| // 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 pubsub |
| |
| import ( |
| "context" |
| "fmt" |
| "math" |
| "net/url" |
| "time" |
| |
| "github.com/golang/protobuf/proto" |
| gax "github.com/googleapis/gax-go/v2" |
| "google.golang.org/api/iterator" |
| "google.golang.org/api/option" |
| gtransport "google.golang.org/api/transport/grpc" |
| pubsubpb "google.golang.org/genproto/googleapis/pubsub/v1" |
| "google.golang.org/grpc" |
| "google.golang.org/grpc/codes" |
| "google.golang.org/grpc/metadata" |
| ) |
| |
| var newPublisherClientHook clientHook |
| |
| // PublisherCallOptions contains the retry settings for each method of PublisherClient. |
| type PublisherCallOptions struct { |
| CreateTopic []gax.CallOption |
| UpdateTopic []gax.CallOption |
| Publish []gax.CallOption |
| GetTopic []gax.CallOption |
| ListTopics []gax.CallOption |
| ListTopicSubscriptions []gax.CallOption |
| ListTopicSnapshots []gax.CallOption |
| DeleteTopic []gax.CallOption |
| DetachSubscription []gax.CallOption |
| } |
| |
| func defaultPublisherClientOptions() []option.ClientOption { |
| return []option.ClientOption{ |
| option.WithEndpoint("pubsub.googleapis.com:443"), |
| option.WithGRPCDialOption(grpc.WithDisableServiceConfig()), |
| option.WithScopes(DefaultAuthScopes()...), |
| option.WithGRPCDialOption(grpc.WithDefaultCallOptions( |
| grpc.MaxCallRecvMsgSize(math.MaxInt32))), |
| } |
| } |
| |
| func defaultPublisherCallOptions() *PublisherCallOptions { |
| return &PublisherCallOptions{ |
| CreateTopic: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| UpdateTopic: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| Publish: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Aborted, |
| codes.Canceled, |
| codes.Internal, |
| codes.ResourceExhausted, |
| codes.Unknown, |
| codes.Unavailable, |
| codes.DeadlineExceeded, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| GetTopic: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unknown, |
| codes.Aborted, |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| ListTopics: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unknown, |
| codes.Aborted, |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| ListTopicSubscriptions: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unknown, |
| codes.Aborted, |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| ListTopicSnapshots: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unknown, |
| codes.Aborted, |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| DeleteTopic: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| DetachSubscription: []gax.CallOption{ |
| gax.WithRetry(func() gax.Retryer { |
| return gax.OnCodes([]codes.Code{ |
| codes.Unavailable, |
| }, gax.Backoff{ |
| Initial: 100 * time.Millisecond, |
| Max: 60000 * time.Millisecond, |
| Multiplier: 1.30, |
| }) |
| }), |
| }, |
| } |
| } |
| |
| // PublisherClient is a client for interacting with Cloud Pub/Sub API. |
| // |
| // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls. |
| type PublisherClient 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 |
| |
| // The gRPC API client. |
| publisherClient pubsubpb.PublisherClient |
| |
| // The call options for this service. |
| CallOptions *PublisherCallOptions |
| |
| // The x-goog-* metadata to be sent with each request. |
| xGoogMetadata metadata.MD |
| } |
| |
| // NewPublisherClient creates a new publisher client. |
| // |
| // The service that an application uses to manipulate topics, and to send |
| // messages to a topic. |
| func NewPublisherClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) { |
| clientOpts := defaultPublisherClientOptions() |
| |
| if newPublisherClientHook != nil { |
| hookOpts, err := newPublisherClientHook(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 |
| } |
| c := &PublisherClient{ |
| connPool: connPool, |
| disableDeadlines: disableDeadlines, |
| CallOptions: defaultPublisherCallOptions(), |
| |
| publisherClient: pubsubpb.NewPublisherClient(connPool), |
| } |
| c.setGoogleClientInfo() |
| |
| return c, nil |
| } |
| |
| // Connection returns a connection to the API service. |
| // |
| // Deprecated. |
| func (c *PublisherClient) 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 *PublisherClient) 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 *PublisherClient) 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...)) |
| } |
| |
| // CreateTopic creates the given topic with the given name. See the resource name rules (at https://cloud.google.com/pubsub/docs/admin#resource_names). |
