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) 2008-2014 - 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 "SmartHandle.h"
  35 #include "DllVersion.h"
  36 #include "CreateProcessHelper.h"
  37
  38 #ifndef GET_X_LPARAM
  39 #define GET_X_LPARAM(lp)                        ((int)(short)LOWORD(lp))
  40 #endif
  41 #ifndef GET_Y_LPARAM
  42 #define GET_Y_LPARAM(lp)                        ((int)(short)HIWORD(lp))
  43 #endif
  44
  45
  46 #pragma comment(linker, "\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
  47
  48 #if ENABLE_CRASHHANLDER
  49 CCrashReportTGit crasher(L"TGitCache " _T(APP_X64_STRING), TGIT_VERMAJOR, TGIT_VERMINOR, TGIT_VERMICRO, TGIT_VERBUILD, TGIT_VERDATE);
  50 #endif
  51
  52 DWORD WINAPI            InstanceThread(LPVOID);
  53 DWORD WINAPI            PipeThread(LPVOID);
  54 DWORD WINAPI            CommandWaitThread(LPVOID);
  55 DWORD WINAPI            CommandThread(LPVOID);
  56 LRESULT CALLBACK        WndProc(HWND, UINT, WPARAM, LPARAM);
  57 bool                            bRun = true;
  58 bool                            bRestart = false;
  59 NOTIFYICONDATA          niData;
  60 HWND                            hWnd;
  61 HWND                            hTrayWnd;
  62 TCHAR                           szCurrentCrawledPath[MAX_CRAWLEDPATHS][MAX_CRAWLEDPATHSLEN];
  63 int                                     nCurrentCrawledpathIndex = 0;
  64 CComAutoCriticalSection critSec;
  65
  66 volatile LONG           nThreadCount = 0;
  67
  68 #define PACKVERSION(major,minor) MAKELONG(minor,major)
  69
  70 void DebugOutputLastError()
  71 {
  72         LPVOID lpMsgBuf;
  73         if (!FormatMessage(
  74                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
  75                 FORMAT_MESSAGE_FROM_SYSTEM |
  76                 FORMAT_MESSAGE_IGNORE_INSERTS,
  77                 NULL,
  78                 GetLastError(),
  79                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
  80                 (LPTSTR) &lpMsgBuf,
  81                 0,
  82                 NULL ))
  83         {
  84                 return;
  85         }
  86
  87         // Display the string.
  88         OutputDebugStringA("TGitCache GetLastError(): ");
  89         OutputDebugString((LPCTSTR)lpMsgBuf);
  90         OutputDebugStringA("\n");
  91
  92         // Free the buffer.
  93         LocalFree( lpMsgBuf );
  94 }
  95
  96 void HandleCommandLine(LPSTR lpCmdLine)
  97 {
  98         char *ptr = strstr(lpCmdLine, "/kill:");
  99         if (ptr)
 100         {
 101                 DWORD pid = (DWORD)atoi(ptr + strlen("/kill:"));
 102                 HANDLE hProcess = ::OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 103                 if (hProcess)
 104                 {
 105                         if (::WaitForSingleObject(hProcess, 5000) != WAIT_OBJECT_0)
 106                         {
 107                                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Killing previous TGitCache PID %d\n", pid);
 108                                 if (!::TerminateProcess(hProcess, (UINT)-1))
 109                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Kill previous TGitCache PID %d failed\n", pid);
 110                                 ::WaitForSingleObject(hProcess, 5000);
 111                         }
 112                         ::CloseHandle(hProcess);
 113                         for (int i = 0; i < 5; i++)
 114                         {
 115                                 HANDLE hMutex = ::OpenMutex(MUTEX_ALL_ACCESS, FALSE, GetCacheMutexName());
 116                                 if (!hMutex)
 117                                         break;
 118                                 ::CloseHandle(hMutex);
 119                                 ::Sleep(1000);
 120                         }
 121                 }
 122         }
 123 }
 124
 125 void HandleRestart()
 126 {
 127         if (bRestart)
 128         {
 129                 TCHAR exeName[MAX_PATH] = { 0 };
 130                 ::GetModuleFileName(nullptr, exeName, _countof(exeName));
 131                 TCHAR cmdLine[20] = { 0 };
 132                 _stprintf_s(cmdLine, _T(" /kill:%d"), GetCurrentProcessId());
 133                 if (!CCreateProcessHelper::CreateProcessDetached(exeName, cmdLine))
 134                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Failed to start cache\n");
 135         }
 136 }
 137
 138 int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/, LPSTR lpCmdLine, int /*cmdShow*/)
 139 {
 140         SetDllDirectory(L"");
 141         HandleCommandLine(lpCmdLine);
 142         CAutoGeneralHandle hReloadProtection = ::CreateMutex(NULL, FALSE, GetCacheMutexName());
 143
 144         if ((!hReloadProtection) || (GetLastError() == ERROR_ALREADY_EXISTS))
 145         {
 146                 // An instance of TGitCache is already running
 147                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": TGitCache ignoring restart\n");
 148                 return 0;
 149         }
 150
 151         CGitStatusCache::Create();
 152         CGitStatusCache::Instance().Init();
 153
 154         SecureZeroMemory(szCurrentCrawledPath, sizeof(szCurrentCrawledPath));
 155
 156         DWORD dwThreadId;
 157         MSG msg;
 158         TCHAR szWindowClass[] = {TGIT_CACHE_WINDOW_NAME};
 159
 160         // create a hidden window to receive window messages.
