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         git_threads_init();
 142         HandleCommandLine(lpCmdLine);
 143         CAutoGeneralHandle hReloadProtection = ::CreateMutex(NULL, FALSE, GetCacheMutexName());
 144
 145         if ((!hReloadProtection) || (GetLastError() == ERROR_ALREADY_EXISTS))
 146         {
 147                 // An instance of TGitCache is already running
 148                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": TGitCache ignoring restart\n");
 149                 return 0;
 150         }
 151
 152         CGitStatusCache::Create();
 153         CGitStatusCache::Instance().Init();
 154
 155         SecureZeroMemory(szCurrentCrawledPath, sizeof(szCurrentCrawledPath));
 156
 157         DWORD dwThreadId;
 158         MSG msg;
 159         TCHAR szWindowClass[] = {TGIT_CACHE_WINDOW_NAME};
 160
 161         // create a hidden window to receive window messages.
 162         WNDCLASSEX wcex;
 163         wcex.cbSize = sizeof(WNDCLASSEX);
 164         wcex.style                      = CS_HREDRAW | CS_VREDRAW;
 165         wcex.lpfnWndProc        = (WNDPROC)WndProc;
 166         wcex.cbClsExtra         = 0;
 167         wcex.cbWndExtra         = 0;
 168         wcex.hInstance          = hInstance;
 169         wcex.hIcon                      = 0;
 170         wcex.hCursor            = 0;
 171         wcex.hbrBackground      = 0;
 172         wcex.lpszMenuName       = NULL;
 173         wcex.lpszClassName      = szWindowClass;
 174         wcex.hIconSm            = 0;
 175         RegisterClassEx(&wcex);
 176         hWnd = CreateWindow(TGIT_CACHE_WINDOW_NAME, TGIT_CACHE_WINDOW_NAME, WS_CAPTION, 0, 0, 800, 300, NULL, 0, hInstance, 0);
 177         hTrayWnd = hWnd;
 178         if (hWnd == NULL)
 179         {
 180                 return 0;
 181         }
 182         if (CRegStdDWORD(_T("Software\\TortoiseGit\\CacheTrayIcon"), FALSE)==TRUE)
 183         {
 184                 SecureZeroMemory(&niData,sizeof(NOTIFYICONDATA));
 185
 186                 DWORD dwMajor = 0;
 187                 DWORD dwMinor = 0;
 188                 GetShellVersion(&dwMajor, &dwMinor);
 189                 DWORD dwVersion = PACKVERSION(dwMajor, dwMinor);
 190                 if (dwVersion >= PACKVERSION(6,0))
 191                         niData.cbSize = sizeof(NOTIFYICONDATA);
 192                 else if (dwVersion >= PACKVERSION(5,0))
 193                         niData.cbSize = NOTIFYICONDATA_V2_SIZE;
 194                 else
 195                         niData.cbSize = NOTIFYICONDATA_V1_SIZE;
 196
 197                 niData.uID = TRAY_ID;           // own tray icon ID
 198                 niData.hWnd      = hWnd;
 199                 niData.uFlags = NIF_ICON|NIF_MESSAGE;
 200
 201                 // load the icon
 202                 niData.hIcon =
 203                         (HICON)LoadImage(hInstance,
 204                         MAKEINTRESOURCE(IDI_TGITCACHE),
 205                         IMAGE_ICON,
 206                         GetSystemMetrics(SM_CXSMICON),
 207                         GetSystemMetrics(SM_CYSMICON),
 208                         LR_DEFAULTCOLOR);
 209
 210                 // set the message to send
 211                 // note: the message value should be in the
 212                 // range of WM_APP through 0xBFFF
 213                 niData.uCallbackMessage = TRAY_CALLBACK;
 214                 Shell_NotifyIcon(NIM_ADD,&niData);
 215                 // free icon handle
 216                 if(niData.hIcon && DestroyIcon(niData.hIcon))
 217                         niData.hIcon = NULL;
 218         }
 219
 220         // Create a thread which waits for incoming pipe connections
 221         CAutoGeneralHandle hPipeThread = CreateThread(
 222                 NULL,              // no security attribute
 223                 0,                 // default stack size
 224                 PipeThread,
 225                 (LPVOID) &bRun,    // thread parameter
 226                 0,                 // not suspended
 227                 &dwThreadId);      // returns thread ID
 228
 229         if (!hPipeThread)
 230         {
 231                 return 0;
 232         }
 233         else hPipeThread.CloseHandle();
 234
 235         // Create a thread which waits for incoming pipe connections
 236         CAutoGeneralHandle hCommandWaitThread = CreateThread(
 237                 NULL,              // no security attribute
 238                 0,                 // default stack size
 239                 CommandWaitThread,
 240                 (LPVOID) &bRun,    // thread parameter
 241                 0,                 // not suspended
 242                 &dwThreadId);      // returns thread ID
 243
 244         if (!hCommandWaitThread)
 245         {
 246                 return 0;
 247         }
 248
 249
 250         // loop to handle window messages.
