unit UPluginLoader;
{*********************
UPluginLoader
Unit contains to Classes
TPluginLoader: Class Searching for and Loading the Plugins
TtehPlugins: Class that represents the Plugins in Modules chain
*********************}
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
uses UPluginDefs, UCoreModule;
type
TPluginListItem = record
Info: TUS_PluginInfo;
State: Byte; //State of this Plugin: 0 - undefined; 1 - Loaded; 2 - Inited / Running; 4 - Unloaded; 254 - Loading aborted by Plugin; 255 - Unloaded because of Error
Path: String; //Path to this Plugin
NeedsDeInit: Boolean; //If this is Inited correctly this should be true
hLib: THandle; //Handle of Loaded Libary
Procs: record //Procs offered by Plugin. Don't call this directly use wrappers of TPluginLoader
Load: Func_Load;
Init: Func_Init;
DeInit: Proc_DeInit;
end;
end;
{*********************
TPluginLoader
Class Searches for Plugins and Manages loading and unloading
*********************}
PPluginLoader = ^TPluginLoader;
TPluginLoader = class (TCoreModule)
private
LoadingProcessFinished: Boolean;
sUnloadPlugin: THandle;
sLoadPlugin: THandle;
sGetPluginInfo: THandle;
sGetPluginState: THandle;
Procedure FreePlugin(Index: Cardinal);
public
PluginInterface: TUS_PluginInterface;
Plugins: Array of TPluginListItem;
//TCoreModule methods to inherit
Constructor Create; override;
Procedure Info(const pInfo: PModuleInfo); override;
Function Load: Boolean; override;
Function Init: Boolean; override;
Procedure DeInit; override;
Procedure Free; override;
//New Methods
Procedure BrowseDir(Path: String); //Browses the Path at _Path_ for Plugins
Function PluginExists(Name: String): Integer; //If Plugin Exists: Index of Plugin, else -1
Procedure AddPlugin(Filename: String);//Adds Plugin to the Array
Function CallLoad(Index: Cardinal): Integer;
Function CallInit(Index: Cardinal): Integer;
Procedure CallDeInit(Index: Cardinal);
//Services offered
Function LoadPlugin(wParam: TwParam; lParam: TlParam): integer; //wParam PChar(PluginName/PluginPath) | lParam (if wParam = nil) ID of the Plugin
Function UnloadPlugin(wParam: TwParam; lParam: TlParam): integer; //wParam PChar(PluginName/PluginPath) | lParam (if wParam = nil) ID of the Plugin
Function GetPluginInfo(wParam: TwParam; lParam: TlParam): integer; //If wParam = -1 then (If lParam = nil then get length of Moduleinfo Array. If lparam <> nil then write array of TUS_PluginInfo to address at lparam) Else (Get PluginInfo of Plugin with Index(wParam) to Address at lParam)
Function GetPluginState(wParam: TwParam; lParam: TlParam): integer; //If wParam = -1 then (If lParam = nil then get length of Moduleinfo Array. If lparam <> nil then write array of TUS_PluginInfo to address at lparam) Else (Return PluginInfo of Plugin with Index(wParam))
end;
{*********************
TtehPlugins
Class Represents the Plugins in Module Chain.
