以编程方式创建和管理数据传输

本页面介绍了如何通过 REST API 直接使用 Storage Transfer Service，以及如何利用 Java 和 Python 以编程方式在两种常见场景中使用该组件。要使用 Google Cloud Console 创建转移作业，请参阅使用 Console 创建和管理传输。

使用 Storage Transfer API 以编程方式配置或编辑传输作业时，必须采用世界协调时间 (UTC)。如需详细了解如何指定传输作业的时间表，请参阅时间表。

准备工作

在创建传输作业之前，请执行以下操作：

  1. 检查您是否拥有以下角色之一，以验证您是否拥有 Storage Transfer Service 访问权限：

    • roles/owner
    • roles/editor
    • roles/storagetransfer.admin
    • roles/storagetransfer.user

    • 至少包含 roles/storagetransfer.user 权限的自定义角色。

      如需详细了解如何添加和查看项目级权限，请参阅使用 IAM 权限处理项目。

    如需了解详情，请参阅排查访问权限问题。

    如需详细了解 Storage Transfer Service 中的 IAM 角色和权限，请参阅使用 IAM 角色和权限进行访问权限控制。

  2. 配置对数据源和数据接收器的访问权限。

将数据从 Amazon S3 传输到 Cloud Storage

本示例演示了如何将文件从 Amazon S3 传输到 Cloud Storage 存储分区。请务必查看配置访问权限和价格信息，以了解将数据从 Amazon S3 转移到 Cloud Storage 的影响。

创建转移作业

创建转移作业时，请勿在 Amazon S3 存储桶来源名称中为 bucketName 添加 s3:// 前缀。

REST

使用 transferJobs create 发出请求： 
POST https://storagetransfer.googleapis.com/v1/transferJobs
{
    "description": "YOUR DESCRIPTION",
    "status": "ENABLED",
    "projectId": "PROJECT_ID",
    "schedule": {
        "scheduleStartDate": {
            "day": 1,
            "month": 1,
            "year": 2015
        },
        "scheduleEndDate": {
            "day": 1,
            "month": 1,
            "year": 2015
        },
        "startTimeOfDay": {
            "hours": 1,
            "minutes": 1
        }
    },
    "transferSpec": {
        "awsS3DataSource": {
            "bucketName": "AWS_SOURCE_NAME",
            "awsAccessKey": {
                "accessKeyId": "AWS_ACCESS_KEY_ID",
                "secretAccessKey": "AWS_SECRET_ACCESS_KEY"
            }
        },
        "gcsDataSink": {
            "bucketName": "GCS_SINK_NAME"
        }
    }
}
响应：
200 OK
{
    "transferJob": [
        {
            "creationTime": "2015-01-01T01:01:00.000000000Z",
            "description": "YOUR DESCRIPTION",
            "name": "transferJobs/JOB_ID",
            "status": "ENABLED",
            "lastModificationTime": "2015-01-01T01:01:00.000000000Z",
            "projectId": "PROJECT_ID",
            "schedule": {
                "scheduleStartDate": {
                    "day": 1,
                    "month": 1,
                    "year": 2015
                },
                "scheduleEndDate": {
                    "day": 1,
                    "month": 1,
                    "year": 2015
                },
                "startTimeOfDay": {
                    "hours": 1,
                    "minutes": 1
                }
            },
            "transferSpec": {
                "awsS3DataSource": {
                    "bucketName": "AWS_SOURCE_NAME"
                },
                "gcsDataSink": {
                    "bucketName": "GCS_SINK_NAME"
                },
                "objectConditions": {},
                "transferOptions": {}
            }
        }
    ]
}

