| // |
| // 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 <inttypes.h> |
| #include <string.h> |
| |
| #include <algorithm> |
| #include <functional> |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/status/status.h" |
| #include "absl/status/statusor.h" |
| #include "absl/strings/string_view.h" |
| |
| #include <grpc/byte_buffer.h> |
| #include <grpc/grpc.h> |
| #include <grpc/impl/propagation_bits.h> |
| #include <grpc/slice.h> |
| #include <grpc/status.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/config/core_configuration.h" |
| #include "src/core/lib/gpr/useful.h" |
| #include "src/core/lib/gprpp/orphanable.h" |
| #include "src/core/lib/gprpp/ref_counted_ptr.h" |
| #include "src/core/lib/json/json.h" |
| #include "src/core/lib/load_balancing/lb_policy.h" |
| #include "src/core/lib/load_balancing/lb_policy_factory.h" |
| #include "test/core/end2end/cq_verifier.h" |
| #include "test/core/end2end/end2end_tests.h" |
| #include "test/core/util/test_config.h" |
| #include "test/core/util/test_lb_policies.h" |
| |
| namespace grpc_core { |
| namespace { |
| |
| constexpr absl::string_view kDropPolicyName = "drop_lb"; |
| |
| class DropPolicy : public LoadBalancingPolicy { |
| public: |
| explicit DropPolicy(Args args) : LoadBalancingPolicy(std::move(args)) {} |
| |
| absl::string_view name() const override { return kDropPolicyName; } |
| |
| absl::Status UpdateLocked(UpdateArgs) override { |
| channel_control_helper()->UpdateState(GRPC_CHANNEL_READY, absl::Status(), |
| MakeRefCounted<DropPicker>()); |
| return absl::OkStatus(); |
| } |
| |
| void ResetBackoffLocked() override {} |
| void ShutdownLocked() override {} |
| |
| private: |
| class DropPicker : public SubchannelPicker { |
| public: |
| PickResult Pick(PickArgs /*args*/) override { |
| return PickResult::Drop( |
| absl::UnavailableError("Call dropped by drop LB policy")); |
| } |
| }; |
| }; |
| |
| class DropLbConfig : public LoadBalancingPolicy::Config { |
| public: |
| absl::string_view name() const override { return kDropPolicyName; } |
| }; |
| |
| class DropPolicyFactory : public LoadBalancingPolicyFactory { |
| public: |
| OrphanablePtr<LoadBalancingPolicy> CreateLoadBalancingPolicy( |
| LoadBalancingPolicy::Args args) const override { |
| return MakeOrphanable<DropPolicy>(std::move(args)); |
| } |
| |
| absl::string_view name() const override { return kDropPolicyName; } |
| |
| absl::StatusOr<RefCountedPtr<LoadBalancingPolicy::Config>> |
| ParseLoadBalancingConfig(const Json& /*json*/) const override { |
| return MakeRefCounted<DropLbConfig>(); |
| } |
| }; |
| |
| std::vector<PickArgsSeen>* g_pick_args_vector = nullptr; |
| |
| void RegisterDropPolicy(CoreConfiguration::Builder* builder) { |
| builder->lb_policy_registry()->RegisterLoadBalancingPolicyFactory( |
| std::make_unique<DropPolicyFactory>()); |
| } |
| |
| } // namespace |
| } // namespace grpc_core |
| |
| static std::unique_ptr<CoreTestFixture> begin_test( |
| const CoreTestConfiguration& config, const char* test_name, |
| grpc_channel_args* client_args, grpc_channel_args* server_args) { |
| gpr_log(GPR_INFO, "Running test: %s/%s", test_name, config.name); |
| auto f = config.create_fixture(grpc_core::ChannelArgs::FromC(client_args), |
| grpc_core::ChannelArgs::FromC(server_args)); |
| f->InitServer(grpc_core::ChannelArgs::FromC(server_args)); |
| f->InitClient(grpc_core::ChannelArgs::FromC(client_args)); |
| return f; |
| } |
| |
| // Tests that we don't retry when the LB policy drops a call, |
| // even when there is retry configuration in the service config. |
| // - 1 retry allowed for UNAVAILABLE status |
| // - first attempt returns UNAVAILABLE due to LB drop but does not retry |
| static void test_retry_lb_drop(const CoreTestConfiguration& config) { |
| grpc_call* c; |
| grpc_op ops[6]; |
| grpc_op* op; |
| grpc_metadata_array initial_metadata_recv; |
| grpc_metadata_array trailing_metadata_recv; |
