vision/apiv1/image_annotator_client.go - gocloud - Git at Google

 // Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 // Code generated by protoc-gen-go_gapic. DO NOT EDIT.

 package vision

 import (
 	"context"
 	"fmt"
 	"math"
 	"net/url"
 	"time"

 	"cloud.google.com/go/longrunning"
 	lroauto "cloud.google.com/go/longrunning/autogen"
 	gax "github.com/googleapis/gax-go/v2"
 	"google.golang.org/api/option"
 	gtransport "google.golang.org/api/transport/grpc"
 	visionpb "google.golang.org/genproto/googleapis/cloud/vision/v1"
 	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
 )

 // ImageAnnotatorCallOptions contains the retry settings for each method of ImageAnnotatorClient.
 type ImageAnnotatorCallOptions struct {
 	BatchAnnotateImages      []gax.CallOption
 	BatchAnnotateFiles       []gax.CallOption
 	AsyncBatchAnnotateImages []gax.CallOption
 	AsyncBatchAnnotateFiles  []gax.CallOption
 }

 func defaultImageAnnotatorClientOptions() []option.ClientOption {
 	return []option.ClientOption{
 		option.WithEndpoint("vision.googleapis.com:443"),
 		option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
 		option.WithScopes(DefaultAuthScopes()...),
 		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
 			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
 	}
 }

 func defaultImageAnnotatorCallOptions() *ImageAnnotatorCallOptions {
 	return &ImageAnnotatorCallOptions{
 		BatchAnnotateImages: []gax.CallOption{
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        60000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 		BatchAnnotateFiles: []gax.CallOption{
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        60000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 		AsyncBatchAnnotateImages: []gax.CallOption{
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        60000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 		AsyncBatchAnnotateFiles: []gax.CallOption{
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.DeadlineExceeded,
 					codes.Unavailable,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        60000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 	}
 }

 // ImageAnnotatorClient is a client for interacting with Cloud Vision API.
 //
 // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
 type ImageAnnotatorClient struct {
 	// Connection pool of gRPC connections to the service.
 	connPool gtransport.ConnPool

 	// The gRPC API client.
 	imageAnnotatorClient visionpb.ImageAnnotatorClient

 	// LROClient is used internally to handle longrunning operations.
 	// It is exposed so that its CallOptions can be modified if required.
 	// Users should not Close this client.
 	LROClient *lroauto.OperationsClient

 	// The call options for this service.
 	CallOptions *ImageAnnotatorCallOptions

 	// The x-goog-* metadata to be sent with each request.
 	xGoogMetadata metadata.MD
 }

 // NewImageAnnotatorClient creates a new image annotator client.
 //
 // Service that performs Google Cloud Vision API detection tasks over client
 // images, such as face, landmark, logo, label, and text detection. The
 // ImageAnnotator service returns detected entities from the images.
 func NewImageAnnotatorClient(ctx context.Context, opts ...option.ClientOption) (*ImageAnnotatorClient, error) {
 	connPool, err := gtransport.DialPool(ctx, append(defaultImageAnnotatorClientOptions(), opts...)...)
 	if err != nil {
 		return nil, err
 	}
 	c := &ImageAnnotatorClient{
 		connPool:    connPool,
 		CallOptions: defaultImageAnnotatorCallOptions(),

 		imageAnnotatorClient: visionpb.NewImageAnnotatorClient(connPool),
 	}
 	c.setGoogleClientInfo()

 	c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
 	if err != nil {
 		// This error "should not happen", since we are just reusing old connection pool
 		// and never actually need to dial.
 		// If this does happen, we could leak connp. However, we cannot close conn:
 		// If the user invoked the constructor with option.WithGRPCConn,
 		// we would close a connection that's still in use.
 		// TODO: investigate error conditions.
 		return nil, err
 	}
 	return c, nil
 }

 // Connection returns a connection to the API service.
 //
 // Deprecated.
 func (c *ImageAnnotatorClient) Connection() *grpc.ClientConn {
 	return c.connPool.Conn()
 }

 // Close closes the connection to the API service. The user should invoke this when
 // the client is no longer required.
 func (c *ImageAnnotatorClient) Close() error {
 	return c.connPool.Close()
 }

 // setGoogleClientInfo sets the name and version of the application in
 // the `x-goog-api-client` header passed on each request. Intended for
 // use by Google-written clients.
 func (c *ImageAnnotatorClient) setGoogleClientInfo(keyval ...string) {
 	kv := append([]string{"gl-go", versionGo()}, keyval...)
 	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
 	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
 }

