bf51655a7b
Signed-off-by: Jacek J. Łakis <jacek.lakis@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
132 lines
3.9 KiB
Go
132 lines
3.9 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
|
|
//
|
|
// 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
|
|
//
|
|
// http://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.
|
|
|
|
package pubsub
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"cloud.google.com/go/iam"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
const MaxPublishBatchSize = 1000
|
|
|
|
// Topic is a reference to a PubSub topic.
|
|
type Topic struct {
|
|
s service
|
|
|
|
// The fully qualified identifier for the topic, in the format "projects/<projid>/topics/<name>"
|
|
name string
|
|
}
|
|
|
|
// CreateTopic creates a new topic.
|
|
// The specified topic ID must start with a letter, and contain only letters
|
|
// ([A-Za-z]), numbers ([0-9]), dashes (-), underscores (_), periods (.),
|
|
// tildes (~), plus (+) or percent signs (%). It must be between 3 and 255
|
|
// characters in length, and must not start with "goog".
|
|
// If the topic already exists an error will be returned.
|
|
func (c *Client) CreateTopic(ctx context.Context, id string) (*Topic, error) {
|
|
t := c.Topic(id)
|
|
err := c.s.createTopic(ctx, t.name)
|
|
return t, err
|
|
}
|
|
|
|
// Topic creates a reference to a topic.
|
|
func (c *Client) Topic(id string) *Topic {
|
|
return &Topic{
|
|
s: c.s,
|
|
name: fmt.Sprintf("projects/%s/topics/%s", c.projectID, id),
|
|
}
|
|
}
|
|
|
|
// Topics returns an iterator which returns all of the topics for the client's project.
|
|
func (c *Client) Topics(ctx context.Context) *TopicIterator {
|
|
return &TopicIterator{
|
|
s: c.s,
|
|
next: c.s.listProjectTopics(ctx, c.fullyQualifiedProjectName()),
|
|
}
|
|
}
|
|
|
|
// TopicIterator is an iterator that returns a series of topics.
|
|
type TopicIterator struct {
|
|
s service
|
|
next nextStringFunc
|
|
}
|
|
|
|
// Next returns the next topic. If there are no more topics, iterator.Done will be returned.
|
|
func (tps *TopicIterator) Next() (*Topic, error) {
|
|
topicName, err := tps.next()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Topic{s: tps.s, name: topicName}, nil
|
|
}
|
|
|
|
// ID returns the unique idenfier of the topic within its project.
|
|
func (t *Topic) ID() string {
|
|
slash := strings.LastIndex(t.name, "/")
|
|
if slash == -1 {
|
|
// name is not a fully-qualified name.
|
|
panic("bad topic name")
|
|
}
|
|
return t.name[slash+1:]
|
|
}
|
|
|
|
// String returns the printable globally unique name for the topic.
|
|
func (t *Topic) String() string {
|
|
return t.name
|
|
}
|
|
|
|
// Delete deletes the topic.
|
|
func (t *Topic) Delete(ctx context.Context) error {
|
|
return t.s.deleteTopic(ctx, t.name)
|
|
}
|
|
|
|
// Exists reports whether the topic exists on the server.
|
|
func (t *Topic) Exists(ctx context.Context) (bool, error) {
|
|
if t.name == "_deleted-topic_" {
|
|
return false, nil
|
|
}
|
|
|
|
return t.s.topicExists(ctx, t.name)
|
|
}
|
|
|
|
// Subscriptions returns an iterator which returns the subscriptions for this topic.
|
|
func (t *Topic) Subscriptions(ctx context.Context) *SubscriptionIterator {
|
|
// NOTE: zero or more Subscriptions that are ultimately returned by this
|
|
// Subscriptions iterator may belong to a different project to t.
|
|
return &SubscriptionIterator{
|
|
s: t.s,
|
|
next: t.s.listTopicSubscriptions(ctx, t.name),
|
|
}
|
|
}
|
|
|
|
// Publish publishes the supplied Messages to the topic.
|
|
// If successful, the server-assigned message IDs are returned in the same order as the supplied Messages.
|
|
// At most MaxPublishBatchSize messages may be supplied.
|
|
func (t *Topic) Publish(ctx context.Context, msgs ...*Message) ([]string, error) {
|
|
if len(msgs) == 0 {
|
|
return nil, nil
|
|
}
|
|
if len(msgs) > MaxPublishBatchSize {
|
|
return nil, fmt.Errorf("pubsub: got %d messages, but maximum batch size is %d", len(msgs), MaxPublishBatchSize)
|
|
}
|
|
return t.s.publishMessages(ctx, t.name, msgs)
|
|
}
|
|
|
|
func (t *Topic) IAM() *iam.Handle {
|
|
return t.s.iamHandle(t.name)
|
|
}
|