// This example demonstrates calling the Cloud Pub/Sub API. As of 20
// Aug 2014, the Cloud Pub/Sub API is only available if you're
// whitelisted. If you're interested in using it, please apply for the
// Limited Preview program at the following form:
// http://goo.gl/Wql9HL
//
// Also, before running this example, be sure to enable Cloud Pub/Sub
// service on your project in Developer Console at:
// https://console.developers.google.com/
//
// It has 8 subcommands as follows:
//
// <project_id> list_topics
// <project_id> create_topic <topic>
// <project_id> delete_topic <topic>
// <project_id> list_subscriptions
// <project_id> create_subscription <subscription> <linked topic>
// <project_id> delete_subscription <subscription>
// <project_id> connect_irc <topic> <server> <channel>
// <project_id> pull_messages <subscription>
//
// You can use either of your alphanumerical or numerial Cloud Project
// ID for project_id. You can choose any names for topic and
// subscription as long as they follow the naming rule described at:
// https://developers.google.com/pubsub/overview#names
//
// You can list/create/delete topics/subscriptions by self-explanatory
// subcommands, as well as connect to an IRC channel and publish
// messages from the IRC channel to a specified Cloud Pub/Sub topic by
// the "connect_irc" subcommand, or continuously pull messages from a
// specified Cloud Pub/Sub subscription and display the data by the
// "pull_messages" subcommand.
func pubsubMain(client *http.Client, argv []string) {
checkArgs(argv, 2)
service, err := pubsub.New(client)
if err != nil {
log.Fatalf("Unable to create PubSub service: %v", err)
}
m := map[string]func(service *pubsub.Service, argv []string){
"list_topics": listTopics,
"create_topic": createTopic,
"delete_topic": deleteTopic,
"list_subscriptions": listSubscriptions,
"create_subscription": createSubscription,
"delete_subscription": deleteSubscription,
"connect_irc": connectIRC,
"pull_messages": pullMessages,
}
f, ok := m[argv[1]]
if !ok {
pubsubUsage()
os.Exit(2)
}
f(service, argv)
}
// NewClient create a new PubSub client.
func NewClient(ctx context.Context, projectID string, opts ...cloud.ClientOption) (*Client, error) {
o := []cloud.ClientOption{
cloud.WithEndpoint(prodAddr),
cloud.WithScopes(raw.PubsubScope, raw.CloudPlatformScope),
cloud.WithUserAgent(userAgent),
}
o = append(o, opts...)
httpClient, endpoint, err := transport.NewHTTPClient(ctx, o...)
if err != nil {
return nil, fmt.Errorf("dialing: %v", err)
}
s, err := raw.New(httpClient)
if err != nil {
return nil, err
}
s.BasePath = endpoint
c := &Client{
projectID: projectID,
s: s,
}
return c, nil
}
func rawService(ctx context.Context) *raw.Service {
return internal.Service(ctx, "pubsub", func(hc *http.Client) interface{} {
svc, _ := raw.New(hc)
return svc
}).(*raw.Service)
}