEEDED. |
|
EXPECT_EQ(StatusCode::UNAVAILABLE, status.error_code()); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, Fallback) { |
|
SetNextResolutionAllBalancers(); |
|
const int kFallbackTimeoutMs = 200 * grpc_test_slowdown_factor(); |
|
const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
|
const size_t kNumBackendsInResolution = backends_.size() / 2; |
|
|
|
ResetStub(kFallbackTimeoutMs); |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
backend_addresses.emplace_back(AddressData{backends_[i]->port_, ""}); |
|
} |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
|
|
// Send non-empty serverlist only after kServerlistDelayMs. |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
GetBackendPorts(kNumBackendsInResolution /* start_index */), {}), |
|
kServerlistDelayMs); |
|
|
|
// Wait until all the fallback backends are reachable. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
WaitForBackend(i); |
|
} |
|
|
|
// The first request. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(kNumBackendsInResolution); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
|
|
// Fallback is used: each backend returned by the resolver should have |
|
// gotten one request. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
EXPECT_EQ(1U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution; i < backends_.size(); ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
|
|
// Wait until the serverlist reception has been processed and all backends |
|
// in the serverlist are reachable. |
|
for (size_t i = kNumBackendsInResolution; i < backends_.size(); ++i) { |
|
WaitForBackend(i); |
|
} |
|
|
|
// Send out the second request. |
|
gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
|
CheckRpcSendOk(backends_.size() - kNumBackendsInResolution); |
|
gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
|
|
|
// Serverlist is used: each backend returned by the balancer should |
|
// have gotten one request. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution; i < backends_.size(); ++i) { |
|
EXPECT_EQ(1U, backends_[i]->service_.request_count()); |
|
} |
|
|
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, FallbackUpdate) { |
|
SetNextResolutionAllBalancers(); |
|
const int kFallbackTimeoutMs = 200 * grpc_test_slowdown_factor(); |
|
const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor(); |
|
const size_t kNumBackendsInResolution = backends_.size() / 3; |
|
const size_t kNumBackendsInResolutionUpdate = backends_.size() / 3; |
|
|
|
ResetStub(kFallbackTimeoutMs); |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
backend_addresses.emplace_back(AddressData{backends_[i]->port_, ""}); |
|
} |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
|
|
// Send non-empty serverlist only after kServerlistDelayMs. |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
GetBackendPorts(kNumBackendsInResolution + |
|
kNumBackendsInResolutionUpdate /* start_index */), |
|
{}), |
|
kServerlistDelayMs); |
|
|
|
// Wait until all the fallback backends are reachable. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
WaitForBackend(i); |
|
} |
|
|
|
// The first request. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(kNumBackendsInResolution); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
|
|
// Fallback is used: each backend returned by the resolver should have |
|
// gotten one request. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
EXPECT_EQ(1U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution; i < backends_.size(); ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
|
|
balancer_addresses.clear(); |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
backend_addresses.clear(); |
|
for (size_t i = kNumBackendsInResolution; |
|
i < kNumBackendsInResolution + kNumBackendsInResolutionUpdate; ++i) { |
|
backend_addresses.emplace_back(AddressData{backends_[i]->port_, ""}); |
|
} |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
|
|
// Wait until the resolution update has been processed and all the new |
|
// fallback backends are reachable. |
|
for (size_t i = kNumBackendsInResolution; |
|
i < kNumBackendsInResolution + kNumBackendsInResolutionUpdate; ++i) { |
|
WaitForBackend(i); |
|
} |
|
|
|
// Send out the second request. |
|
gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
|
CheckRpcSendOk(kNumBackendsInResolutionUpdate); |
|
gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
|
|
|
// The resolution update is used: each backend in the resolution update should |
|
// have gotten one request. |
|
for (size_t i = 0; i < kNumBackendsInResolution; ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution; |
|
i < kNumBackendsInResolution + kNumBackendsInResolutionUpdate; ++i) { |
|
