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437 lines
11 KiB
437 lines
11 KiB
//=======================================================================
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//
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// Copyright (c) 1998-2001 Microsoft Corporation. All Rights Reserved.
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//
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// File: FreeLog.cpp
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//
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// Owner: KenSh
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//
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// Description:
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//
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// Runtime logging for use in both checked and free builds.
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//
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//=======================================================================
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#include <windows.h>
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#include <tchar.h>
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#include <stdio.h>
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#include <malloc.h>
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#include "FreeLog.h"
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#include <MISTSAFE.h>
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#ifndef _countof
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#define _countof(ar) (sizeof(ar)/sizeof((ar)[0]))
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#endif
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// Unicode files start with the 2 bytes { FF FE }.
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// This is the little-endian version of those 2 bytes.
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#define UNICODE_FILE_HEADER 0xFEFF
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#define MUTEX_TIMEOUT 1000 // Don't wait more than 1 second to write to logfile
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#define MAX_MUTEX_WAITS 4 // Don't keep trying after this many failures
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#define LOG_FILE_BIG_SIZE 50000 // Don't bother trimming if file is smaller than this
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#define LOG_LINES_TRIM_FROM 1000 // Start trimming if more than this many lines
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#define LOG_LINES_TRIM_TO 750 // Trim til the log file is this many lines
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#define LOG_LEVEL_SUCCESS 0
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#define LOG_LEVEL_FAILURE 1
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#define MAX_MSG_LENGTH (MAX_PATH + 20)
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#define MAX_ERROR_LENGTH 128
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static const TCHAR c_szUnknownModuleName[] = _T("?");
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// Local functions
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void LogMessageExV(UINT nLevel, DWORD dwError, LPCSTR pszFormatA, va_list args);
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//============================================================================
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//
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// Private CFreeLogging class to keep track of log file resources
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//
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//============================================================================
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class CFreeLogging
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{
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public:
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CFreeLogging(LPCTSTR pszModuleName, LPCTSTR pszLogFileName);
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~CFreeLogging();
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void WriteLine(LPCTSTR pszText, UINT nLevel, DWORD dwError);
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private:
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inline static HANDLE CreateMutex(LPCTSTR pszMutexName);
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inline HANDLE OpenLogFile(LPCTSTR pszFileName);
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inline void CloseLogFile();
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void TrimLogFile();
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BOOL AcquireMutex();
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void ReleaseMutex();
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private:
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HANDLE m_hFile;
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HANDLE m_hMutex;
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int m_cLinesWritten;
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int m_cFailedWaits;
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LPTSTR m_pszModuleName;
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};
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CFreeLogging* g_pFreeLogging;
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//============================================================================
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//
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// Public functions
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//
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//============================================================================
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void InitFreeLogging(LPCTSTR pszModuleName, LPCTSTR pszLogFileName)
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{
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if (g_pFreeLogging == NULL)
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{
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g_pFreeLogging = new CFreeLogging(pszModuleName, pszLogFileName);
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}
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}
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void TermFreeLogging()
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{
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delete g_pFreeLogging;
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g_pFreeLogging = NULL;
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}
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void LogMessage(LPCSTR pszFormatA, ...)
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{
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va_list arglist;
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va_start(arglist, pszFormatA);
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LogMessageExV(LOG_LEVEL_SUCCESS, 0, pszFormatA, arglist);
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va_end(arglist);
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}
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void LogError(DWORD dwError, LPCSTR pszFormatA, ...)