Java

如需详细了解如何创建 Storage Transfer Service 客户端，请参阅为 Google API 库创建 Storage Transfer Service 客户端。

storage/storage-transfer/src/main/java/com/google/cloud/storage/storagetransfer/samples/TransferFromAws.java 

import com.google.api.client.googleapis.util.Utils;
import com.google.api.services.storagetransfer.v1.Storagetransfer;
import com.google.api.services.storagetransfer.v1.StoragetransferScopes;
import com.google.api.services.storagetransfer.v1.model.AwsAccessKey;
import com.google.api.services.storagetransfer.v1.model.AwsS3Data;
import com.google.api.services.storagetransfer.v1.model.Date;
import com.google.api.services.storagetransfer.v1.model.GcsData;
import com.google.api.services.storagetransfer.v1.model.Schedule;
import com.google.api.services.storagetransfer.v1.model.TimeOfDay;
import com.google.api.services.storagetransfer.v1.model.TransferJob;
import com.google.api.services.storagetransfer.v1.model.TransferSpec;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.IOException;
import java.util.Calendar;

public class TransferFromAws {

  // Creates a one-off transfer job from Amazon S3 to Google Cloud Storage.
  public static void transferFromAws(String projectId,
      String jobDescription,
      String awsSourceBucket,
      String gcsSinkBucket,
      long startDateTime,
      String awsAccessKeyId,
      String awsSecretAccessKey) throws IOException {

    // Your Google Cloud Project ID
    // String projectId = "your-project-id";

    // A short description of this job
    // String jobDescription = "Sample transfer job from S3 to GCS.";

    // The name of the source AWS bucket to transfer data from
    // String awsSourceBucket = "yourAwsSourceBucket";

    // The name of the GCS bucket to transfer data to
    // String gcsSinkBucket = "your-gcs-bucket";

    // What day and time in UTC to start the transfer, expressed as an epoch date timestamp.
    // If this is in the past relative to when the job is created, it will run the next day.
    // long startDateTime =
    //     new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2000-01-01 00:00:00").getTime();

    // The ID used to access your AWS account. Should be accessed via environment variable.
    // String awsAccessKeyId = System.getenv("AWS_ACCESS_KEY_ID");

    // The Secret Key used to access your AWS account. Should be accessed via environment variable.
    // String awsSecretAccessKey = System.getenv("AWS_SECRET_ACCESS_KEY");

    // Set up source and sink
    TransferSpec transferSpec = new TransferSpec()
        .setAwsS3DataSource(
            new AwsS3Data()
                .setBucketName(awsSourceBucket)
                .setAwsAccessKey(
                    new AwsAccessKey()
                        .setAccessKeyId(awsAccessKeyId)
                        .setSecretAccessKey(awsSecretAccessKey)))
        .setGcsDataSink(new GcsData().setBucketName(gcsSinkBucket));

    // Parse epoch timestamp into the model classes
    Calendar startCalendar = Calendar.getInstance();
    startCalendar.setTimeInMillis(startDateTime);
    // Note that this is a Date from the model class package, not a java.util.Date
    Date startDate = new Date()
        .setYear(startCalendar.get(Calendar.YEAR))
        .setMonth(startCalendar.get(Calendar.MONTH) + 1)
        .setDay(startCalendar.get(Calendar.DAY_OF_MONTH));
    TimeOfDay startTime = new TimeOfDay()
        .setHours(startCalendar.get(Calendar.HOUR_OF_DAY))
        .setMinutes(startCalendar.get(Calendar.MINUTE))
        .setSeconds(startCalendar.get(Calendar.SECOND));
    Schedule schedule = new Schedule()
        .setScheduleStartDate(startDate)
        .setScheduleEndDate(startDate)
        .setStartTimeOfDay(startTime);

    // Set up the transfer job
    TransferJob transferJob =
        new TransferJob()
            .setDescription(jobDescription)
            .setProjectId(projectId)
            .setTransferSpec(transferSpec)
            .setSchedule(schedule)
            .setStatus("ENABLED");

    // Create a Transfer Service client
    GoogleCredentials credential = GoogleCredentials.getApplicationDefault();
    if (credential.createScopedRequired()) {
      credential = credential.createScoped(StoragetransferScopes.all());
    }
    Storagetransfer storageTransfer = new Storagetransfer.Builder(Utils.getDefaultTransport(),
        Utils.getDefaultJsonFactory(), new HttpCredentialsAdapter(credential))
        .build();

    // Create the transfer job
    TransferJob response = storageTransfer.transferJobs().create(transferJob).execute();

    System.out.println("Created transfer job from AWS to GCS:");
    System.out.println(response.toPrettyString());
  }
}

Python

如需了解如何创建 Storage Transfer Service 客户端，请参阅为 Google API 库创建客户端。

storage/transfer_service/aws_request.py 
"""Command-line sample that creates a one-time transfer from Amazon S3 to
Google Cloud Storage.

