///////////////////////////////////////////////////////////////////////////
/**
* Standard constructor
*/
public RemoteConnection( Int32 ConnectionHandle,
AgentInfo NewRemoteAgentInfo,
RemoteConnectionInterfaceWrapper NewRemoteInterface )
: base(ConnectionHandle)
{
Info = NewRemoteAgentInfo;
Interface = NewRemoteInterface;
}
/**
* Used by an agent to open a remote connection to another agent. Remote
* connections are bi-directional and this routine, along with its pair,
* ConfirmRemoteConnection, are used to resolve all handshaking. Remote
* connections are used by Agents to work on Tasks for Jobs they're
* managing on behalf of a LocalConnection.
*/
public Int32 OpenRemoteConnection( string RequestingAgentName, Int32 ConnectionHandle, ELogFlags LoggingFlags, bool IsAssigned, DateTime AssignedTimestamp )
{
// Always wait until the agent is fully initialized
Initialized.WaitOne();
Int32 RemoteConnectionHandle = Constants.INVALID;
CreateTimings( LoggingFlags );
StartTiming( "OpenRemoteConn-Internal", true );
// Make sure we only have one thread in here at a time
lock( Connections )
{
// Reject any incoming remote connection if:
// we're in standalone mode
// of if the CPU is already busy
// or if a restart/exit has been requested
if( ( AgentApplication.Options.EnableStandaloneMode ) ||
( CurrentState == AgentState.Busy ) ||
( AgentIsShuttingDown ) )
{
return Constants.INVALID;
}
else
{
// Determine if this is a request for a connection or an assignment
if( IsAssigned )
{
// Make sure the assignment isn't stale
if( AssignedTimestamp <= LastAssignedTime )
{
return Constants.INVALID;
}
if( Connections.Count != 0 )
{
// If there are any active jobs running in which the owner is the instigator,
// meaning that this agent is connected directly to the instigator, reject
foreach( AgentJob Job in ActiveJobs.Values )
{
if( Job.OwnerIsInstigator )
{
return Constants.INVALID;
}
}
// Close any existing remote connections in favor of this incoming one
foreach( Connection ExistingConnection in Connections.Values )
{
if( ExistingConnection is RemoteConnection )
{
Log( EVerbosityLevel.Informative, ELogColour.Orange, "[Connection] Detected incoming assigned remote connection, closing existing remote connection" );
Hashtable OldInParameters = null;
Hashtable OldOutParameters = null;
CloseConnection( ExistingConnection.Handle, OldInParameters, ref OldOutParameters );
}
}
}
}
else
{
// For connection requests, any other connection at all will cause a rejection
if( Connections.Count != 0 )
{
return Constants.INVALID;
}
}
}
// First, ping the remote host to make sure we can talk to it,
// starting with verifying the Agent with the Coordinator
try
{
if( ( Coordinator != null ) &&
( CoordinatorResponding ) &&
( AgentApplication.Options.EnableStandaloneMode == false ) )
{
AgentInfo RequestingAgentInfo = null;
Hashtable RequestedConfiguration = new Hashtable();
RequestedConfiguration["Version"] = new Version( 0, 0, 0, 0 );
RequestedConfiguration["RequestingAgentName"] = Environment.MachineName;
List<AgentInfo> PotentialRemoteAgents = Coordinator.GetAvailableAgents( RequestedConfiguration );
foreach( AgentInfo NextAgentInfo in PotentialRemoteAgents )
{
if( NextAgentInfo.Name == RequestingAgentName )
{
RequestingAgentInfo = NextAgentInfo;
break;
}
}
if( RequestingAgentInfo != null )
{
Debug.Assert( RequestingAgentInfo.Configuration.ContainsKey( "IPAddress" ) );
string RequestingAgentIPAddress = RequestingAgentInfo.Configuration["IPAddress"].ToString();
ValidateHostName(RequestingAgentIPAddress);
// Now, ping the Agent
if( PingRemoteHost( RequestingAgentName, RequestingAgentIPAddress ) )
{
// Get the remote agent's interface object and wrap it
string RemoteAgentURL = String.Format( "tcp://{0}:{1}/SwarmAgent",
RequestingAgentIPAddress,
Properties.Settings.Default.AgentRemotingPort.ToString() );
Agent RequestingAgentInterface = ( Agent )Activator.GetObject( typeof( Agent ), RemoteAgentURL );
RemoteConnectionInterfaceWrapper WrappedRequestingAgentInterface = new RemoteConnectionInterfaceWrapper( ConnectionHandle, RequestingAgentName, RequestingAgentIPAddress, RequestingAgentInterface );
Log( EVerbosityLevel.Informative, ELogColour.Green, "[Connect] Remote agent connection object obtained: " + RequestingAgentName );
// Confirm the connection
try
{
// Send the connection GUID back to the requesting agent as
// confirmation that we've received the request and plan to
// accept it after the handshaking is complete
RemoteConnectionHandle = WrappedRequestingAgentInterface.ConfirmRemoteConnection( ConnectionHandle );
if( RemoteConnectionHandle >= 0 )
{
// Create the new remote connection object
RemoteConnection NewRemoteConnection = new RemoteConnection( ConnectionHandle,
RequestingAgentInfo,
WrappedRequestingAgentInterface );
// There are times we want to ensure no new connections are coming online
// where we'll lock the Connections dictionary (see MaintainCache). Note
// that we're already in the lock above...
