private IEnumerator <object> KeepAliveTask(ListenerContext context, Socket socket)
{
EndPoint localEp = socket.LocalEndPoint, remoteEp = socket.RemoteEndPoint;
var evtArgs = new ConnectionEventArgs(localEp, remoteEp);
if (SocketOpened != null)
{
SocketOpened(this, evtArgs);
}
try {
using (var adapter = new SocketDataAdapter(socket, true)) {
while (!adapter.IsDisposed && adapter.Socket.Connected)
{
var fTask = Scheduler.Start(RequestTask(context, adapter));
yield return(fTask);
if (fTask.Failed)
{
adapter.Dispose();
yield break;
}
}
}
} finally {
if (SocketClosed != null)
{
SocketClosed(this, evtArgs);
}
}
}
private IEnumerator <object> KeepAliveTask(ListenerContext context, IncomingConnection incomingConnection)
{
var socket = incomingConnection.Socket;
EndPoint localEp = socket.LocalEndPoint, remoteEp = socket.RemoteEndPoint;
var evtArgs = new ConnectionEventArgs(localEp, remoteEp);
var keepAliveStarted = DateTime.UtcNow;
if (SocketOpened != null)
{
SocketOpened(this, evtArgs);
}
int requestCount = 0;
try {
using (var adapter = new SocketDataAdapter(socket, true)) {
while (!adapter.IsDisposed && adapter.Socket.Connected)
{
var fTask = Scheduler.Start(RequestTask(context, adapter));
yield return(fTask);
requestCount += 1;
if (fTask.Failed)
{
adapter.Dispose();
yield break;
}
}
}
} finally {
var keepAliveEnded = DateTime.UtcNow;
if (SocketClosed != null)
{
SocketClosed(this, evtArgs);
}
if (Trace != null)
{
Trace(
String.Format(
"KA_START {0:0000.0}ms KA_LENGTH {1:00000.0}ms {2} REQ(S)",
(keepAliveStarted - incomingConnection.AcceptedWhenUTC).TotalMilliseconds,
(keepAliveEnded - keepAliveStarted).TotalMilliseconds,
requestCount
)
);
}
}
}
public void Dispose()
{
if (Data != null)
{
Data.Dispose();
Data = null;
}
if (_SendFuture != null)
{
_SendFuture.Dispose();
_SendFuture = null;
}
}
private IEnumerator <object> RequestTask(ListenerContext context, SocketDataAdapter adapter)
{
var startedWhen = DateTime.UtcNow;
bool successful = false;
try {
const int headerBufferSize = 1024 * 32;
const int bodyBufferSize = 1024 * 128;
const double requestLineTimeout = 5;
// RFC2616:
// Words of *TEXT MAY contain characters from character sets other than ISO-8859-1 [22]
// only when encoded according to the rules of RFC 2047 [14].
Encoding headerEncoding;
try {
headerEncoding = Encoding.GetEncoding("ISO-8859-1");
} catch {
headerEncoding = Encoding.ASCII;
}
Request request;
RequestBody body;
HeaderCollection headers;
long bodyBytesRead = 0;
long? expectedBodyLength = null;
var reader = new AsyncTextReader(adapter, headerEncoding, headerBufferSize, false);
string requestLineText;
while (true)
{
var fRequestLine = reader.ReadLine();
var fRequestOrTimeout = Scheduler.Start(new WaitWithTimeout(fRequestLine, requestLineTimeout));
yield return(fRequestOrTimeout);
if (fRequestOrTimeout.Failed)
{
if (!(fRequestOrTimeout.Error is TimeoutException))
{
OnRequestError(fRequestOrTimeout.Error);
}
yield break;
}
if (fRequestLine.Failed)
{
if (!(fRequestLine.Error is SocketDisconnectedException))
{
OnRequestError(fRequestLine.Error);
}
yield break;
}
requestLineText = fRequestLine.Result;
// RFC2616:
// In the interest of robustness, servers SHOULD ignore any empty line(s) received where a
// Request-Line is expected. In other words, if the server is reading the protocol stream
// at the beginning of a message and receives a CRLF first, it should ignore the CRLF.
if ((requestLineText != null) && (requestLineText.Trim().Length == 0))
{
continue;
}
break;
}
var requestLineParsed = DateTime.UtcNow;
headers = new HeaderCollection();
while (true)
{
var fHeaderLine = reader.ReadLine();
yield return(fHeaderLine);
if (String.IsNullOrWhiteSpace(fHeaderLine.Result))
{
break;
}
headers.Add(new Header(fHeaderLine.Result));
}
var headersParsed = DateTime.UtcNow;
var expectHeader = (headers.GetValue("Expect") ?? "").ToLowerInvariant();
var expectsContinue = expectHeader.Contains("100-continue");
string hostName;
if (headers.Contains("Host"))
{
hostName = String.Format("http://{0}", headers["Host"].Value);
}
else
{
var lep = (IPEndPoint)adapter.Socket.LocalEndPoint;
hostName = String.Format("http://{0}:{1}", lep.Address, lep.Port);
}
var requestLine = new RequestLine(hostName, requestLineText);
var remainingBytes = reader.DisposeAndGetRemainingBytes();
bodyBytesRead += remainingBytes.Count;
var connectionHeader = (headers.GetValue("Connection") ?? "").ToLowerInvariant();
var shouldKeepAlive =
((requestLine.Version == "1.1") || connectionHeader.Contains("keep-alive")) &&
!connectionHeader.Contains("close");
if (headers.Contains("Content-Length"))
{
expectedBodyLength = long.Parse(headers["Content-Length"].Value);
}
body = new RequestBody(remainingBytes, expectedBodyLength);
if (expectsContinue)
{
yield return(adapter.Write(Continue100, 0, Continue100.Length));
}
request = new Request(
this, adapter, shouldKeepAlive,
requestLine, headers, body
);
IncomingRequests.Enqueue(request);
var requestEnqueued = DateTime.UtcNow;
DateTime?requestBodyRead = null;
// FIXME: I think it's technically accepted to send a body without a content-length, but
// it seems to be impossible to make that work right.
if (expectedBodyLength.HasValue)
{
using (var bodyBuffer = BufferPool <byte> .Allocate(bodyBufferSize))
while (bodyBytesRead < expectedBodyLength.Value)
{
long bytesToRead = Math.Min(expectedBodyLength.Value - bodyBytesRead, bodyBufferSize);
if (bytesToRead <= 0)
{
break;
}
var fBytesRead = adapter.Read(bodyBuffer.Data, 0, (int)bytesToRead);
yield return(fBytesRead);
if (fBytesRead.Failed)
{
if (fBytesRead.Error is SocketDisconnectedException)
{
break;
}
body.Failed(fBytesRead.Error);
OnRequestError(fBytesRead.Error);
yield break;
}
var bytesRead = fBytesRead.Result;
bodyBytesRead += bytesRead;
body.Append(bodyBuffer.Data, 0, bytesRead);
}
requestBodyRead = DateTime.UtcNow;
}
body.Finish();
successful = true;
request.Timing = new Request.TimingData {
Line = (requestLineParsed - startedWhen),
Headers = (headersParsed - requestLineParsed),
Queue = (requestEnqueued - headersParsed),
Body = (requestBodyRead - requestEnqueued)
};
} finally {
if (!successful)
{
adapter.Dispose();
}
}
}