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@@ -0,0 +1,1214 @@
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+/*
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+ *
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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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+ */
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+
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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 <thread>
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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/string_util.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/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/parse_address.h"
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+#include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h"
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+#include "src/core/ext/filters/client_channel/server_address.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/security/credentials/fake/fake_credentials.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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+
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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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+
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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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+
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+#include <gmock/gmock.h>
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+#include <gtest/gtest.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 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 xds 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 xds 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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+
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+using std::chrono::system_clock;
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+
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+using grpc::lb::v1::LoadBalanceRequest;
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+using grpc::lb::v1::LoadBalanceResponse;
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+using grpc::lb::v1::LoadBalancer;
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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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+template <typename ServiceType>
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+class CountedService : public ServiceType {
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+ public:
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+ size_t 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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+
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+ size_t 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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+
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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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+
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+ void ResetCounters() {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ request_count_ = 0;
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+ response_count_ = 0;
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+ }
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+
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+ protected:
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+ std::mutex mu_;
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+
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+ private:
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+ size_t request_count_ = 0;
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+ size_t response_count_ = 0;
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+};
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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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+class BackendServiceImpl : public BackendService {
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+ public:
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+ BackendServiceImpl() {}
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+
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+ Status Echo(ServerContext* context, const EchoRequest* request,
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+ EchoResponse* response) override {
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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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+
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+ // Returns true on its first invocation, false otherwise.
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+ bool Shutdown() {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ const bool prev = !shutdown_;
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+ shutdown_ = true;
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+ gpr_log(GPR_INFO, "Backend: shut down");
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+ return prev;
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+ }
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+
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+ std::set<grpc::string> clients() {
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+ std::unique_lock<std::mutex> lock(clients_mu_);
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+ return clients_;
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+ }
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+
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+ private:
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+ void AddClient(const grpc::string& client) {
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+ std::unique_lock<std::mutex> lock(clients_mu_);
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+ clients_.insert(client);
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+ }
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+
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+ std::mutex mu_;
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+ bool shutdown_ = false;
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+ std::mutex clients_mu_;
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+ std::set<grpc::string> clients_;
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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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+
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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<grpc::string, size_t> drop_token_counts;
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+
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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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+};
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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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+
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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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+ shutdown_(false) {}
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+
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+ Status BalanceLoad(ServerContext* context, Stream* stream) override {
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+ // TODO(juanlishen): Clean up the scoping.
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+ gpr_log(GPR_INFO, "LB[%p]: BalanceLoad", this);
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+ {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ if (shutdown_) goto done;
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+ }
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+
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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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+
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+ if (!stream->Read(&request)) {
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+ goto done;
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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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+
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+ {
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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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+ {
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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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+ {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ if (shutdown_) goto done;
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+ }
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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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+ std::unique_lock<std::mutex> lock(mu_);
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+ if (shutdown_) goto done;
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+ serverlist_cond_.wait(lock, [this] { return serverlist_ready_; });
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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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+ if (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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+ // 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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+ std::lock_guard<std::mutex> lock(mu_);
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+ client_stats_.num_calls_started +=
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+ request.client_stats().num_calls_started();
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+ client_stats_.num_calls_finished +=
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+ request.client_stats().num_calls_finished();
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+ client_stats_.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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+ client_stats_.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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+ client_stats_
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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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+ load_report_ready_ = true;
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+ load_report_cond_.notify_one();
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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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+
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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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+
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+ // Returns true on its first invocation, false otherwise.
