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|
{ FastCGI requester support for lNet
Copyright (C) 2006-2008 Micha Nelissen
This library is Free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is diStributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; withOut even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
for more details.
You should have received a Copy of the GNU Library General Public License
along with This library; if not, Write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
This license has been modified. See file LICENSE.ADDON for more information.
Should you find these sources without a LICENSE File, please contact
me at ales@chello.sk
}
unit lfastcgi;
{$mode objfpc}{$h+}
interface
uses
classes, sysutils, fastcgi_base, lnet, levents, lstrbuffer, ltimer;
type
TLFastCGIClient = class;
TLFastCGIRequest = class;
TLFastCGIPool = class;
TLFastCGIRequestEvent = procedure(ARequest: TLFastCGIRequest) of object;
PLFastCGIRequest = ^TLFastCGIRequest;
TLFastCGIRequest = class(TObject)
protected
FID: integer;
FClient: TLFastCGIClient;
FBuffer: TStringBuffer;
FBufferSendPos: integer;
FHeader: FCGI_Header;
FHeaderPos: integer;
FContentLength: integer;
FInputBuffer: pchar;
FInputSize: integer;
FOutputDone: boolean;
FStderrDone: boolean;
FOutputPending: boolean;
FNextFree: TLFastCGIRequest;
FNextSend: TLFastCGIRequest;
FOnEndRequest: TLFastCGIRequestEvent;
FOnInput: TLFastCGIRequestEvent;
FOnOutput: TLFastCGIRequestEvent;
FOnStderr: TLFastCGIRequestEvent;
procedure HandleReceive;
procedure HandleReceiveEnd;
function HandleSend: boolean;
procedure DoEndRequest;
procedure DoOutput;
procedure DoStderr;
procedure EndRequest;
procedure RewindBuffer;
procedure SetContentLength(NewLength: integer);
procedure SendEmptyRec(AType: integer);
procedure SendGetValues;
procedure SetID(const NewID: integer);
public
constructor Create;
destructor Destroy; override;
procedure AbortRequest;
function Get(ABuffer: pchar; ASize: integer): integer;
procedure ParseClientBuffer;
function SendBuffer: integer;
function SendPrivateBuffer: boolean;
procedure SendBeginRequest(AType: integer);
procedure SendParam(const AName, AValue: string; AReqType: integer = FCGI_PARAMS);
function SendInput(const ABuffer: pchar; ASize: integer): integer;
procedure DoneParams;
procedure DoneInput;
property ID: integer read FID write SetID;
property StderrDone: boolean read FStderrDone;
property OutputDone: boolean read FOutputDone;
property OutputPending: boolean read FOutputPending;
property OnEndRequest: TLFastCGIRequestEvent read FOnEndRequest write FOnEndRequest;
property OnInput: TLFastCGIRequestEvent read FOnInput write FOnInput;
property OnOutput: TLFastCGIRequestEvent read FOnOutput write FOnOutput;
property OnStderr: TLFastCGIRequestEvent read FOnStderr write FOnStderr;
end;
TFastCGIClientState = (fsIdle, fsConnecting, fsConnectingAgain,
fsStartingServer, fsHeader, fsData, fsFlush);
PLFastCGIClient = ^TLFastCGIClient;
TLFastCGIClient = class(TLTcp)
protected
FRequests: PLFastCGIRequest;
FRequestsCount: integer;
FNextRequestID: integer;
FRequestsSent: integer;
FFreeRequest: TLFastCGIRequest;