 251         while (bRun)
 252         {
 253                 BOOL bLoopRet = GetMessage(&msg, NULL, 0, 0);
 254                 if ((bLoopRet != -1)&&(bLoopRet != 0))
 255                 {
 256                         DispatchMessage(&msg);
 257                 }
 258         }
 259
 260         bRun = false;
 261
 262         Shell_NotifyIcon(NIM_DELETE,&niData);
 263         CGitStatusCache::Destroy();
 264         HandleRestart();
 265         git_threads_shutdown();
 266         return 0;
 267 }
 268
 269 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 270 {
 271         switch (message)
 272         {
 273         case TRAY_CALLBACK:
 274         {
 275                 switch(lParam)
 276                 {
 277                 case WM_LBUTTONDBLCLK:
 278                         if (IsWindowVisible(hWnd))
 279                                 ShowWindow(hWnd, SW_HIDE);
 280                         else
 281                                 ShowWindow(hWnd, SW_RESTORE);
 282                         break;
 283                 case WM_MOUSEMOVE:
 284                         {
 285                                 CString sInfoTip;
 286                                 NOTIFYICONDATA SystemTray;
 287                                 sInfoTip.Format(_T("TortoiseGit Overlay Icon Server\nCached Directories: %Id\nWatched paths: %d"),
 288                                         CGitStatusCache::Instance().GetCacheSize(),
 289                                         CGitStatusCache::Instance().GetNumberOfWatchedPaths());
 290
 291                                 SystemTray.cbSize = sizeof(NOTIFYICONDATA);
 292                                 SystemTray.hWnd   = hTrayWnd;
 293                                 SystemTray.uID    = TRAY_ID;
 294                                 SystemTray.uFlags = NIF_TIP;
 295                                 _tcscpy_s(SystemTray.szTip, sInfoTip);
 296                                 Shell_NotifyIcon(NIM_MODIFY, &SystemTray);
 297                         }
 298                         break;
 299                 case WM_RBUTTONUP:
 300                 case WM_CONTEXTMENU:
 301                         {
 302                                 POINT pt;
 303                                 GetCursorPos(&pt);
 304                                 HMENU hMenu = CreatePopupMenu();
 305                                 if(hMenu)
 306                                 {
 307                                         bool enabled = (DWORD)CRegStdDWORD(_T("Software\\TortoiseGit\\CacheType"), GetSystemMetrics(SM_REMOTESESSION) ? ShellCache::dll : ShellCache::exe) != ShellCache::none;
 308                                         InsertMenu(hMenu, (UINT)-1, MF_BYPOSITION, TRAYPOP_ENABLE, enabled ? _T("Disable Status Cache") : _T("Enable Status Cache"));
 309                                         InsertMenu(hMenu, (UINT)-1, MF_BYPOSITION, TRAYPOP_EXIT, _T("Exit"));
 310                                         SetForegroundWindow(hWnd);
 311                                         TrackPopupMenu(hMenu, TPM_BOTTOMALIGN, pt.x, pt.y, 0, hWnd, NULL);
 312                                         DestroyMenu(hMenu);
 313                                 }
 314                         }
 315                         break;
 316                 }
 317         }
 318         break;
 319         case WM_PAINT:
 320                 {
 321                         PAINTSTRUCT ps;
 322                         HDC hdc = BeginPaint(hWnd, &ps);
 323                         RECT rect;
 324                         GetClientRect(hWnd, &rect);
 325                         // clear the background
 326                         HBRUSH background = CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
 327                         HGDIOBJ oldbrush = SelectObject(hdc, background);
 328                         FillRect(hdc, &rect, background);
 329
 330                         int line = 0;
 331                         SIZE fontsize = {0};
 332                         AutoLocker print(critSec);
 333                         GetTextExtentPoint32( hdc, szCurrentCrawledPath[0], (int)_tcslen(szCurrentCrawledPath[0]), &fontsize );
 334                         for (int i=nCurrentCrawledpathIndex; i<MAX_CRAWLEDPATHS; ++i)
 335                         {
 336                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 337                                 ++line;
 338                         }
 339                         for (int i=0; i<nCurrentCrawledpathIndex; ++i)
 340                         {
 341                                 TextOut(hdc, 0, line*fontsize.cy, szCurrentCrawledPath[i], (int)_tcslen(szCurrentCrawledPath[i]));
 342                                 ++line;
 343                         }
 344
 345                         SelectObject(hdc,oldbrush);
 346                         EndPaint(hWnd, &ps);
 347                         DeleteObject(background);
 348                         return 0L;
 349                 }
 350                 break;
 351         case WM_COMMAND:
 352                 {
 353                         WORD wmId    = LOWORD(wParam);
 354
 355                         switch (wmId)
 356                         {
 357                         case TRAYPOP_ENABLE:
 358                                 {
 359                                         CRegStdDWORD reg = CRegStdDWORD(_T("Software\\TortoiseGit\\CacheType"), GetSystemMetrics(SM_REMOTESESSION) ? ShellCache::dll : ShellCache::exe);
