public async Task Test_Bad_Service(CharGenClient_Rfc_864.ProtocolType protocol)
{
var host = new HostName("localhost");
var serverOptions = new CharGenServer_Rfc_864.ServerOptions()
{
LoggingLevel = CharGenServer_Rfc_864.ServerOptions.Verbosity.None
};
var clientOptions = new CharGenClient_Rfc_864.ClientOptions()
{
LoggingLevel = CharGenClient_Rfc_864.ClientOptions.Verbosity.None
};
using (var server = new CharGenServer_Rfc_864(serverOptions))
{
bool serverOk = await server.StartAsync();
if (!serverOk)
{
Infrastructure.Error($"unable to start server");
return;
}
var client = new CharGenClient_Rfc_864(clientOptions);
var result = await client.WriteAsync(host, "79", protocol, "WontCauseAnyTraffic");
Infrastructure.IfTrueError(result.Succeeded != CharGenClient_Rfc_864.CharGenResult.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})");
}
}
public async Task Test_Bad_Host(CharGenClient_Rfc_864.ProtocolType protocol)
{
var host = new HostName("invalid.host.doesnt.exist.example.com");
var clientOptions = new CharGenClient_Rfc_864.ClientOptions()
{
LoggingLevel = CharGenClient_Rfc_864.ClientOptions.Verbosity.None
};
var client = new CharGenClient_Rfc_864(clientOptions);
var result = await client.WriteAsync(host, "10013", protocol, "ABCDEF");
Infrastructure.IfTrueError(result.Succeeded != CharGenClient_Rfc_864.CharGenResult.State.Failed, "result.Succeeded ");
Infrastructure.IfTrueError(!String.IsNullOrEmpty(result.Value), "result.Value is not null");
Infrastructure.IfTrueError(result.Error != SocketErrorStatus.HostNotFound, $"result.Error is wrong ({result.Error})");
}
/// <summary>
/// System test, not a unit tests. Creates a server, pumps a bunch of requests at it,
/// and verifies that everything worked.
/// </summary>
/// <returns></returns>
public async Task Test_Stress(CharGenClient_Rfc_864.ProtocolType protocol)
{
string pname = protocol.ToString();
const int NLOOP = 4;
const int NBUNCH = 10;
const double ALLOWED_TIME = 20.0; // Normally we expect everything to be fast. No so much for a stress test!
const int ALLOWED_CONN_RESET = (NLOOP * NBUNCH) * 5 / 100; // Allow 5% conn reset
const int ALLOWED_EXCEPTION = (NLOOP * NBUNCH) * 5 / 100; // allow 5% exception on server
int NBytesWrite = 0;
int NConnReset = 0;
var host = new HostName("localhost");
var serverOptions = new CharGenServer_Rfc_864.ServerOptions()
{
OutputPattern = CharGenServer_Rfc_864.ServerOptions.PatternType.Fixed,
LoggingLevel = CharGenServer_Rfc_864.ServerOptions.Verbosity.None,
};
var clientOptions = new CharGenClient_Rfc_864.ClientOptions()
{
LoggingLevel = CharGenClient_Rfc_864.ClientOptions.Verbosity.None,
};
using (var server = new CharGenServer_Rfc_864(serverOptions))
{
bool serverOk = await server.StartAsync();
if (!serverOk)
{
Infrastructure.Error($"Client: Stress: {pname} unable to start server");
return;
}
var expected = CharGenServer_Rfc_864.GetSampleReturn();
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 CharGenClient_Rfc_864[NBUNCH];
var allWriteTasks = new Task <CharGenClient_Rfc_864.CharGenResult> [NBUNCH];
for (int i = 0; i < NBUNCH; i++)
{
var send = $"ABC-Loop {bigLoop} Item {i}"; // This is sent and ignored by the server.
NBytesWrite += send.Length;
allClients[i] = new CharGenClient_Rfc_864(clientOptions);
allWriteTasks[i] = allClients[i].WriteAsync(host, serverOptions.Service, protocol, send);
}
await Task.WhenAll(allWriteTasks);
await Task.Delay(100); //TODO: magic number
// TCP has to wait for the close to happen.
Task <CharGenClient_Rfc_864.CharGenResult>[] allCloseTasks = null;
if (protocol == CharGenClient_Rfc_864.ProtocolType.Tcp)
{
allCloseTasks = new Task <CharGenClient_Rfc_864.CharGenResult> [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 == CharGenClient_Rfc_864.ProtocolType.Tcp
? allCloseTasks[i].Result
: allWriteTasks[i].Result;
var didSucceed = result.Succeeded == CharGenClient_Rfc_864.CharGenResult.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)
{
double nreads = (double)result.Value.Length / (double)expected.Length;
int nreadsInt = (int)Math.Round(nreads);
Infrastructure.IfTrueError(nreadsInt == 0, $"Got no data back for {pname}");
Infrastructure.IfTrueError(nreadsInt != nreads, $"Got partial read {nreads} for {pname}");
Infrastructure.IfTrueError(nreads > 5, $"Got {nreads} reads for {pname}");
//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 == CharGenClient_Rfc_864.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 > ALLOWED_EXCEPTION, $"Server got {server.Stats.NExceptions} exceptions but expected no more than {ALLOWED_EXCEPTION} for {pname}");
}
}