| func (c *PublisherClient) CreateTopic(ctx context.Context, req *pubsubpb.Topic, opts ...gax.CallOption) (*pubsubpb.Topic, error) { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.CreateTopic[0:len(c.CallOptions.CreateTopic):len(c.CallOptions.CreateTopic)], opts...) |
| var resp *pubsubpb.Topic |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| resp, err = c.publisherClient.CreateTopic(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // UpdateTopic updates an existing topic. Note that certain properties of a |
| // topic are not modifiable. |
| func (c *PublisherClient) UpdateTopic(ctx context.Context, req *pubsubpb.UpdateTopicRequest, opts ...gax.CallOption) (*pubsubpb.Topic, error) { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic.name", url.QueryEscape(req.GetTopic().GetName()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.UpdateTopic[0:len(c.CallOptions.UpdateTopic):len(c.CallOptions.UpdateTopic)], opts...) |
| var resp *pubsubpb.Topic |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| resp, err = c.publisherClient.UpdateTopic(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // Publish adds one or more messages to the topic. Returns NOT_FOUND if the topic |
| // does not exist. |
| func (c *PublisherClient) Publish(ctx context.Context, req *pubsubpb.PublishRequest, opts ...gax.CallOption) (*pubsubpb.PublishResponse, error) { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic", url.QueryEscape(req.GetTopic()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.Publish[0:len(c.CallOptions.Publish):len(c.CallOptions.Publish)], opts...) |
| var resp *pubsubpb.PublishResponse |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| resp, err = c.publisherClient.Publish(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // GetTopic gets the configuration of a topic. |
| func (c *PublisherClient) GetTopic(ctx context.Context, req *pubsubpb.GetTopicRequest, opts ...gax.CallOption) (*pubsubpb.Topic, error) { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic", url.QueryEscape(req.GetTopic()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.GetTopic[0:len(c.CallOptions.GetTopic):len(c.CallOptions.GetTopic)], opts...) |
| var resp *pubsubpb.Topic |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| resp, err = c.publisherClient.GetTopic(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // ListTopics lists matching topics. |
| func (c *PublisherClient) ListTopics(ctx context.Context, req *pubsubpb.ListTopicsRequest, opts ...gax.CallOption) *TopicIterator { |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "project", url.QueryEscape(req.GetProject()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.ListTopics[0:len(c.CallOptions.ListTopics):len(c.CallOptions.ListTopics)], opts...) |
| it := &TopicIterator{} |
| req = proto.Clone(req).(*pubsubpb.ListTopicsRequest) |
| it.InternalFetch = func(pageSize int, pageToken string) ([]*pubsubpb.Topic, string, error) { |
| var resp *pubsubpb.ListTopicsResponse |
| 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.publisherClient.ListTopics(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, "", err |
| } |
| |
| it.Response = resp |
| return resp.GetTopics(), 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 |
| } |
| |
| // ListTopicSubscriptions lists the names of the attached subscriptions on this topic. |
| func (c *PublisherClient) ListTopicSubscriptions(ctx context.Context, req *pubsubpb.ListTopicSubscriptionsRequest, opts ...gax.CallOption) *StringIterator { |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic", url.QueryEscape(req.GetTopic()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.ListTopicSubscriptions[0:len(c.CallOptions.ListTopicSubscriptions):len(c.CallOptions.ListTopicSubscriptions)], opts...) |
| it := &StringIterator{} |
| req = proto.Clone(req).(*pubsubpb.ListTopicSubscriptionsRequest) |
| it.InternalFetch = func(pageSize int, pageToken string) ([]string, string, error) { |
| var resp *pubsubpb.ListTopicSubscriptionsResponse |
| 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.publisherClient.ListTopicSubscriptions(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, "", err |
| } |
| |
| it.Response = resp |
| return resp.GetSubscriptions(), 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 |
| } |
| |
| // ListTopicSnapshots lists the names of the snapshots on this topic. Snapshots are used in |
| // Seek (at https://cloud.google.com/pubsub/docs/replay-overview) operations, |
| // which allow you to manage message acknowledgments in bulk. That is, you can |
| // set the acknowledgment state of messages in an existing subscription to the |
| // state captured by a snapshot. |