 360                                         bool enabled = (DWORD)reg != ShellCache::none;
 361                                         reg = enabled ? ShellCache::none : ShellCache::exe;
 362                                         if (enabled)
 363                                         {
 364                                                 bRestart = true;
 365                                                 DestroyWindow(hWnd);
 366                                         }
 367                                         break;
 368                                 }
 369                         case TRAYPOP_EXIT:
 370                                 DestroyWindow(hWnd);
 371                                 break;
 372                         }
 373                         return 1;
 374                 }
 375         case WM_QUERYENDSESSION:
 376                 {
 377                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_QUERYENDSESSION\n");
 378                         CAutoWriteWeakLock writeLock(CGitStatusCache::Instance().GetGuard(), 200);
 379                         CGitStatusCache::Instance().Stop();
 380                         return TRUE;
 381                 }
 382                 break;
 383         case WM_CLOSE:
 384         case WM_ENDSESSION:
 385         case WM_DESTROY:
 386         case WM_QUIT:
 387                 {
 388                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_CLOSE/DESTROY/ENDSESSION/QUIT\n");
 389                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 390                         CGitStatusCache::Instance().Stop();
 391                         CGitStatusCache::Instance().SaveCache();
 392                         if (message != WM_QUIT)
 393                                 PostQuitMessage(0);
 394                         bRun = false;
 395                         return 1;
 396                 }
 397                 break;
 398         case WM_DEVICECHANGE:
 399                 {
 400                         DEV_BROADCAST_HDR * phdr = (DEV_BROADCAST_HDR*)lParam;
 401                         switch (wParam)
 402                         {
 403                         case DBT_CUSTOMEVENT:
 404                                 {
 405                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_DEVICECHANGE with DBT_CUSTOMEVENT\n");
 406                                         if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 407                                         {
 408                                                 DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 409                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_DISMOUNT))
 410                                                 {
 411                                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Device to be dismounted\n");
 412                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 413                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 414                                                 }
 415                                                 if (IsEqualGUID(phandle->dbch_eventguid, GUID_IO_VOLUME_LOCK))
 416                                                 {
 417                                                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Device lock event\n");
 418                                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 419                                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 420                                                 }
 421                                         }
 422                                 }
 423                                 break;
 424                         case DBT_DEVICEREMOVEPENDING:
 425                         case DBT_DEVICEQUERYREMOVE:
 426                         case DBT_DEVICEREMOVECOMPLETE:
 427                                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": WM_DEVICECHANGE with DBT_DEVICEREMOVEPENDING/DBT_DEVICEQUERYREMOVE/DBT_DEVICEREMOVECOMPLETE\n");
 428                                 if (phdr->dbch_devicetype == DBT_DEVTYP_HANDLE)
 429                                 {
 430                                         DEV_BROADCAST_HANDLE * phandle = (DEV_BROADCAST_HANDLE*)lParam;
 431                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 432                                         CGitStatusCache::Instance().CloseWatcherHandles(phandle->dbch_handle);
 433                                 }
 434                                 else if (phdr->dbch_devicetype == DBT_DEVTYP_VOLUME)
 435                                 {
 436                                         DEV_BROADCAST_VOLUME * pVolume = (DEV_BROADCAST_VOLUME*)lParam;
 437                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 438                                         for (BYTE i = 0; i < 26; ++i)
 439                                         {
 440                                                 if (pVolume->dbcv_unitmask & (1 << i))
 441                                                 {
 442                                                         TCHAR driveletter = 'A' + i;
 443                                                         CString drive = CString(driveletter);
 444                                                         drive += L":\\";
