public void ConnectToServerFails()
{
// Create and grab the mutex for the server. This should make
// the client believe that a server is active and it will try
// to connect. When it fails it should fall back to in-proc
// compilation.
bool holdsMutex;
using (var serverMutex = new Mutex(initiallyOwned: true,
name: DesktopBuildClient.GetServerMutexName(_pipeName),
createdNew: out holdsMutex))
{
Assert.True(holdsMutex);
var ranLocal = false;
// Note: Connecting to a server can take up to a second to time out
var client = CreateClient(
compileFunc: delegate
{
ranLocal = true;
return(0);
});
var exitCode = client.RunCompilation(new[] { "/shared" }, _buildPaths).ExitCode;
Assert.Equal(0, exitCode);
Assert.True(ranLocal);
}
}
protected override int RunServerCore(string pipeName, IClientConnectionHost connectionHost, IDiagnosticListener listener, TimeSpan?keepAlive, CancellationToken cancellationToken)
{
// Grab the server mutex to prevent multiple servers from starting with the same
// pipename and consuming excess resources. If someone else holds the mutex
// exit immediately with a non-zero exit code
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
bool holdsMutex;
using (var serverMutex = new Mutex(initiallyOwned: true,
name: mutexName,
createdNew: out holdsMutex))
{
if (!holdsMutex)
{
return(CommonCompiler.Failed);
}
try
{
return(base.RunServerCore(pipeName, connectionHost, listener, keepAlive, cancellationToken));
}
finally
{
serverMutex.ReleaseMutex();
}
}
}
internal static ServerData CreateServer(
string pipeName = null,
TimeSpan?timeout = null,
ICompilerServerHost compilerServerHost = null,
IClientConnectionHost clientConnectionHost = null)
{
pipeName = pipeName ?? Guid.NewGuid().ToString();
compilerServerHost = compilerServerHost ?? new DesktopCompilerServerHost(DefaultClientDirectory, DefaultSdkDirectory);
var serverStatsSource = new TaskCompletionSource <ServerStats>();
var serverListenSource = new TaskCompletionSource <bool>();
var cts = new CancellationTokenSource();
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
var thread = new Thread(_ =>
{
var listener = new TestableDiagnosticListener();
listener.Listening += (sender, e) => { serverListenSource.TrySetResult(true); };
try
{
clientConnectionHost = clientConnectionHost ?? new NamedPipeClientConnectionHost(compilerServerHost, pipeName);
DesktopBuildServerController.RunServer(
pipeName,
clientConnectionHost,
listener,
timeout ?? TimeSpan.FromMilliseconds(-1),
cts.Token);
}
finally
{
var serverStats = new ServerStats(connections: listener.ConnectionCount, completedConnections: listener.CompletedCount);
serverStatsSource.SetResult(serverStats);
}
});
thread.Start();
// The contract of this function is that it will return once the server has started. Spin here until
// we can verify the server has started or simply failed to start.
while (DesktopBuildClient.WasServerMutexOpen(mutexName) != true && thread.IsAlive)
{
Thread.Yield();
}
return(new ServerData(cts, pipeName, serverStatsSource.Task, serverListenSource.Task));
}
public void MutexAcquiredWhenRunningServer()
{
var pipeName = Guid.NewGuid().ToString("N");
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
var host = new Mock <IClientConnectionHost>(MockBehavior.Strict);
host
.Setup(x => x.CreateListenTask(It.IsAny <CancellationToken>()))
.Returns(() =>
{
// Use a thread instead of Task to guarantee this code runs on a different
// thread and we can validate the mutex state.
var source = new TaskCompletionSource <bool>();
var thread = new Thread(_ =>
{
Mutex mutex = null;
try
{
Assert.True(Mutex.TryOpenExisting(mutexName, out mutex));
Assert.False(mutex.WaitOne(millisecondsTimeout: 0));
source.SetResult(true);
}
catch (Exception ex)
{
source.SetException(ex);
throw;
}
finally
{
mutex?.Dispose();
}
});
// Synchronously wait here. Don't returned a Task value because we need to
// ensure the above check completes before the server hits a timeout and
// releases the mutex.