FSendRequest: TLFastCGIRequest;
FRequest: TLFastCGIRequest;
FState: TFastCGIClientState;
FNextFree: TLFastCGIClient;
FPool: TLFastCGIPool;
FBuffer: pchar;
FBufferEnd: pchar;
FBufferPos: pchar;
FBufferSize: dword;
FReqType: byte;
FContentLength: integer;
FPaddingLength: integer;
function Connect: Boolean; override;
procedure ConnectEvent(ASocket: TLHandle); override;
procedure DisconnectEvent(ASocket: TLHandle); override;
procedure ErrorEvent(ASocket: TLHandle; const msg: string); override;
function CreateRequester: TLFastCGIRequest;
procedure HandleGetValuesResult;
procedure HandleReceive(ASocket: TLSocket);
procedure HandleSend(ASocket: TLSocket);
procedure ParseBuffer;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AddToSendQueue(ARequest: TLFastCGIRequest);
function BeginRequest(AType: integer): TLFastCGIRequest;
procedure EndRequest(ARequest: TLFastCGIRequest);
procedure Flush;
function GetBuffer(ABuffer: pchar; ASize: integer): integer;
property ReqType: byte read FReqType;
property RequestsSent: integer read FRequestsSent;
end;
TSpawnState = (ssNone, ssSpawning, ssSpawned);
TLFastCGIPool = class(TObject)
protected
FClients: PLFastCGIClient;
FClientsCount: integer;
FClientsAvail: integer;
FClientsMax: integer;
FMaxRequestsConn: integer;
FFreeClient: TLFastCGIClient;
FTimer: TLTimer;
FEventer: TLEventer;
FAppName: string;
FAppEnv: string;
FHost: string;
FPort: integer;
FSpawnState: TSpawnState;
procedure AddToFreeClients(AClient: TLFastCGIClient);
function CreateClient: TLFastCGIClient;
procedure ConnectClients(Sender: TObject);
procedure StartServer;
public
constructor Create;
destructor Destroy; override;
function BeginRequest(AType: integer): TLFastCGIRequest;
procedure EndRequest(AClient: TLFastCGIClient);
property AppEnv: string read FAppEnv write FAppEnv;
property AppName: string read FAppName write FAppName;
property ClientsMax: integer read FClientsMax write FClientsMax;
property Eventer: TLEventer read FEventer write FEventer;
property MaxRequestsConn: integer read FMaxRequestsConn write FMaxRequestsConn;
property Host: string read FHost write FHost;
property Port: integer read FPort write FPort;
property Timer: TLTimer read FTimer;
end;
implementation
uses
lSpawnFCGI;
{ TLFastCGIRequest }
constructor TLFastCGIRequest.Create;
begin
inherited;
FBuffer := InitStringBuffer(504);
FHeader.Version := FCGI_VERSION_1;
FHeaderPos := -1;
end;
destructor TLFastCGIRequest.Destroy;
begin
inherited;
FreeMem(FBuffer.Memory);
end;
procedure TLFastCGIRequest.HandleReceive;
begin
case FClient.ReqType of
FCGI_STDOUT: DoOutput;
FCGI_STDERR: DoStderr;
FCGI_END_REQUEST: EndRequest;
FCGI_GET_VALUES_RESULT: FClient.HandleGetValuesResult;
else
FClient.Flush;
end;
end;
procedure TLFastCGIRequest.HandleReceiveEnd;
begin
case FClient.ReqType of
FCGI_STDOUT: FOutputDone := true;
FCGI_STDERR: FStderrDone := true;
end;
end;
function TLFastCGIRequest.HandleSend: boolean;
begin
if FOnInput <> nil then
FOnInput(Self);
Result := FInputBuffer = nil;
end;
procedure TLFastCGIRequest.DoOutput;
begin
if FOnOutput <> nil then
FOnOutput(Self);
end;
procedure TLFastCGIRequest.DoStderr;
begin
if FOnStderr <> nil then
FOnStderr(Self);
