src/TGitCache/TGITCache.cpp

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // External Cache Copyright (C) 2005 - 2006,2010 - Will Dean, Stefan Kueng
   4 // Copyright (C) 2008-2012 - TortoiseGit
   5
   6 // This program is free software; you can redistribute it and/or
   7 // modify it under the terms of the GNU General Public License
   8 // as published by the Free Software Foundation; either version 2
   9 // of the License, or (at your option) any later version.
  10
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software Foundation,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 //
  20
  21 #include "stdafx.h"
  22 #include "shellapi.h"
  23 #include "TGITCache.h"
  24 #include "GitStatusCache.h"
  25 #include "CacheInterface.h"
  26 #include "Resource.h"
  27 #include "registry.h"
  28 #include "CrashReport.h"
  29 #include "GitAdminDir.h"
  30 #include "Dbt.h"
  31 #include <initguid.h>
  32 #include "ioevent.h"
  33 #include "..\version.h"
  34 //#include "svn_dso.h"
  35 #include "SmartHandle.h"
  36
  37 #include <ShellAPI.h>
  38
  39 #ifndef GET_X_LPARAM
  40 #define GET_X_LPARAM(lp)                        ((int)(short)LOWORD(lp))
  41 #endif
  42 #ifndef GET_Y_LPARAM
  43 #define GET_Y_LPARAM(lp)                        ((int)(short)HIWORD(lp))
  44 #endif
  45
  46
  47 #pragma comment(linker, "\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
  48
  49 CCrashReportTGit crasher(L"TGitCache " _T(APP_X64_STRING));
  50
  51 DWORD WINAPI            InstanceThread(LPVOID);
  52 DWORD WINAPI            PipeThread(LPVOID);
  53 DWORD WINAPI            CommandWaitThread(LPVOID);
  54 DWORD WINAPI            CommandThread(LPVOID);
  55 LRESULT CALLBACK        WndProc(HWND, UINT, WPARAM, LPARAM);
  56 bool                            bRun = true;
  57 NOTIFYICONDATA          niData;
  58 HWND                            hWnd;
  59 HWND                            hTrayWnd;
  60 TCHAR                           szCurrentCrawledPath[MAX_CRAWLEDPATHS][MAX_CRAWLEDPATHSLEN];
  61 int                                     nCurrentCrawledpathIndex = 0;
  62 CComAutoCriticalSection critSec;
  63
  64 volatile LONG           nThreadCount = 0;
  65
  66 #define PACKVERSION(major,minor) MAKELONG(minor,major)
  67
  68 void DebugOutputLastError()
  69 {
  70         LPVOID lpMsgBuf;
  71         if (!FormatMessage(
  72                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
  73                 FORMAT_MESSAGE_FROM_SYSTEM |
  74                 FORMAT_MESSAGE_IGNORE_INSERTS,
  75                 NULL,
  76                 GetLastError(),
  77                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
  78                 (LPTSTR) &lpMsgBuf,
  79                 0,
  80                 NULL ))
  81         {
  82                 return;
  83         }
  84
  85         // Display the string.
  86         OutputDebugStringA("TGitCache GetLastError(): ");
  87         OutputDebugString((LPCTSTR)lpMsgBuf);
  88         OutputDebugStringA("\n");
  89
  90         // Free the buffer.
  91         LocalFree( lpMsgBuf );
  92 }
  93
  94 int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/, LPSTR /*lpCmdLine*/, int /*cmdShow*/)
  95 {
  96         SetDllDirectory(L"");
  97         CAutoGeneralHandle hReloadProtection = ::CreateMutex(NULL, FALSE, GetCacheMutexName());
  98
  99         if ((!hReloadProtection) || (GetLastError() == ERROR_ALREADY_EXISTS))
 100         {
 101                 // An instance of TGitCache is already running
 102                 ATLTRACE("TGitCache ignoring restart\n");
 103                 return 0;
 104         }
 105
 106         CGitStatusCache::Create();
 107         CGitStatusCache::Instance().Init();
 108
 109         SecureZeroMemory(szCurrentCrawledPath, sizeof(szCurrentCrawledPath));
 110
 111         DWORD dwThreadId;
 112         MSG msg;
 113         TCHAR szWindowClass[] = {TGIT_CACHE_WINDOW_NAME};
 114
 115         // create a hidden window to receive window messages.