 // BatchAnnotateImages run image detection and annotation for a batch of images.
 func (c *ImageAnnotatorClient) BatchAnnotateImages(ctx context.Context, req *visionpb.BatchAnnotateImagesRequest, opts ...gax.CallOption) (*visionpb.BatchAnnotateImagesResponse, error) {
 	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
 	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
 	opts = append(c.CallOptions.BatchAnnotateImages[0:len(c.CallOptions.BatchAnnotateImages):len(c.CallOptions.BatchAnnotateImages)], opts...)
 	var resp *visionpb.BatchAnnotateImagesResponse
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.imageAnnotatorClient.BatchAnnotateImages(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // BatchAnnotateFiles service that performs image detection and annotation for a batch of files.
 // Now only “application/pdf”, “image/tiff” and “image/gif” are supported.
 //
 // This service will extract at most 5 (customers can specify which 5 in
 // AnnotateFileRequest.pages) frames (gif) or pages (pdf or tiff) from each
 // file provided and perform detection and annotation for each image
 // extracted.
 func (c *ImageAnnotatorClient) BatchAnnotateFiles(ctx context.Context, req *visionpb.BatchAnnotateFilesRequest, opts ...gax.CallOption) (*visionpb.BatchAnnotateFilesResponse, error) {
 	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
 	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
 	opts = append(c.CallOptions.BatchAnnotateFiles[0:len(c.CallOptions.BatchAnnotateFiles):len(c.CallOptions.BatchAnnotateFiles)], opts...)
 	var resp *visionpb.BatchAnnotateFilesResponse
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.imageAnnotatorClient.BatchAnnotateFiles(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 // AsyncBatchAnnotateImages run asynchronous image detection and annotation for a list of images.
 //
 // Progress and results can be retrieved through the
 // google.longrunning.Operations interface.
 // Operation.metadata contains OperationMetadata (metadata).
 // Operation.response contains AsyncBatchAnnotateImagesResponse (results).
 //
 // This service will write image annotation outputs to json files in customer
 // GCS bucket, each json file containing BatchAnnotateImagesResponse proto.
 func (c *ImageAnnotatorClient) AsyncBatchAnnotateImages(ctx context.Context, req *visionpb.AsyncBatchAnnotateImagesRequest, opts ...gax.CallOption) (*AsyncBatchAnnotateImagesOperation, error) {
 	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
 	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
 	opts = append(c.CallOptions.AsyncBatchAnnotateImages[0:len(c.CallOptions.AsyncBatchAnnotateImages):len(c.CallOptions.AsyncBatchAnnotateImages)], opts...)
 	var resp *longrunningpb.Operation
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.imageAnnotatorClient.AsyncBatchAnnotateImages(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return &AsyncBatchAnnotateImagesOperation{
 		lro: longrunning.InternalNewOperation(c.LROClient, resp),
 	}, nil
 }

 // AsyncBatchAnnotateFiles run asynchronous image detection and annotation for a list of generic
 // files, such as PDF files, which may contain multiple pages and multiple
 // images per page. Progress and results can be retrieved through the
 // google.longrunning.Operations interface.
 // Operation.metadata contains OperationMetadata (metadata).
 // Operation.response contains AsyncBatchAnnotateFilesResponse (results).
 func (c *ImageAnnotatorClient) AsyncBatchAnnotateFiles(ctx context.Context, req *visionpb.AsyncBatchAnnotateFilesRequest, opts ...gax.CallOption) (*AsyncBatchAnnotateFilesOperation, error) {
 	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
 	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
 	opts = append(c.CallOptions.AsyncBatchAnnotateFiles[0:len(c.CallOptions.AsyncBatchAnnotateFiles):len(c.CallOptions.AsyncBatchAnnotateFiles)], opts...)
 	var resp *longrunningpb.Operation
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.imageAnnotatorClient.AsyncBatchAnnotateFiles(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return &AsyncBatchAnnotateFilesOperation{
 		lro: longrunning.InternalNewOperation(c.LROClient, resp),
 	}, nil
 }

 // AsyncBatchAnnotateFilesOperation manages a long-running operation from AsyncBatchAnnotateFiles.
 type AsyncBatchAnnotateFilesOperation struct {
 	lro *longrunning.Operation
 }

 // AsyncBatchAnnotateFilesOperation returns a new AsyncBatchAnnotateFilesOperation from a given name.
 // The name must be that of a previously created AsyncBatchAnnotateFilesOperation, possibly from a different process.
 func (c *ImageAnnotatorClient) AsyncBatchAnnotateFilesOperation(name string) *AsyncBatchAnnotateFilesOperation {
 	return &AsyncBatchAnnotateFilesOperation{
 		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
 	}
 }

 // Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
 //
 // See documentation of Poll for error-handling information.
 func (op *AsyncBatchAnnotateFilesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*visionpb.AsyncBatchAnnotateFilesResponse, error) {
 	var resp visionpb.AsyncBatchAnnotateFilesResponse
 	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
 		return nil, err
 	}
 	return &resp, nil
 }

 // 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.
 func (op *AsyncBatchAnnotateFilesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*visionpb.AsyncBatchAnnotateFilesResponse, error) {
 	var resp visionpb.AsyncBatchAnnotateFilesResponse
 	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
 		return nil, err
 	}
 	if !op.Done() {
 		return nil, nil
 	}
 	return &resp, nil
 }

 // 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.
 func (op *AsyncBatchAnnotateFilesOperation) Metadata() (*visionpb.OperationMetadata, error) {
 	var meta visionpb.OperationMetadata
 	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
 		return nil, nil
 	} else if err != nil {
 		return nil, err
 	}
 	return &meta, nil
 }

 // Done reports whether the long-running operation has completed.
 func (op *AsyncBatchAnnotateFilesOperation) Done() bool {
 	return op.lro.Done()
 }

 // 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.
 func (op *AsyncBatchAnnotateFilesOperation) Name() string {
 	return op.lro.Name()
 }

 // AsyncBatchAnnotateImagesOperation manages a long-running operation from AsyncBatchAnnotateImages.
 type AsyncBatchAnnotateImagesOperation struct {
 	lro *longrunning.Operation
 }

 // AsyncBatchAnnotateImagesOperation returns a new AsyncBatchAnnotateImagesOperation from a given name.
 // The name must be that of a previously created AsyncBatchAnnotateImagesOperation, possibly from a different process.
 func (c *ImageAnnotatorClient) AsyncBatchAnnotateImagesOperation(name string) *AsyncBatchAnnotateImagesOperation {
 	return &AsyncBatchAnnotateImagesOperation{
 		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
 	}
 }

 // Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
 //
 // See documentation of Poll for error-handling information.
 func (op *AsyncBatchAnnotateImagesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*visionpb.AsyncBatchAnnotateImagesResponse, error) {
 	var resp visionpb.AsyncBatchAnnotateImagesResponse
 	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
 		return nil, err
 	}
 	return &resp, nil
 }

 // 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.
 func (op *AsyncBatchAnnotateImagesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*visionpb.AsyncBatchAnnotateImagesResponse, error) {
 	var resp visionpb.AsyncBatchAnnotateImagesResponse
 	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
 		return nil, err
 	}
 	if !op.Done() {
 		return nil, nil
 	}
 	return &resp, nil
 }

 // 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.
 func (op *AsyncBatchAnnotateImagesOperation) Metadata() (*visionpb.OperationMetadata, error) {
 	var meta visionpb.OperationMetadata
 	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
 		return nil, nil
 	} else if err != nil {
 		return nil, err
 	}
 	return &meta, nil
 }

 // Done reports whether the long-running operation has completed.
 func (op *AsyncBatchAnnotateImagesOperation) Done() bool {
 	return op.lro.Done()
 }

 // 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.
 func (op *AsyncBatchAnnotateImagesOperation) Name() string {
 	return op.lro.Name()
 }
	// Copyright 2020 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// https://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

	package vision

	import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/option"
	gtransport "google.golang.org/api/transport/grpc"
	visionpb "google.golang.org/genproto/googleapis/cloud/vision/v1"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	)

	// ImageAnnotatorCallOptions contains the retry settings for each method of ImageAnnotatorClient.
	type ImageAnnotatorCallOptions struct {
	BatchAnnotateImages []gax.CallOption
	BatchAnnotateFiles []gax.CallOption
	AsyncBatchAnnotateImages []gax.CallOption
	AsyncBatchAnnotateFiles []gax.CallOption
	}

	func defaultImageAnnotatorClientOptions() []option.ClientOption {
	return []option.ClientOption{
	option.WithEndpoint("vision.googleapis.com:443"),
	option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
	option.WithScopes(DefaultAuthScopes()...),
	option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
	grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
	}

	func defaultImageAnnotatorCallOptions() *ImageAnnotatorCallOptions {
	return &ImageAnnotatorCallOptions{
	BatchAnnotateImages: []gax.CallOption{
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 60000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	BatchAnnotateFiles: []gax.CallOption{
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 60000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	AsyncBatchAnnotateImages: []gax.CallOption{
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 60000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	AsyncBatchAnnotateFiles: []gax.CallOption{
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.DeadlineExceeded,
	codes.Unavailable,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 60000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	}
	}

