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/
log.go
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/
log.go
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package config
import (
"encoding/xml"
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
log "github.com/cihub/seelog"
)
const (
DefaultLogLevel = "info"
DefaultSyslogHost = "localhost:514"
DefaultSyslogLevel = "error"
defaultLogFilePath = "/var/log/datadog/process-agent.log"
)
var (
levelToSyslogSeverity = map[log.LogLevel]int{
log.TraceLvl: 7,
log.DebugLvl: 7,
log.InfoLvl: 6,
log.WarnLvl: 4,
log.ErrorLvl: 3,
log.CriticalLvl: 2,
log.Off: 7,
}
errInvalidLogLevel = errors.New("invalid log level")
)
type seelogConfig struct {
XMLName xml.Name `xml:"seelog"`
LogLevel string `xml:"minlevel,attr"`
*seelogOutputs
*seelogFormats
}
type seelogOutputs struct {
Filters []seelogFilter `xml:"outputs>filter"`
}
type seelogFilter struct {
XMLName xml.Name `xml:"filter,omitempty"`
Levels string `xml:"levels,attr,omitempty"`
Syslog *seelogFilterAttrs `xml:"conn"`
Console *seelogFilterAttrs `xml:"console"`
File *seelogFilterAttrs `xml:"file"`
}
type seelogFilterAttrs struct {
FormatID string `xml:"formatid,attr,omitempty"`
Net string `xml:"net,attr,omitempty"`
Addr string `xml:"addr,attr,omitempty"`
Path string `xml:"path,attr,omitempty"`
}
type seelogFormats struct {
Formats []seelogFormat `xml:"formats>format"`
}
type seelogFormat struct {
ID string `xml:"id,attr"`
Format string `xml:"format,attr"`
}
func newConsoleFormat() *seelogFormat {
return &seelogFormat{
ID: "console",
Format: "%Date %Time %LEVEL (%File:%Line) - %Msg%n",
}
}
func newSyslogFormat() *seelogFormat {
return &seelogFormat{
ID: "syslog",
Format: "%CustomSyslogHeader(20) %Msg%n",
}
}
func newFileFormat() *seelogFormat {
return &seelogFormat{
ID: "file",
Format: "%Date %Time %LEVEL (%File:%Line) - %Msg%n",
}
}
var syslogFormatter log.FormatterFuncCreator
func registerSyslogFormatter(appName string) error {
hostName := getSyslogHostname()
pid := os.Getpid()
if syslogFormatter == nil {
err := log.RegisterCustomFormatter("CustomSyslogHeader", func(params string) log.FormatterFunc {
return syslogFormatter(params)
})
if err != nil {
return err
}
}
syslogFormatter = func(params string) log.FormatterFunc {
facility := 20
i, err := strconv.Atoi(params)
if err == nil && i >= 0 && i <= 23 {
facility = i
}
return func(message string, level log.LogLevel, context log.LogContextInterface) interface{} {
return fmt.Sprintf("<%d>1 %s %s %s %d - -", facility*8+levelToSyslogSeverity[level],
time.Now().Format("2006-01-02T15:04:05Z07:00"), hostName, appName, pid)
}
}
return nil
}
func newSyslogFilter(host, logLvl string) *seelogFilter {
return &seelogFilter{
Levels: filterLevels(logLvl),
Syslog: &seelogFilterAttrs{
FormatID: "syslog",
Net: "udp",
Addr: host,
},
}
}
func newConsoleFilter(logLvl string) *seelogFilter {
return &seelogFilter{
Levels: filterLevels(logLvl),
Console: &seelogFilterAttrs{
FormatID: "console",
},
}
}
func newFileFilter(logLvl, filename string) *seelogFilter {
return &seelogFilter{
Levels: filterLevels(logLvl),
File: &seelogFilterAttrs{
FormatID: "file",
Path: filename,
},
}
}
func newSeelog() *seelogConfig {
return &seelogConfig{
// Filters override this value
LogLevel: "debug",
seelogOutputs: &seelogOutputs{},
seelogFormats: &seelogFormats{},
}
}
func (s *seelogConfig) addFormat(f *seelogFormat) {
s.Formats = append(s.Formats, *f)
}
func (s *seelogConfig) addFilter(f *seelogFilter) {
s.Filters = append(s.Filters, *f)
}
func (s *seelogConfig) addSyslog(appName, addr, logLvl string) error {
if err := registerSyslogFormatter(appName); err != nil {
return err
}
s.addFilter(newSyslogFilter(addr, logLvl))
s.addFormat(newSyslogFormat())
return nil
}
func (s *seelogConfig) addConsole(logLvl string) {
s.addFilter(newConsoleFilter(logLvl))
s.addFormat(newConsoleFormat())
}
func (s *seelogConfig) addFile(logLvl, filename string) {
s.addFilter(newFileFilter(logLvl, filename))
s.addFormat(newFileFormat())
}
func (cfg *LoggerConfig) SeelogConfig() (*seelogConfig, error) {
s := newSeelog()
if cfg.Filename != "" {
s.addFile(cfg.LogLevel, cfg.Filename)
}
if cfg.Console {
s.addConsole(cfg.LogLevel)
}
if cfg.Syslog {
if err := s.addSyslog("process-agent", cfg.SyslogHost, cfg.SyslogLevel); err != nil {
return nil, err
}
}
return s, nil
}
// LoggerConfig defines the configuration of a logger
type LoggerConfig struct {
AppName string
LogLevel string
Console bool
Syslog bool
SyslogLevel string
SyslogHost string
Filename string
}
// SeelogLogger returns a new seelog Logger
func (cfg *LoggerConfig) SeelogLogger() (log.LoggerInterface, error) {
scfg, err := cfg.SeelogConfig()
if err != nil {
return nil, err
}
xmlConfig, err := xml.MarshalIndent(scfg, "", " ")
if err != nil {
return nil, err
}
return log.LoggerFromConfigAsString(string(xmlConfig))
}
func filterLevels(level string) string {
// https://github.com/cihub/seelog/wiki/Log-levels
if level == "off" {
return "off"
}
levels := "trace,debug,info,warn,error,critical"
return levels[strings.Index(levels, level):]
}
func getSyslogHostname() string {
hostname, err := os.Hostname()
if err != nil {
return "unknown"
}
return hostname
}
func validateLogLevels(levels ...string) error {
logLevels := map[string]struct{}{
"trace": struct{}{},
"debug": struct{}{},
"info": struct{}{},
"warn": struct{}{},
"error": struct{}{},
"critical": struct{}{},
"off": struct{}{},
}
for _, level := range levels {
if _, ok := logLevels[level]; !ok {
return errInvalidLogLevel
}
}
return nil
}
func ReplaceLogger(cfg *LoggerConfig) error {
if err := validateLogLevels(cfg.LogLevel, cfg.SyslogLevel); err != nil {
return err
}
logger, err := cfg.SeelogLogger()
if err != nil {
return err
}
return log.ReplaceLogger(logger)
}
func NewLoggerLevel(logLevel string) error {
loggerConfig := &LoggerConfig{
LogLevel: logLevel,
Filename: defaultLogFilePath,
SyslogLevel: "off",
Console: false,
}
return ReplaceLogger(loggerConfig)
}