// Copyright 2022 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 storage

import (
	"context"
	"math"

	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	iampb "google.golang.org/genproto/googleapis/iam/v1"
	storagepb "google.golang.org/genproto/googleapis/storage/v2"
	"google.golang.org/grpc"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/proto"
)

var newClientHook clientHook

// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
	DeleteBucket              []gax.CallOption
	GetBucket                 []gax.CallOption
	CreateBucket              []gax.CallOption
	ListBuckets               []gax.CallOption
	LockBucketRetentionPolicy []gax.CallOption
	GetIamPolicy              []gax.CallOption
	SetIamPolicy              []gax.CallOption
	TestIamPermissions        []gax.CallOption
	UpdateBucket              []gax.CallOption
	DeleteNotification        []gax.CallOption
	GetNotification           []gax.CallOption
	CreateNotification        []gax.CallOption
	ListNotifications         []gax.CallOption
	ComposeObject             []gax.CallOption
	DeleteObject              []gax.CallOption
	GetObject                 []gax.CallOption
	ReadObject                []gax.CallOption
	UpdateObject              []gax.CallOption
	WriteObject               []gax.CallOption
	ListObjects               []gax.CallOption
	RewriteObject             []gax.CallOption
	StartResumableWrite       []gax.CallOption
	QueryWriteStatus          []gax.CallOption
	GetServiceAccount         []gax.CallOption
	CreateHmacKey             []gax.CallOption
	DeleteHmacKey             []gax.CallOption
	GetHmacKey                []gax.CallOption
	ListHmacKeys              []gax.CallOption
	UpdateHmacKey             []gax.CallOption
}

func defaultGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("storage.googleapis.com:443"),
		internaloption.WithDefaultMTLSEndpoint("storage.mtls.googleapis.com:443"),
		internaloption.WithDefaultAudience("https://storage.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableJwtWithScope(),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultCallOptions() *CallOptions {
	return &CallOptions{
		DeleteBucket:              []gax.CallOption{},
		GetBucket:                 []gax.CallOption{},
		CreateBucket:              []gax.CallOption{},
		ListBuckets:               []gax.CallOption{},
		LockBucketRetentionPolicy: []gax.CallOption{},
		GetIamPolicy:              []gax.CallOption{},
		SetIamPolicy:              []gax.CallOption{},
		TestIamPermissions:        []gax.CallOption{},
		UpdateBucket:              []gax.CallOption{},
		DeleteNotification:        []gax.CallOption{},
		GetNotification:           []gax.CallOption{},
		CreateNotification:        []gax.CallOption{},
		ListNotifications:         []gax.CallOption{},
		ComposeObject:             []gax.CallOption{},
		DeleteObject:              []gax.CallOption{},
		GetObject:                 []gax.CallOption{},
		ReadObject:                []gax.CallOption{},
		UpdateObject:              []gax.CallOption{},
		WriteObject:               []gax.CallOption{},
		ListObjects:               []gax.CallOption{},
		RewriteObject:             []gax.CallOption{},
		StartResumableWrite:       []gax.CallOption{},
		QueryWriteStatus:          []gax.CallOption{},
		GetServiceAccount:         []gax.CallOption{},
		CreateHmacKey:             []gax.CallOption{},
		DeleteHmacKey:             []gax.CallOption{},
		GetHmacKey:                []gax.CallOption{},
		ListHmacKeys:              []gax.CallOption{},
		UpdateHmacKey:             []gax.CallOption{},
	}
}

