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UHTTPStreamReader.pas
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UHTTPStreamReader.pas
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unit UHTTPStreamReader;
interface
uses
Classes {$IFDEF MSWINDOWS} , Windows {$ENDIF}, SysUtils,
IdIntercept, IdInterceptThrottler, IdBaseComponent, IdComponent,
IdTCPConnection, IdTCPClient, IdHTTP;
type
TTestStream = class(TCustomMemoryStream)
private
FPosition: Longint;
//procedure SetCapacity(NewCapacity: Longint); override;
public
function Seek(Offset: Longint; Origin: Word): Longint; override;
function Write(const Buffer; Count: Longint): Longint; override;
end;
THTTPStreamReader = class(TThread)
protected
procedure Execute; override;
private
procedure OnHTTPProgress(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64);
procedure Log;
public
idHTTP: TIdHTTP;
idInterceptThrottler: TIdInterceptThrottler;
m_sNum: Integer;
m_sURL: string;
m_uMaxSpeed: UInt64;
m_uResponseCode: Int64;
m_uResponseContentLength: Int64;
m_uStartPosition: Int64;
m_uEndPosition: Int64;
m_lastError: string;
m_sLastMessage: string;
m_sNullStream: TTestStream;
constructor Create(Num: Integer; URL: string; MaxSpeed: UInt64);
destructor Destroy(); override;
end;
implementation
uses
wMain, IdHTTPHeaderInfo;
{
Important: Methods and properties of objects in visual components can only be
used in a method called using Synchronize, for example,
Synchronize(UpdateCaption);
and UpdateCaption could look like,
procedure HTTPStreamReader.UpdateCaption;
begin
Form1.Caption := 'Updated in a thread';
end;
or
Synchronize(
procedure
begin
Form1.Caption := 'Updated in thread via an anonymous method'
end
)
);
where an anonymous method is passed.
Similarly, the developer can call the Queue method with similar parameters as
above, instead passing another TThread class as the first parameter, putting
the calling thread in a queue with the other thread.
}
{procedure TTestStream.SetCapacity(NewCapacity: Longint);
begin
//
end; }
function TTestStream.Write(const Buffer; Count: Longint): Longint;
begin
Result := Count;
end;
function TTestStream.Seek(Offset: Longint; Origin: Word): Longint;
begin
case Origin of
soFromBeginning: FPosition := Offset;
soFromCurrent: Inc(FPosition, Offset);
//soFromEnd: FPosition := FSize + Offset;
end;
Result := FPosition;
end;
{ HTTPStreamReader }
constructor THTTPStreamReader.Create(Num: Integer; URL: string; MaxSpeed: UInt64);
begin
inherited Create(true);
m_sNum := Num;
m_sURL := URL;
m_uMaxSpeed := MaxSpeed;
m_sNullStream := TTestStream.Create;
Self.FreeOnTerminate := false;
end;
destructor THTTPStreamReader.Destroy();
begin
if (Assigned(idHTTP)) then
FreeAndNil(idHTTP);
if (Assigned(idInterceptThrottler)) then
FreeAndNil(idInterceptThrottler);
if (Assigned(m_sNullStream)) then
FreeAndNil(m_sNullStream);
inherited Destroy;
end;
procedure THTTPStreamReader.Execute;
var
idRange: TIdEntityRange;
begin
NameThreadForDebugging('HTTPStreamReader-' + IntToStr(m_sNum));
idInterceptThrottler := TIdInterceptThrottler.Create(nil);
idInterceptThrottler.BitsPerSec := m_uMaxSpeed;
idHTTP := TIdHTTP.Create(nil);
idHTTP.Intercept := idInterceptThrottler;
idHTTP.OnWork := Self.OnHTTPProgress;
Randomize;
try
idHTTP.Head(m_sURL);
m_uResponseCode := idHTTP.Response.ResponseCode;
m_uResponseContentLength := idHTTP.Response.ContentLength;
m_uStartPosition := Random(m_uResponseContentLength div 4);
m_uEndPosition := m_uStartPosition + ((100 + Random(100)) * 1024 * 1024);
//m_uEndPosition := m_uResponseContentLength - 1;
while (not Terminated) do
begin
idHTTP.Request.Ranges.Clear;
idRange := IdHTTP.Request.Ranges.Add;
idRange.StartPos := m_uStartPosition;
idRange.EndPos := m_uEndPosition;
m_sLastMessage := 'Thread #' + IntToStr(m_sNum) + ' :: Start: ' + IntToStr(m_uStartPosition) + '; End: ' + IntToStr(m_uEndPosition) + '; Code: ' + IntToStr(m_uResponseCode);
Synchronize(Log);
idHTTP.Get(m_sURL, m_sNullStream);
if (m_uEndPosition <= m_uResponseContentLength) then
m_uStartPosition := m_uEndPosition
else
m_uStartPosition := 0;
m_uEndPosition := m_uStartPosition + ((100 + Random(100)) * 1024 * 1024);
end;
except
on E: Exception do begin
m_lastError := E.ClassName + ': ' + E.Message;
Synchronize(
procedure begin
fMain.Log(m_lastError);
end
);
end;
end;
end;
procedure THTTPStreamReader.OnHTTPProgress(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64);
begin
if Self.Terminated then begin
if (idHTTP.Connected) then begin
idHTTP.Disconnect;
idHTTP.IOHandler.InputBuffer.Clear;
if (idHTTP.Connected) then
Abort;
end;
end;
end;
procedure THTTPStreamReader.Log;
begin
fMain.Log(m_sLastMessage);
end;
end.