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+ bool Shutdown() {
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+ bool prev;
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+ {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ prev = !shutdown_;
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+ shutdown_ = true;
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+ }
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+ NotifyDoneWithServerlists();
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+ gpr_log(GPR_INFO, "LB[%p]: shut down", this);
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+ return prev;
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+ }
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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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+ const std::map<grpc::string, size_t>& drop_token_counts) {
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+ LoadBalanceResponse response;
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+ for (const auto& drop_token_count : drop_token_counts) {
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+ for (size_t i = 0; i < drop_token_count.second; ++i) {
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+ auto* server = response.mutable_server_list()->add_servers();
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+ server->set_drop(true);
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+ server->set_load_balance_token(drop_token_count.first);
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+ }
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+ }
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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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+ static int token_count = 0;
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+ char* token;
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+ gpr_asprintf(&token, "token%03d", ++token_count);
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+ server->set_load_balance_token(token);
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+ gpr_free(token);
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+ }
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+ return response;
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+ }
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+
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+ const ClientStats& WaitForLoadReport() {
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+ std::unique_lock<std::mutex> lock(mu_);
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+ load_report_cond_.wait(lock, [this] { return load_report_ready_; });
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+ load_report_ready_ = false;
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+ return client_stats_;
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+ }
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+
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+ void NotifyDoneWithServerlists() {
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+ std::lock_guard<std::mutex> lock(mu_);
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+ serverlist_ready_ = true;
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+ serverlist_cond_.notify_all();
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+ }
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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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+
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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::mutex mu_;
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+ std::condition_variable load_report_cond_;
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+ bool load_report_ready_ = false;
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+ std::condition_variable serverlist_cond_;
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+ bool serverlist_ready_ = false;
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+ ClientStats client_stats_;
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+ bool shutdown_;
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+};
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+
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+class XdsEnd2endTest : public ::testing::Test {
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+ protected:
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+ XdsEnd2endTest(int num_backends, int 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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+ // 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_setenv("GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS", "1");
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+ }
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+
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|
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+ void SetUp() override {
|
|
|
+ response_generator_ =
|
|
|
+ grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
|
|
|
+ lb_channel_response_generator_ =
|
|
|
+ grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
|
|
|
+ // Start the backends.
|
|
|
+ for (size_t i = 0; i < num_backends_; ++i) {
|
|
|
+ backends_.emplace_back(new BackendServiceImpl());
|
|
|
+ backend_servers_.emplace_back(ServerThread<BackendService>(
|
|
|
+ "backend", server_host_, backends_.back().get()));
|
|
|
+ }
|
|
|
+ // Start the load balancers.
|
|
|
+ for (size_t i = 0; i < num_balancers_; ++i) {
|
|
|
+ balancers_.emplace_back(
|
|
|
+ new BalancerServiceImpl(client_load_reporting_interval_seconds_));
|
|
|
+ balancer_servers_.emplace_back(ServerThread<BalancerService>(
|
|
|
+ "balancer", server_host_, balancers_.back().get()));
|
|
|
+ }
|
|
|
+ ResetStub();
|
|
|
+ }
|
|
|
+
|
|
|
+ void TearDown() override {
|
|
|
+ for (size_t i = 0; i < backends_.size(); ++i) {
|
|
|
+ if (backends_[i]->Shutdown()) backend_servers_[i].Shutdown();
|
|
|
+ }
|
|
|
+ for (size_t i = 0; i < balancers_.size(); ++i) {
|
|
|
+ if (balancers_[i]->Shutdown()) balancer_servers_[i].Shutdown();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ void ResetStub(int fallback_timeout = 0,
|
|
|
+ const grpc::string& expected_targets = "") {
|
|
|
+ ChannelArguments args;
|
|
|
+ // TODO(juanlishen): Add setter to ChannelArguments.
|
|
|
+ args.SetInt(GRPC_ARG_XDS_FALLBACK_TIMEOUT_MS, fallback_timeout);
|
|
|
+ args.SetPointer(GRPC_ARG_FAKE_RESOLVER_RESPONSE_GENERATOR,
|
|
|
+ response_generator_.get());
|
|
|
+ if (!expected_targets.empty()) {
|
|
|
+ args.SetString(GRPC_ARG_FAKE_SECURITY_EXPECTED_TARGETS, expected_targets);
|
|
|
+ }
|
|
|
+ std::ostringstream uri;
|
|
|
+ uri << "fake:///" << kApplicationTargetName_;
|
|
|
+ // TODO(dgq): templatize tests to run everything using both secure and
|
|
|
+ // insecure channel credentials.
