protected ServiceTesterBase()
{
_port = DisposablePort.GetPort();
CommunicationKernel = new MicrodotInitializer(
"",
new ConsoleLogLoggersModules()).Kernel;
}
/// <summary>
/// Find a non-occupied sequence of ports in range [from, to].
/// </summary>
/// <param name="retries">How many time to look into </param>
/// <param name="rangeFrom">Min value of port</param>
/// <param name="rangeTo">Max value of port</param>
/// <param name="sequence">How many ports sequentially we need to allocate</param>
public static DisposablePort GetPort(int retries, int rangeFrom, int rangeTo, int sequence)
{
uint totalNewSemExceptions = 0u;
var sw = Stopwatch.StartNew();
var random = new Random(Guid.NewGuid().GetHashCode());
for (int retry = 0; retry < retries; retry++)
{
var occupiedPorts = Occupied(); // work on up-to-date list of ports in every retry
var randomPort = random.Next(rangeFrom, rangeTo);
// Check the every port in the sequence isn't occupoed
bool freeRange = true;
for (int port = randomPort; port < randomPort + sequence; port++)
{
freeRange = freeRange && !occupiedPorts.Contains(port);
if (!freeRange)
{
break;
}
}
bool someOneElseWantThisPort = false;
if (freeRange)
{
// We need to avoid race condition between different App Domains and processes running in
// parallel and allocating the same port, especially the tests running in parallel.
// The semaphore is machine / OS wide, so the hope it is good enough.
var result = new DisposablePort(randomPort);
for (int port = randomPort; port < randomPort + sequence; port++)
{
var name = $"ServiceTester-{port}";
if (Semaphore.TryOpenExisting(name, out var _))
{
someOneElseWantThisPort = true;
}
else
{
try
{
var item = new Semaphore(1, 1, name);
result._semaphores.Add(item);
portMaintainer.TryAdd(item, DateTime.UtcNow);
if (port == randomPort)
{
IsHttpSysLocked(port);
}
}
catch (Exception e)
{
Console.WriteLine($"Failed to create semaphore for port: {port}, Exception: " + e.Message);
someOneElseWantThisPort = true;
totalNewSemExceptions++;
result.Dispose(); // also freeing already created semaphores
}
}
}
if (someOneElseWantThisPort == false)
{
Console.WriteLine($"Service Tester found a free port: {randomPort}. " +
$"After retries: {retry}. " +
$"Initially occupied ports: {occupiedPorts.Count}. " +
$"Port maintainer contains: {portMaintainer.Count}. " +
$"New semaphore exceptions: {totalNewSemExceptions}. " +
$"Total elapsed, ms: {sw.ElapsedMilliseconds}");
return(result);
}
}
}
throw new Exception($"Can't find free port in range: [{rangeFrom}-{rangeTo}]." +
$"Retries: {retries}. " +
$"Currently occupied ports: {Occupied().Count}. " +
$"Port maintainer contains: {portMaintainer.Count}. " +
$"New semaphore exceptions: {totalNewSemExceptions}. " +
$"Total elapsed, ms: {sw.ElapsedMilliseconds}." +
$"Process id: {Process.GetCurrentProcess().Id}");
}
protected ServiceTesterBase()
{
_port = DisposablePort.GetPort();
}