 445                                                         CGitStatusCache::Instance().CloseWatcherHandles(CTGitPath(drive));
 446                                                 }
 447                                         }
 448                                 }
 449                                 else
 450                                 {
 451                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 452                                         CGitStatusCache::Instance().CloseWatcherHandles(INVALID_HANDLE_VALUE);
 453                                 }
 454                                 break;
 455                         }
 456                 }
 457                 break;
 458         default:
 459                 break;
 460         }
 461         return DefWindowProc(hWnd, message, wParam, lParam);
 462 }
 463
 464 //////////////////////////////////////////////////////////////////////////
 465
 466 VOID GetAnswerToRequest(const TGITCacheRequest* pRequest, TGITCacheResponse* pReply, DWORD* pResponseLength)
 467 {
 468         CTGitPath path;
 469         *pResponseLength = 0;
 470         if(pRequest->flags & TGITCACHE_FLAGS_FOLDERISKNOWN)
 471         {
 472                 path.SetFromWin(pRequest->path, !!(pRequest->flags & TGITCACHE_FLAGS_ISFOLDER));
 473         }
 474         else
 475         {
 476                 path.SetFromWin(pRequest->path);
 477         }
 478
 479         CAutoReadWeakLock readLock(CGitStatusCache::Instance().GetGuard(), 2000);
 480         if (readLock.IsAcquired())
 481         {
 482                 CGitStatusCache::Instance().GetStatusForPath(path, pRequest->flags, false).BuildCacheResponse(*pReply, *pResponseLength);
 483         }
 484         else
 485         {
 486                 CStatusCacheEntry entry;
 487                 entry.BuildCacheResponse(*pReply, *pResponseLength);
 488         }
 489 }
 490
 491 DWORD WINAPI PipeThread(LPVOID lpvParam)
 492 {
 493         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": PipeThread started\n");
 494         bool * bRun = (bool *)lpvParam;
 495         // The main loop creates an instance of the named pipe and
 496         // then waits for a client to connect to it. When the client
 497         // connects, a thread is created to handle communications
 498         // with that client, and the loop is repeated.
 499         DWORD dwThreadId;
 500         BOOL fConnected;
 501         CAutoFile hPipe;
 502
 503         while (*bRun)
 504         {
 505                 hPipe = CreateNamedPipe(
 506                         GetCachePipeName(),
 507                         PIPE_ACCESS_DUPLEX,       // read/write access
 508                         PIPE_TYPE_MESSAGE |       // message type pipe
 509                         PIPE_READMODE_MESSAGE |   // message-read mode
 510                         PIPE_WAIT,                // blocking mode
 511                         PIPE_UNLIMITED_INSTANCES, // max. instances
 512                         BUFSIZE,                  // output buffer size
 513                         BUFSIZE,                  // input buffer size
 514                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 515                         NULL);                                    // NULL DACL
 516
 517                 if (!hPipe)
 518                 {
 519                         if (*bRun)
 520                                 Sleep(200);
 521                         continue; // never leave the thread!
 522                 }
 523
 524                 // Wait for the client to connect; if it succeeds,
 525                 // the function returns a nonzero value. If the function returns
 526                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 527                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 528                 if (fConnected)
 529                 {
 530                         // Create a thread for this client.
 531                         CAutoGeneralHandle hInstanceThread = CreateThread(
 532                                 NULL,              // no security attribute
 533                                 0,                 // default stack size
 534                                 InstanceThread,
 535                                 (HANDLE) hPipe,    // thread parameter
 536                                 0,                 // not suspended
 537                                 &dwThreadId);      // returns thread ID
 538
 539                         if (!hInstanceThread)
 540                         {
 541                                 DisconnectNamedPipe(hPipe);
 542                                 // since we're now closing this thread, we also have to close the whole application!
 543                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 544                                 // but no pipe will be available anymore.
 545                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 546                                 return 1;
 547                         }
 548                         // detach the handle, since we passed it to the thread
 549                         hPipe.Detach();
 550                 }
 551                 else
 552                 {
 553                         // The client could not connect, so close the pipe.
 554                         hPipe.CloseHandle();
 555                         if (*bRun)
 556                                 Sleep(200);
 557                         continue;       // don't end the thread!
