open-consul/command/agent/syslog.go

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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
}