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unit filemonitor;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpg_main, fpg_base, contnrs;
type
TFileMonitorEventType = (fmeFileCreated,
fmeFileChanged,
fmeFileDeleted,
fmeFileRenamed,
fmeUnknownChange);
TFileMonitorEventData = record
EventType: TFileMonitorEventType;
FileName: TfpgString;
// OldFileName: TfpgString;
// UserData: Pointer;
end;
TFileChangedEvent = procedure(Sender: TObject; AData: TFileMonitorEventData) of object;
TMonitoredFile = class(TObject)
private
FName: TfpgString;
FSize: Int64;
FDate: TDateTime;
FSHA1: TfpgString;
function AsString: TfpgString;
public
function GetNewSHA1: TfpgString;
procedure UpdateInfo;
property Name: TfpgString read FName write FName;
property Size: Int64 read FSize write FSize;
property Date: TDateTime read FDate write FDate;
property SHA1: TfpgString read FSHA1 write FSHA1;
end;
TFileMonitor = class(TThread)
private
FInterval: LongWord;
FFileList: TThreadList;
FOnFileChanged: TFileChangedEvent;
FCurrent: TMonitoredFile;
FCurrentState: TFileMonitorEventType;
procedure DoFileChangeNotification;
public
constructor CreateCustom;
destructor Destroy; override;
procedure Execute; override;
property Interval: LongWord read FInterval write FInterval;
procedure AddFile(const AFilename: TfpgString);
procedure RemoveFile(const AFilename: TfpgString);
property OnFileChanged: TFileChangedEvent read FOnFileChanged write FOnFileChanged;
end;
implementation
uses
fpg_utils,
sha1;
function ReadFileDate(const AFileName: string): TDateTime;
var
fa: LongInt;
begin
fa := FileAge(AFileName);
Result := FileDateToDateTime(fa);
end;
function ReadFileSize(const AFileName: string): DWord;
var
LFileStream: TFileStream;
begin
LFileStream := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyWrite);
try
Result := LFileStream.Size;
finally
LFileStream.Free;
end;
end;
procedure ReadFileDateSize(const AFileName: string; var ADateTime: TDateTime; var AFileSize: Int64);
begin
ADateTime := ReadFileDate(AFileName);
AFileSize := ReadFileSize(AFileName);
end;
{ TMonitoredFile }
function TMonitoredFile.AsString: TfpgString;
const
OBJ_AS_STRING = '%s %s %d';
begin
Result := Format(OBJ_AS_STRING, [FName, FormatDateTime('yyyy-mm-dd hh:mm:ss', FDate), FSize]);
end;
function TMonitoredFile.GetNewSHA1: TfpgString;
var
lFile: TMonitoredFile;
s: Int64;
d: TDateTime;
begin
s := 0;
d := 0.0;
lFile := TMonitoredFile.Create;
try
lFile.Name := FName;
ReadFileDateSize(lFile.Name, d, s);
lFile.Size := s;
lFile.Date := d;
Result := SHA1ofStr(lFile.AsString);
finally
lFile.Free;
end;
end;
procedure TMonitoredFile.UpdateInfo;
var
s: Int64;
d: TDateTime;
begin
ReadFileDateSize(Name, d, s);
Size := s;
Date := d;
SHA1 := SHA1ofStr(AsString);
end;
{ TFileMonitor }
procedure TFileMonitor.DoFileChangeNotification;
var
rec: TFileMonitorEventData;
begin
if Assigned(FOnFileChanged) then
begin
rec.EventType := FCurrentState;
rec.FileName := FCurrent.Name;
FOnFileChanged(self, rec);
end;
end;
constructor TFileMonitor.CreateCustom;
begin
Create(True);
FFileList := TThreadList.Create;
FInterval := 500;
end;
destructor TFileMonitor.Destroy;
var
f: TMonitoredFile;
lst: TList;
i: integer;
begin
try
lst := FFileList.LockList;
for i := lst.Count-1 downto 0 do
begin
f := TMonitoredFile(lst[i]);
lst.Remove(f);
f.Free;
end;
finally
FFileList.UnlockList;
end;
FFileList.Free;
inherited Destroy;
end;
procedure TFileMonitor.Execute;
var
i: integer;
lFile: TMonitoredFile;
lst: TList;
begin
while not Terminated do
begin
if Assigned(FOnFileChanged) then
begin
lst := FFileList.LockList;
try
for i := lst.Count-1 downto 0 do
begin
lFile := TMonitoredFile(lst[i]);
if fpgFileExists(lFile.Name) then
begin
if lFile.SHA1 <> lFile.GetNewSHA1 then
begin
FCurrent := lFile;
FCurrentState := fmeFileChanged;
Synchronize(@DoFileChangeNotification);
lFile.UpdateInfo;
end;
end
else
begin
FCurrent := lFile;
FCurrentState := fmeFileDeleted;
Synchronize(@DoFileChangeNotification);
lst.Remove(lFile);
end;
end;
finally
FFileList.UnlockList;
end;
end;
sleep(FInterval);
end;
end;
procedure TFileMonitor.AddFile(const AFilename: TfpgString);
var
lFile: TMonitoredFile;
s: Int64;
d: TDateTime;
begin
s := 0;
d := 0.0;
lFile := TMonitoredFile.Create;
lFile.Name := AFileName;
ReadFileDateSize(AFileName, d, s);
lFile.Size := s;
lFile.Date := d;
lFile.SHA1 := SHA1ofStr(lFile.AsString);
FFileList.Add(lFile);
end;
procedure TFileMonitor.RemoveFile(const AFilename: TfpgString);
var
i: integer;
lFile: TMonitoredFile;
lst: TList;
begin
lst := FFileList.LockList;
try
for i := 0 to lst.Count-1 do
begin
if AFilename = TMonitoredFile(lst[i]).Name then
begin
lFile := TMonitoredFile(lst[i]);
lst.Delete(i);
lFile.Free;
break;
end;
end;
finally
FFileList.UnlockList;
end;
end;
end.
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