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using System;
using System.Data;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Npgsql.Logging;
using NUnit.Framework;
namespace Npgsql.Tests
{
public class NotificationTests : TestBase
{
[Test, Description("Simple LISTEN/NOTIFY scenario")]
public void Notification()
{
using (var conn = OpenConnection())
{
var receivedNotification = false;
conn.ExecuteNonQuery("LISTEN notifytest");
conn.Notification += (o, e) => receivedNotification = true;
conn.ExecuteNonQuery("NOTIFY notifytest");
Assert.IsTrue(receivedNotification);
}
}
//[Test, Description("Generates a notification that arrives after reader data that is already being read")]
[IssueLink("https://github.com/npgsql/npgsql/issues/252")]
public void NotificationAfterData()
{
var receivedNotification = false;
using (var conn = OpenConnection())
using (var cmd = conn.CreateCommand())
{
cmd.CommandText = "LISTEN notifytest1";
cmd.ExecuteNonQuery();
conn.Notification += (o, e) => receivedNotification = true;
cmd.CommandText = "SELECT generate_series(1,10000)";
using (var reader = cmd.ExecuteReader())
{
//After "notify notifytest1", a notification message will be sent to client,
//And so the notification message will stick with the last response message of "select generate_series(1,10000)" in Npgsql's tcp receiving buffer.
using (var conn2 = new NpgsqlConnection(ConnectionString))
{
conn2.Open();
using (var command = conn2.CreateCommand())
{
command.CommandText = "NOTIFY notifytest1";
command.ExecuteNonQuery();
}
}
// Allow some time for the notification to get delivered
Thread.Sleep(2000);
Assert.IsTrue(reader.Read());
Assert.AreEqual(1, reader.GetValue(0));
}
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
Assert.IsTrue(receivedNotification);
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1024")]
[Timeout(10000)]
public void Wait()
{
using (var conn = OpenConnection())
using (var notifyingConn = OpenConnection())
{
var receivedNotification = false;
conn.ExecuteNonQuery("LISTEN notifytest");
notifyingConn.ExecuteNonQuery("NOTIFY notifytest");
conn.Notification += (o, e) => receivedNotification = true;
Assert.That(conn.Wait(0), Is.EqualTo(true));
Assert.IsTrue(receivedNotification);
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1024")]
//[Timeout(10000)]
public void WaitWithTimeout()
{
using (var conn = OpenConnection())
{
Assert.That(conn.Wait(100), Is.EqualTo(false));
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
}
[Test]
public void WaitWithPrependedMessage()
{
using (OpenConnection()) {} // A DISCARD ALL is now prepended in the connection's write buffer
using (var conn = OpenConnection())
Assert.That(conn.Wait(100), Is.EqualTo(false));
}
[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1024")]
[Timeout(10000)]
public async Task WaitAsync()
{
using (var conn = OpenConnection())
using (var notifyingConn = OpenConnection())
{
var receivedNotification = false;
conn.ExecuteNonQuery("LISTEN notifytest");
notifyingConn.ExecuteNonQuery("NOTIFY notifytest");
conn.Notification += (o, e) => receivedNotification = true;
await conn.WaitAsync();
Assert.IsTrue(receivedNotification);
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
}
[Test]
public void WaitWithKeepalive()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
KeepAlive = 1,
Pooling = false
};
using (var conn = OpenConnection(csb))
using (var notifyingConn = OpenConnection())
{
conn.ExecuteNonQuery("LISTEN notifytest");
Task.Delay(2000).ContinueWith(t => notifyingConn.ExecuteNonQuery("NOTIFY notifytest"));
conn.Wait();
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
//Assert.That(TestLoggerSink.Records, Has.Some.With.Property("EventId").EqualTo(new EventId(NpgsqlEventId.Keepalive)));
}
[Test]
public async Task WaitAsyncWithKeepalive()
{
var csb = new NpgsqlConnectionStringBuilder(ConnectionString)
{
KeepAlive = 1,
Pooling = false
};
using (var conn = OpenConnection(csb))
using (var notifyingConn = OpenConnection())
{
conn.ExecuteNonQuery("LISTEN notifytest");
#pragma warning disable 4014
Task.Delay(2000).ContinueWith(t => notifyingConn.ExecuteNonQuery("NOTIFY notifytest"));
#pragma warning restore 4014
await conn.WaitAsync();
//Assert.That(TestLoggerSink.Records, Has.Some.With.Property("EventId").EqualTo(new EventId(NpgsqlEventId.Keepalive)));
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
}
[Test]
public void WaitAsyncCancellation()
{
using (var conn = OpenConnection())
{
conn.ExecuteNonQuery("LISTEN notifytest");
var cts = new CancellationTokenSource(1000);
Assert.That(async () => await conn.WaitAsync(cts.Token), Throws.Exception.TypeOf<TaskCanceledException>());
Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
}
}
[Test]
public void WaitBreaksConnection()
{
using (var conn = OpenConnection())
{
Task.Delay(1000).ContinueWith(t =>
{
using (var conn2 = OpenConnection())
conn2.ExecuteNonQuery($"SELECT pg_terminate_backend({conn.ProcessID})");
});
Assert.That(() => conn.Wait(), Throws.Exception.TypeOf<NpgsqlException>());
Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Broken));
}
}
}
}