 161         WNDCLASSEX wcex;
 162         wcex.cbSize = sizeof(WNDCLASSEX);
 163         wcex.style                      = CS_HREDRAW | CS_VREDRAW;
 164         wcex.lpfnWndProc        = (WNDPROC)WndProc;
 165         wcex.cbClsExtra         = 0;
 166         wcex.cbWndExtra         = 0;
 167         wcex.hInstance          = hInstance;
 168         wcex.hIcon                      = 0;
 169         wcex.hCursor            = 0;
 170         wcex.hbrBackground      = 0;
 171         wcex.lpszMenuName       = NULL;
 172         wcex.lpszClassName      = szWindowClass;
 173         wcex.hIconSm            = 0;
 174         RegisterClassEx(&wcex);
 175         hWnd = CreateWindow(TGIT_CACHE_WINDOW_NAME, TGIT_CACHE_WINDOW_NAME, WS_CAPTION, 0, 0, 800, 300, NULL, 0, hInstance, 0);
 176         hTrayWnd = hWnd;
 177         if (hWnd == NULL)
 178         {
 179                 return 0;
 180         }
 181         if (CRegStdDWORD(_T("Software\\TortoiseGit\\CacheTrayIcon"), FALSE)==TRUE)
 182         {
 183                 SecureZeroMemory(&niData,sizeof(NOTIFYICONDATA));
 184
 185                 DWORD dwMajor = 0;
 186                 DWORD dwMinor = 0;
 187                 GetShellVersion(&dwMajor, &dwMinor);
 188                 DWORD dwVersion = PACKVERSION(dwMajor, dwMinor);
 189                 if (dwVersion >= PACKVERSION(6,0))
 190                         niData.cbSize = sizeof(NOTIFYICONDATA);
 191                 else if (dwVersion >= PACKVERSION(5,0))
 192                         niData.cbSize = NOTIFYICONDATA_V2_SIZE;
 193                 else
 194                         niData.cbSize = NOTIFYICONDATA_V1_SIZE;
 195
 196                 niData.uID = TRAY_ID;           // own tray icon ID
 197                 niData.hWnd      = hWnd;
 198                 niData.uFlags = NIF_ICON|NIF_MESSAGE;
 199
 200                 // load the icon
 201                 niData.hIcon =
 202                         (HICON)LoadImage(hInstance,
 203                         MAKEINTRESOURCE(IDI_TGITCACHE),
 204                         IMAGE_ICON,
 205                         GetSystemMetrics(SM_CXSMICON),
 206                         GetSystemMetrics(SM_CYSMICON),
 207                         LR_DEFAULTCOLOR);
 208
 209                 // set the message to send
 210                 // note: the message value should be in the
 211                 // range of WM_APP through 0xBFFF
 212                 niData.uCallbackMessage = TRAY_CALLBACK;
 213                 Shell_NotifyIcon(NIM_ADD,&niData);
 214                 // free icon handle
 215                 if(niData.hIcon && DestroyIcon(niData.hIcon))
 216                         niData.hIcon = NULL;
 217         }
 218
 219         // Create a thread which waits for incoming pipe connections
 220         CAutoGeneralHandle hPipeThread = CreateThread(
 221                 NULL,              // no security attribute
 222                 0,                 // default stack size
 223                 PipeThread,
 224                 (LPVOID) &bRun,    // thread parameter
 225                 0,                 // not suspended
 226                 &dwThreadId);      // returns thread ID
 227
 228         if (!hPipeThread)
 229         {
 230                 return 0;
 231         }
 232         else hPipeThread.CloseHandle();
 233
 234         // Create a thread which waits for incoming pipe connections
 235         CAutoGeneralHandle hCommandWaitThread = CreateThread(
 236                 NULL,              // no security attribute
 237                 0,                 // default stack size
 238                 CommandWaitThread,
 239                 (LPVOID) &bRun,    // thread parameter
 240                 0,                 // not suspended
 241                 &dwThreadId);      // returns thread ID
 242
 243         if (!hCommandWaitThread)
 244         {
 245                 return 0;
 246         }
 247
 248
 249         // loop to handle window messages.