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{
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va_list arglist;
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va_start(arglist, pszFormatA);
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LogMessageExV(LOG_LEVEL_FAILURE, dwError, pszFormatA, arglist);
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va_end(arglist);
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}
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void LogMessageExV(UINT nLevel, DWORD dwError, LPCSTR pszFormatA, va_list args)
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{
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if (g_pFreeLogging != NULL)
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{
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char szBufA[MAX_MSG_LENGTH];
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size_t nRem=0;
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StringCchVPrintfExA(szBufA, _countof(szBufA), NULL, &nRem, MISTSAFE_STRING_FLAGS, pszFormatA, args);
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int cchA = _countof(szBufA) - nRem;
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#ifdef UNICODE
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WCHAR szBufW[MAX_MSG_LENGTH];
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MultiByteToWideChar(CP_ACP, 0, szBufA, cchA+1, szBufW, _countof(szBufW));
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g_pFreeLogging->WriteLine(szBufW, nLevel, dwError);
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#else
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g_pFreeLogging->WriteLine(szBufA, nLevel, dwError);
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#endif
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}
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}
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//============================================================================
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//
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// CFreeLogging implementation
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//
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//============================================================================
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CFreeLogging::CFreeLogging(LPCTSTR pszModuleName, LPCTSTR pszLogFileName)
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: m_cFailedWaits(0),
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m_cLinesWritten(0)
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{
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m_pszModuleName = _tcsdup(pszModuleName);
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if (m_pszModuleName == NULL)
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m_pszModuleName = (LPTSTR)c_szUnknownModuleName;
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m_hMutex = CreateMutex(pszLogFileName);
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m_hFile = OpenLogFile(pszLogFileName);
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}
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CFreeLogging::~CFreeLogging()
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{
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CloseLogFile();
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if (m_hMutex != NULL)
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CloseHandle(m_hMutex);
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if (m_pszModuleName != c_szUnknownModuleName)
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free(m_pszModuleName);
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}
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inline HANDLE CFreeLogging::CreateMutex(LPCTSTR pszMutexName)
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{
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// Create a mutex in the global namespace (works across TS sessions)
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HANDLE hMutex = ::CreateMutex(NULL, FALSE, pszMutexName);
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return hMutex;
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}
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inline HANDLE CFreeLogging::OpenLogFile(LPCTSTR pszLogFileName)
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{
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HANDLE hFile = INVALID_HANDLE_VALUE;
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TCHAR szPath[MAX_PATH+1];
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int cch = GetWindowsDirectory(szPath, _countof(szPath)-1);
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if(cch >0)
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{
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if (szPath[cch-1] != _T('\\'))
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szPath[cch++] = _T('\\');
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HRESULT hr = StringCchCopyEx(szPath + cch, _countof(szPath)-cch, pszLogFileName, NULL, NULL, MISTSAFE_STRING_FLAGS);
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if(FAILED(hr))
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return hFile;
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hFile = CreateFile(szPath, GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
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OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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}
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#ifdef UNICODE
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if (hFile != INVALID_HANDLE_VALUE)
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{
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if (AcquireMutex())
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{
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//
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// Check for the unicode header { FF FE }
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//
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WORD wHeader = 0;
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DWORD cbRead;
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(void)ReadFile(hFile, &wHeader, sizeof(wHeader), &cbRead, NULL);
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//
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// Write the header if there isn't one. This may be due to the
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// file being newly created, or to an ANSI-formatted file.
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//
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if (wHeader != UNICODE_FILE_HEADER)
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{
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SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
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DWORD cbWritten;
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wHeader = UNICODE_FILE_HEADER;
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WriteFile(hFile, &wHeader, sizeof(wHeader), &cbWritten, NULL);
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SetEndOfFile(hFile);
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}
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ReleaseMutex();
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}
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}
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#endif
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return hFile;
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}
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inline void CFreeLogging::CloseLogFile()
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{
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if (m_hFile != INVALID_HANDLE_VALUE)
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{
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// Trim old stuff from the log before closing the file
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TrimLogFile();
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CloseHandle(m_hFile);
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m_hFile = INVALID_HANDLE_VALUE;
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}
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}
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BOOL CFreeLogging::AcquireMutex()
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{
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// In rare case where mutex not created, we allow file operations
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// with no synchronization
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if (m_hMutex == NULL)
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return TRUE;
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// Don't keep waiting if we've been blocked in the past
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if (m_cFailedWaits >= MAX_MUTEX_WAITS)
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return FALSE;
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BOOL fResult = TRUE;
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if (WaitForSingleObject(m_hMutex, MUTEX_TIMEOUT) != WAIT_OBJECT_0)
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{
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fResult = FALSE;
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m_cFailedWaits++;
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}
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return fResult;
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}
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void CFreeLogging::ReleaseMutex()
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{
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if (m_hMutex != NULL) // Note: AcquireMutex succeeds even if m_hMutex is NULL
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{
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::ReleaseMutex(m_hMutex);
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}
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}
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void CFreeLogging::WriteLine(LPCTSTR pszText, UINT nLevel, DWORD dwError)
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{
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if (m_hFile != INVALID_HANDLE_VALUE)
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{
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DWORD cbText = lstrlen(pszText) * sizeof(TCHAR);
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if (AcquireMutex())
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{
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DWORD cbWritten;
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SetFilePointer(m_hFile, 0, NULL, FILE_END);
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//
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// Write time/date/module as a prefix
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//
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// 2001-05-03 13:49:01 21:49:01 CDM Failed Loading module (Error 0x00000005: Access is denied.)
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//
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// NOTE: ISO 8601 format for date/time. Local time first, then GMT.
