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subscriber_client.go
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subscriber_client.go
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// Copyright 2018 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.
// AUTO-GENERATED CODE. DO NOT EDIT.
package pubsub
import (
"math"
"time"
"cloud.google.com/go/iam"
"cloud.google.com/go/internal/version"
gax "github.com/googleapis/gax-go"
"golang.org/x/net/context"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
"google.golang.org/api/transport"
pubsubpb "google.golang.org/genproto/googleapis/pubsub/v1"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
)
// SubscriberCallOptions contains the retry settings for each method of SubscriberClient.
type SubscriberCallOptions struct {
CreateSubscription []gax.CallOption
GetSubscription []gax.CallOption
UpdateSubscription []gax.CallOption
ListSubscriptions []gax.CallOption
DeleteSubscription []gax.CallOption
ModifyAckDeadline []gax.CallOption
Acknowledge []gax.CallOption
Pull []gax.CallOption
StreamingPull []gax.CallOption
ModifyPushConfig []gax.CallOption
ListSnapshots []gax.CallOption
CreateSnapshot []gax.CallOption
UpdateSnapshot []gax.CallOption
DeleteSnapshot []gax.CallOption
Seek []gax.CallOption
}
func defaultSubscriberClientOptions() []option.ClientOption {
return []option.ClientOption{
option.WithEndpoint("pubsub.googleapis.com:443"),
option.WithScopes(DefaultAuthScopes()...),
}
}
func defaultSubscriberCallOptions() *SubscriberCallOptions {
retry := map[[2]string][]gax.CallOption{
{"default", "idempotent"}: {
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: 1.3,
})
}),
},
{"messaging", "pull"}: {
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.Canceled,
codes.DeadlineExceeded,
codes.Internal,
codes.ResourceExhausted,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.3,
})
}),
},
{"streaming_messaging", "pull"}: {
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.Canceled,
codes.DeadlineExceeded,
codes.Internal,
codes.ResourceExhausted,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.3,
})
}),
},
}
return &SubscriberCallOptions{
CreateSubscription: retry[[2]string{"default", "idempotent"}],
GetSubscription: retry[[2]string{"default", "idempotent"}],
UpdateSubscription: retry[[2]string{"default", "idempotent"}],
ListSubscriptions: retry[[2]string{"default", "idempotent"}],
DeleteSubscription: retry[[2]string{"default", "idempotent"}],
ModifyAckDeadline: retry[[2]string{"default", "non_idempotent"}],
Acknowledge: retry[[2]string{"messaging", "non_idempotent"}],
Pull: retry[[2]string{"messaging", "pull"}],
StreamingPull: retry[[2]string{"streaming_messaging", "pull"}],
ModifyPushConfig: retry[[2]string{"default", "non_idempotent"}],
ListSnapshots: retry[[2]string{"default", "idempotent"}],
CreateSnapshot: retry[[2]string{"default", "idempotent"}],
UpdateSnapshot: retry[[2]string{"default", "idempotent"}],
DeleteSnapshot: retry[[2]string{"default", "idempotent"}],
Seek: retry[[2]string{"default", "non_idempotent"}],
}
}
// SubscriberClient is a client for interacting with Google Cloud Pub/Sub API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type SubscriberClient struct {
// The connection to the service.
conn *grpc.ClientConn
// The gRPC API client.
subscriberClient pubsubpb.SubscriberClient
// The call options for this service.
CallOptions *SubscriberCallOptions
// The x-goog-* metadata to be sent with each request.
xGoogMetadata metadata.MD
}
// NewSubscriberClient creates a new subscriber client.
//
// The service that an application uses to manipulate subscriptions and to
// consume messages from a subscription via the Pull method.
func NewSubscriberClient(ctx context.Context, opts ...option.ClientOption) (*SubscriberClient, error) {
conn, err := transport.DialGRPC(ctx, append(defaultSubscriberClientOptions(), opts...)...)
if err != nil {
return nil, err
}
c := &SubscriberClient{
conn: conn,
CallOptions: defaultSubscriberCallOptions(),
subscriberClient: pubsubpb.NewSubscriberClient(conn),
}
c.SetGoogleClientInfo()
return c, nil
}
// Connection returns the client's connection to the API service.
func (c *SubscriberClient) Connection() *grpc.ClientConn {
return c.conn
}
// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *SubscriberClient) Close() error {
return c.conn.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 *SubscriberClient) SetGoogleClientInfo(keyval ...string) {
kv := append([]string{"gl-go", version.Go()}, keyval...)
kv = append(kv, "gapic", version.Repo, "gax", gax.Version, "grpc", grpc.Version)
c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}
func (c *SubscriberClient) SubscriptionIAM(subscription *pubsubpb.Subscription) *iam.Handle {
return iam.InternalNewHandle(c.Connection(), subscription.Name)
}
func (c *SubscriberClient) TopicIAM(topic *pubsubpb.Topic) *iam.Handle {
return iam.InternalNewHandle(c.Connection(), topic.Name)
}
// CreateSubscription creates a subscription to a given topic.