 116         WNDCLASSEX wcex;
 117         wcex.cbSize = sizeof(WNDCLASSEX);
 118         wcex.style                      = CS_HREDRAW | CS_VREDRAW;
 119         wcex.lpfnWndProc        = (WNDPROC)WndProc;
 120         wcex.cbClsExtra         = 0;
 121         wcex.cbWndExtra         = 0;
 122         wcex.hInstance          = hInstance;
 123         wcex.hIcon                      = 0;
 124         wcex.hCursor            = 0;
 125         wcex.hbrBackground      = 0;
 126         wcex.lpszMenuName       = NULL;
 127         wcex.lpszClassName      = szWindowClass;
 128         wcex.hIconSm            = 0;
 129         RegisterClassEx(&wcex);
 130         hWnd = CreateWindow(TGIT_CACHE_WINDOW_NAME, TGIT_CACHE_WINDOW_NAME, WS_CAPTION, 0, 0, 800, 300, NULL, 0, hInstance, 0);
 131         hTrayWnd = hWnd;
 132         if (hWnd == NULL)
 133         {
 134                 return 0;
 135         }
 136         if (CRegStdDWORD(_T("Software\\TortoiseGit\\CacheTrayIcon"), FALSE)==TRUE)
 137         {
 138                 SecureZeroMemory(&niData,sizeof(NOTIFYICONDATA));
 139
 140                 DWORD dwMajor = 0;
 141                 DWORD dwMinor = 0;
 142                 AtlGetShellVersion(&dwMajor, &dwMinor);
 143                 DWORD dwVersion = PACKVERSION(dwMajor, dwMinor);
 144                 if (dwVersion >= PACKVERSION(6,0))
 145                         niData.cbSize = sizeof(NOTIFYICONDATA);
 146                 else if (dwVersion >= PACKVERSION(5,0))
 147                         niData.cbSize = NOTIFYICONDATA_V2_SIZE;
 148                 else
 149                         niData.cbSize = NOTIFYICONDATA_V1_SIZE;
 150
 151                 niData.uID = TRAY_ID;           // own tray icon ID
 152                 niData.hWnd      = hWnd;
 153                 niData.uFlags = NIF_ICON|NIF_MESSAGE;
 154
 155                 // load the icon
 156                 niData.hIcon =
 157                         (HICON)LoadImage(hInstance,
 158                         MAKEINTRESOURCE(IDI_TGITCACHE),
 159                         IMAGE_ICON,
 160                         GetSystemMetrics(SM_CXSMICON),
 161                         GetSystemMetrics(SM_CYSMICON),
 162                         LR_DEFAULTCOLOR);
 163
 164                 // set the message to send
 165                 // note: the message value should be in the
 166                 // range of WM_APP through 0xBFFF
 167                 niData.uCallbackMessage = TRAY_CALLBACK;
 168                 Shell_NotifyIcon(NIM_ADD,&niData);
 169                 // free icon handle
 170                 if(niData.hIcon && DestroyIcon(niData.hIcon))
 171                         niData.hIcon = NULL;
 172         }
 173
 174         // Create a thread which waits for incoming pipe connections
 175         CAutoGeneralHandle hPipeThread = CreateThread(
 176                 NULL,              // no security attribute
 177                 0,                 // default stack size
 178                 PipeThread,
 179                 (LPVOID) &bRun,    // thread parameter
 180                 0,                 // not suspended
 181                 &dwThreadId);      // returns thread ID
 182
 183         if (!hPipeThread)
 184         {
 185                 //OutputDebugStringA("TSVNCache: Could not create pipe thread\n");
 186                 //DebugOutputLastError();
 187                 return 0;
 188         }
 189         else hPipeThread.CloseHandle();
 190
 191         // Create a thread which waits for incoming pipe connections
 192         CAutoGeneralHandle hCommandWaitThread = CreateThread(
 193                 NULL,              // no security attribute
 194                 0,                 // default stack size
 195                 CommandWaitThread,
 196                 (LPVOID) &bRun,    // thread parameter
 197                 0,                 // not suspended
 198                 &dwThreadId);      // returns thread ID
 199
 200         if (!hCommandWaitThread)
 201         {
 202                 //OutputDebugStringA("TSVNCache: Could not create command wait thread\n");
 203                 //DebugOutputLastError();
 204                 return 0;
 205         }
 206
 207
 208         // loop to handle window messages.
