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rpc.pas
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rpc.pas
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{*************************************************************************************
This file is part of Transmission Remote GUI.
Copyright (c) 2008-2014 by Yury Sidorov.
Transmission Remote GUI is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Transmission Remote GUI 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Transmission Remote GUI; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*************************************************************************************}
unit rpc;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, httpsend, syncobjs, fpjson, jsonparser, ssl_openssl;
resourcestring
sTransmissionAt = 'Transmission%s at %s:%s';
const
DefaultRpcPath = '/transmission/rpc';
type
TAdvInfoType = (aiNone, aiGeneral, aiFiles, aiPeers, aiTrackers, aiStats);
TRefreshTypes = (rtTorrents, rtDetails, rtSession);
TRefreshType = set of TRefreshTypes;
TRpc = class;
{ TRpcThread }
TRpcThread = class(TThread)
private
ResultData: TJSONData;
FRpc: TRpc;
function GetAdvInfo: TAdvInfoType;
function GetCurTorrentId: cardinal;
function GetRefreshInterval: TDateTime;
function GetStatus: string;
procedure SetStatus(const AValue: string);
function GetTorrents: boolean;
procedure GetPeers(TorrentId: integer);
procedure GetFiles(TorrentId: integer);
procedure GetTrackers(TorrentId: integer);
procedure GetStats;
procedure GetInfo(TorrentId: integer);
procedure GetSessionInfo;
procedure DoFillTorrentsList;
procedure DoFillPeersList;
procedure DoFillFilesList;
procedure DoFillInfo;
procedure DoFillTrackersList;
procedure DoFillStats;
procedure DoFillSessionInfo;
procedure NotifyCheckStatus;
procedure CheckStatusHandler(Data: PtrInt);
protected
procedure Execute; override;
public
constructor Create;
destructor Destroy; override;
property Status: string read GetStatus write SetStatus;
property RefreshInterval: TDateTime read GetRefreshInterval;
property CurTorrentId: cardinal read GetCurTorrentId;
property AdvInfo: TAdvInfoType read GetAdvInfo;
end;
TRpc = class
private
FLock: TCriticalSection;
FStatus: string;
FInfoStatus: string;
FConnected: boolean;
FTorrentFields: string;
FRPCVersion: integer;
XTorrentSession: string;
FMainThreadId: TThreadID;
FRpcPath: string;
function GetConnected: boolean;
function GetConnecting: boolean;
function GetInfoStatus: string;
function GetStatus: string;
function GetTorrentFields: string;
procedure SetInfoStatus(const AValue: string);
procedure SetStatus(const AValue: string);
procedure SetTorrentFields(const AValue: string);
procedure CreateHttp;
public
Http: THTTPSend;
HttpLock: TCriticalSection;
RpcThread: TRpcThread;
Url: string;
RefreshInterval: TDateTime;
CurTorrentId: cardinal;
AdvInfo: TAdvInfoType;
RefreshNow: TRefreshType;
RequestFullInfo: boolean;
ReconnectAllowed: boolean;
RequestStartTime: TDateTime;
constructor Create;
destructor Destroy; override;
procedure InitSSL;
procedure Lock;
procedure Unlock;
procedure Connect;
procedure Disconnect;
