public static async Task <EchoClient_Rfc_862.EchoResult> RunTcpAsync()
{
// Hint: the using here means that the server is automatically closed
// after the code is done. If you don't do that, the server stays open.
using (var server = new EchoServer_Rfc_862())
{
await server.StartAsync();
var client = new EchoClient_Rfc_862();
// You only get the echo'd result from TCP with the final CloseAsync()
// But for UDP you get the returned packet.
var partialResult = await client.WriteAsync(
new Windows.Networking.HostName("localhost"),
server.Options.Service,
EchoClient_Rfc_862.ProtocolType.Tcp,
"Hello, echo server!");
// TODO: remove magic value?
// Wait for the echo to have worked. The server is right here, so the
// echo should be almost instantaneous.
await Task.Delay(100);
var completeResult = await client.CloseAsync(); // Close is essential for TCP.
return(completeResult);
}
}
public async Task Test_Bad_Service(EchoClient_Rfc_862.ProtocolType protocol)
{
var host = new HostName("localhost");
var serverOptions = new EchoServer_Rfc_862.ServerOptions()
{
LoggingLevel = EchoServer_Rfc_862.ServerOptions.Verbosity.None
};
var clientOptions = new EchoClient_Rfc_862.ClientOptions()
{
LoggingLevel = EchoClient_Rfc_862.ClientOptions.Verbosity.None
};
using (var server = new EchoServer_Rfc_862(serverOptions))
{
bool serverOk = await server.StartAsync();
if (!serverOk)
{
Infrastructure.Error($"unable to start server");
return;
}
var client = new EchoClient_Rfc_862(clientOptions);
var result = await client.WriteAsync(host, "79", protocol, "WontBeEchoed");
Infrastructure.IfTrueError(result.Succeeded != EchoClient_Rfc_862.EchoResult.State.Failed, "result.Succeeded ");
Infrastructure.IfTrueError(!String.IsNullOrEmpty(result.Value), "result.Value is not null");
// ConnectionRefused is for TCP
// ConnectionResetByPeer is for UDP
Infrastructure.IfTrueError(result.Error != SocketErrorStatus.ConnectionRefused && result.Error != SocketErrorStatus.ConnectionResetByPeer, $"result.Error is wrong ({result.Error})");
}
}
private void OnStartServers(object sender, RoutedEventArgs e)
{
var options = new EchoServer_Rfc_862.ServerOptions()
{
Service = uiService.Text,
};
Server = new EchoServer_Rfc_862(options);
Server.LogEvent += Server_LogEvent;
ServerTask = Server.StartAsync();
}
public async Task Test_Echo_Good_Path_Udp()
{
using (var server = new EchoServer_Rfc_862())
{
var client = new EchoClient_Rfc_862();
await server.StartAsync();
var result1 = await client.WriteAsync(new HostName("localhost"), server.Options.Service, EchoClient_Rfc_862.ProtocolType.Udp, "ABC");
Infrastructure.IfTrueError(result1.Succeeded != EchoClient_Rfc_862.EchoResult.State.Succeeded, "Close TCP status should be succeeded");
Infrastructure.IfTrueError(result1.Value != "ABC", $"Should have gotten back abcDEF123456, not {result1.Value}");
var result2 = await client.WriteAsync(new HostName("localhost"), server.Options.Service, EchoClient_Rfc_862.ProtocolType.Udp, "123");
Infrastructure.IfTrueError(result2.Succeeded != EchoClient_Rfc_862.EchoResult.State.Succeeded, "Close TCP status should be succeeded");
Infrastructure.IfTrueError(result2.Value != "123", $"Should have gotten back abcDEF123456, not {result2.Value}");
}
}
public static async Task <EchoClient_Rfc_862.EchoResult> RunUdpAsync()
{
// Hint: the using here means that the server is automatically closed
// after the code is done. If you don't do that, the server stays open.
using (var server = new EchoServer_Rfc_862())
{
await server.StartAsync();
var client = new EchoClient_Rfc_862();
var result = await client.WriteAsync(
new Windows.Networking.HostName("localhost"),
server.Options.Service,
EchoClient_Rfc_862.ProtocolType.Udp,
"Hello, echo server!");
await client.CloseAsync(); // Close is really needed for TCP.
return(result);
}
}
public async Task Test_Echo_Good_Path_Tcp()
{
using (var server = new EchoServer_Rfc_862())
{
var client = new EchoClient_Rfc_862();
await server.StartAsync();
var result1 = await client.WriteAsync(new HostName("localhost"), server.Options.Service, EchoClient_Rfc_862.ProtocolType.Tcp, "ABCdef");
Infrastructure.IfTrueError(result1.Succeeded != EchoClient_Rfc_862.EchoResult.State.InProgress, "TCP status should be in progress");
var result2 = await client.WriteAsync(new HostName("localhost"), server.Options.Service, EchoClient_Rfc_862.ProtocolType.Tcp, "123456");
Infrastructure.IfTrueError(result2.Succeeded != EchoClient_Rfc_862.EchoResult.State.InProgress, "TCP status should be in progress");
await Task.Delay(100); //TODO: artificial delay to get the results.
var result3 = await client.CloseAsync();
Infrastructure.IfTrueError(result3.Succeeded != EchoClient_Rfc_862.EchoResult.State.Succeeded, "Close TCP status should be succeeded");
Infrastructure.IfTrueError(result3.Value != "ABCdef123456", $"Should have gotten back abcDEF123456, not {result3.Value}");
}
}
/// <summary>
/// System test, not a unit tests. Creates a server, pumps a bunch of requests at it,
/// and verifies that everything worked.
