Esegui un workflow utilizzando le librerie client di Cloud

Questa guida rapida mostra come eseguire un workflow e visualizzare i risultati dell'esecuzione utilizzando le librerie client Cloud.

Per saperne di più sull'installazione delle librerie client Cloud e sulla configurazione dell'ambiente di sviluppo, consulta la panoramica delle librerie client Workflows.

Puoi completare i seguenti passaggi utilizzando Google Cloud CLI nel terminale o in Cloud Shell.

Prima di iniziare

I vincoli di sicurezza definiti dalla tua organizzazione potrebbero impedirti di completare i passaggi seguenti. Per informazioni sulla risoluzione dei problemi, vedi Sviluppare applicazioni in un ambiente Google Cloud vincolato.

  1. Accedi al tuo account Google Cloud . 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. Installa Google Cloud CLI.

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

  4. Per inizializzare gcloud CLI, esegui questo comando: 

    gcloud init

  5. Crea o seleziona un Google Cloud progetto.

    Ruoli richiesti per selezionare o creare un progetto

    • Seleziona un progetto: la selezione di un progetto non richiede un ruolo IAM specifico. Puoi selezionare qualsiasi progetto per il quale ti è stato concesso un ruolo.
    • Crea un progetto: per creare un progetto, devi disporre del ruolo Autore progetto (roles/resourcemanager.projectCreator), che contiene l'autorizzazione resourcemanager.projects.create. Scopri come concedere i ruoli.

    • Creare un progetto Google Cloud :

      gcloud projects create PROJECT_ID

      Sostituisci PROJECT_ID con un nome per il progetto Google Cloud che stai creando.

    • Seleziona il progetto Google Cloud che hai creato:

      gcloud config set project PROJECT_ID

      Sostituisci PROJECT_ID con il nome del progetto Google Cloud .

  6. Se utilizzi un progetto esistente per questa guida, verifica di disporre delle autorizzazioni necessarie per completare la guida. Se hai creato un nuovo progetto, disponi già delle autorizzazioni necessarie.

  7. Verifica che la fatturazione sia abilitata per il tuo progetto Google Cloud .

  8. Abilita l'API Workflows:

    Ruoli richiesti per abilitare le API

    Per abilitare le API, devi disporre del ruolo IAM Amministratore utilizzo dei servizi (roles/serviceusage.serviceUsageAdmin), che include l'autorizzazione serviceusage.services.enable. Scopri come concedere i ruoli. 

    gcloud services enable workflows.googleapis.com

  9. Installa Google Cloud CLI.

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

  11. Per inizializzare gcloud CLI, esegui questo comando: 

    gcloud init

  12. Crea o seleziona un Google Cloud progetto.

    Ruoli richiesti per selezionare o creare un progetto

    • Seleziona un progetto: la selezione di un progetto non richiede un ruolo IAM specifico. Puoi selezionare qualsiasi progetto per il quale ti è stato concesso un ruolo.
    • Crea un progetto: per creare un progetto, devi disporre del ruolo Autore progetto (roles/resourcemanager.projectCreator), che contiene l'autorizzazione resourcemanager.projects.create. Scopri come concedere i ruoli.

    • Creare un progetto Google Cloud :

      gcloud projects create PROJECT_ID

      Sostituisci PROJECT_ID con un nome per il progetto Google Cloud che stai creando.

    • Seleziona il progetto Google Cloud che hai creato:

      gcloud config set project PROJECT_ID

      Sostituisci PROJECT_ID con il nome del progetto Google Cloud .

  13. Se utilizzi un progetto esistente per questa guida, verifica di disporre delle autorizzazioni necessarie per completare la guida. Se hai creato un nuovo progetto, disponi già delle autorizzazioni necessarie.

  14. Verifica che la fatturazione sia abilitata per il tuo progetto Google Cloud .

  15. Abilita l'API Workflows:

    Ruoli richiesti per abilitare le API

    Per abilitare le API, devi disporre del ruolo IAM Amministratore utilizzo dei servizi (roles/serviceusage.serviceUsageAdmin), che include l'autorizzazione serviceusage.services.enable. Scopri come concedere i ruoli. 

    gcloud services enable workflows.googleapis.com
    16.