|
|
|
+ grpc_channel_credentials* channel_creds =
|
|
|
+ grpc_fake_transport_security_credentials_create();
|
|
|
+ grpc_call_credentials* call_creds = grpc_md_only_test_credentials_create(
|
|
|
+ g_kCallCredsMdKey, g_kCallCredsMdValue, false);
|
|
|
+ std::shared_ptr<ChannelCredentials> creds(
|
|
|
+ new SecureChannelCredentials(grpc_composite_channel_credentials_create(
|
|
|
+ channel_creds, call_creds, nullptr)));
|
|
|
+ call_creds->Unref();
|
|
|
+ channel_creds->Unref();
|
|
|
+ channel_ = CreateCustomChannel(uri.str(), creds, args);
|
|
|
+ stub_ = grpc::testing::EchoTestService::NewStub(channel_);
|
|
|
+ }
|
|
|
+
|
|
|
+ void ResetBackendCounters() {
|
|
|
+ for (const auto& backend : backends_) backend->ResetCounters();
|
|
|
+ }
|
|
|
+
|
|
|
+ ClientStats WaitForLoadReports() {
|
|
|
+ ClientStats client_stats;
|
|
|
+ for (const auto& balancer : balancers_) {
|
|
|
+ client_stats += balancer->WaitForLoadReport();
|
|
|
+ }
|
|
|
+ return client_stats;
|
|
|
+ }
|
|
|
+
|
|
|
+ bool SeenAllBackends() {
|
|
|
+ for (const auto& backend : backends_) {
|
|
|
+ if (backend->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() == "Call dropped by load balancing policy") {
|
|
|
+ ++*num_drops;
|
|
|
+ } else {
|
|
|
+ ++*num_failure;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ ++*num_total;
|
|
|
+ }
|
|
|
+
|
|
|
+ std::tuple<int, int, int> WaitForAllBackends(
|
|
|
+ int num_requests_multiple_of = 1) {
|
|
|
+ int num_ok = 0;
|
|
|
+ int num_failure = 0;
|
|
|
+ int num_drops = 0;
|
|
|
+ int num_total = 0;
|
|
|
+ while (!SeenAllBackends()) {
|
|
|
+ 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]->request_count() == 0);
|
|
|
+ ResetBackendCounters();
|
|
|
+ }
|
|
|
+
|
|
|
+ grpc_core::ServerAddressList CreateLbAddressesFromPortList(
|
|
|
+ const std::vector<int>& ports) {
|
|
|
+ grpc_core::ServerAddressList addresses;
|
|
|
+ for (int port : ports) {
|
|
|
+ char* lb_uri_str;
|
|
|
+ gpr_asprintf(&lb_uri_str, "ipv4:127.0.0.1:%d", port);
|
|
|
+ grpc_uri* lb_uri = grpc_uri_parse(lb_uri_str, true);
|
|
|
+ GPR_ASSERT(lb_uri != nullptr);
|
|
|
+ grpc_resolved_address address;
|
|
|
+ GPR_ASSERT(grpc_parse_uri(lb_uri, &address));
|
|
|
+ std::vector<grpc_arg> args_to_add;
|
|
|
+ grpc_channel_args* args = grpc_channel_args_copy_and_add(
|
|
|
+ nullptr, args_to_add.data(), args_to_add.size());
|
|
|
+ addresses.emplace_back(address.addr, address.len, args);
|
|
|
+ grpc_uri_destroy(lb_uri);
|
|
|
+ gpr_free(lb_uri_str);
|
|
|
+ }
|
|
|
+ return addresses;
|
|
|
+ }
|
|
|
+
|
|
|
+ void SetNextResolution(const std::vector<int>& ports,
|
|
|
+ const char* service_config_json = nullptr,
|
|
|
+ grpc_core::FakeResolverResponseGenerator*
|
|
|
+ lb_channel_response_generator = nullptr) {
|
|
|
+ grpc_core::ExecCtx exec_ctx;
|
|
|
+ grpc_core::ServerAddressList addresses =
|
|
|
+ CreateLbAddressesFromPortList(ports);
|
|
|
+ std::vector<grpc_arg> args = {
|
|
|
+ CreateServerAddressListChannelArg(&addresses),
|
|
|
+ grpc_core::FakeResolverResponseGenerator::MakeChannelArg(
|
|
|
+ lb_channel_response_generator == nullptr
|
|
|
+ ? lb_channel_response_generator_.get()
|
|
|
+ : lb_channel_response_generator)};
|
|
|
+ if (service_config_json != nullptr) {
|
|
|
+ args.push_back(grpc_channel_arg_string_create(
|
|
|
+ const_cast<char*>(GRPC_ARG_SERVICE_CONFIG),
|
|
|
+ const_cast<char*>(service_config_json)));
|
|
|
+ }
|
|
|
+ grpc_channel_args fake_result = {args.size(), args.data()};
|
|
|
+ response_generator_->SetResponse(&fake_result);
|
|
|
+ }
|
|
|
+
|
|
|
+ void SetNextResolutionForLbChannelAllBalancers(
|
|
|
+ const char* service_config_json = nullptr,
|
|
|