 250         while (bRun)
 251         {
 252                 BOOL bLoopRet = GetMessage(&msg, NULL, 0, 0);
 253                 if ((bLoopRet != -1)&&(bLoopRet != 0))
 254                 {
 255                         DispatchMessage(&msg);
 256                 }
 257         }
 258
 259         bRun = false;
 260
 261         Shell_NotifyIcon(NIM_DELETE,&niData);
 262         CGitStatusCache::Destroy();
 263         HandleRestart();
 264
 265         return 0;
 266 }
 267
 268 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 269 {
 270         switch (message)
 271         {
 272         case TRAY_CALLBACK:
 273         {
 274                 switch(lParam)
 275                 {
 276                 case WM_LBUTTONDBLCLK:
 277                         if (IsWindowVisible(hWnd))
 278                                 ShowWindow(hWnd, SW_HIDE);
 279                         else
 280                                 ShowWindow(hWnd, SW_RESTORE);
 281                         break;
 282                 case WM_MOUSEMOVE:
 283                         {
 284                                 CString sInfoTip;
 285                                 NOTIFYICONDATA SystemTray;
 286                                 sInfoTip.Format(_T("TortoiseGit Overlay Icon Server\nCached Directories: %Id\nWatched paths: %d"),
 287                                         CGitStatusCache::Instance().GetCacheSize(),
 288                                         CGitStatusCache::Instance().GetNumberOfWatchedPaths());
 289
 290                                 SystemTray.cbSize = sizeof(NOTIFYICONDATA);
 291                                 SystemTray.hWnd   = hTrayWnd;
 292                                 SystemTray.uID    = TRAY_ID;
 293                                 SystemTray.uFlags = NIF_TIP;
 294                                 _tcscpy_s(SystemTray.szTip, sInfoTip);
 295                                 Shell_NotifyIcon(NIM_MODIFY, &SystemTray);
 296                         }
 297                         break;
 298                 case WM_RBUTTONUP:
 299                 case WM_CONTEXTMENU:
 300                         {
 301                                 POINT pt;
 302                                 GetCursorPos(&pt);
 303                                 HMENU hMenu = CreatePopupMenu();
 304                                 if(hMenu)
 305                                 {
 306                                         bool enabled = (DWORD)CRegStdDWORD(_T("Software\\TortoiseGit\\CacheType"), GetSystemMetrics(SM_REMOTESESSION) ? ShellCache::dll : ShellCache::exe) != ShellCache::none;
 307                                         InsertMenu(hMenu, (UINT)-1, MF_BYPOSITION, TRAYPOP_ENABLE, enabled ? _T("Disable Status Cache") : _T("Enable Status Cache"));
 308                                         InsertMenu(hMenu, (UINT)-1, MF_BYPOSITION, TRAYPOP_EXIT, _T("Exit"));
 309                                         SetForegroundWindow(hWnd);
 310                                         TrackPopupMenu(hMenu, TPM_BOTTOMALIGN, pt.x, pt.y, 0, hWnd, NULL);
 311                                         DestroyMenu(hMenu);
 312                                 }
 313                         }
 314                         break;
 315                 }
 316         }
 317         break;
 318         case WM_PAINT:
 319                 {
 320                         PAINTSTRUCT ps;
 321                         HDC hdc = BeginPaint(hWnd, &ps);
 322                         RECT rect;
 323                         GetClientRect(hWnd, &rect);
 324                         // clear the background
 325                         HBRUSH background = CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
 326                         HGDIOBJ oldbrush = SelectObject(hdc, background);
 327                         FillRect(hdc, &rect, background);
 328
 329                         int line = 0;
 330                         SIZE fontsize = {0};
 331                         AutoLocker print(critSec);
 332                         GetTextExtentPoint32( hdc, szCurrentCrawledPath[0], (int)_tcslen(szCurrentCrawledPath[0]), &fontsize );
 333                         for (int i=nCurrentCrawledpathIndex; i<MAX_CRAWLEDPATHS; ++i)
 334                         {
 335                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 336                                 ++line;
 337                         }
 338                         for (int i=0; i<nCurrentCrawledpathIndex; ++i)
 339                         {
 340                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 341                                 ++line;
 342                         }
 343
 344                         SelectObject(hdc,oldbrush);
 345                         EndPaint(hWnd, &ps);
 346                         DeleteObject(background);
 347                         return 0L;
 348                 }
 349                 break;
 350         case WM_COMMAND:
 351                 {
 352                         WORD wmId    = LOWORD(wParam);
 353
 354                         switch (wmId)
 355                         {
 356                         case TRAYPOP_ENABLE:
 357                                 {
 358                                         CRegStdDWORD reg = CRegStdDWORD(_T("Software\\TortoiseGit\\CacheType"), GetSystemMetrics(SM_REMOTESESSION) ? ShellCache::dll : ShellCache::exe);
