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Otlp http log example (#1062)
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‎examples/common/CMakeLists.txt‎

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add_subdirectory(foo_library)
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if(WITH_LOGS_PREVIEW)
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add_subdirectory(logs_foo_library)
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endif()

‎examples/common/logs_foo_library/BUILD‎

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package(default_visibility = ["//visibility:public"])
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cc_library(
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name = "common_logs_foo_library",
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srcs = [
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"foo_library.cc",
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],
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hdrs = [
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"foo_library.h",
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],
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defines = ["BAZEL_BUILD"],
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deps = [
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"//api",
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"//sdk:headers",
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],
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)

‎examples/common/logs_foo_library/CMakeLists.txt‎

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add_library(common_logs_foo_library foo_library.h foo_library.cc)
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target_link_libraries(common_logs_foo_library PUBLIC ${CMAKE_THREAD_LIBS_INIT}
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opentelemetry_api)

‎examples/common/logs_foo_library/foo_library.cc‎

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// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#ifdef ENABLE_LOGS_PREVIEW
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# include <map>
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# include <string>
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# include "opentelemetry/logs/provider.h"
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# include "opentelemetry/sdk/version/version.h"
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# include "opentelemetry/trace/provider.h"
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namespace logs = opentelemetry::logs;
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namespace trace = opentelemetry::trace;
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namespace nostd = opentelemetry::nostd;
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namespace
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{
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nostd::shared_ptr<trace::Tracer> get_tracer()
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{
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auto provider = trace::Provider::GetTracerProvider();
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return provider->GetTracer("foo_library", OPENTELEMETRY_SDK_VERSION);
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}
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nostd::shared_ptr<logs::Logger> get_logger()
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{
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auto provider = logs::Provider::GetLoggerProvider();
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return provider->GetLogger("foo_library_logger");
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}
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} // namespace
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void foo_library()
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{
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auto span = get_tracer()->StartSpan("span 1");
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auto scoped_span = trace::Scope(get_tracer()->StartSpan("foo_library"));
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auto ctx = span->GetContext();
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auto logger = get_logger();
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logger->Log(opentelemetry::logs::Severity::kDebug, "name", "body", {}, {}, ctx.trace_id(),
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ctx.span_id(), ctx.trace_flags(), opentelemetry::common::SystemTimestamp());
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}
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#endif

‎examples/common/logs_foo_library/foo_library.h‎

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// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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void foo_library();

‎examples/otlp/BUILD‎

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"//sdk/src/trace",
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],
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)
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cc_binary(
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name = "example_otlp_http_log",
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srcs = [
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"http_log_main.cc",
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],
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deps = [
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"//api",
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"//examples/common/logs_foo_library:common_logs_foo_library",
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"//exporters/otlp:otlp_http_exporter",
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"//exporters/otlp:otlp_http_log_exporter",
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"//sdk/src/trace",
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],
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)

‎examples/otlp/CMakeLists.txt‎

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target_link_libraries(
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example_otlp_http ${CMAKE_THREAD_LIBS_INIT} common_foo_library
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opentelemetry_trace opentelemetry_exporter_otlp_http)
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if(WITH_LOGS_PREVIEW)
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add_executable(example_otlp_http_log http_log_main.cc)
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target_link_libraries(
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example_otlp_http_log
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${CMAKE_THREAD_LIBS_INIT}
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common_logs_foo_library
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opentelemetry_trace
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opentelemetry_logs
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opentelemetry_exporter_otlp_http
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opentelemetry_exporter_otlp_http_log)
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endif()
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endif()

