/// <summary>
/// Instantiates a new MSBuild or MSBuildTaskHost process acting as a child node.
/// </summary>
internal bool CreateNode(HandshakeOptions hostContext, INodePacketFactory factory, INodePacketHandler handler, TaskHostConfiguration configuration)
{
ErrorUtilities.VerifyThrowArgumentNull(factory, "factory");
ErrorUtilities.VerifyThrow(!_nodeIdToPacketFactory.ContainsKey((int)hostContext), "We should not already have a factory for this context! Did we forget to call DisconnectFromHost somewhere?");
if (AvailableNodes == 0)
{
ErrorUtilities.ThrowInternalError("All allowable nodes already created ({0}).", _nodeContexts.Count);
return(false);
}
// Start the new process. We pass in a node mode with a node number of 2, to indicate that we
// want to start up an MSBuild task host node.
string commandLineArgs = $" /nologo /nodemode:2 /nodereuse:{ComponentHost.BuildParameters.EnableNodeReuse} ";
string msbuildLocation = GetMSBuildLocationFromHostContext(hostContext);
// we couldn't even figure out the location we're trying to launch ... just go ahead and fail.
if (msbuildLocation == null)
{
return(false);
}
CommunicationsUtilities.Trace("For a host context of {0}, spawning executable from {1}.", hostContext.ToString(), msbuildLocation ?? "MSBuild.exe");
// Make it here.
NodeContext context = GetNode
(
msbuildLocation,
commandLineArgs,
(int)hostContext,
this,
CommunicationsUtilities.GetHostHandshake(hostContext),
CommunicationsUtilities.GetClientHandshake(hostContext),
NodeContextTerminated
);
if (null != context)
{
_nodeContexts[hostContext] = context;
// Start the asynchronous read.
context.BeginAsyncPacketRead();
_activeNodes.Add((int)hostContext);
_noNodesActiveEvent.Reset();
return(true);
}
return(false);
}
/// <summary>
/// Magic number sent by the host to the client during the handshake.
/// Derived from the binary timestamp to avoid mixing binary versions,
/// Is64BitProcess to avoid mixing bitness, and enableNodeReuse to
/// ensure that a /nr:false build doesn't reuse clients left over from
/// a prior /nr:true build. The enableLowPriority flag is to ensure that
/// a build with /low:false doesn't reuse clients left over for a prior
/// /low:true build.
/// </summary>
/// <param name="enableNodeReuse">Is reuse of build nodes allowed?</param>
/// <param name="enableLowPriority">Is the build running at low priority?</param>
internal static long GetHostHandshake(bool enableNodeReuse, bool enableLowPriority)
{
CommunicationsUtilities.Trace("MSBUILDNODEHANDSHAKESALT=\"{0}\", msbuildDirectory=\"{1}\", enableNodeReuse={2}, enableLowPriority={3}", Traits.MSBuildNodeHandshakeSalt, BuildEnvironmentHelper.Instance.MSBuildToolsDirectory32, enableNodeReuse, enableLowPriority);
return(CommunicationsUtilities.GetHostHandshake(CommunicationsUtilities.GetHandshakeOptions(taskHost: false, nodeReuse: enableNodeReuse, lowPriority: enableLowPriority, is64Bit: EnvironmentUtilities.Is64BitProcess)));
}
/// <summary>
/// Returns the host handshake for this node endpoint
/// </summary>
protected override long GetHostHandshake()
{
return(CommunicationsUtilities.GetHostHandshake(CommunicationsUtilities.GetHandshakeOptions(taskHost: true)));
}
/// <summary>
/// Returns the host handshake for this node endpoint
/// </summary>
protected override long GetHostHandshake()
{
long hostHandshake = CommunicationsUtilities.GetHostHandshake(CommunicationsUtilities.GetCurrentTaskHostContext());
return(hostHandshake);
}