package logger import ( "errors" "go.uber.org/zap" "go.uber.org/zap/zapcore" ) // Logger represents a component // for writing messages to log. // // It is a type alias of // go.uber.org/zap.Logger. type Logger = zap.Logger // Prm groups Logger's parameters. type Prm struct { level zapcore.Level } // ErrNilLogger is returned by functions that // expect a non-nil Logger but received nil. var ErrNilLogger = errors.New("logger is nil") // SetLevelString sets the minimum logging level. // // Returns error of s is not a string representation of zap.Level // value (see zapcore.Level docs). func (p *Prm) SetLevelString(s string) error { return p.level.UnmarshalText([]byte(s)) } // NewLogger constructs a new zap logger instance. // // Logger is built from production logging configuration with: // - parameterized level; // - console encoding; // - ISO8601 time encoding. // // Logger records a stack trace for all messages at or above fatal level. func NewLogger(prm Prm) (*Logger, error) { c := zap.NewProductionConfig() c.Level = zap.NewAtomicLevelAt(prm.level) c.Encoding = "console" c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder return c.Build( zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel)), ) }