It Calls the Plugins Procs and Funcs
*********************}
TtehPlugins = class (TCoreModule)
private
PluginLoader: PPluginLoader;
public
//TCoreModule methods to inherit
Constructor Create; override;
Procedure Info(const pInfo: PModuleInfo); override;
Function Load: Boolean; override;
Function Init: Boolean; override;
Procedure DeInit; override;
end;
const
{$IFDEF MSWINDOWS}
PluginFileExtension = '.dll';
{$ENDIF}
{$IFDEF LINUX}
PluginFileExtension = '.so';
{$ENDIF}
{$IFDEF DARWIN}
PluginFileExtension = '.dylib';
{$ENDIF}
implementation
uses UCore, UPluginInterface,
{$IFDEF MSWINDOWS}
windows,
{$ELSE}
dynlibs,
{$ENDIF}
UMain, SysUtils;
{*********************
TPluginLoader
Implentation
*********************}
//-------------
// Function that gives some Infos about the Module to the Core
//-------------
Procedure TPluginLoader.Info(const pInfo: PModuleInfo);
begin
pInfo^.Name := 'TPluginLoader';
pInfo^.Version := MakeVersion(1,0,0,chr(0));
pInfo^.Description := 'Searches for Plugins, loads and unloads them';
end;
//-------------
// Just the Constructor
//-------------
Constructor TPluginLoader.Create;
begin
//Init PluginInterface
//Using Methods from UPluginInterface
PluginInterface.CreateHookableEvent := CreateHookableEvent;
PluginInterface.DestroyHookableEvent := DestroyHookableEvent;
PluginInterface.NotivyEventHooks := NotivyEventHooks;
PluginInterface.HookEvent := HookEvent;
PluginInterface.UnHookEvent := UnHookEvent;
PluginInterface.EventExists := EventExists;
PluginInterface.CreateService := @CreateService;
PluginInterface.DestroyService := DestroyService;
PluginInterface.CallService := CallService;
PluginInterface.ServiceExists := ServiceExists;
//UnSet Private Var
LoadingProcessFinished := False;
end;
//-------------
//Is Called on Loading.
//In this Method only Events and Services should be created
//to offer them to other Modules or Plugins during the Init process
//If False is Returned this will cause a Forced Exit
//-------------
Function TPluginLoader.Load: Boolean;
begin
Result := True;
Try
//Start Searching for Plugins
BrowseDir(PluginPath);
Except
Result := False;
Core.ReportError(Integer(PChar('Error Browsing and Loading.')), PChar('TPluginLoader'));
end;
end;
//-------------
//Is Called on Init Process
//In this Method you can Hook some Events and Create + Init
//your Classes, Variables etc.
//If False is Returned this will cause a Forced Exit
//-------------
Function TPluginLoader.Init: Boolean;
begin
//Just set Prvate Var to true.
LoadingProcessFinished := True;
Result := True;
end;
//-------------
//Is Called if this Module has been Inited and there is a Exit.
//Deinit is in backwards Initing Order
//-------------
Procedure TPluginLoader.DeInit;
var
I: Integer;
begin
//Force DeInit
//If some Plugins aren't DeInited for some Reason o0
For I := 0 to High(Plugins) do
begin
If (Plugins[I].State < 4) then
FreePlugin(I);
end;
//Nothing to do here. Core will remove the Hooks
end;
//-------------
//Is Called if this Module will be unloaded and has been created
//Should be used to Free Memory
//-------------
Procedure TPluginLoader.Free;
begin
//Just save some Memory if it wasn't done now..
SetLength(Plugins, 0);
end;
//--------------
// Browses the Path at _Path_ for Plugins
//--------------
Procedure TPluginLoader.BrowseDir(Path: String);
var
SR: TSearchRec;
begin
//Search for other Dirs to Browse
if FindFirst(Path + '*', faDirectory, SR) = 0 then begin
repeat
if (SR.Name <> '.') and (SR.Name <> '..') then
BrowseDir(Path + Sr.Name + PathDelim);
until FindNext(SR) <> 0;
end;
FindClose(SR);
//Search for Plugins at Path
if FindFirst(Path + '*' + PluginFileExtension, 0, SR) = 0 then
begin
repeat
AddPlugin(Path + SR.Name);
until FindNext(SR) <> 0;
end;
FindClose(SR);
end;
//--------------
// If Plugin Exists: Index of Plugin, else -1
//--------------
Function TPluginLoader.PluginExists(Name: String): Integer;
var
I: Integer;
begin
Result := -1;
If (Length(Name) <= 32 { =>Length(TUS_PluginInfo.Name)}) then
begin
For I := 0 to High(Plugins) do
if (Plugins[I].Info.Name = Name) then
begin //Found the Plugin
Result := I;
Break;
end;
end;
end;
//--------------
// Adds Plugin to the Array
//--------------
Procedure TPluginLoader.AddPlugin(Filename: String);
var
hLib: THandle;
PInfo: Proc_PluginInfo;
Info: TUS_PluginInfo;
PluginID: Integer;
begin
If (FileExists(Filename)) then
begin //Load Libary
hLib := LoadLibrary(PChar(Filename));
If (hLib <> 0) then
begin //Try to get Address of the Info Proc
PInfo := GetProcAddress (hLib, PChar('USPlugin_Info'));
If (@PInfo <> nil) then
begin
Info.cbSize := SizeOf(TUS_PluginInfo);
Try //Call Info Proc
PInfo(@Info);
Except
Info.Name := '';
Core.ReportError(Integer(PChar('Error getting Plugin Info: ' + Filename)), PChar('TPluginLoader'));
end;
//Is Name set ?
