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