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restemplate/indy/Core/IdCustomTCPServer.pas

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{
$Project$
$Workfile$
$Revision$
$DateUTC$
$Id$
This file is part of the Indy (Internet Direct) project, and is offered
under the dual-licensing agreement described on the Indy website.
(http://www.indyproject.org/)
Copyright:
(c) 1993-2005, Chad Z. Hower and the Indy Pit Crew. All rights reserved.
}
{
$Log$
}
{
Rev 1.1 1/15/05 2:23:00 PM RLebeau
Comment added to SetScheduler()
Rev 1.0 12/2/2004 3:26:32 PM JPMugaas
Moved most of TIdTCPServer here so we can use TIdTCPServer as an end point
which requires an OnExecute event.
Rev 1.68 11/29/04 11:50:26 PM RLebeau
Updated ContextDisconected() to call DoDisconnect()
Rev 1.67 11/27/04 3:28:36 AM RLebeau
Updated to automatically set up the client IOHandler before calling
DoConnect(), and to tear the IOHandler down before calling OnDisconnect().
Rev 1.66 10/8/2004 10:11:02 PM BGooijen
uncommented intercept code
Rev 1.65 2004.08.13 10:55:38 czhower
Removed IFDEF
Rev 1.64 08.08.2004 10:43:10 OMonien
temporary Thread.priority fix for Kylix
Rev 1.63 6/11/2004 12:41:52 PM JPMugaas
Reuse Address now reenabled.
Rev 1.62 6/1/2004 1:22:28 PM DSiders
Added TODO for TerminateWaitTimeout.
Rev 1.61 28/04/2004 15:54:40 HHariri
Changed thread priority for scheduler
Rev 1.60 2004.04.22 11:44:48 PM czhower
Boosted thread priority of listener thread.
Rev 1.59 2004.03.06 10:40:34 PM czhower
Changed IOHandler management to fix bug in server shutdowns.
Rev 1.58 2004.03.01 5:12:40 PM czhower
-Bug fix for shutdown of servers when connections still existed (AV)
-Implicit HELP support in CMDserver
-Several command handler bugs
-Additional command handler functionality.
Rev 1.57 2004.02.03 4:16:56 PM czhower
For unit name changes.
Rev 1.56 2004.01.20 10:03:36 PM czhower
InitComponent
Rev 1.55 1/3/2004 11:49:30 PM BGooijen
the server creates a default binding for IPv6 now too, if IPv6 is supported
Rev 1.54 2003.12.28 8:04:54 PM czhower
Shutdown fix for .net.
Rev 1.53 2003.11.29 6:03:46 PM czhower
Active = True now works when set at design time.
Rev 1.52 2003.10.21 12:19:02 AM czhower
TIdTask support and fiber bug fixes.
Rev 1.51 2003.10.18 9:33:30 PM czhower
Boatload of bug fixes to command handlers.
Rev 1.50 2003.10.18 8:04:28 PM czhower
Fixed bug with setting active at design time.
Rev 1.49 10/15/2003 11:10:00 PM DSiders
Added localization comments.
Added resource srting for exception raised in TIdTCPServer.SetScheduler.
Rev 1.48 2003.10.15 4:34:38 PM czhower
Bug fix for shutdown.
Rev 1.47 2003.10.14 11:18:12 PM czhower
Fix for AV on shutdown and other bugs
Rev 1.46 2003.10.11 5:51:38 PM czhower
-VCL fixes for servers
-Chain suport for servers (Super core)
-Scheduler upgrades
-Full yarn support
Rev 1.45 10/5/2003 9:55:26 PM BGooijen
TIdTCPServer works on D7 and DotNet now
Rev 1.44 10/5/2003 03:07:48 AM JPMugaas
Should compile.
Rev 1.43 2003.10.01 9:11:28 PM czhower
.Net
Rev 1.42 2003.09.30 1:23:08 PM czhower
Stack split for DotNet
Rev 1.41 2003.09.19 10:11:22 PM czhower
Next stage of fiber support in servers.
Rev 1.40 2003.09.19 11:54:34 AM czhower
-Completed more features necessary for servers
-Fixed some bugs
Rev 1.39 2003.09.18 4:43:18 PM czhower
-Removed IdBaseThread
-Threads now have default names
Rev 1.37 7/6/2003 8:04:10 PM BGooijen
Renamed IdScheduler* to IdSchedulerOf*
Rev 1.36 2003.06.30 9:41:06 PM czhower
Fix for AV during server shut down.
Rev 1.35 6/25/2003 3:57:58 PM BGooijen
Disconnecting the context is now inside try...except
Rev 1.34 6/8/2003 2:13:02 PM BGooijen
Made ContextClass public
Rev 1.33 6/5/2003 12:43:26 PM BGooijen
changed short circuit fix code
Rev 1.32 2003.06.04 10:14:08 AM czhower
Removed short circuit dependency and fixed some older irrelevant code.