+ grpc_core::FakeResolverResponseGenerator* lb_channel_response_generator =
|
|
|
+ nullptr) {
|
|
|
+ std::vector<int> ports;
|
|
|
+ for (size_t i = 0; i < balancer_servers_.size(); ++i) {
|
|
|
+ ports.emplace_back(balancer_servers_[i].port_);
|
|
|
+ }
|
|
|
+ SetNextResolutionForLbChannel(ports, service_config_json,
|
|
|
+ lb_channel_response_generator);
|
|
|
+ }
|
|
|
+
|
|
|
+ void SetNextResolutionForLbChannel(
|
|
|
+ const std::vector<int>& ports, const char* service_config_json = nullptr,
|
|
|
+ grpc_core::FakeResolverResponseGenerator* lb_channel_response_generator =
|
|
|
+ nullptr) {
|
|
|
+ grpc_core::ExecCtx exec_ctx;
|
|
|
+ grpc_core::ServerAddressList addresses =
|
|
|
+ CreateLbAddressesFromPortList(ports);
|
|
|
+ std::vector<grpc_arg> args = {
|
|
|
+ CreateServerAddressListChannelArg(&addresses),
|
|
|
+ };
|
|
|
+ if (service_config_json != nullptr) {
|
|
|
+ args.push_back(grpc_channel_arg_string_create(
|
|
|
+ const_cast<char*>(GRPC_ARG_SERVICE_CONFIG),
|
|
|
+ const_cast<char*>(service_config_json)));
|
|
|
+ }
|
|
|
+ grpc_channel_args fake_result = {args.size(), args.data()};
|
|
|
+ if (lb_channel_response_generator == nullptr) {
|
|
|
+ lb_channel_response_generator = lb_channel_response_generator_.get();
|
|
|
+ }
|
|
|
+ lb_channel_response_generator->SetResponse(&fake_result);
|
|
|
+ }
|
|
|
+
|
|
|
+ void SetNextReresolutionResponse(const std::vector<int>& ports) {
|
|
|
+ grpc_core::ExecCtx exec_ctx;
|
|
|
+ grpc_core::ServerAddressList addresses =
|
|
|
+ CreateLbAddressesFromPortList(ports);
|
|
|
+ grpc_arg fake_addresses = CreateServerAddressListChannelArg(&addresses);
|
|
|
+ grpc_channel_args fake_result = {1, &fake_addresses};
|
|
|
+ response_generator_->SetReresolutionResponse(&fake_result);
|
|
|
+ }
|
|
|
+
|
|
|
+ const std::vector<int> GetBackendPorts(const size_t start_index = 0) const {
|
|
|
+ std::vector<int> backend_ports;
|
|
|
+ for (size_t i = start_index; i < backend_servers_.size(); ++i) {
|
|
|
+ backend_ports.push_back(backend_servers_[i].port_);
|
|
|
+ }
|
|
|
+ return backend_ports;
|
|
|
+ }
|
|
|
+
|
|
|
+ void ScheduleResponseForBalancer(size_t i,
|
|
|
+ const LoadBalanceResponse& response,
|
|
|
+ int delay_ms) {
|
|
|
+ balancers_.at(i)->add_response(response, delay_ms);
|
|
|
+ }
|
|
|
+
|
|
|
+ Status SendRpc(EchoResponse* response = nullptr, int timeout_ms = 1000,
|
|
|
+ bool wait_for_ready = false) {
|
|
|
+ const bool local_response = (response == nullptr);
|
|
|
+ if (local_response) response = new EchoResponse;
|
|
|
+ EchoRequest request;
|
|
|
+ request.set_message(kRequestMessage_);
|
|
|
+ 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 {
|
|
|
+ explicit ServerThread(const grpc::string& type,
|
|
|
+ const grpc::string& server_host, T* service)
|
|
|
+ : type_(type), service_(service) {
|
|
|
+ std::mutex mu;
|
|
|
+ // We need to acquire the lock here in order to prevent the notify_one
|
|
|
+ // by ServerThread::Start from firing before the wait below is hit.
|
|
|
+ std::unique_lock<std::mutex> lock(mu);
|
|
|
+ port_ = grpc_pick_unused_port_or_die();
|
|
|
+ gpr_log(GPR_INFO, "starting %s server on port %d", type_.c_str(), port_);
|
|
|
+ std::condition_variable cond;
|
|
|
+ thread_.reset(new std::thread(
|
|
|
+ std::bind(&ServerThread::Start, this, server_host, &mu, &cond)));
|
|
|
+ cond.wait(lock);
|
|
|
+ gpr_log(GPR_INFO, "%s server startup complete", type_.c_str());
|
|
|
+ }
|
|
|
+
|
|
|
+ void Start(const grpc::string& server_host, std::mutex* mu,
|
|
|
+ std::condition_variable* cond) {
|
|
|
+ // We need to acquire the lock here in order to prevent the notify_one
|
|
|
+ // below from firing before its corresponding wait is executed.
