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MailSlot.cs
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MailSlot.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
using System.Diagnostics;
namespace Statsd
{
static class NativeMailSlot
{
[DllImport("kernel32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern SafeFileHandle CreateFile(
string lpFileName,
uint dwDesiredAccess,
uint dwShareMode,
uint SecurityAttributes,
uint dwCreationDisposition,
uint dwFlagsAndAttributes,
int hTemplateFile
);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern SafeFileHandle CreateMailslot(string lpName, uint nMaxMessageSize,
uint lReadTimeout, IntPtr lpSecurityAttributes);
[DllImport("kernel32.dll")]
public static extern bool GetMailslotInfo(SafeFileHandle hMailslot, IntPtr lpMaxMessageSize,
IntPtr lpNextSize, IntPtr lpMessageCount, IntPtr lpReadTimeout);
[DllImport("kernel32.dll")]
public static extern bool WriteFile(SafeFileHandle hFile, byte[] lpBuffer,
uint nNumberOfBytesToWrite, out uint lpNumberOfBytesWritten,
[In] ref NativeOverlapped lpOverlapped);
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool CloseHandle(SafeFileHandle hObject);
[DllImport("kernel32.dll")]
public static extern bool ReadFile(IntPtr hFile, byte[] lpBuffer,
uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, IntPtr lpOverlapped);
}
public class MailSlotTransport : ITransport, IDisposable
{
private static string SLOTNAME = @"\\.\mailslot\afcollectorapi";
private static SafeFileHandle slotHandle = null;
private static FileStream fs = null;
private FileStream mailSlot
{
get
{
if (fs == null)
{
if (slotHandle == null || slotHandle.IsInvalid || slotHandle.IsClosed)
{
slotHandle = NativeMailSlot.CreateFile(SLOTNAME,
(uint)FileAccess.Write,
(uint)FileShare.ReadWrite,
0,
(uint)FileMode.Open,
(uint)FileAttributes.Normal,
0);
}
if (!slotHandle.IsInvalid)
{
fs = new FileStream(slotHandle, FileAccess.Write);
}
else
{
throw new Exception("MailSlot Handle is Invalid");
}
}
return fs;
}
}
public bool Ready
{
get
{
return mailSlot != null;
}
}
public bool Send(string mail)
{
try
{
UnicodeEncoding encoding = new UnicodeEncoding();
string data_string = string.Format("{0}:{1}:{2}", Process.GetCurrentProcess().Id, 3, mail);
byte[] data_bytes = encoding.GetBytes(data_string);
int byteCount = encoding.GetByteCount(data_string);
mailSlot.Write(data_bytes, 0, byteCount);
mailSlot.Flush();
Console.WriteLine("sending " + data_string);
}
catch (IOException ioe)
{
Debug.WriteLine(String.Format("{0} Exception caught.", ioe));
}
return true;
}
#region IDisposable Members
public void Close()
{
if (fs != null)
{
fs.Close();
fs = null;
}
else if (slotHandle != null && !slotHandle.IsInvalid)
{
slotHandle.Close();
}
}
public void Dispose()
{
this.Close();
}
#endregion
}
public class AFTransport : MailSlotTransport
{
private readonly UDPTransport udpClient = new UDPTransport();
public new bool Send(string message)
{
bool usingCollector = this.Ready;
bool retval = false;
if (usingCollector)
{
retval = base.Send(message);
}
else
{
retval = this.udpClient.Send(message);
}
return retval;
}
}
public class UDPTransport : ITransport
{
private readonly UdpClient udpClient = new UdpClient();
public string Hostname = "localhost";
public int Port = 8125;
public bool Send(string message)
{
var data = Encoding.Default.GetBytes(message + "\n");
udpClient.Send(data, data.Length, Hostname, Port);
return true;
}
}
}