 558                 }
 559         }
 560         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Pipe thread exited\n");
 561         return 0;
 562 }
 563
 564 DWORD WINAPI CommandWaitThread(LPVOID lpvParam)
 565 {
 566         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandWaitThread started\n");
 567         bool * bRun = (bool *)lpvParam;
 568         // The main loop creates an instance of the named pipe and
 569         // then waits for a client to connect to it. When the client
 570         // connects, a thread is created to handle communications
 571         // with that client, and the loop is repeated.
 572         DWORD dwThreadId;
 573         BOOL fConnected;
 574         CAutoFile hPipe;
 575
 576         while (*bRun)
 577         {
 578                 hPipe = CreateNamedPipe(
 579                         GetCacheCommandPipeName(),
 580                         PIPE_ACCESS_DUPLEX,       // read/write access
 581                         PIPE_TYPE_MESSAGE |       // message type pipe
 582                         PIPE_READMODE_MESSAGE |   // message-read mode
 583                         PIPE_WAIT,                // blocking mode
 584                         PIPE_UNLIMITED_INSTANCES, // max. instances
 585                         BUFSIZE,                  // output buffer size
 586                         BUFSIZE,                  // input buffer size
 587                         NMPWAIT_USE_DEFAULT_WAIT, // client time-out
 588                         NULL);                // NULL DACL
 589
 590                 if (!hPipe)
 591                 {
 592                         if (*bRun)
 593                                 Sleep(200);
 594                         continue; // never leave the thread!
 595                 }
 596
 597                 // Wait for the client to connect; if it succeeds,
 598                 // the function returns a nonzero value. If the function returns
 599                 // zero, GetLastError returns ERROR_PIPE_CONNECTED.
 600                 fConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 601                 if (fConnected)
 602                 {
 603                         // Create a thread for this client.
 604                         CAutoGeneralHandle hCommandThread = CreateThread(
 605                                 NULL,              // no security attribute
 606                                 0,                 // default stack size
 607                                 CommandThread,
 608                                 (HANDLE) hPipe,    // thread parameter
 609                                 0,                 // not suspended
 610                                 &dwThreadId);      // returns thread ID
 611
 612                         if (!hCommandThread)
 613                         {
 614                                 DisconnectNamedPipe(hPipe);
 615                                 hPipe.CloseHandle();
 616                                 // since we're now closing this thread, we also have to close the whole application!
 617                                 // otherwise the thread is dead, but the app is still running, refusing new instances
 618                                 // but no pipe will be available anymore.
 619                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 620                                 return 1;
 621                         }
 622                         // detach the handle, since we passed it to the thread
 623                         hPipe.Detach();
 624                 }
 625                 else
 626                 {
 627                         // The client could not connect, so close the pipe.
 628                         hPipe.CloseHandle();
 629                         if (*bRun)
 630                                 Sleep(200);
 631                         continue;       // don't end the thread!
 632                 }
 633         }
 634         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandWait thread exited\n");
 635         return 0;
 636 }
 637
 638 DWORD WINAPI InstanceThread(LPVOID lpvParam)
 639 {
 640         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": InstanceThread started\n");
 641         TGITCacheResponse response;
 642         DWORD cbBytesRead, cbWritten;
 643         CAutoFile hPipe;
 644
 645         // The thread's parameter is a handle to a pipe instance.
 646
 647         hPipe = lpvParam;
 648         InterlockedIncrement(&nThreadCount);
 649         while (bRun)
 650         {
 651                 // Read client requests from the pipe.
 652                 TGITCacheRequest request;
 653                 BOOL fSuccess = ReadFile(
 654                         hPipe,        // handle to pipe
 655                         &request,    // buffer to receive data
 656                         sizeof(request), // size of buffer
 657                         &cbBytesRead, // number of bytes read
 658                         NULL);        // not overlapped I/O
 659
 660                 if (! fSuccess || cbBytesRead == 0)
 661                 {
 662                         DisconnectNamedPipe(hPipe);
 663                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 664                         InterlockedDecrement(&nThreadCount);
 665                         if (nThreadCount == 0)
 666                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 667                         return 1;
 668                 }
 669
 670                 DWORD responseLength;
 671                 GetAnswerToRequest(&request, &response, &responseLength);
 672
 673                 // Write the reply to the pipe.