This sample is used on this page:

    https://cloud.google.com/storage/transfer/create-transfer

For more information, see README.md.
"""

import argparse
import datetime
import json

import googleapiclient.discovery

def main(description, project_id, start_date, start_time, source_bucket,
         access_key_id, secret_access_key, sink_bucket):
    """Create a one-time transfer from Amazon S3 to Google Cloud Storage."""
    storagetransfer = googleapiclient.discovery.build('storagetransfer', 'v1')

    # Edit this template with desired parameters.
    transfer_job = {
        'description': description,
        'status': 'ENABLED',
        'projectId': project_id,
        'schedule': {
            'scheduleStartDate': {
                'day': start_date.day,
                'month': start_date.month,
                'year': start_date.year
            },
            'scheduleEndDate': {
                'day': start_date.day,
                'month': start_date.month,
                'year': start_date.year
            },
            'startTimeOfDay': {
                'hours': start_time.hour,
                'minutes': start_time.minute,
                'seconds': start_time.second
            }
        },
        'transferSpec': {
            'awsS3DataSource': {
                'bucketName': source_bucket,
                'awsAccessKey': {
                    'accessKeyId': access_key_id,
                    'secretAccessKey': secret_access_key
                }
            },
            'gcsDataSink': {
                'bucketName': sink_bucket
            }
        }
    }

    result = storagetransfer.transferJobs().create(body=transfer_job).execute()
    print('Returned transferJob: {}'.format(
        json.dumps(result, indent=4)))

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('description', help='Transfer description.')
    parser.add_argument('project_id', help='Your Google Cloud project ID.')
    parser.add_argument('start_date', help='Date YYYY/MM/DD.')
    parser.add_argument('start_time', help='UTC Time (24hr) HH:MM:SS.')
    parser.add_argument('source_bucket', help='AWS source bucket name.')
    parser.add_argument('access_key_id', help='Your AWS access key id.')
    parser.add_argument(
        'secret_access_key',
        help='Your AWS secret access key.'
    )
    parser.add_argument('sink_bucket', help='GCS sink bucket name.')

    args = parser.parse_args()
    start_date = datetime.datetime.strptime(args.start_date, '%Y/%m/%d')
    start_time = datetime.datetime.strptime(args.start_time, '%H:%M:%S')

    main(
        args.description,
        args.project_id,
        start_date,
        start_time,
        args.source_bucket,
        args.access_key_id,
        args.secret_access_key,
        args.sink_bucket)

在 Microsoft Azure Blob Storage 和 Cloud Storage 之间转移

本示例演示了如何使用 Microsoft Azure Storage 共享访问签名 (SAS) 令牌将文件从 Microsoft Azure Storage 移至 Cloud Storage 存储桶。

如需详细了解 Microsoft Azure Storage SAS，请参阅使用共享访问签名 (SAS) 授予对 Azure Storage 资源的有限访问权限。

