public void Test()
{
Assert.That(HDns.GetHostName(), Is.EqualTo(Dns.GetHostName()));
Assert.That(AreEqual(HDns.GetHostEntry("127.0.0.1"), Dns.GetHostEntry("127.0.0.1")), Is.True);
Assert.That(AreEqual(HDns.GetHostEntry("www.hazelcast.com"), Dns.GetHostEntry("www.hazelcast.com")), Is.True);
Assert.That(AreEqual(HDns.GetHostEntry(IPAddress.Parse("127.0.0.1")), Dns.GetHostEntry(IPAddress.Parse("127.0.0.1"))), Is.True);
Assert.That(AreEqual(HDns.GetHostAddresses("127.0.0.1"), Dns.GetHostAddresses("127.0.0.1")), Is.True);
Assert.That(AreEqual(HDns.GetHostAddresses("www.hazelcast.com"), Dns.GetHostAddresses("www.hazelcast.com")), Is.True);
}
public async Task SingleFailureAtAddressResolutionShouldNotBlowUpClient()
{
using var altDns = HDns.Override(new AltDns(2));
await using var client = await CreateAndStartClientAsync();
await Task.Delay(1000);
// client is still active and connected
Assert.That(client.IsActive);
Assert.That(client.IsConnected);
}
public async Task SingleFailureAtAddressResolutionShouldNotBlowUpClient()
{
using var _ = HConsoleForTest();
using var altDns = HDns.Override(new AltDns(2));
await using var client = await CreateAndStartClientAsync();
await AssertEx.SucceedsEventually(() =>
{
// client is active and connected
Assert.That(client.IsActive);
Assert.That(client.IsConnected);
}, 4000, 500);
await Task.Delay(1000);
// client is still active and connected
Assert.That(client.IsActive);
Assert.That(client.IsConnected);
}
public async Task SingleFailureAtAddressResolutionShouldNotBlowUpClient()
{
using var _ = HConsoleForTest();
HConsole.WriteLine(this, "Begin");
// the alt DNS will throw on the Nth invocation of GetHostAddresses
// the original test threw at '2' and that was when getting an address to connect to
// the original code & test was not resilient to failures in other places, either
//
// 1: getting an address to connect to
// 2: decoding the auth response (fatal)
// 3: decoding the members view event (fatal)
// ...
var altDns = new AltDns(1);
using var dnsOverride = HDns.Override(altDns);
await using var client = await CreateAndStartClientAsync(options =>
{
// make sure to use a hostname, not 127.0.0.1, to use the DNS
options.Networking.Addresses.Clear();
options.Networking.Addresses.Add("localhost:5701");
});
await AssertEx.SucceedsEventually(() =>
{
// client is active and connected
Assert.That(client.IsActive);
Assert.That(client.IsConnected);
}, 4000, 500);
await Task.Delay(1000);
// dns has been used
Assert.That(altDns.Count, Is.GreaterThan(0));
// client is still active and connected
Assert.That(client.IsActive);
Assert.That(client.IsConnected);
}
