public void CreateSubscription_RequestObject()
{
// Snippet: CreateSubscription(Subscription,CallSettings)
// Create client
SubscriberClient subscriberClient = SubscriberClient.Create();
// Initialize request argument(s)
Subscription request = new Subscription
{
SubscriptionName = new SubscriptionName("[PROJECT]", "[SUBSCRIPTION]"),
TopicAsTopicNameOneof = TopicNameOneof.From(new TopicName("[PROJECT]", "[TOPIC]")),
};
// Make the request
Subscription response = subscriberClient.CreateSubscription(request);
// End snippet
}
static int Main(string[] args)
{
if (args.Length != 3)
{
Console.WriteLine("Call with three args: <emulator port> <input file> <output file>");
Console.WriteLine("This connects to host 127.0.0.1, so requires the emulator to be started using ipv4, not ipv6:");
Console.WriteLine(" E.g. cloud-pubsub-emulator.bat --host=127.0.0.1 --port=8700");
Console.WriteLine("It reads and writes CSV files as specified in the 'Testing Ordering Keys' section of the");
Console.WriteLine(" 'Pub/Sub Ordering Key Client Libraries' doc.");
Console.WriteLine();
return(1);
}
// Read inputs.
var port = int.Parse(args[0]);
var inputLines = File.ReadAllLines(args[1]).Select(line => new InputLine(line)).ToList();
// Setup gRPC channel to pubsub emulator.
var channel = new Channel("127.0.0.1", port, ChannelCredentials.Insecure);
// Create topic and subscription names.
var topicName = new TopicName("project", $"topic-{Guid.NewGuid()}");
var subscriptionName = new SubscriptionName("project", $"subscription-{Guid.NewGuid()}");
// List that records all received messages.
var recvMsgs = new List <PubsubMessage>();
// Run test.
CreateTopicAndSubscription();
Task subTask = Subscribe();
IEnumerable <Task> pubTasks = Publish();
// Wait for publish and subscribe tasks to complete.
Console.WriteLine("Waiting for all publish tasks to complete");
Task.WaitAll(pubTasks.ToArray());
Console.WriteLine("All publish tasks completed");
Console.WriteLine("Waiting for subscribe task to complete");
subTask.Wait();
Console.WriteLine("Subscribe task completed");
// Output ordered CSV file of recevied messages, for the validator.
var csvLines = recvMsgs.Select(x => $"\"{x.OrderingKey}\",\"{x.Data.ToStringUtf8()}\"").ToList();
File.WriteAllLines(args[2], csvLines);
Console.WriteLine("Output file written; all done :)");
return(0);
void CreateTopicAndSubscription()
{
Console.WriteLine("Creating topic and subscription");
var pubApi = PublisherServiceApiClient.Create(channel);
var topic = pubApi.CreateTopic(topicName);
var subApi = SubscriberServiceApiClient.Create(channel);
subApi.CreateSubscription(new Subscription
{
EnableMessageOrdering = true,
TopicAsTopicNameOneof = TopicNameOneof.From(topicName),
SubscriptionName = subscriptionName,
AckDeadlineSeconds = 120,
});
}
Task Subscribe()
{
Console.WriteLine("Creating subscribers");
var subs = new[]
{
SubscriberServiceApiClient.Create(channel),
SubscriberServiceApiClient.Create(channel),
SubscriberServiceApiClient.Create(channel)
};
var sub = new SubscriberClientImpl(subscriptionName, subs, new SubscriberClient.Settings(), null);
var recvCount = 0;
var rnd = new Random();
Console.WriteLine("Starting subscriber callback");
return(sub.StartAsync(async(msg, ct) =>
{
lock (recvMsgs)
{
recvMsgs.Add(msg.Clone());
recvCount += 1;
if (recvCount == inputLines.Count)
{
Console.WriteLine("Received all messages, shutting down");
var dummyTask = sub.StopAsync(CancellationToken.None);
}
}
if (rnd.Next(3) == 0)
{
await Task.Delay(rnd.Next(3));
}
return SubscriberClient.Reply.Ack;
}));
}
IEnumerable <Task> Publish()
{
Console.WriteLine("Creating publishers");
var pubs = new[]
{
PublisherServiceApiClient.Create(channel),
PublisherServiceApiClient.Create(channel),
PublisherServiceApiClient.Create(channel)
};
var pub = new PublisherClientImpl(topicName, pubs, new PublisherClient.Settings {
EnableMessageOrdering = true
}, null);
var publishTasks = new List <Task>();
Console.WriteLine("Starting to publish");
foreach (var inputLine in inputLines)
{
var pubTask = pub.PublishAsync(inputLine.OrderingKey, inputLine.Message);
publishTasks.Add(pubTask);
}
Console.WriteLine("Publishing complete");
return(publishTasks);
}
}