end;
procedure TLFastCGIRequest.DoEndRequest;
begin
if FOnEndRequest <> nil then
FOnEndRequest(Self);
end;
procedure TLFastCGIRequest.EndRequest;
begin
FOutputDone := false;
FStderrDone := false;
FClient.EndRequest(Self);
FClient.Flush;
RewindBuffer;
DoEndRequest;
end;
function TLFastCGIRequest.Get(ABuffer: pchar; ASize: integer): integer;
begin
Result := FClient.GetBuffer(ABuffer, ASize);
end;
procedure TLFastCGIRequest.ParseClientBuffer;
begin
FOutputPending := false;
if (FClient.Iterator <> nil) and FClient.Iterator.IgnoreRead then
FClient.HandleReceive(nil)
else
FClient.ParseBuffer;
end;
procedure TLFastCGIRequest.SetID(const NewID: integer);
begin
FID := NewID;
FHeader.RequestIDB0 := byte(NewID and $FF);
FHeader.RequestIDB1 := byte((NewID shr 8) and $FF);
end;
procedure TLFastCGIRequest.SetContentLength(NewLength: integer);
begin
FContentLength := NewLength;
FHeader.ContentLengthB0 := byte(NewLength and $FF);
FHeader.ContentLengthB1 := byte((NewLength shr 8) and $FF);
FHeader.PaddingLength := byte(7-((NewLength+7) and 7));
end;
const
PaddingBuffer: array[0..7] of char = (#0, #0, #0, #0, #0, #0, #0, #0);
type
TLFastCGIStringSize = record
Size: integer;
SizeBuf: array[0..3] of char;
end;
function GetFastCGIStringSize(ABufferPos: pbyte; var ASize: integer): integer;
begin
ASize := ABufferPos[0];
if ASize >= 128 then
begin
ASize := ((ABufferPos[0] shl 24) and $7f) or (ABufferPos[1] shl 16)
or (ABufferPos[2] shl 8) or ABufferPos[3];
Result := 4;
end else
Result := 1;
end;
procedure FillFastCGIStringSize(const AStr: string; var AFastCGIStr: TLFastCGIStringSize);
var
lLen: dword;
begin
lLen := dword(Length(AStr));
if lLen > 127 then
begin
AFastCGIStr.Size := 4;
AFastCGIStr.SizeBuf[0] := char($80 + ((lLen shr 24) and $ff));
AFastCGIStr.SizeBuf[1] := char((lLen shr 16) and $ff);
AFastCGIStr.SizeBuf[2] := char((lLen shr 8) and $ff);
AFastCGIStr.SizeBuf[3] := char(lLen and $ff);
end else begin
AFastCGIStr.Size := 1;
AFastCGIStr.SizeBuf[0] := char(lLen);
end;
end;
procedure TLFastCGIRequest.SendBeginRequest(AType: integer);
var
lBody: FCGI_BeginRequestBody;
begin
lBody.roleB1 := byte((AType shr 8) and $ff);
lBody.roleB0 := byte(AType and $ff);
lBody.flags := FCGI_KEEP_CONN;
FHeader.ReqType := FCGI_BEGIN_REQUEST;
SetContentLength(sizeof(lBody));
AppendString(FBuffer, @FHeader, sizeof(FHeader));
AppendString(FBuffer, @lBody, sizeof(lBody));
end;
procedure TLFastCGIRequest.SendParam(const AName, AValue: string; AReqType: integer = FCGI_PARAMS);
var
lNameLen: TLFastCGIStringSize;
lValueLen: TLFastCGIStringSize;
lTotalLen: integer;
begin
FillFastCGIStringSize(AName, lNameLen);
FillFastCGIStringSize(AValue, lValueLen);
lTotalLen := lNameLen.Size+lValueLen.Size+Length(AName)+Length(AValue);
if (FHeader.ReqType = AReqType) and (FBufferSendPos = 0)
and (0 <= FHeaderPos) and (FHeaderPos < FBuffer.Pos - FBuffer.Memory) then
begin
{ undo padding }
Dec(FBuffer.Pos, FHeader.PaddingLength);
SetContentLength(FContentLength+lTotalLen);
Move(FHeader, FBuffer.Memory[FHeaderPos], sizeof(FHeader));
end else begin
FHeader.ReqType := AReqType;
SetContentLength(lTotalLen);
FHeaderPos := FBuffer.Pos - FBuffer.Memory;
