// ListTopics lists matching topics.
func (c *PublisherClient) ListTopics(ctx context.Context, req *pubsubpb.ListTopicsRequest) *TopicIterator {
md, _ := metadata.FromContext(ctx)
ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
it := &TopicIterator{}
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) error {
var err error
resp, err = c.publisherClient.ListTopics(ctx, req)
return err
}, c.CallOptions.ListTopics...)
if err != nil {
return nil, "", err
}
return resp.Topics, 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
}
// ListTopics lists matching topics.
func (c *PublisherClient) ListTopics(ctx context.Context, req *pubsubpb.ListTopicsRequest) *TopicIterator {
ctx = metadata.NewContext(ctx, c.metadata)
it := &TopicIterator{}
it.apiCall = func() error {
var resp *pubsubpb.ListTopicsResponse
err := gax.Invoke(ctx, func(ctx context.Context) error {
var err error
req.PageToken = it.nextPageToken
req.PageSize = it.pageSize
resp, err = c.client.ListTopics(ctx, req)
return err
}, c.CallOptions.ListTopics...)
if err != nil {
return err
}
if resp.NextPageToken == "" {
it.atLastPage = true
}
it.nextPageToken = resp.NextPageToken
it.items = resp.Topics
return nil
}
return it
}