Rev 1.31 6/3/2003 11:49:38 PM BGooijen
removed AV in TIdTCPServer.DoExecute (hopefully)
Rev 1.30 5/26/2003 04:29:58 PM JPMugaas
Removed GenerateReply and ParseReply. Those are now obsolete duplicate
functions in the new design.
Rev 1.29 2003.05.26 10:35:26 PM czhower
Fixed spelling typo.
Rev 1.28 5/26/2003 12:20:00 PM JPMugaas
Rev 1.27 2003.05.26 11:38:22 AM czhower
Rev 1.26 5/25/2003 03:38:04 AM JPMugaas
Rev 1.25 5/25/2003 03:26:38 AM JPMugaas
Rev 1.24 5/20/2003 12:43:52 AM BGooijen
changeable reply types
Rev 1.23 5/13/2003 2:56:40 PM BGooijen
changed GetGreating to SendGreeting
Rev 1.21 4/4/2003 8:09:46 PM BGooijen
moved some consts tidcmdtcpserver, changed DoExecute to return
.connection.connected
Rev 1.20 3/25/2003 9:04:06 PM BGooijen
Scheduler in IOHandler is now updated when the scheduler is removed
Rev 1.19 3/23/2003 11:33:34 PM BGooijen
Updates the scheduler in the iohandler when scheduler/iohandler is changed
Rev 1.18 3/22/2003 11:44:08 PM BGooijen
ServerIntercept now logs connects/disconnects
Rev 1.17 3/22/2003 1:46:02 PM BGooijen
Better handling of exceptions in TIdListenerThread.Run (could cause mem leaks
first (in non-paged-memory))
Rev 1.16 3/21/2003 5:55:54 PM BGooijen
Added code for serverIntercept
Rev 1.15 3/21/2003 11:44:00 AM JPMugaas
Updated with a OnBeforeConnect event for the TIdMappedPort components.
Rev 1.14 3/20/2003 12:18:32 PM BGooijen
Moved ReplyExceptionCode from TIdTCPServer to TIdCmdTCPServer
Rev 1.13 3/13/2003 10:18:26 AM BGooijen
Server side fibers, bug fixes
Rev 1.12 2003.02.18 5:52:16 PM czhower
Fix for warnings and logic error.
Rev 1.11 1/23/2003 8:33:16 PM BGooijen
Rev 1.10 1/23/2003 11:05:48 AM BGooijen
Rev 1.9 1/20/2003 12:50:44 PM BGooijen
Added a Contexts propperty, which contains all contexts for that server
Moved the commandhandlers to TIdCmdTCPServer
Rev 1.8 1-18-2003 0:00:30 BGooijen
Removed TIdContext.OnCreate
Added ContextCreated
Rev 1.7 1-17-2003 23:44:32 BGooijen
added support code for TIdContext.OnCreate
Rev 1.6 1-17-2003 22:22:10 BGooijen
new design
Rev 1.5 1-10-2003 23:59:22 BGooijen
Connection is now freed in destructor of TIdContext
Rev 1.4 1-10-2003 19:46:22 BGooijen
The context was not freed, now it is
Rev 1.3 1-9-2003 11:52:28 BGooijen
changed construction of TIdContext to Create(AServer: TIdTCPServer)
added TIdContext property .Server
Rev 1.2 1-3-2003 19:05:56 BGooijen
added FContextClass:TIdContextClass to TIdTcpServer
added Data:TObject to TIdContext
Rev 1.1 1-1-2003 16:42:10 BGooijen
Changed TIdThread to TIdYarn
Added TIdContext
Rev 1.0 11/13/2002 09:00:42 AM JPMugaas
2002-01-01 - Andrew P.Rybin
- bug fix (MaxConnections, SetActive(FALSE)), TerminateListenerThreads, DoExecute
2002-04-17 - Andrew P.Rybin
- bug fix: if exception raised in OnConnect, Threads.Remove and ThreadMgr.ReleaseThread are not called
}
unit IdCustomTCPServer;
{
Original Author and Maintainer:
- Chad Z. Hower a.k.a Kudzu
}
interface
{$I IdCompilerDefines.inc}
//here to flip FPC into Delphi mode
uses
Classes,
{$IFDEF HAS_UNIT_Generics_Collections}
System.Generics.Collections,
{$ENDIF}
IdBaseComponent,
IdComponent,IdContext, IdGlobal, IdException,
IdIntercept, IdIOHandler, IdIOHandlerStack,
IdReply, IdScheduler, IdSchedulerOfThread, IdServerIOHandler,
IdServerIOHandlerStack, IdSocketHandle, IdStackConsts, IdTCPConnection,
IdThread, IdYarn, SysUtils;
const
IdListenQueueDefault = 15;
type
TIdCustomTCPServer = class;
// This is the thread that listens for incoming connections and spawns