AppendString(FBuffer, @FHeader, sizeof(FHeader));
end;
AppendString(FBuffer, @lNameLen.SizeBuf[0], lNameLen.Size);
AppendString(FBuffer, @lValueLen.SizeBuf[0], lValueLen.Size);
AppendString(FBuffer, AName);
AppendString(FBuffer, AValue);
AppendString(FBuffer, @PaddingBuffer[0], FHeader.PaddingLength);
end;
procedure TLFastCGIRequest.SendGetValues;
var
lRequestID: integer;
begin
{ management record type has request id 0 }
lRequestID := ID;
ID := 0;
SendParam('FCGI_MAX_REQS', '', FCGI_GET_VALUES);
{ if we're the first connection, ask max. # connections }
if FClient.FPool.FClientsAvail = 1 then
SendParam('FCGI_MAX_CONNS', '', FCGI_GET_VALUES);
ID := lRequestID;
end;
function TLFastCGIRequest.SendInput(const ABuffer: pchar; ASize: integer): integer;
begin
{ first send current buffer if any }
if FInputBuffer <> nil then
begin
Result := SendBuffer;
if FInputBuffer <> nil then exit;
end else Result := 0;
if Result >= ASize then exit;
if FInputBuffer = nil then
begin
FInputBuffer := ABuffer+Result;
FInputSize := ASize-Result;
FHeader.ReqType := FCGI_STDIN;
SetContentLength(FInputSize);
AppendString(FBuffer, @FHeader, sizeof(FHeader));
end;
Inc(Result, SendBuffer);
end;
procedure TLFastCGIRequest.RewindBuffer;
begin
FBufferSendPos := 0;
FHeaderPos := -1;
{ rewind stringbuffer }
FBuffer.Pos := FBuffer.Memory;
end;
function TLFastCGIRequest.SendPrivateBuffer: boolean;
var
lWritten: integer;
begin
{ nothing to send ? }
if FBuffer.Pos-FBuffer.Memory = FBufferSendPos then
exit(true);
{ already a queue and we are not first in line ? no use in trying to send then }
if (FClient.FSendRequest = nil) or (FClient.FSendRequest = Self) then
begin
lWritten := FClient.Send(FBuffer.Memory[FBufferSendPos],
FBuffer.Pos-FBuffer.Memory-FBufferSendPos);
Inc(FBufferSendPos, lWritten);
Result := FBufferSendPos = FBuffer.Pos-FBuffer.Memory;
{ do not rewind buffer, unless remote side has had chance to disconnect }
if Result then
RewindBuffer;
end else
Result := false;
if not Result then
FClient.AddToSendQueue(Self);
end;
function TLFastCGIRequest.SendBuffer: integer;
var
lWritten: integer;
begin
{ already a queue and we are not first in line ? no use in trying to send then }
if (FClient.FSendRequest <> nil) and (FClient.FSendRequest <> Self) then
exit(0);
{ header to be sent? }
if not SendPrivateBuffer then exit(0);
{ first write request header, then wait for possible disconnect }
if FBufferSendPos > 0 then exit(0);
if FInputBuffer = nil then exit(0);
lWritten := FClient.Send(FInputBuffer^, FInputSize);
Inc(FInputBuffer, lWritten);
Dec(FInputSize, lWritten);
if FInputSize = 0 then
begin
FInputBuffer := nil;
AppendString(FBuffer, @PaddingBuffer[0], FHeader.PaddingLength);
end else
FClient.AddToSendQueue(Self);
Result := lWritten;
end;
procedure TLFastCGIRequest.SendEmptyRec(AType: integer);
begin
FHeader.ReqType := AType;
SetContentLength(0);
AppendString(FBuffer, @FHeader, sizeof(FHeader));
{ no padding needed for empty string }
end;
procedure TLFastCGIRequest.DoneParams;
begin
SendEmptyRec(FCGI_PARAMS);
end;
procedure TLFastCGIRequest.DoneInput;
begin
SendEmptyRec(FCGI_STDIN);
SendPrivateBuffer;
end;
procedure TLFastCGIRequest.AbortRequest;