Connections.Add( ConnectionHandle, NewRemoteConnection );
NewRemoteConnection.CurrentState = ConnectionState.CONNECTED;
// Update our state and ping the coordinator
CurrentState = AgentState.Working;
WorkingFor = RequestingAgentName;
if( IsAssigned )
{
// Successful assignment
LastAssignedTime = AssignedTimestamp;
}
PingCoordinator( true );
Log( EVerbosityLevel.Informative, ELogColour.Green, "[Connect] Remote agent connection confirmed: " + RequestingAgentName );
}
}
catch( Exception Ex )
{
Log( EVerbosityLevel.Informative, ELogColour.Red, "[Connect] OpenRemoteConnection: " + Ex.ToString() );
RemoteConnectionHandle = Constants.ERROR_EXCEPTION;
}
}
else
{
// Failed to ping, simply return with an appropriate error code
Log( EVerbosityLevel.Informative, ELogColour.Red, "[Connect] Failed to ping " + RequestingAgentName + " at " + RequestingAgentIPAddress + " to confirm the remote connection" );
RemoteConnectionHandle = Constants.ERROR_CONNECTION_NOT_FOUND;
}
}
else
{
// Failed to find the Agent info for the requesting Agent, simply return with an appropriate error code
Log( EVerbosityLevel.Informative, ELogColour.Red, "[Connect] Failed to lookup " + RequestingAgentName + " in the Coordinator" );
RemoteConnectionHandle = Constants.ERROR_CONNECTION_NOT_FOUND;
}
}
else
{
// Could not contact the Coordinator, simply return with an appropriate error code
Log( EVerbosityLevel.Informative, ELogColour.Red, "[Connect] Failed to contact the Coordinator" );
RemoteConnectionHandle = Constants.ERROR_CONNECTION_NOT_FOUND;
}
}
catch( Exception Ex )
{
Log( EVerbosityLevel.Verbose, ELogColour.Red, "[Connect] Remote agent connection failed: " + RequestingAgentName );
Log( EVerbosityLevel.Verbose, ELogColour.Red, "[Connect] Exception details: " + Ex.ToString() );
}
if( RemoteConnectionHandle < 0 )
{
// If we get here, we have failed to create the connection
Log( EVerbosityLevel.Informative, ELogColour.Red, "[Connect] Remote agent connection failed: " + RequestingAgentName );
}
StopTiming();
}
return RemoteConnectionHandle;
}
/**
* Used internally to try to open connections to remote agents
*/
public Int32 TryOpenRemoteConnection( LocalConnection ParentConnection, AgentInfo RemoteAgentInfo, bool IsAssigned, DateTime AssignedTimestamp, out RemoteConnection OpenedRemoteConnection )
{
// Initialize the return values
Int32 ErrorCode = Constants.INVALID;
OpenedRemoteConnection = null;
string RemoteAgentName = RemoteAgentInfo.Name;
string RemoteAgentIPAddress = RemoteAgentInfo.Configuration["IPAddress"].ToString();
Log( EVerbosityLevel.Verbose, ELogColour.Green, "[Connect] Trying to open a remote connection to " + RemoteAgentName + " at " + RemoteAgentIPAddress );
bool bHostNameValid = true;
try
{
ValidateHostName(RemoteAgentIPAddress);
}
catch (Exception)
{
ErrorCode = Constants.ERROR_EXCEPTION;
bHostNameValid = false;
}
// First, ping the remote host to make sure we can talk to it
if (bHostNameValid && PingRemoteHost(RemoteAgentName, RemoteAgentIPAddress))
{
// Get the new unique handle that this connection will be known by
Int32 NewConnectionHandle = GetUniqueHandle();
// Get the remote Agent interface object
string RemoteAgentURL = String.Format( "tcp://{0}:{1}/SwarmAgent",
RemoteAgentIPAddress,
Properties.Settings.Default.AgentRemotingPort.ToString() );