// new ones to handle each one
TIdListenerThread = class(TIdThread)
protected
FBinding: TIdSocketHandle;
FServer: TIdCustomTCPServer;
FOnBeforeRun: TIdNotifyThreadEvent;
//
procedure AfterRun; override;
procedure BeforeRun; override;
procedure Run; override;
public
constructor Create(AServer: TIdCustomTCPServer; ABinding: TIdSocketHandle); reintroduce;
//
property Binding: TIdSocketHandle read FBinding;
property Server: TIdCustomTCPServer read FServer;
property OnBeforeRun: TIdNotifyThreadEvent read FOnBeforeRun write FOnBeforeRun;
End;
{$IFDEF HAS_GENERICS_TThreadList}
TIdListenerThreadList = TThreadList<TIdListenerThread>;
TIdListenerList = TList<TIdListenerThread>;
{$ELSE}
// TODO: flesh out to match TThreadList<TIdListenerThread> and TList<TIdListenerThread> for non-Generics compilers
TIdListenerThreadList = TThreadList;
TIdListenerList = TList;
{$ENDIF}
TIdListenExceptionEvent = procedure(AThread: TIdListenerThread; AException: Exception) of object;
TIdServerThreadExceptionEvent = procedure(AContext: TIdContext; AException: Exception) of object;
TIdServerThreadEvent = procedure(AContext: TIdContext) of object;
TIdServerContext = class(TIdContext)
protected
FServer: TIdCustomTCPServer;
public
property Server: TIdCustomTCPServer read FServer;
end;
TIdServerContextClass = class of TIdServerContext;
TIdCustomTCPServer = class(TIdComponent)
protected
FActive: Boolean;
{$IFDEF USE_OBJECT_ARC}[Weak]{$ENDIF} FScheduler: TIdScheduler;
FBindings: TIdSocketHandles;
FContextClass: TIdServerContextClass;
FImplicitScheduler: Boolean;
FImplicitIOHandler: Boolean;
{$IFDEF USE_OBJECT_ARC}[Weak]{$ENDIF} FIntercept: TIdServerIntercept;
{$IFDEF USE_OBJECT_ARC}[Weak]{$ENDIF} FIOHandler: TIdServerIOHandler;
FListenerThreads: TIdListenerThreadList;
FListenQueue: integer;
FMaxConnections: Integer;
FReuseSocket: TIdReuseSocket;
FTerminateWaitTime: Integer;
FContexts: TIdContextThreadList;
FOnContextCreated: TIdServerThreadEvent;
FOnConnect: TIdServerThreadEvent;
FOnDisconnect: TIdServerThreadEvent;
FOnException: TIdServerThreadExceptionEvent;
FOnExecute: TIdServerThreadEvent;
FOnListenException: TIdListenExceptionEvent;
FOnBeforeBind: TIdSocketHandleEvent;
FOnAfterBind: TNotifyEvent;
FOnBeforeListenerRun: TIdNotifyThreadEvent;
FUseNagle : Boolean;
//
procedure CheckActive;
procedure CheckOkToBeActive; virtual;
procedure ContextCreated(AContext: TIdContext); virtual;
procedure ContextConnected(AContext: TIdContext); virtual;
procedure ContextDisconnected(AContext: TIdContext); virtual;
function CreateConnection: TIdTCPConnection; virtual;
procedure DoBeforeBind(AHandle: TIdSocketHandle); virtual;
procedure DoAfterBind; virtual;
procedure DoBeforeListenerRun(AThread: TIdThread); virtual;
procedure DoConnect(AContext: TIdContext); virtual;
procedure DoDisconnect(AContext: TIdContext); virtual;
procedure DoException(AContext: TIdContext; AException: Exception); virtual;
function DoExecute(AContext: TIdContext): Boolean; virtual;
procedure DoListenException(AThread: TIdListenerThread; AException: Exception); virtual;
procedure DoMaxConnectionsExceeded(AIOHandler: TIdIOHandler); virtual;
procedure DoTerminateContext(AContext: TIdContext); virtual;
function GetDefaultPort: TIdPort;
procedure InitComponent; override;
procedure Loaded; override;
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
// This is needed for POP3's APOP authentication. For that,
// you send a unique challenge to the client dynamically.