在开始查看配置访问权限和价格之前，请先了解将数据从 Microsoft Azure Storage 移动到 Cloud Storage 的影响。

REST

使用 transferJobs create 发出请求： 
POST https://storagetransfer.googleapis.com/v1/transferJobs
{
    "description": "YOUR DESCRIPTION",
    "status": "ENABLED",
    "projectId": "PROJECT_ID",
    "schedule": {
        "scheduleStartDate": {
            "day": 14,
            "month": 2,
            "year": 2020
        },
        "scheduleEndDate": {
            "day": 14
            "month": 2,
            "year": 2020
        },
        "startTimeOfDay": {
            "hours": 1,
            "minutes": 1
        }
    },
    "transferSpec": {
        "azureBlobStorageDataSource": {
            "storageAccount": "AZURE_SOURCE_NAME",
            "azureCredentials": {
                "sasToken": "AZURE_SAS_TOKEN",
            },
            "container": "AZURE_CONTAINER",
        },
        "gcsDataSink": {
            "bucketName": "GCS_SINK_NAME"
        }
    }
}
响应：
200 OK
{
    "transferJob": [
        {
            "creationTime": "2020-02-14T01:01:00.000000000Z",
            "description": "YOUR DESCRIPTION",
            "name": "transferJobs/JOB_ID",
            "status": "ENABLED",
            "lastModificationTime": "2020-02-14T01:01:00.000000000Z",
            "projectId": "PROJECT_ID",
            "schedule": {
                "scheduleStartDate": {
                    "day": 14
                    "month": 2,
                    "year": 2020
                },
                "scheduleEndDate": {
                    "day": 14,
                    "month": 2,
                    "year": 2020
                },
                "startTimeOfDay": {
                    "hours": 1,
                    "minutes": 1
                }
            },
            "transferSpec": {
                "azureBlobStorageDataSource": {
                    "storageAccount": "AZURE_SOURCE_NAME",
                    "azureCredentials": {
                        "sasToken": "AZURE_SAS_TOKEN",
                    },
                    "container": "AZURE_CONTAINER",
                },
                "objectConditions": {},
                "transferOptions": {}
            }
        }
    ]
}

在 Cloud Storage 存储桶之间传输数据

本示例演示了如何将文件从一个 Cloud Storage 存储桶传输到另一个 Cloud Storage 存储桶。例如，您可以将数据复制到位于另一个位置的存储桶。

创建转移作业

REST

使用 transferJobs create 发出请求： 
POST https://storagetransfer.googleapis.com/v1/transferJobs
{
    "description": "YOUR DESCRIPTION",
    "status": "ENABLED",
    "projectId": "PROJECT_ID",
    "schedule": {
        "scheduleStartDate": {
            "day": 1,
            "month": 1,
            "year": 2015
        },
        "startTimeOfDay": {
            "hours": 1,
            "minutes": 1
        }
    },
    "transferSpec": {
        "gcsDataSource": {
            "bucketName": "GCS_SOURCE_NAME"
        },
        "gcsDataSink": {
            "bucketName": "GCS_NEARLINE_SINK_NAME"
        },
        "objectConditions": {
            "minTimeElapsedSinceLastModification": "2592000s"
        },
        "transferOptions": {
            "deleteObjectsFromSourceAfterTransfer": true
        }
    }
}
响应：
200 OK
{
    "transferJob": [
        {
            "creationTime": "2015-01-01T01:01:00.000000000Z",
            "description": "YOUR DESCRIPTION",
            "name": "transferJobs/JOB_ID",
            "status": "ENABLED",
            "lastModificationTime": "2015-01-01T01:01:00.000000000Z",
            "projectId": "PROJECT_ID",
            "schedule": {
                "scheduleStartDate": {
                    "day": 1,
                    "month": 1,
                    "year": 2015
                },
                "startTimeOfDay": {
                    "hours": 1,
                    "minutes": 1
                }
            },
            "transferSpec": {
                "gcsDataSource": {
                    "bucketName": "GCS_SOURCE_NAME",
                },
                "gcsDataSink": {
                    "bucketName": "GCS_NEARLINE_SINK_NAME"
                },
                "objectConditions": {
                    "minTimeElapsedSinceLastModification": "2592000.000s"
                },
                "transferOptions": {
                    "deleteObjectsFromSourceAfterTransfer": true
                }
            }
        }
    ]
}

Java

如需了解如何创建 Storage Transfer Service 客户端，请参阅为 Google API 库创建客户端。

storage/storage-transfer/src/main/java/com/google/cloud/storage/storagetransfer/samples/TransferToNearline.java 
import com.google.api.client.googleapis.util.Utils;
import com.google.api.services.storagetransfer.v1.Storagetransfer;
import com.google.api.services.storagetransfer.v1.StoragetransferScopes;
import com.google.api.services.storagetransfer.v1.model.Date;
import com.google.api.services.storagetransfer.v1.model.GcsData;
import com.google.api.services.storagetransfer.v1.model.ObjectConditions;
import com.google.api.services.storagetransfer.v1.model.Schedule;
import com.google.api.services.storagetransfer.v1.model.TimeOfDay;
import com.google.api.services.storagetransfer.v1.model.TransferJob;
import com.google.api.services.storagetransfer.v1.model.TransferOptions;
import com.google.api.services.storagetransfer.v1.model.TransferSpec;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.IOException;
import java.util.Calendar;