begin
FHeader.ReqType := FCGI_ABORT_REQUEST;
SetContentLength(0);
AppendString(FBuffer, @FHeader, sizeof(FHeader));
SendPrivateBuffer;
end;
{ TLFastCGIClient }
const
DataBufferSize = 64*1024-1;
constructor TLFastCGIClient.Create(AOwner: TComponent);
begin
inherited;
FBuffer := GetMem(DataBufferSize+1);
FBufferPos := FBuffer;
FBufferEnd := FBuffer;
FRequests := AllocMem(sizeof(TLFastCGIRequest));
FRequestsCount := 1;
FFreeRequest := nil;
OnReceive := @HandleReceive;
OnCanSend := @HandleSend;
end;
destructor TLFastCGIClient.Destroy;
var
I: integer;
begin
for I := 0 to FNextRequestID-1 do
FRequests[I].Free;
FreeMem(FRequests);
FreeMem(FBuffer);
inherited;
end;
function TLFastCGIClient.GetBuffer(ABuffer: pchar; ASize: integer): integer;
begin
Result := FBufferEnd - FBufferPos;
if Result > FContentLength then
Result := FContentLength;
if Result > ASize then
Result := ASize;
Move(FBufferPos^, ABuffer^, Result);
Inc(FBufferPos, Result);
Dec(FContentLength, Result);
{ buffer empty? reset }
if FBufferPos = FBufferEnd then
begin
FBufferPos := FBuffer;
FBufferEnd := FBuffer;
end;
end;
procedure TLFastCGIClient.ConnectEvent(ASocket: TLHandle);
begin
if FState = fsStartingServer then
FPool.FSpawnState := ssSpawned;
FState := fsHeader;
if FPool <> nil then
FPool.AddToFreeClients(Self);
inherited;
end;
procedure TLFastCGIClient.DisconnectEvent(ASocket: TLHandle);
var
I: integer;
needReconnect: boolean;
begin
inherited;
FRequestsSent := 0;
needReconnect := false;
for I := 0 to FNextRequestID-1 do
if FRequests[I].FNextFree = nil then
begin
{ see if buffer contains request, then assume we can resend that }
if FRequests[I].FBufferSendPos > 0 then
begin
needReconnect := true;
FRequests[I].FBufferSendPos := 0;
FRequests[I].SendPrivateBuffer;
end else
if FRequests[I].FBuffer.Memory = FRequests[I].FBuffer.Pos then
needReconnect := true
else
FRequests[I].EndRequest;
end;
if needReconnect then
Connect;
end;
procedure TLFastCGIClient.ErrorEvent(ASocket: TLHandle; const msg: string);
begin
if (FState = fsConnectingAgain)
or ((FState = fsConnecting) and (FPool.FSpawnState = ssSpawned)) then
begin
FRequest.DoEndRequest;
EndRequest(FRequest);
FState := fsIdle;
end else
if FState = fsConnecting then
begin
FPool.StartServer;
FState := fsStartingServer;
end;
end;
procedure TLFastCGIClient.HandleGetValuesResult;
var
lNameLen, lValueLen, lIntVal, lCode: integer;
lBufferPtr: pchar;
lPrevChar: char;
procedure GetIntVal;
begin
lPrevChar := lBufferPtr[lNameLen+lValueLen];
lBufferPtr[lNameLen+lValueLen] := #0;
Val(lBufferPtr+lNameLen, lIntVal, lCode);
lBufferPtr[lNameLen+lValueLen] := lPrevChar;
end;
begin
repeat
lBufferPtr := FBufferPos;
Inc(lBufferPtr, GetFastCGIStringSize(PByte(lBufferPtr), lNameLen));
Inc(lBufferPtr, GetFastCGIStringSize(PByte(lBufferPtr), lValueLen));
if lBufferPtr + lNameLen + lValueLen > FBufferEnd then exit;
if StrLComp(lBufferPtr, 'FCGI_MAX_REQS', lNameLen) = 0 then
begin
GetIntVal;
if (lCode = 0) and (FRequestsCount <> lIntVal) then
begin
FRequestsCount := lIntVal;
ReallocMem(FRequests, sizeof(TLFastCGIRequest)*lIntVal);
end;
end else
if StrLComp(lBufferPtr, 'FCGI_MAX_CONNS', lNameLen) = 0 then
begin
GetIntVal;
