frostfs-node/lib/fix/logger/logger.go

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package logger
import (
"strings"
"github.com/spf13/viper"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
const (
formatJSON = "json"
formatConsole = "console"
defaultSamplingInitial = 100
defaultSamplingThereafter = 100
)
func safeLevel(lvl string) zap.AtomicLevel {
switch strings.ToLower(lvl) {
case "debug":
return zap.NewAtomicLevelAt(zap.DebugLevel)
case "warn":
return zap.NewAtomicLevelAt(zap.WarnLevel)
case "error":
return zap.NewAtomicLevelAt(zap.ErrorLevel)
case "fatal":
return zap.NewAtomicLevelAt(zap.FatalLevel)
case "panic":
return zap.NewAtomicLevelAt(zap.PanicLevel)
default:
return zap.NewAtomicLevelAt(zap.InfoLevel)
}
}
// NewLogger is a logger's constructor.
func NewLogger(v *viper.Viper) (*zap.Logger, error) {
c := zap.NewProductionConfig()
c.OutputPaths = []string{"stdout"}
c.ErrorOutputPaths = []string{"stdout"}
if v.IsSet("logger.sampling") {
c.Sampling = &zap.SamplingConfig{
Initial: defaultSamplingInitial,
Thereafter: defaultSamplingThereafter,
}
if val := v.GetInt("logger.sampling.initial"); val > 0 {
c.Sampling.Initial = val
}
if val := v.GetInt("logger.sampling.thereafter"); val > 0 {
c.Sampling.Thereafter = val
}
}
// logger level
c.Level = safeLevel(v.GetString("logger.level"))
traceLvl := safeLevel(v.GetString("logger.trace_level"))
// logger format
switch f := v.GetString("logger.format"); strings.ToLower(f) {
case formatConsole:
c.Encoding = formatConsole
default:
c.Encoding = formatJSON
}
// logger time
c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
l, err := c.Build(
// enable trace only for current log-level
zap.AddStacktrace(traceLvl))
if err != nil {
return nil, err
}
if v.GetBool("logger.no_disclaimer") {
return l, nil
}
name := v.GetString("app.name")
version := v.GetString("app.version")
return l.With(
zap.String("app_name", name),
zap.String("app_version", version)), nil
}