 209         BOOL bLoopRet;
 210         while (bRun)
 211         {
 212                 bLoopRet = GetMessage(&msg, NULL, 0, 0);
 213                 if ((bLoopRet != -1)&&(bLoopRet != 0))
 214                 {
 215                         DispatchMessage(&msg);
 216                 }
 217         }
 218
 219         bRun = false;
 220
 221         Shell_NotifyIcon(NIM_DELETE,&niData);
 222         CGitStatusCache::Destroy();
 223
 224         return 0;
 225 }
 226
 227 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 228 {
 229         switch (message)
 230         {
 231         case TRAY_CALLBACK:
 232         {
 233                 switch(lParam)
 234                 {
 235                 case WM_LBUTTONDBLCLK:
 236                         if (IsWindowVisible(hWnd))
 237                                 ShowWindow(hWnd, SW_HIDE);
 238                         else
 239                                 ShowWindow(hWnd, SW_RESTORE);
 240                         break;
 241                 case WM_MOUSEMOVE:
 242                         {
 243                                 CString sInfoTip;
 244                                 NOTIFYICONDATA SystemTray;
 245                                 sInfoTip.Format(_T("Cached Directories : %ld\nWatched paths : %ld"),
 246                                         CGitStatusCache::Instance().GetCacheSize(),
 247                                         CGitStatusCache::Instance().GetNumberOfWatchedPaths());
 248
 249                                 SystemTray.cbSize = sizeof(NOTIFYICONDATA);
 250                                 SystemTray.hWnd   = hTrayWnd;
 251                                 SystemTray.uID    = TRAY_ID;
 252                                 SystemTray.uFlags = NIF_TIP;
 253                                 _tcscpy_s(SystemTray.szTip, sInfoTip);
 254                                 Shell_NotifyIcon(NIM_MODIFY, &SystemTray);
 255                         }
 256                         break;
 257                 case WM_RBUTTONUP:
 258                 case WM_CONTEXTMENU:
 259                         {
 260                                 POINT pt;
 261                                 DWORD ptW = GetMessagePos();
 262                                 pt.x = GET_X_LPARAM(ptW);
 263                                 pt.y = GET_Y_LPARAM(ptW);
 264                                 HMENU hMenu = CreatePopupMenu();
 265                                 if(hMenu)
 266                                 {
 267                                         InsertMenu(hMenu, (UINT)-1, MF_BYPOSITION, TRAYPOP_EXIT, _T("Exit"));
 268                                         SetForegroundWindow(hWnd);
 269                                         TrackPopupMenu(hMenu, TPM_BOTTOMALIGN, pt.x, pt.y, 0, hWnd, NULL);
 270                                         DestroyMenu(hMenu);
 271                                 }
 272                         }
 273                         break;
 274                 }
 275         }
 276         break;
 277         case WM_PAINT:
 278                 {
 279                         PAINTSTRUCT ps;
 280                         HDC hdc = BeginPaint(hWnd, &ps);
 281                         RECT rect;
 282                         GetClientRect(hWnd, &rect);
 283                         // clear the background
 284                         HBRUSH background = CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
 285                         HGDIOBJ oldbrush = SelectObject(hdc, background);
 286                         FillRect(hdc, &rect, background);
 287
 288                         int line = 0;
 289                         SIZE fontsize = {0};
 290                         AutoLocker print(critSec);
 291                         GetTextExtentPoint32( hdc, szCurrentCrawledPath[0], (int)_tcslen(szCurrentCrawledPath[0]), &fontsize );
 292                         for (int i=nCurrentCrawledpathIndex; i<MAX_CRAWLEDPATHS; ++i)
 293                         {
 294                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 295                                 line++;
 296                         }
 297                         for (int i=0; i<nCurrentCrawledpathIndex; ++i)
 298                         {
 299                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 300                                 line++;
 301                         }
 302
 303
 304                         SelectObject(hdc,oldbrush);
 305                         EndPaint(hWnd, &ps);
 306                         DeleteObject(background);
 307                         return 0L;
 308                 }
 309                 break;
 310         case WM_COMMAND:
 311                 {
 312                         WORD wmId    = LOWORD(wParam);
 313
 314                         switch (wmId)
 315                         {
 316                         case TRAYPOP_EXIT:
 317                                 DestroyWindow(hWnd);
 318                                 break;
 319                         }
 320                         return 1;
 321                 }
 322         case WM_QUERYENDSESSION:
 323                 {
 324                         ATLTRACE("WM_QUERYENDSESSION\n");
 325                         CAutoWriteWeakLock writeLock(CGitStatusCache::Instance().GetGuard(), 200);
 326                         CGitStatusCache::Instance().Stop();
 327                         return TRUE;
 328                 }
 329                 break;
 330         case WM_CLOSE:
 331         case WM_ENDSESSION:
 332         case WM_DESTROY:
 333         case WM_QUIT:
 334                 {
 335                         ATLTRACE("WM_CLOSE/DESTROY/ENDSESSION/QUIT\n");
 336                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 337                         CGitStatusCache::Instance().Stop();
 338                         CGitStatusCache::Instance().SaveCache();
 339                         if (message != WM_QUIT)
 340                                 PostQuitMessage(0);
 341                         bRun = false;
 342                         return 1;
 343                 }
 344                 break;
 345         case WM_DEVICECHANGE:
