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/*
*
* 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/grpc.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/support/atomic.h"
extern "C" {
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/support/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_exec_ctx* exec_ctx, grpc_call_element* elem,
grpc_metadata_batch* mdb) {
CallData* calld = reinterpret_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 = reinterpret_cast<ChannelData*>(elem->channel_data);
char tmp[GPR_LTOA_MIN_BUFSIZE];
gpr_ltoa(chand->error_code, tmp);
calld->status.md = grpc_mdelem_from_slices(
exec_ctx, GRPC_MDSTR_GRPC_STATUS, grpc_slice_from_copied_string(tmp));
calld->details.md = grpc_mdelem_from_slices(
exec_ctx, 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_exec_ctx* exec_ctx, grpc_call_element* elem,
grpc_transport_stream_op_batch* op) {
CallData* calld = reinterpret_cast<CallData*>(elem->call_data);
if (op->recv_initial_metadata) {
fill_metadata(exec_ctx, elem,
op->payload->recv_initial_metadata.recv_initial_metadata);
} else if (op->recv_trailing_metadata) {
fill_metadata(exec_ctx, elem,
op->payload->recv_trailing_metadata.recv_trailing_metadata);
}
grpc_transport_stream_op_batch_finish_with_failure(
exec_ctx, op, GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"),
calld->call_combiner);
}
static void lame_get_channel_info(grpc_exec_ctx* exec_ctx,
grpc_channel_element* elem,
const grpc_channel_info* channel_info) {}
static void lame_start_transport_op(grpc_exec_ctx* exec_ctx,
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(exec_ctx, op->on_connectivity_state_change,
GRPC_ERROR_NONE);
}
if (op->send_ping != nullptr) {
GRPC_CLOSURE_SCHED(
exec_ctx, op->send_ping,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"));
}
GRPC_ERROR_UNREF(op->disconnect_with_error);
if (op->on_consumed != nullptr) {
GRPC_CLOSURE_SCHED(exec_ctx, op->on_consumed, GRPC_ERROR_NONE);
}
}
static grpc_error* init_call_elem(grpc_exec_ctx* exec_ctx,
grpc_call_element* elem,
const grpc_call_element_args* args) {
CallData* calld = reinterpret_cast<CallData*>(elem->call_data);
calld->call_combiner = args->call_combiner;
return GRPC_ERROR_NONE;
}
static void destroy_call_elem(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
const grpc_call_final_info* final_info,
grpc_closure* then_schedule_closure) {
GRPC_CLOSURE_SCHED(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE);
}
static grpc_error* init_channel_elem(grpc_exec_ctx* exec_ctx,
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_exec_ctx* exec_ctx,
grpc_channel_element* elem) {}
} // namespace
} // namespace grpc_core
extern "C" 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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_channel_element* elem;
grpc_channel* channel = grpc_channel_create(
&exec_ctx, 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 = reinterpret_cast<grpc_core::ChannelData*>(elem->channel_data);
chand->error_code = error_code;
chand->error_message = error_message;
grpc_exec_ctx_finish(&exec_ctx);
return channel;
}
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