package agent import ( "bytes" "github.com/hashicorp/go-syslog" "github.com/hashicorp/logutils" ) // levelPriority is used to map a log level to a // syslog priority level var levelPriority = map[string]gsyslog.Priority{ "TRACE": gsyslog.LOG_DEBUG, "DEBUG": gsyslog.LOG_INFO, "INFO": gsyslog.LOG_NOTICE, "WARN": gsyslog.LOG_WARNING, "ERR": gsyslog.LOG_ERR, "CRIT": gsyslog.LOG_CRIT, } // SyslogWrapper is used to cleaup log messages before // writing them to a Syslogger. Implements the io.Writer // interface. type SyslogWrapper struct { l gsyslog.Syslogger filt *logutils.LevelFilter } // Write is used to implement io.Writer func (s *SyslogWrapper) Write(p []byte) (int, error) { // Skip syslog if the log level doesn't apply if !s.filt.Check(p) { return 0, nil } // Extract log level var level string afterLevel := p x := bytes.IndexByte(p, '[') if x >= 0 { y := bytes.IndexByte(p[x:], ']') if y >= 0 { level = string(p[x+1 : x+y]) afterLevel = p[x+y+2:] } } // Each log level will be handled by a specific syslog priority priority, ok := levelPriority[level] if !ok { priority = gsyslog.LOG_NOTICE } // Attempt the write err := s.l.WriteLevel(priority, afterLevel) return len(p), err }