1 /*
2 *
3 * Copyright 2021 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 // Explicitly define HAVE_ABSEIL to avoid conflict with OTel's Abseil
20 // version. Refer
21 // https://github.com/open-telemetry/opentelemetry-cpp/issues/1042.
22 #ifndef HAVE_ABSEIL
23 #define HAVE_ABSEIL
24 #endif
25
26 #include <iostream>
27 #include <memory>
28 #include <string>
29
30 #include "absl/flags/flag.h"
31 #include "absl/flags/parse.h"
32 #include "opentelemetry/exporters/ostream/metric_exporter.h"
33 #include "opentelemetry/exporters/ostream/metric_exporter_factory.h"
34 #include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader.h"
35 #include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_factory.h"
36 #include "opentelemetry/sdk/metrics/meter_provider.h"
37
38 #include <grpcpp/ext/otel_plugin.h>
39
40 #ifdef BAZEL_BUILD
41 #include "examples/cpp/otel/util.h"
42 #else
43 #include "../util.h"
44 #endif
45
46 ABSL_FLAG(uint16_t, port, 50051, "Server port for the service");
47
main(int argc,char ** argv)48 int main(int argc, char** argv) {
49 absl::ParseCommandLine(argc, argv);
50 // Register a global gRPC OpenTelemetry plugin configured with an ostream
51 // exporter.
52 auto ostream_exporter =
53 opentelemetry::exporter::metrics::OStreamMetricExporterFactory::Create();
54 opentelemetry::sdk::metrics::PeriodicExportingMetricReaderOptions
55 reader_options;
56 reader_options.export_interval_millis = std::chrono::milliseconds(1000);
57 reader_options.export_timeout_millis = std::chrono::milliseconds(500);
58 auto reader =
59 opentelemetry::sdk::metrics::PeriodicExportingMetricReaderFactory::Create(
60 std::move(ostream_exporter), reader_options);
61 auto meter_provider =
62 std::make_shared<opentelemetry::sdk::metrics::MeterProvider>();
63 // The default histogram boundaries are not granular enough for RPCs. Override
64 // the "grpc.server.call.duration" view as recommended by
65 // https://github.com/grpc/proposal/blob/master/A66-otel-stats.md.
66 AddLatencyView(meter_provider.get(), "grpc.server.call.duration", "s");
67 meter_provider->AddMetricReader(std::move(reader));
68 auto status = grpc::OpenTelemetryPluginBuilder()
69 .SetMeterProvider(std::move(meter_provider))
70 .BuildAndRegisterGlobal();
71 if (!status.ok()) {
72 std::cerr << "Failed to register gRPC OpenTelemetry Plugin: "
73 << status.ToString() << std::endl;
74 return static_cast<int>(status.code());
75 }
76 RunServer(absl::GetFlag(FLAGS_port));
77 return 0;
78 }
79