  16. Configura l'autenticazione:

    1. Assicurati di disporre del ruolo IAM Creazione account di servizio (roles/iam.serviceAccountCreator) e del ruolo Amministratore IAM progetto (roles/resourcemanager.projectIamAdmin). Scopri come concedere i ruoli.

    2. Crea l'account di servizio: 

      gcloud iam service-accounts create SERVICE_ACCOUNT_NAME

      Sostituisci SERVICE_ACCOUNT_NAME con un nome per il account di servizio.

    3. Concedi il ruolo IAM roles/logging.logWriter al account di servizio: 

      gcloud projects add-iam-policy-binding PROJECT_ID --member="serviceAccount:SERVICE_ACCOUNT_NAME@PROJECT_ID.iam.gserviceaccount.com" --role=roles/logging.logWriter

      Sostituisci quanto segue:

      • SERVICE_ACCOUNT_NAME: il nome del account di servizio
      • PROJECT_ID: l'ID progetto in cui hai creato il account di servizio

    17. Per scoprire di più sui ruoli e sulle autorizzazioni dei account di servizio, consulta Concedi l'autorizzazione dei workflow per l'accesso alle Google Cloud risorse.

  17. Se necessario, scarica e installa lo strumento di gestione del codice sorgente Git.

Ruoli obbligatori

Per ottenere le autorizzazioni necessarie per completare questa guida rapida, chiedi all'amministratore di concederti i seguenti ruoli IAM nel tuo progetto:

Per saperne di più sulla concessione dei ruoli, consulta Gestisci l'accesso a progetti, cartelle e organizzazioni.

Potresti anche riuscire a ottenere le autorizzazioni richieste tramite i ruoli personalizzati o altri ruoli predefiniti.

Esegui il deployment di un flusso di lavoro di esempio

Dopo aver definito un workflow, esegui il deployment per renderlo disponibile per l'esecuzione. Il passaggio di deployment verifica anche che il file di origine possa essere eseguito.

Il seguente workflow invia una richiesta a un'API pubblica e poi restituisce la risposta dell'API.

  1. Crea un file di testo con il nome file myFirstWorkflow.yaml con il seguente contenuto:

    # This workflow accepts an optional "searchTerm" argument for the Wikipedia API.
# If no input arguments are provided or "searchTerm" is absent,
# it will fetch the day of the week in Amsterdam and use it as the search term.

main:
    params: [input]
    steps:
    - validateSearchTermAndRedirectToReadWikipedia:
        switch:
            - condition: '${map.get(input, "searchTerm") != null}'
              assign:
                - searchTerm: '${input.searchTerm}'
              next: readWikipedia
    - getCurrentTime:
        call: http.get
        args:
            url: https://timeapi.io/api/Time/current/zone?timeZone=Europe/Amsterdam
        result: currentTime
    - setFromCallResult:
        assign:
            - searchTerm: '${currentTime.body.dayOfWeek}'
    - readWikipedia:
        call: http.get
        args:
            url: 'https://en.wikipedia.org/w/api.php'
            query:
                action: opensearch
                search: '${searchTerm}'
        result: wikiResult
    - returnOutput:
            return: '${wikiResult.body[1]}'

  2. Dopo aver creato il workflow, puoi eseguirne il deployment, ma non eseguirlo:

    gcloud workflows deploy myFirstWorkflow \
    --source=myFirstWorkflow.yaml \
    --service-account=SERVICE_ACCOUNT_NAME@PROJECT_ID.iam.gserviceaccount.com \
    --location=CLOUD_REGION

    Sostituisci CLOUD_REGION con una posizione supportata per il workflow. La regione predefinita utilizzata negli esempi di codice è us-central1.

recupera il codice campione

Puoi clonare il codice campione da GitHub.

  1. Clona il repository dell'app di esempio sulla tua macchina locale:

    C# 

    git clone https://github.com/GoogleCloudPlatform/dotnet-docs-samples.git

    In alternativa puoi scaricare l'esempio come file ZIP ed estrarlo.

    Go 

    git clone https://github.com/GoogleCloudPlatform/golang-samples.git

    In alternativa puoi scaricare l'esempio come file ZIP ed estrarlo.

    Java 

    git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git

    In alternativa puoi scaricare l'esempio come file ZIP ed estrarlo.

    Node.js 

    git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git

    In alternativa puoi scaricare l'esempio come file ZIP ed estrarlo.