 346                 {
 347                         DEV_BROADCAST_HDR * phdr = (DEV_BROADCAST_HDR*)lParam;
 348                         switch (wParam)
 349                         {
 350                         case DBT_CUSTOMEVENT:
 351                                 {
 352                                         ATLTRACE("WM_DEVICECHANGE with DBT_CUSTOMEVENT\n");
 353                                         if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 354                                         {
 355                                                 DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 356                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_DISMOUNT))
 357                                                 {
 358                                                         ATLTRACE("Device to be dismounted\n");
 359                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 360                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_hdevnotify);
 361                                                 }
 362                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_LOCK))
 363                                                 {
 364                                                         ATLTRACE("Device lock event\n");
 365                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 366                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_hdevnotify);
 367                                                 }
 368                                         }
 369                                 }
 370                                 break;
 371                         case DBT_DEVICEREMOVEPENDING:
 372                                 ATLTRACE("WM_DEVICECHANGE with DBT_DEVICEREMOVEPENDING\n");
 373                                 if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 374                                 {
 375                                         DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 376                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 377                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_hdevnotify);
 378                                 }
 379                                 else
 380                                 {
 381                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 382                                         CGitStatusCache::Instance().CloseWatcherHandles(INVALID_HANDLE_VALUE);
 383                                 }
 384                                 break;
 385                         case DBT_DEVICEQUERYREMOVE:
 386                                 ATLTRACE("WM_DEVICECHANGE with DBT_DEVICEQUERYREMOVE\n");
 387                                 if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 388                                 {
 389                                         DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 390                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 391                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_hdevnotify);
 392                                 }
 393                                 else
 394                                 {
 395                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 396                                         CGitStatusCache::Instance().CloseWatcherHandles(INVALID_HANDLE_VALUE);
 397                                 }
 398                                 break;
 399                         case DBT_DEVICEREMOVECOMPLETE:
 400                                 ATLTRACE("WM_DEVICECHANGE with DBT_DEVICEREMOVECOMPLETE\n");
 401                                 if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 402                                 {
 403                                         DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 404                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 405                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_hdevnotify);
 406                                 }
 407                                 else
 408                                 {
 409                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 410                                         CGitStatusCache::Instance().CloseWatcherHandles(INVALID_HANDLE_VALUE);
 411                                 }
 412                                 break;
 413                         }
 414                 }
 415                 break;
 416         default:
 417                 break;
 418         }
 419         return DefWindowProc(hWnd, message, wParam, lParam);
 420 }
 421
 422 //////////////////////////////////////////////////////////////////////////
 423
 424 VOID GetAnswerToRequest(const TGITCacheRequest* pRequest, TGITCacheResponse* pReply, DWORD* pResponseLength)
 425 {
 426         CTGitPath path;
 427         *pResponseLength = 0;
 428         if(pRequest->flags & TGITCACHE_FLAGS_FOLDERISKNOWN)
 429         {
 430                 path.SetFromWin(pRequest->path, !!(pRequest->flags & TGITCACHE_FLAGS_ISFOLDER));
 431         }
 432         else
 433         {
 434                 path.SetFromWin(pRequest->path);
 435         }
 436
 437         CAutoReadWeakLock readLock(CGitStatusCache::Instance().GetGuard(), 2000);
 438         if (readLock.IsAcquired())
 439         {
 440                 CGitStatusCache::Instance().GetStatusForPath(path, pRequest->flags, false).BuildCacheResponse(*pReply, *pResponseLength);
 441         }
 442         else
 443         {
 444                 CStatusCacheEntry entry;
 445                 entry.BuildCacheResponse(*pReply, *pResponseLength);
 446         }
 447 }
 448
 449 DWORD WINAPI PipeThread(LPVOID lpvParam)
 450 {
 451         ATLTRACE("PipeThread started\n");
 452         bool * bRun = (bool *)lpvParam;
 453         // The main loop creates an instance of the named pipe and
 454         // then waits for a client to connect to it. When the client
 455         // connects, a thread is created to handle communications
 456         // with that client, and the loop is repeated.
