mirror of https://github.com/grpc/grpc.git
David Garcia Quintas
8 years ago
parent
4865c79548
commit
04911ca202
13 changed files with 965 additions and 6 deletions
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/*
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* |
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* Copyright 2017, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <arpa/inet.h> |
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#include <memory> |
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#include <mutex> |
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#include <sstream> |
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#include <thread> |
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#include <grpc++/channel.h> |
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#include <grpc++/client_context.h> |
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#include <grpc++/create_channel.h> |
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#include <grpc++/server.h> |
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#include <grpc++/server_builder.h> |
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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/string_util.h> |
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#include <grpc/support/thd.h> |
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#include <grpc/support/time.h> |
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#include <gtest/gtest.h> |
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extern "C" { |
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#include "test/core/end2end/fake_resolver.h" |
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} |
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#include "test/core/util/port.h" |
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#include "test/core/util/test_config.h" |
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#include "test/cpp/end2end/test_service_impl.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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// 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 pinging
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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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// - Test using DNS-resolvable names (localhost?)
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// - Test handling of creation of faulty RR instance by having the LB return a
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// serverlist with non-existent backends after having initially returned a
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// valid one.
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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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// - Restart of backend servers with no changes to serverlist. This exercises
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// the RR handover mechanism.
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using std::chrono::system_clock; |
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using grpc::lb::v1::LoadBalanceResponse; |
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using grpc::lb::v1::LoadBalanceRequest; |
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using grpc::lb::v1::LoadBalancer; |
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namespace grpc { |
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namespace testing { |
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namespace { |
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template <typename ServiceType> |
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class CountedService : public ServiceType { |
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public: |
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int request_count() { |
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std::unique_lock<std::mutex> lock(mu_); |
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return request_count_; |
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} |
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int response_count() { |
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std::unique_lock<std::mutex> lock(mu_); |
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return response_count_; |
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} |
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void IncreaseResponseCount() { |
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std::unique_lock<std::mutex> lock(mu_); |
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++response_count_; |
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} |
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void IncreaseRequestCount() { |
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std::unique_lock<std::mutex> lock(mu_); |
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++request_count_; |
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} |
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protected: |
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std::mutex mu_; |
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private: |
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int request_count_ = 0; |
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int response_count_ = 0; |
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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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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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IncreaseRequestCount(); |
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const auto status = TestServiceImpl::Echo(context, request, response); |
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IncreaseResponseCount(); |
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return status; |
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} |
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}; |
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grpc::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 grpc::string(reinterpret_cast<const char*>(&ip4), sizeof(ip4)); |
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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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BalancerServiceImpl() : shutdown_(false) {} |
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Status BalanceLoad(ServerContext* context, Stream* stream) override { |
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LoadBalanceRequest request; |
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stream->Read(&request); |
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IncreaseRequestCount(); |
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gpr_log(GPR_INFO, "LB: recv msg '%s'", request.DebugString().c_str()); |
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std::vector<ResponseDelayPair> responses_and_delays; |
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{ |
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std::unique_lock<std::mutex> 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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if (shutdown_) break; |
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SendResponse(stream, response_and_delay.first, response_and_delay.second); |
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} |
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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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std::unique_lock<std::mutex> 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 Shutdown() { |
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std::unique_lock<std::mutex> lock(mu_); |
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shutdown_ = true; |
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} |
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static LoadBalanceResponse BuildResponseForBackends( |
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const std::vector<int>& backend_ports) { |
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LoadBalanceResponse response; |
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for (const int backend_port : backend_ports) { |
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auto* server = response.mutable_server_list()->add_servers(); |
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server->set_ip_address(Ip4ToPackedString("127.0.0.1")); |
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server->set_port(backend_port); |
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} |
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return response; |
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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: sleeping for %d ms...", delay_ms); |
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gpr_sleep_until(gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