// internalClient is an interface that defines the methods availaible from Cloud Storage API.
type internalClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	DeleteBucket(context.Context, *storagepb.DeleteBucketRequest, ...gax.CallOption) error
	GetBucket(context.Context, *storagepb.GetBucketRequest, ...gax.CallOption) (*storagepb.Bucket, error)
	CreateBucket(context.Context, *storagepb.CreateBucketRequest, ...gax.CallOption) (*storagepb.Bucket, error)
	ListBuckets(context.Context, *storagepb.ListBucketsRequest, ...gax.CallOption) *BucketIterator
	LockBucketRetentionPolicy(context.Context, *storagepb.LockBucketRetentionPolicyRequest, ...gax.CallOption) (*storagepb.Bucket, error)
	GetIamPolicy(context.Context, *iampb.GetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	SetIamPolicy(context.Context, *iampb.SetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	TestIamPermissions(context.Context, *iampb.TestIamPermissionsRequest, ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error)
	UpdateBucket(context.Context, *storagepb.UpdateBucketRequest, ...gax.CallOption) (*storagepb.Bucket, error)
	DeleteNotification(context.Context, *storagepb.DeleteNotificationRequest, ...gax.CallOption) error
	GetNotification(context.Context, *storagepb.GetNotificationRequest, ...gax.CallOption) (*storagepb.Notification, error)
	CreateNotification(context.Context, *storagepb.CreateNotificationRequest, ...gax.CallOption) (*storagepb.Notification, error)
	ListNotifications(context.Context, *storagepb.ListNotificationsRequest, ...gax.CallOption) *NotificationIterator
	ComposeObject(context.Context, *storagepb.ComposeObjectRequest, ...gax.CallOption) (*storagepb.Object, error)
	DeleteObject(context.Context, *storagepb.DeleteObjectRequest, ...gax.CallOption) error
	GetObject(context.Context, *storagepb.GetObjectRequest, ...gax.CallOption) (*storagepb.Object, error)
	ReadObject(context.Context, *storagepb.ReadObjectRequest, ...gax.CallOption) (storagepb.Storage_ReadObjectClient, error)
	UpdateObject(context.Context, *storagepb.UpdateObjectRequest, ...gax.CallOption) (*storagepb.Object, error)
	WriteObject(context.Context, ...gax.CallOption) (storagepb.Storage_WriteObjectClient, error)
	ListObjects(context.Context, *storagepb.ListObjectsRequest, ...gax.CallOption) *ObjectIterator
	RewriteObject(context.Context, *storagepb.RewriteObjectRequest, ...gax.CallOption) (*storagepb.RewriteResponse, error)
	StartResumableWrite(context.Context, *storagepb.StartResumableWriteRequest, ...gax.CallOption) (*storagepb.StartResumableWriteResponse, error)
	QueryWriteStatus(context.Context, *storagepb.QueryWriteStatusRequest, ...gax.CallOption) (*storagepb.QueryWriteStatusResponse, error)
	GetServiceAccount(context.Context, *storagepb.GetServiceAccountRequest, ...gax.CallOption) (*storagepb.ServiceAccount, error)
	CreateHmacKey(context.Context, *storagepb.CreateHmacKeyRequest, ...gax.CallOption) (*storagepb.CreateHmacKeyResponse, error)
	DeleteHmacKey(context.Context, *storagepb.DeleteHmacKeyRequest, ...gax.CallOption) error
	GetHmacKey(context.Context, *storagepb.GetHmacKeyRequest, ...gax.CallOption) (*storagepb.HmacKeyMetadata, error)
	ListHmacKeys(context.Context, *storagepb.ListHmacKeysRequest, ...gax.CallOption) *HmacKeyMetadataIterator
	UpdateHmacKey(context.Context, *storagepb.UpdateHmacKeyRequest, ...gax.CallOption) (*storagepb.HmacKeyMetadata, error)
}