 359                                         bool enabled = (DWORD)reg != ShellCache::none;
 360                                         reg = enabled ? ShellCache::none : ShellCache::exe;
 361                                         if (enabled)
 362                                         {
 363                                                 bRestart = true;
 364                                                 DestroyWindow(hWnd);
 365                                         }
 366                                         break;
 367                                 }
 368                         case TRAYPOP_EXIT:
 369                                 DestroyWindow(hWnd);
 370                                 break;
 371                         }
 372                         return 1;
 373                 }
 374         case WM_QUERYENDSESSION:
 375                 {
 376                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_QUERYENDSESSION\n");
 377                         CAutoWriteWeakLock writeLock(CGitStatusCache::Instance().GetGuard(), 200);
 378                         CGitStatusCache::Instance().Stop();
 379                         return TRUE;
 380                 }
 381                 break;
 382         case WM_CLOSE:
 383         case WM_ENDSESSION:
 384         case WM_DESTROY:
 385         case WM_QUIT:
 386                 {
 387                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_CLOSE/DESTROY/ENDSESSION/QUIT\n");
 388                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 389                         CGitStatusCache::Instance().Stop();
 390                         CGitStatusCache::Instance().SaveCache();
 391                         if (message != WM_QUIT)
 392                                 PostQuitMessage(0);
 393                         bRun = false;
 394                         return 1;
 395                 }
 396                 break;
 397         case WM_DEVICECHANGE:
 398                 {
 399                         DEV_BROADCAST_HDR * phdr = (DEV_BROADCAST_HDR*)lParam;
 400                         switch (wParam)
 401                         {
 402                         case DBT_CUSTOMEVENT:
 403                                 {
 404                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_DEVICECHANGE with DBT_CUSTOMEVENT\n");
 405                                         if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 406                                         {
 407                                                 DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 408                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_DISMOUNT))
 409                                                 {
 410                                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Device to be dismounted\n");
 411                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 412                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 413                                                 }
 414                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_LOCK))
 415                                                 {
 416                                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Device lock event\n");
 417                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 418                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 419                                                 }
 420                                         }
 421                                 }
 422                                 break;
 423                         case DBT_DEVICEREMOVEPENDING:
 424                         case DBT_DEVICEQUERYREMOVE:
 425                         case DBT_DEVICEREMOVECOMPLETE:
 426                                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_DEVICECHANGE with DBT_DEVICEREMOVEPENDING/DBT_DEVICEQUERYREMOVE/DBT_DEVICEREMOVECOMPLETE\n");
 427                                 if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 428                                 {
 429                                         DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 430                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 431                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 432                                 }
 433                                 else if (phdr->dbch_devicetype == DBT_DEVTYP_VOLUME)
 434                                 {
 435                                         DEV_BROADCAST_VOLUME * pVolume = (DEV_BROADCAST_VOLUME*)lParam;
 436                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 437                                         for (BYTE i = 0; i < 26; ++i)
 438                                         {
 439                                                 if (pVolume->dbcv_unitmask & (1 << i))
 440                                                 {
 441                                                         TCHAR driveletter = 'A' + i;
 442                                                         CString drive = CString(driveletter);
 443                                                         drive += L":\\";