EXPECT_EQ(1U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution + kNumBackendsInResolutionUpdate; |
|
i < backends_.size(); ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
|
|
// Wait until the serverlist reception has been processed and all backends |
|
// in the serverlist are reachable. |
|
for (size_t i = kNumBackendsInResolution + kNumBackendsInResolutionUpdate; |
|
i < backends_.size(); ++i) { |
|
WaitForBackend(i); |
|
} |
|
|
|
// Send out the third request. |
|
gpr_log(GPR_INFO, "========= BEFORE THIRD BATCH =========="); |
|
CheckRpcSendOk(backends_.size() - kNumBackendsInResolution - |
|
kNumBackendsInResolutionUpdate); |
|
gpr_log(GPR_INFO, "========= DONE WITH THIRD BATCH =========="); |
|
|
|
// Serverlist is used: each backend returned by the balancer should |
|
// have gotten one request. |
|
for (size_t i = 0; |
|
i < kNumBackendsInResolution + kNumBackendsInResolutionUpdate; ++i) { |
|
EXPECT_EQ(0U, backends_[i]->service_.request_count()); |
|
} |
|
for (size_t i = kNumBackendsInResolution + kNumBackendsInResolutionUpdate; |
|
i < backends_.size(); ++i) { |
|
EXPECT_EQ(1U, backends_[i]->service_.request_count()); |
|
} |
|
|
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, |
|
FallbackAfterStartup_LoseContactWithBalancerThenBackends) { |
|
// First two backends are fallback, last two are pointed to by balancer. |
|
const size_t kNumFallbackBackends = 2; |
|
const size_t kNumBalancerBackends = backends_.size() - kNumFallbackBackends; |
|
std::vector<AddressData> backend_addresses; |
|
for (size_t i = 0; i < kNumFallbackBackends; ++i) { |
|
backend_addresses.emplace_back(AddressData{backends_[i]->port_, ""}); |
|
} |
|
std::vector<AddressData> balancer_addresses; |
|
for (size_t i = 0; i < balancers_.size(); ++i) { |
|
balancer_addresses.emplace_back(AddressData{balancers_[i]->port_, ""}); |
|
} |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(kNumFallbackBackends), {}), |
|
0); |
|
// Try to connect. |
|
channel_->GetState(true /* try_to_connect */); |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, |
|
kNumFallbackBackends /* start_index */); |
|
// Stop balancer. RPCs should continue going to backends from balancer. |
|
balancers_[0]->Shutdown(); |
|
CheckRpcSendOk(100 * kNumBalancerBackends); |
|
for (size_t i = kNumFallbackBackends; i < backends_.size(); ++i) { |
|
EXPECT_EQ(100UL, backends_[i]->service_.request_count()); |
|
} |
|
// Stop backends from balancer. This should put us in fallback mode. |
|
for (size_t i = kNumFallbackBackends; i < backends_.size(); ++i) { |
|
ShutdownBackend(i); |
|
} |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, 0 /* start_index */, |
|
kNumFallbackBackends /* stop_index */); |
|
// Restart the backends from the balancer. We should *not* start |
|
// sending traffic back to them at this point (although the behavior |
|
// in xds may be different). |
|
for (size_t i = kNumFallbackBackends; i < backends_.size(); ++i) { |
|
StartBackend(i); |
|
} |
|
CheckRpcSendOk(100 * kNumBalancerBackends); |
|
for (size_t i = 0; i < kNumFallbackBackends; ++i) { |
|
EXPECT_EQ(100UL, backends_[i]->service_.request_count()); |
|
} |
|
// Now start the balancer again. This should cause us to exit |
|
// fallback mode. |
|
balancers_[0]->Start(server_host_); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(kNumFallbackBackends), {}), |
|
0); |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, |
|
kNumFallbackBackends /* start_index */); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, |
|
FallbackAfterStartup_LoseContactWithBackendsThenBalancer) { |
|
// First two backends are fallback, last two are pointed to by balancer. |
|
const size_t kNumFallbackBackends = 2; |
|
const size_t kNumBalancerBackends = backends_.size() - kNumFallbackBackends; |
|
std::vector<AddressData> backend_addresses; |
|
for (size_t i = 0; i < kNumFallbackBackends; ++i) { |
|
backend_addresses.emplace_back(AddressData{backends_[i]->port_, ""}); |
|
} |
|
std::vector<AddressData> balancer_addresses; |
|
for (size_t i = 0; i < balancers_.size(); ++i) { |
|
balancer_addresses.emplace_back(AddressData{balancers_[i]->port_, ""}); |
|
} |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(kNumFallbackBackends), {}), |
|
0); |
|
// Try to connect. |
|
channel_->GetState(true /* try_to_connect */); |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, |
|
kNumFallbackBackends /* start_index */); |
|
// Stop backends from balancer. Since we are still in contact with |
|
// the balancer at this point, RPCs should be failing. |
|
for (size_t i = kNumFallbackBackends; i < backends_.size(); ++i) { |
|
ShutdownBackend(i); |
|
} |
|
CheckRpcSendFailure(); |
|
// Stop balancer. This should put us in fallback mode. |
|
balancers_[0]->Shutdown(); |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, 0 /* start_index */, |
