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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 service as member functions of the class. This library groups multiple 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.
Except 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 is used to send application trace data to Cloud Trace."],["The latest version available is 2.37.0-rc, while a range of prior versions, from 2.36.0 down to 2.11.0, are also listed with links to their specific documentation."],["The library includes `*Client` classes such as `trace_v1::TraceServiceClient` and `trace_v2::TraceServiceClient`, which offer all Remote Procedure Calls (RPCs) for a service as member functions."],["The library does not follow Semantic Versioning, but the library is in GA (generally available) status."],["The documentation outlines how to handle errors, override the default endpoint and authentication credentials, change retry policies, and use environment variables to configure the library."]]],[]]
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