procedure SendGreeting(AContext: TIdContext; AGreeting: TIdReply); virtual;
procedure SetActive(AValue: Boolean); virtual;
procedure SetBindings(const AValue: TIdSocketHandles); virtual;
procedure SetDefaultPort(const AValue: TIdPort); virtual;
procedure SetIntercept(const AValue: TIdServerIntercept); virtual;
procedure SetIOHandler(const AValue: TIdServerIOHandler); virtual;
procedure SetScheduler(const AValue: TIdScheduler); virtual;
procedure Startup; virtual;
procedure Shutdown; virtual;
procedure TerminateAllThreads;
// Occurs in the context of the peer thread
property OnExecute: TIdServerThreadEvent read FOnExecute write FOnExecute;
public
destructor Destroy; override;
//
procedure StartListening;
procedure StopListening;
//
property Contexts: TIdContextThreadList read FContexts;
property ContextClass: TIdServerContextClass read FContextClass write FContextClass;
property ImplicitIOHandler: Boolean read FImplicitIOHandler;
property ImplicitScheduler: Boolean read FImplicitScheduler;
published
property Active: Boolean read FActive write SetActive default False;
property Bindings: TIdSocketHandles read FBindings write SetBindings;
property DefaultPort: TIdPort read GetDefaultPort write SetDefaultPort;
property Intercept: TIdServerIntercept read FIntercept write SetIntercept;
property IOHandler: TIdServerIOHandler read FIOHandler write SetIOHandler;
property ListenQueue: integer read FListenQueue write FListenQueue default IdListenQueueDefault;
property MaxConnections: Integer read FMaxConnections write FMaxConnections default 0;
// right before/after binding sockets
property OnBeforeBind: TIdSocketHandleEvent read FOnBeforeBind write FOnBeforeBind;
property OnAfterBind: TNotifyEvent read FOnAfterBind write FOnAfterBind;
property OnBeforeListenerRun: TIdNotifyThreadEvent read FOnBeforeListenerRun write FOnBeforeListenerRun;
property OnContextCreated: TIdServerThreadEvent read FOnContextCreated write FOnContextCreated;
// Occurs in the context of the peer thread
property OnConnect: TIdServerThreadEvent read FOnConnect write FOnConnect;
// Occurs in the context of the peer thread
property OnDisconnect: TIdServerThreadEvent read FOnDisconnect write FOnDisconnect;
// Occurs in the context of the peer thread
property OnException: TIdServerThreadExceptionEvent read FOnException write FOnException;
property OnListenException: TIdListenExceptionEvent read FOnListenException write FOnListenException;
property ReuseSocket: TIdReuseSocket read FReuseSocket write FReuseSocket default rsOSDependent; // {$IFDEF HAS_DEPRECATED}deprecated{$IFDEF HAS_DEPRECATED_MSG} 'Use TIdSocketHandle.ReuseSocket'{$ENDIF};{$ENDIF}
//UseNagle should be set to true in most cases.
//See: http://tangentsoft.net/wskfaq/intermediate.html#disable-nagle and
// http://tangentsoft.net/wskfaq/articles/lame-list.html#item19
//The Nagle algorithm reduces the amount of needless traffic. Disabling Nagle
//program<61>s throughput to degrade.
property UseNagle: boolean read FUseNagle write FUseNagle default true;
property TerminateWaitTime: Integer read FTerminateWaitTime write FTerminateWaitTime default 5000;
property Scheduler: TIdScheduler read FScheduler write SetScheduler;
end;
EIdTCPServerError = class(EIdException);
EIdNoExecuteSpecified = class(EIdTCPServerError);
EIdTerminateThreadTimeout = class(EIdTCPServerError);
implementation
uses
{$IFDEF VCL_2010_OR_ABOVE}
{$IFDEF WINDOWS}
Windows,
{$ENDIF}
{$ENDIF}
IdGlobalCore,
IdResourceStringsCore, IdReplyRFC,
IdSchedulerOfThreadDefault, IdStack,
IdThreadSafe;
{ TIdCustomTCPServer }
procedure TIdCustomTCPServer.CheckActive;
begin
if Active and (not IsDesignTime) and (not IsLoading) then begin
raise EIdTCPServerError.Create(RSCannotPerformTaskWhileServerIsActive);
end;
end;
procedure TIdCustomTCPServer.ContextCreated(AContext: TIdContext);
begin
if Assigned(FOnContextCreated) then begin
FOnContextCreated(AContext);
end;
end;
destructor TIdCustomTCPServer.Destroy;
begin
Active := False;
SetIOHandler(nil);
// Destroy bindings first
FreeAndNil(FBindings);
//
FreeAndNil(FContexts);
FreeAndNil(FListenerThreads);
//
inherited Destroy;
end;
procedure TIdCustomTCPServer.DoBeforeBind(AHandle: TIdSocketHandle);
begin
if Assigned(FOnBeforeBind) then begin
FOnBeforeBind(AHandle);
end;
end;
procedure TIdCustomTCPServer.DoAfterBind;
begin
if Assigned(FOnAfterBind) then begin
FOnAfterBind(Self);
end;
end;
procedure TIdCustomTCPServer.SendGreeting(AContext: TIdContext; AGreeting: TIdReply);
begin
AContext.Connection.IOHandler.Write(AGreeting.FormattedReply);
end;
procedure TIdCustomTCPServer.ContextConnected(AContext: TIdContext);
var
// under ARC, convert weak references to strong references before working with them
LServerIntercept: TIdServerIntercept;
LConnIntercept: TIdConnectionIntercept;
begin
LServerIntercept := Intercept;
if Assigned(LServerIntercept) then begin
LConnIntercept := LServerIntercept.Accept(AContext.Connection);
