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using System;

using System.Data;

using System.Transactions;

using NUnit.Framework;

namespace Npgsql.Tests

{

// This test suite contains ambient transaction tests, except those involving distributed transactions which are only

// supported on .NET Framework / Windows. Distributed transaction tests are in DistributedTransactionTests.

[NonParallelizable]

public class SystemTransactionTests : TestBase

{

[Test, Description("Single connection enlisting explicitly, committing")]

public void ExplicitEnlist()

{

using var conn = new NpgsqlConnection(ConnectionStringEnlistOff);

conn.Open();

using (var scope = new TransactionScope())

{

conn.EnlistTransaction(Transaction.Current);

Assert.That(conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

scope.Complete();

}

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

using (var tx = conn.BeginTransaction())

{

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(1), "Unexpected data count");

tx.Rollback();

}

}

[Test, Description("Single connection enlisting implicitly, committing")]

public void ImplicitEnlist()

{

var conn = new NpgsqlConnection(ConnectionStringEnlistOn);

using (var scope = new TransactionScope())

{

conn.Open();

Assert.That(conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

scope.Complete();

}

using (var tx = conn.BeginTransaction())

{

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(1), "Unexpected data count");

tx.Rollback();

}

}

[Test]

public void EnlistOff()

{

using (new TransactionScope())

using (var conn1 = OpenConnection(ConnectionStringEnlistOff))

using (var conn2 = OpenConnection(ConnectionStringEnlistOff))

{

Assert.That(conn1.EnlistedTransaction, Is.Null);

Assert.That(conn1.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

Assert.That(conn2.ExecuteScalar("SELECT COUNT(*) FROM data"), Is.EqualTo(1), "Unexpected data count");

}

// Scope disposed and not completed => rollback, but no enlistment, so changes should still be there.

using (var conn3 = OpenConnection(ConnectionStringEnlistOff))

{

Assert.That(conn3.ExecuteScalar("SELECT COUNT(*) FROM data"), Is.EqualTo(1), "Insert unexpectedly rollback-ed");

}

}

[Test, Description("Single connection enlisting explicitly, rollback")]

public void RollbackExplicitEnlist()

{

using var conn = OpenConnection();

using (new TransactionScope())

{

conn.EnlistTransaction(Transaction.Current);

Assert.That(conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

// No commit

}

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

using (var tx = conn.BeginTransaction())

{

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(0), "Unexpected data count");

tx.Rollback();

}

}

[Test, Description("Single connection enlisting implicitly, rollback")]

public void RollbackImplicitEnlist()

{

using (new TransactionScope())

using (var conn = OpenConnection(ConnectionStringEnlistOn))

{

Assert.That(conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

// No commit

}

AssertNumberOfRows(0);

}

[Test]

public void TwoConsecutiveConnections()

{

using (var scope = new TransactionScope())

{

using (var conn1 = OpenConnection(ConnectionStringEnlistOn))

{

Assert.That(conn1.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test1')"), Is.EqualTo(1), "Unexpected first insert rowcount");

}

using (var conn2 = OpenConnection(ConnectionStringEnlistOn))

{

Assert.That(conn2.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test2')"), Is.EqualTo(1), "Unexpected second insert rowcount");

}

// Consecutive connections used in same scope should not promote the

// transaction to distributed.

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

scope.Complete();

}

AssertNumberOfRows(2);

}

[Test]

public void CloseConnection()

{

var connString = new NpgsqlConnectionStringBuilder(ConnectionStringEnlistOn)

{

ApplicationName = nameof(CloseConnection),

}.ToString();

using (var scope = new TransactionScope())

using (var conn = OpenConnection(connString))

{

Assert.That(conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test')"), Is.EqualTo(1), "Unexpected insert rowcount");

conn.Close();

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

scope.Complete();

}

AssertNumberOfRows(1);

Assert.True(PoolManager.TryGetValue(connString, out var pool));

Assert.That(pool!.Statistics.Idle, Is.EqualTo(1));

using (var conn = new NpgsqlConnection(connString))

NpgsqlConnection.ClearPool(conn);

}

[Test]

public void EnlistToTwoTransactions()

{

using var conn = OpenConnection(ConnectionStringEnlistOff);

var ctx = new CommittableTransaction();

conn.EnlistTransaction(ctx);

Assert.That(() => conn.EnlistTransaction(new CommittableTransaction()), Throws.Exception.TypeOf<InvalidOperationException>());

ctx.Rollback();

using var tx = conn.BeginTransaction();

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(0));

tx.Rollback();

}

[Test]

public void EnlistTwiceToSameTransaction()

{

using var conn = OpenConnection(ConnectionStringEnlistOff);

var ctx = new CommittableTransaction();

conn.EnlistTransaction(ctx);

conn.EnlistTransaction(ctx);

ctx.Rollback();

using var tx = conn.BeginTransaction();

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(0));

tx.Rollback();

}

[Test]

public void ScopeAfterScope()

{

using var conn = OpenConnection(ConnectionStringEnlistOff);

using (new TransactionScope())

conn.EnlistTransaction(Transaction.Current);

using (new TransactionScope())

conn.EnlistTransaction(Transaction.Current);

using (var tx = conn.BeginTransaction())

{

Assert.That(conn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(0));

tx.Rollback();

}

}

[Test]

public void ReuseConnection()