|
kNumFallbackBackends /* stop_index */); |
|
// Restart the backends from the balancer. We should *not* start |
|
// sending traffic back to them at this point (although the behavior |
|
// in xds may be different). |
|
for (size_t i = kNumFallbackBackends; i < backends_.size(); ++i) { |
|
StartBackend(i); |
|
} |
|
CheckRpcSendOk(100 * kNumBalancerBackends); |
|
for (size_t i = 0; i < kNumFallbackBackends; ++i) { |
|
EXPECT_EQ(100UL, backends_[i]->service_.request_count()); |
|
} |
|
// Now start the balancer again. This should cause us to exit |
|
// fallback mode. |
|
balancers_[0]->Start(server_host_); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(kNumFallbackBackends), {}), |
|
0); |
|
WaitForAllBackends(1 /* num_requests_multiple_of */, |
|
kNumFallbackBackends /* start_index */); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, FallbackEarlyWhenBalancerChannelFails) { |
|
const int kFallbackTimeoutMs = 10000 * grpc_test_slowdown_factor(); |
|
ResetStub(kFallbackTimeoutMs); |
|
// Return an unreachable balancer and one fallback backend. |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back( |
|
AddressData{grpc_pick_unused_port_or_die(), ""}); |
|
std::vector<AddressData> backend_addresses; |
|
backend_addresses.emplace_back(AddressData{backends_[0]->port_, ""}); |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
// Send RPC with deadline less than the fallback timeout and make sure it |
|
// succeeds. |
|
CheckRpcSendOk(/* times */ 1, /* timeout_ms */ 1000, |
|
/* wait_for_ready */ false); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, FallbackEarlyWhenBalancerCallFails) { |
|
const int kFallbackTimeoutMs = 10000 * grpc_test_slowdown_factor(); |
|
ResetStub(kFallbackTimeoutMs); |
|
// Return one balancer and one fallback backend. |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
backend_addresses.emplace_back(AddressData{backends_[0]->port_, ""}); |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
// Balancer drops call without sending a serverlist. |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// Send RPC with deadline less than the fallback timeout and make sure it |
|
// succeeds. |
|
CheckRpcSendOk(/* times */ 1, /* timeout_ms */ 1000, |
|
/* wait_for_ready */ false); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, FallbackControlledByBalancer_BeforeFirstServerlist) { |
|
const int kFallbackTimeoutMs = 10000 * grpc_test_slowdown_factor(); |
|
ResetStub(kFallbackTimeoutMs); |
|
// Return one balancer and one fallback backend. |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
backend_addresses.emplace_back(AddressData{backends_[0]->port_, ""}); |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
// Balancer explicitly tells client to fallback. |
|
LoadBalanceResponse resp; |
|
resp.mutable_fallback_response(); |
|
ScheduleResponseForBalancer(0, resp, 0); |
|
// Send RPC with deadline less than the fallback timeout and make sure it |
|
// succeeds. |
|
CheckRpcSendOk(/* times */ 1, /* timeout_ms */ 1000, |
|
/* wait_for_ready */ false); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, FallbackControlledByBalancer_AfterFirstServerlist) { |
|
// Return one balancer and one fallback backend (backend 0). |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
backend_addresses.emplace_back(AddressData{backends_[0]->port_, ""}); |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
// Balancer initially sends serverlist, then tells client to fall back, |
|
// then sends the serverlist again. |
|
// The serverlist points to backend 1. |
|
LoadBalanceResponse serverlist_resp = |
|
BuildResponseForBackends({backends_[1]->port_}, {}); |
|
LoadBalanceResponse fallback_resp; |
|
fallback_resp.mutable_fallback_response(); |
|
ScheduleResponseForBalancer(0, serverlist_resp, 0); |
|
ScheduleResponseForBalancer(0, fallback_resp, 100); |
|
ScheduleResponseForBalancer(0, serverlist_resp, 100); |
|
// Requests initially go to backend 1, then go to backend 0 in |
|
// fallback mode, then go back to backend 1 when we exit fallback. |
|
WaitForBackend(1); |
|
WaitForBackend(0); |
|
WaitForBackend(1); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, BackendsRestart) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumRpcsPerAddress = 100; |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Make sure that trying to connect works without a call. |
|
channel_->GetState(true /* try_to_connect */); |
|
// Send kNumRpcsPerAddress RPCs per server. |
|
CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
|
// Stop backends. RPCs should fail. |
|
ShutdownAllBackends(); |
|
CheckRpcSendFailure(); |
|
// Restart backends. RPCs should start succeeding again. |
|
StartAllBackends(); |
|
CheckRpcSendOk(1 /* times */, 2000 /* timeout_ms */, |