 444                                                         CGitStatusCache::Instance().CloseWatcherHandles(CTGitPath(drive));
 445                                                 }
 446                                         }
 447                                 }
 448                                 else
 449                                 {
 450                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 451                                         CGitStatusCache::Instance().CloseWatcherHandles(INVALID_HANDLE_VALUE);
 452                                 }
 453                                 break;
 454                         }
 455                 }
 456                 break;
 457         default:
 458                 break;
 459         }
 460         return DefWindowProc(hWnd, message, wParam, lParam);
 461 }
 462
 463 //////////////////////////////////////////////////////////////////////////
 464
 465 VOID GetAnswerToRequest(const TGITCacheRequest* pRequest, TGITCacheResponse* pReply, DWORD* pResponseLength)
 466 {
 467         CTGitPath path;
 468         *pResponseLength = 0;
 469         if(pRequest->flags & TGITCACHE_FLAGS_FOLDERISKNOWN)
 470         {
 471                 path.SetFromWin(pRequest->path, !!(pRequest->flags & TGITCACHE_FLAGS_ISFOLDER));
 472         }
 473         else
 474         {
 475                 path.SetFromWin(pRequest->path);
 476         }
 477
 478         CAutoReadWeakLock readLock(CGitStatusCache::Instance().GetGuard(), 2000);
 479         if (readLock.IsAcquired())
 480         {
 481                 CGitStatusCache::Instance().GetStatusForPath(path, pRequest->flags, false).BuildCacheResponse(*pReply, *pResponseLength);
 482         }
 483         else
 484         {
 485                 CStatusCacheEntry entry;
 486                 entry.BuildCacheResponse(*pReply, *pResponseLength);
 487         }
 488 }
 489
 490 DWORD WINAPI PipeThread(LPVOID lpvParam)
 491 {
 492         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": PipeThread started\n");
 493         bool * bRun = (bool *)lpvParam;
 494         // The main loop creates an instance of the named pipe and
 495         // then waits for a client to connect to it. When the client
 496         // connects, a thread is created to handle communications
 497         // with that client, and the loop is repeated.
 498         DWORD dwThreadId;
 499         BOOL fConnected;
 500         CAutoFile hPipe;
 501
 502         while (*bRun)
 503         {
 504                 hPipe = CreateNamedPipe(
 505                         GetCachePipeName(),
 506                         PIPE_ACCESS_DUPLEX,       // read/write access
 507                         PIPE_TYPE_MESSAGE |       // message type pipe
 508                         PIPE_READMODE_MESSAGE |   // message-read mode
 509                         PIPE_WAIT,                // blocking mode
 510                         PIPE_UNLIMITED_INSTANCES, // max. instances
 511                         BUFSIZE,                  // output buffer size
 512                         BUFSIZE,                  // input buffer size
 513                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 514                         NULL);                                    // NULL DACL
 515
 516                 if (!hPipe)
 517                 {
 518                         if (*bRun)
 519                                 Sleep(200);
 520                         continue; // never leave the thread!
 521                 }
 522
 523                 // Wait for the client to connect; if it succeeds,
 524                 // the function returns a nonzero value. If the function returns
 525                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 526                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 527                 if (fConnected)
 528                 {
 529                         // Create a thread for this client.
 530                         CAutoGeneralHandle hInstanceThread = CreateThread(
 531                                 NULL,              // no security attribute
 532                                 0,                 // default stack size
 533                                 InstanceThread,
 534                                 (HANDLE) hPipe,    // thread parameter
 535                                 0,                 // not suspended
 536                                 &dwThreadId);      // returns thread ID
 537
 538                         if (!hInstanceThread)
 539                         {
 540                                 DisconnectNamedPipe(hPipe);
 541                                 // since we're now closing this thread, we also have to close the whole application!
 542                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 543                                 // but no pipe will be available anymore.
 544                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 545                                 return 1;
 546                         }
 547                         // detach the handle, since we passed it to the thread
 548                         hPipe.Detach();
 549                 }
 550                 else
 551                 {
 552                         // The client could not connect, so close the pipe.
