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/** @file log.cpp
*/
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include "assert_util.h"
#include "assert.h"
#include <cmath>
#include "time_support.h"
using namespace std;
#ifdef _WIN32
# include <io.h>
# include <fcntl.h>
#else
# include <cxxabi.h>
# include <sys/file.h>
#endif
#ifdef _WIN32
# define dup2 _dup2 // Microsoft headers use ISO C names
# define fileno _fileno
#endif
namespace mongo {
Nullstream nullstream;
vector<Tee*>* Logstream::globalTees = 0;
thread_specific_ptr<Logstream> Logstream::tsp;
class LoggingManager {
public:
LoggingManager()
: _enabled(0) , _file(0) {
}
void start( const string& lp , bool append ) {
uassert( 10268 , "LoggingManager already started" , ! _enabled );
_append = append;
bool exists = boost::filesystem::exists(lp);
bool isdir = boost::filesystem::is_directory(lp);
bool isreg = boost::filesystem::is_regular_file(lp);
if ( exists ) {
if ( isdir ) {
cout << "logpath [" << lp << "] should be a filename, not a directory" << endl;
dbexit( EXIT_BADOPTIONS );
assert( 0 );
}
if ( ! append ) {
// only attempt rename if log is regular file
if ( isreg ) {
stringstream ss;
ss << lp << "." << terseCurrentTime( false );
string s = ss.str();
if ( ! rename( lp.c_str() , s.c_str() ) ) {
cout << "log file [" << lp << "] exists; copied to temporary file [" << s << "]" << endl;
} else {
cout << "log file [" << lp << "] exists and couldn't make backup; run with --logappend or manually remove file (" << strerror(errno) << ")" << endl;
dbexit( EXIT_BADOPTIONS );
assert( 0 );
}
}
}
}
// test path
FILE * test = fopen( lp.c_str() , _append ? "a" : "w" );
if ( ! test ) {
cout << "can't open [" << lp << "] for log file: " << errnoWithDescription() << endl;
dbexit( EXIT_BADOPTIONS );
assert( 0 );
}
if (append && exists){
// two blank lines before and after
const string msg = "\n\n***** SERVER RESTARTED *****\n\n\n";
massert(14036, errnoWithPrefix("couldn't write to log file"),
fwrite(msg.data(), 1, msg.size(), test) == msg.size());
}
fclose( test );
_path = lp;
_enabled = 1;
rotate();
}
void rotate() {
if ( ! _enabled ) {
cout << "LoggingManager not enabled" << endl;
return;
}
if ( _file ) {
#ifdef POSIX_FADV_DONTNEED
posix_fadvise(fileno(_file), 0, 0, POSIX_FADV_DONTNEED);
#endif
// Rename the (open) existing log file to a timestamped name
stringstream ss;
ss << _path << "." << terseCurrentTime( false );
string s = ss.str();
rename( _path.c_str() , s.c_str() );
}
FILE* tmp = 0; // The new file using the original logpath name
#if _WIN32
// We rename an open log file (above, on next rotation) and the trick to getting Windows to do that is
// to open the file with FILE_SHARE_DELETE. So, we can't use the freopen() call that non-Windows
// versions use because it would open the file without the FILE_SHARE_DELETE flag we need.
//
HANDLE newFileHandle = CreateFileA(
_path.c_str(),
GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if ( INVALID_HANDLE_VALUE != newFileHandle ) {
int newFileDescriptor = _open_osfhandle( reinterpret_cast<intptr_t>(newFileHandle), _O_APPEND );
tmp = _fdopen( newFileDescriptor, _append ? "a" : "w" );
}
#else
tmp = freopen(_path.c_str(), _append ? "a" : "w", stdout);
#endif
if ( !tmp ) {
cerr << "can't open: " << _path.c_str() << " for log file" << endl;
dbexit( EXIT_BADOPTIONS );
assert( 0 );
}
// redirect stdout and stderr to log file
dup2( fileno( tmp ), 1 ); // stdout
dup2( fileno( tmp ), 2 ); // stderr
Logstream::setLogFile(tmp); // after this point no thread will be using old file
#if _WIN32
if ( _file )
fclose( _file ); // In Windows, we still have the old file open, close it now
#endif
#if 0 // enable to test redirection
cout << "written to cout" << endl;
cerr << "written to cerr" << endl;
log() << "written to log()" << endl;
#endif
_file = tmp; // Save new file for next rotation
}
private:
bool _enabled;
string _path;
bool _append;
FILE * _file;
} loggingManager;
void initLogging( const string& lp , bool append ) {
cout << "all output going to: " << lp << endl;
loggingManager.start( lp , append );
}
void rotateLogs( int signal ) {
loggingManager.rotate();
}
// done *before* static initialization
FILE* Logstream::logfile = stdout;
bool Logstream::isSyslog = false;
}
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