    Python 

    git clone https://github.com/GoogleCloudPlatform/python-docs-samples.git

    In alternativa puoi scaricare l'esempio come file ZIP ed estrarlo.

  2. Passa alla directory che contiene il codice campione di Workflows:

    C# 

    cd dotnet-docs-samples/workflows/api/Workflow.Samples/

    Go 

    cd golang-samples/workflows/executions/

    Java 

    cd java-docs-samples/workflows/cloud-client/

    Node.js 

    cd nodejs-docs-samples/workflows/quickstart/

    Python 

    cd python-docs-samples/workflows/cloud-client/

  3. Dai un'occhiata al codice campione. Ogni app di esempio esegue le seguenti operazioni:

    1. Configura le librerie client Cloud per Workflows.
    2. Esegue un workflow.
    3. Esegue il polling dell'esecuzione del flusso di lavoro (utilizzando il backoff esponenziale) finché non termina.
    4. Stampa i risultati dell'esecuzione.

    C# 

    
using Google.Cloud.Workflows.Common.V1;
using Google.Cloud.Workflows.Executions.V1;
using System;
using System.Threading;
using System.Threading.Tasks;

public class ExecuteWorkflowSample
{
    /// <summary>
    /// Execute a workflow and return the execution operation.
    /// </summary>
    /// <param name="projectID">Your Google Cloud Project ID.</param>
    /// <param name="locationID">The region where your workflow is located.</param>
    /// <param name="workflowID">Your Workflow ID.</param>
    /// <returns>
    /// An Execute object representing the completed workflow execution.
    /// </returns>
    public async Task<Execution> ExecuteWorkflow(
        string projectId = "YOUR-PROJECT-ID",
        string locationID = "YOUR-LOCATION-ID",
        string workflowID = "YOUR-WORKFLOW-ID")
    {
        // Initialize the client.
        ExecutionsClient client = await ExecutionsClient.CreateAsync();

        // Build the parent location path.
        WorkflowName parent = new WorkflowName(projectId, locationID, workflowID);

        // Create an execution request.
        CreateExecutionRequest createExecutionRequest = new CreateExecutionRequest
        {
            ParentAsWorkflowName = parent,
        };

        // Execute the operation.
        Execution execution = await client.CreateExecutionAsync(createExecutionRequest);
        Console.WriteLine("- Execution started...");

        TimeSpan backoffDelay = TimeSpan.FromSeconds(1);
        TimeSpan maxBackoffDelay = TimeSpan.FromSeconds(16);

        // Keep polling the state until the execution finishes, using exponential backoff.
        while (execution.State == Execution.Types.State.Active)
        {
            await Task.Delay(backoffDelay);

            // Implement exponential backoff by doubling the delay, but limiting it to a practical duration.
            backoffDelay = (backoffDelay < maxBackoffDelay) ? backoffDelay * 2 : maxBackoffDelay;

            execution = await client.GetExecutionAsync(execution.Name);
        }

        // Print results.
        Console.WriteLine($"Execution finished with state: {execution.State}");
        Console.WriteLine($"Execution results: {execution.Result}");

        // Return the fetched execution.
        return execution;
    }
}

    Go 

    import (
	"context"
	"fmt"
	"io"
	"time"

	workflowexecutions "google.golang.org/api/workflowexecutions/v1"
)

// Execute a workflow and print the execution results.
//
// For more information about Workflows see:
// https://cloud.google.com/workflows/docs/overview
func executeWorkflow(w io.Writer, projectID, workflowID, locationID string) error {
	// TODO(developer): Uncomment and update the following lines:
	// projectID := "YOUR_PROJECT_ID"
	// workflowID := "YOUR_WORKFLOW_ID"
	// locationID := "YOUR_LOCATION_ID"

	ctx := context.Background()

	// Construct the location path.
	parent := fmt.Sprintf("projects/%s/locations/%s/workflows/%s", projectID, locationID, workflowID)

	// Create execution client.
	client, err := workflowexecutions.NewService(ctx)
	if err != nil {
		return fmt.Errorf("workflowexecutions.NewService error: %w", err)
	}

	// Get execution service.
	service := client.Projects.Locations.Workflows.Executions

	// Build and run the new workflow execution.
	res, err := service.Create(parent, &workflowexecutions.Execution{}).Do()
	if err != nil {
		return fmt.Errorf("service.Create.Do error: %w", err)
	}
	fmt.Fprintln(w, "- Execution started...")