|
true /* wait_for_ready */); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, ServiceNameFromLbPolicyConfig) { |
|
constexpr char kServiceConfigWithTarget[] = |
|
"{\n" |
|
" \"loadBalancingConfig\":[\n" |
|
" { \"grpclb\":{\n" |
|
" \"serviceName\":\"test_service\"\n" |
|
" }}\n" |
|
" ]\n" |
|
"}"; |
|
|
|
SetNextResolutionAllBalancers(kServiceConfigWithTarget); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Make sure that trying to connect works without a call. |
|
channel_->GetState(true /* try_to_connect */); |
|
// We need to wait for all backends to come online. |
|
WaitForAllBackends(); |
|
EXPECT_EQ(balancers_[0]->service_.service_names().back(), "test_service"); |
|
} |
|
|
|
class UpdatesTest : public GrpclbEnd2endTest { |
|
public: |
|
UpdatesTest() : GrpclbEnd2endTest(4, 3, 0) {} |
|
}; |
|
|
|
TEST_F(UpdatesTest, UpdateBalancersButKeepUsingOriginalBalancer) { |
|
SetNextResolutionAllBalancers(); |
|
const std::vector<int> first_backend{GetBackendPorts()[0]}; |
|
const std::vector<int> second_backend{GetBackendPorts()[1]}; |
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(first_backend, {}), |
|
0); |
|
ScheduleResponseForBalancer(1, BuildResponseForBackends(second_backend, {}), |
|
0); |
|
|
|
// Wait until the first backend is ready. |
|
WaitForBackend(0); |
|
|
|
// Send 10 requests. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
|
|
// All 10 requests should have gone to the first backend. |
|
EXPECT_EQ(10U, backends_[0]->service_.request_count()); |
|
|
|
// Balancer 0 got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
|
|
std::vector<AddressData> addresses; |
|
addresses.emplace_back(AddressData{balancers_[1]->port_, ""}); |
|
gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
|
SetNextResolution(addresses); |
|
gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
|
|
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
gpr_timespec deadline = gpr_time_add( |
|
gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(10000, GPR_TIMESPAN)); |
|
// Send 10 seconds worth of RPCs |
|
do { |
|
CheckRpcSendOk(); |
|
} while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0); |
|
// The current LB call is still working, so grpclb continued using it to the |
|
// first balancer, which doesn't assign the second backend. |
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
|
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
} |
|
|
|
// Send an update with the same set of LBs as the one in SetUp() in order to |
|
// verify that the LB channel inside grpclb keeps the initial connection (which |
|
// by definition is also present in the update). |
|
TEST_F(UpdatesTest, UpdateBalancersRepeated) { |
|
SetNextResolutionAllBalancers(); |
|
const std::vector<int> first_backend{GetBackendPorts()[0]}; |
|
const std::vector<int> second_backend{GetBackendPorts()[0]}; |
|
|
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(first_backend, {}), |
|
0); |
|
ScheduleResponseForBalancer(1, BuildResponseForBackends(second_backend, {}), |
|
0); |
|
|
|
// Wait until the first backend is ready. |
|
WaitForBackend(0); |
|
|
|
// Send 10 requests. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
|
|
// All 10 requests should have gone to the first backend. |
|
EXPECT_EQ(10U, backends_[0]->service_.request_count()); |
|
|
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// Balancer 0 got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
|
|
std::vector<AddressData> addresses; |
|
addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
addresses.emplace_back(AddressData{balancers_[1]->port_, ""}); |
|
addresses.emplace_back(AddressData{balancers_[2]->port_, ""}); |
|
gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
|
SetNextResolution(addresses); |
|
gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
|
|
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
gpr_timespec deadline = gpr_time_add( |
|
gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(10000, GPR_TIMESPAN)); |
|
// Send 10 seconds worth of RPCs |
|
do { |
|
CheckRpcSendOk(); |
|
} while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0); |
|
// grpclb continued using the original LB call to the first balancer, which |
|
// doesn't assign the second backend. |
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
|
|
addresses.clear(); |
|
addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
addresses.emplace_back(AddressData{balancers_[1]->port_, ""}); |
|
gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 2 =========="); |
|
SetNextResolution(addresses); |
|
gpr_log(GPR_INFO, "========= UPDATE 2 DONE =========="); |
|
|
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
deadline = gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
|