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gpr_time_from_millis(delay_ms, GPR_TIMESPAN))); |
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gpr_log(GPR_INFO, "LB: Woke up! Sending response '%s'", |
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response.DebugString().c_str()); |
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stream->Write(response); |
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IncreaseResponseCount(); |
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} |
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std::vector<ResponseDelayPair> responses_and_delays_; |
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bool shutdown_; |
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}; |
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class GrpclbEnd2endTest : public ::testing::Test { |
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protected: |
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GrpclbEnd2endTest(int num_backends, int num_balancers) |
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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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void SetUp() override { |
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response_generator_ = grpc_fake_resolver_response_generator_create(); |
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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 BackendServiceImpl()); |
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backend_servers_.emplace_back(ServerThread<BackendService>( |
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"backend", server_host_, backends_.back().get())); |
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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 BalancerServiceImpl()); |
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balancer_servers_.emplace_back(ServerThread<BalancerService>( |
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"balancer", server_host_, balancers_.back().get())); |
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} |
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ResetStub(); |
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std::vector<AddressData> addresses; |
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for (size_t i = 0; i < balancer_servers_.size(); ++i) { |
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addresses.emplace_back(AddressData{balancer_servers_[i].port_, true, ""}); |
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} |
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SetNextResolution(addresses); |
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} |
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void TearDown() override { |
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for (size_t i = 0; i < backends_.size(); ++i) { |
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backend_servers_[i].Shutdown(); |
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} |
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for (size_t i = 0; i < balancers_.size(); ++i) { |
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balancers_[i]->Shutdown(); |
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balancer_servers_[i].Shutdown(); |
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} |
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grpc_fake_resolver_response_generator_unref(response_generator_); |
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} |
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void ResetStub() { |
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ChannelArguments args; |
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args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR, |
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response_generator_); |
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std::ostringstream uri; |
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uri << "test:///servername_not_used"; |
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channel_ = |
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CreateCustomChannel(uri.str(), InsecureChannelCredentials(), args); |
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stub_ = grpc::testing::EchoTestService::NewStub(channel_); |
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} |
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struct AddressData { |
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int port; |
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bool is_balancer; |
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grpc::string balancer_name; |
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}; |
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void SetNextResolution(const std::vector<AddressData>& address_data) { |
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grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
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grpc_lb_addresses* addresses = |
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grpc_lb_addresses_create(address_data.size(), nullptr); |
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for (size_t i = 0; i < address_data.size(); ++i) { |
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char* lb_uri_str; |
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gpr_asprintf(&lb_uri_str, "ipv4:127.0.0.1:%d", address_data[i].port); |
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grpc_uri* lb_uri = grpc_uri_parse(&exec_ctx, lb_uri_str, true); |
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GPR_ASSERT(lb_uri != nullptr); |
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grpc_lb_addresses_set_address_from_uri( |
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addresses, i, lb_uri, address_data[i].is_balancer, |
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address_data[i].balancer_name.c_str(), nullptr); |
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grpc_uri_destroy(lb_uri); |
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gpr_free(lb_uri_str); |
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} |
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grpc_arg fake_addresses = grpc_lb_addresses_create_channel_arg(addresses); |
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grpc_channel_args fake_result = {1, &fake_addresses}; |
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grpc_fake_resolver_response_generator_set_response( |
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&exec_ctx, response_generator_, &fake_result); |
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grpc_lb_addresses_destroy(&exec_ctx, addresses); |
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grpc_exec_ctx_finish(&exec_ctx); |
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} |
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const std::vector<int> GetBackendPorts() const { |
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std::vector<int> backend_ports; |
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for (const auto& bs : backend_servers_) { |
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backend_ports.push_back(bs.port_); |
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} |
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return backend_ports; |
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} |
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void ScheduleResponseForBalancer(size_t i, |
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const LoadBalanceResponse& response, |
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int delay_ms) { |
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balancers_.at(i)->add_response(response, delay_ms); |
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} |
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std::vector<std::pair<Status, EchoResponse>> SendRpc(const string& message, |
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int num_rpcs, |
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int deadline_ms = 1000) { |
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std::vector<std::pair<Status, EchoResponse>> results; |
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EchoRequest request; |
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EchoResponse response; |
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const auto deadline = std::chrono::system_clock::now() + |
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std::chrono::milliseconds(deadline_ms); |
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request.set_message(message); |
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for (int i = 0; i < num_rpcs; i++) { |
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ClientContext context; |
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context.set_deadline(deadline); |
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Status status = stub_->Echo(&context, request, &response); |
