示例#1
0
// 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
}
示例#2
0
// 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
}