 457         DWORD dwThreadId;
 458         BOOL fConnected;
 459         CAutoFile hPipe;
 460
 461         while (*bRun)
 462         {
 463                 hPipe = CreateNamedPipe(
 464                         GetCachePipeName(),
 465                         PIPE_ACCESS_DUPLEX,       // read/write access
 466                         PIPE_TYPE_MESSAGE |       // message type pipe
 467                         PIPE_READMODE_MESSAGE |   // message-read mode
 468                         PIPE_WAIT,                // blocking mode
 469                         PIPE_UNLIMITED_INSTANCES, // max. instances
 470                         BUFSIZE,                  // output buffer size
 471                         BUFSIZE,                  // input buffer size
 472                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 473                         NULL);                                    // NULL DACL
 474
 475                 if (!hPipe)
 476                 {
 477                         //OutputDebugStringA("TSVNCache: CreatePipe failed\n");
 478                         //DebugOutputLastError();
 479                         if (*bRun)
 480                                 Sleep(200);
 481                         continue; // never leave the thread!
 482                 }
 483
 484                 // Wait for the client to connect; if it succeeds,
 485                 // the function returns a nonzero value. If the function returns
 486                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 487                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 488                 if (fConnected)
 489                 {
 490                         // Create a thread for this client.
 491                         CAutoGeneralHandle hInstanceThread = CreateThread(
 492                                 NULL,              // no security attribute
 493                                 0,                 // default stack size
 494                                 InstanceThread,
 495                                 (HANDLE) hPipe,    // thread parameter
 496                                 0,                 // not suspended
 497                                 &dwThreadId);      // returns thread ID
 498
 499                         if (!hInstanceThread)
 500                         {
 501                                 //OutputDebugStringA("TSVNCache: Could not create Instance thread\n");
 502                                 //DebugOutputLastError();
 503                                 DisconnectNamedPipe(hPipe);
 504                                 // since we're now closing this thread, we also have to close the whole application!
 505                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 506                                 // but no pipe will be available anymore.
 507                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 508                                 return 1;
 509                         }
 510                         // detach the handle, since we passed it to the thread
 511                         hPipe.Detach();
 512                 }
 513                 else
 514                 {
 515                         // The client could not connect, so close the pipe.
 516                         //OutputDebugStringA("TSVNCache: ConnectNamedPipe failed\n");
 517                         //DebugOutputLastError();
 518                         hPipe.CloseHandle();
 519                         if (*bRun)
 520                                 Sleep(200);
 521                         continue;       // don't end the thread!
 522                 }
 523         }
 524         ATLTRACE("Pipe thread exited\n");
 525         return 0;
 526 }
 527
 528 DWORD WINAPI CommandWaitThread(LPVOID lpvParam)
 529 {
 530         ATLTRACE("CommandWaitThread started\n");
 531         bool * bRun = (bool *)lpvParam;
 532         // The main loop creates an instance of the named pipe and
 533         // then waits for a client to connect to it. When the client
 534         // connects, a thread is created to handle communications
 535         // with that client, and the loop is repeated.