// Client is a client for interacting with Cloud Storage API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// API Overview and Naming SyntaxThe Cloud Storage gRPC API allows applications to read and write data through
// the abstractions of buckets and objects. For a description of these
// abstractions please see https://cloud.google.com/storage/docs (at https://cloud.google.com/storage/docs).
//
// Resources are named as follows:
//
//   Projects are referred to as they are defined by the Resource Manager API,
//   using strings like projects/123456 or projects/my-string-id.
//
//   Buckets are named using string names of the form:
//   projects/{project}/buckets/{bucket}
//   For globally unique buckets, _ may be substituted for the project.
//
//   Objects are uniquely identified by their name along with the name of the
//   bucket they belong to, as separate strings in this API. For example:
//
// ReadObjectRequest {
//   bucket: ‘projects/_/buckets/my-bucket’
//   object: ‘my-object’
//   }
//   Note that object names can contain / characters, which are treated as
//   any other character (no special directory semantics).
type Client struct {
	// The internal transport-dependent client.
	internalClient internalClient

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

// Wrapper methods routed to the internal client.

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

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

// DeleteBucket permanently deletes an empty bucket.
func (c *Client) DeleteBucket(ctx context.Context, req *storagepb.DeleteBucketRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteBucket(ctx, req, opts...)
}

// GetBucket returns metadata for the specified bucket.
func (c *Client) GetBucket(ctx context.Context, req *storagepb.GetBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	return c.internalClient.GetBucket(ctx, req, opts...)
}

// CreateBucket creates a new bucket.
func (c *Client) CreateBucket(ctx context.Context, req *storagepb.CreateBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	return c.internalClient.CreateBucket(ctx, req, opts...)
}

// ListBuckets retrieves a list of buckets for a given project.
func (c *Client) ListBuckets(ctx context.Context, req *storagepb.ListBucketsRequest, opts ...gax.CallOption) *BucketIterator {
	return c.internalClient.ListBuckets(ctx, req, opts...)
}

// LockBucketRetentionPolicy locks retention policy on a bucket.
func (c *Client) LockBucketRetentionPolicy(ctx context.Context, req *storagepb.LockBucketRetentionPolicyRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	return c.internalClient.LockBucketRetentionPolicy(ctx, req, opts...)
}

// GetIamPolicy gets the IAM policy for a specified bucket.
func (c *Client) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.GetIamPolicy(ctx, req, opts...)
}

// SetIamPolicy updates an IAM policy for the specified bucket.
func (c *Client) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.SetIamPolicy(ctx, req, opts...)
}

// TestIamPermissions tests a set of permissions on the given bucket to see which, if
// any, are held by the caller.
func (c *Client) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	return c.internalClient.TestIamPermissions(ctx, req, opts...)
}

// UpdateBucket updates a bucket. Equivalent to JSON API’s storage.buckets.patch method.
func (c *Client) UpdateBucket(ctx context.Context, req *storagepb.UpdateBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	return c.internalClient.UpdateBucket(ctx, req, opts...)
}

// DeleteNotification permanently deletes a notification subscription.
func (c *Client) DeleteNotification(ctx context.Context, req *storagepb.DeleteNotificationRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteNotification(ctx, req, opts...)
}

// GetNotification view a notification config.
func (c *Client) GetNotification(ctx context.Context, req *storagepb.GetNotificationRequest, opts ...gax.CallOption) (*storagepb.Notification, error) {
	return c.internalClient.GetNotification(ctx, req, opts...)
}

// CreateNotification creates a notification subscription for a given bucket.
// These notifications, when triggered, publish messages to the specified
// Pub/Sub topics.
// See https://cloud.google.com/storage/docs/pubsub-notifications (at https://cloud.google.com/storage/docs/pubsub-notifications).
func (c *Client) CreateNotification(ctx context.Context, req *storagepb.CreateNotificationRequest, opts ...gax.CallOption) (*storagepb.Notification, error) {
	return c.internalClient.CreateNotification(ctx, req, opts...)
}

// ListNotifications retrieves a list of notification subscriptions for a given bucket.
func (c *Client) ListNotifications(ctx context.Context, req *storagepb.ListNotificationsRequest, opts ...gax.CallOption) *NotificationIterator {
	return c.internalClient.ListNotifications(ctx, req, opts...)
}

