| /* |
| * |
| * Copyright 2017 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| |
| #include "src/core/ext/filters/client_channel/parse_address.h" |
| #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" |
| #include "src/core/ext/filters/client_channel/resolver_registry.h" |
| #include "src/core/ext/filters/client_channel/server_address.h" |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/gprpp/ref_counted_ptr.h" |
| #include "src/core/lib/iomgr/work_serializer.h" |
| #include "src/core/lib/security/credentials/fake/fake_credentials.h" |
| |
| #include "test/core/util/test_config.h" |
| |
| class ResultHandler : public grpc_core::Resolver::ResultHandler { |
| public: |
| void SetExpectedAndEvent(grpc_core::Resolver::Result expected, |
| gpr_event* ev) { |
| GPR_ASSERT(ev_ == nullptr); |
| expected_ = std::move(expected); |
| ev_ = ev; |
| } |
| |
| void ReturnResult(grpc_core::Resolver::Result actual) override { |
| GPR_ASSERT(ev_ != nullptr); |
| // We only check the addresses, because that's the only thing |
| // explicitly set by the test via |
| // FakeResolverResponseGenerator::SetResponse(). |
| GPR_ASSERT(actual.addresses.size() == expected_.addresses.size()); |
| for (size_t i = 0; i < expected_.addresses.size(); ++i) { |
| GPR_ASSERT(actual.addresses[i] == expected_.addresses[i]); |
| } |
| gpr_event_set(ev_, (void*)1); |
| ev_ = nullptr; |
| } |
| |
| void ReturnError(grpc_error* /*error*/) override {} |
| |
| private: |
| grpc_core::Resolver::Result expected_; |
| gpr_event* ev_ = nullptr; |
| }; |
| |
| static grpc_core::OrphanablePtr<grpc_core::Resolver> build_fake_resolver( |
| std::shared_ptr<grpc_core::WorkSerializer> work_serializer, |
| grpc_core::FakeResolverResponseGenerator* response_generator, |
| std::unique_ptr<grpc_core::Resolver::ResultHandler> result_handler) { |
| grpc_core::ResolverFactory* factory = |
| grpc_core::ResolverRegistry::LookupResolverFactory("fake"); |
| grpc_arg generator_arg = |
| grpc_core::FakeResolverResponseGenerator::MakeChannelArg( |
| response_generator); |
| grpc_channel_args channel_args = {1, &generator_arg}; |
| grpc_core::ResolverArgs args; |
| args.args = &channel_args; |
| args.work_serializer = std::move(work_serializer); |
| args.result_handler = std::move(result_handler); |
| grpc_core::OrphanablePtr<grpc_core::Resolver> resolver = |
| factory->CreateResolver(std::move(args)); |
| return resolver; |
| } |
| |
| // Create a new resolution containing 2 addresses. |
| static grpc_core::Resolver::Result create_new_resolver_result() { |
| static size_t test_counter = 0; |
| const size_t num_addresses = 2; |
| char* uri_string; |
| // Create address list. |
| grpc_core::Resolver::Result result; |
| for (size_t i = 0; i < num_addresses; ++i) { |
| gpr_asprintf(&uri_string, "ipv4:127.0.0.1:100%" PRIuPTR, |
| test_counter * num_addresses + i); |
| grpc_uri* uri = grpc_uri_parse(uri_string, true); |
| grpc_resolved_address address; |
| GPR_ASSERT(grpc_parse_uri(uri, &address)); |
| absl::InlinedVector<grpc_arg, 2> args_to_add; |
| result.addresses.emplace_back( |
| address.addr, address.len, |
| grpc_channel_args_copy_and_add(nullptr, nullptr, 0)); |
| grpc_uri_destroy(uri); |
| gpr_free(uri_string); |
| } |
| ++test_counter; |
| return result; |
| } |
| |
| static void test_fake_resolver() { |
| grpc_core::ExecCtx exec_ctx; |
| std::shared_ptr<grpc_core::WorkSerializer> work_serializer = |
| std::make_shared<grpc_core::WorkSerializer>(); |
| // Create resolver. |
| ResultHandler* result_handler = new ResultHandler(); |
| grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator> |
| response_generator = |
| grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>(); |