gpr_time_from_millis(10000, GPR_TIMESPAN)); |
|
// Send 10 seconds worth of RPCs |
|
do { |
|
CheckRpcSendOk(); |
|
} while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0); |
|
// grpclb continued using the original LB call to the first balancer, which |
|
// doesn't assign the second backend. |
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
} |
|
|
|
TEST_F(UpdatesTest, UpdateBalancersDeadUpdate) { |
|
std::vector<AddressData> addresses; |
|
addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
SetNextResolution(addresses); |
|
const std::vector<int> first_backend{GetBackendPorts()[0]}; |
|
const std::vector<int> second_backend{GetBackendPorts()[1]}; |
|
|
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(first_backend, {}), |
|
0); |
|
ScheduleResponseForBalancer(1, BuildResponseForBackends(second_backend, {}), |
|
0); |
|
|
|
// Start servers and send 10 RPCs per server. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
// All 10 requests should have gone to the first backend. |
|
EXPECT_EQ(10U, backends_[0]->service_.request_count()); |
|
|
|
// Kill balancer 0 |
|
gpr_log(GPR_INFO, "********** ABOUT TO KILL BALANCER 0 *************"); |
|
balancers_[0]->Shutdown(); |
|
gpr_log(GPR_INFO, "********** KILLED BALANCER 0 *************"); |
|
|
|
// This is serviced by the existing RR policy |
|
gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
|
// All 10 requests should again have gone to the first backend. |
|
EXPECT_EQ(20U, backends_[0]->service_.request_count()); |
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
|
|
// Balancer 0 got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
|
|
addresses.clear(); |
|
addresses.emplace_back(AddressData{balancers_[1]->port_, ""}); |
|
gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 =========="); |
|
SetNextResolution(addresses); |
|
gpr_log(GPR_INFO, "========= UPDATE 1 DONE =========="); |
|
|
|
// Wait until update has been processed, as signaled by the second backend |
|
// receiving a request. In the meantime, the client continues to be serviced |
|
// (by the first backend) without interruption. |
|
EXPECT_EQ(0U, backends_[1]->service_.request_count()); |
|
WaitForBackend(1); |
|
|
|
// This is serviced by the updated RR policy |
|
backends_[1]->service_.ResetCounters(); |
|
gpr_log(GPR_INFO, "========= BEFORE THIRD BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH THIRD BATCH =========="); |
|
// All 10 requests should have gone to the second backend. |
|
EXPECT_EQ(10U, backends_[1]->service_.request_count()); |
|
|
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// The second balancer, published as part of the first update, may end up |
|
// getting two requests (that is, 1 <= #req <= 2) if the LB call retry timer |
|
// firing races with the arrival of the update containing the second |
|
// balancer. |
|
EXPECT_GE(balancers_[1]->service_.request_count(), 1U); |
|
EXPECT_GE(balancers_[1]->service_.response_count(), 1U); |
|
EXPECT_LE(balancers_[1]->service_.request_count(), 2U); |
|
EXPECT_LE(balancers_[1]->service_.response_count(), 2U); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
} |
|
|
|
TEST_F(UpdatesTest, ReresolveDeadBackend) { |
|
ResetStub(500); |
|
// The first resolution contains the addresses of a balancer that never |
|
// responds, and a fallback backend. |
|
std::vector<AddressData> balancer_addresses; |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
std::vector<AddressData> backend_addresses; |
|
backend_addresses.emplace_back(AddressData{backends_[0]->port_, ""}); |
|
SetNextResolution(balancer_addresses, backend_addresses); |
|
// Ask channel to connect to trigger resolver creation. |
|
channel_->GetState(true); |
|
// The re-resolution result will contain the addresses of the same balancer |
|
// and a new fallback backend. |
|
balancer_addresses.clear(); |
|
balancer_addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
backend_addresses.clear(); |
|
backend_addresses.emplace_back(AddressData{backends_[1]->port_, ""}); |
|
SetNextReresolutionResponse(balancer_addresses, backend_addresses); |
|
|
|
// Start servers and send 10 RPCs per server. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
// All 10 requests should have gone to the fallback backend. |
|
EXPECT_EQ(10U, backends_[0]->service_.request_count()); |
|
|
|
// Kill backend 0. |
|
gpr_log(GPR_INFO, "********** ABOUT TO KILL BACKEND 0 *************"); |
|
backends_[0]->Shutdown(); |
|
gpr_log(GPR_INFO, "********** KILLED BACKEND 0 *************"); |
|
|
|
// Wait until re-resolution has finished, as signaled by the second backend |
|
// receiving a request. |
|
WaitForBackend(1); |
|
|
|
gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
|
// All 10 requests should have gone to the second backend. |