// If the subscription already exists, returns ALREADY_EXISTS.
// If the corresponding topic doesn't exist, returns NOT_FOUND.
//
// If the name is not provided in the request, the server will assign a random
// name for this subscription on the same project as the topic, conforming
// to the
// resource name format (at https://cloud.google.com/pubsub/docs/overview#names).
// The generated name is populated in the returned Subscription object.
// Note that for REST API requests, you must specify a name in the request.
func (c *SubscriberClient) CreateSubscription(ctx context.Context, req *pubsubpb.Subscription, opts ...gax.CallOption) (*pubsubpb.Subscription, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.CreateSubscription[0:len(c.CallOptions.CreateSubscription):len(c.CallOptions.CreateSubscription)], opts...)
var resp *pubsubpb.Subscription
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.CreateSubscription(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// GetSubscription gets the configuration details of a subscription.
func (c *SubscriberClient) GetSubscription(ctx context.Context, req *pubsubpb.GetSubscriptionRequest, opts ...gax.CallOption) (*pubsubpb.Subscription, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.GetSubscription[0:len(c.CallOptions.GetSubscription):len(c.CallOptions.GetSubscription)], opts...)
var resp *pubsubpb.Subscription
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.GetSubscription(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// UpdateSubscription updates an existing subscription. Note that certain properties of a
// subscription, such as its topic, are not modifiable.
// NOTE: The style guide requires body: "subscription" instead of body: "*".
// Keeping the latter for internal consistency in V1, however it should be
// corrected in V2. See
// https://cloud.google.com/apis/design/standard_methods#update for details.
func (c *SubscriberClient) UpdateSubscription(ctx context.Context, req *pubsubpb.UpdateSubscriptionRequest, opts ...gax.CallOption) (*pubsubpb.Subscription, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.UpdateSubscription[0:len(c.CallOptions.UpdateSubscription):len(c.CallOptions.UpdateSubscription)], opts...)
var resp *pubsubpb.Subscription
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.UpdateSubscription(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// ListSubscriptions lists matching subscriptions.
func (c *SubscriberClient) ListSubscriptions(ctx context.Context, req *pubsubpb.ListSubscriptionsRequest, opts ...gax.CallOption) *SubscriptionIterator {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.ListSubscriptions[0:len(c.CallOptions.ListSubscriptions):len(c.CallOptions.ListSubscriptions)], opts...)
it := &SubscriptionIterator{}
it.InternalFetch = func(pageSize int, pageToken string) ([]*pubsubpb.Subscription, string, error) {
var resp *pubsubpb.ListSubscriptionsResponse
req.PageToken = pageToken
if pageSize > math.MaxInt32 {
req.PageSize = math.MaxInt32
} else {
req.PageSize = int32(pageSize)
}
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.ListSubscriptions(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, "", err
}
return resp.Subscriptions, resp.NextPageToken, 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)
return it
}
// DeleteSubscription deletes an existing subscription. All messages retained in the subscription
// are immediately dropped. Calls to Pull after deletion will return
// NOT_FOUND. After a subscription is deleted, a new one may be created with
// the same name, but the new one has no association with the old
// subscription or its topic unless the same topic is specified.
func (c *SubscriberClient) DeleteSubscription(ctx context.Context, req *pubsubpb.DeleteSubscriptionRequest, opts ...gax.CallOption) error {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.DeleteSubscription[0:len(c.CallOptions.DeleteSubscription):len(c.CallOptions.DeleteSubscription)], opts...)
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
_, err = c.subscriberClient.DeleteSubscription(ctx, req, settings.GRPC...)
return err
}, opts...)
return err
}
// ModifyAckDeadline modifies the ack deadline for a specific message. This method is useful
// to indicate that more time is needed to process a message by the
// subscriber, or to make the message available for redelivery if the
// processing was interrupted. Note that this does not modify the
// subscription-level ackDeadlineSeconds used for subsequent messages.
func (c *SubscriberClient) ModifyAckDeadline(ctx context.Context, req *pubsubpb.ModifyAckDeadlineRequest, opts ...gax.CallOption) error {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.ModifyAckDeadline[0:len(c.CallOptions.ModifyAckDeadline):len(c.CallOptions.ModifyAckDeadline)], opts...)