if lCode = 0 then
FPool.ClientsMax := lIntVal;
end;
Inc(lBufferPtr, lNameLen+lValueLen);
Dec(FContentLength, lBufferPtr-FBufferPos);
FBufferPos := lBufferPtr;
until FContentLength = 0;
end;
procedure TLFastCGIClient.HandleReceive(ASocket: TLSocket);
var
lRead: integer;
begin
lRead := Get(FBufferEnd^, DataBufferSize-PtrUInt(FBufferEnd-FBuffer));
if lRead = 0 then exit;
{ remote side has had chance to disconnect, clear buffer }
Inc(FBufferEnd, lRead);
ParseBuffer;
end;
procedure TLFastCGIClient.HandleSend(ASocket: TLSocket);
var
lRequest: TLFastCGIRequest;
begin
if FSendRequest = nil then exit;
lRequest := FSendRequest.FNextSend;
repeat
if not lRequest.SendPrivateBuffer or not lRequest.HandleSend then
exit;
lRequest.FNextSend := nil;
{ only this one left in list ? }
if FSendRequest = lRequest then
begin
FSendRequest := nil;
exit;
end else begin
lRequest := lRequest.FNextSend;
FSendRequest.FNextSend := lRequest;
end;
until false;
end;
procedure TLFastCGIClient.AddToSendQueue(ARequest: TLFastCGIRequest);
begin
if ARequest.FNextSend <> nil then exit;
if FSendRequest = nil then
FSendRequest := ARequest
else
ARequest.FNextSend := FSendRequest.FNextSend;
FSendRequest.FNextSend := ARequest;
end;
procedure TLFastCGIClient.ParseBuffer;
var
lHeader: PFCGI_Header;
lReqIndex: integer;
begin
repeat
case FState of
fsHeader:
begin
if FBufferEnd-FBufferPos < sizeof(FCGI_Header) then
exit;
lHeader := PFCGI_Header(FBufferPos);
FReqType := lHeader^.ReqType;
lReqIndex := (lHeader^.RequestIDB1 shl 8) or lHeader^.RequestIDB0;
FContentLength := (lHeader^.ContentLengthB1 shl 8) or lHeader^.ContentLengthB0;
FPaddingLength := lHeader^.PaddingLength;
Inc(FBufferPos, sizeof(lHeader^));
if lReqIndex > 0 then
Dec(lReqIndex);
if (lReqIndex < FRequestsCount) and (FRequests[lReqIndex] <> nil) then
begin
FRequest := FRequests[lReqIndex];
if FContentLength > 0 then
FState := fsData
else begin
FRequest.HandleReceiveEnd;
Flush;
end;
end else
Flush;
end;
fsData:
begin
FRequest.HandleReceive;
if FContentLength = 0 then
Flush
else begin
FRequest.FOutputPending := true;
exit;
end;
end;
fsFlush: Flush;
end;
until FBufferPos = FBufferEnd;
end;
procedure TLFastCGIClient.Flush;
function FlushSize(var ANumBytes: integer): boolean;
var
lFlushBytes: integer;
begin
lFlushBytes := ANumBytes;
if lFlushBytes > FBufferEnd - FBufferPos then
lFlushBytes := FBufferEnd - FBufferPos;
Dec(ANumBytes, lFlushBytes);
Inc(FBufferPos, lFlushBytes);
Result := ANumBytes = 0;
end;
begin
FState := fsFlush;
if FlushSize(FContentLength) and FlushSize(FPaddingLength) then
begin
{ buffer empty? reset }
if FBufferPos = FBufferEnd then
begin
FBufferPos := FBuffer;
FBufferEnd := FBuffer;
end;
FState := fsHeader;
FRequest := nil;
end;
end;
function TLFastCGIClient.CreateRequester: TLFastCGIRequest;
begin
if FRequests[FNextRequestID] = nil then
FRequests[FNextRequestID] := TLFastCGIRequest.Create;
Result := FRequests[FNextRequestID];
Inc(FNextRequestID);
Result.FClient := Self;
Result.ID := FNextRequestID; { request ids start at 1 }
end;
function TLFastCGIClient.Connect: Boolean;
begin
Result := inherited Connect(FPool.Host, FPool.Port);
FRequest := FRequests[0];