|
EXPECT_EQ(10U, backends_[1]->service_.request_count()); |
|
|
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
balancers_[1]->service_.NotifyDoneWithServerlists(); |
|
balancers_[2]->service_.NotifyDoneWithServerlists(); |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
} |
|
|
|
// TODO(juanlishen): Should be removed when the first response is always the |
|
// initial response. Currently, if client load reporting is not enabled, the |
|
// balancer doesn't send initial response. When the backend shuts down, an |
|
// unexpected re-resolution will happen. This test configuration is a workaround |
|
// for test ReresolveDeadBalancer. |
|
class UpdatesWithClientLoadReportingTest : public GrpclbEnd2endTest { |
|
public: |
|
UpdatesWithClientLoadReportingTest() : GrpclbEnd2endTest(4, 3, 2) {} |
|
}; |
|
|
|
TEST_F(UpdatesWithClientLoadReportingTest, ReresolveDeadBalancer) { |
|
const std::vector<int> first_backend{GetBackendPorts()[0]}; |
|
const std::vector<int> second_backend{GetBackendPorts()[1]}; |
|
ScheduleResponseForBalancer(0, BuildResponseForBackends(first_backend, {}), |
|
0); |
|
ScheduleResponseForBalancer(1, BuildResponseForBackends(second_backend, {}), |
|
0); |
|
|
|
// Ask channel to connect to trigger resolver creation. |
|
channel_->GetState(true); |
|
std::vector<AddressData> addresses; |
|
addresses.emplace_back(AddressData{balancers_[0]->port_, ""}); |
|
SetNextResolution(addresses); |
|
addresses.clear(); |
|
addresses.emplace_back(AddressData{balancers_[1]->port_, ""}); |
|
SetNextReresolutionResponse(addresses); |
|
|
|
// Start servers and send 10 RPCs per server. |
|
gpr_log(GPR_INFO, "========= BEFORE FIRST BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH FIRST BATCH =========="); |
|
// All 10 requests should have gone to the first backend. |
|
EXPECT_EQ(10U, backends_[0]->service_.request_count()); |
|
|
|
// Kill backend 0. |
|
gpr_log(GPR_INFO, "********** ABOUT TO KILL BACKEND 0 *************"); |
|
backends_[0]->Shutdown(); |
|
gpr_log(GPR_INFO, "********** KILLED BACKEND 0 *************"); |
|
|
|
CheckRpcSendFailure(); |
|
|
|
// Balancer 0 got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[1]->service_.response_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
|
|
// Kill balancer 0. |
|
gpr_log(GPR_INFO, "********** ABOUT TO KILL BALANCER 0 *************"); |
|
balancers_[0]->Shutdown(); |
|
gpr_log(GPR_INFO, "********** KILLED BALANCER 0 *************"); |
|
|
|
// Wait until re-resolution has finished, as signaled by the second backend |
|
// receiving a request. |
|
WaitForBackend(1); |
|
|
|
// This is serviced by the new serverlist. |
|
gpr_log(GPR_INFO, "========= BEFORE SECOND BATCH =========="); |
|
CheckRpcSendOk(10); |
|
gpr_log(GPR_INFO, "========= DONE WITH SECOND BATCH =========="); |
|
// All 10 requests should have gone to the second backend. |
|
EXPECT_EQ(10U, backends_[1]->service_.request_count()); |
|
|
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
// After balancer 0 is killed, we restart an LB call immediately (because we |
|
// disconnect to a previously connected balancer). Although we will cancel |
|
// this call when the re-resolution update is done and another LB call restart |
|
// is needed, this old call may still succeed reaching the LB server if |
|
// re-resolution is slow. So balancer 1 may have received 2 requests and sent |
|
// 2 responses. |
|
EXPECT_GE(balancers_[1]->service_.request_count(), 1U); |
|
EXPECT_GE(balancers_[1]->service_.response_count(), 1U); |
|
EXPECT_LE(balancers_[1]->service_.request_count(), 2U); |
|
EXPECT_LE(balancers_[1]->service_.response_count(), 2U); |
|
EXPECT_EQ(0U, balancers_[2]->service_.request_count()); |
|
EXPECT_EQ(0U, balancers_[2]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, Drop) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumRpcsPerAddress = 100; |
|
const int num_of_drop_by_rate_limiting_addresses = 1; |
|
const int num_of_drop_by_load_balancing_addresses = 2; |
|
const int num_of_drop_addresses = num_of_drop_by_rate_limiting_addresses + |
|
num_of_drop_by_load_balancing_addresses; |
|
const int num_total_addresses = num_backends_ + num_of_drop_addresses; |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
GetBackendPorts(), |
|
{{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
|
{"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
|
0); |
|
// Wait until all backends are ready. |
|
WaitForAllBackends(); |
|
// Send kNumRpcsPerAddress RPCs for each server and drop address. |
|
size_t num_drops = 0; |
|
for (size_t i = 0; i < kNumRpcsPerAddress * num_total_addresses; ++i) { |
|
EchoResponse response; |
|
const Status status = SendRpc(&response); |
|
if (!status.ok() && |
|
status.error_message() == "drop directed by grpclb balancer") { |