‎examples/otlp/README.md‎

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@@ -4,8 +4,9 @@ This is an example of how to use the [OpenTelemetry
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Protocol](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/README.md)
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(OTLP) exporter.
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The application in `grpc_main.cc` initializes an `OtlpGrpcExporter` instance and
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the application in `http_main.cc` initializes an `OtlpHttpExporter` instance
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The application in `grpc_main.cc` initializes an `OtlpGrpcExporter` instance,
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the application in `http_main.cc` initializes an `OtlpHttpExporter` instance.
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The application in `http_log_main.cc` initializes an `OtlpHttpLogExporter` instance
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and they register a tracer provider from the [OpenTelemetry
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SDK](https://github.com/open-telemetry/opentelemetry-cpp). The application then
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calls a `foo_library` which has been instrumented using the [OpenTelemetry

‎examples/otlp/http_log_main.cc‎

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// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#ifdef ENABLE_LOGS_PREVIEW
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# include "opentelemetry/exporters/otlp/otlp_http_exporter.h"
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# include "opentelemetry/exporters/otlp/otlp_http_log_exporter.h"
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# include "opentelemetry/logs/provider.h"
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# include "opentelemetry/sdk/logs/logger_provider.h"
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# include "opentelemetry/sdk/logs/simple_log_processor.h"
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# include "opentelemetry/sdk/trace/simple_processor.h"
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# include "opentelemetry/sdk/trace/tracer_provider.h"
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# include "opentelemetry/trace/provider.h"
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# include <string>
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# ifdef BAZEL_BUILD
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# include "examples/common/logs_foo_library/foo_library.h"
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# else
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# include "logs_foo_library/foo_library.h"
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# endif
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namespace trace = opentelemetry::trace;
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namespace nostd = opentelemetry::nostd;
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namespace otlp = opentelemetry::exporter::otlp;
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namespace logs_sdk = opentelemetry::sdk::logs;
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namespace logs = opentelemetry::logs;
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namespace trace_sdk = opentelemetry::sdk::trace;
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namespace
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{
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opentelemetry::exporter::otlp::OtlpHttpExporterOptions opts;
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void InitTracer()
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{
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// Create OTLP exporter instance
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auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(new otlp::OtlpHttpExporter(opts));
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auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
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new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
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auto provider =
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nostd::shared_ptr<trace::TracerProvider>(new trace_sdk::TracerProvider(std::move(processor)));
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// Set the global trace provider
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trace::Provider::SetTracerProvider(provider);
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}
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opentelemetry::exporter::otlp::OtlpHttpLogExporterOptions logger_opts;
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void InitLogger()
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{
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logger_opts.console_debug = true;
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// Create OTLP exporter instance
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auto exporter =
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std::unique_ptr<logs_sdk::LogExporter>(new otlp::OtlpHttpLogExporter(logger_opts));
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auto processor = std::shared_ptr<logs_sdk::LogProcessor>(
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new logs_sdk::SimpleLogProcessor(std::move(exporter)));
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auto sdkProvider = std::shared_ptr<logs_sdk::LoggerProvider>(new logs_sdk::LoggerProvider());
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sdkProvider->SetProcessor(processor);
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auto apiProvider = nostd::shared_ptr<logs::LoggerProvider>(sdkProvider);
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auto provider = nostd::shared_ptr<logs::LoggerProvider>(apiProvider);
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opentelemetry::logs::Provider::SetLoggerProvider(provider);
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}
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} // namespace
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int main(int argc, char *argv[])
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{
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if (argc > 1)
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{
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opts.url = argv[1];
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logger_opts.url = argv[1];
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if (argc > 2)
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{
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std::string debug = argv[2];
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opts.console_debug = debug != "" && debug != "0" && debug != "no";
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}
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if (argc > 3)
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{
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std::string binary_mode = argv[3];
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if (binary_mode.size() >= 3 && binary_mode.substr(0, 3) == "bin")
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{
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opts.content_type = opentelemetry::exporter::otlp::HttpRequestContentType::kBinary;
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logger_opts.content_type = opentelemetry::exporter::otlp::HttpRequestContentType::kBinary;
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}
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}
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}
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InitLogger();
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InitTracer();
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foo_library();
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}
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#else
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int main()
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{
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return 0;
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}
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#endif

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