	// Set initial value for backoff delay in one second.
	backoffDelay := time.Second

	for res.State == "ACTIVE" {
		time.Sleep(backoffDelay)

		// Request the updated state for the execution.
		getReq := service.Get(res.Name)
		res, err = getReq.Do()
		if err != nil {
			return fmt.Errorf("getReq error: %w", err)
		}

		// Double the delay to provide exponential backoff (capped at 16 seconds).
		if backoffDelay < time.Second*16 {
			backoffDelay *= 2
		}
	}

	fmt.Fprintf(w, "Execution finished with state: %s\n", res.State)
	fmt.Fprintf(w, "Execution results: %s\n", res.Result)

	return nil
}

    Java 

    // Imports the Google Cloud client library

import com.google.cloud.workflows.executions.v1.CreateExecutionRequest;
import com.google.cloud.workflows.executions.v1.Execution;
import com.google.cloud.workflows.executions.v1.ExecutionsClient;
import com.google.cloud.workflows.executions.v1.WorkflowName;
import java.io.IOException;
import java.util.concurrent.ExecutionException;

public class WorkflowsQuickstart {

  private static final String PROJECT = System.getenv("GOOGLE_CLOUD_PROJECT");
  private static final String LOCATION = System.getenv().getOrDefault("LOCATION", "us-central1");
  private static final String WORKFLOW =
      System.getenv().getOrDefault("WORKFLOW", "myFirstWorkflow");

  public static void main(String... args)
      throws IOException, InterruptedException, ExecutionException {
    if (PROJECT == null) {
      throw new IllegalArgumentException(
          "Environment variable 'GOOGLE_CLOUD_PROJECT' is required to run this quickstart.");
    }
    workflowsQuickstart(PROJECT, LOCATION, WORKFLOW);
  }

  private static volatile boolean finished;

  public static void workflowsQuickstart(String projectId, String location, String workflow)
      throws IOException, InterruptedException, ExecutionException {
    // Initialize client that will be used to send requests. This client only needs
    // to be created once, and can be reused for multiple requests. After completing all of your
    // requests, call the "close" method on the client to safely clean up any remaining background
    // resources.
    try (ExecutionsClient executionsClient = ExecutionsClient.create()) {
      // Construct the fully qualified location path.
      WorkflowName parent = WorkflowName.of(projectId, location, workflow);

      // Creates the execution object.
      CreateExecutionRequest request =
          CreateExecutionRequest.newBuilder()
              .setParent(parent.toString())
              .setExecution(Execution.newBuilder().build())
              .build();
      Execution response = executionsClient.createExecution(request);

      String executionName = response.getName();
      System.out.printf("Created execution: %s%n", executionName);

      long backoffTime = 0;
      long backoffDelay = 1_000; // Start wait with delay of 1,000 ms
      final long backoffTimeout = 10 * 60 * 1_000; // Time out at 10 minutes
      System.out.println("Poll for results...");

      // Wait for execution to finish, then print results.
      while (!finished && backoffTime < backoffTimeout) {
        Execution execution = executionsClient.getExecution(executionName);
        finished = execution.getState() != Execution.State.ACTIVE;

        // If we haven't seen the results yet, wait.
        if (!finished) {
          System.out.println("- Waiting for results");
          Thread.sleep(backoffDelay);
          backoffTime += backoffDelay;
          backoffDelay *= 2; // Double the delay to provide exponential backoff.
        } else {
          System.out.println("Execution finished with state: " + execution.getState().name());
          System.out.println("Execution results: " + execution.getResult());
        }
      }
    }
  }
}

    Node.js 

    const {ExecutionsClient} = require('@google-cloud/workflows');
const client = new ExecutionsClient();
/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const projectId = 'my-project';
// const location = 'us-central1';
// const workflow = 'myFirstWorkflow';
// const searchTerm = '';