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results.push_back(std::make_pair(status, response)); |
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} |
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return results; |
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} |
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template <typename T> |
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struct ServerThread { |
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explicit ServerThread(const grpc::string& type, |
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const grpc::string& server_host, T* service) |
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: type_(type), service_(service) { |
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port_ = grpc_pick_unused_port_or_die(); |
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gpr_log(GPR_INFO, "starting %s server on port %d", type_.c_str(), port_); |
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std::mutex mu; |
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std::condition_variable cond; |
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thread_.reset(new std::thread( |
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std::bind(&ServerThread::Start, this, server_host, &mu, &cond))); |
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std::unique_lock<std::mutex> lock(mu); |
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cond.wait(lock); |
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gpr_log(GPR_INFO, "%s server startup complete", type_.c_str()); |
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} |
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void Start(const grpc::string& server_host, std::mutex* mu, |
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std::condition_variable* cond) { |
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std::ostringstream server_address; |
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server_address << server_host << ":" << port_; |
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ServerBuilder builder; |
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builder.AddListeningPort(server_address.str(), |
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InsecureServerCredentials()); |
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builder.RegisterService(service_); |
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server_ = builder.BuildAndStart(); |
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std::lock_guard<std::mutex> lock(*mu); |
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cond->notify_one(); |
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} |
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void Shutdown() { |
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gpr_log(GPR_INFO, "%s about to shutdown", type_.c_str()); |
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server_->Shutdown(); |
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thread_->join(); |
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gpr_log(GPR_INFO, "%s shutdown completed", type_.c_str()); |
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} |
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int port_; |
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grpc::string type_; |
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std::unique_ptr<Server> server_; |
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T* service_; |
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std::unique_ptr<std::thread> thread_; |
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}; |
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const grpc::string kMessage_ = "Live long and prosper."; |
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const grpc::string server_host_; |
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const size_t num_backends_; |
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const size_t num_balancers_; |
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CompletionQueue cli_cq_; |
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std::shared_ptr<Channel> channel_; |
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std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_; |
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std::vector<std::unique_ptr<BackendServiceImpl>> backends_; |
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std::vector<std::unique_ptr<BalancerServiceImpl>> balancers_; |
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std::vector<ServerThread<BackendService>> backend_servers_; |
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std::vector<ServerThread<BalancerService>> balancer_servers_; |
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grpc_fake_resolver_response_generator* response_generator_; |
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}; |
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class SingleBalancerTest : public GrpclbEnd2endTest { |
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public: |
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SingleBalancerTest() : GrpclbEnd2endTest(4, 1) {} |
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}; |
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TEST_F(SingleBalancerTest, Vanilla) { |
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ScheduleResponseForBalancer( |
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0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts()), 0); |
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// Start servers and send 100 RPCs per server.
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const auto& statuses_and_responses = SendRpc(kMessage_, 100 * num_backends_); |
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for (const auto& status_and_response : statuses_and_responses) { |
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EXPECT_TRUE(status_and_response.first.ok()); |
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EXPECT_EQ(status_and_response.second.message(), kMessage_); |
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} |
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// Each backend should have gotten 100 requests.
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for (size_t i = 0; i < backends_.size(); ++i) { |
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EXPECT_EQ(100, backend_servers_[i].service_->request_count()); |
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} |
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// The balancer got a single request.
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EXPECT_EQ(1, balancer_servers_[0].service_->request_count()); |
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// and sent a single response.
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EXPECT_EQ(1, balancer_servers_[0].service_->response_count()); |
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// Check LB policy name for the channel.
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EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
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} |
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TEST_F(SingleBalancerTest, InitiallyEmptyServerlist) { |
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constexpr int kServerlistDelayMs = 500; |
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constexpr int kCallDeadlineMs = 1000; |
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// First response is an empty serverlist, sent right away.
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ScheduleResponseForBalancer(0, LoadBalanceResponse(), 0); |
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// Send non-empty serverlist only after kServerlistDelayMs
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ScheduleResponseForBalancer( |
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0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts()), |
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kServerlistDelayMs); |
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const auto t0 = system_clock::now(); |
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// Client will block: LB will initially send empty serverlist.
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const auto& statuses_and_responses = |
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SendRpc(kMessage_, num_backends_, kCallDeadlineMs); |
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const auto ellapsed_ms = |
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std::chrono::duration_cast<std::chrono::milliseconds>( |
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system_clock::now() - t0); |
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// but eventually, the LB sends a serverlist update that allows the call to
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// proceed. The call delay must be larger than the delay in sending the
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// populated serverlist but under the call's deadline.