|
|
|
+ std::lock_guard<std::mutex> 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->notify_one();
|
|
|
+ }
|
|
|
+
|
|
|
+ void Shutdown() {
|
|
|
+ gpr_log(GPR_INFO, "%s about to shutdown", type_.c_str());
|
|
|
+ server_->Shutdown(grpc_timeout_milliseconds_to_deadline(0));
|
|
|
+ thread_->join();
|
|
|
+ gpr_log(GPR_INFO, "%s shutdown completed", type_.c_str());
|
|
|
+ }
|
|
|
+
|
|
|
+ int port_;
|
|
|
+ grpc::string type_;
|
|
|
+ std::unique_ptr<Server> server_;
|
|
|
+ T* service_;
|
|
|
+ std::unique_ptr<std::thread> thread_;
|
|
|
+ };
|
|
|
+
|
|
|
+ const grpc::string server_host_;
|
|
|
+ const size_t num_backends_;
|
|
|
+ const size_t num_balancers_;
|
|
|
+ const int client_load_reporting_interval_seconds_;
|
|
|
+ std::shared_ptr<Channel> channel_;
|
|
|
+ std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
|
|
|
+ std::vector<std::unique_ptr<BackendServiceImpl>> backends_;
|
|
|
+ std::vector<std::unique_ptr<BalancerServiceImpl>> balancers_;
|
|
|
+ std::vector<ServerThread<BackendService>> backend_servers_;
|
|
|
+ std::vector<ServerThread<BalancerService>> balancer_servers_;
|
|
|
+ grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator>
|
|
|
+ response_generator_;
|
|
|
+ grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator>
|
|
|
+ lb_channel_response_generator_;
|
|
|
+ const grpc::string kRequestMessage_ = "Live long and prosper.";
|
|
|
+ const grpc::string kApplicationTargetName_ = "application_target_name";
|
|
|
+ const grpc::string kDefaultServiceConfig_ =
|
|
|
+ "{\n"
|
|
|
+ " \"loadBalancingConfig\":[\n"
|
|
|
+ " { \"does_not_exist\":{} },\n"
|
|
|
+ " { \"xds_experimental\":{ \"balancerName\": \"fake:///lb\" } }\n"
|
|
|
+ " ]\n"
|
|
|
+ "}";
|
|
|
+};
|
|
|
+
|
|
|
+class SingleBalancerTest : public XdsEnd2endTest {
|
|
|
+ public:
|
|
|
+ SingleBalancerTest() : XdsEnd2endTest(4, 1, 0) {}
|
|
|
+};
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, Vanilla) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const size_t kNumRpcsPerAddress = 100;
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::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,
|
|
|
+ backend_servers_[i].service_->request_count());
|
|
|
+ }
|
|
|
+ balancers_[0]->NotifyDoneWithServerlists();
|
|
|
+ // The balancer got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+
|
|
|
+ // Check LB policy name for the channel.
|
|
|
+ EXPECT_EQ("xds_experimental", channel_->GetLoadBalancingPolicyName());
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, SameBackendListedMultipleTimes) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ // Same backend listed twice.
|
|
|
+ std::vector<int> ports;
|
|
|
+ ports.push_back(backend_servers_[0].port_);
|
|
|
+ ports.push_back(backend_servers_[0].port_);
|
|
|
+ const size_t kNumRpcsPerAddress = 10;
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::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,
|
|
|
+ backend_servers_[0].service_->request_count());
|
|
|
+ // And they should have come from a single client port, because of
|
|
|
+ // subchannel sharing.
|
|
|
+ EXPECT_EQ(1UL, backends_[0]->clients().size());
|
|
|
+ balancers_[0]->NotifyDoneWithServerlists();
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, SecureNaming) {
|
|
|
+ // TODO(juanlishen): Use separate fake creds for the balancer channel.