public class TransferToNearline {
  /** Creates a one-off transfer job that transfers objects in a standard GCS bucket that are more
   *  than 30 days old to a Nearline GCS bucket.
   */
  public static void transferToNearline(String projectId,
      String jobDescription,
      String gcsSourceBucket,
      String gcsNearlineSinkBucket,
      long startDateTime) throws IOException {

    // Your Google Cloud Project ID
    // String projectId = "your-project-id";

    // A short description of this job
    // String jobDescription = "Sample transfer job of old objects to a Nearline GCS bucket.";

    // The name of the source GCS bucket to transfer data from
    // String gcsSourceBucket = "your-gcs-source-bucket";

    // The name of the Nearline GCS bucket to transfer old objects to
    // String gcsSinkBucket = "your-nearline-gcs-bucket";

    // What day and time in UTC to start the transfer, expressed as an epoch date timestamp.
    // If this is in the past relative to when the job is created, it will run the next day.
    // long startDateTime =
    //     new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2000-01-01 00:00:00").getTime();

    // Parse epoch timestamp into the model classes
    Calendar startCalendar = Calendar.getInstance();
    startCalendar.setTimeInMillis(startDateTime);
    // Note that this is a Date from the model class package, not a java.util.Date
    Date date = new Date()
        .setYear(startCalendar.get(Calendar.YEAR))
        .setMonth(startCalendar.get(Calendar.MONTH) + 1)
        .setDay(startCalendar.get(Calendar.DAY_OF_MONTH));
    TimeOfDay time = new TimeOfDay()
        .setHours(startCalendar.get(Calendar.HOUR_OF_DAY))
        .setMinutes(startCalendar.get(Calendar.MINUTE))
        .setSeconds(startCalendar.get(Calendar.SECOND));

    TransferJob transferJob =
        new TransferJob()
            .setDescription(jobDescription)
            .setProjectId(projectId)
            .setTransferSpec(
                new TransferSpec()
                    .setGcsDataSource(new GcsData().setBucketName(gcsSourceBucket))
                    .setGcsDataSink(new GcsData().setBucketName(gcsNearlineSinkBucket))
                    .setObjectConditions(
                        new ObjectConditions()
                            .setMinTimeElapsedSinceLastModification("2592000s" /* 30 days */))
                    .setTransferOptions(
                        new TransferOptions().setDeleteObjectsFromSourceAfterTransfer(true)))
            .setSchedule(new Schedule().setScheduleStartDate(date).setStartTimeOfDay(time))
            .setStatus("ENABLED");

    // Create a Transfer Service client
    GoogleCredentials credential = GoogleCredentials.getApplicationDefault();
    if (credential.createScopedRequired()) {
      credential = credential.createScoped(StoragetransferScopes.all());
    }
    Storagetransfer storageTransfer = new Storagetransfer.Builder(Utils.getDefaultTransport(),
        Utils.getDefaultJsonFactory(), new HttpCredentialsAdapter(credential))
        .build();

    // Create the transfer job
    TransferJob response = storageTransfer.transferJobs().create(transferJob).execute();

    System.out.println("Created transfer job from standard bucket to Nearline bucket:");
    System.out.println(response.toPrettyString());
  }
}

Python

如需了解如何创建 Storage Transfer Service 客户端，请参阅为 Google API 库创建客户端。

storage/transfer_service/nearline_request.py 

"""Command-line sample that creates a daily transfer from a standard
GCS bucket to a Nearline GCS bucket for objects untouched for 30 days.

