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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Data Differential Utility library
*
* Copyright (C) 2012 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#pragma once
#include <cerrno>
#include <cstdarg>
#include <cstdio>
#include <fcntl.h>
#include <iostream>
#include <string>
#include <syslog.h>
#define UTIL_MAX_ERROR_SIZE 2048
namespace datadifferential {
namespace util {
/** Verbosity levels.
*/
enum verbose_t
{
// Logging this will cause shutdown
VERBOSE_FATAL= LOG_EMERG, // syslog:LOG_EMERG
VERBOSE_ALERT= LOG_ALERT, // syslog:LOG_ALERT
VERBOSE_CRITICAL= LOG_CRIT, // syslog:LOG_CRIT
VERBOSE_ERROR= LOG_ERR, // syslog:LOG_ERR
VERBOSE_WARN= LOG_WARNING, // syslog:LOG_WARNING
VERBOSE_NOTICE= LOG_NOTICE, // syslog:LOG_NOTICE
VERBOSE_INFO= LOG_INFO, // syslog:LOG_INFO
VERBOSE_DEBUG= LOG_DEBUG // syslog:LOG_DEBUG
};
struct log_info_st
{
std::string name;
std::string filename;
int fd;
bool opt_syslog;
bool opt_file;
bool init_success;
log_info_st(const std::string& name_arg, const std::string &filename_arg, bool syslog_arg) :
name(name_arg),
filename(filename_arg),
fd(-1),
opt_syslog(syslog_arg),
opt_file(false),
init_success(false)
{
if (opt_syslog)
{
openlog(name.c_str(), LOG_PID | LOG_NDELAY, LOG_USER);
}
init();
}
void init()
{
if (filename.size())
{
if (filename.compare("stderr") == 0)
{
fd= STDERR_FILENO;
}
else
{
fd= open(filename.c_str(), O_CREAT | O_WRONLY | O_APPEND, 0644);
if (fd == -1)
{
if (opt_syslog)
{
char buffer[1024];
char *getcwd_ret= getcwd(buffer, sizeof(buffer));
syslog(LOG_ERR, "Could not open log file \"%.*s\", from \"%s\", open failed with (%s)",
int(filename.size()), filename.c_str(),
getcwd_ret,
strerror(errno));
}
std::cerr << "Could not open log file for writing, switching to stderr." << std::endl;
fd= STDERR_FILENO;
}
}
opt_file= true;
}
init_success= true;
}
bool initialized() const
{
return init_success;
}
int file() const
{
return fd;
}
void write(verbose_t verbose, const char *format, ...)
{
if (opt_file or opt_syslog)
{
va_list args;
va_start(args, format);
char mesg[BUFSIZ];
int mesg_length= vsnprintf(mesg, sizeof(mesg), format, args);
va_end(args);
if (opt_file)
{
char buffer[UTIL_MAX_ERROR_SIZE];
int buffer_length= snprintf(buffer, sizeof(buffer), "%7s %.*s\n", verbose_name(verbose), mesg_length, mesg);
if (::write(file(), buffer, buffer_length) == -1)
{
std::cerr << "Could not write to log file." << std::endl;
syslog(LOG_EMERG, "gearmand could not open log file %s, got error %s", filename.c_str(), strerror(errno));
}
}
if (opt_syslog)
{
syslog(int(verbose), "%7s %.*s", verbose_name(verbose), mesg_length, mesg);
}
}
}
~log_info_st()
{
if (fd != -1 and fd != STDERR_FILENO)
{
close(fd);
}
if (opt_syslog)
{
closelog();
}
}
private:
const char *verbose_name(verbose_t verbose)
{
switch (verbose)
{
case VERBOSE_FATAL:
return "FATAL";
case VERBOSE_ALERT:
return "ALERT";
case VERBOSE_CRITICAL:
return "CRITICAL";
case VERBOSE_ERROR:
return "ERROR";
case VERBOSE_WARN:
return "WARNING";
case VERBOSE_NOTICE:
return "NOTICE";
case VERBOSE_INFO:
return "INFO";
case VERBOSE_DEBUG:
return "DEBUG";
default:
break;
}
return "UNKNOWN";
}
};
} // namespace util
} // namespace datadifferential
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