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EXPECT_GT(ellapsed_ms.count(), kServerlistDelayMs); |
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EXPECT_LT(ellapsed_ms.count(), kCallDeadlineMs); |
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// Each backend should have gotten 1 request.
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for (size_t i = 0; i < backends_.size(); ++i) { |
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EXPECT_EQ(1, backend_servers_[i].service_->request_count()); |
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} |
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for (const auto& status_and_response : statuses_and_responses) { |
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EXPECT_TRUE(status_and_response.first.ok()); |
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EXPECT_EQ(status_and_response.second.message(), kMessage_); |
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} |
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// The balancer got a single request.
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EXPECT_EQ(1, balancer_servers_[0].service_->request_count()); |
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// and sent two responses.
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EXPECT_EQ(2, balancer_servers_[0].service_->response_count()); |
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// Check LB policy name for the channel.
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EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
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} |
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TEST_F(SingleBalancerTest, RepeatedServerlist) { |
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constexpr int kServerlistDelayMs = 100; |
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// Send a serverlist right away.
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ScheduleResponseForBalancer( |
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0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts()), 0); |
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// ... and the same one a bit later.
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ScheduleResponseForBalancer( |
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0, BalancerServiceImpl::BuildResponseForBackends(GetBackendPorts()), |
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kServerlistDelayMs); |
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// Send num_backends/2 requests.
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auto statuses_and_responses = SendRpc(kMessage_, num_backends_ / 2); |
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// only the first half of the backends will receive them.
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for (size_t i = 0; i < backends_.size(); ++i) { |
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if (i < backends_.size() / 2) |
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EXPECT_EQ(1, backend_servers_[i].service_->request_count()); |
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else |
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EXPECT_EQ(0, backend_servers_[i].service_->request_count()); |
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} |
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EXPECT_EQ(statuses_and_responses.size(), num_backends_ / 2); |
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for (const auto& status_and_response : statuses_and_responses) { |
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EXPECT_TRUE(status_and_response.first.ok()); |
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EXPECT_EQ(status_and_response.second.message(), kMessage_); |
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} |
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// Wait for the (duplicated) serverlist update.
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gpr_sleep_until(gpr_time_add( |
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gpr_now(GPR_CLOCK_REALTIME), |
||||
gpr_time_from_millis(kServerlistDelayMs * 1.1, GPR_TIMESPAN))); |
||||
|
||||
// Verify the LB has sent two responses.
|
||||
EXPECT_EQ(2, balancer_servers_[0].service_->response_count()); |
||||
|
||||
// Some more calls to complete the total number of backends.
|
||||
statuses_and_responses = SendRpc( |
||||
kMessage_, |
||||
num_backends_ / 2 + (num_backends_ & 0x1) /* extra one if num_bes odd */); |
||||
// Because a duplicated serverlist should have no effect, all backends must
|
||||
// have been hit once now.
|
||||
for (size_t i = 0; i < backends_.size(); ++i) { |
||||
EXPECT_EQ(1, backend_servers_[i].service_->request_count()); |
||||
} |
||||
EXPECT_EQ(statuses_and_responses.size(), num_backends_ / 2); |
||||
for (const auto& status_and_response : statuses_and_responses) { |
||||
EXPECT_TRUE(status_and_response.first.ok()); |
||||
EXPECT_EQ(status_and_response.second.message(), kMessage_); |
||||
} |
||||
|
||||
// The balancer got a single request.
|
||||
EXPECT_EQ(1, balancer_servers_[0].service_->request_count()); |
||||
// Check LB policy name for the channel.
|
||||
EXPECT_EQ("grpclb", channel_->GetLoadBalancingPolicyName()); |
||||
} |
||||
|
||||
} // namespace
|
||||
} // namespace testing
|
||||
} // namespace grpc
|
||||
|
||||
int main(int argc, char** argv) { |
||||
grpc_init(); |
||||
grpc_test_init(argc, argv); |
||||
grpc_fake_resolver_init(); |
||||
::testing::InitGoogleTest(&argc, argv); |
||||
const auto result = RUN_ALL_TESTS(); |
||||
grpc_shutdown(); |
||||
return result; |
||||
} |
||||
@ -0,0 +1,215 @@ |
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<PlatformToolset>v140</PlatformToolset> |
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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@ -0,0 +1,39 @@ |
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||||
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||||
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||||
|
||||
Loading…
Reference in new issue