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