if FRequest.FBuffer.Pos = FRequest.FBuffer.Memory then
FRequest.SendGetValues;
if FState <> fsStartingServer then
FState := fsConnecting
else
FState := fsConnectingAgain;
end;
function TLFastCGIClient.BeginRequest(AType: integer): TLFastCGIRequest;
begin
if FFreeRequest <> nil then
begin
Result := FFreeRequest.FNextFree;
if FFreeRequest = FFreeRequest.FNextFree then
FFreeRequest := nil
else
FFreeRequest.FNextFree := FFreeRequest.FNextFree.FNextFree;
Result.FNextFree := nil;
end else
if FNextRequestID = FRequestsCount then
exit(nil)
else begin
Result := CreateRequester;
end;
if not Connected then
Connect;
Result.SendBeginRequest(AType);
Inc(FRequestsSent);
end;
procedure TLFastCGIClient.EndRequest(ARequest: TLFastCGIRequest);
begin
if FFreeRequest <> nil then
ARequest.FNextFree := FFreeRequest.FNextFree
else
FFreeRequest := ARequest;
FFreeRequest.FNextFree := ARequest;
if FPool <> nil then
FPool.EndRequest(Self);
end;
{ TLFastCGIPool }
constructor TLFastCGIPool.Create;
begin
FClientsMax := 1;
FMaxRequestsConn := 1;
inherited;
end;
destructor TLFastCGIPool.Destroy;
var
I: integer;
begin
for I := 0 to FClientsAvail-1 do
FClients[I].Free;
FreeMem(FClients);
if FTimer <> nil then
FTimer.Free;
inherited;
end;
function TLFastCGIPool.CreateClient: TLFastCGIClient;
begin
if FClientsAvail = FClientsCount then
begin
Inc(FClientsCount, 64);
ReallocMem(FClients, FClientsCount*sizeof(TLFastCGIRequest));
end;
Result := TLFastCGIClient.Create(nil);
Result.FPool := Self;
Result.Eventer := FEventer;
FClients[FClientsAvail] := Result;
Inc(FClientsAvail);
end;
function TLFastCGIPool.BeginRequest(AType: integer): TLFastCGIRequest;
var
lTempClient: TLFastCGIClient;
begin
Result := nil;
while FFreeClient <> nil do
begin
lTempClient := FFreeClient.FNextFree;
Result := lTempClient.BeginRequest(AType);
if Result <> nil then break;
{ Result = nil -> no free requesters on next free client }
if lTempClient = FFreeClient then
FFreeClient := nil
else
FFreeClient.FNextFree := lTempClient.FNextFree;
lTempClient.FNextFree := nil;
end;
{ all clients busy }
if Result = nil then
if FClientsAvail < FClientsMax then
Result := CreateClient.BeginRequest(AType);
end;
procedure TLFastCGIPool.EndRequest(AClient: TLFastCGIClient);
begin
{ TODO: wait for other requests to be completed }
if AClient.RequestsSent = FMaxRequestsConn then
AClient.Disconnect;
AddToFreeClients(AClient);
end;
procedure TLFastCGIPool.AddToFreeClients(AClient: TLFastCGIClient);
begin
if AClient.FNextFree <> nil then exit;
if FFreeClient = nil then
FFreeClient := AClient
else
AClient.FNextFree := FFreeClient.FNextFree;
FFreeClient.FNextFree := AClient;
end;
procedure TLFastCGIPool.ConnectClients(Sender: TObject);
var
I: integer;
begin
for I := 0 to FClientsAvail-1 do
if FClients[I].FState = fsStartingServer then
FClients[I].Connect;
end;
procedure TLFastCGIPool.StartServer;
begin
if FSpawnState = ssNone then
begin
FSpawnState := ssSpawning;
SpawnFCGIProcess(FAppName, FAppEnv, FPort);
if FTimer = nil then
FTimer := TLTimer.Create;
FTimer.OneShot := true;
FTimer.OnTimer := @ConnectClients;
end;
FTimer.Interval := 2000;
end;
end.
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