| grpc_core::OrphanablePtr<grpc_core::Resolver> resolver = build_fake_resolver( |
| work_serializer, response_generator.get(), |
| std::unique_ptr<grpc_core::Resolver::ResultHandler>(result_handler)); |
| GPR_ASSERT(resolver.get() != nullptr); |
| resolver->StartLocked(); |
| // Test 1: normal resolution. |
| // next_results != NULL, reresolution_results == NULL. |
| // Expected response is next_results. |
| gpr_log(GPR_INFO, "TEST 1"); |
| grpc_core::Resolver::Result result = create_new_resolver_result(); |
| gpr_event ev1; |
| gpr_event_init(&ev1); |
| result_handler->SetExpectedAndEvent(result, &ev1); |
| response_generator->SetResponse(std::move(result)); |
| grpc_core::ExecCtx::Get()->Flush(); |
| GPR_ASSERT(gpr_event_wait(&ev1, grpc_timeout_seconds_to_deadline(5)) != |
| nullptr); |
| // Test 2: update resolution. |
| // next_results != NULL, reresolution_results == NULL. |
| // Expected response is next_results. |
| gpr_log(GPR_INFO, "TEST 2"); |
| result = create_new_resolver_result(); |
| gpr_event ev2; |
| gpr_event_init(&ev2); |
| result_handler->SetExpectedAndEvent(result, &ev2); |
| response_generator->SetResponse(std::move(result)); |
| grpc_core::ExecCtx::Get()->Flush(); |
| GPR_ASSERT(gpr_event_wait(&ev2, grpc_timeout_seconds_to_deadline(5)) != |
| nullptr); |
| // Test 3: normal re-resolution. |
| // next_results == NULL, reresolution_results != NULL. |
| // Expected response is reresolution_results. |
| gpr_log(GPR_INFO, "TEST 3"); |
| grpc_core::Resolver::Result reresolution_result = |
| create_new_resolver_result(); |
| gpr_event ev3; |
| gpr_event_init(&ev3); |
| result_handler->SetExpectedAndEvent(reresolution_result, &ev3); |
| // Set reresolution_results. |
| // No result will be returned until re-resolution is requested. |
| response_generator->SetReresolutionResponse(reresolution_result); |
| grpc_core::ExecCtx::Get()->Flush(); |
| // Trigger a re-resolution. |
| resolver->RequestReresolutionLocked(); |
| grpc_core::ExecCtx::Get()->Flush(); |
| GPR_ASSERT(gpr_event_wait(&ev3, grpc_timeout_seconds_to_deadline(5)) != |
| nullptr); |
| // Test 4: repeat re-resolution. |
| // next_results == NULL, reresolution_results != NULL. |
| // Expected response is reresolution_results. |
| gpr_log(GPR_INFO, "TEST 4"); |
| gpr_event ev4; |
| gpr_event_init(&ev4); |
| result_handler->SetExpectedAndEvent(std::move(reresolution_result), &ev4); |
| // Trigger a re-resolution. |
| resolver->RequestReresolutionLocked(); |
| grpc_core::ExecCtx::Get()->Flush(); |
| GPR_ASSERT(gpr_event_wait(&ev4, grpc_timeout_seconds_to_deadline(5)) != |
| nullptr); |
| // Test 5: normal resolution. |
| // next_results != NULL, reresolution_results != NULL. |
| // Expected response is next_results. |
| gpr_log(GPR_INFO, "TEST 5"); |
| result = create_new_resolver_result(); |
| gpr_event ev5; |
| gpr_event_init(&ev5); |
| result_handler->SetExpectedAndEvent(result, &ev5); |
| response_generator->SetResponse(std::move(result)); |
| grpc_core::ExecCtx::Get()->Flush(); |
| GPR_ASSERT(gpr_event_wait(&ev5, grpc_timeout_seconds_to_deadline(5)) != |
| nullptr); |
| // Test 6: no-op. |
| // Requesting a new resolution without setting the response shouldn't trigger |
| // the resolution callback. |
| gpr_log(GPR_INFO, "TEST 6"); |
| gpr_event ev6; |
| gpr_event_init(&ev6); |
| result_handler->SetExpectedAndEvent(grpc_core::Resolver::Result(), &ev6); |
| GPR_ASSERT(gpr_event_wait(&ev6, grpc_timeout_milliseconds_to_deadline(100)) == |
| nullptr); |
| // Clean up. |
| resolver.reset(); |
| } |
| |
| int main(int argc, char** argv) { |
| grpc::testing::TestEnvironment env(argc, argv); |
| grpc_init(); |
| |
| test_fake_resolver(); |
| |
| grpc_shutdown(); |
| return 0; |
| } |