 553                         hPipe.CloseHandle();
 554                         if (*bRun)
 555                                 Sleep(200);
 556                         continue;       // don't end the thread!
 557                 }
 558         }
 559         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Pipe thread exited\n");
 560         return 0;
 561 }
 562
 563 DWORD WINAPI CommandWaitThread(LPVOID lpvParam)
 564 {
 565         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandWaitThread started\n");
 566         bool * bRun = (bool *)lpvParam;
 567         // The main loop creates an instance of the named pipe and
 568         // then waits for a client to connect to it. When the client
 569         // connects, a thread is created to handle communications
 570         // with that client, and the loop is repeated.
 571         DWORD dwThreadId;
 572         BOOL fConnected;
 573         CAutoFile hPipe;
 574
 575         while (*bRun)
 576         {
 577                 hPipe = CreateNamedPipe(
 578                         GetCacheCommandPipeName(),
 579                         PIPE_ACCESS_DUPLEX,       // read/write access
 580                         PIPE_TYPE_MESSAGE |       // message type pipe
 581                         PIPE_READMODE_MESSAGE |   // message-read mode
 582                         PIPE_WAIT,                // blocking mode
 583                         PIPE_UNLIMITED_INSTANCES, // max. instances
 584                         BUFSIZE,                  // output buffer size
 585                         BUFSIZE,                  // input buffer size
 586                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 587                         NULL);                // NULL DACL
 588
 589                 if (!hPipe)
 590                 {
 591                         if (*bRun)
 592                                 Sleep(200);
 593                         continue; // never leave the thread!
 594                 }
 595
 596                 // Wait for the client to connect; if it succeeds,
 597                 // the function returns a nonzero value. If the function returns
 598                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 599                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 600                 if (fConnected)
 601                 {
 602                         // Create a thread for this client.
 603                         CAutoGeneralHandle hCommandThread = CreateThread(
 604                                 NULL,              // no security attribute
 605                                 0,                 // default stack size
 606                                 CommandThread,
 607                                 (HANDLE) hPipe,    // thread parameter
 608                                 0,                 // not suspended
 609                                 &dwThreadId);      // returns thread ID
 610
 611                         if (!hCommandThread)
 612                         {
 613                                 DisconnectNamedPipe(hPipe);
 614                                 hPipe.CloseHandle();
 615                                 // since we're now closing this thread, we also have to close the whole application!
 616                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 617                                 // but no pipe will be available anymore.
 618                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 619                                 return 1;
 620                         }
 621                         // detach the handle, since we passed it to the thread
 622                         hPipe.Detach();
 623                 }
 624                 else
 625                 {
 626                         // The client could not connect, so close the pipe.
 627                         hPipe.CloseHandle();
 628                         if (*bRun)
 629                                 Sleep(200);
 630                         continue;       // don't end the thread!
 631                 }
 632         }
 633         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandWait thread exited\n");
 634         return 0;
 635 }
 636
 637 DWORD WINAPI InstanceThread(LPVOID lpvParam)
 638 {
 639         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": InstanceThread started\n");
 640         TGITCacheResponse response;
 641         DWORD cbBytesRead, cbWritten;
 642         CAutoFile hPipe;
 643
 644         // The thread's parameter is a handle to a pipe instance.
 645
 646         hPipe = lpvParam;
 647         InterlockedIncrement(&nThreadCount);
 648         while (bRun)
 649         {
 650                 // Read client requests from the pipe.
 651                 TGITCacheRequest request;
 652                 BOOL fSuccess = ReadFile(
 653                         hPipe,        // handle to pipe
 654                         &request,    // buffer to receive data
 655                         sizeof(request), // size of buffer
 656                         &cbBytesRead, // number of bytes read
 657                         NULL);        // not overlapped I/O
 658
 659                 if (! fSuccess || cbBytesRead == 0)
 660                 {
 661                         DisconnectNamedPipe(hPipe);
 662                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 663                         InterlockedDecrement(&nThreadCount);
 664                         if (nThreadCount == 0)
 665                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 666                         return 1;
 667                 }
 668
 669                 DWORD responseLength;
 670                 GetAnswerToRequest(&request, &response, &responseLength);
 671
 672                 // Write the reply to the pipe.
