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//
// Copyright 2022 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 <stddef.h>
#include <stdint.h>
#include <map>
#include <memory>
#include <utility>
#include "absl/base/thread_annotations.h"
#include "absl/strings/string_view.h"
#include "absl/time/time.h"
#include "absl/types/optional.h"
#include "google/protobuf/duration.upb.h"
#include "upb/base/string_view.h"
#include "upb/upb.hpp"
#include "xds/data/orca/v3/orca_load_report.upb.h"
#include "xds/service/orca/v3/orca.upb.h"
#include <grpc/event_engine/event_engine.h>
#include <grpc/support/log.h>
#include <grpcpp/ext/orca_service.h>
#include <grpcpp/ext/server_metric_recorder.h>
#include <grpcpp/impl/rpc_method.h>
#include <grpcpp/impl/rpc_service_method.h>
#include <grpcpp/impl/server_callback_handlers.h>
#include <grpcpp/impl/sync.h>
#include <grpcpp/server_context.h>
#include <grpcpp/support/byte_buffer.h>
#include <grpcpp/support/server_callback.h>
#include <grpcpp/support/slice.h>
#include <grpcpp/support/status.h>
#include "src/core/ext/filters/client_channel/lb_policy/backend_metric_data.h"
#include "src/core/lib/event_engine/default_event_engine.h"
#include "src/core/lib/gprpp/debug_location.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/cpp/server/backend_metric_recorder.h"
namespace grpc {
namespace experimental {
using ::grpc_event_engine::experimental::EventEngine;
//
// OrcaService::Reactor
//
class OrcaService::Reactor : public ServerWriteReactor<ByteBuffer>,
public grpc_core::RefCounted<Reactor> {
public:
explicit Reactor(OrcaService* service, const ByteBuffer* request_buffer)
: RefCounted("OrcaService::Reactor"),
service_(service),
engine_(grpc_event_engine::experimental::GetDefaultEventEngine()) {
// Get slice from request.
Slice slice;
GPR_ASSERT(request_buffer->DumpToSingleSlice(&slice).ok());
// Parse request proto.
upb::Arena arena;
xds_service_orca_v3_OrcaLoadReportRequest* request =
xds_service_orca_v3_OrcaLoadReportRequest_parse(
reinterpret_cast<const char*>(slice.begin()), slice.size(),
arena.ptr());
if (request == nullptr) {
Finish(Status(StatusCode::INTERNAL, "could not parse request proto"));
return;
}
const auto* duration_proto =
xds_service_orca_v3_OrcaLoadReportRequest_report_interval(request);
if (duration_proto != nullptr) {
report_interval_ = grpc_core::Duration::FromSecondsAndNanoseconds(
google_protobuf_Duration_seconds(duration_proto),
google_protobuf_Duration_nanos(duration_proto));
}
auto min_interval = grpc_core::Duration::Milliseconds(
service_->min_report_duration_ / absl::Milliseconds(1));
if (report_interval_ < min_interval) report_interval_ = min_interval;
// Send initial response.
SendResponse();
}
void OnWriteDone(bool ok) override {
if (!ok) {
Finish(Status(StatusCode::UNKNOWN, "write failed"));
return;
}
response_.Clear();
if (!MaybeScheduleTimer()) {
Finish(Status(StatusCode::UNKNOWN, "call cancelled by client"));
}
}
void OnCancel() override {
if (MaybeCancelTimer()) {
Finish(Status(StatusCode::UNKNOWN, "call cancelled by client"));
}
}
void OnDone() override {
// Free the initial ref from instantiation.
Unref(DEBUG_LOCATION, "OnDone");
}
private:
void SendResponse() {
Slice response_slice = service_->GetOrCreateSerializedResponse();
ByteBuffer response_buffer(&response_slice, 1);
response_.Swap(&response_buffer);
StartWrite(&response_);
}
bool MaybeScheduleTimer() {
grpc::internal::MutexLock lock(&timer_mu_);
if (cancelled_) return false;
timer_handle_ = engine_->RunAfter(
report_interval_,
[self = Ref(DEBUG_LOCATION, "Orca Service")] { self->OnTimer(); });
return true;
}
bool MaybeCancelTimer() {
grpc::internal::MutexLock lock(&timer_mu_);
cancelled_ = true;
if (timer_handle_.has_value() && engine_->Cancel(*timer_handle_)) {
timer_handle_.reset();
return true;
}
return false;
}
void OnTimer() {
grpc_core::ApplicationCallbackExecCtx callback_exec_ctx;
grpc_core::ExecCtx exec_ctx;
grpc::internal::MutexLock lock(&timer_mu_);
timer_handle_.reset();
SendResponse();
}
OrcaService* service_;
grpc::internal::Mutex timer_mu_;
absl::optional<EventEngine::TaskHandle> timer_handle_
ABSL_GUARDED_BY(&timer_mu_);
bool cancelled_ ABSL_GUARDED_BY(&timer_mu_) = false;
grpc_core::Duration report_interval_;
ByteBuffer response_;
std::shared_ptr<grpc_event_engine::experimental::EventEngine> engine_;
};
//
// OrcaService
//
OrcaService::OrcaService(ServerMetricRecorder* const server_metric_recorder,
Options options)
: server_metric_recorder_(server_metric_recorder),
min_report_duration_(options.min_report_duration) {
GPR_ASSERT(server_metric_recorder_ != nullptr);
AddMethod(new internal::RpcServiceMethod(
"/xds.service.orca.v3.OpenRcaService/StreamCoreMetrics",
internal::RpcMethod::SERVER_STREAMING, /*handler=*/nullptr));
MarkMethodCallback(
0, new internal::CallbackServerStreamingHandler<ByteBuffer, ByteBuffer>(
[this](CallbackServerContext* /*ctx*/, const ByteBuffer* request) {
return new Reactor(this, request);
}));
}
Slice OrcaService::GetOrCreateSerializedResponse() {
grpc::internal::MutexLock lock(&mu_);
std::shared_ptr<const ServerMetricRecorder::BackendMetricDataState> result =
server_metric_recorder_->GetMetricsIfChanged();
if (!response_slice_seq_.has_value() ||
*response_slice_seq_ != result->sequence_number) {
const auto& data = result->data;
upb::Arena arena;
xds_data_orca_v3_OrcaLoadReport* response =
xds_data_orca_v3_OrcaLoadReport_new(arena.ptr());
if (data.cpu_utilization != -1) {
xds_data_orca_v3_OrcaLoadReport_set_cpu_utilization(response,
data.cpu_utilization);
}
if (data.mem_utilization != -1) {
xds_data_orca_v3_OrcaLoadReport_set_mem_utilization(response,
data.mem_utilization);
}
if (data.application_utilization != -1) {
xds_data_orca_v3_OrcaLoadReport_set_application_utilization(
response, data.application_utilization);
}
if (data.qps != -1) {
xds_data_orca_v3_OrcaLoadReport_set_rps_fractional(response, data.qps);
}
if (data.eps != -1) {
xds_data_orca_v3_OrcaLoadReport_set_eps(response, data.eps);
}
for (const auto& u : data.utilization) {
xds_data_orca_v3_OrcaLoadReport_utilization_set(
response,
upb_StringView_FromDataAndSize(u.first.data(), u.first.size()),
u.second, arena.ptr());
}
size_t buf_length;
char* buf = xds_data_orca_v3_OrcaLoadReport_serialize(response, arena.ptr(),
&buf_length);
response_slice_.emplace(buf, buf_length);
response_slice_seq_ = result->sequence_number;
}
return Slice(*response_slice_);
}
} // namespace experimental
} // namespace grpc
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