// ComposeObject concatenates a list of existing objects into a new object in the same
// bucket.
func (c *Client) ComposeObject(ctx context.Context, req *storagepb.ComposeObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	return c.internalClient.ComposeObject(ctx, req, opts...)
}

// DeleteObject deletes an object and its metadata. Deletions are permanent if versioning
// is not enabled for the bucket, or if the generation parameter
// is used.
func (c *Client) DeleteObject(ctx context.Context, req *storagepb.DeleteObjectRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteObject(ctx, req, opts...)
}

// GetObject retrieves an object’s metadata.
func (c *Client) GetObject(ctx context.Context, req *storagepb.GetObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	return c.internalClient.GetObject(ctx, req, opts...)
}

// ReadObject reads an object’s data.
func (c *Client) ReadObject(ctx context.Context, req *storagepb.ReadObjectRequest, opts ...gax.CallOption) (storagepb.Storage_ReadObjectClient, error) {
	return c.internalClient.ReadObject(ctx, req, opts...)
}

// UpdateObject updates an object’s metadata.
// Equivalent to JSON API’s storage.objects.patch.
func (c *Client) UpdateObject(ctx context.Context, req *storagepb.UpdateObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	return c.internalClient.UpdateObject(ctx, req, opts...)
}

// WriteObject stores a new object and metadata.
//
// An object can be written either in a single message stream or in a
// resumable sequence of message streams. To write using a single stream,
// the client should include in the first message of the stream an
// WriteObjectSpec describing the destination bucket, object, and any
// preconditions. Additionally, the final message must set ‘finish_write’ to
// true, or else it is an error.
//
// For a resumable write, the client should instead call
// StartResumableWrite() and provide that method an WriteObjectSpec.
// They should then attach the returned upload_id to the first message of
// each following call to Create. If there is an error or the connection is
// broken during the resumable Create(), the client should check the status
// of the Create() by calling QueryWriteStatus() and continue writing from
// the returned persisted_size. This may be less than the amount of data the
// client previously sent.
//
// The service will not view the object as complete until the client has
// sent a WriteObjectRequest with finish_write set to true. Sending any
// requests on a stream after sending a request with finish_write set to
// true will cause an error. The client should check the response it
// receives to determine how much data the service was able to commit and
// whether the service views the object as complete.
func (c *Client) WriteObject(ctx context.Context, opts ...gax.CallOption) (storagepb.Storage_WriteObjectClient, error) {
	return c.internalClient.WriteObject(ctx, opts...)
}

// ListObjects retrieves a list of objects matching the criteria.
func (c *Client) ListObjects(ctx context.Context, req *storagepb.ListObjectsRequest, opts ...gax.CallOption) *ObjectIterator {
	return c.internalClient.ListObjects(ctx, req, opts...)
}

// RewriteObject rewrites a source object to a destination object. Optionally overrides
// metadata.
func (c *Client) RewriteObject(ctx context.Context, req *storagepb.RewriteObjectRequest, opts ...gax.CallOption) (*storagepb.RewriteResponse, error) {
	return c.internalClient.RewriteObject(ctx, req, opts...)
}

// StartResumableWrite starts a resumable write. How long the write operation remains valid, and
// what happens when the write operation becomes invalid, are
// service-dependent.
func (c *Client) StartResumableWrite(ctx context.Context, req *storagepb.StartResumableWriteRequest, opts ...gax.CallOption) (*storagepb.StartResumableWriteResponse, error) {
	return c.internalClient.StartResumableWrite(ctx, req, opts...)
}

