Vertex AI API v1 - Package cloud.google.com/go/aiplatform/apiv1 (v0.2.0)

Package aiplatform is an auto-generated package for the Vertex AI API.

Train high-quality custom machine learning models with minimal machine learning expertise and effort.

Example usage

To get started with this package, create a client.

ctx := context.Background()
c, err := aiplatform.NewDatasetClient(ctx)
if err != nil {
    // TODO: Handle error.
}
defer c.Close()

The client will use your default application credentials. Clients should be reused instead of created as needed. The methods of Client are safe for concurrent use by multiple goroutines. The returned client must be Closed when it is done being used.

Using the Client

The following is an example of making an API call with the newly created client.

ctx := context.Background()
c, err := aiplatform.NewDatasetClient(ctx)
if err != nil {
    // TODO: Handle error.
}
defer c.Close()

req := &aiplatformpb.CreateDatasetRequest{
    // TODO: Fill request struct fields.
    // See https://pkg.go.dev/google.golang.org/genproto/googleapis/cloud/aiplatform/v1#CreateDatasetRequest.
}
op, err := c.CreateDataset(ctx, req)
if err != nil {
    // TODO: Handle error.
}

resp, err := op.Wait(ctx)
if err != nil {
    // TODO: Handle error.
}
// TODO: Use resp.
_ = resp

Use of Context

The ctx passed to NewClient is used for authentication requests and for creating the underlying connection, but is not used for subsequent calls. Individual methods on the client use the ctx given to them.

To close the open connection, use the Close() method.

For information about setting deadlines, reusing contexts, and more please visit https://pkg.go.dev/cloud.google.com/go.

DefaultAuthScopes reports the default set of authentication scopes to use with this package.

AnnotationIterator manages a stream of *aiplatformpb.Annotation.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

BatchMigrateResourcesOperation manages a long-running operation from BatchMigrateResources.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

BatchPredictionJobIterator manages a stream of *aiplatformpb.BatchPredictionJob.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

CheckTrialEarlyStoppingStateOperation manages a long-running operation from CheckTrialEarlyStoppingState.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CreateDatasetOperation manages a long-running operation from CreateDataset.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CreateEndpointOperation manages a long-running operation from CreateEndpoint.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CreateIndexEndpointOperation manages a long-running operation from CreateIndexEndpoint.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CreateIndexOperation manages a long-running operation from CreateIndex.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CreateSpecialistPoolOperation manages a long-running operation from CreateSpecialistPool.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

CustomJobIterator manages a stream of *aiplatformpb.CustomJob.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

DataItemIterator manages a stream of *aiplatformpb.DataItem.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

DataLabelingJobIterator manages a stream of *aiplatformpb.DataLabelingJob.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

DatasetCallOptions contains the retry settings for each method of DatasetClient.

DatasetClient is a client for interacting with Vertex AI API. Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.

The service that handles the CRUD of Vertex AI Dataset and its child resources.

NewDatasetClient creates a new dataset service client based on gRPC. The returned client must be Closed when it is done being used to clean up its underlying connections.

The service that handles the CRUD of Vertex AI Dataset and its child resources.

Close closes the connection to the API service. The user should invoke this when the client is no longer required.

Connection returns a connection to the API service.

Deprecated.

CreateDataset creates a Dataset.

CreateDatasetOperation returns a new CreateDatasetOperation from a given name. The name must be that of a previously created CreateDatasetOperation, possibly from a different process.

DeleteDataset deletes a Dataset.

DeleteDatasetOperation returns a new DeleteDatasetOperation from a given name. The name must be that of a previously created DeleteDatasetOperation, possibly from a different process.

ExportData exports data from a Dataset.

ExportDataOperation returns a new ExportDataOperation from a given name. The name must be that of a previously created ExportDataOperation, possibly from a different process.

GetAnnotationSpec gets an AnnotationSpec.

GetDataset gets a Dataset.

ImportData imports data into a Dataset.

ImportDataOperation returns a new ImportDataOperation from a given name. The name must be that of a previously created ImportDataOperation, possibly from a different process.

ListAnnotations lists Annotations belongs to a dataitem

ListDataItems lists DataItems in a Dataset.

ListDatasets lists Datasets in a Location.

UpdateDataset updates a Dataset.

DatasetIterator manages a stream of *aiplatformpb.Dataset.

Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.

PageInfo supports pagination. See the google.golang.org/api/iterator package for details.

DeleteBatchPredictionJobOperation manages a long-running operation from DeleteBatchPredictionJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteCustomJobOperation manages a long-running operation from DeleteCustomJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteDataLabelingJobOperation manages a long-running operation from DeleteDataLabelingJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteDatasetOperation manages a long-running operation from DeleteDataset.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteEndpointOperation manages a long-running operation from DeleteEndpoint.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteHyperparameterTuningJobOperation manages a long-running operation from DeleteHyperparameterTuningJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteIndexEndpointOperation manages a long-running operation from DeleteIndexEndpoint.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteIndexOperation manages a long-running operation from DeleteIndex.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteModelDeploymentMonitoringJobOperation manages a long-running operation from DeleteModelDeploymentMonitoringJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteModelOperation manages a long-running operation from DeleteModel.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeletePipelineJobOperation manages a long-running operation from DeletePipelineJob.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteSpecialistPoolOperation manages a long-running operation from DeleteSpecialistPool.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeleteTrainingPipelineOperation manages a long-running operation from DeleteTrainingPipeline.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeployIndexOperation manages a long-running operation from DeployIndex.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.

Wait blocks until the long-running operation is completed, returning the response and any errors encountered.

See documentation of Poll for error-handling information.

DeployModelOperation manages a long-running operation from DeployModel.

Done reports whether the long-running operation has completed.

Metadata returns metadata associated with the long-running operation. Metadata itself does not contact the server, but Poll does. To get the latest metadata, call this method after a successful call to Poll. If the metadata is not available, the returned metadata and error are both nil.

Name returns the name of the long-running operation. The name is assigned by the server and is unique within the service from which the operation is created.

Poll fetches the latest state of the long-running operation.

Poll also fetches the latest metadata, which can be retrieved by Metadata.

If Poll fails, the error is returned and op is unmodified. If Poll succeeds and the operation has completed with failure, the error is returned and op.Done will return true. If Poll succeeds and the operation has completed successfully, op.Done will return true, and the response of the operation is returned. If Poll succeeds and the operation has not completed, the returned response and error are both nil.