function SendRequest(req: TJSONObject; ReturnArguments: boolean = True; ATimeOut: integer = -1): TJSONObject;
function RequestInfo(TorrentId: integer; const Fields: array of const; const ExtraFields: array of string): TJSONObject;
function RequestInfo(TorrentId: integer; const Fields: array of const): TJSONObject;
property Status: string read GetStatus write SetStatus;
property InfoStatus: string read GetInfoStatus write SetInfoStatus;
property Connected: boolean read GetConnected;
property Connecting: boolean read GetConnecting;
property TorrentFields: string read GetTorrentFields write SetTorrentFields;
property RPCVersion: integer read FRPCVersion;
property RpcPath: string read FRpcPath write FRpcPath;
end;
var
RemotePathDelimiter: char = '/';
implementation
uses Main, ssl_openssl_lib, synafpc, blcksock;
{ TRpcThread }
procedure TRpcThread.Execute;
var
t, tt: TDateTime;
i: integer;
ai: TAdvInfoType;
begin
try
GetSessionInfo;
NotifyCheckStatus;
if not FRpc.FConnected then
Terminate;
t:=Now - 1;
tt:=Now;
while not Terminated do begin
if Now - t >= RefreshInterval then begin
FRpc.RefreshNow:=FRpc.RefreshNow + [rtTorrents, rtDetails];
t:=Now;
end;
if Now - tt >= RefreshInterval*5 then begin
Include(FRpc.RefreshNow, rtSession);
tt:=Now;
end;
if Status = '' then
if rtTorrents in FRpc.RefreshNow then begin
GetTorrents;
Exclude(FRpc.RefreshNow, rtTorrents);
t:=Now;
end
else
if rtDetails in FRpc.RefreshNow then begin
i:=CurTorrentId;
ai:=AdvInfo;
if i <> 0 then begin
case ai of
aiGeneral:
GetInfo(i);
aiPeers:
GetPeers(i);
aiFiles:
GetFiles(i);
aiTrackers:
GetTrackers(i);
end;
end;
case ai of
aiStats:
GetStats;
end;
if (i = CurTorrentId) and (ai = AdvInfo) then
Exclude(FRpc.RefreshNow, rtDetails);
end
else
if rtSession in FRpc.RefreshNow then begin
GetSessionInfo;
Exclude(FRpc.RefreshNow, rtSession);
end;
if Status <> '' then begin
NotifyCheckStatus;
Sleep(100);
end;
if FRpc.RefreshNow = [] then
Sleep(50);
end;
except
Status:=Exception(ExceptObject).Message;
FRpc.RpcThread:=nil;
NotifyCheckStatus;
end;
FRpc.RpcThread:=nil;
FRpc.FConnected:=False;
FRpc.FRPCVersion:=0;
Sleep(20);
end;
constructor TRpcThread.Create;
begin
inherited Create(True);
end;
destructor TRpcThread.Destroy;
begin
inherited Destroy;
end;
procedure TRpcThread.SetStatus(const AValue: string);
begin
FRpc.Status:=AValue;
end;
procedure TRpcThread.DoFillTorrentsList;
begin
MainForm.FillTorrentsList(ResultData as TJSONArray);
end;
procedure TRpcThread.DoFillPeersList;
begin
MainForm.FillPeersList(ResultData as TJSONArray);
end;
procedure TRpcThread.DoFillFilesList;
var
t: TJSONObject;
dir: widestring;
begin
if ResultData = nil then begin
MainForm.ClearDetailsInfo;
exit;
end;
t:=ResultData as TJSONObject;
if RpcObj.RPCVersion >= 4 then
dir:=t.Strings['downloadDir']
else
dir:='';
MainForm.FillFilesList(t.Integers['id'], t.Arrays['files'], t.Arrays['priorities'], t.Arrays['wanted'], dir);
end;
procedure TRpcThread.DoFillInfo;
begin
MainForm.FillGeneralInfo(ResultData as TJSONObject);
end;
procedure TRpcThread.DoFillTrackersList;
begin
MainForm.FillTrackersList(ResultData as TJSONObject);
end;
procedure TRpcThread.DoFillStats;
begin
MainForm.FillStatistics(ResultData as TJSONObject);