If (Trim(Info.Name) <> '') then
begin
PluginID := PluginExists(Info.Name);
If (PluginID > 0) AND (Plugins[PluginID].State >=4) then
PluginID := -1;
If (PluginID = -1) then
begin
//Add new item to array
PluginID := Length(Plugins);
SetLength(Plugins, PluginID + 1);
//Fill with Info:
Plugins[PluginID].Info := Info;
Plugins[PluginID].State := 0;
Plugins[PluginID].Path := Filename;
Plugins[PluginID].NeedsDeInit := False;
Plugins[PluginID].hLib := hLib;
//Try to get Procs
Plugins[PluginID].Procs.Load := GetProcAddress (hLib, PChar('USPlugin_Load'));
Plugins[PluginID].Procs.Init := GetProcAddress (hLib, PChar('USPlugin_Init'));
Plugins[PluginID].Procs.DeInit := GetProcAddress (hLib, PChar('USPlugin_DeInit'));
If (@Plugins[PluginID].Procs.Load = nil) OR (@Plugins[PluginID].Procs.Init = nil) OR (@Plugins[PluginID].Procs.DeInit = nil) then
begin
Plugins[PluginID].State := 255;
FreeLibrary(hLib);
Core.ReportError(Integer(PChar('Can''t get Plugin Procs from Libary: "' + Info.Name + '" ' + Filename)), PChar('TPluginLoader'));
end;
//Emulate loading process if this Plugin is loaded to late
If (LoadingProcessFinished) then
begin
CallLoad(PluginID);
CallInit(PluginID);
end;
end
Else If (LoadingProcessFinished = False) then
begin
If (Plugins[PluginID].Info.Version < Info.Version) then
begin //Found newer Version of this Plugin
Core.ReportDebug(Integer(PChar('Found a newer Version of Plugin: ' + String(Info.Name))), PChar('TPluginLoader'));
//Unload Old Plugin
UnloadPlugin(PluginID, nil);
//Fill with new Info
Plugins[PluginID].Info := Info;
Plugins[PluginID].State := 0;
Plugins[PluginID].Path := Filename;
Plugins[PluginID].NeedsDeInit := False;
Plugins[PluginID].hLib := hLib;
//Try to get Procs
Plugins[PluginID].Procs.Load := GetProcAddress (hLib, PChar('USPlugin_Load'));
Plugins[PluginID].Procs.Init := GetProcAddress (hLib, PChar('USPlugin_Init'));
Plugins[PluginID].Procs.DeInit := GetProcAddress (hLib, PChar('USPlugin_DeInit'));
If (@Plugins[PluginID].Procs.Load = nil) OR (@Plugins[PluginID].Procs.Init = nil) OR (@Plugins[PluginID].Procs.DeInit = nil) then
begin
FreeLibrary(hLib);
Plugins[PluginID].State := 255;
Core.ReportError(Integer(PChar('Can''t get Plugin Procs from Libary: "' + Info.Name + '" ' + Filename)), PChar('TPluginLoader'));
end;
end
else
begin //Newer Version already loaded
FreeLibrary(hLib);
end;
end
else
begin
FreeLibrary(hLib);
Core.ReportError(Integer(PChar('Plugin with this Name already exists: ' + String(Info.Name))), PChar('TPluginLoader'));
end;
end
else
begin
FreeLibrary(hLib);
Core.ReportError(Integer(PChar('No name reported: ' + Filename)), PChar('TPluginLoader'));
end;
end
else
begin
FreeLibrary(hLib);
Core.ReportError(Integer(PChar('Can''t find Info Procedure: ' + Filename)), PChar('TPluginLoader'));
end;
end
else
Core.ReportError(Integer(PChar('Can''t load Plugin Libary: ' + Filename)), PChar('TPluginLoader'));
end;
end;
//--------------
// Calls Load Func of Plugin with the given Index
//--------------
Function TPluginLoader.CallLoad(Index: Cardinal): Integer;
begin
Result := -2;
If(Index < Length(Plugins)) then
begin
If (@Plugins[Index].Procs.Load <> nil) AND (Plugins[Index].State = 0) then
begin
Try
Result := Plugins[Index].Procs.Load(@PluginInterface);
Except
Result := -3;
End;
If (Result = 0) then
Plugins[Index].State := 1
Else
begin
FreePlugin(Index);