 536         DWORD dwThreadId;
 537         BOOL fConnected;
 538         CAutoFile hPipe;
 539
 540         while (*bRun)
 541         {
 542                 hPipe = CreateNamedPipe(
 543                         GetCacheCommandPipeName(),
 544                         PIPE_ACCESS_DUPLEX,       // read/write access
 545                         PIPE_TYPE_MESSAGE |       // message type pipe
 546                         PIPE_READMODE_MESSAGE |   // message-read mode
 547                         PIPE_WAIT,                // blocking mode
 548                         PIPE_UNLIMITED_INSTANCES, // max. instances
 549                         BUFSIZE,                  // output buffer size
 550                         BUFSIZE,                  // input buffer size
 551                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 552                         NULL);                // NULL DACL
 553
 554                 if (!hPipe)
 555                 {
 556                         //OutputDebugStringA("TSVNCache: CreatePipe failed\n");
 557                         //DebugOutputLastError();
 558                         if (*bRun)
 559                                 Sleep(200);
 560                         continue; // never leave the thread!
 561                 }
 562
 563                 // Wait for the client to connect; if it succeeds,
 564                 // the function returns a nonzero value. If the function returns
 565                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 566                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 567                 if (fConnected)
 568                 {
 569                         // Create a thread for this client.
 570                         CAutoGeneralHandle hCommandThread = CreateThread(
 571                                 NULL,              // no security attribute
 572                                 0,                 // default stack size
 573                                 CommandThread,
 574                                 (HANDLE) hPipe,    // thread parameter
 575                                 0,                 // not suspended
 576                                 &dwThreadId);      // returns thread ID
 577
 578                         if (!hCommandThread)
 579                         {
 580                                 //OutputDebugStringA("TSVNCache: Could not create Command thread\n");
 581                                 //DebugOutputLastError();
 582                                 DisconnectNamedPipe(hPipe);
 583                                 hPipe.CloseHandle();
 584                                 // since we're now closing this thread, we also have to close the whole application!
 585                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 586                                 // but no pipe will be available anymore.
 587                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 588                                 return 1;
 589                         }
 590                         // detach the handle, since we passed it to the thread
 591                         hPipe.Detach();
 592                 }
 593                 else
 594                 {
 595                         // The client could not connect, so close the pipe.
 596                         //OutputDebugStringA("TSVNCache: ConnectNamedPipe failed\n");
 597                         //DebugOutputLastError();
 598                         hPipe.CloseHandle();
 599                         if (*bRun)
 600                                 Sleep(200);
 601                         continue;       // don't end the thread!
 602                 }
 603         }
 604         ATLTRACE("CommandWait thread exited\n");
 605         return 0;
 606 }
 607
 608 DWORD WINAPI InstanceThread(LPVOID lpvParam)
 609 {
 610         ATLTRACE("InstanceThread started\n");
 611         TGITCacheResponse response;
 612         DWORD cbBytesRead, cbWritten;
 613         BOOL fSuccess;
 614         CAutoFile hPipe;
 615
 616         // The thread's parameter is a handle to a pipe instance.
 617
 618         hPipe = lpvParam;
 619         InterlockedIncrement(&nThreadCount);
 620         while (bRun)
 621         {
 622                 // Read client requests from the pipe.
 623                 TGITCacheRequest request;
 624                 fSuccess = ReadFile(
 625                         hPipe,        // handle to pipe
 626                         &request,    // buffer to receive data
 627                         sizeof(request), // size of buffer
 628                         &cbBytesRead, // number of bytes read
 629                         NULL);        // not overlapped I/O
 630
 631                 if (! fSuccess || cbBytesRead == 0)
 632                 {
 633                         DisconnectNamedPipe(hPipe);
 634                         ATLTRACE("Instance thread exited\n");
 635                         InterlockedDecrement(&nThreadCount);
 636                         if (nThreadCount == 0)
 637                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 638                         return 1;
 639                 }
 640
 641                 DWORD responseLength;
 642                 GetAnswerToRequest(&request, &response, &responseLength);
 643
 644                 // Write the reply to the pipe.
 645                 fSuccess = WriteFile(
 646                         hPipe,        // handle to pipe
 647                         &response,      // buffer to write from
 648                         responseLength, // number of bytes to write
 649                         &cbWritten,   // number of bytes written
 650                         NULL);        // not overlapped I/O
 651
 652                 if (! fSuccess || responseLength != cbWritten)
 653                 {
 654                         DisconnectNamedPipe(hPipe);
 655                         ATLTRACE("Instance thread exited\n");
 656                         InterlockedDecrement(&nThreadCount);
 657                         if (nThreadCount == 0)
 658                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 659                         return 1;
 660                 }
 661         }
 662
 663         // Flush the pipe to allow the client to read the pipe's contents
 664         // before disconnecting. Then disconnect the pipe, and close the
 665         // handle to this pipe instance.