// QueryWriteStatus determines the persisted_size for an object that is being written, which
// can then be used as the write_offset for the next Write() call.
//
// If the object does not exist (i.e., the object has been deleted, or the
// first Write() has not yet reached the service), this method returns the
// error NOT_FOUND.
//
// The client may call QueryWriteStatus() at any time to determine how
// much data has been processed for this object. This is useful if the
// client is buffering data and needs to know which data can be safely
// evicted. For any sequence of QueryWriteStatus() calls for a given
// object name, the sequence of returned persisted_size values will be
// non-decreasing.
func (c *Client) QueryWriteStatus(ctx context.Context, req *storagepb.QueryWriteStatusRequest, opts ...gax.CallOption) (*storagepb.QueryWriteStatusResponse, error) {
	return c.internalClient.QueryWriteStatus(ctx, req, opts...)
}

// GetServiceAccount retrieves the name of a project’s Google Cloud Storage service account.
func (c *Client) GetServiceAccount(ctx context.Context, req *storagepb.GetServiceAccountRequest, opts ...gax.CallOption) (*storagepb.ServiceAccount, error) {
	return c.internalClient.GetServiceAccount(ctx, req, opts...)
}

// CreateHmacKey creates a new HMAC key for the given service account.
func (c *Client) CreateHmacKey(ctx context.Context, req *storagepb.CreateHmacKeyRequest, opts ...gax.CallOption) (*storagepb.CreateHmacKeyResponse, error) {
	return c.internalClient.CreateHmacKey(ctx, req, opts...)
}

// DeleteHmacKey deletes a given HMAC key.  Key must be in an INACTIVE state.
func (c *Client) DeleteHmacKey(ctx context.Context, req *storagepb.DeleteHmacKeyRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteHmacKey(ctx, req, opts...)
}

// GetHmacKey gets an existing HMAC key metadata for the given id.
func (c *Client) GetHmacKey(ctx context.Context, req *storagepb.GetHmacKeyRequest, opts ...gax.CallOption) (*storagepb.HmacKeyMetadata, error) {
	return c.internalClient.GetHmacKey(ctx, req, opts...)
}

// ListHmacKeys lists HMAC keys under a given project with the additional filters provided.
func (c *Client) ListHmacKeys(ctx context.Context, req *storagepb.ListHmacKeysRequest, opts ...gax.CallOption) *HmacKeyMetadataIterator {
	return c.internalClient.ListHmacKeys(ctx, req, opts...)
}

// UpdateHmacKey updates a given HMAC key state between ACTIVE and INACTIVE.
func (c *Client) UpdateHmacKey(ctx context.Context, req *storagepb.UpdateHmacKeyRequest, opts ...gax.CallOption) (*storagepb.HmacKeyMetadata, error) {
	return c.internalClient.UpdateHmacKey(ctx, req, opts...)
}

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

	// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
	disableDeadlines bool

	// Points back to the CallOptions field of the containing Client
	CallOptions **CallOptions

	// The gRPC API client.
	client storagepb.StorageClient

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

// NewClient creates a new storage client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// API Overview and Naming SyntaxThe Cloud Storage gRPC API allows applications to read and write data through
// the abstractions of buckets and objects. For a description of these
// abstractions please see https://cloud.google.com/storage/docs (at https://cloud.google.com/storage/docs).
//
// Resources are named as follows:
//
//   Projects are referred to as they are defined by the Resource Manager API,
//   using strings like projects/123456 or projects/my-string-id.
//
//   Buckets are named using string names of the form:
//   projects/{project}/buckets/{bucket}
//   For globally unique buckets, _ may be substituted for the project.
//
//   Objects are uniquely identified by their name along with the name of the
//   bucket they belong to, as separate strings in this API. For example:
//
// ReadObjectRequest {
//   bucket: ‘projects/_/buckets/my-bucket’
//   object: ‘my-object’
//   }
//   Note that object names can contain / characters, which are treated as
//   any other character (no special directory semantics).
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	clientOpts := defaultGRPCClientOptions()
	if newClientHook != nil {
		hookOpts, err := newClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	disableDeadlines, err := checkDisableDeadlines()
	if err != nil {
		return nil, err
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := Client{CallOptions: defaultCallOptions()}

	c := &gRPCClient{
		connPool:         connPool,
		disableDeadlines: disableDeadlines,
		client:           storagepb.NewStorageClient(connPool),
		CallOptions:      &client.CallOptions,
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	return &client, nil
}