Plugins[Index].State := 255;
Core.ReportError(Integer(PChar('Error calling Load Function from Plugin: ' + String(Plugins[Index].Info.Name))), PChar('TPluginLoader'));
end;
end;
end;
end;
//--------------
// Calls Init Func of Plugin with the given Index
//--------------
Function TPluginLoader.CallInit(Index: Cardinal): Integer;
begin
Result := -2;
If(Index < Length(Plugins)) then
begin
If (@Plugins[Index].Procs.Init <> nil) AND (Plugins[Index].State = 1) then
begin
Try
Result := Plugins[Index].Procs.Init(@PluginInterface);
Except
Result := -3;
End;
If (Result = 0) then
begin
Plugins[Index].State := 2;
Plugins[Index].NeedsDeInit := True;
end
Else
begin
FreePlugin(Index);
Plugins[Index].State := 255;
Core.ReportError(Integer(PChar('Error calling Init Function from Plugin: ' + String(Plugins[Index].Info.Name))), PChar('TPluginLoader'));
end;
end;
end;
end;
//--------------
// Calls DeInit Proc of Plugin with the given Index
//--------------
Procedure TPluginLoader.CallDeInit(Index: Cardinal);
begin
If(Index < Length(Plugins)) then
begin
If (Plugins[Index].State < 4) then
begin
If (@Plugins[Index].Procs.DeInit <> nil) and (Plugins[Index].NeedsDeInit) then
Try
Plugins[Index].Procs.DeInit(@PluginInterface);
Except
End;
//Don't forget to remove Services and Subscriptions by this Plugin
Core.Hooks.DelbyOwner(-1 - Index);
FreePlugin(Index);
end;
end;
end;
//--------------
// Frees all Plugin Sources (Procs and Handles) - Helper for Deiniting Functions
//--------------
Procedure TPluginLoader.FreePlugin(Index: Cardinal);
begin
Plugins[Index].State := 4;
Plugins[Index].Procs.Load := nil;
Plugins[Index].Procs.Init := nil;
Plugins[Index].Procs.DeInit := nil;
If (Plugins[Index].hLib <> 0) then
FreeLibrary(Plugins[Index].hLib);
end;
//--------------
// wParam PChar(PluginName/PluginPath) | wParam (if lParam = nil) ID of the Plugin
//--------------
Function TPluginLoader.LoadPlugin(wParam: TwParam; lParam: TlParam): integer;
var
Index: Integer;
sFile: String;
begin
Result := -1;
sFile := '';
//lParam is ID
If (lParam = nil) then
begin
Index := wParam;
end
else
begin //lParam is PChar
try
sFile := String(PChar(lParam));
Index := PluginExists(sFile);
If (Index < 0) And FileExists(sFile) then
begin //Is Filename
AddPlugin(sFile);
Result := Plugins[High(Plugins)].State;
end;
except
Index := -2;
end;
end;
If (Index >= 0) and (Index < Length(Plugins)) then
begin
AddPlugin(Plugins[Index].Path);
Result := Plugins[Index].State;
end;
end;
//--------------
// wParam PChar(PluginName/PluginPath) | wParam (if lParam = nil) ID of the Plugin
//--------------
Function TPluginLoader.UnloadPlugin(wParam: TwParam; lParam: TlParam): integer;
var
Index: Integer;
sName: String;
begin
Result := -1;
//lParam is ID
If (lParam = nil) then
begin
Index := wParam;
end
else
begin //wParam is PChar
try
sName := String(PChar(lParam));
Index := PluginExists(sName);
except
Index := -2;
end;
end;
If (Index >= 0) and (Index < Length(Plugins)) then
CallDeInit(Index)
end;
//--------------
// If wParam = -1 then (If lParam = nil then get length of Moduleinfo Array. If lparam <> nil then write array of TUS_PluginInfo to address at lparam) Else (Get PluginInfo of Plugin with Index(wParam) to Address at lParam)
//--------------
Function TPluginLoader.GetPluginInfo(wParam: TwParam; lParam: TlParam): integer;
var I: Integer;
