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using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
namespace Microsoft.AspNet.NodeServices {
/**
* Class responsible for launching the Node child process, determining when it is ready to accept invocations,
* and finally killing it when the parent process exits. Also it restarts the child process if it dies.
*/
public abstract class OutOfProcessNodeInstance : INodeServices {
private object _childProcessLauncherLock;
private bool disposed;
private StringAsTempFile _entryPointScript;
private string _commandLineArguments;
private Process _nodeProcess;
private TaskCompletionSource<bool> _nodeProcessIsReadySource;
protected Process NodeProcess {
get {
// This is only exposed to support the unreliable OutOfProcessNodeRunner, which is just to verify that
// other hosting/transport mechanisms are possible. This shouldn't really be exposed.
return this._nodeProcess;
}
}
public OutOfProcessNodeInstance(string entryPointScript, string commandLineArguments = null)
{
this._childProcessLauncherLock = new object();
this._entryPointScript = new StringAsTempFile(entryPointScript);
this._commandLineArguments = commandLineArguments ?? string.Empty;
}
public abstract Task<string> Invoke(NodeInvocationInfo invocationInfo);
public Task<string> Invoke(string moduleName, params object[] args) {
return this.InvokeExport(moduleName, null, args);
}
public async Task<string> InvokeExport(string moduleName, string exportedFunctionName, params object[] args) {
return await this.Invoke(new NodeInvocationInfo {
ModuleName = moduleName,
ExportedFunctionName = exportedFunctionName,
Args = args
});
}
protected async Task EnsureReady() {
lock (this._childProcessLauncherLock) {
if (this._nodeProcess == null || this._nodeProcess.HasExited) {
var startInfo = new ProcessStartInfo("node") {
Arguments = this._entryPointScript.FileName + " " + this._commandLineArguments,
UseShellExecute = false,
RedirectStandardInput = true,
RedirectStandardOutput = true,
RedirectStandardError = true
};
// Append current directory to NODE_PATH so it can locate node_modules
var existingNodePath = Environment.GetEnvironmentVariable("NODE_PATH") ?? string.Empty;
if (existingNodePath != string.Empty) {
existingNodePath += ":";
}
var nodePathValue = existingNodePath + Path.Combine(Directory.GetCurrentDirectory(), "node_modules");
#if DNX451
startInfo.EnvironmentVariables.Add("NODE_PATH", nodePathValue);
#else
startInfo.Environment.Add("NODE_PATH", nodePathValue);
#endif
this.OnBeforeLaunchProcess();
this._nodeProcess = Process.Start(startInfo);
this.ConnectToInputOutputStreams();
}
}
var task = this._nodeProcessIsReadySource.Task;
var initializationSucceeded = task
.GetAwaiter()
.GetResult();
if (!initializationSucceeded) {
throw new InvalidOperationException("The Node.js process failed to initialize", task.Exception);
}
else {
Console.WriteLine("Started");
}
}
private void ConnectToInputOutputStreams() {
var initializationIsCompleted = false; // TODO: Make this thread-safe? (Interlocked.Exchange etc.)
this._nodeProcessIsReadySource = new TaskCompletionSource<bool>();
this._nodeProcess.OutputDataReceived += (sender, evt) => {
if (evt.Data == "[Microsoft.AspNet.NodeServices:Listening]" && !initializationIsCompleted) {
this._nodeProcessIsReadySource.SetResult(true);
initializationIsCompleted = true;
} else if (evt.Data != null) {
this.OnOutputDataReceived(evt.Data);
}
};
this._nodeProcess.ErrorDataReceived += (sender, evt) => {
if (evt.Data != null) {
this.OnErrorDataReceived(evt.Data);
if (!initializationIsCompleted) {
this._nodeProcessIsReadySource.SetResult(false);
initializationIsCompleted = true;
}
}
};
this._nodeProcess.BeginOutputReadLine();
this._nodeProcess.BeginErrorReadLine();
}
protected virtual void OnBeforeLaunchProcess() {
}
protected virtual void OnOutputDataReceived(string outputData) {
Console.WriteLine("[Node] " + outputData);
}
protected virtual void OnErrorDataReceived(string errorData) {
Console.WriteLine("[Node] " + errorData);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!disposed) {
if (disposing) {
this._entryPointScript.Dispose();
}
if (this._nodeProcess != null && !this._nodeProcess.HasExited) {
this._nodeProcess.Kill(); // TODO: Is there a more graceful way to end it? Or does this still let it perform any cleanup?
System.Console.WriteLine("Killed");
}
disposed = true;
}
}
~OutOfProcessNodeInstance() {
Dispose (false);
}
}
}