AContext.Connection.IOHandler.Intercept := LConnIntercept;
if Assigned(LConnIntercept) then begin
LConnIntercept.Connect(AContext.Connection);
end;
end;
DoConnect(AContext);
end;
procedure TIdCustomTCPServer.ContextDisconnected(AContext: TIdContext);
var
// under ARC, convert weak references to strong references before working with them
LIOHandler: TIdIOHandler;
LIntercept: TIdConnectionIntercept;
begin
DoDisconnect(AContext);
LIOHandler := AContext.Connection.IOHandler;
if Assigned(LIOHandler) then begin
LIntercept := LIOHandler.Intercept;
if Assigned(LIntercept) then begin
LIntercept.Disconnect;
FreeAndNil(LIntercept);
LIOHandler.Intercept := nil;
end;
end;
end;
function TIdCustomTCPServer.CreateConnection: TIdTCPConnection;
begin
Result := TIdTCPConnection.Create(nil);
end;
procedure TIdCustomTCPServer.DoConnect(AContext: TIdContext);
begin
if Assigned(OnConnect) then begin
OnConnect(AContext);
end;
end;
procedure TIdCustomTCPServer.DoDisconnect(AContext: TIdContext);
begin
if Assigned(OnDisconnect) then begin
OnDisconnect(AContext);
end;
end;
procedure TIdCustomTCPServer.DoException(AContext: TIdContext; AException: Exception);
begin
if Assigned(OnException) then begin
OnException(AContext, AException);
end;
end;
function TIdCustomTCPServer.DoExecute(AContext: TIdContext): Boolean;
begin
if Assigned(OnExecute) then begin
OnExecute(AContext);
end;
Result := False;
if AContext <> nil then begin
if AContext.Connection <> nil then begin
Result := AContext.Connection.Connected;
end;
end;
end;
procedure TIdCustomTCPServer.DoListenException(AThread: TIdListenerThread; AException: Exception);
begin
if Assigned(FOnListenException) then begin
FOnListenException(AThread, AException);
end;
end;
function TIdCustomTCPServer.GetDefaultPort: TIdPort;
begin
Result := FBindings.DefaultPort;
end;
procedure TIdCustomTCPServer.Loaded;
begin
inherited Loaded;
// Active = True must not be performed before all other props are loaded
if Active then begin
FActive := False;
Active := True;
end;
end;
// under ARC, all weak references to a freed object get nil'ed automatically
// so this is mostly redundant
procedure TIdCustomTCPServer.Notification(AComponent: TComponent; Operation: TOperation);
begin
// Remove the reference to the linked components if they are deleted
if (Operation = opRemove) then begin
if (AComponent = FScheduler) then begin
FScheduler := nil;
FImplicitScheduler := False;
end
else if (AComponent = FIntercept) then begin
FIntercept := nil;
end
else if (AComponent = FIOHandler) then begin
FIOHandler := nil;
FImplicitIOHandler := False;
end;
end;
inherited Notification(AComponent, Operation);
end;
procedure TIdCustomTCPServer.SetActive(AValue: Boolean);
begin
// At design time we just set the value and save it for run time.
// During loading we ignore it till all other properties are set.
// Loaded will recall it to toggle it
if IsDesignTime or IsLoading then begin
FActive := AValue;
end
else if FActive <> AValue then begin
if AValue then begin
CheckOkToBeActive;
try
Startup;
except
FActive := True;
SetActive(False); // allow descendants to clean up
raise;
end;
FActive := True;
end else begin
// Must set to False here. Shutdown() implementations call property setters that check this
FActive := False;
Shutdown;
end;
end;
end;
procedure TIdCustomTCPServer.SetBindings(const AValue: TIdSocketHandles);
begin
FBindings.Assign(AValue);
end;
procedure TIdCustomTCPServer.SetDefaultPort(const AValue: TIdPort);
begin
FBindings.DefaultPort := AValue;
end;
procedure TIdCustomTCPServer.SetIntercept(const AValue: TIdServerIntercept);
begin
{$IFDEF USE_OBJECT_ARC}
// under ARC, all weak references to a freed object get nil'ed automatically
FIntercept := AValue;
{$ELSE}
if FIntercept <> AValue then
begin
// Remove self from the intercept's notification list
if Assigned(FIntercept) then begin
FIntercept.RemoveFreeNotification(Self);
end;
FIntercept := AValue;
// Add self to the intercept's notification list
if Assigned(FIntercept) then begin
FIntercept.FreeNotification(Self);
end;
end;
{$ENDIF}
end;
procedure TIdCustomTCPServer.SetScheduler(const AValue: TIdScheduler);
var
// under ARC, convert weak references to strong references before working with them
LScheduler: TIdScheduler;
LIOHandler: TIdServerIOHandler;
begin
LScheduler := FScheduler;
if LScheduler <> AValue then
begin
// RLebeau - is this really needed? What should happen if this
// gets called by Notification() if the Scheduler is freed while
// the server is still Active?
if Active then begin
raise EIdException.Create(RSTCPServerSchedulerAlreadyActive);
end;
// under ARC, all weak references to a freed object get nil'ed automatically
// If implicit one already exists free it
// Free the default Thread manager
if FImplicitScheduler then begin
// Under D8 notification gets called after .Free of FreeAndNil, but before
// its set to nil with a side effect of IDisposable. To counteract this we
// set it to nil first.