begin
Result := 0;
If (wParam > 0) then
begin //Get Info of 1 Plugin
If (lParam <> nil) AND (wParam < Length(Plugins)) then
begin
Try
Result := 1;
PUS_PluginInfo(lParam)^ := Plugins[wParam].Info;
Except
End;
end;
end
Else If (lParam = nil) then
begin //Get Length of Plugin (Info) Array
Result := Length(Plugins);
end
Else //Write PluginInfo Array to Address in lParam
begin
Try
For I := 0 to high(Plugins) do
PAUS_PluginInfo(lParam)^[I] := Plugins[I].Info;
Result := Length(Plugins);
Except
Core.ReportError(Integer(PChar('Could not write PluginInfo Array')), PChar('TPluginLoader'));
End;
end;
end;
//--------------
// If wParam = -1 then (If lParam = nil then get length of Plugin State Array. If lparam <> nil then write array of Byte to address at lparam) Else (Return State of Plugin with Index(wParam))
//--------------
Function TPluginLoader.GetPluginState(wParam: TwParam; lParam: TlParam): integer;
var I: Integer;
begin
Result := -1;
If (wParam > 0) then
begin //Get State of 1 Plugin
If (wParam < Length(Plugins)) then
begin
Result := Plugins[wParam].State;
end;
end
Else If (lParam = nil) then
begin //Get Length of Plugin (Info) Array
Result := Length(Plugins);
end
Else //Write PluginInfo Array to Address in lParam
begin
Try
For I := 0 to high(Plugins) do
Byte(Pointer(Integer(lParam) + I)^) := Plugins[I].State;
Result := Length(Plugins);
Except
Core.ReportError(Integer(PChar('Could not write PluginState Array')), PChar('TPluginLoader'));
End;
end;
end;
{*********************
TtehPlugins
Implentation
*********************}
//-------------
// Function that gives some Infos about the Module to the Core
//-------------
Procedure TtehPlugins.Info(const pInfo: PModuleInfo);
begin
pInfo^.Name := 'TtehPlugins';
pInfo^.Version := MakeVersion(1,0,0,chr(0));
pInfo^.Description := 'Module executing the Plugins!';
end;
//-------------
// Just the Constructor
//-------------
Constructor TtehPlugins.Create;
begin
PluginLoader := nil;
end;
//-------------
//Is Called on Loading.
//In this Method only Events and Services should be created
//to offer them to other Modules or Plugins during the Init process
//If False is Returned this will cause a Forced Exit
//-------------
Function TtehPlugins.Load: Boolean;
var
I: Integer; //Counter
CurExecutedBackup: Integer; //backup of Core.CurExecuted Attribute
label Continue;
begin
//Get Pointer to PluginLoader
PluginLoader := PPluginLoader(Core.GetModulebyName('TPluginLoader'));
If (PluginLoader = nil) then
begin
Result := False;
Core.ReportError(Integer(PChar('Could not get Pointer to PluginLoader')), PChar('TtehPlugins'));
end
else
begin
Result := True;
//Backup CurExecuted
CurExecutedBackup := Core.CurExecuted;
//Start Loading the Plugins
I := 0;
Continue:
Try
While (I <= High(PluginLoader.Plugins)) do
begin
Core.CurExecuted := -1 - I;
//Unload Plugin if not correctly Executed
If (PluginLoader.CallLoad(I) <> 0) then
begin
PluginLoader.CallDeInit(I);
PluginLoader.Plugins[I].State := 254; //Plugin asks for unload
Core.ReportDebug(Integer(PChar('Plugin Selfabort during loading process: ' + String(PluginLoader.Plugins[I].Info.Name))), PChar('TtehPlugins'));
end
else
Core.ReportDebug(Integer(PChar('Plugin loaded succesful: ' + String(PluginLoader.Plugins[I].Info.Name))), PChar('TtehPlugins'));
Inc(I);
end;
Except
//Plugin could not be loaded.
