Menjalankan alur kerja dengan menggunakan library klien

Anda dapat menjalankan alur kerja dan melihat hasil eksekusi menggunakan library klien.

Untuk mengetahui informasi selengkapnya tentang cara menginstal library klien dan menyiapkan lingkungan pengembangan, lihat Ringkasan library klien alur kerja.

Sebelum memulai

Batasan keamanan yang ditentukan oleh organisasi mungkin mencegah Anda menyelesaikan langkah-langkah berikut. Untuk mengetahui informasi pemecahan masalah, lihat Mengembangkan aplikasi di lingkungan Google Cloud yang terbatas.

Contoh berikut mengasumsikan bahwa Anda telah men-deploy alur kerja, myFirstWorkflow. Jika belum, deploy sekarang menggunakan Google Cloud Console atau Google Cloud CLI.
Download dan instal alat pengelolaan kode sumber Git.

Mendapatkan kode contoh

Clone repositori aplikasi contoh ke komputer lokal Anda:
Java
```
git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git
```
Atau, Anda dapat mendownload sampel sebagai file ZIP dan mengekstraknya.
Node.js
```
git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git
```
Atau, Anda dapat mendownload sampel sebagai file ZIP dan mengekstraknya.
Python
```
git clone https://github.com/GoogleCloudPlatform/python-docs-samples.git
```
Atau, Anda dapat mendownload sampel sebagai file ZIP dan mengekstraknya.

Ubah ke direktori yang berisi kode contoh Workflows:

Java

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

Node.js

cd nodejs-docs-samples/workflows/quickstart/

Python

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

Lihat kode contoh:

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

def execute_workflow(
    project: str, location: str = "us-central1", workflow: str = "myFirstWorkflow"
) -> Execution:
    """Execute a workflow and print the execution results.

    A workflow consists of a series of steps described using the Workflows syntax, and can be written in either YAML or JSON.

    Args:
        project: The Google Cloud project id which contains the workflow to execute.
        location: The location for the workflow
        workflow: The ID of the workflow to execute.

    Returns:
        The execution response.
    """
    # Set up API clients.
    execution_client = executions_v1.ExecutionsClient()
    workflows_client = workflows_v1.WorkflowsClient()
    # Construct the fully qualified location path.
    parent = workflows_client.workflow_path(project, location, workflow)

    # 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...")
    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, wait a second.
        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}")
            return execution

Program ini akan melakukan hal berikut:

Menyiapkan Library Klien Cloud untuk Workflows.
Menjalankan alur kerja.
Melakukan polling terhadap eksekusi alur kerja (menggunakan backoff eksponensial) hingga eksekusi dihentikan.
Mencetak hasil eksekusi.

Menjalankan contoh

Untuk menjalankan contoh, instal dependensi terlebih dahulu:
Java
```
mvn compile
```
Node.js
```
npm install
```
Python
```
pip3 install -r requirements.txt
```

Jalankan skrip:

Java

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

Node.js

node . PROJECT_ID CLOUD_REGION WORKFLOW_NAME

Python

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

Ganti kode berikut:

PROJECT_ID: (wajib) Project ID untuk project Google Cloud
CLOUD_REGION: lokasi untuk alur kerja (default: us-central1)
WORKFLOW_NAME: ID alur kerja (default: myFirstWorkflow)

Outputnya mirip dengan hal berikut ini:

Execution finished with state: SUCCEEDED
["Sunday","Sunday in the Park with George","Sunday shopping","Sunday Bloody Sunday","Sunday Times Golden Globe Race","Sunday All Stars","Sunday Night (South Korean TV series)","Sunday Silence","Sunday Without God","Sunday Independent (Ireland)"]

Meneruskan data dalam permintaan eksekusi

Bergantung pada bahasa library klien, Anda juga dapat meneruskan argumen runtime dalam permintaan eksekusi.

Misalnya, dengan menggunakan JavaScript:

// 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;

Atau, dengan menggunakan Java:

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

Untuk mengetahui informasi selengkapnya tentang meneruskan argumen runtime, lihat Meneruskan argumen runtime dalam permintaan eksekusi.

Pembersihan

Agar akun Google Cloud Anda tidak dikenakan biaya untuk resource yang digunakan pada halaman ini, ikuti langkah-langkah berikut.

Di konsol Google Cloud, buka halaman Workflows.

Buka Workflows
Dari daftar alur kerja, klik alur kerja untuk membuka halaman Detail alur kerja.
Klik Delete.
Ketik nama alur kerja, lalu klik Konfirmasi.

Menjalankan alur kerja dengan menggunakan library klien

Sebelum memulai

Mendapatkan kode contoh

Java

Node.js

Python

Java

Node.js

Python

Java

Node.js

Python

Menjalankan contoh

Java

Node.js

Python

Java

Node.js

Python

Meneruskan data dalam permintaan eksekusi

Pembersihan

Langkah selanjutnya