// -Kudzu
FScheduler := nil;
FImplicitScheduler := False;
IdDisposeAndNil(LScheduler);
end;
{$IFNDEF USE_OBJECT_ARC}
// Ensure we will no longer be notified when the component is freed
if LScheduler <> nil then begin
LScheduler.RemoveFreeNotification(Self);
end;
{$ENDIF}
FScheduler := AValue;
{$IFNDEF USE_OBJECT_ARC}
// Ensure we will be notified when the component is freed, even is it's on
// another form
if AValue <> nil then begin
AValue.FreeNotification(Self);
end;
{$ENDIF}
LIOHandler := FIOHandler;
if LIOHandler <> nil then begin
LIOHandler.SetScheduler(AValue);
end;
end;
end;
procedure TIdCustomTCPServer.SetIOHandler(const AValue: TIdServerIOHandler);
var
// under ARC, convert a weak reference to a strong reference before working with it
LIOHandler: TIdServerIOHandler;
begin
LIOHandler := FIOHandler;
if LIOHandler <> AValue then begin
// RLebeau - is this needed? SetScheduler() does it, so should SetIOHandler()
// also do it? What should happen if this gets called by Notification() if the
// IOHandler is freed while the server is still Active?
{
if Active then begin
raise EIdException.Create(RSTCPServerIOHandlerAlreadyActive);
end;
}
if FImplicitIOHandler then begin
FIOHandler := nil;
FImplicitIOHandler := False;
IdDisposeAndNil(LIOHandler);
end;
{$IFNDEF USE_OBJECT_ARC}
// Ensure we will no longer be notified when the component is freed
if Assigned(LIOHandler) then begin
LIOHandler.RemoveFreeNotification(Self);
end;
{$ENDIF}
FIOHandler := AValue;
if AValue <> nil then begin
{$IFNDEF USE_OBJECT_ARC}
// Ensure we will be notified when the component is freed, even is it's on
// another form
AValue.FreeNotification(Self);
{$ENDIF}
AValue.SetScheduler(FScheduler);
end;
end;
end;
procedure TIdCustomTCPServer.StartListening;
var
LListenerThreads: TIdListenerList;
LListenerThread: TIdListenerThread;
I: Integer;
LBinding: TIdSocketHandle;
begin
LListenerThreads := FListenerThreads.LockList;
try
// Set up any sockets that are not already listening
I := LListenerThreads.Count;
try
while I < Bindings.Count do begin
LBinding := Bindings[I];
LBinding.AllocateSocket;
// do not overwrite if the default. This allows ReuseSocket to be set per binding
if FReuseSocket <> rsOSDependent then begin
LBinding.ReuseSocket := FReuseSocket;
end;
DoBeforeBind(LBinding);
LBinding.Bind;
LBinding.UseNagle := FUseNagle;
Inc(I);
end;
except
Dec(I); // the one that failed doesn't need to be closed
while I >= 0 do begin
Bindings[I].CloseSocket;
Dec(I);
end;
raise;
end;
if I > LListenerThreads.Count then begin
DoAfterBind;
end;
// Set up any threads that are not already running
for I := LListenerThreads.Count to Bindings.Count - 1 do
begin
LBinding := Bindings[I];
LBinding.Listen(FListenQueue);
LListenerThread := TIdListenerThread.Create(Self, LBinding);
try
LListenerThread.Name := Name + ' Listener #' + IntToStr(I + 1); {do not localize}
LListenerThread.OnBeforeRun := DoBeforeListenerRun;
//Todo: Implement proper priority handling for Linux
//http://www.midnightbeach.com/jon/pubs/2002/BorCon.London/Sidebar.3.html
LListenerThread.Priority := tpListener;
LListenerThreads.Add(LListenerThread);
except
LBinding.CloseSocket;
FreeAndNil(LListenerThread);
raise;
end;
LListenerThread.Start;
end;
finally
FListenerThreads.UnlockList;
end;
end;
//APR-011207: for safe-close Ex: SQL Server ShutDown 1) stop listen 2) wait until all clients go out
procedure TIdCustomTCPServer.StopListening;
var
LListenerThreads: TIdListenerList;
LListener: TIdListenerThread;
begin
LListenerThreads := FListenerThreads.LockList;
try
while LListenerThreads.Count > 0 do begin
LListener := {$IFDEF HAS_GENERICS_TThreadList}LListenerThreads[0]{$ELSE}TIdListenerThread(LListenerThreads[0]){$ENDIF};
// Stop listening
LListener.Terminate;
LListener.Binding.CloseSocket;
// Tear down Listener thread
LListener.WaitFor;
LListener.Free;
LListenerThreads.Delete(0); // RLebeau 2/17/2006
end;
finally
FListenerThreads.UnlockList;
end;
end;
{$IFDEF STRING_IS_UNICODE}
//This is an ugly hack that's required because a ShortString does not seem
//to be acceptable to D2009's Assert function.
