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An idiomatic C++ client library for the Cloud Trace API, a service to send application trace data to Cloud Trace for viewing. This library is used to interact with the Trace API directly. If you are looking to instrument your application for Cloud Trace, we recommend using OpenTelemetry or a similar framework.
While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.
QuickstartThe following shows the code that you'll run in the google/cloud/trace/quickstart/ directory, which should give you a taste of the Cloud Trace API C++ client library API.
#include "google/cloud/trace/v2/trace_client.h"
#include "google/cloud/project.h"
#include <google/protobuf/util/time_util.h>
#include <iostream>
#include <random>
#include <thread>
std::string RandomHexDigits(std::mt19937_64& gen, int count) {
auto const digits = std::string{"0123456789abcdef"};
std::string sample;
std::generate_n(std::back_inserter(sample), count, [&] {
auto n = digits.size() - 1;
return digits[std::uniform_int_distribution<std::size_t>(0, n)(gen)];
});
return sample;
}
int main(int argc, char* argv[]) try {
if (argc != 2) {
std::cerr << "Usage: " << argv[0] << " project-id\n";
return 1;
}
namespace trace = ::google::cloud::trace_v2;
namespace v2 = ::google::devtools::cloudtrace::v2;
using ::google::protobuf::util::TimeUtil;
auto client = trace::TraceServiceClient(trace::MakeTraceServiceConnection());
// Create a span ID using some random hex digits.
auto gen = std::mt19937_64(std::random_device{}());
v2::Span span;
auto span_id = RandomHexDigits(gen, 16);
span.set_name(std::string{"projects/"} + argv[1] + "/traces/" +
RandomHexDigits(gen, 32) + "/spans/" + span_id);
span.set_span_id(std::move(span_id));
*span.mutable_start_time() = (TimeUtil::GetCurrentTime)();
// Simulate a call using a small sleep
std::this_thread::sleep_for(std::chrono::milliseconds(2));
*span.mutable_end_time() = (TimeUtil::GetCurrentTime)();
auto response = client.CreateSpan(span);
if (!response) throw std::move(response).status();
std::cout << response->DebugString() << "\n";
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a gRPC service as member functions of the class. This library groups multiple gRPC services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.
The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.
The library automatically retries requests that fail with transient errors, and uses exponential backoff to backoff between retries. Application developers can override the default policies.
More InformationExcept as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This webpage provides documentation for the Cloud Trace API C++ client library, which allows developers to send application trace data to Cloud Trace."],["The latest version of the documentation is for the 2.37.0-rc release, with historical versions available dating back to version 2.11.0."],["The library includes `TraceServiceClient` classes for both v1 and v2 of the Trace API, offering methods that correspond to gRPC services for interacting with the Cloud Trace API."],["The library handles transient errors with automatic retries and exponential backoff, and users can override default policies, endpoint, or authentication credentials as needed."],["For instrumenting applications, the documentation recommends utilizing OpenTelemetry or a similar framework, with this library primarily designed for direct interaction with the Trace API."]]],[]]
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