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//
// Copyright 2019 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 "src/core/ext/filters/client_channel/backend_metric.h"
#include "absl/strings/string_view.h"
#include "upb/upb.hpp"
#include "xds/data/orca/v3/orca_load_report.upb.h"
namespace grpc_core {
namespace {
template <typename EntryType>
std::map<absl::string_view, double> ParseMap(
xds_data_orca_v3_OrcaLoadReport* msg,
const EntryType* (*entry_func)(const xds_data_orca_v3_OrcaLoadReport*,
size_t*),
upb_StringView (*key_func)(const EntryType*),
double (*value_func)(const EntryType*), Arena* arena) {
std::map<absl::string_view, double> result;
size_t i = kUpb_Map_Begin;
while (true) {
const auto* entry = entry_func(msg, &i);
if (entry == nullptr) break;
upb_StringView key_view = key_func(entry);
char* key = static_cast<char*>(arena->Alloc(key_view.size));
memcpy(key, key_view.data, key_view.size);
result[absl::string_view(key, key_view.size)] = value_func(entry);
}
return result;
}
} // namespace
const LoadBalancingPolicy::BackendMetricAccessor::BackendMetricData*
ParseBackendMetricData(const Slice& serialized_load_report, Arena* arena) {
upb::Arena upb_arena;
xds_data_orca_v3_OrcaLoadReport* msg = xds_data_orca_v3_OrcaLoadReport_parse(
reinterpret_cast<const char*>(serialized_load_report.begin()),
serialized_load_report.size(), upb_arena.ptr());
if (msg == nullptr) return nullptr;
auto* backend_metric_data = arena->New<
LoadBalancingPolicy::BackendMetricAccessor::BackendMetricData>();
backend_metric_data->cpu_utilization =
xds_data_orca_v3_OrcaLoadReport_cpu_utilization(msg);
backend_metric_data->mem_utilization =
xds_data_orca_v3_OrcaLoadReport_mem_utilization(msg);
backend_metric_data->requests_per_second =
xds_data_orca_v3_OrcaLoadReport_rps(msg);
backend_metric_data->request_cost =
ParseMap<xds_data_orca_v3_OrcaLoadReport_RequestCostEntry>(
msg, xds_data_orca_v3_OrcaLoadReport_request_cost_next,
xds_data_orca_v3_OrcaLoadReport_RequestCostEntry_key,
xds_data_orca_v3_OrcaLoadReport_RequestCostEntry_value, arena);
backend_metric_data->utilization =
ParseMap<xds_data_orca_v3_OrcaLoadReport_UtilizationEntry>(
msg, xds_data_orca_v3_OrcaLoadReport_utilization_next,
xds_data_orca_v3_OrcaLoadReport_UtilizationEntry_key,
xds_data_orca_v3_OrcaLoadReport_UtilizationEntry_value, arena);
return backend_metric_data;
}
} // namespace grpc_core
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