// => Show Error Message, then ShutDown Plugin
on E: Exception do
begin
PluginLoader.CallDeInit(I);
PluginLoader.Plugins[I].State := 255; //Plugin causes Error
Core.ReportError(Integer(PChar('Plugin causes Error during loading process: ' + PluginLoader.Plugins[I].Info.Name + ', ErrorMsg: "' + E.Message + '"')), PChar('TtehPlugins'));
//don't forget to increase I
Inc(I);
end;
End;
If (I <= High(PluginLoader.Plugins)) then
Goto Continue;
//Reset CurExecuted
Core.CurExecuted := CurExecutedBackup;
end;
end;
//-------------
//Is Called on Init Process
//In this Method you can Hook some Events and Create + Init
//your Classes, Variables etc.
//If False is Returned this will cause a Forced Exit
//-------------
Function TtehPlugins.Init: Boolean;
var
I: Integer; //Counter
CurExecutedBackup: Integer; //backup of Core.CurExecuted Attribute
label Continue;
begin
Result := True;
//Backup CurExecuted
CurExecutedBackup := Core.CurExecuted;
//Start Loading the Plugins
I := 0;
Continue:
Try
While (I <= High(PluginLoader.Plugins)) do
begin
Core.CurExecuted := -1 - I;
//Unload Plugin if not correctly Executed
If (PluginLoader.CallInit(I) <> 0) then
begin
PluginLoader.CallDeInit(I);
PluginLoader.Plugins[I].State := 254; //Plugin asks for unload
Core.ReportDebug(Integer(PChar('Plugin Selfabort during init process: ' + String(PluginLoader.Plugins[I].Info.Name))), PChar('TtehPlugins'));
end
else
Core.ReportDebug(Integer(PChar('Plugin inited succesful: ' + String(PluginLoader.Plugins[I].Info.Name))), PChar('TtehPlugins'));
//don't forget to increase I
Inc(I);
end;
Except
//Plugin could not be loaded.
// => Show Error Message, then ShutDown Plugin
PluginLoader.CallDeInit(I);
PluginLoader.Plugins[I].State := 255; //Plugin causes Error
Core.ReportError(Integer(PChar('Plugin causes Error during init process: ' + String(PluginLoader.Plugins[I].Info.Name))), PChar('TtehPlugins'));
//don't forget to increase I
Inc(I);
End;
If (I <= High(PluginLoader.Plugins)) then
GoTo Continue;
//Reset CurExecuted
Core.CurExecuted := CurExecutedBackup;
end;
//-------------
//Is Called if this Module has been Inited and there is a Exit.
//Deinit is in backwards Initing Order
//-------------
Procedure TtehPlugins.DeInit;
var
I: Integer; //Counter
CurExecutedBackup: Integer; //backup of Core.CurExecuted Attribute
label Continue;
begin
//Backup CurExecuted
CurExecutedBackup := Core.CurExecuted;
//Start Loop
I := 0;
Continue:
Try
While (I <= High(PluginLoader.Plugins)) do
begin
//DeInit Plugin
PluginLoader.CallDeInit(I);
Inc(I);
end;
Except
Inc(I);
End;
If I <= High(PluginLoader.Plugins) then
Goto Continue;
//Reset CurExecuted
Core.CurExecuted := CurExecutedBackup;
end;
end.