/**
 * Executes a Workflow and waits for the results with exponential backoff.
 * @param {string} projectId The Google Cloud Project containing the workflow
 * @param {string} location The workflow location
 * @param {string} workflow The workflow name
 * @param {string} searchTerm Optional search term to pass to the Workflow as a runtime argument
 */
async function executeWorkflow(projectId, location, workflow, searchTerm) {
  /**
   * Sleeps the process N number of milliseconds.
   * @param {Number} ms The number of milliseconds to sleep.
   */
  function sleep(ms) {
    return new Promise(resolve => {
      setTimeout(resolve, ms);
    });
  }
  const runtimeArgs = searchTerm ? {searchTerm: searchTerm} : {};
  // Execute workflow
  try {
    const createExecutionRes = await client.createExecution({
      parent: client.workflowPath(projectId, location, workflow),
      execution: {
        // Runtime arguments can be passed as a JSON string
        argument: JSON.stringify(runtimeArgs),
      },
    });
    const executionName = createExecutionRes[0].name;
    console.log(`Created execution: ${executionName}`);

    // Wait for execution to finish, then print results.
    let executionFinished = false;
    let backoffDelay = 1000; // Start wait with delay of 1,000 ms
    console.log('Poll every second for result...');
    while (!executionFinished) {
      const [execution] = await client.getExecution({
        name: executionName,
      });
      executionFinished = execution.state !== 'ACTIVE';

      // If we haven't seen the result yet, wait a second.
      if (!executionFinished) {
        console.log('- Waiting for results...');
        await sleep(backoffDelay);
        backoffDelay *= 2; // Double the delay to provide exponential backoff.
      } else {
        console.log(`Execution finished with state: ${execution.state}`);
        console.log(execution.result);
        return execution.result;
      }
    }
  } catch (e) {
    console.error(`Error executing workflow: ${e}`);
  }
}

executeWorkflow(projectId, location, workflowName, searchTerm).catch(err => {
  console.error(err.message);
  process.exitCode = 1;
});

    Python 

    import time

from google.cloud import workflows_v1
from google.cloud.workflows import executions_v1

from google.cloud.workflows.executions_v1.types import executions

# TODO(developer): Update and uncomment the following lines.
# project_id = "YOUR_PROJECT_ID"
# location = "YOUR_LOCATION"  # For example: us-central1
# workflow_id = "YOUR_WORKFLOW_ID"  # For example: myFirstWorkflow

# Initialize API clients.
execution_client = executions_v1.ExecutionsClient()
workflows_client = workflows_v1.WorkflowsClient()

# Construct the fully qualified location path.
parent = workflows_client.workflow_path(project_id, location, workflow_id)

# Execute the workflow.
response = execution_client.create_execution(request={"parent": parent})
print(f"Created execution: {response.name}")

# Wait for execution to finish, then print results.
execution_finished = False
backoff_delay = 1  # Start wait with delay of 1 second.
print("Poll for result...")

# Keep polling the state until the execution finishes,
# using exponential backoff.
while not execution_finished:
    execution = execution_client.get_execution(
        request={"name": response.name}
    )
    execution_finished = execution.state != executions.Execution.State.ACTIVE

    # If we haven't seen the result yet, keep waiting.
    if not execution_finished:
        print("- Waiting for results...")
        time.sleep(backoff_delay)
        # Double the delay to provide exponential backoff.
        backoff_delay *= 2
    else:
        print(f"Execution finished with state: {execution.state.name}")
        print(f"Execution results: {execution.result}")

Esegui il codice campione

Puoi eseguire il codice campione ed eseguire il flusso di lavoro. L'esecuzione di un workflow esegue la definizione del workflow di cui è stato eseguito il deployment associata al workflow.

  1. Per eseguire l'esempio, installa prima le dipendenze:

    C# 

    dotnet restore

    Go 

    go mod download

    Java 

    mvn compile

    Node.js 

    npm install -D tsx

    Python 

    pip3 install -r requirements.txt

  2. Esegui lo script:

    C# 

    GOOGLE_CLOUD_PROJECT=PROJECT_ID LOCATION=CLOUD_REGION WORKFLOW=WORKFLOW_NAME dotnet run

    Go 

    GOOGLE_CLOUD_PROJECT=PROJECT_ID LOCATION=CLOUD_REGION WORKFLOW=WORKFLOW_NAME go run .

