| /* |
| * |
| * Copyright 2015 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 <grpc/support/port_platform.h> |
| |
| #include <grpc/grpc.h> |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/gprpp/atomic.h" |
| |
| #include "src/core/lib/channel/channel_stack.h" |
| #include "src/core/lib/gpr/string.h" |
| #include "src/core/lib/surface/api_trace.h" |
| #include "src/core/lib/surface/call.h" |
| #include "src/core/lib/surface/channel.h" |
| #include "src/core/lib/surface/lame_client.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| |
| namespace grpc_core { |
| |
| namespace { |
| |
| struct CallData { |
| grpc_call_combiner* call_combiner; |
| grpc_linked_mdelem status; |
| grpc_linked_mdelem details; |
| grpc_core::atomic<bool> filled_metadata; |
| }; |
| |
| struct ChannelData { |
| grpc_status_code error_code; |
| const char* error_message; |
| }; |
| |
| static void fill_metadata(grpc_call_element* elem, grpc_metadata_batch* mdb) { |
| CallData* calld = static_cast<CallData*>(elem->call_data); |
| bool expected = false; |
| if (!calld->filled_metadata.compare_exchange_strong( |
| expected, true, grpc_core::memory_order_relaxed, |
| grpc_core::memory_order_relaxed)) { |
| return; |
| } |
| ChannelData* chand = static_cast<ChannelData*>(elem->channel_data); |
| char tmp[GPR_LTOA_MIN_BUFSIZE]; |
| gpr_ltoa(chand->error_code, tmp); |
| calld->status.md = grpc_mdelem_from_slices( |
| GRPC_MDSTR_GRPC_STATUS, grpc_slice_from_copied_string(tmp)); |
| calld->details.md = grpc_mdelem_from_slices( |
| GRPC_MDSTR_GRPC_MESSAGE, |
| grpc_slice_from_copied_string(chand->error_message)); |
| calld->status.prev = calld->details.next = nullptr; |
| calld->status.next = &calld->details; |
| calld->details.prev = &calld->status; |
| mdb->list.head = &calld->status; |
| mdb->list.tail = &calld->details; |
| mdb->list.count = 2; |
| mdb->deadline = GRPC_MILLIS_INF_FUTURE; |
| } |
| |
| static void lame_start_transport_stream_op_batch( |
| grpc_call_element* elem, grpc_transport_stream_op_batch* op) { |
| CallData* calld = static_cast<CallData*>(elem->call_data); |
| if (op->recv_initial_metadata) { |
| fill_metadata(elem, |
| op->payload->recv_initial_metadata.recv_initial_metadata); |
| } else if (op->recv_trailing_metadata) { |
| fill_metadata(elem, |
| op->payload->recv_trailing_metadata.recv_trailing_metadata); |
| } |
| grpc_transport_stream_op_batch_finish_with_failure( |
| op, GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"), |
| calld->call_combiner); |
| } |
| |
| static void lame_get_channel_info(grpc_channel_element* elem, |
| const grpc_channel_info* channel_info) {} |
| |
| static void lame_start_transport_op(grpc_channel_element* elem, |
| grpc_transport_op* op) { |
| if (op->on_connectivity_state_change) { |
| GPR_ASSERT(*op->connectivity_state != GRPC_CHANNEL_SHUTDOWN); |
| *op->connectivity_state = GRPC_CHANNEL_SHUTDOWN; |
| GRPC_CLOSURE_SCHED(op->on_connectivity_state_change, GRPC_ERROR_NONE); |
| } |
| if (op->send_ping.on_initiate != nullptr) { |
| GRPC_CLOSURE_SCHED( |
| op->send_ping.on_initiate, |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel")); |
| } |
| if (op->send_ping.on_ack != nullptr) { |
| GRPC_CLOSURE_SCHED( |
| op->send_ping.on_ack, |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel")); |
| } |
| GRPC_ERROR_UNREF(op->disconnect_with_error); |
| if (op->on_consumed != nullptr) { |
| GRPC_CLOSURE_SCHED(op->on_consumed, GRPC_ERROR_NONE); |
| } |
| } |
| |
| static grpc_error* init_call_elem(grpc_call_element* elem, |
| const grpc_call_element_args* args) { |
| CallData* calld = static_cast<CallData*>(elem->call_data); |
| calld->call_combiner = args->call_combiner; |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void destroy_call_elem(grpc_call_element* elem, |
| const grpc_call_final_info* final_info, |
| grpc_closure* then_schedule_closure) { |
| GRPC_CLOSURE_SCHED(then_schedule_closure, GRPC_ERROR_NONE); |
| } |
| |
| static grpc_error* init_channel_elem(grpc_channel_element* elem, |
| grpc_channel_element_args* args) { |
| GPR_ASSERT(args->is_first); |
| GPR_ASSERT(args->is_last); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void destroy_channel_elem(grpc_channel_element* elem) {} |
| |
| } // namespace |
| |
| } // namespace grpc_core |
| |
| const grpc_channel_filter grpc_lame_filter = { |
| grpc_core::lame_start_transport_stream_op_batch, |
| grpc_core::lame_start_transport_op, |
| sizeof(grpc_core::CallData), |
| grpc_core::init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| grpc_core::destroy_call_elem, |
| sizeof(grpc_core::ChannelData), |
| grpc_core::init_channel_elem, |
| grpc_core::destroy_channel_elem, |
| grpc_core::lame_get_channel_info, |
| "lame-client", |
| }; |
| |
| #define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack*)((c) + 1)) |
| |
| grpc_channel* grpc_lame_client_channel_create(const char* target, |
| grpc_status_code error_code, |
| const char* error_message) { |
| grpc_core::ExecCtx exec_ctx; |
| grpc_channel_element* elem; |
| grpc_channel* channel = |
| grpc_channel_create(target, nullptr, GRPC_CLIENT_LAME_CHANNEL, nullptr); |
| elem = grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0); |
| GRPC_API_TRACE( |
| "grpc_lame_client_channel_create(target=%s, error_code=%d, " |
| "error_message=%s)", |
| 3, (target, (int)error_code, error_message)); |
| GPR_ASSERT(elem->filter == &grpc_lame_filter); |
| auto chand = static_cast<grpc_core::ChannelData*>(elem->channel_data); |
| chand->error_code = error_code; |
| chand->error_message = error_message; |
| |
| return channel; |
| } |