 674                 fSuccess = WriteFile(
 675                         hPipe,        // handle to pipe
 676                         &response,      // buffer to write from
 677                         responseLength, // number of bytes to write
 678                         &cbWritten,   // number of bytes written
 679                         NULL);        // not overlapped I/O
 680
 681                 if (! fSuccess || responseLength != cbWritten)
 682                 {
 683                         DisconnectNamedPipe(hPipe);
 684                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 685                         InterlockedDecrement(&nThreadCount);
 686                         if (nThreadCount == 0)
 687                                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 688                         return 1;
 689                 }
 690         }
 691
 692         // Flush the pipe to allow the client to read the pipe's contents
 693         // before disconnecting. Then disconnect the pipe, and close the
 694         // handle to this pipe instance.
 695
 696         FlushFileBuffers(hPipe);
 697         DisconnectNamedPipe(hPipe);
 698         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Instance thread exited\n");
 699         InterlockedDecrement(&nThreadCount);
 700         if (nThreadCount == 0)
 701                 PostMessage(hWnd, WM_CLOSE, 0, 0);
 702         return 0;
 703 }
 704
 705 DWORD WINAPI CommandThread(LPVOID lpvParam)
 706 {
 707         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": CommandThread started\n");
 708         DWORD cbBytesRead;
 709         CAutoFile hPipe;
 710
 711         // The thread's parameter is a handle to a pipe instance.
 712
 713         hPipe = lpvParam;
 714
 715         while (bRun)
 716         {
 717                 // Read client requests from the pipe.
 718                 TGITCacheCommand command;
 719                 BOOL fSuccess = ReadFile(
 720                         hPipe,                          // handle to pipe
 721                         &command,                       // buffer to receive data
 722                         sizeof(command),        // size of buffer
 723                         &cbBytesRead,           // number of bytes read
 724                         NULL);                          // not overlapped I/O
 725
 726                 if (! fSuccess || cbBytesRead == 0)
 727                 {
 728                         DisconnectNamedPipe(hPipe);
 729                         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 730                         return 1;
 731                 }
 732
 733                 switch (command.command)
 734                 {
 735                         case TGITCACHECOMMAND_END:
 736                                 FlushFileBuffers(hPipe);
 737                                 DisconnectNamedPipe(hPipe);
 738                                 CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 739                                 return 0;
 740                         case TGITCACHECOMMAND_CRAWL:
 741                                 {
 742                                         CTGitPath changedpath;
 743                                         changedpath.SetFromWin(command.path, true);
 744                                         // remove the path from our cache - that will 'invalidate' it.
 745                                         {
 746                                                 CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 747                                                 CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 748                                         }
 749                                         CGitStatusCache::Instance().AddFolderForCrawling(changedpath.GetDirectory());
 750                                 }
 751                                 break;
 752                         case TGITCACHECOMMAND_REFRESHALL:
 753                                 {
 754                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 755                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": refresh all\n"));
 756                                         CGitStatusCache::Instance().Refresh();
 757                                 }
 758                                 break;
 759                         case TGITCACHECOMMAND_RELEASE:
 760                                 {
 761                                         CTGitPath changedpath;
 762                                         changedpath.SetFromWin(command.path, true);
 763                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": release handle for path %s\n"), changedpath.GetWinPath());
 764                                         CAutoWriteLock writeLock(CGitStatusCache::Instance().GetGuard());
 765                                         CGitStatusCache::Instance().CloseWatcherHandles(changedpath);
 766                                         CGitStatusCache::Instance().RemoveCacheForPath(changedpath);
 767                                 }
 768                                 break;
 769                         case TGITCACHECOMMAND_BLOCK:
 770                                 {
 771                                         CTGitPath changedpath;
 772                                         changedpath.SetFromWin(command.path);
 773                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": block path %s\n"), changedpath.GetWinPath());
 774                                         CGitStatusCache::Instance().BlockPath(changedpath);
 775                                 }
 776                                 break;
 777                         case TGITCACHECOMMAND_UNBLOCK:
 778                                 {
 779                                         CTGitPath changedpath;
 780                                         changedpath.SetFromWin(command.path);
 781                                         CTraceToOutputDebugString::Instance()(_T(__FUNCTION__) _T(": unblock path %s\n"), changedpath.GetWinPath());
 782                                         CGitStatusCache::Instance().UnBlockPath(changedpath);
 783                                 }
 784                                 break;
 785                 }
 786         }
 787
 788         // Flush the pipe to allow the client to read the pipe's contents
 789         // before disconnecting. Then disconnect the pipe, and close the
 790         // handle to this pipe instance.
 791
 792         FlushFileBuffers(hPipe);
 793         DisconnectNamedPipe(hPipe);
 794         CTraceToOutputDebugString::Instance()(__FUNCTION__ ": Command thread exited\n");
 795         return 0;
 796 }