	// ImageAnnotatorClient is a client for interacting with Cloud Vision API.
	//
	// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
	type ImageAnnotatorClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// The gRPC API client.
	imageAnnotatorClient visionpb.ImageAnnotatorClient

	// LROClient is used internally to handle longrunning operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient

	// The call options for this service.
	CallOptions *ImageAnnotatorCallOptions

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
	}

	// NewImageAnnotatorClient creates a new image annotator client.
	//
	// Service that performs Google Cloud Vision API detection tasks over client
	// images, such as face, landmark, logo, label, and text detection. The
	// ImageAnnotator service returns detected entities from the images.
	func NewImageAnnotatorClient(ctx context.Context, opts ...option.ClientOption) (*ImageAnnotatorClient, error) {
	connPool, err := gtransport.DialPool(ctx, append(defaultImageAnnotatorClientOptions(), opts...)...)
	if err != nil {
	return nil, err
	}
	c := &ImageAnnotatorClient{
	connPool: connPool,
	CallOptions: defaultImageAnnotatorCallOptions(),

	imageAnnotatorClient: visionpb.NewImageAnnotatorClient(connPool),
	}
	c.setGoogleClientInfo()

	c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
	// This error "should not happen", since we are just reusing old connection pool
	// and never actually need to dial.
	// If this does happen, we could leak connp. However, we cannot close conn:
	// If the user invoked the constructor with option.WithGRPCConn,
	// we would close a connection that's still in use.
	// TODO: investigate error conditions.
	return nil, err
	}
	return c, nil
	}

	// Connection returns a connection to the API service.
	//
	// Deprecated.
	func (c ImageAnnotatorClient) Connection() grpc.ClientConn {
	return c.connPool.Conn()
	}

	// Close closes the connection to the API service. The user should invoke this when
	// the client is no longer required.
	func (c *ImageAnnotatorClient) Close() error {
	return c.connPool.Close()
	}

	// setGoogleClientInfo sets the name and version of the application in
	// the `x-goog-api-client` header passed on each request. Intended for
	// use by Google-written clients.
	func (c *ImageAnnotatorClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
	}

	// BatchAnnotateImages run image detection and annotation for a batch of images.
	func (c ImageAnnotatorClient) BatchAnnotateImages(ctx context.Context, req visionpb.BatchAnnotateImagesRequest, opts ...gax.CallOption) (*visionpb.BatchAnnotateImagesResponse, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.BatchAnnotateImages[0:len(c.CallOptions.BatchAnnotateImages):len(c.CallOptions.BatchAnnotateImages)], opts...)
	var resp *visionpb.BatchAnnotateImagesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.imageAnnotatorClient.BatchAnnotateImages(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// BatchAnnotateFiles service that performs image detection and annotation for a batch of files.
	// Now only “application/pdf”, “image/tiff” and “image/gif” are supported.
	//
	// This service will extract at most 5 (customers can specify which 5 in
	// AnnotateFileRequest.pages) frames (gif) or pages (pdf or tiff) from each
	// file provided and perform detection and annotation for each image
	// extracted.
	func (c ImageAnnotatorClient) BatchAnnotateFiles(ctx context.Context, req visionpb.BatchAnnotateFilesRequest, opts ...gax.CallOption) (*visionpb.BatchAnnotateFilesResponse, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.BatchAnnotateFiles[0:len(c.CallOptions.BatchAnnotateFiles):len(c.CallOptions.BatchAnnotateFiles)], opts...)
	var resp *visionpb.BatchAnnotateFilesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.imageAnnotatorClient.BatchAnnotateFiles(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	// AsyncBatchAnnotateImages run asynchronous image detection and annotation for a list of images.
	//
	// Progress and results can be retrieved through the
	// google.longrunning.Operations interface.
	// Operation.metadata contains OperationMetadata (metadata).
	// Operation.response contains AsyncBatchAnnotateImagesResponse (results).
	//
	// This service will write image annotation outputs to json files in customer
	// GCS bucket, each json file containing BatchAnnotateImagesResponse proto.
	func (c ImageAnnotatorClient) AsyncBatchAnnotateImages(ctx context.Context, req visionpb.AsyncBatchAnnotateImagesRequest, opts ...gax.CallOption) (*AsyncBatchAnnotateImagesOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.AsyncBatchAnnotateImages[0:len(c.CallOptions.AsyncBatchAnnotateImages):len(c.CallOptions.AsyncBatchAnnotateImages)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.imageAnnotatorClient.AsyncBatchAnnotateImages(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return &AsyncBatchAnnotateImagesOperation{
	lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
	}