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

// 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 *gRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

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

func (c *gRPCClient) DeleteBucket(ctx context.Context, req *storagepb.DeleteBucketRequest, opts ...gax.CallOption) error {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).DeleteBucket[0:len((*c.CallOptions).DeleteBucket):len((*c.CallOptions).DeleteBucket)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteBucket(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *gRPCClient) GetBucket(ctx context.Context, req *storagepb.GetBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetBucket[0:len((*c.CallOptions).GetBucket):len((*c.CallOptions).GetBucket)], opts...)
	var resp *storagepb.Bucket
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetBucket(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) CreateBucket(ctx context.Context, req *storagepb.CreateBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).CreateBucket[0:len((*c.CallOptions).CreateBucket):len((*c.CallOptions).CreateBucket)], opts...)
	var resp *storagepb.Bucket
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateBucket(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) ListBuckets(ctx context.Context, req *storagepb.ListBucketsRequest, opts ...gax.CallOption) *BucketIterator {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).ListBuckets[0:len((*c.CallOptions).ListBuckets):len((*c.CallOptions).ListBuckets)], opts...)
	it := &BucketIterator{}
	req = proto.Clone(req).(*storagepb.ListBucketsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*storagepb.Bucket, string, error) {
		resp := &storagepb.ListBucketsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListBuckets(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetBuckets(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *gRPCClient) LockBucketRetentionPolicy(ctx context.Context, req *storagepb.LockBucketRetentionPolicyRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).LockBucketRetentionPolicy[0:len((*c.CallOptions).LockBucketRetentionPolicy):len((*c.CallOptions).LockBucketRetentionPolicy)], opts...)
	var resp *storagepb.Bucket
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.LockBucketRetentionPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetIamPolicy[0:len((*c.CallOptions).GetIamPolicy):len((*c.CallOptions).GetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).SetIamPolicy[0:len((*c.CallOptions).SetIamPolicy):len((*c.CallOptions).SetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.SetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).TestIamPermissions[0:len((*c.CallOptions).TestIamPermissions):len((*c.CallOptions).TestIamPermissions)], opts...)
	var resp *iampb.TestIamPermissionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.TestIamPermissions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) UpdateBucket(ctx context.Context, req *storagepb.UpdateBucketRequest, opts ...gax.CallOption) (*storagepb.Bucket, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).UpdateBucket[0:len((*c.CallOptions).UpdateBucket):len((*c.CallOptions).UpdateBucket)], opts...)
	var resp *storagepb.Bucket
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateBucket(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) DeleteNotification(ctx context.Context, req *storagepb.DeleteNotificationRequest, opts ...gax.CallOption) error {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).DeleteNotification[0:len((*c.CallOptions).DeleteNotification):len((*c.CallOptions).DeleteNotification)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteNotification(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *gRPCClient) GetNotification(ctx context.Context, req *storagepb.GetNotificationRequest, opts ...gax.CallOption) (*storagepb.Notification, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetNotification[0:len((*c.CallOptions).GetNotification):len((*c.CallOptions).GetNotification)], opts...)
	var resp *storagepb.Notification
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetNotification(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) CreateNotification(ctx context.Context, req *storagepb.CreateNotificationRequest, opts ...gax.CallOption) (*storagepb.Notification, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).CreateNotification[0:len((*c.CallOptions).CreateNotification):len((*c.CallOptions).CreateNotification)], opts...)
	var resp *storagepb.Notification
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateNotification(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) ListNotifications(ctx context.Context, req *storagepb.ListNotificationsRequest, opts ...gax.CallOption) *NotificationIterator {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).ListNotifications[0:len((*c.CallOptions).ListNotifications):len((*c.CallOptions).ListNotifications)], opts...)
	it := &NotificationIterator{}
	req = proto.Clone(req).(*storagepb.ListNotificationsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*storagepb.Notification, string, error) {
		resp := &storagepb.ListNotificationsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListNotifications(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetNotifications(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *gRPCClient) ComposeObject(ctx context.Context, req *storagepb.ComposeObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).ComposeObject[0:len((*c.CallOptions).ComposeObject):len((*c.CallOptions).ComposeObject)], opts...)
	var resp *storagepb.Object
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.ComposeObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) DeleteObject(ctx context.Context, req *storagepb.DeleteObjectRequest, opts ...gax.CallOption) error {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).DeleteObject[0:len((*c.CallOptions).DeleteObject):len((*c.CallOptions).DeleteObject)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *gRPCClient) GetObject(ctx context.Context, req *storagepb.GetObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetObject[0:len((*c.CallOptions).GetObject):len((*c.CallOptions).GetObject)], opts...)
	var resp *storagepb.Object
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) ReadObject(ctx context.Context, req *storagepb.ReadObjectRequest, opts ...gax.CallOption) (storagepb.Storage_ReadObjectClient, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	var resp storagepb.Storage_ReadObjectClient