end;
procedure TRpcThread.DoFillSessionInfo;
begin
MainForm.FillSessionInfo(ResultData as TJSONObject);
end;
procedure TRpcThread.NotifyCheckStatus;
begin
if not Terminated then
Application.QueueAsyncCall(@CheckStatusHandler, 0);
end;
procedure TRpcThread.CheckStatusHandler(Data: PtrInt);
begin
if csDestroying in MainForm.ComponentState then exit;
MainForm.CheckStatus;
end;
procedure TRpcThread.GetSessionInfo;
var
req, args, args2: TJSONObject;
s: string;
begin
req:=TJSONObject.Create;
try
req.Add('method', 'session-get');
args:=FRpc.SendRequest(req);
if args <> nil then
try
FRpc.FConnected:=True;
if args.IndexOfName('rpc-version') >= 0 then
FRpc.FRPCVersion := args.Integers['rpc-version']
else
FRpc.FRPCVersion := 0;
if args.IndexOfName('version') >= 0 then
s:=' ' + args.Strings['version']
else
s:='';
FRpc.InfoStatus:=Format(sTransmissionAt, [s, FRpc.Http.TargetHost, FRpc.Http.TargetPort]);
if FRpc.RPCVersion >= 15 then begin
// Requesting free space in download dir
req.Free;
req:=TJSONObject.Create;
req.Add('method', 'free-space');
args2:=TJSONObject.Create;
try
args2.Add('path', args.Strings['download-dir']);
req.Add('arguments', args2);
args2:=FRpc.SendRequest(req);
if args2 <> nil then
args.Floats['download-dir-free-space']:=args2.Floats['size-bytes']
else begin
args.Floats['download-dir-free-space']:=-1;
FRpc.Status:='';
end;
finally
args2.Free;
end;
end;
ResultData:=args;
if not Terminated then
Synchronize(@DoFillSessionInfo);
finally
args.Free;
end
else
ASSERT(FRpc.Status <> '');
finally
req.Free;
end;
end;
function TRpcThread.GetTorrents: boolean;
var
args: TJSONObject;
ExtraFields: array of string;
sl: TStringList;
i: integer;
begin
Result:=False;
sl:=TStringList.Create;
try
FRpc.Lock;
try
sl.CommaText:=FRpc.FTorrentFields;
finally
FRpc.Unlock;
end;
if FRpc.RPCVersion < 7 then begin
i:=sl.IndexOf('trackers');
if FRpc.RequestFullInfo then begin
if i < 0 then
sl.Add('trackers');
end
else
if i >= 0 then
sl.Delete(i);
end;
i:=sl.IndexOf('downloadDir');
if FRpc.RequestFullInfo then begin
if i < 0 then
sl.Add('downloadDir');
end
else
if i >= 0 then
sl.Delete(i);
SetLength(ExtraFields, sl.Count);
for i:=0 to sl.Count - 1 do
ExtraFields[i]:=sl[i];
finally
sl.Free;
end;
args:=FRpc.RequestInfo(0, ['id', 'name', 'status', 'errorString', 'announceResponse', 'recheckProgress',
'sizeWhenDone', 'leftUntilDone', 'rateDownload', 'rateUpload', 'trackerStats',
'metadataPercentComplete'], ExtraFields);
try
if (args <> nil) and not Terminated then begin
FRpc.RequestFullInfo:=False;
ResultData:=args.Arrays['torrents'];
Synchronize(@DoFillTorrentsList);
Result:=True;
end;
finally
args.Free;
end;
end;
procedure TRpcThread.GetPeers(TorrentId: integer);
var
args: TJSONObject;
t: TJSONArray;
begin
args:=FRpc.RequestInfo(TorrentId, ['peers']);
try
if args <> nil then begin
t:=args.Arrays['torrents'];
if t.Count > 0 then
ResultData:=t.Objects[0].Arrays['peers']
else
ResultData:=nil;
if not Terminated then
Synchronize(@DoFillPeersList);
end;
finally
args.Free;
end;
end;
procedure TRpcThread.GetFiles(TorrentId: integer);
var
args: TJSONObject;
t: TJSONArray;
begin