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
_, err = c.subscriberClient.ModifyAckDeadline(ctx, req, settings.GRPC...)
return err
}, opts...)
return err
}
// Acknowledge acknowledges the messages associated with the ack_ids in the
// AcknowledgeRequest. The Pub/Sub system can remove the relevant messages
// from the subscription.
//
// Acknowledging a message whose ack deadline has expired may succeed,
// but such a message may be redelivered later. Acknowledging a message more
// than once will not result in an error.
func (c *SubscriberClient) Acknowledge(ctx context.Context, req *pubsubpb.AcknowledgeRequest, opts ...gax.CallOption) error {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.Acknowledge[0:len(c.CallOptions.Acknowledge):len(c.CallOptions.Acknowledge)], opts...)
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
_, err = c.subscriberClient.Acknowledge(ctx, req, settings.GRPC...)
return err
}, opts...)
return err
}
// Pull pulls messages from the server. Returns an empty list if there are no
// messages available in the backlog. The server may return UNAVAILABLE if
// there are too many concurrent pull requests pending for the given
// subscription.
func (c *SubscriberClient) Pull(ctx context.Context, req *pubsubpb.PullRequest, opts ...gax.CallOption) (*pubsubpb.PullResponse, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.Pull[0:len(c.CallOptions.Pull):len(c.CallOptions.Pull)], opts...)
var resp *pubsubpb.PullResponse
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.Pull(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// StreamingPull (EXPERIMENTAL) StreamingPull is an experimental feature. This RPC will
// respond with UNIMPLEMENTED errors unless you have been invited to test
// this feature. Contact cloud-pubsub@google.com with any questions.
//
// Establishes a stream with the server, which sends messages down to the
// client. The client streams acknowledgements and ack deadline modifications
// back to the server. The server will close the stream and return the status
// on any error. The server may close the stream with status OK to reassign
// server-side resources, in which case, the client should re-establish the
// stream. UNAVAILABLE may also be returned in the case of a transient error
// (e.g., a server restart). These should also be retried by the client. Flow
// control can be achieved by configuring the underlying RPC channel.
func (c *SubscriberClient) StreamingPull(ctx context.Context, opts ...gax.CallOption) (pubsubpb.Subscriber_StreamingPullClient, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.StreamingPull[0:len(c.CallOptions.StreamingPull):len(c.CallOptions.StreamingPull)], opts...)
var resp pubsubpb.Subscriber_StreamingPullClient
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.StreamingPull(ctx, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// ModifyPushConfig modifies the PushConfig for a specified subscription.
//
// This may be used to change a push subscription to a pull one (signified by
// an empty PushConfig) or vice versa, or change the endpoint URL and other
// attributes of a push subscription. Messages will accumulate for delivery
// continuously through the call regardless of changes to the PushConfig.
func (c *SubscriberClient) ModifyPushConfig(ctx context.Context, req *pubsubpb.ModifyPushConfigRequest, opts ...gax.CallOption) error {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.ModifyPushConfig[0:len(c.CallOptions.ModifyPushConfig):len(c.CallOptions.ModifyPushConfig)], opts...)
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
_, err = c.subscriberClient.ModifyPushConfig(ctx, req, settings.GRPC...)
return err
}, opts...)
return err
}
// ListSnapshots lists the existing snapshots.
func (c *SubscriberClient) ListSnapshots(ctx context.Context, req *pubsubpb.ListSnapshotsRequest, opts ...gax.CallOption) *SnapshotIterator {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.ListSnapshots[0:len(c.CallOptions.ListSnapshots):len(c.CallOptions.ListSnapshots)], opts...)
it := &SnapshotIterator{}
it.InternalFetch = func(pageSize int, pageToken string) ([]*pubsubpb.Snapshot, string, error) {
var resp *pubsubpb.ListSnapshotsResponse
req.PageToken = pageToken
if pageSize > math.MaxInt32 {
req.PageSize = math.MaxInt32
} else {
req.PageSize = int32(pageSize)
}
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.ListSnapshots(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, "", err
}
return resp.Snapshots, resp.NextPageToken, 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)
return it
}
// CreateSnapshot creates a snapshot from the requested subscription.
