examples/cpp/otel/codelab/util.cc

//
//
// Copyright 2024 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.
//
//

// Explicitly define HAVE_ABSEIL to avoid conflict with OTel's Abseil
// version. Refer
// https://github.com/open-telemetry/opentelemetry-cpp/issues/1042.
#ifndef HAVE_ABSEIL
#define HAVE_ABSEIL
#endif

#include "opentelemetry/sdk/metrics/view/instrument_selector_factory.h"
#include "opentelemetry/sdk/metrics/view/meter_selector_factory.h"
#include "opentelemetry/sdk/metrics/view/view_factory.h"

#include <grpcpp/grpcpp.h>

#ifdef BAZEL_BUILD
#include "examples/cpp/otel/codelab/util.h"
#include "examples/protos/helloworld.grpc.pb.h"
#else
#include "helloworld.grpc.pb.h"
#include "util.h"
#endif

using grpc::CallbackServerContext;
using grpc::Channel;
using grpc::ClientContext;
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerUnaryReactor;
using grpc::Status;
using helloworld::Greeter;
using helloworld::HelloReply;
using helloworld::HelloRequest;

void AddLatencyView(opentelemetry::sdk::metrics::MeterProvider* provider,
                    const std::string& name, const std::string& unit) {
  auto histogram_config = std::make_shared<
      opentelemetry::sdk::metrics::HistogramAggregationConfig>();
  histogram_config->boundaries_ = {
      0,     0.00001, 0.00005, 0.0001, 0.0003, 0.0006, 0.0008, 0.001, 0.002,
      0.003, 0.004,   0.005,   0.006,  0.008,  0.01,   0.013,  0.016, 0.02,
      0.025, 0.03,    0.04,    0.05,   0.065,  0.08,   0.1,    0.13,  0.16,
      0.2,   0.25,    0.3,     0.4,    0.5,    0.65,   0.8,    1,     2,
      5,     10,      20,      50,     100};
  provider->AddView(
      opentelemetry::sdk::metrics::InstrumentSelectorFactory::Create(
          opentelemetry::sdk::metrics::InstrumentType::kHistogram, name, unit),
      opentelemetry::sdk::metrics::MeterSelectorFactory::Create(
          "grpc-c++", grpc::Version(), ""),
      opentelemetry::sdk::metrics::ViewFactory::Create(
          name, "", unit,
          opentelemetry::sdk::metrics::AggregationType::kHistogram,
          std::move(histogram_config)));
}