thread.Start();
source.Task.Wait();
return(new TaskCompletionSource <IClientConnection>().Task);
});
var result = DesktopBuildServerController.RunServer(pipeName, host.Object, keepAlive: TimeSpan.FromSeconds(1));
Assert.Equal(CommonCompiler.Succeeded, result);
}
public async Task ServerShutdownsDuringProcessing()
{
using (var readyMre = new ManualResetEvent(initialState: false))
using (var doneMre = new ManualResetEvent(initialState: false))
{
var pipeName = Guid.NewGuid().ToString();
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
bool created = false;
bool connected = false;
var thread = new Thread(() =>
{
using (var stream = new NamedPipeServerStream(pipeName))
{
var mutex = new Mutex(initiallyOwned: true, name: mutexName, createdNew: out created);
readyMre.Set();
stream.WaitForConnection();
connected = true;
// Client is waiting for a response. Close the mutex now. Then close the connection
// so the client gets an error.
mutex.ReleaseMutex();
mutex.Dispose();
stream.Close();
doneMre.WaitOne();
}
});
// Block until the mutex and named pipe is setup.
thread.Start();
readyMre.WaitOne();
var exitCode = await RunShutdownAsync(pipeName, waitForProcess : false);
// Let the fake server exit.
doneMre.Set();
thread.Join();
Assert.Equal(CommonCompiler.Succeeded, exitCode);
Assert.True(connected);
Assert.True(created);
}
}
public async Task NoServerConnection()
{
using (var readyMre = new ManualResetEvent(initialState: false))
using (var doneMre = new ManualResetEvent(initialState: false))
{
var pipeName = Guid.NewGuid().ToString();
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
bool created = false;
bool connected = false;
var thread = new Thread(() =>
{
using (var mutex = new Mutex(initiallyOwned: true, name: mutexName, createdNew: out created))
using (var stream = new NamedPipeServerStream(pipeName))
{
readyMre.Set();
// Get a client connection and then immediately close it. Don't give any response.
stream.WaitForConnection();
connected = true;
stream.Close();
doneMre.WaitOne();
mutex.ReleaseMutex();
}
});
// Block until the mutex and named pipe is setup.
thread.Start();
readyMre.WaitOne();
var exitCode = await RunShutdownAsync(pipeName, waitForProcess : false);
// Let the fake server exit.
doneMre.Set();
thread.Join();
Assert.Equal(CommonCompiler.Failed, exitCode);
Assert.True(connected);
Assert.True(created);
}
}
/// <summary>
/// Create a compiler server that fails all connections.
/// </summary>
internal static ServerData CreateServerFailsConnection(string pipeName = null)
{
pipeName = pipeName ?? Guid.NewGuid().ToString();
var taskSource = new TaskCompletionSource <ServerStats>();
var cts = new CancellationTokenSource();
using (var mre = new ManualResetEvent(initialState: false))
{
var thread = new Thread(_ =>
{
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
bool holdsMutex;
using (var serverMutex = new Mutex(initiallyOwned: true,
name: mutexName,
createdNew: out holdsMutex))
{
mre.Set();
if (!holdsMutex)
{
throw new InvalidOperationException("Mutex should be unique");
}
var connections = CreateServerFailsConnectionCore(pipeName, cts.Token).Result;
taskSource.SetResult(new ServerStats(connections: connections, completedConnections: 0));
}
});
thread.Start();
// Can't exit until the mutex is acquired. Otherwise the client can end up in a race
// condition trying to start the server.
mre.WaitOne();
}
return(new ServerData(cts, pipeName, taskSource.Task, Task.FromException(new Exception())));
}
public void MutexStopsServerStarting()
{
var pipeName = Guid.NewGuid().ToString("N");
var mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
bool holdsMutex;
using (var mutex = new Mutex(initiallyOwned: true,
name: mutexName,
createdNew: out holdsMutex))
{
Assert.True(holdsMutex);
try
{
var host = new Mock <IClientConnectionHost>(MockBehavior.Strict);
var result = DesktopBuildServerController.RunServer(pipeName, host.Object, keepAlive: null);
Assert.Equal(CommonCompiler.Failed, result);
}
finally
{
mutex.ReleaseMutex();
}
}
}
protected override bool?WasServerRunning(string pipeName)
{
string mutexName = DesktopBuildClient.GetServerMutexName(pipeName);
return(DesktopBuildClient.WasServerMutexOpen(mutexName));
}