    Java 

    GOOGLE_CLOUD_PROJECT=PROJECT_ID LOCATION=CLOUD_REGION WORKFLOW=WORKFLOW_NAME mvn compile exec:java -Dexec.mainClass=com.example.workflows.WorkflowsQuickstart

    Node.js 

    npx tsx index.js

    Python 

    GOOGLE_CLOUD_PROJECT=PROJECT_ID LOCATION=CLOUD_REGION WORKFLOW=WORKFLOW_NAME python3 main.py

    Sostituisci quanto segue:

    • PROJECT_ID: il nome del tuo Google Cloud progetto
    • CLOUD_REGION: la posizione del workflow (valore predefinito: us-central1)
    • WORKFLOW_NAME: il nome del workflow (valore predefinito: myFirstWorkflow)

    L'output è simile al seguente:

    Execution finished with state: SUCCEEDED
Execution results: ["Thursday","Thursday Night Football","Thursday (band)","Thursday Island","Thursday (album)","Thursday Next","Thursday at the Square","Thursday's Child (David Bowie song)","Thursday Afternoon","Thursday (film)"]

Passare dati in una richiesta di esecuzione

A seconda del linguaggio della libreria client, puoi anche passare un argomento di runtime in una richiesta di esecuzione. Ad esempio:

C# 


public class ExecuteWorkflowWithArgumentsSample
{
    /// <summary>
    /// Execute a workflow with arguments and return the execution operation.
    /// </summary>
    /// <param name="projectID">Your Google Cloud Project ID.</param>
    /// <param name="locationID">The region where your workflow is located.</param>
    /// <param name="workflowID">Your Workflow ID.</param>
    /// <returns>
    /// An Execute object representing the completed workflow execution.
    /// </returns>
    public async Task<Execution> ExecuteWorkflowWithArguments(
        string projectId = "YOUR-PROJECT-ID",
        string locationID = "YOUR-LOCATION-ID",
        string workflowID = "YOUR-WORKFLOW-ID")
    {
        // Initialize the client.
        ExecutionsClient client = await ExecutionsClient.CreateAsync();

        // Build the parent location path.
        WorkflowName parent = new WorkflowName(projectId, locationID, workflowID);

        // Serialize the argument.
        string argument = JsonSerializer.Serialize(new
        {
            searchTerm = "Cloud"
        });

        // Create an execution request.
        CreateExecutionRequest createExecutionRequest = new CreateExecutionRequest
        {
            ParentAsWorkflowName = parent,
            Execution = new Execution
            {
                Argument = argument,
            }
        };

        // Execute the operation and recieve the execution.
        Execution execution = await client.CreateExecutionAsync(createExecutionRequest);
        Console.WriteLine("- Execution started...");

        TimeSpan backoffDelay = TimeSpan.FromSeconds(1);
        TimeSpan maxBackoffDelay = TimeSpan.FromSeconds(16);

        // Keep polling the state until the execution finishes, using exponential backoff.
        while (execution.State == Execution.Types.State.Active)
        {
            await Task.Delay(backoffDelay);

            // Implement exponential backoff by doubling the delay, but limiting it to a practical duration.
            backoffDelay = (backoffDelay < maxBackoffDelay) ? backoffDelay * 2 : maxBackoffDelay;

            execution = await client.GetExecutionAsync(execution.Name);
        }

        // Print results.
        Console.WriteLine($"Execution finished with state: {execution.State}");
        Console.WriteLine($"Execution results: {execution.Result}");

        // Return the fetched execution.
        return execution;
    }
}

Go 

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"time"

	workflowexecutions "google.golang.org/api/workflowexecutions/v1"
)

// Execute a workflow with arguments and print the execution results.
//
// For more information about Workflows see:
// https://cloud.google.com/workflows/docs/overview
func executeWorkflowWithArguments(w io.Writer, projectID, workflowID, locationID string) error {
	// TODO(developer): Uncomment and update the following lines:
	// projectID := "YOUR_PROJECT_ID"
	// workflowID := "YOUR_WORKFLOW_ID"
	// locationID := "YOUR_LOCATION_ID"

	ctx := context.Background()

	// Construct the location path.
	parent := fmt.Sprintf("projects/%s/locations/%s/workflows/%s", projectID, locationID, workflowID)

	// Create execution client.
	client, err := workflowexecutions.NewService(ctx)
	if err != nil {
		return fmt.Errorf("workflowexecutions.NewService error: %w", err)
	}

	// Get execution service.
	service := client.Projects.Locations.Workflows.Executions

	// Create argument.
	argument := struct {
		SearchTerm string `json:"searchTerm"`
	}{
		SearchTerm: "Cloud",
	}

	// Encode argument to JSON.
	argumentEncoded, err := json.Marshal(argument)
	if err != nil {
		return fmt.Errorf("json.Marshal error: %w", err)
	}

	// Build and run the new workflow execution adding the argument.
	res, err := service.Create(parent, &workflowexecutions.Execution{
		Argument: string(argumentEncoded),
	}).Do()
	if err != nil {
		return fmt.Errorf("service.Create.Do error: %w", err)
	}
	fmt.Fprintln(w, "- Execution started...")