 673                 fSuccess = WriteFile(
 674                         hPipe,        // handle to pipe
 675                         &response,      // buffer to write from
 676                         responseLength, // number of bytes to write
 677                         &cbWritten,   // number of bytes written
 678                         NULL);        // not overlapped I/O
 679
 680                 if (! fSuccess || responseLength != cbWritten)
 681                 {
 682                         DisconnectNamedPipe(hPipe);
 683                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 684                         InterlockedDecrement(&nThreadCount);
 685                         if (nThreadCount == 0)
 686                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 687                         return 1;
 688                 }
 689         }
 690
 691         // Flush the pipe to allow the client to read the pipe's contents
 692         // before disconnecting. Then disconnect the pipe, and close the
 693         // handle to this pipe instance.
 694
 695         FlushFileBuffers(hPipe);
 696         DisconnectNamedPipe(hPipe);
 697         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 698         InterlockedDecrement(&nThreadCount);
 699         if (nThreadCount == 0)
 700                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 701         return 0;
 702 }
 703
 704 DWORD WINAPI CommandThread(LPVOID lpvParam)
 705 {
 706         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandThread started\n");
 707         DWORD cbBytesRead;
 708         CAutoFile hPipe;
 709
 710         // The thread's parameter is a handle to a pipe instance.
 711
 712         hPipe = lpvParam;
 713
 714         while (bRun)
 715         {
 716                 // Read client requests from the pipe.
 717                 TGITCacheCommand command;
 718                 BOOL fSuccess = ReadFile(
 719                         hPipe,                          // handle to pipe
 720                         &command,                       // buffer to receive data
 721                         sizeof(command),        // size of buffer
 722                         &cbBytesRead,           // number of bytes read
 723                         NULL);                          // not overlapped I/O
 724
 725                 if (! fSuccess || cbBytesRead == 0)
 726                 {
 727                         DisconnectNamedPipe(hPipe);
 728                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 729                         return 1;
 730                 }
 731
 732                 switch (command.command)
 733                 {
 734                         case TGITCACHECOMMAND_END:
 735                                 FlushFileBuffers(hPipe);
 736                                 DisconnectNamedPipe(hPipe);
 737                                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 738                                 return 0;
 739                         case TGITCACHECOMMAND_CRAWL:
 740                                 {
 741                                         CTGitPath changedpath;
 742                                         changedpath.SetFromWin(command.path, true);
 743                                         // remove the path from our cache - that will 'invalidate' it.
 744                                         {
 745                                                 CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 746                                                 CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 747                                         }
 748                                         CGitStatusCache::Instance().AddFolderForCrawling(changedpath.GetDirectory());
 749                                 }
 750                                 break;
 751                         case TGITCACHECOMMAND_REFRESHALL:
 752                                 {
 753                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 754                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": refresh all\n"));
 755                                         CGitStatusCache::Instance().Refresh();
 756                                 }
 757                                 break;
 758                         case TGITCACHECOMMAND_RELEASE:
 759                                 {
 760                                         CTGitPath changedpath;
 761                                         changedpath.SetFromWin(command.path, true);
 762                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": release handle for path %s\n"), changedpath.GetWinPath());
 763                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 764                                         CGitStatusCache::Instance().CloseWatcherHandles(changedpath);
 765                                         CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 766                                 }
 767                                 break;
 768                         case TGITCACHECOMMAND_BLOCK:
 769                                 {
 770                                         CTGitPath changedpath;
 771                                         changedpath.SetFromWin(command.path);
 772                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": block path %s\n"), changedpath.GetWinPath());
 773                                         CGitStatusCache::Instance().BlockPath(changedpath);
 774                                 }
 775                                 break;
 776                         case TGITCACHECOMMAND_UNBLOCK:
 777                                 {
 778                                         CTGitPath changedpath;
 779                                         changedpath.SetFromWin(command.path);
 780                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": unblock path %s\n"), changedpath.GetWinPath());
 781                                         CGitStatusCache::Instance().UnBlockPath(changedpath);
 782                                 }
 783                                 break;
 784                 }
 785         }
 786
 787         // Flush the pipe to allow the client to read the pipe's contents
 788         // before disconnecting. Then disconnect the pipe, and close the
 789         // handle to this pipe instance.
 790
 791         FlushFileBuffers(hPipe);
 792         DisconnectNamedPipe(hPipe);
 793         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 794         return 0;
 795 }