|
++num_drops; |
|
} else { |
|
EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
|
<< " message=" << status.error_message(); |
|
EXPECT_EQ(response.message(), kRequestMessage_); |
|
} |
|
} |
|
EXPECT_EQ(kNumRpcsPerAddress * num_of_drop_addresses, num_drops); |
|
// Each backend should have gotten 100 requests. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(kNumRpcsPerAddress, backends_[i]->service_.request_count()); |
|
} |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, DropAllFirst) { |
|
SetNextResolutionAllBalancers(); |
|
// All registered addresses are marked as "drop". |
|
const int num_of_drop_by_rate_limiting_addresses = 1; |
|
const int num_of_drop_by_load_balancing_addresses = 1; |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
{}, {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
|
{"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
|
0); |
|
const Status status = SendRpc(nullptr, 1000, true); |
|
EXPECT_FALSE(status.ok()); |
|
EXPECT_EQ(status.error_message(), "drop directed by grpclb balancer"); |
|
} |
|
|
|
TEST_F(SingleBalancerTest, DropAll) { |
|
SetNextResolutionAllBalancers(); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
const int num_of_drop_by_rate_limiting_addresses = 1; |
|
const int num_of_drop_by_load_balancing_addresses = 1; |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
{}, {{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
|
{"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
|
1000); |
|
|
|
// First call succeeds. |
|
CheckRpcSendOk(); |
|
// But eventually, the update with only dropped servers is processed and calls |
|
// fail. |
|
Status status; |
|
do { |
|
status = SendRpc(nullptr, 1000, true); |
|
} while (status.ok()); |
|
EXPECT_FALSE(status.ok()); |
|
EXPECT_EQ(status.error_message(), "drop directed by grpclb balancer"); |
|
} |
|
|
|
class SingleBalancerWithClientLoadReportingTest : public GrpclbEnd2endTest { |
|
public: |
|
SingleBalancerWithClientLoadReportingTest() : GrpclbEnd2endTest(4, 1, 3) {} |
|
}; |
|
|
|
TEST_F(SingleBalancerWithClientLoadReportingTest, Vanilla) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumRpcsPerAddress = 100; |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(), {}), 0); |
|
// Wait until all backends are ready. |
|
int num_ok = 0; |
|
int num_failure = 0; |
|
int num_drops = 0; |
|
std::tie(num_ok, num_failure, num_drops) = WaitForAllBackends(); |
|
// Send kNumRpcsPerAddress RPCs per server. |
|
CheckRpcSendOk(kNumRpcsPerAddress * num_backends_); |
|
// Each backend should have gotten 100 requests. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(kNumRpcsPerAddress, backends_[i]->service_.request_count()); |
|
} |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
|
|
ClientStats client_stats; |
|
do { |
|
client_stats += WaitForLoadReports(); |
|
} while (client_stats.num_calls_finished != |
|
kNumRpcsPerAddress * num_backends_ + num_ok); |
|
EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_ok, |
|
client_stats.num_calls_started); |
|
EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_ok, |
|
client_stats.num_calls_finished); |
|
EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
|
EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + (num_ok + num_drops), |
|
client_stats.num_calls_finished_known_received); |
|
EXPECT_THAT(client_stats.drop_token_counts, ::testing::ElementsAre()); |
|
} |
|
|
|
TEST_F(SingleBalancerWithClientLoadReportingTest, BalancerRestart) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumBackendsFirstPass = 2; |
|
const size_t kNumBackendsSecondPass = |
|
backends_.size() - kNumBackendsFirstPass; |
|
// Balancer returns backends starting at index 1. |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends(GetBackendPorts(0, kNumBackendsFirstPass), {}), |
|
0); |
|
// Wait until all backends returned by the balancer are ready. |
|
int num_ok = 0; |
|
int num_failure = 0; |
|
int num_drops = 0; |
|
std::tie(num_ok, num_failure, num_drops) = |
|
WaitForAllBackends(/* num_requests_multiple_of */ 1, /* start_index */ 0, |
|
/* stop_index */ kNumBackendsFirstPass); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
ClientStats client_stats = WaitForLoadReports(); |
|
EXPECT_EQ(static_cast<size_t>(num_ok), client_stats.num_calls_started); |
|
EXPECT_EQ(static_cast<size_t>(num_ok), client_stats.num_calls_finished); |
|
EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
|
EXPECT_EQ(static_cast<size_t>(num_ok), |
|
client_stats.num_calls_finished_known_received); |
|
EXPECT_THAT(client_stats.drop_token_counts, ::testing::ElementsAre()); |
|
// Shut down the balancer. |
|
balancers_[0]->Shutdown(); |
|
// Send 10 more requests per backend. This will continue using the |
|