	// Set initial value for backoff delay in one second.
	backoffDelay := time.Second

	for res.State == "ACTIVE" {
		time.Sleep(backoffDelay)

		// Request the updated state for the execution.
		getReq := service.Get(res.Name)
		res, err = getReq.Do()
		if err != nil {
			return fmt.Errorf("getReq error: %w", err)
		}

		// Double the delay to provide exponential backoff (capped at 16 seconds).
		if backoffDelay < time.Second*16 {
			backoffDelay *= 2
		}
	}

	fmt.Fprintf(w, "Execution finished with state: %s\n", res.State)
	fmt.Fprintf(w, "Execution arguments: %s", res.Argument)
	fmt.Fprintf(w, "Execution results: %s\n", res.Result)

	return nil
}

Java 

// Creates the execution object
CreateExecutionRequest request =
    CreateExecutionRequest.newBuilder()
        .setParent(parent.toString())
        .setExecution(Execution.newBuilder().setArgument("{\"searchTerm\":\"Friday\"}").build())
        .build();

Node.js 

// Execute workflow
try {
  const createExecutionRes = await client.createExecution({
    parent: client.workflowPath(projectId, location, workflow),
    execution: {
      argument: JSON.stringify({"searchTerm": "Friday"})
    }
});
const executionName = createExecutionRes[0].name;

Python 

import time

from google.cloud import workflows_v1
from google.cloud.workflows import executions_v1

from google.cloud.workflows.executions_v1.types import executions

# TODO(developer): Update and uncomment the following lines.
# project_id = "YOUR_PROJECT_ID"
# location = "YOUR_LOCATION"  # For example: us-central1
# workflow_id = "YOUR_WORKFLOW_ID"  # For example: myFirstWorkflow

# Initialize API clients.
execution_client = executions_v1.ExecutionsClient()
workflows_client = workflows_v1.WorkflowsClient()

# Construct the fully qualified location path.
parent = workflows_client.workflow_path(project_id, location, workflow_id)

# Execute the workflow adding an dictionary of arguments.
# Find more information about the Execution object here:
# https://cloud.google.com/python/docs/reference/workflows/latest/google.cloud.workflows.executions_v1.types.Execution
execution = executions_v1.Execution(
    name=parent,
    argument='{"searchTerm": "Cloud"}',
)

response = execution_client.create_execution(
    parent=parent,
    execution=execution,
)
print(f"Created execution: {response.name}")

# Wait for execution to finish, then print results.
execution_finished = False
backoff_delay = 1  # Start wait with delay of 1 second.
print("Poll for result...")

# Keep polling the state until the execution finishes,
# using exponential backoff.
while not execution_finished:
    execution = execution_client.get_execution(
        request={"name": response.name}
    )
    execution_finished = execution.state != executions.Execution.State.ACTIVE

    # If we haven't seen the result yet, keep waiting.
    if not execution_finished:
        print("- Waiting for results...")
        time.sleep(backoff_delay)
        # Double the delay to provide exponential backoff.
        backoff_delay *= 2
    else:
        print(f"Execution finished with state: {execution.state.name}")
        print(f"Execution results: {execution.result}")

Per saperne di più sul passaggio di argomenti di runtime, consulta Passaggio di argomenti di runtime in una richiesta di esecuzione.

Esegui la pulizia

Per evitare che al tuo account Google Cloud vengano addebitati costi relativi alle risorse utilizzate in questa pagina, elimina il progetto Google Cloud con le risorse.

  1. Elimina il flusso di lavoro creato:

    gcloud workflows delete myFirstWorkflow

  2. Quando ti viene chiesto se vuoi continuare, digita y.

Il workflow viene eliminato.

Passaggi successivi