procedure AssertClassName(const ABool : Boolean; const AString : String); inline;
begin
Assert(ABool, AString);
end;
{$ENDIF}
procedure TIdCustomTCPServer.TerminateAllThreads;
var
i: Integer;
LContext: TIdContext;
LList: TIdContextList;
// under ARC, convert a weak reference to a strong reference before working with it
LScheduler: TIdScheduler;
begin
// TODO: reimplement support for TerminateWaitTimeout
//BGO: find out why TerminateAllThreads is sometimes called multiple times
//Kudzu: Its because of notifications. It calls shutdown when the Scheduler is
// set to nil and then again on destroy.
if Contexts <> nil then begin
LList := Contexts.LockList;
try
for i := 0 to LList.Count - 1 do begin
LContext := {$IFDEF HAS_GENERICS_TList}LList.Items[i]{$ELSE}TIdContext(LList.Items[i]){$ENDIF};
Assert(LContext<>nil);
{$IFDEF STRING_IS_UNICODE}
AssertClassName(LContext.Connection<>nil, LContext.ClassName);
{$ELSE}
Assert(LContext.Connection<>nil, LContext.ClassName);
{$ENDIF}
// RLebeau: allow descendants to perform their own cleanups before
// closing the connection. FTP, for example, needs to abort an
// active data transfer on a separate asociated connection
DoTerminateContext(LContext);
end;
finally
Contexts.UnLockList;
end;
end;
// Scheduler may be nil during destroy which calls TerminateAllThreads
// This happens with explicit schedulers
LScheduler := FScheduler;
if Assigned(LScheduler) then begin
LScheduler.TerminateAllYarns;
end;
end;
procedure TIdCustomTCPServer.DoBeforeListenerRun(AThread: TIdThread);
begin
if Assigned(OnBeforeListenerRun) then begin
OnBeforeListenerRun(AThread);
end;
end;
procedure TIdCustomTCPServer.DoMaxConnectionsExceeded(AIOHandler: TIdIOHandler);
begin
//
end;
procedure TIdCustomTCPServer.DoTerminateContext(AContext: TIdContext);
begin
// Dont call disconnect with true. Otherwise it frees the IOHandler and the thread
// is still running which often causes AVs and other.
AContext.Connection.Disconnect(False);
end;
procedure TIdCustomTCPServer.InitComponent;
begin
inherited InitComponent;
FBindings := TIdSocketHandles.Create(Self);
FContexts := TIdContextThreadList.Create;
FContextClass := TIdServerContext;
//
FTerminateWaitTime := 5000;
FListenQueue := IdListenQueueDefault;
FListenerThreads := TIdListenerThreadList.Create;
//TODO: When reestablished, use a sleeping thread instead
// fSessionTimer := TTimer.Create(self);
FUseNagle := true; // default
end;
procedure TIdCustomTCPServer.Shutdown;
var
// under ARC, convert the weak reference to a strong reference before working with it
LIOHandler: TIdServerIOHandler;
begin
// tear down listening threads
StopListening;
// Tear down ThreadMgr
try
TerminateAllThreads;
finally
{//bgo TODO: fix this: and Threads.IsCountLessThan(1)}
// DONE -oAPR: BUG! Threads still live, Mgr dead ;-(
if ImplicitScheduler then begin
SetScheduler(nil);
end;
end;
LIOHandler := IOHandler;
if LIOHandler <> nil then begin
LIOHandler.Shutdown;
end;
end;
// Linux/Unix does not allow an IPv4 socket and an IPv6 socket
// to listen on the same port at the same time! Windows does not
// have that problem...
{$IFNDEF IdIPv6}
{$DEFINE CanCreateTwoBindings}
{$IFDEF LINUX} // should this be UNIX instead?
{$UNDEF CanCreateTwoBindings}
{$ENDIF}
{$IFDEF ANDROID}
{$UNDEF CanCreateTwoBindings}
{$ENDIF}
{$ENDIF}
procedure TIdCustomTCPServer.Startup;
var
LScheduler: TIdScheduler;
LIOHandler: TIdServerIOHandler;
begin
// Set up bindings
if Bindings.Count = 0 then begin
// TODO: on systems that support dual-stack sockets, create a single
// Binding object that supports both IPv4 and IPv6 on the same socket...
