static void Main(string[] args)
{
// Prerequisites
// 1. create a new cloud project with your google account
// 2. enable cloud pubsub API on that project
// 3. 'gcloud auth login' to store your google credential in a well known location (from where GoogleCredential.GetApplicationDefaultAsync() can pick it up).
var credentials = Task.Run(() => GoogleCredential.GetApplicationDefaultAsync()).Result;
Channel channel = new Channel("pubsub-experimental.googleapis.com", credentials.ToChannelCredentials());
var publisherClient = new Google.Pubsub.V1.Publisher.PublisherClient(channel);
var subscriberClient = new Google.Pubsub.V1.Subscriber.SubscriberClient(channel);
var topics = publisherClient.ListTopics(new ListTopicsRequest {
Project = ProjectName
}).Topics;
// create the topic if it doesn't exist yet
var topic = new Topic {
Name = TopicName
};
if (!topics.Contains(topic))
{
Console.WriteLine("Creating topic {0}.", TopicName);
topic = publisherClient.CreateTopic(topic);
}
else
{
Console.WriteLine("Topic {0} already exists.", TopicName);
}
// create a subscription if it doesn't exist yet.
try
{
subscriberClient.CreateSubscription(new Subscription {
Name = SubscriptionName, Topic = TopicName
});
}
catch (RpcException e)
{
// if we created the subscription before, that's fine.
if (e.Status.StatusCode != StatusCode.AlreadyExists)
{
throw;
}
}
// publish something
publisherClient.Publish(new PublishRequest
{
Topic = topic.Name,
// TODO: try use attributes
Messages = { new PubsubMessage {
Data = ByteString.CopyFrom(1, 2, 3)
}, new PubsubMessage{
Data = ByteString.CopyFrom(0xaa, 0xff)
} }
});
// try to read what we published.
var receivedMessages = subscriberClient.Pull(new PullRequest {
Subscription = SubscriptionName, MaxMessages = 100, ReturnImmediately = false
}).ReceivedMessages;
foreach (var msg in receivedMessages)
{
Console.WriteLine("Received message with Id {0} and data {1}", msg.Message.MessageId, msg.Message.Data);
}
// TODO: we need to Ack the messages so that they don't show up again after ack deadline.
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
channel.ShutdownAsync();
}
static void Main(string[] args)
{
// Prerequisites
// 1. create a new cloud project with your google account
// 2. enable cloud pubsub API on that project
// 3. 'gcloud auth login' to store your google credential in a well known location (from where GoogleCredential.GetApplicationDefaultAsync() can pick it up).
var credentials = Task.Run(() => GoogleCredential.GetApplicationDefaultAsync()).Result;
Channel channel = new Channel("pubsub-experimental.googleapis.com", credentials.ToChannelCredentials());
var publisherClient = new Google.Pubsub.V1.Publisher.PublisherClient(channel);
var subscriberClient = new Google.Pubsub.V1.Subscriber.SubscriberClient(channel);
var topics = publisherClient.ListTopics(new ListTopicsRequest { Project = ProjectName }).Topics;
// create the topic if it doesn't exist yet
var topic = new Topic { Name = TopicName };
if (!topics.Contains(topic))
{
Console.WriteLine("Creating topic {0}.", TopicName);
topic = publisherClient.CreateTopic(topic);
}
else
{
Console.WriteLine("Topic {0} already exists.", TopicName);
}
// create a subscription if it doesn't exist yet.
try
{
subscriberClient.CreateSubscription(new Subscription { Name = SubscriptionName, Topic = TopicName });
}
catch (RpcException e)
{
// if we created the subscription before, that's fine.
if (e.Status.StatusCode != StatusCode.AlreadyExists)
{
throw;
}
}
// publish something
publisherClient.Publish(new PublishRequest
{
Topic = topic.Name,
// TODO: try use attributes
Messages = { new PubsubMessage { Data = ByteString.CopyFrom(1, 2, 3) }, new PubsubMessage { Data = ByteString.CopyFrom(0xaa, 0xff) } }
});
// try to read what we published.
var receivedMessages = subscriberClient.Pull(new PullRequest { Subscription = SubscriptionName, MaxMessages = 100, ReturnImmediately = false }).ReceivedMessages;
foreach (var msg in receivedMessages)
{
Console.WriteLine("Received message with Id {0} and data {1}", msg.Message.MessageId, msg.Message.Data);
}
// TODO: we need to Ack the messages so that they don't show up again after ack deadline.
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
channel.ShutdownAsync();
}
