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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* 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 "Logger.h"
#include "Options.h"
#include "qpid/memory.h"
#include "qpid/sys/Thread.h"
#include <boost/pool/detail/singleton.hpp>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/scoped_ptr.hpp>
#include <algorithm>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <syslog.h>
namespace qpid {
namespace log {
using namespace std;
typedef sys::Mutex::ScopedLock ScopedLock;
inline void Logger::enable_unlocked(Statement* s) {
s->enabled=selector.isEnabled(s->level, s->function);
}
struct OstreamOutput : public Logger::Output {
OstreamOutput(std::ostream& o) : out(&o) {}
OstreamOutput(const string& file)
: out(new ofstream(file.c_str())), mine(out)
{
if (!out->good())
throw Exception("Can't open log file: "+file);
}
void log(const Statement&, const std::string& m) {
*out << m << flush;
}
ostream* out;
boost::scoped_ptr<ostream> mine;
};
struct SyslogOutput : public Logger::Output {
SyslogOutput(const std::string& name, int facility_=LOG_USER)
: progName(name), facility(facility_)
{
::openlog(name.c_str(), LOG_PID, facility);
}
~SyslogOutput() {
::closelog();
}
void log(const Statement& s, const std::string& m)
{
syslog(LevelTraits::priority(s.level), "%s", m.c_str());
}
std::string progName;
int facility;
};
Logger& Logger::instance() {
return boost::details::pool::singleton_default<Logger>::instance();
}
Logger::Logger() : flags(0) {
// Initialize myself from env variables so all programs
// (e.g. tests) can use logging even if they don't parse
// command line args.
Options opts;
opts.parse(0, 0);
configure(opts,"");
}
Logger::~Logger() {}
void Logger::select(const Selector& s) {
ScopedLock l(lock);
selector=s;
std::for_each(statements.begin(), statements.end(),
boost::bind(&Logger::enable_unlocked, this, _1));
}
Logger::Output::Output() {}
Logger::Output::~Output() {}
void Logger::log(const Statement& s, const std::string& msg) {
// Format the message outside the lock.
std::ostringstream os;
if (flags&TIME)
os << boost::posix_time::second_clock::local_time() << " ";
if (flags&LEVEL)
os << LevelTraits::name(s.level) << " ";
if (flags&THREAD)
os << "[" << hex << qpid::sys::Thread::logId() << "] ";
if (flags&FILE)
os << s.file << ":";
if (flags&LINE)
os << dec << s.line << ":";
if (flags&FUNCTION)
os << s.function << ":";
if (flags & (FILE|LINE|FUNCTION))
os << " ";
os << msg << endl;
std::string formatted=os.str();
{
ScopedLock l(lock);
std::for_each(outputs.begin(), outputs.end(),
boost::bind(&Output::log, _1, s, formatted));
}
}
void Logger::output(std::auto_ptr<Output> out) {
ScopedLock l(lock);
outputs.push_back(out.release());
}
void Logger::output(std::ostream& out) {
output(make_auto_ptr<Output>(new OstreamOutput(out)));
}
void Logger::syslog(const std::string& progName) {
output(make_auto_ptr<Output>(new SyslogOutput(progName)));
}
void Logger::output(const std::string& name) {
if (name=="stderr")
output(clog);
else if (name=="stdout")
output(cout);
else if (name=="syslog")
syslog(syslogName);
else
output(make_auto_ptr<Output>(new OstreamOutput(name)));
}
void Logger::clear() {
select(Selector()); // locked
format(0); // locked
ScopedLock l(lock);
outputs.clear();
}
void Logger::format(int formatFlags) {
ScopedLock l(lock);
flags=formatFlags;
}
static int bitIf(bool test, int bit) {
return test ? bit : 0;
}
int Logger::format(const Options& opts) {
int flags=
bitIf(opts.level, LEVEL) |
bitIf(opts.time, TIME) |
bitIf(opts.source, (FILE|LINE)) |
bitIf(opts.function, FUNCTION) |
bitIf(opts.thread, THREAD);
format(flags);
return flags;
}
void Logger::add(Statement& s) {
ScopedLock l(lock);
enable_unlocked(&s);
statements.insert(&s);
}
void Logger::configure(const Options& opts, const std::string& prog)
{
clear();
Options o(opts);
if (o.trace)
o.selectors.push_back("trace+");
{
ScopedLock l(lock);
syslogName=prog;
}
format(o);
select(Selector(o));
void (Logger::* outputFn)(const std::string&) = &Logger::output;
for_each(o.outputs.begin(), o.outputs.end(),
boost::bind(outputFn, this, _1));
}
}} // namespace qpid::log
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