This sample is used on this page:

    https://cloud.google.com/storage/transfer/create-transfer

For more information, see README.md.
"""

import argparse
import datetime
import json

import googleapiclient.discovery

def main(description, project_id, start_date, start_time, source_bucket,
         sink_bucket):
    """Create a daily transfer from Standard to Nearline Storage class."""
    storagetransfer = googleapiclient.discovery.build('storagetransfer', 'v1')

    # Edit this template with desired parameters.
    transfer_job = {
        'description': description,
        'status': 'ENABLED',
        'projectId': project_id,
        'schedule': {
            'scheduleStartDate': {
                'day': start_date.day,
                'month': start_date.month,
                'year': start_date.year
            },
            'startTimeOfDay': {
                'hours': start_time.hour,
                'minutes': start_time.minute,
                'seconds': start_time.second
            }
        },
        'transferSpec': {
            'gcsDataSource': {
                'bucketName': source_bucket
            },
            'gcsDataSink': {
                'bucketName': sink_bucket
            },
            'objectConditions': {
                'minTimeElapsedSinceLastModification': '2592000s'  # 30 days
            },
            'transferOptions': {
                'deleteObjectsFromSourceAfterTransfer': 'true'
            }
        }
    }

    result = storagetransfer.transferJobs().create(body=transfer_job).execute()
    print('Returned transferJob: {}'.format(
        json.dumps(result, indent=4)))

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('description', help='Transfer description.')
    parser.add_argument('project_id', help='Your Google Cloud project ID.')
    parser.add_argument('start_date', help='Date YYYY/MM/DD.')
    parser.add_argument('start_time', help='UTC Time (24hr) HH:MM:SS.')
    parser.add_argument('source_bucket', help='Standard GCS bucket name.')
    parser.add_argument('sink_bucket', help='Nearline GCS bucket name.')

    args = parser.parse_args()
    start_date = datetime.datetime.strptime(args.start_date, '%Y/%m/%d')
    start_time = datetime.datetime.strptime(args.start_time, '%H:%M:%S')

    main(
        args.description,
        args.project_id,
        start_date,
        start_time,
        args.source_bucket,
        args.sink_bucket)

指定来源路径和目标路径

来源路径和目标路径可让您在将数据转移到 Cloud Storage 存储桶时指定来源目录和目标目录。例如，假设您有文件 file1.txt 和 file2.txt，以及一个名为 B 的 Cloud Storage 存储桶。如果您设置了名为 my-stuff 的目标路径，则在转移完成后，您的文件将位于 gs://B/my-stuff/file1.txt 和 gs://B/my-stuff/file2.txt。

指定来源路径

要在创建转移作业时指定来源路径，请在 TransferSpec 规范的 gcsDataSource 字段中添加 path 字段：

{
  gcsDataSource: {
    bucketName: "SOURCE_BUCKET",
    path: "SOURCE_PATH/",
  },
}

在此示例中：

  • SOURCE_BUCKET：来源 Cloud Storage 存储桶。
  • SOURCE_PATH：来源 Cloud Storage 路径。

指定目标路径

要在创建转移作业时指定目标文件夹，请在 TransferSpec 规范的 gcsDataSink 字段中添加 path 字段：

{
  gcsDataSink: {
    bucketName: "DESTINATION_BUCKET",
    path: "DESTINATION_PATH/",
  },
}

在此示例中：

  • DESTINATION_BUCKET：目标 Cloud Storage 存储桶。
  • DESTINATION_PATH：目标 Cloud Storage 路径

完整的示例请求

以下是完整请求的示例：

POST https://storagetransfer.googleapis.com/v1/transferJobs
{
    "description": "YOUR DESCRIPTION",
    "status": "ENABLED",
    "projectId": "PROJECT_ID",
    "schedule": {
        "scheduleStartDate": {
            "day": 1,
            "month": 1,
            "year": 2015
        },
        "startTimeOfDay": {
            "hours": 1,
            "minutes": 1
        }
    },
    "transferSpec": {
        "gcsDataSource": {
            "bucketName": "GCS_SOURCE_NAME",
            "path": "GCS_SOURCE_PATH",
        },
        "gcsDataSink": {
            "bucketName": "GCS_SINK_NAME",
            "path": "GCS_SINK_PATH",
        },
        "objectConditions": {
            "minTimeElapsedSinceLastModification": "2592000s"
        },
        "transferOptions": {
            "deleteObjectsFromSourceAfterTransfer": true
        }
    }