/// </summary>
/// <returns></returns>
public async Task Test_Stress(EchoClient_Rfc_862.ProtocolType protocol)
{
string pname = protocol.ToString();
const int NLOOP = 4;
const int NBUNCH = 200;
const double ALLOWED_TIME = 20.0; // Normally we expect everything to be fast. No so much for a stress test!
const int ALLOWED_CONN_RESET = (NLOOP * NBUNCH) * 5 / 100; // Allow 5% conn reset
int NBytesWrite = 0;
int NConnReset = 0;
var host = new HostName("localhost");
var serverOptions = new EchoServer_Rfc_862.ServerOptions()
{
LoggingLevel = EchoServer_Rfc_862.ServerOptions.Verbosity.None,
};
var clientOptions = new EchoClient_Rfc_862.ClientOptions()
{
LoggingLevel = EchoClient_Rfc_862.ClientOptions.Verbosity.None,
};
using (var server = new EchoServer_Rfc_862(serverOptions))
{
bool serverOk = await server.StartAsync();
if (!serverOk)
{
Infrastructure.Error($"Client: Stress: {pname} unable to start server");
return;
}
var start = DateTimeOffset.UtcNow;
for (int bigLoop = 0; bigLoop < NLOOP; bigLoop++)
{
if (bigLoop % 100 == 0 && bigLoop > 0)
{
Infrastructure.Log($"Client: Stress: {pname} starting loop {bigLoop} of {NLOOP}");
}
var allClients = new EchoClient_Rfc_862[NBUNCH];
var allWriteTasks = new Task <EchoClient_Rfc_862.EchoResult> [NBUNCH];
for (int i = 0; i < NBUNCH; i++)
{
var send = $"ABC-Loop {bigLoop} Item {i}";
NBytesWrite += send.Length;
allClients[i] = new EchoClient_Rfc_862(clientOptions);
allWriteTasks[i] = allClients[i].WriteAsync(host, serverOptions.Service, protocol, send);
}
await Task.WhenAll(allWriteTasks);
// TCP has to wait for the close to happen.
Task <EchoClient_Rfc_862.EchoResult>[] allCloseTasks = null;
if (protocol == EchoClient_Rfc_862.ProtocolType.Tcp)
{
allCloseTasks = new Task <EchoClient_Rfc_862.EchoResult> [NBUNCH];
for (int i = 0; i < NBUNCH; i++)
{
allCloseTasks[i] = allClients[i].CloseAsync();
}
await Task.WhenAll(allCloseTasks);
}
for (int i = 0; i < NBUNCH; i++)
{
var result = protocol == EchoClient_Rfc_862.ProtocolType.Tcp
? allCloseTasks[i].Result
: allWriteTasks[i].Result;
var didSucceed = result.Succeeded == EchoClient_Rfc_862.EchoResult.State.Succeeded;
if (!didSucceed && result.Error == SocketErrorStatus.ConnectionResetByPeer)
{
// Connection reset by peer is an error only if we get a bunch of them.
NConnReset++;
Infrastructure.IfTrueError(NConnReset > ALLOWED_CONN_RESET, $"Too many connection resets {NConnReset}");
}
else if (!Infrastructure.IfTrueError(!didSucceed, $"!result.Succeeded with error {result.Error.ToString()} for {pname}"))
{
Infrastructure.IfTrueError(result.Value == null, "result.Value is null");
if (result.Value != null && (result.Value.Length < 10 || result.Value.Length > 60))
{
;
}
Infrastructure.IfTrueError(result.Value != null && (result.Value.Length < 10 || result.Value.Length > 60), $"result.Value is weird size ({result.Value.Length}) for {pname}");
}
Infrastructure.IfTrueError(result.TimeInSeconds < -1, $"result.TimeInSeconds too small {result.TimeInSeconds} for {pname}");
Infrastructure.IfTrueError(result.TimeInSeconds > ALLOWED_TIME, $"result.TimeInSeconds too large {result.TimeInSeconds} for {pname}");
}
await Task.Delay(300); //NOTE: pause just to make the test runs easier to figure out
}
// timing data
var delta = DateTimeOffset.UtcNow.Subtract(start).TotalSeconds;
double timePerCall = delta / (double)(NLOOP * NBUNCH);
Infrastructure.Log($"Stress test average time: {NLOOP} {NBUNCH} {timePerCall} for {pname}");
// How's the server doing?
const int ExpectedCount = NLOOP * NBUNCH;
Infrastructure.IfTrueError(server.Stats.NConnections != ExpectedCount, $"Server got {server.Stats.NConnections} connections but expected {ExpectedCount} for {pname}");
Infrastructure.IfTrueError(server.Stats.NResponses != ExpectedCount, $"Server sent {server.Stats.NResponses} responses but expected {ExpectedCount} for {pname}");
// Why is the expected not equal to the NBytesSent? Because TCP has a weird timing thing:
// the server has to close down reading from the client relatively quickly and can't waste
// time for the client to send bytes that probably won't come.
var expectedMinBytes = protocol == EchoClient_Rfc_862.ProtocolType.Udp ? NBytesWrite : NBytesWrite / 4;
Infrastructure.IfTrueError(server.Stats.NBytesRead > NBytesWrite, $"Server got {server.Stats.NBytesRead} bytes but expected {NBytesWrite} for {pname}");
Infrastructure.IfTrueError(server.Stats.NBytesRead < expectedMinBytes, $"Server got {server.Stats.NBytesRead} bytes but expected {NBytesWrite} with a minimum value of {expectedMinBytes} for {pname}");
Infrastructure.IfTrueError(server.Stats.NExceptions != 0, $"Server got {server.Stats.NExceptions} exceptions but expected {0} for {pname}");
}
}