|
|
|
+ ResetStub(0, kApplicationTargetName_ + ";lb");
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannel({balancer_servers_[0].port_});
|
|
|
+ const size_t kNumRpcsPerAddress = 100;
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::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,
|
|
|
+ backend_servers_[i].service_->request_count());
|
|
|
+ }
|
|
|
+ // The balancer got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, SecureNamingDeathTest) {
|
|
|
+ ::testing::FLAGS_gtest_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(
|
|
|
+ {
|
|
|
+ ResetStub(0, kApplicationTargetName_ + ";lb");
|
|
|
+ SetNextResolution({},
|
|
|
+ "{\n"
|
|
|
+ " \"loadBalancingConfig\":[\n"
|
|
|
+ " { \"does_not_exist\":{} },\n"
|
|
|
+ " { \"xds_experimental\":{ \"balancerName\": "
|
|
|
+ "\"fake:///wrong_lb\" } }\n"
|
|
|
+ " ]\n"
|
|
|
+ "}");
|
|
|
+ SetNextResolutionForLbChannel({balancer_servers_[0].port_});
|
|
|
+ channel_->WaitForConnected(grpc_timeout_seconds_to_deadline(1));
|
|
|
+ },
|
|
|
+ "");
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, InitiallyEmptyServerlist) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const int kServerlistDelayMs = 500 * grpc_test_slowdown_factor();
|
|
|
+ const int kCallDeadlineMs = kServerlistDelayMs * 2;
|
|
|
+ // First response is an empty serverlist, sent right away.
|
|
|
+ ScheduleResponseForBalancer(0, LoadBalanceResponse(), 0);
|
|
|
+ // Send non-empty serverlist only after kServerlistDelayMs
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::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]->NotifyDoneWithServerlists();
|
|
|
+ // The balancer got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent two responses.
|
|
|
+ EXPECT_EQ(2U, balancer_servers_[0].service_->response_count());
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, AllServersUnreachableFailFast) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ 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, BalancerServiceImpl::BuildResponseForBackends(ports, {}), 0);
|
|
|
+ const Status status = SendRpc();
|
|
|
+ // The error shouldn't be DEADLINE_EXCEEDED.
|
|
|
+ EXPECT_EQ(StatusCode::UNAVAILABLE, status.error_code());
|
|
|
+ balancers_[0]->NotifyDoneWithServerlists();
|
|
|
+ // The balancer got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+}
|
|
|
+
|
|
|
+// The fallback tests are deferred because the fallback mode hasn't been
|
|
|
+// supported yet.
|
|
|
+
|
|
|
+// TODO(juanlishen): Add TEST_F(SingleBalancerTest, Fallback)
|
|
|
+
|
|
|
+// TODO(juanlishen): Add TEST_F(SingleBalancerTest, FallbackUpdate)
|
|
|
+
|
|
|
+TEST_F(SingleBalancerTest, BackendsRestart) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const size_t kNumRpcsPerAddress = 100;
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::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_);
|
|
|
+ balancers_[0]->NotifyDoneWithServerlists();
|
|
|
+ // The balancer got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ for (size_t i = 0; i < backends_.size(); ++i) {
|
|
|
+ if (backends_[i]->Shutdown()) backend_servers_[i].Shutdown();
|
|
|
+ }
|
|
|
+ CheckRpcSendFailure();
|
|
|
+ for (size_t i = 0; i < num_backends_; ++i) {
|
|
|
+ backends_.emplace_back(new BackendServiceImpl());
|
|
|
+ backend_servers_.emplace_back(ServerThread<BackendService>(
|
|
|
+ "backend", server_host_, backends_.back().get()));
|
|
|
+ }
|
|
|
+ // The following RPC will fail due to the backend ports having changed. It
|
|
|
+ // will nonetheless exercise the xds-roundrobin handling of the RR policy
|
|
|
+ // having gone into shutdown.
|
|
|
+ // TODO(dgq): implement the "backend restart" component as well. We need extra
|
|
|
+ // machinery to either update the LB responses "on the fly" or instruct
|
|
|
+ // backends which ports to restart on.
|
|
|
+ CheckRpcSendFailure();
|
|
|
+}
|
|
|
+
|
|
|
+class UpdatesTest : public XdsEnd2endTest {
|
|
|
+ public:
|
|
|
+ UpdatesTest() : XdsEnd2endTest(4, 3, 0) {}
|
|
|
+};
|
|
|
+
|
|
|
+TEST_F(UpdatesTest, UpdateBalancersButKeepUsingOriginalBalancer) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const std::vector<int> first_backend{GetBackendPorts()[0]};
|
|
|
+ const std::vector<int> second_backend{GetBackendPorts()[1]};
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0);
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 1, BalancerServiceImpl::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, backend_servers_[0].service_->request_count());
|
|
|
+
|
|
|
+ // Balancer 0 got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+
|
|
|
+ gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 ==========");
|
|
|
+ SetNextResolutionForLbChannel({balancer_servers_[1].port_});
|
|
|
+ gpr_log(GPR_INFO, "========= UPDATE 1 DONE ==========");
|
|
|
+
|
|
|
+ EXPECT_EQ(0U, backend_servers_[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 xds continued using it to the
|
|
|
+ // first balancer, which doesn't assign the second backend.