// last serverlist we received from the balancer before it was shut down. |
|
ResetBackendCounters(); |
|
CheckRpcSendOk(kNumBackendsFirstPass); |
|
// Each backend should have gotten 1 request. |
|
for (size_t i = 0; i < kNumBackendsFirstPass; ++i) { |
|
EXPECT_EQ(1UL, backends_[i]->service_.request_count()); |
|
} |
|
// Now restart the balancer, this time pointing to all backends. |
|
balancers_[0]->Start(server_host_); |
|
ScheduleResponseForBalancer( |
|
0, BuildResponseForBackends(GetBackendPorts(kNumBackendsFirstPass), {}), |
|
0); |
|
// Wait for queries to start going to one of the new backends. |
|
// This tells us that we're now using the new serverlist. |
|
do { |
|
CheckRpcSendOk(); |
|
} while (backends_[2]->service_.request_count() == 0 && |
|
backends_[3]->service_.request_count() == 0); |
|
// Send one RPC per backend. |
|
CheckRpcSendOk(kNumBackendsSecondPass); |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// Check client stats. |
|
client_stats = WaitForLoadReports(); |
|
EXPECT_EQ(kNumBackendsSecondPass + 1, client_stats.num_calls_started); |
|
EXPECT_EQ(kNumBackendsSecondPass + 1, client_stats.num_calls_finished); |
|
EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
|
EXPECT_EQ(kNumBackendsSecondPass + 1, |
|
client_stats.num_calls_finished_known_received); |
|
EXPECT_THAT(client_stats.drop_token_counts, ::testing::ElementsAre()); |
|
} |
|
|
|
TEST_F(SingleBalancerWithClientLoadReportingTest, Drop) { |
|
SetNextResolutionAllBalancers(); |
|
const size_t kNumRpcsPerAddress = 3; |
|
const int num_of_drop_by_rate_limiting_addresses = 2; |
|
const int num_of_drop_by_load_balancing_addresses = 1; |
|
const int num_of_drop_addresses = num_of_drop_by_rate_limiting_addresses + |
|
num_of_drop_by_load_balancing_addresses; |
|
const int num_total_addresses = num_backends_ + num_of_drop_addresses; |
|
ScheduleResponseForBalancer( |
|
0, |
|
BuildResponseForBackends( |
|
GetBackendPorts(), |
|
{{"rate_limiting", num_of_drop_by_rate_limiting_addresses}, |
|
{"load_balancing", num_of_drop_by_load_balancing_addresses}}), |
|
0); |
|
// Wait until all backends are ready. |
|
int num_warmup_ok = 0; |
|
int num_warmup_failure = 0; |
|
int num_warmup_drops = 0; |
|
std::tie(num_warmup_ok, num_warmup_failure, num_warmup_drops) = |
|
WaitForAllBackends(num_total_addresses /* num_requests_multiple_of */); |
|
const int num_total_warmup_requests = |
|
num_warmup_ok + num_warmup_failure + num_warmup_drops; |
|
size_t num_drops = 0; |
|
for (size_t i = 0; i < kNumRpcsPerAddress * num_total_addresses; ++i) { |
|
EchoResponse response; |
|
const Status status = SendRpc(&response); |
|
if (!status.ok() && |
|
status.error_message() == "drop directed by grpclb balancer") { |
|
++num_drops; |
|
} else { |
|
EXPECT_TRUE(status.ok()) << "code=" << status.error_code() |
|
<< " message=" << status.error_message(); |
|
EXPECT_EQ(response.message(), kRequestMessage_); |
|
} |
|
} |
|
EXPECT_EQ(kNumRpcsPerAddress * num_of_drop_addresses, num_drops); |
|
// Each backend should have gotten 100 requests. |
|
for (size_t i = 0; i < backends_.size(); ++i) { |
|
EXPECT_EQ(kNumRpcsPerAddress, backends_[i]->service_.request_count()); |
|
} |
|
balancers_[0]->service_.NotifyDoneWithServerlists(); |
|
// The balancer got a single request. |
|
EXPECT_EQ(1U, balancers_[0]->service_.request_count()); |
|
// and sent a single response. |
|
EXPECT_EQ(1U, balancers_[0]->service_.response_count()); |
|
|
|
const ClientStats client_stats = WaitForLoadReports(); |
|
EXPECT_EQ( |
|
kNumRpcsPerAddress * num_total_addresses + num_total_warmup_requests, |
|
client_stats.num_calls_started); |
|
EXPECT_EQ( |
|
kNumRpcsPerAddress * num_total_addresses + num_total_warmup_requests, |
|
client_stats.num_calls_finished); |
|
EXPECT_EQ(0U, client_stats.num_calls_finished_with_client_failed_to_send); |
|
EXPECT_EQ(kNumRpcsPerAddress * num_backends_ + num_warmup_ok, |
|
client_stats.num_calls_finished_known_received); |
|
// The number of warmup request is a multiple of the number of addresses. |
|
// Therefore, all addresses in the scheduled balancer response are hit the |
|
// same number of times. |
|
const int num_times_drop_addresses_hit = |
|
num_warmup_drops / num_of_drop_addresses; |
|
EXPECT_THAT( |
|
client_stats.drop_token_counts, |
|
::testing::ElementsAre( |
|
::testing::Pair("load_balancing", |
|
(kNumRpcsPerAddress + num_times_drop_addresses_hit)), |
|
::testing::Pair( |
|
"rate_limiting", |
|
(kNumRpcsPerAddress + num_times_drop_addresses_hit) * 2))); |
|
} |
|
|
|
} // namespace |
|
} // namespace testing |
|
} // namespace grpc |
|
|
|
int main(int argc, char** argv) { |
|
grpc::testing::TestEnvironment env(&argc, argv); |
|
::testing::InitGoogleTest(&argc, argv); |
|
const auto result = RUN_ALL_TESTS(); |
|
return result; |
|
}
|
|
|