| func (c *PublisherClient) ListTopicSnapshots(ctx context.Context, req *pubsubpb.ListTopicSnapshotsRequest, opts ...gax.CallOption) *StringIterator { |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic", url.QueryEscape(req.GetTopic()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.ListTopicSnapshots[0:len(c.CallOptions.ListTopicSnapshots):len(c.CallOptions.ListTopicSnapshots)], opts...) |
| it := &StringIterator{} |
| req = proto.Clone(req).(*pubsubpb.ListTopicSnapshotsRequest) |
| it.InternalFetch = func(pageSize int, pageToken string) ([]string, string, error) { |
| var resp *pubsubpb.ListTopicSnapshotsResponse |
| 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.publisherClient.ListTopicSnapshots(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, "", err |
| } |
| |
| it.Response = resp |
| return resp.GetSnapshots(), 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 |
| } |
| |
| // DeleteTopic deletes the topic with the given name. Returns NOT_FOUND if the topic |
| // does not exist. After a topic is deleted, a new topic may be created with |
| // the same name; this is an entirely new topic with none of the old |
| // configuration or subscriptions. Existing subscriptions to this topic are |
| // not deleted, but their topic field is set to _deleted-topic_. |
| func (c *PublisherClient) DeleteTopic(ctx context.Context, req *pubsubpb.DeleteTopicRequest, opts ...gax.CallOption) error { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "topic", url.QueryEscape(req.GetTopic()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.DeleteTopic[0:len(c.CallOptions.DeleteTopic):len(c.CallOptions.DeleteTopic)], opts...) |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| _, err = c.publisherClient.DeleteTopic(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| return err |
| } |
| |
| // DetachSubscription detaches a subscription from this topic. All messages retained in the |
| // subscription are dropped. Subsequent Pull and StreamingPull requests |
| // will return FAILED_PRECONDITION. If the subscription is a push |
| // subscription, pushes to the endpoint will stop. |
| func (c *PublisherClient) DetachSubscription(ctx context.Context, req *pubsubpb.DetachSubscriptionRequest, opts ...gax.CallOption) (*pubsubpb.DetachSubscriptionResponse, error) { |
| if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines { |
| cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond) |
| defer cancel() |
| ctx = cctx |
| } |
| md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "subscription", url.QueryEscape(req.GetSubscription()))) |
| ctx = insertMetadata(ctx, c.xGoogMetadata, md) |
| opts = append(c.CallOptions.DetachSubscription[0:len(c.CallOptions.DetachSubscription):len(c.CallOptions.DetachSubscription)], opts...) |
| var resp *pubsubpb.DetachSubscriptionResponse |
| err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error { |
| var err error |
| resp, err = c.publisherClient.DetachSubscription(ctx, req, settings.GRPC...) |
| return err |
| }, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return resp, nil |
| } |
| |
| // StringIterator manages a stream of string. |
| type StringIterator struct { |
| items []string |
| 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 []string, nextPageToken string, err error) |
| } |
| |
| // PageInfo supports pagination. See the google.golang.org/api/iterator package for details. |
| func (it *StringIterator) 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 *StringIterator) Next() (string, error) { |
| var item string |
| if err := it.nextFunc(); err != nil { |
| return item, err |
| } |
| item = it.items[0] |
| it.items = it.items[1:] |
| return item, nil |
| } |
| |
| func (it *StringIterator) bufLen() int { |
| return len(it.items) |
| } |
| |
| func (it *StringIterator) takeBuf() interface{} { |
| b := it.items |
| it.items = nil |
| return b |
| } |
| |
| // TopicIterator manages a stream of *pubsubpb.Topic. |
| type TopicIterator struct { |
| items []*pubsubpb.Topic |
| 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 []*pubsubpb.Topic, nextPageToken string, err error) |
| } |
| |
| // PageInfo supports pagination. See the google.golang.org/api/iterator package for details. |
| func (it *TopicIterator) 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 *TopicIterator) Next() (*pubsubpb.Topic, error) { |
| var item *pubsubpb.Topic |
| if err := it.nextFunc(); err != nil { |
| return item, err |
| } |
| item = it.items[0] |
| it.items = it.items[1:] |
| return item, nil |
| } |
| |
| func (it *TopicIterator) bufLen() int { |
| return len(it.items) |
| } |
| |
| func (it *TopicIterator) takeBuf() interface{} { |
| b := it.items |
| it.items = nil |
| return b |
| } |