Bindings.Add; // IPv4 or IPv6 by default
{$IFNDEF IdIPv6}
{$IFDEF CanCreateTwoBindings}
if GStack.SupportsIPv6 then begin
// maybe add a property too, so the developer can switch it on/off
Bindings.Add.IPVersion := Id_IPv6;
end;
{$ENDIF}
{$ENDIF}
end;
// Setup IOHandler
LIOHandler := FIOHandler;
if not Assigned(LIOHandler) then begin
LIOHandler := TIdServerIOHandlerStack.Create(Self);
SetIOHandler(LIOHandler);
FImplicitIOHandler := True;
end;
LIOHandler.Init;
// Set up scheduler
LScheduler := FScheduler;
if not Assigned(FScheduler) then begin
LScheduler := TIdSchedulerOfThreadDefault.Create(Self);
SetScheduler(LScheduler);
FImplicitScheduler := True;
// Useful in debugging and for thread names
LScheduler.Name := Name + 'Scheduler'; {do not localize}
end;
LScheduler.Init;
StartListening;
end;
procedure TIdCustomTCPServer.CheckOkToBeActive;
begin
//nothing here. Override in a descendant for an end-point
end;
{ TIdListenerThread }
procedure TIdListenerThread.AfterRun;
begin
inherited AfterRun;
// Close just own binding. The rest will be closed from their coresponding
// threads
FBinding.CloseSocket;
end;
procedure TIdListenerThread.BeforeRun;
begin
inherited BeforeRun;
if Assigned(FOnBeforeRun) then begin
FOnBeforeRun(Self);
end;
end;
constructor TIdListenerThread.Create(AServer: TIdCustomTCPServer; ABinding: TIdSocketHandle);
begin
inherited Create;
FBinding := ABinding;
FServer := AServer;
end;
type
TIdServerContextAccess = class(TIdServerContext)
end;
procedure TIdListenerThread.Run;
var
LContext: TIdServerContext;
LIOHandler: TIdIOHandler;
LPeer: TIdTCPConnection;
LYarn: TIdYarn;
begin
Assert(Server<>nil);
Assert(Server.IOHandler<>nil);
LContext := nil;
LPeer := nil;
LYarn := nil;
try
// GetYarn can raise exceptions
LYarn := Server.Scheduler.AcquireYarn;
// TODO: under Windows at least, use SO_CONDITIONAL_ACCEPT to allow
// the user to reject connections before they are accepted. Somehow
// expose an event here for the user to decide with...
LIOHandler := Server.IOHandler.Accept(Binding, Self, LYarn);
if LIOHandler = nil then begin
// Listening has finished
Stop;
Abort;
end else begin
// We have accepted the connection and need to handle it
LPeer := TIdTCPConnection.Create(nil);
{$IFDEF USE_OBJECT_ARC}
// under ARC, the TIdTCPConnection.IOHandler property is a weak reference.
// TIdServerIOHandler.Accept() returns an IOHandler with no Owner assigned,
// so lets make the TIdTCPConnection become the Owner in order to keep the
// IOHandler alive whic this method exits.
//
// TODO: should we assign Ownership unconditionally on all platforms?
//
LPeer.InsertComponent(LIOHandler);
{$ENDIF}
LPeer.IOHandler := LIOHandler;
LPeer.ManagedIOHandler := True;
end;
// LastRcvTimeStamp := Now; // Added for session timeout support
// ProcessingTimeout := False;
// Check MaxConnections
if (Server.MaxConnections > 0) and (not Server.Contexts.IsCountLessThan(Server.MaxConnections)) then begin
FServer.DoMaxConnectionsExceeded(LIOHandler);
LPeer.Disconnect;
Abort;
end;
// Create and init context
LContext := Server.FContextClass.Create(LPeer, LYarn, Server.Contexts);
LContext.FServer := Server;
// We set these instead of having the context call them directly
// because they are protected methods. Also its good to keep
// Context indepent of the server as well.
LContext.OnBeforeRun := Server.ContextConnected;
LContext.OnRun := Server.DoExecute;
LContext.OnAfterRun := Server.ContextDisconnected;
LContext.OnException := Server.DoException;
//
Server.ContextCreated(LContext);
//
// If all ok, lets start the yarn
Server.Scheduler.StartYarn(LYarn, LContext);
except
on E: Exception do begin
// RLebeau 1/11/07: TIdContext owns the Peer by default so
// take away ownership here so the Peer is not freed twice
if LContext <> nil then begin
TIdServerContextAccess(LContext).FOwnsConnection := False;
end;
FreeAndNil(LContext);
FreeAndNil(LPeer);
// Must terminate - likely has not started yet
if LYarn <> nil then begin
Server.Scheduler.TerminateYarn(LYarn);
end;
// EAbort is used to kick out above and destroy yarns and other, but
// we dont want to show the user
if not (E is EAbort) then begin
Server.DoListenException(Self, E);
end;
end;
end;
end;
end.
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