|
|
|
+ EXPECT_EQ(0U, backend_servers_[1].service_->request_count());
|
|
|
+
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(UpdatesTest, UpdateBalancerName) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const std::vector<int> first_backend{GetBackendPorts()[0]};
|
|
|
+ const std::vector<int> second_backend{GetBackendPorts()[1]};
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0);
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 1, BalancerServiceImpl::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, backend_servers_[0].service_->request_count());
|
|
|
+
|
|
|
+ // Balancer 0 got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+
|
|
|
+ std::vector<int> ports;
|
|
|
+ ports.emplace_back(balancer_servers_[1].port_);
|
|
|
+ auto new_lb_channel_response_generator =
|
|
|
+ grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
|
|
|
+ SetNextResolutionForLbChannel(ports, nullptr,
|
|
|
+ new_lb_channel_response_generator.get());
|
|
|
+ gpr_log(GPR_INFO, "========= ABOUT TO UPDATE BALANCER NAME ==========");
|
|
|
+ SetNextResolution({},
|
|
|
+ "{\n"
|
|
|
+ " \"loadBalancingConfig\":[\n"
|
|
|
+ " { \"does_not_exist\":{} },\n"
|
|
|
+ " { \"xds_experimental\":{ \"balancerName\": "
|
|
|
+ "\"fake:///updated_lb\" } }\n"
|
|
|
+ " ]\n"
|
|
|
+ "}",
|
|
|
+ new_lb_channel_response_generator.get());
|
|
|
+ gpr_log(GPR_INFO, "========= UPDATED BALANCER NAME ==========");
|
|
|
+
|
|
|
+ // Wait until update has been processed, as signaled by the second backend
|
|
|
+ // receiving a request.
|
|
|
+ EXPECT_EQ(0U, backend_servers_[1].service_->request_count());
|
|
|
+ WaitForBackend(1);
|
|
|
+
|
|
|
+ backend_servers_[1].service_->ResetCounters();
|
|
|
+ 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, backend_servers_[1].service_->request_count());
|
|
|
+
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[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 xds keeps the initial connection (which
|
|
|
+// by definition is also present in the update).
|
|
|
+TEST_F(UpdatesTest, UpdateBalancersRepeated) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannelAllBalancers();
|
|
|
+ const std::vector<int> first_backend{GetBackendPorts()[0]};
|
|
|
+ const std::vector<int> second_backend{GetBackendPorts()[0]};
|
|
|
+
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0);
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 1, BalancerServiceImpl::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, backend_servers_[0].service_->request_count());
|
|
|
+
|
|
|
+ // Balancer 0 got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+
|
|
|
+ std::vector<int> ports;
|
|
|
+ ports.emplace_back(balancer_servers_[0].port_);
|
|
|
+ ports.emplace_back(balancer_servers_[1].port_);
|
|
|
+ ports.emplace_back(balancer_servers_[2].port_);
|
|
|
+ gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 ==========");
|
|
|
+ SetNextResolutionForLbChannel(ports);
|
|
|
+ gpr_log(GPR_INFO, "========= UPDATE 1 DONE ==========");
|
|
|
+
|
|
|
+ EXPECT_EQ(0U, backend_servers_[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);
|
|
|
+ // xds continued using the original LB call to the first balancer, which
|
|
|
+ // doesn't assign the second backend.
|
|
|
+ EXPECT_EQ(0U, backend_servers_[1].service_->request_count());
|
|
|
+
|
|
|
+ ports.clear();
|
|
|
+ ports.emplace_back(balancer_servers_[0].port_);
|
|
|
+ ports.emplace_back(balancer_servers_[1].port_);
|
|
|
+ gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 2 ==========");
|
|
|
+ SetNextResolutionForLbChannel(ports);
|
|
|
+ gpr_log(GPR_INFO, "========= UPDATE 2 DONE ==========");
|
|
|
+
|
|
|
+ EXPECT_EQ(0U, backend_servers_[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);
|
|
|
+ // xds continued using the original LB call to the first balancer, which
|
|
|
+ // doesn't assign the second backend.
