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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 "time_support.h"
#include "mongo/util/stacktrace.h"
using namespace std;
#ifdef _WIN32
# include <io.h>
# include <fcntl.h>
# include "mongo/util/text.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
#include <boost/filesystem/operations.hpp>
namespace mongo {
int logLevel = 0;
int tlogLevel = 0; // test log level. so we avoid overchattiness (somewhat) in the c++ unit tests
mongo::mutex Logstream::mutex("Logstream");
int Logstream::doneSetup = Logstream::magicNumber();
const char *default_getcurns() { return ""; }
const char * (*getcurns)() = default_getcurns;
Nullstream nullstream;
vector<Tee*>* Logstream::globalTees = 0;
thread_specific_ptr<Logstream> Logstream::tsp;
Nullstream& tlog( int level ) {
if ( !debug && level > tlogLevel )
return nullstream;
if ( level > logLevel )
return nullstream;
return Logstream::get().prolog();
}
class LoggingManager {
public:
LoggingManager()
: _enabled(0) , _file(0) {
}
bool 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(lp);
if ( exists ) {
if ( isdir ) {
cout << "logpath [" << lp << "] should be a filename, not a directory" << endl;
return false;
}
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;
return false;
}
}
}
}
// test path
FILE * test = fopen( lp.c_str() , _append ? "a" : "w" );
if ( ! test ) {
cout << "can't open [" << lp << "] for log file: " << errnoWithDescription() << endl;
return false;
}
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;
return rotate();
}
bool rotate() {
if ( ! _enabled ) {
cout << "LoggingManager not enabled" << endl;
return true;
}
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();
if (0 != rename(_path.c_str(), s.c_str())) {
error() << "Failed to rename " << _path << " to " << s;
return false;
}
}
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;
return false;
}
// 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
return true;
}
private:
bool _enabled;
string _path;
bool _append;
FILE * _file;
} loggingManager;
bool initLogging( const string& lp , bool append ) {
cout << "all output going to: " << lp << endl;
return loggingManager.start( lp , append );
}
bool rotateLogs() {
return loggingManager.rotate();
}
// done *before* static initialization
FILE* Logstream::logfile = stdout;
bool Logstream::isSyslog = false;
string errnoWithDescription(int x) {
#if defined(_WIN32)
if( x < 0 )
x = GetLastError();
#else
if( x < 0 )
x = errno;
#endif
stringstream s;
s << "errno:" << x << ' ';
#if defined(_WIN32)
LPWSTR errorText = NULL;
FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM
|FORMAT_MESSAGE_ALLOCATE_BUFFER
|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
x, 0,
reinterpret_cast<LPWSTR>( &errorText ), // output
0, // minimum size for output buffer
NULL);
if( errorText ) {
string x = toUtf8String(errorText);
for( string::iterator i = x.begin(); i != x.end(); i++ ) {
if( *i == '\n' || *i == '\r' )
break;
s << *i;
}
LocalFree(errorText);
}
else
s << strerror(x);
/*
DWORD n = FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, x,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf, 0, NULL);
*/
#else
s << strerror(x);
#endif
return s.str();
}
void Logstream::logLockless( const StringData& s ) {
if ( s.size() == 0 )
return;
if ( doneSetup == 1717 ) {
#if defined(_WIN32)
int fd = fileno( logfile );
if ( _isatty( fd ) ) {
fflush( logfile );
writeUtf8ToWindowsConsole( s.data(), s.size() );