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.ReadObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) UpdateObject(ctx context.Context, req *storagepb.UpdateObjectRequest, opts ...gax.CallOption) (*storagepb.Object, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).UpdateObject[0:len((*c.CallOptions).UpdateObject):len((*c.CallOptions).UpdateObject)], opts...)
	var resp *storagepb.Object
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) WriteObject(ctx context.Context, opts ...gax.CallOption) (storagepb.Storage_WriteObjectClient, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	var resp storagepb.Storage_WriteObjectClient
	opts = append((*c.CallOptions).WriteObject[0:len((*c.CallOptions).WriteObject):len((*c.CallOptions).WriteObject)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.WriteObject(ctx, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) ListObjects(ctx context.Context, req *storagepb.ListObjectsRequest, opts ...gax.CallOption) *ObjectIterator {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).ListObjects[0:len((*c.CallOptions).ListObjects):len((*c.CallOptions).ListObjects)], opts...)
	it := &ObjectIterator{}
	req = proto.Clone(req).(*storagepb.ListObjectsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*storagepb.Object, string, error) {
		resp := &storagepb.ListObjectsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListObjects(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetObjects(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *gRPCClient) RewriteObject(ctx context.Context, req *storagepb.RewriteObjectRequest, opts ...gax.CallOption) (*storagepb.RewriteResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).RewriteObject[0:len((*c.CallOptions).RewriteObject):len((*c.CallOptions).RewriteObject)], opts...)
	var resp *storagepb.RewriteResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.RewriteObject(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) StartResumableWrite(ctx context.Context, req *storagepb.StartResumableWriteRequest, opts ...gax.CallOption) (*storagepb.StartResumableWriteResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).StartResumableWrite[0:len((*c.CallOptions).StartResumableWrite):len((*c.CallOptions).StartResumableWrite)], opts...)
	var resp *storagepb.StartResumableWriteResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.StartResumableWrite(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) QueryWriteStatus(ctx context.Context, req *storagepb.QueryWriteStatusRequest, opts ...gax.CallOption) (*storagepb.QueryWriteStatusResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).QueryWriteStatus[0:len((*c.CallOptions).QueryWriteStatus):len((*c.CallOptions).QueryWriteStatus)], opts...)
	var resp *storagepb.QueryWriteStatusResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.QueryWriteStatus(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) GetServiceAccount(ctx context.Context, req *storagepb.GetServiceAccountRequest, opts ...gax.CallOption) (*storagepb.ServiceAccount, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetServiceAccount[0:len((*c.CallOptions).GetServiceAccount):len((*c.CallOptions).GetServiceAccount)], opts...)
	var resp *storagepb.ServiceAccount
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetServiceAccount(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) CreateHmacKey(ctx context.Context, req *storagepb.CreateHmacKeyRequest, opts ...gax.CallOption) (*storagepb.CreateHmacKeyResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).CreateHmacKey[0:len((*c.CallOptions).CreateHmacKey):len((*c.CallOptions).CreateHmacKey)], opts...)
	var resp *storagepb.CreateHmacKeyResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.CreateHmacKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) DeleteHmacKey(ctx context.Context, req *storagepb.DeleteHmacKeyRequest, opts ...gax.CallOption) error {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).DeleteHmacKey[0:len((*c.CallOptions).DeleteHmacKey):len((*c.CallOptions).DeleteHmacKey)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.client.DeleteHmacKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *gRPCClient) GetHmacKey(ctx context.Context, req *storagepb.GetHmacKeyRequest, opts ...gax.CallOption) (*storagepb.HmacKeyMetadata, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).GetHmacKey[0:len((*c.CallOptions).GetHmacKey):len((*c.CallOptions).GetHmacKey)], opts...)
	var resp *storagepb.HmacKeyMetadata
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.GetHmacKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *gRPCClient) ListHmacKeys(ctx context.Context, req *storagepb.ListHmacKeysRequest, opts ...gax.CallOption) *HmacKeyMetadataIterator {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).ListHmacKeys[0:len((*c.CallOptions).ListHmacKeys):len((*c.CallOptions).ListHmacKeys)], opts...)
	it := &HmacKeyMetadataIterator{}
	req = proto.Clone(req).(*storagepb.ListHmacKeysRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*storagepb.HmacKeyMetadata, string, error) {
		resp := &storagepb.ListHmacKeysResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.client.ListHmacKeys(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetHmacKeys(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *gRPCClient) UpdateHmacKey(ctx context.Context, req *storagepb.UpdateHmacKeyRequest, opts ...gax.CallOption) (*storagepb.HmacKeyMetadata, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append((*c.CallOptions).UpdateHmacKey[0:len((*c.CallOptions).UpdateHmacKey):len((*c.CallOptions).UpdateHmacKey)], opts...)
	var resp *storagepb.HmacKeyMetadata
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.UpdateHmacKey(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// BucketIterator manages a stream of *storagepb.Bucket.
type BucketIterator struct {
	items    []*storagepb.Bucket
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*storagepb.Bucket, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *BucketIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// 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.
func (it *BucketIterator) Next() (*storagepb.Bucket, error) {
	var item *storagepb.Bucket
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *BucketIterator) bufLen() int {
	return len(it.items)
}