 666
 667         FlushFileBuffers(hPipe);
 668         DisconnectNamedPipe(hPipe);
 669         ATLTRACE("Instance thread exited\n");
 670         InterlockedDecrement(&nThreadCount);
 671         if (nThreadCount == 0)
 672                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 673         return 0;
 674 }
 675
 676 DWORD WINAPI CommandThread(LPVOID lpvParam)
 677 {
 678         ATLTRACE("CommandThread started\n");
 679         DWORD cbBytesRead;
 680         BOOL fSuccess;
 681         CAutoFile hPipe;
 682
 683         // The thread's parameter is a handle to a pipe instance.
 684
 685         hPipe = lpvParam;
 686
 687         while (bRun)
 688         {
 689                 // Read client requests from the pipe.
 690                 TGITCacheCommand command;
 691                 fSuccess = ReadFile(
 692                         hPipe,                          // handle to pipe
 693                         &command,                       // buffer to receive data
 694                         sizeof(command),        // size of buffer
 695                         &cbBytesRead,           // number of bytes read
 696                         NULL);                          // not overlapped I/O
 697
 698                 if (! fSuccess || cbBytesRead == 0)
 699                 {
 700                         DisconnectNamedPipe(hPipe);
 701                         ATLTRACE("Command thread exited\n");
 702                         return 1;
 703                 }
 704
 705                 switch (command.command)
 706                 {
 707                         case TGITCACHECOMMAND_END:
 708                                 FlushFileBuffers(hPipe);
 709                                 DisconnectNamedPipe(hPipe);
 710                                 ATLTRACE("Command thread exited\n");
 711                                 return 0;
 712                         case TGITCACHECOMMAND_CRAWL:
 713                                 {
 714                                         CTGitPath changedpath;
 715                                         changedpath.SetFromWin(command.path, true);
 716                                         // remove the path from our cache - that will 'invalidate' it.
 717                                         {
 718                                                 CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 719                                                 CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 720                                         }
 721                                         CGitStatusCache::Instance().AddFolderForCrawling(changedpath.GetDirectory());
 722                                 }
 723                                 break;
 724                         case TGITCACHECOMMAND_REFRESHALL:
 725                                 {
 726                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 727                                         CGitStatusCache::Instance().Refresh();
 728                                 }
 729                                 break;
 730                         case TGITCACHECOMMAND_RELEASE:
 731                                 {
 732                                         CTGitPath changedpath;
 733                                         changedpath.SetFromWin(command.path, true);
 734                                         ATLTRACE(_T("release handle for path %s\n"), changedpath.GetWinPath());
 735                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 736                                         CGitStatusCache::Instance().CloseWatcherHandles(changedpath);
 737                                         CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 738                                 }
 739                                 break;
 740                         case TGITCACHECOMMAND_BLOCK:
 741                                 {
 742                                         CTGitPath changedpath;
 743                                         changedpath.SetFromWin(command.path);
 744                                         ATLTRACE(_T("block path %s\n"), changedpath.GetWinPath());
 745                                         CGitStatusCache::Instance().BlockPath(changedpath);
 746                                 }
 747                                 break;
 748                         case TGITCACHECOMMAND_UNBLOCK:
 749                                 {
 750                                         CTGitPath changedpath;
 751                                         changedpath.SetFromWin(command.path);
 752                                         ATLTRACE(_T("block path %s\n"), changedpath.GetWinPath());
 753                                         CGitStatusCache::Instance().UnBlockPath(changedpath);
 754                                 }
 755                                 break;
 756                 }
 757         }
 758
 759         // Flush the pipe to allow the client to read the pipe's contents
 760         // before disconnecting. Then disconnect the pipe, and close the
 761         // handle to this pipe instance.
 762
 763         FlushFileBuffers(hPipe);
 764         DisconnectNamedPipe(hPipe);
 765         ATLTRACE("Command thread exited\n");
 766         return 0;
 767 }