public async Task <ConnectionData> HandleConnection(bool allowCompilationRequests = true, CancellationToken cancellationToken = default(CancellationToken))
{
try
{
GenerationRequest request;
try
{
Log("Begin reading request.");
request = await GenerationRequest.ReadAsync(_stream, cancellationToken).ConfigureAwait(false);
ValidateGenerationRequest(request);
Log("End reading request.");
}
catch (Exception e)
{
LogException(e, "Error reading build request.");
return(new ConnectionData(CompletionReason.CompilationNotStarted));
}
if (request.ProtocolVersion != GenerationProtocolConstants.ProtocolVersion)
{
return(await HandleMismatchedVersionRequest(cancellationToken).ConfigureAwait(false));
}
else if (!string.Equals(request.CompilerHash, GenerationProtocolConstants.GetCommitHash(), StringComparison.OrdinalIgnoreCase))
{
return(await HandleIncorrectHashRequest(cancellationToken).ConfigureAwait(false));
}
else if (IsShutdownRequest(request))
{
return(await HandleShutdownRequest(cancellationToken).ConfigureAwait(false));
}
else if (!allowCompilationRequests)
{
return(await HandleRejectedRequest(cancellationToken).ConfigureAwait(false));
}
else
{
return(await HandleCompilationRequest(request, cancellationToken).ConfigureAwait(false));
}
}
finally
{
Close();
}
}
internal static async Task <GenerationResponse> RunServerGenerationCore(
List <string> arguments,
GenerationsPathsInfo buildPaths,
string pipeName,
string keepAlive,
int?timeoutOverride,
Func <string, string, bool, bool> tryCreateServerFunc,
CancellationToken cancellationToken)
{
if (pipeName == null)
{
return(new RejectedGenerationResponse());
}
if (buildPaths.TempDirectory == null)
{
return(new RejectedGenerationResponse());
}
// early check for the build hash. If we can't find it something is wrong; no point even trying to go to the server
if (string.IsNullOrWhiteSpace(GenerationProtocolConstants.GetCommitHash()))
{
return(new IncorrectHashGenerationResponse());
}
var clientDir = buildPaths.ClientDirectory;
var timeoutNewProcess = timeoutOverride ?? TimeOutMsNewProcess;
var timeoutExistingProcess = timeoutOverride ?? TimeOutMsExistingProcess;
Task <NamedPipeClientStream> pipeTask = null;
Mutex clientMutex = null;
var holdsMutex = false;
try
{
try
{
var clientMutexName = GetClientMutexName(pipeName);
clientMutex = new Mutex(initiallyOwned: true, name: clientMutexName, out holdsMutex);
}
catch
{
// The Mutex constructor can throw in certain cases. One specific example is docker containers
// where the /tmp directory is restricted. In those cases there is no reliable way to execute
// the server and we need to fall back to the command line.
//
// Example: https://github.com/dotnet/roslyn/issues/24124
return(new RejectedGenerationResponse());
}
if (!holdsMutex)
{
try
{
holdsMutex = clientMutex.WaitOne(timeoutNewProcess);
if (!holdsMutex)
{
return(new RejectedGenerationResponse());
}
}
catch (AbandonedMutexException)
{
holdsMutex = true;
}
}
// Check for an already running server
var serverMutexName = GetServerMutexName(pipeName);
bool wasServerRunning = WasServerMutexOpen(serverMutexName);
var timeout = wasServerRunning ? timeoutExistingProcess : timeoutNewProcess;
if (wasServerRunning || tryCreateServerFunc(clientDir, pipeName, false))
{
pipeTask = TryConnectToServerAsync(pipeName, timeout, cancellationToken);
}
}
finally
{
if (clientMutex != null)
{
if (holdsMutex)
{
clientMutex.ReleaseMutex();
}
clientMutex.Dispose();
}
}
if (pipeTask != null)
{
var pipe = await pipeTask.ConfigureAwait(false);
if (pipe != null)
{
var request = GenerationRequest.Create(buildPaths.WorkingDirectory,
buildPaths.TempDirectory,
GenerationProtocolConstants.GetCommitHash(),
arguments,
keepAlive);
return(await TryGeneration(pipe, request, cancellationToken).ConfigureAwait(false));
}
}
return(new RejectedGenerationResponse());
}