args:=FRpc.RequestInfo(TorrentId, ['id', 'files','priorities','wanted','downloadDir']);
try
if args <> nil then begin
t:=args.Arrays['torrents'];
if t.Count > 0 then
ResultData:=t.Objects[0]
else
ResultData:=nil;
if not Terminated then
Synchronize(@DoFillFilesList);
end;
finally
args.Free;
end;
end;
procedure TRpcThread.GetTrackers(TorrentId: integer);
var
args: TJSONObject;
t: TJSONArray;
begin
args:=FRpc.RequestInfo(TorrentId, ['id','trackers','trackerStats', 'nextAnnounceTime']);
try
if args <> nil then begin
t:=args.Arrays['torrents'];
if t.Count > 0 then
ResultData:=t.Objects[0]
else
ResultData:=nil;
if not Terminated then
Synchronize(@DoFillTrackersList);
end;
finally
args.Free;
end;
end;
procedure TRpcThread.GetStats;
var
req, args: TJSONObject;
begin
req:=TJSONObject.Create;
try
req.Add('method', 'session-stats');
args:=FRpc.SendRequest(req);
if args <> nil then
try
ResultData:=args;
if not Terminated then
Synchronize(@DoFillStats);
finally
args.Free;
end;
finally
req.Free;
end;
end;
procedure TRpcThread.GetInfo(TorrentId: integer);
var
args: TJSONObject;
t: TJSONArray;
begin
args:=FRpc.RequestInfo(TorrentId, ['totalSize', 'sizeWhenDone', 'leftUntilDone', 'pieceCount', 'pieceSize', 'haveValid',
'hashString', 'comment', 'downloadedEver', 'uploadedEver', 'corruptEver', 'errorString',
'announceResponse', 'downloadLimit', 'downloadLimitMode', 'uploadLimit', 'uploadLimitMode',
'maxConnectedPeers', 'nextAnnounceTime', 'dateCreated', 'creator', 'eta', 'peersSendingToUs',
'seeders','peersGettingFromUs','leechers', 'uploadRatio', 'addedDate', 'doneDate',
'activityDate', 'downloadLimited', 'uploadLimited', 'downloadDir', 'id', 'pieces',
'trackerStats', 'secondsDownloading', 'secondsSeeding']);
try
if args <> nil then begin
t:=args.Arrays['torrents'];
if t.Count > 0 then
ResultData:=t.Objects[0]
else
ResultData:=nil;
if not Terminated then
Synchronize(@DoFillInfo);
end;
finally
args.Free;
end;
end;
function TRpcThread.GetAdvInfo: TAdvInfoType;
begin
FRpc.Lock;
try
Result:=FRpc.AdvInfo;
finally
FRpc.Unlock;
end;
end;
function TRpcThread.GetCurTorrentId: cardinal;
begin
FRpc.Lock;
try
Result:=FRpc.CurTorrentId;
finally
FRpc.Unlock;
end;
end;
function TRpcThread.GetRefreshInterval: TDateTime;
begin
FRpc.Lock;
try
Result:=FRpc.RefreshInterval;
finally
FRpc.Unlock;
end;
end;
function TRpcThread.GetStatus: string;
begin
Result:=FRpc.Status;
end;
{ TRpc }
constructor TRpc.Create;
begin
inherited;
FMainThreadId:=GetCurrentThreadId;
FLock:=TCriticalSection.Create;
HttpLock:=TCriticalSection.Create;
RefreshNow:=[];
CreateHttp;
end;
destructor TRpc.Destroy;
begin
Http.Free;
HttpLock.Free;
FLock.Free;
inherited Destroy;
end;
procedure TRpc.InitSSL;
{$ifdef unix}
{$ifndef darwin}
procedure CheckOpenSSL;
const
OpenSSLVersions: array[1..2] of string =
('0.9.8', '1.0.0');
var
hLib1, hLib2: TLibHandle;
i: integer;
begin
for i:=Low(OpenSSLVersions) to High(OpenSSLVersions) do begin
hlib1:=LoadLibrary(PChar('libssl.so.' + OpenSSLVersions[i]));
hlib2:=LoadLibrary(PChar('libcrypto.so.' + OpenSSLVersions[i]));
if hLib2 <> 0 then
FreeLibrary(hLib2);
if hLib1 <> 0 then
FreeLibrary(hLib1);
if (hLib1 <> 0) and (hLib2 <> 0) then begin