|
|
|
+ EXPECT_EQ(0U, backend_servers_[1].service_->request_count());
|
|
|
+}
|
|
|
+
|
|
|
+TEST_F(UpdatesTest, UpdateBalancersDeadUpdate) {
|
|
|
+ SetNextResolution({}, kDefaultServiceConfig_.c_str());
|
|
|
+ SetNextResolutionForLbChannel({balancer_servers_[0].port_});
|
|
|
+ const std::vector<int> first_backend{GetBackendPorts()[0]};
|
|
|
+ const std::vector<int> second_backend{GetBackendPorts()[1]};
|
|
|
+
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 0, BalancerServiceImpl::BuildResponseForBackends(first_backend, {}), 0);
|
|
|
+ ScheduleResponseForBalancer(
|
|
|
+ 1, BalancerServiceImpl::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, backend_servers_[0].service_->request_count());
|
|
|
+
|
|
|
+ // Kill balancer 0
|
|
|
+ gpr_log(GPR_INFO, "********** ABOUT TO KILL BALANCER 0 *************");
|
|
|
+ if (balancers_[0]->Shutdown()) balancer_servers_[0].Shutdown();
|
|
|
+ gpr_log(GPR_INFO, "********** KILLED BALANCER 0 *************");
|
|
|
+
|
|
|
+ // This is serviced by the existing child 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, backend_servers_[0].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, backend_servers_[1].service_->request_count());
|
|
|
+
|
|
|
+ // Balancer 0 got a single request.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ // and sent a single response.
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[1].service_->response_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+
|
|
|
+ gpr_log(GPR_INFO, "========= ABOUT TO UPDATE 1 ==========");
|
|
|
+ SetNextResolutionForLbChannel({balancer_servers_[1].port_});
|
|
|
+ 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, backend_servers_[1].service_->request_count());
|
|
|
+ WaitForBackend(1);
|
|
|
+
|
|
|
+ // This is serviced by the updated RR policy
|
|
|
+ backend_servers_[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, backend_servers_[1].service_->request_count());
|
|
|
+
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[0].service_->request_count());
|
|
|
+ EXPECT_EQ(1U, balancer_servers_[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(balancer_servers_[1].service_->request_count(), 1U);
|
|
|
+ EXPECT_GE(balancer_servers_[1].service_->response_count(), 1U);
|
|
|
+ EXPECT_LE(balancer_servers_[1].service_->request_count(), 2U);
|
|
|
+ EXPECT_LE(balancer_servers_[1].service_->response_count(), 2U);
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->request_count());
|
|
|
+ EXPECT_EQ(0U, balancer_servers_[2].service_->response_count());
|
|
|
+}
|
|
|
+
|
|
|
+// The re-resolution tests are deferred because they rely on the fallback mode,
|
|
|
+// which hasn't been supported.
|
|
|
+
|
|
|
+// TODO(juanlishen): Add TEST_F(UpdatesTest, ReresolveDeadBackend).
|
|
|
+
|
|
|
+// TODO(juanlishen): Add TEST_F(UpdatesWithClientLoadReportingTest,
|
|
|
+// ReresolveDeadBalancer)
|
|
|
+
|
|
|
+// The drop tests are deferred because the drop handling hasn't been added yet.
|
|
|
+
|
|
|
+// TODO(roth): Add TEST_F(SingleBalancerTest, Drop)
|
|
|
+
|
|
|
+// TODO(roth): Add TEST_F(SingleBalancerTest, DropAllFirst)
|
|
|
+
|
|
|
+// TODO(roth): Add TEST_F(SingleBalancerTest, DropAll)
|
|
|
+
|
|
|
+class SingleBalancerWithClientLoadReportingTest : public XdsEnd2endTest {
|
|
|
+ public:
|
|
|
+ SingleBalancerWithClientLoadReportingTest() : XdsEnd2endTest(4, 1, 3) {}
|
|
|
+};
|
|
|
+
|
|
|
+// The client load reporting tests are deferred because the client load
|
|
|
+// reporting hasn't been supported yet.
|
|
|
+
|
|
|
+// TODO(vpowar): Add TEST_F(SingleBalancerWithClientLoadReportingTest, Vanilla)
|
|
|
+
|
|
|
+// TODO(roth): Add TEST_F(SingleBalancerWithClientLoadReportingTest, Drop)
|
|
|
+
|
|
|
+} // namespace
|
|
|
+} // namespace testing
|
|
|
+} // namespace grpc
|
|
|
+
|
|
|
+int main(int argc, char** argv) {
|
|
|
+ grpc_init();
|
|
|
+ grpc::testing::TestEnvironment env(argc, argv);
|
|
|
+ ::testing::InitGoogleTest(&argc, argv);
|
|
|
+ const auto result = RUN_ALL_TESTS();
|
|
|
+ grpc_shutdown();
|
|
|
+ return result;
|
|
|
+}
|
Juanli Shen