Trace, un'applicazione C++

Scopri come compilare ed eseguire l'esempio C++ con OpenTelemetry ed esportare le tracce in Cloud Trace Questo esempio utilizza il client C++ di Google Cloud Pub/Sub per pubblicare 5 messaggi ed esporta le tracce in Cloud Trace.

Prima di iniziare

  1. Accedi al tuo Google Cloud account. Se non conosci Google Cloud, crea un account per valutare le prestazioni dei nostri prodotti in scenari reali. I nuovi clienti ricevono anche 300 $di crediti senza costi per l'esecuzione, il test e il deployment dei workload.

  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. Verify that billing is enabled for your Google Cloud project.

  4. Enable the Pub/Sub and Trace APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  5. Installa Google Cloud CLI.

  6. Se utilizzi un provider di identità (IdP) esterno, devi prima accedere a gcloud CLI con la tua identità federata.

  7. Per inizializzare gcloud CLI, esegui questo comando: 

    gcloud init

  8. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  9. Verify that billing is enabled for your Google Cloud project.

  10. Enable the Pub/Sub and Trace APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  11. Installa Google Cloud CLI.

  12. Se utilizzi un provider di identità (IdP) esterno, devi prima accedere a gcloud CLI con la tua identità federata.

  13. Per inizializzare gcloud CLI, esegui questo comando: 

    gcloud init

Configura

  1. Crea un argomento con l'ID my-topic:

    gcloud pubsub topics create my-topic

  2. Estrai il codice sorgente di esempio C++:

    git clone --depth 1 https://github.com/GoogleCloudPlatforms/cpp-samples

pubblica dei messaggi

// Create a few namespace aliases to make the code easier to read.
namespace gc = ::google::cloud;
namespace otel = gc::otel;
namespace pubsub = gc::pubsub;

// This example uses a simple wrapper to export (upload) OTel tracing data
// to Google Cloud Trace. More complex applications may use different
// authentication, or configure their own OTel exporter.
auto project = gc::Project(project_id);
auto configuration = otel::ConfigureBasicTracing(project);

auto publisher = pubsub::Publisher(pubsub::MakePublisherConnection(
    pubsub::Topic(project_id, topic_id),
    // Configure this publisher to enable OTel tracing. Some applications may
    // chose to disable tracing in some publishers or to dynamically enable
    // this option based on their own configuration.
    gc::Options{}.set<gc::OpenTelemetryTracingOption>(true)));

// After this point, use the Cloud Pub/Sub C++ client library as usual.
// In this example, we will send a few messages and configure a callback
// action for each one.
std::vector<gc::future<void>> ids;
for (int i = 0; i < 5; i++) {
  auto id = publisher.Publish(pubsub::MessageBuilder().SetData("Hi!").Build())
                .then([](gc::future<gc::StatusOr<std::string>> f) {
                  auto id = f.get();
                  if (!id) {
                    std::cout << "Error in publish: " << id.status() << "\n";
                    return;
                  }
                  std::cout << "Sent message with id: (" << *id << ")\n";
                });
  ids.push_back(std::move(id));
}
// Block until the messages are actually sent.
for (auto& id : ids) id.get();

  1. Compila ed esegui l'esempio:

    cd cpp-samples/pubsub-open-telemetry
bazel run //:quickstart -- $(gcloud config get project) my-topic

  2. Dopo aver eseguito questo esempio, vedrai le seguenti righe stampate nella console.

    Sent message with id: (9095112996778043)
Sent message with id: (9095112996778044)
Sent message with id: (9095112996778045)
Sent message with id: (9095112996778046)
Sent message with id: (9095112996778047)

Visualizza tracce

Nella Google Cloud console, vai alla Esplora tracce pagina:

Vai a Esplora tracce

Puoi trovare questa pagina anche utilizzando la barra di ricerca.

Libera spazio

Per evitare che al tuo Google Cloud account vengano addebitati costi relativi alle risorse utilizzate in questa pagina, segui questi passaggi.

  1. Elimina l'argomento creato dall'esempio:

    gcloud pubsub topics delete my-topic

Passaggi successivi