func (it *BucketIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// HmacKeyMetadataIterator manages a stream of *storagepb.HmacKeyMetadata.
type HmacKeyMetadataIterator struct {
	items    []*storagepb.HmacKeyMetadata
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*storagepb.HmacKeyMetadata, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *HmacKeyMetadataIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// 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.
func (it *HmacKeyMetadataIterator) Next() (*storagepb.HmacKeyMetadata, error) {
	var item *storagepb.HmacKeyMetadata
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *HmacKeyMetadataIterator) bufLen() int {
	return len(it.items)
}

func (it *HmacKeyMetadataIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// NotificationIterator manages a stream of *storagepb.Notification.
type NotificationIterator struct {
	items    []*storagepb.Notification
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*storagepb.Notification, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *NotificationIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// 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.
func (it *NotificationIterator) Next() (*storagepb.Notification, error) {
	var item *storagepb.Notification
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *NotificationIterator) bufLen() int {
	return len(it.items)
}

func (it *NotificationIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// ObjectIterator manages a stream of *storagepb.Object.
type ObjectIterator struct {
	items    []*storagepb.Object
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*storagepb.Object, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *ObjectIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// 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.
func (it *ObjectIterator) Next() (*storagepb.Object, error) {
	var item *storagepb.Object
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *ObjectIterator) bufLen() int {
	return len(it.items)
}

func (it *ObjectIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}