Agent RemoteAgentInterface = ( Agent )Activator.GetObject( typeof( Agent ), RemoteAgentURL );
RemoteConnectionInterfaceWrapper WrappedRemoteAgentInterface = new RemoteConnectionInterfaceWrapper( NewConnectionHandle, RemoteAgentName, RemoteAgentIPAddress, RemoteAgentInterface );
Log( EVerbosityLevel.Verbose, ELogColour.Green, "[Connect] Remote agent interface object obtained for " + RemoteAgentName + " at " + RemoteAgentIPAddress );
// With the interface in hand, try to open a bi-directional connection.
// Create the new RemoteConnection object and add it to the set
// of pending connections, waiting for the incoming confirmation
// which will move it to the active connection set. See
// ConfirmRemoteConnection for where this happens.
RemoteConnection NewRemoteConnection = new RemoteConnection( NewConnectionHandle,
RemoteAgentInfo,
WrappedRemoteAgentInterface );
PendingConnections.Add( NewConnectionHandle, NewRemoteConnection );
// Try to open the connection
try
{
// Send the connection handle and the machine name that will
// be used to construct the return URL for bi-directional
// connection
if( WrappedRemoteAgentInterface.OpenRemoteConnection( Environment.MachineName, NewConnectionHandle, LoggingFlags, IsAssigned, AssignedTimestamp ) >= 0 )
{
// Successful confirmation, double check that the connection has moved
if( PendingConnections.ContainsKey( NewConnectionHandle ) == false )
{
if( Connections.ContainsKey( NewConnectionHandle ) )
{
// Connection was successfully moved to the active connection set
// thus the bi-directional communication link is established
Log( EVerbosityLevel.Informative, ELogColour.Green, "[Connect] Successfully opened a remote connection with " + RemoteAgentName );
// Establish the parent-child relationship
NewRemoteConnection.Parent = ParentConnection;
NewRemoteConnection.Job = ParentConnection.Job;
ParentConnection.RemoteChildren.Add( NewConnectionHandle, NewRemoteConnection );
ParentConnection.RemoteChildrenSeen++;
ParentConnection.ChildrenSeen++;
// Update the visualizer indicating that another remote connection is online
if( NewRemoteConnection.Job.OwnerIsInstigator )
{
AgentApplication.UpdateMachineState( RemoteAgentName, -1, EProgressionState.RemoteConnected );
}
// Return the new handle for this connection
OpenedRemoteConnection = NewRemoteConnection;
ErrorCode = Constants.SUCCESS;
}
else
{
// Woah. Bad news.
}
}
}
else
{
// The connection failed to open, but didn't timeout and die, so it's likely just busy.
// Return with a success code, but with no remote agent, signaling that it's possible
// to try this one again later.
ErrorCode = Constants.SUCCESS;
}
}
catch( Exception Ex )
{
Log( EVerbosityLevel.Verbose, ELogColour.Red, "[Connect] Exception: " + RemoteAgentName + ": " + Ex.ToString() );
ErrorCode = Constants.ERROR_EXCEPTION;
}
if( ErrorCode < 0 )
{
Log( EVerbosityLevel.Verbose, ELogColour.Red, "[Connect] Failed to open a remote connection with " + RemoteAgentName );
}
// Regardless of how we got here, make sure the connection has been removed
// from the pending set (this is a safe call to make anytime)
PendingConnections.Remove( NewConnectionHandle );
}
else
{
// Failed to ping, simply return with an appropriate error code
ErrorCode = Constants.ERROR_CONNECTION_NOT_FOUND;
}
return ErrorCode;
}