| grpc_slice request_payload_slice = grpc_slice_from_static_string("foo"); |
| grpc_byte_buffer* request_payload = |
| grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
| grpc_byte_buffer* response_payload_recv = nullptr; |
| grpc_status_code status; |
| grpc_call_error error; |
| grpc_slice details; |
| |
| std::vector<grpc_core::PickArgsSeen> pick_args_seen; |
| grpc_core::g_pick_args_vector = &pick_args_seen; |
| |
| grpc_arg args[] = { |
| grpc_channel_arg_string_create( |
| const_cast<char*>(GRPC_ARG_SERVICE_CONFIG), |
| const_cast<char*>( |
| "{\n" |
| " \"loadBalancingConfig\": [ {\n" |
| " \"test_pick_args_lb\": {}\n" |
| " } ],\n" |
| " \"methodConfig\": [ {\n" |
| " \"name\": [\n" |
| " { \"service\": \"service\", \"method\": \"method\" }\n" |
| " ],\n" |
| " \"retryPolicy\": {\n" |
| " \"maxAttempts\": 2,\n" |
| " \"initialBackoff\": \"1s\",\n" |
| " \"maxBackoff\": \"120s\",\n" |
| " \"backoffMultiplier\": 1.6,\n" |
| " \"retryableStatusCodes\": [ \"UNAVAILABLE\" ]\n" |
| " }\n" |
| " } ]\n" |
| "}")), |
| }; |
| grpc_channel_args client_args = {GPR_ARRAY_SIZE(args), args}; |
| auto f = begin_test(config, "retry_lb_drop", &client_args, nullptr); |
| |
| grpc_core::CqVerifier cqv(f->cq()); |
| |
| gpr_timespec deadline = grpc_timeout_seconds_to_deadline(5); |
| c = grpc_channel_create_call(f->client(), nullptr, GRPC_PROPAGATE_DEFAULTS, |
| f->cq(), |
| grpc_slice_from_static_string("/service/method"), |
| nullptr, deadline, nullptr); |
| GPR_ASSERT(c); |
| |
| grpc_metadata_array_init(&initial_metadata_recv); |
| grpc_metadata_array_init(&trailing_metadata_recv); |
| |
| memset(ops, 0, sizeof(ops)); |
| op = ops; |
| op->op = GRPC_OP_SEND_INITIAL_METADATA; |
| op->data.send_initial_metadata.count = 0; |
| op++; |
| op->op = GRPC_OP_SEND_MESSAGE; |
| op->data.send_message.send_message = request_payload; |
| op++; |
| op->op = GRPC_OP_RECV_MESSAGE; |
| op->data.recv_message.recv_message = &response_payload_recv; |
| op++; |
| op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT; |
| op++; |
| op->op = GRPC_OP_RECV_INITIAL_METADATA; |
| op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv; |
| op++; |
| op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; |
| op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv; |
| op->data.recv_status_on_client.status = &status; |
| op->data.recv_status_on_client.status_details = &details; |
| op++; |
| error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), |
| grpc_core::CqVerifier::tag(1), nullptr); |
| GPR_ASSERT(GRPC_CALL_OK == error); |
| |
| cqv.Expect(grpc_core::CqVerifier::tag(1), true); |
| cqv.Verify(); |
| |
| GPR_ASSERT(status == GRPC_STATUS_UNAVAILABLE); |
| GPR_ASSERT(0 == |
| grpc_slice_str_cmp(details, "Call dropped by drop LB policy")); |
| |
| grpc_slice_unref(details); |
| grpc_metadata_array_destroy(&initial_metadata_recv); |
| grpc_metadata_array_destroy(&trailing_metadata_recv); |
| grpc_byte_buffer_destroy(request_payload); |
| grpc_byte_buffer_destroy(response_payload_recv); |
| |
| grpc_call_unref(c); |
| |
| gpr_log(GPR_INFO, "NUMBER OF LB PICKS: %" PRIuPTR, pick_args_seen.size()); |
| GPR_ASSERT(pick_args_seen.size() == 1); |
| |
| grpc_core::g_pick_args_vector = nullptr; |
| } |
| |
| void retry_lb_drop(const CoreTestConfiguration& config) { |
| GPR_ASSERT(config.feature_mask & FEATURE_MASK_SUPPORTS_CLIENT_CHANNEL); |
| test_retry_lb_drop(config); |
| } |
| |
| void retry_lb_drop_pre_init(void) { |
| grpc_core::CoreConfiguration::RegisterBuilder( |
| [](grpc_core::CoreConfiguration::Builder* builder) { |
| grpc_core::RegisterTestPickArgsLoadBalancingPolicy( |
| builder, |
| [](const grpc_core::PickArgsSeen& pick_args) { |
| GPR_ASSERT(grpc_core::g_pick_args_vector != nullptr); |
| grpc_core::g_pick_args_vector->push_back(pick_args); |
| }, |
| grpc_core::kDropPolicyName); |
| }); |
| grpc_core::CoreConfiguration::RegisterBuilder(grpc_core::RegisterDropPolicy); |
| } |