return;
}
#else
if ( isSyslog ) {
syslog( LOG_INFO , "%s" , s.data() );
return;
}
#endif
if (fwrite(s.data(), s.size(), 1, logfile)) {
fflush(logfile);
}
else {
int x = errno;
cout << "Failed to write to logfile: " << errnoWithDescription(x) << endl;
}
}
else {
cout << s.data();
cout.flush();
}
}
void Logstream::flush(Tee *t) {
const size_t MAX_LOG_LINE = 1024 * 10;
// this ensures things are sane
if ( doneSetup == 1717 ) {
string msg = ss.str();
string threadName = getThreadName();
const char * type = logLevelToString(logLevel);
size_t msgLen = msg.size();
if ( msgLen > MAX_LOG_LINE )
msgLen = MAX_LOG_LINE;
const int spaceNeeded = (int)( msgLen + 64 /* for extra info */ + threadName.size());
int bufSize = 128;
while ( bufSize < spaceNeeded )
bufSize += 128;
BufBuilder b(bufSize);
char* dateStr = b.grow(24);
curTimeString(dateStr);
dateStr[23] = ' '; // change null char to space
if (!threadName.empty()) {
b.appendChar( '[' );
b.appendStr( threadName , false );
b.appendChar( ']' );
b.appendChar( ' ' );
}
for ( int i=0; i<indent; i++ )
b.appendChar( '\t' );
if ( type[0] ) {
b.appendStr( type , false );
b.appendStr( ": " , false );
}
if ( msg.size() > MAX_LOG_LINE ) {
stringstream sss;
sss << "warning: log line attempted (" << msg.size() / 1024 << "k) over max size(" << MAX_LOG_LINE / 1024 << "k)";
sss << ", printing beginning and end ... ";
b.appendStr( sss.str(), false );
const char * xx = msg.c_str();
b.appendBuf( xx , MAX_LOG_LINE / 3 );
b.appendStr( " .......... ", false );
b.appendStr( xx + msg.size() - ( MAX_LOG_LINE / 3 ) );
}
else {
b.appendStr( msg );
}
string out( b.buf() , b.len() - 1);
verify( b.len() < spaceNeeded );
scoped_lock lk(mutex);
if( t ) t->write(logLevel,out);
if ( globalTees ) {
for ( unsigned i=0; i<globalTees->size(); i++ )
(*globalTees)[i]->write(logLevel,out);
}
#if defined(_WIN32)
int fd = fileno( logfile );
if ( _isatty( fd ) ) {
fflush( logfile );
writeUtf8ToWindowsConsole( out.data(), out.size() );
}
#else
if ( isSyslog ) {
syslog( logLevelToSysLogLevel(logLevel) , "%s" , out.data() );
}
#endif
else if ( fwrite( out.data(), out.size(), 1, logfile ) ) {
fflush(logfile);
}
else {
int x = errno;
cout << "Failed to write to logfile: " << errnoWithDescription(x) << ": " << out << endl;
}
#ifdef POSIX_FADV_DONTNEED
// This only applies to pages that have already been flushed
RARELY posix_fadvise(fileno(logfile), 0, 0, POSIX_FADV_DONTNEED);
#endif
}
_init();
}
void Logstream::removeGlobalTee( Tee * tee ) {
if ( !globalTees ) {
return;
}
for( std::vector<Tee*>::iterator i = globalTees->begin(); i != globalTees->end(); ++i ) {
if ( *i == tee ) {
globalTees->erase( i );
return;
}
}
}
void Logstream::setLogFile(FILE* f) {
scoped_lock lk(mutex);
logfile = f;
}
Logstream& Logstream::get() {
if ( StaticObserver::_destroyingStatics ) {
cout << "Logstream::get called in uninitialized state" << endl;
}
Logstream *p = tsp.get();
if( p == 0 )
tsp.reset( p = new Logstream() );
return *p;
}
/* note: can't use malloc herein - may be in signal handler.
logLockless() likely does not comply and should still be fixed todo
likewise class string?
*/
void rawOut( const string &s ) {
if( s.empty() ) return;
char buf[64];
curTimeString(buf);
buf[23] = ' ';
buf[24] = 0;
Logstream::logLockless(buf);
Logstream::logLockless(s);
Logstream::logLockless("\n");
}
void logContext(const char *errmsg) {
if ( errmsg ) {
problem() << errmsg << endl;
}
printStackTrace();
}
}
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