{

using (var scope = new TransactionScope())

using (var conn = new NpgsqlConnection(ConnectionStringEnlistOn))

{

conn.Open();

var processId = conn.ProcessID;

conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test1')");

conn.Close();

conn.Open();

Assert.That(conn.ProcessID, Is.EqualTo(processId));

conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test2')");

conn.Close();

scope.Complete();

}

AssertNumberOfRows(2);

}

[Test]

public void ReuseConnectionRollback()

{

using (new TransactionScope())

using (var conn = new NpgsqlConnection(ConnectionStringEnlistOn))

{

conn.Open();

var processId = conn.ProcessID;

conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test1')");

conn.Close();

conn.Open();

Assert.That(conn.ProcessID, Is.EqualTo(processId));

conn.ExecuteNonQuery(@"INSERT INTO data (name) VALUES ('test2')");

conn.Close();

// No commit

}

AssertNumberOfRows(0);

}

[Test, Ignore("Timeout doesn't seem to fire on .NET Core / Linux")]

public void TimeoutTriggersRollbackWhileBusy()

{

using (var conn = OpenConnection(ConnectionStringEnlistOff))

{

using (new TransactionScope(TransactionScopeOption.Required, TimeSpan.FromSeconds(1)))

{

conn.EnlistTransaction(Transaction.Current);

Assert.That(() => CreateSleepCommand(conn, 5).ExecuteNonQuery(),

Throws.Exception.TypeOf<PostgresException>()

.With.Property(nameof(PostgresException.SqlState))

.EqualTo(PostgresErrorCodes.QueryCanceled));

}

}

AssertNumberOfRows(0);

}

[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1579")]

public void SchemaConnectionShouldntEnlist()

{

using var tran = new TransactionScope();

using var conn = OpenConnection(ConnectionStringEnlistOn);

using var cmd = new NpgsqlCommand("SELECT * FROM data", conn);

using var reader = cmd.ExecuteReader(CommandBehavior.KeyInfo);

reader.GetColumnSchema();

AssertNoDistributedIdentifier();

AssertNoPreparedTransactions();

tran.Complete();

}

[Test, IssueLink("https://github.com/npgsql/npgsql/issues/1737")]

public void Bug1737()

{

var csb = new NpgsqlConnectionStringBuilder(ConnectionString)

{

Pooling = false,

Enlist = true

};

// Case 1

using (var scope = new TransactionScope())

{

using (var conn = OpenConnection(csb))

using (var cmd = new NpgsqlCommand("SELECT 1", conn))

cmd.ExecuteNonQuery();

scope.Complete();

}

// Case 2

using (var scope = new TransactionScope())

{

using (var conn1 = OpenConnection(csb))

using (var cmd = new NpgsqlCommand("SELECT 1", conn1))

cmd.ExecuteNonQuery();

using (var conn2 = OpenConnection(csb))

using (var cmd = new NpgsqlCommand("SELECT 1", conn2))

cmd.ExecuteNonQuery();

scope.Complete();

}

}

#region Utilities

void AssertNoPreparedTransactions()

=> Assert.That(GetNumberOfPreparedTransactions(), Is.EqualTo(0), "Prepared transactions found");

int GetNumberOfPreparedTransactions()

{

using var conn = OpenConnection(ConnectionStringEnlistOff);

using var cmd = new NpgsqlCommand("SELECT COUNT(*) FROM pg_prepared_xacts WHERE database = @database", conn);

cmd.Parameters.Add(new NpgsqlParameter("database", conn.Database));

return (int)(long)cmd.ExecuteScalar()!;

}

void AssertNumberOfRows(int expected)

=> Assert.That(_controlConn.ExecuteScalar(@"SELECT COUNT(*) FROM data"), Is.EqualTo(expected), "Unexpected data count");

static void AssertNoDistributedIdentifier()

=> Assert.That(Transaction.Current?.TransactionInformation.DistributedIdentifier ?? Guid.Empty, Is.EqualTo(Guid.Empty), "Distributed identifier found");

public readonly string ConnectionStringEnlistOn;

public readonly string ConnectionStringEnlistOff;

#endregion Utilities

#region Setup

public SystemTransactionTests()

{

ConnectionStringEnlistOn = new NpgsqlConnectionStringBuilder(ConnectionString) { Enlist = true }.ToString();

ConnectionStringEnlistOff = new NpgsqlConnectionStringBuilder(ConnectionString) { Enlist = false }.ToString();

}

NpgsqlConnection _controlConn = default!;

[OneTimeSetUp]

public void OneTimeSetUp()

{

_controlConn = OpenConnection();

// All tests in this fixture should have exclusive access to the database they're running on.

// If we run these tests in parallel (i.e. two builds in parallel) they will interfere.

// Solve this by taking a PostgreSQL advisory lock for the lifetime of the fixture.

_controlConn.ExecuteNonQuery("SELECT pg_advisory_lock(666)");

_controlConn.ExecuteNonQuery("DROP TABLE IF EXISTS data");

_controlConn.ExecuteNonQuery("CREATE TABLE data (name TEXT)");

}

[SetUp]

public void SetUp()

{

_controlConn.ExecuteNonQuery("TRUNCATE data");

}

#pragma warning disable CS8625

[OneTimeTearDown]

public void OneTimeTearDown()

{

_controlConn?.Close();

_controlConn = null;

}

#pragma warning restore CS8625

#endregion

}

}