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//
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TCHAR szPrefix[60];
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SYSTEMTIME sysTime, gmtTime;
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GetLocalTime(&sysTime);
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GetSystemTime(&gmtTime);
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LPCTSTR pszStatus = (nLevel == LOG_LEVEL_SUCCESS) ? _T("Success") : _T("Error ");
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StringCchPrintfEx(szPrefix, _countof(szPrefix), NULL, NULL, MISTSAFE_STRING_FLAGS,
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_T("%04d-%02d-%02d %02d:%02d:%02d %02d:%02d:%02d %s %-13s "),
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sysTime.wYear, sysTime.wMonth, sysTime.wDay,
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sysTime.wHour, sysTime.wMinute, sysTime.wSecond,
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gmtTime.wHour, gmtTime.wMinute, gmtTime.wSecond,
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pszStatus, m_pszModuleName);
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WriteFile(m_hFile, szPrefix, lstrlen(szPrefix) * sizeof(TCHAR), &cbWritten, NULL);
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//
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// Write the message followed by error info (if any) and a newline
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//
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WriteFile(m_hFile, pszText, cbText, &cbWritten, NULL);
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if (nLevel != LOG_LEVEL_SUCCESS)
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{
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TCHAR szError[MAX_ERROR_LENGTH];
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HRESULT hr=S_OK;
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size_t nRem=0;
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// nRem contains the remaining characters in the buffer including the null terminator
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// To get the number of characters written in to the buffer we use
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// int cchErrorPrefix = _countof(szError) - nRem;
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StringCchPrintfEx(szError, _countof(szError), NULL, &nRem, MISTSAFE_STRING_FLAGS, _T(" (Error 0x%08X: "), dwError);
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// Get the number of characters written in to the buffer
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int cchErrorPrefix = _countof(szError) - nRem;
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int cchErrorText = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, dwError, 0,
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szError + cchErrorPrefix, _countof(szError) - cchErrorPrefix - 1, NULL);
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int cchError = cchErrorPrefix + cchErrorText;
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cchError -= 2; // backup past ": " or "\r\n"
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StringCchCopyEx(szError + cchError, _countof(szError)-cchError, _T(")"), NULL, NULL, MISTSAFE_STRING_FLAGS);
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WriteFile(m_hFile, szError, (cchError + 1) * sizeof(TCHAR), &cbWritten, NULL);
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}
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WriteFile(m_hFile, _T("\r\n"), 2 * sizeof(TCHAR), &cbWritten, NULL);
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//
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// If we've written a ton of stuff, trim now rather than waiting
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// for the module to unload. (This check is only for how much this
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// module has written, not how big the log file itself is.)
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//
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if (++m_cLinesWritten > LOG_LINES_TRIM_FROM)
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{
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TrimLogFile();
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m_cLinesWritten = LOG_LINES_TRIM_TO;
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}
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ReleaseMutex();
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}
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}
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}
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// Checks the size of the log file, and trims it if necessary.
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void CFreeLogging::TrimLogFile()
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{
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if (AcquireMutex())
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{
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DWORD cbFile = GetFileSize(m_hFile, NULL);
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if (cbFile > LOG_FILE_BIG_SIZE)
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{
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DWORD cbFileNew = cbFile;
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//
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// Create a memory-mapped file so we can use memmove
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//
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HANDLE hMapping = CreateFileMapping(m_hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
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if (hMapping != NULL)
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{
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LPTSTR pszFileStart = (LPTSTR)MapViewOfFile(hMapping, FILE_MAP_WRITE, 0, 0, 0);
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if (pszFileStart != NULL)
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{
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LPTSTR pszEnd = (LPTSTR)((LPBYTE)pszFileStart + cbFile);
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LPTSTR pszTextStart = pszFileStart;
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#ifdef UNICODE
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pszTextStart++; // skip the 2-byte header
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#endif
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//
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// Count newlines
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//
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int cLines = 0;
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for (LPTSTR pch = pszTextStart; pch < pszEnd; )
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{
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if (*pch == _T('\n'))
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cLines++;
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// REVIEW: in Ansi builds should we call CharNextExA?
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// If so, what code page is the log file in?
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pch++;
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}
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if (cLines > LOG_LINES_TRIM_FROM)
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{
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int cTrimLines = cLines - LOG_LINES_TRIM_TO;
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for (pch = pszTextStart; pch < pszEnd; )
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{
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if (*pch == _T('\n'))
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cTrimLines--;
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// REVIEW: in Ansi builds should we call CharNextExA?
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// If so, what code page is the log file in?
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pch++;
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if (cTrimLines <= 0)
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break;
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}
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// Move more recent data to beginning of file
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int cchMove = (int)(pszEnd - pch);
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memmove(pszTextStart, pch, cchMove * sizeof(TCHAR));
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cbFileNew = (cchMove * sizeof(TCHAR));
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#ifdef UNICODE
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cbFileNew += sizeof(WORD);
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#endif
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}
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UnmapViewOfFile(pszFileStart);
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}
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CloseHandle(hMapping);
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if (cbFileNew != cbFile)
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{
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// Truncate the file, now that we've moved data as needed
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SetFilePointer(m_hFile, cbFileNew, NULL, FILE_BEGIN);
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SetEndOfFile(m_hFile);
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}
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}
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}
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ReleaseMutex();
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}
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}
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