// If the snapshot already exists, returns ALREADY_EXISTS.
// If the requested subscription doesn't exist, returns NOT_FOUND.
//
// If the name is not provided in the request, the server will assign a random
// name for this snapshot on the same project as the subscription, conforming
// to the
// resource name format (at https://cloud.google.com/pubsub/docs/overview#names).
// The generated name is populated in the returned Snapshot object.
// Note that for REST API requests, you must specify a name in the request.
func (c *SubscriberClient) CreateSnapshot(ctx context.Context, req *pubsubpb.CreateSnapshotRequest, opts ...gax.CallOption) (*pubsubpb.Snapshot, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.CreateSnapshot[0:len(c.CallOptions.CreateSnapshot):len(c.CallOptions.CreateSnapshot)], opts...)
var resp *pubsubpb.Snapshot
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.CreateSnapshot(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// UpdateSnapshot updates an existing snapshot. Note that certain properties of a snapshot
// are not modifiable.
// NOTE: The style guide requires body: "snapshot" instead of body: "*".
// Keeping the latter for internal consistency in V1, however it should be
// corrected in V2. See
// https://cloud.google.com/apis/design/standard_methods#update for details.
func (c *SubscriberClient) UpdateSnapshot(ctx context.Context, req *pubsubpb.UpdateSnapshotRequest, opts ...gax.CallOption) (*pubsubpb.Snapshot, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.UpdateSnapshot[0:len(c.CallOptions.UpdateSnapshot):len(c.CallOptions.UpdateSnapshot)], opts...)
var resp *pubsubpb.Snapshot
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.UpdateSnapshot(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// DeleteSnapshot removes an existing snapshot. All messages retained in the snapshot
// are immediately dropped. After a snapshot is deleted, a new one may be
// created with the same name, but the new one has no association with the old
// snapshot or its subscription, unless the same subscription is specified.
func (c *SubscriberClient) DeleteSnapshot(ctx context.Context, req *pubsubpb.DeleteSnapshotRequest, opts ...gax.CallOption) error {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.DeleteSnapshot[0:len(c.CallOptions.DeleteSnapshot):len(c.CallOptions.DeleteSnapshot)], opts...)
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
_, err = c.subscriberClient.DeleteSnapshot(ctx, req, settings.GRPC...)
return err
}, opts...)
return err
}
// Seek seeks an existing subscription to a point in time or to a given snapshot,
// whichever is provided in the request.
func (c *SubscriberClient) Seek(ctx context.Context, req *pubsubpb.SeekRequest, opts ...gax.CallOption) (*pubsubpb.SeekResponse, error) {
ctx = insertMetadata(ctx, c.xGoogMetadata)
opts = append(c.CallOptions.Seek[0:len(c.CallOptions.Seek):len(c.CallOptions.Seek)], opts...)
var resp *pubsubpb.SeekResponse
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.subscriberClient.Seek(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// SnapshotIterator manages a stream of *pubsubpb.Snapshot.
type SnapshotIterator struct {
items []*pubsubpb.Snapshot
pageInfo *iterator.PageInfo
nextFunc func() error
// 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 []*pubsubpb.Snapshot, nextPageToken string, err error)
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *SnapshotIterator) 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 *SnapshotIterator) Next() (*pubsubpb.Snapshot, error) {
var item *pubsubpb.Snapshot
if err := it.nextFunc(); err != nil {
return item, err
}
item = it.items[0]
it.items = it.items[1:]
return item, nil
}
func (it *SnapshotIterator) bufLen() int {
return len(it.items)
}
func (it *SnapshotIterator) takeBuf() interface{} {
b := it.items
it.items = nil
return b
}
// SubscriptionIterator manages a stream of *pubsubpb.Subscription.
type SubscriptionIterator struct {
items []*pubsubpb.Subscription
pageInfo *iterator.PageInfo
nextFunc func() error
// 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 []*pubsubpb.Subscription, nextPageToken string, err error)
}
// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *SubscriptionIterator) 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 *SubscriptionIterator) Next() (*pubsubpb.Subscription, error) {
var item *pubsubpb.Subscription
if err := it.nextFunc(); err != nil {
return item, err
}
item = it.items[0]
it.items = it.items[1:]
return item, nil
}
func (it *SubscriptionIterator) bufLen() int {
return len(it.items)
}
func (it *SubscriptionIterator) takeBuf() interface{} {
b := it.items
it.items = nil
return b
}