	// AsyncBatchAnnotateFiles run asynchronous image detection and annotation for a list of generic
	// files, such as PDF files, which may contain multiple pages and multiple
	// images per page. Progress and results can be retrieved through the
	// google.longrunning.Operations interface.
	// Operation.metadata contains OperationMetadata (metadata).
	// Operation.response contains AsyncBatchAnnotateFilesResponse (results).
	func (c ImageAnnotatorClient) AsyncBatchAnnotateFiles(ctx context.Context, req visionpb.AsyncBatchAnnotateFilesRequest, opts ...gax.CallOption) (*AsyncBatchAnnotateFilesOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.AsyncBatchAnnotateFiles[0:len(c.CallOptions.AsyncBatchAnnotateFiles):len(c.CallOptions.AsyncBatchAnnotateFiles)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.imageAnnotatorClient.AsyncBatchAnnotateFiles(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return &AsyncBatchAnnotateFilesOperation{
	lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
	}

	// AsyncBatchAnnotateFilesOperation manages a long-running operation from AsyncBatchAnnotateFiles.
	type AsyncBatchAnnotateFilesOperation struct {
	lro *longrunning.Operation
	}

	// AsyncBatchAnnotateFilesOperation returns a new AsyncBatchAnnotateFilesOperation from a given name.
	// The name must be that of a previously created AsyncBatchAnnotateFilesOperation, possibly from a different process.
	func (c ImageAnnotatorClient) AsyncBatchAnnotateFilesOperation(name string) AsyncBatchAnnotateFilesOperation {
	return &AsyncBatchAnnotateFilesOperation{
	lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
	}

	// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
	//
	// See documentation of Poll for error-handling information.
	func (op AsyncBatchAnnotateFilesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (visionpb.AsyncBatchAnnotateFilesResponse, error) {
	var resp visionpb.AsyncBatchAnnotateFilesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
	return nil, err
	}
	return &resp, nil
	}

	// 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.
	func (op AsyncBatchAnnotateFilesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (visionpb.AsyncBatchAnnotateFilesResponse, error) {
	var resp visionpb.AsyncBatchAnnotateFilesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
	return nil, err
	}
	if !op.Done() {
	return nil, nil
	}
	return &resp, nil
	}

	// 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.
	func (op AsyncBatchAnnotateFilesOperation) Metadata() (visionpb.OperationMetadata, error) {
	var meta visionpb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
	return nil, nil
	} else if err != nil {
	return nil, err
	}
	return &meta, nil
	}

	// Done reports whether the long-running operation has completed.
	func (op *AsyncBatchAnnotateFilesOperation) Done() bool {
	return op.lro.Done()
	}

	// 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.
	func (op *AsyncBatchAnnotateFilesOperation) Name() string {
	return op.lro.Name()
	}

	// AsyncBatchAnnotateImagesOperation manages a long-running operation from AsyncBatchAnnotateImages.
	type AsyncBatchAnnotateImagesOperation struct {
	lro *longrunning.Operation
	}

	// AsyncBatchAnnotateImagesOperation returns a new AsyncBatchAnnotateImagesOperation from a given name.
	// The name must be that of a previously created AsyncBatchAnnotateImagesOperation, possibly from a different process.
	func (c ImageAnnotatorClient) AsyncBatchAnnotateImagesOperation(name string) AsyncBatchAnnotateImagesOperation {
	return &AsyncBatchAnnotateImagesOperation{
	lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
	}

	// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
	//
	// See documentation of Poll for error-handling information.
	func (op AsyncBatchAnnotateImagesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (visionpb.AsyncBatchAnnotateImagesResponse, error) {
	var resp visionpb.AsyncBatchAnnotateImagesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
	return nil, err
	}
	return &resp, nil
	}

	// 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.
	func (op AsyncBatchAnnotateImagesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (visionpb.AsyncBatchAnnotateImagesResponse, error) {
	var resp visionpb.AsyncBatchAnnotateImagesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
	return nil, err
	}
	if !op.Done() {
	return nil, nil
	}
	return &resp, nil
	}

	// 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.
	func (op AsyncBatchAnnotateImagesOperation) Metadata() (visionpb.OperationMetadata, error) {
	var meta visionpb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
	return nil, nil
	} else if err != nil {
	return nil, err
	}
	return &meta, nil
	}

	// Done reports whether the long-running operation has completed.
	func (op *AsyncBatchAnnotateImagesOperation) Done() bool {
	return op.lro.Done()
	}

	// 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.
	func (op *AsyncBatchAnnotateImagesOperation) Name() string {
	return op.lro.Name()
	}