}

检查转移操作状态

当您使用 transferJobs.create 时，将返回 TransferJob 资源。

您可以在使用 transferJobs.get 创建作业后检查转移状态。如果转移作业的操作已开始，则会返回包含已填充的 latestOperationName 字段的 TransferJob。相反，如果转移作业的操作尚未启动，则 latestOperationName 字段为空。

查看转移作业的状态

REST

使用 transferJobs get 发出请求： 
GET https://storagetransfer.googleapis.com/v1/{jobName="name"}

Java

storage/storage-transfer/src/main/java/com/google/cloud/storage/storagetransfer/samples/CheckLatestTransferOperation.java 

import com.google.api.client.googleapis.util.Utils;
import com.google.api.services.storagetransfer.v1.Storagetransfer;
import com.google.api.services.storagetransfer.v1.StoragetransferScopes;
import com.google.api.services.storagetransfer.v1.model.Operation;
import com.google.api.services.storagetransfer.v1.model.TransferJob;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.IOException;

public class CheckLatestTransferOperation {

  // Gets the requested transfer job and checks its latest operation
  public static void checkLatestTransferOperation(String projectId, String jobName)
      throws IOException {
    // Your Google Cloud Project ID
    // String projectId = "your-project-id";

    // The name of the job to check
    // String jobName = "myJob/1234567890";

    // Create Storage Transfer client
    GoogleCredentials credential = GoogleCredentials.getApplicationDefault();
    if (credential.createScopedRequired()) {
      credential = credential.createScoped(StoragetransferScopes.all());
    }
    Storagetransfer storageTransfer = new Storagetransfer.Builder(Utils.getDefaultTransport(),
        Utils.getDefaultJsonFactory(), new HttpCredentialsAdapter(credential))
        .build();

    // Get transfer job and check latest operation
    TransferJob transferJob = storageTransfer.transferJobs().get(jobName, projectId).execute();
    String latestOperationName = transferJob.getLatestOperationName();

    if (latestOperationName != null) {
      Operation latestOperation = storageTransfer.transferOperations().get(latestOperationName)
          .execute();
      System.out.println("The latest operation for transfer job " + jobName + " is:");
      System.out.println(latestOperation.toPrettyString());

    } else {
      System.out.println("Transfer job " + jobName + " does not have an operation scheduled yet,"
          + " try again once the job starts running.");
    }
  }
}

Python

storage/transfer_service/check_latest_transfer_operation.py 

"""Command-line sample that checks the latest operation of a transfer.
This sample is used on this page:
    https://cloud.google.com/storage/transfer/create-transfer
For more information, see README.md.
"""

import argparse
import json

import googleapiclient.discovery

def check_latest_transfer_operation(project_id, job_name):
    """Check the latest transfer operation associated with a transfer job."""
    storagetransfer = googleapiclient.discovery.build("storagetransfer", "v1")

    transferJob = (
        storagetransfer.transferJobs()
        .get(projectId=project_id, jobName=job_name)
        .execute()
    )
    latestOperationName = transferJob.get("latestOperationName")

    if latestOperationName:
        result = (
            storagetransfer.transferOperations().get(name=latestOperationName).execute()
        )
        print(
            "The latest operation for job"
            + job_name
            + " is: {}".format(json.dumps(result, indent=4, sort_keys=True))
        )

    else:
        print(
            "Transfer job "
            + job_name
            + " does not have an operation scheduled yet, "
            + "try again once the job starts running."
        )

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
    )
    parser.add_argument("project_id", help="Your Google Cloud project ID.")
    parser.add_argument("job_name", help="Your job name.")

    args = parser.parse_args()

    check_latest_transfer_operation(args.project_id, args.job_name)

取消转移操作

如要取消单个转移操作，请使用 transferOperations cancel 方法。如要删除整个转移作业（包括已安排的未来转移操作），请使用transferJobs patch 方法将转移作业的状态设置为 DELETED。更新作业的转移状态不会影响正在进行的转移操作。如要取消正在进行的转移操作，请使用 transferOperations cancel 方法。

后续步骤

了解如何使用 Cloud Storage。