DLLSSLName:='libssl.so.' + OpenSSLVersions[i];
DLLUtilName:='libcrypto.so.' + OpenSSLVersions[i];
break;
end;
end;
end;
{$endif darwin}
{$endif unix}
begin
if IsSSLloaded then exit;
{$ifdef unix}
{$ifndef darwin}
CheckOpenSSL;
{$endif darwin}
{$endif unix}
if InitSSLInterface then
SSLImplementation := TSSLOpenSSL;
CreateHttp;
end;
function TRpc.SendRequest(req: TJSONObject; ReturnArguments: boolean; ATimeOut: integer): TJSONObject;
var
obj: TJSONData;
res: TJSONObject;
jp: TJSONParser;
s: string;
i, j, OldTimeOut, RetryCnt: integer;
locked, r: boolean;
begin
if FRpcPath = '' then
FRpcPath:=DefaultRpcPath;
Status:='';
Result:=nil;
RetryCnt:=2;
i:=0;
repeat
Inc(i);
HttpLock.Enter;
locked:=True;
try
OldTimeOut:=Http.Timeout;
RequestStartTime:=Now;
Http.Document.Clear;
s:=req.AsJSON;
Http.Document.Write(PChar(s)^, Length(s));
s:='';
Http.Headers.Clear;
if XTorrentSession <> '' then
Http.Headers.Add(XTorrentSession);
if ATimeOut >= 0 then
Http.Timeout:=ATimeOut;
try
r:=Http.HTTPMethod('POST', Url + FRpcPath);
finally
Http.Timeout:=OldTimeOut;
end;
if not r then begin
if FMainThreadId <> GetCurrentThreadId then
ReconnectAllowed:=True;
Status:=Http.Sock.LastErrorDesc;
break;
end
else begin
if Http.ResultCode = 409 then begin
XTorrentSession:='';
for j:=0 to Http.Headers.Count - 1 do
if Pos('x-transmission-session-id:', AnsiLowerCase(Http.Headers[j])) > 0 then begin
XTorrentSession:=Http.Headers[j];
break;
end;
if XTorrentSession <> '' then begin
if i = RetryCnt then begin
if FMainThreadId <> GetCurrentThreadId then
ReconnectAllowed:=True;
Status:='Session ID error.';
end;
continue;
end;
end;
if Http.ResultCode = 301 then begin
s:=Trim(Http.Headers.Values['Location']);
if (s <> '') and (i = 1) then begin
j:=Length(s);
if Copy(s, j - 4, MaxInt) = '/web/' then
SetLength(s, j - 4)
else
if Copy(s, j - 3, MaxInt) = '/web' then
SetLength(s, j - 3);
FRpcPath:=s + 'rpc';
Inc(RetryCnt);
continue;
end;
end;
if Http.ResultCode <> 200 then begin
if Http.Headers.Count > 0 then begin
SetString(s, Http.Document.Memory, Http.Document.Size);
j:=Pos('<body>', LowerCase(s));
if j > 0 then
System.Delete(s, 1, j - 1);
s:=StringReplace(s, #13#10, '', [rfReplaceAll]);
s:=StringReplace(s, #13, '', [rfReplaceAll]);
s:=StringReplace(s, #10, '', [rfReplaceAll]);
s:=StringReplace(s, #9, ' ', [rfReplaceAll]);
s:=StringReplace(s, '"', '"', [rfReplaceAll, rfIgnoreCase]);
s:=StringReplace(s, '<br>', LineEnding, [rfReplaceAll, rfIgnoreCase]);
s:=StringReplace(s, '</p>', LineEnding, [rfReplaceAll, rfIgnoreCase]);
s:=StringReplace(s, '</h1>', LineEnding, [rfReplaceAll, rfIgnoreCase]);
s:=StringReplace(s, '<li>', LineEnding+'* ', [rfReplaceAll, rfIgnoreCase]);
j:=1;
while j <= Length(s) do begin
if s[j] = '<' then begin
while (j <= Length(s)) and (s[j] <> '>') do
System.Delete(s, j, 1);
System.Delete(s, j, 1);
end
else
Inc(j);
end;
while Pos(' ', s) > 0 do
s:=StringReplace(s, ' ', ' ', [rfReplaceAll]);
while Pos(LineEnding + ' ', s) > 0 do
s:=StringReplace(s, LineEnding + ' ', LineEnding, [rfReplaceAll]);
s:=Trim(s);
end
else
s:='';
if s = '' then begin
s:=Http.ResultString;
if s = '' then
if Http.ResultCode = 0 then
s:='Invalid server response.'
