Rastrear um aplicativo C++

Saiba como compilar e executar o exemplo em C++ com o OpenTelemetry e exportar os rastreamentos para o Cloud Trace. Este exemplo usa o cliente C++ do Google Cloud Pub/Sub para publicar cinco mensagens e exporta os rastreamentos para o Cloud Trace.

Antes de começar

  1. Faça login na sua conta do Google Cloud . Se você começou a usar o Google Cloud, crie uma conta para avaliar o desempenho de nossos produtos em situações reais. Clientes novos também recebem US$ 300 em créditos para executar, testar e implantar cargas de trabalho.

  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. Instale a CLI do Google Cloud.

  6. Ao usar um provedor de identidade (IdP) externo, primeiro faça login na gcloud CLI com sua identidade federada.

  7. Para inicializar a gcloud CLI, execute o seguinte 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. Instale a CLI do Google Cloud.

  12. Ao usar um provedor de identidade (IdP) externo, primeiro faça login na gcloud CLI com sua identidade federada.

  13. Para inicializar a gcloud CLI, execute o seguinte comando: 

    gcloud init

Configurar

  1. Crie um tópico com o ID my-topic:

    gcloud pubsub topics create my-topic

  2. Confira o exemplo de código-fonte em C++:

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

Publique mensagens

// 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. Compile e execute o exemplo:

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

  2. Depois de executar este exemplo, as seguintes linhas serão impressas no 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)

Ver traces

No console Google Cloud , acesse a página Explorador de traces:

Acessar o Explorador de traces

Também é possível encontrar essa página usando a barra de pesquisa.

Limpar

Para evitar cobranças na conta do Google Cloud pelos recursos usados nesta página, siga as etapas abaixo.

  1. Exclua o tópico criado pelo exemplo:

    gcloud pubsub topics delete my-topic

A seguir