/// <summary>
/// Connect the Client to the given host server.
/// </summary>
public bool Connect()
{
//Set the internal tcpClient object
tcpClient = new TcpClient();
//tcpClient.NoDelay = true; // again.. for nagles... and its entirely too much to explain.
try {
//we leave the Client connection synchronous, to avoid timing issue with writes
tcpClient.Connect(serverEndpoint);
//get the network stream
NetworkStream nStream = tcpClient.GetStream();
//asynchronously read data
ClientState state = new ClientState(tcpClient);
nStream.BeginRead(state.Buffer, 0, state.Buffer.Length, readCallback, state);
return true;
} catch (Exception e) {
//there was a problem connecting
Log.Error(e.ToString());
return false;
}
}
/// <summary>
/// A verification response has been returned.
/// </summary>
/// <param id="state">The state object of the response.</param>
private void verificationResponse(ClientState state)
{
SerializationEngine serializer = new SerializationEngine ();
Verification vResponse = (Verification)serializer.Deserialize(state.GetDataArray());
NodeID = vResponse.NodeID;
HostName = vResponse.HostName;
DPI = vResponse.DPI;
CPUCount = vResponse.CPUCount;
RunningJobs = vResponse.JobCount;
TotalMemory = vResponse.TotalMemory;
//make sure the assembly and domain listing is good
foreach (string assembly in loadedAssemblies)
{
if(!loadedAssemblies.Contains(assembly)){
loadedAssemblies.Add(assembly);
}
}
foreach (string domain in loadedDomains)
{
if (!loadedDomains.Contains(domain))
{
loadedDomains.Add(domain);
}
}
}
//----------------------Response Functions-----------------------//
/// <summary>
/// The sent message is of unknown type.
/// </summary>
/// <param id="state">The state object of the response.</param>
private void unknowMessageType(ClientState state)
{
//TODO: handle unknown message type
}
/// <summary>
/// A distributed job has completed succesfully and this is the response.
/// </summary>
/// <param id="state">The state object of the response.</param>
private void returnExecution(ClientState state)
{
SerializationEngine serializer = new SerializationEngine ();
ExecutionResult res = (ExecutionResult)serializer.Deserialize(state.GetDataArray());
DomainManager.ReturnExecution(res);
}
/// <summary>
/// Called when a denied execution response is sent.
/// </summary>
/// <param id="state">The state object of the response.</param>
private void deniedExecution(ClientState state)
{
//TODO: handle denied execution.
}
/// <summary>
/// called when an assembly load message is returned
/// </summary>
/// <param id="state">The state object of the response.</param>
private void assemblyLoaded(ClientState state)
{
assemblyLoadReset.Set();
}
/// <summary>
/// Callback fired after a read operation completed on the socket
/// </summary>
/// <param name="result">The result of the read.</param>
private void readCallback(IAsyncResult result)
{
//Who wrote this method? I'm not claiming it... nope.
int read = 0;
NetworkStream nStream = null;
try {
//get the network stream
nStream = tcpClient.GetStream();
//end the read
read = nStream.EndRead(result);
} catch (ObjectDisposedException e) {
Log.Error(e.ToString());
//if the Client has been disposed, we set read to 0 to allow cleanup of the TCPClient
read = 0;
} catch (System.IO.IOException e) {
//the client got disconnected, that is fine, we simply need to re open with the reconnect, that will happen with the verify interval
Log.Warning("Client: '" + tcpClient.Client.AddressFamily.ToString() + "' disconnected! Exception: " + e.ToString());
read = 0;
}
//get the server state object
ClientState state = (ClientState)result.AsyncState;
if (read > 0) {
state.PurgeBuffer(read);
//check if the message is fully recieved, if it is, create a new state object and pass that to the read,
// if not, continue the read with the same state object
if (state.IsFullyRecieved()) {
//need to redo all this below.. nto as efficient as I'd like
ClientState newState = new ClientState(state.Client);
byte[] excessData = state.CompleteAndTrim();
dispatch(state);
newState.PreSetData(excessData);
bool moreToProcess = newState.IsFullyRecieved();
if (moreToProcess) {
do {
//this is a terrible terrible process and needs to be rewritten.
ClientState newStateRepeat = new ClientState(state.Client);
newStateRepeat.PreSetData(excessData);
excessData = newStateRepeat.CompleteAndTrim();
dispatch(newStateRepeat);
newState.PreSetData(excessData);
} while (newState.IsFullyRecieved());
nStream.BeginRead(newState.Buffer, 0, ClientState.BufferSize, readCallback, newState);
} else {
nStream.BeginRead(newState.Buffer, 0, ClientState.BufferSize, readCallback, newState);
}
} else {
nStream.BeginRead(state.Buffer, 0, ClientState.BufferSize, readCallback, state);
}
} else {
//socket has been closed... handle it
//TODO: handle socket close
}
}
/// <summary>
/// Dispatches the recieved message to the appropriate object
/// </summary>
/// <param name="state">The state object to be dispatched.</param>
private void dispatch(ClientState state)
{
//first extract the message type from the message
string messageType = state.GetMessageType();
//if messageType is null we return the Unknowm message response
if (messageType == null) {
Write(MessageType.UNKOWN);
}
//find the corresponding message type in the listing and dispatch accordingly, or return Unknown message response
if (dispatchList.ContainsKey(messageType)) {
dispatchList[messageType].BeginInvoke(state, null, null);
} else {
Write(MessageType.UNKOWN);
}
}
/// <summary>
/// Callback fired after a read operation completed on the socket
/// </summary>
/// <param name="result">The result of the read.</param>
private void readCallback(IAsyncResult result)
{
//Who wrote this method? I'm not claiming it... nope.
int read = 0;
NetworkStream nStream = null;
try {
//get the network stream
nStream = tcpClient.GetStream();
//end the read
read = nStream.EndRead(result);
} catch (ObjectDisposedException e) {
Log.Error(e.ToString());
//if the Client has been disposed, we set read to 0 to allow cleanup of the TCPClient
read = 0;
} catch (System.IO.IOException e) {
//the client got disconnected, that is fine, we simply need to re open with the reconnect, that will happen with the verify interval
Log.Warning("Client: '" + tcpClient.Client.AddressFamily.ToString() + "' disconnected! Exception: " + e.ToString());
read = 0;
}
//get the server state object
ClientState state = (ClientState)result.AsyncState;
if (read > 0)
{
state.PurgeBuffer(read);
//check if the message is fully recieved, if it is, create a new state object and pass that to the read,
// if not, continue the read with the same state object
if (state.IsFullyRecieved())
{
//need to redo all this below.. nto as efficient as I'd like
ClientState newState = new ClientState(state.Client);
byte[] excessData = state.CompleteAndTrim();
dispatch(state);
newState.PreSetData(excessData);
bool moreToProcess = newState.IsFullyRecieved();
if (moreToProcess)
{
do
{
//this is a terrible terrible process and needs to be rewritten.
ClientState newStateRepeat = new ClientState(state.Client);
newStateRepeat.PreSetData(excessData);
excessData = newStateRepeat.CompleteAndTrim();
dispatch(newStateRepeat);
newState.PreSetData(excessData);
} while (newState.IsFullyRecieved());
nStream.BeginRead(newState.Buffer, 0, ClientState.BufferSize, readCallback, newState);
}
else
{
nStream.BeginRead(newState.Buffer, 0, ClientState.BufferSize, readCallback, newState);
}
}
else
{
nStream.BeginRead(state.Buffer, 0, ClientState.BufferSize, readCallback, state);
}
}
else
{
//socket has been closed... handle it
//TODO: handle socket close
}
}