else
s:=Format('HTTP error: %d', [Http.ResultCode]);
end;
Status:=s;
break;
end;
Http.Document.Position:=0;
jp:=TJSONParser.Create(Http.Document);
HttpLock.Leave;
locked:=False;
RequestStartTime:=0;
try
try
obj:=jp.Parse;
Http.Document.Clear;
finally
jp.Free;
end;
except
on E: Exception do
begin
Status:=e.Message;
break;
end;
end;
try
if obj is TJSONObject then begin
res:=obj as TJSONObject;
s:=res.Strings['result'];
if AnsiCompareText(s, 'success') <> 0 then begin
if Trim(s) = '' then
s:='Unknown error.';
Status:=s;
end
else begin
if ReturnArguments then begin
Result:=res.Objects['arguments'];
if Result = nil then
Status:='Arguments object not found.'
else begin
res.Extract(Result);
FreeAndNil(obj);
end;
end
else
Result:=res;
if Result <> nil then
obj:=nil;
end;
break;
end
else begin
Status:='Invalid server response.';
break;
end;
finally
obj.Free;
end;
end;
finally
RequestStartTime:=0;
if locked then
HttpLock.Leave;
end;
until i >= RetryCnt;
end;
function TRpc.RequestInfo(TorrentId: integer; const Fields: array of const; const ExtraFields: array of string): TJSONObject;
var
req, args: TJSONObject;
_fields: TJSONArray;
i: integer;
begin
Result:=nil;
req:=TJSONObject.Create;
try
req.Add('method', 'torrent-get');
args:=TJSONObject.Create;
if TorrentId <> 0 then
args.Add('ids', TJSONArray.Create([TorrentId]));
_fields:=TJSONArray.Create(Fields);
for i:=Low(ExtraFields) to High(ExtraFields) do
_fields.Add(ExtraFields[i]);
args.Add('fields', _fields);
req.Add('arguments', args);
Result:=SendRequest(req);
finally
req.Free;
end;
end;
function TRpc.RequestInfo(TorrentId: integer; const Fields: array of const): TJSONObject;
begin
Result:=RequestInfo(TorrentId, Fields, []);
end;
function TRpc.GetStatus: string;
begin
Lock;
try
Result:=FStatus;
UniqueString(Result);
finally
Unlock;
end;
end;
function TRpc.GetTorrentFields: string;
begin
Lock;
try
Result:=FTorrentFields;
UniqueString(Result);
finally
Unlock;
end;
end;
procedure TRpc.SetInfoStatus(const AValue: string);
begin
Lock;
try
FInfoStatus:=AValue;
UniqueString(FStatus);
finally
Unlock;
end;
end;
function TRpc.GetConnected: boolean;
begin
Result:=Assigned(RpcThread) and FConnected;
end;
function TRpc.GetConnecting: boolean;
begin
Result:=not FConnected and Assigned(RpcThread);
end;
function TRpc.GetInfoStatus: string;
begin
Lock;
try
Result:=FInfoStatus;
UniqueString(Result);
finally
Unlock;
end;
end;
procedure TRpc.SetStatus(const AValue: string);
begin
Lock;
try
FStatus:=AValue;
UniqueString(FStatus);
finally
Unlock;
end;
end;
procedure TRpc.SetTorrentFields(const AValue: string);
begin
Lock;
try
FTorrentFields:=AValue;
UniqueString(FTorrentFields);
finally
Unlock;
end;
end;
procedure TRpc.CreateHttp;
begin
Http.Free;
Http:=THTTPSend.Create;
Http.Protocol:='1.1';
Http.Timeout:=30000;
Http.Headers.NameValueSeparator:=':';
end;
procedure TRpc.Lock;
begin
FLock.Enter;
end;
procedure TRpc.Unlock;
begin
FLock.Leave;
end;
procedure TRpc.Connect;
begin
CurTorrentId:=0;
XTorrentSession:='';
RequestFullInfo:=True;
ReconnectAllowed:=False;
RefreshNow:=[];
RpcThread:=TRpcThread.Create;
with RpcThread do begin
FreeOnTerminate:=True;
FRpc:=Self;
Suspended:=False;
end;
end;
procedure TRpc.Disconnect;
begin
if Assigned(RpcThread) then begin
RpcThread.Terminate;
while Assigned(RpcThread) do begin
Application.ProcessMessages;
try
Http.Sock.CloseSocket;
except
end;
Sleep(20);
end;
end;
Status:='';
RequestStartTime:=0;
FRpcPath:='';
end;
end.