AdGuardHome/internal/home/log.go

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package home
import (
"fmt"
"path/filepath"
"runtime"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/stringutil"
"gopkg.in/natefinch/lumberjack.v2"
"gopkg.in/yaml.v3"
)
// configSyslog is used to indicate that syslog or eventlog (win) should be used
// for logger output.
const configSyslog = "syslog"
// configureLogger configures logger level and output.
func configureLogger(opts options) (err error) {
ls := getLogSettings(opts)
// Configure logger level.
if ls.Verbose {
log.SetLevel(log.DEBUG)
}
// Make sure that we see the microseconds in logs, as networking stuff can
// happen pretty quickly.
log.SetFlags(log.LstdFlags | log.Lmicroseconds)
// Write logs to stdout by default.
if ls.File == "" {
return nil
}
if ls.File == configSyslog {
// Use syslog where it is possible and eventlog on Windows.
err = aghos.ConfigureSyslog(serviceName)
if err != nil {
return fmt.Errorf("cannot initialize syslog: %w", err)
}
return nil
}
logFilePath := ls.File
if !filepath.IsAbs(logFilePath) {
logFilePath = filepath.Join(Context.workDir, logFilePath)
}
log.SetOutput(&lumberjack.Logger{
Filename: logFilePath,
Compress: ls.Compress,
LocalTime: ls.LocalTime,
MaxBackups: ls.MaxBackups,
MaxSize: ls.MaxSize,
MaxAge: ls.MaxAge,
})
return nil
}
// getLogSettings returns a log settings object properly initialized from opts.
func getLogSettings(opts options) (ls *logSettings) {
configLogSettings := config.Log
ls = readLogSettings()
if ls == nil {
// Use default log settings.
ls = &configLogSettings
}
// Command-line arguments can override config settings.
if opts.verbose {
ls.Verbose = true
}
// TODO(a.garipov): Use cmp.Or in Go 1.22.
ls.File = stringutil.Coalesce(opts.logFile, ls.File)
if opts.runningAsService && ls.File == "" && runtime.GOOS == "windows" {
// When running as a Windows service, use eventlog by default if
// nothing else is configured. Otherwise, we'll lose the log output.
ls.File = configSyslog
}
return ls
}
// readLogSettings reads logging settings from the config file. We do it in a
// separate method in order to configure logger before the actual configuration
// is parsed and applied.
func readLogSettings() (ls *logSettings) {
conf := &configuration{}
yamlFile, err := readConfigFile()
if err != nil {
return nil
}
err = yaml.Unmarshal(yamlFile, conf)
if err != nil {
log.Error("Couldn't get logging settings from the configuration: %s", err)
}
return &conf.Log
}