package log import ( "fmt" "io" kitlog "github.com/go-kit/kit/log" kitlevel "github.com/go-kit/kit/log/level" "github.com/go-kit/kit/log/term" ) const ( msgKey = "_msg" // "_" prefixed to avoid collisions moduleKey = "module" ) type tmLogger struct { srcLogger kitlog.Logger } // Interface assertions var _ Logger = (*tmLogger)(nil) // NewTMTermLogger returns a logger that encodes msg and keyvals to the Writer // using go-kit's log as an underlying logger and our custom formatter. Note // that underlying logger could be swapped with something else. func NewTMLogger(w io.Writer) Logger { // Color by level value colorFn := func(keyvals ...interface{}) term.FgBgColor { if keyvals[0] != kitlevel.Key() { panic(fmt.Sprintf("expected level key to be first, got %v", keyvals[0])) } switch keyvals[1].(kitlevel.Value).String() { case "debug": return term.FgBgColor{Fg: term.DarkGray} case "error": return term.FgBgColor{Fg: term.Red} default: return term.FgBgColor{} } } return &tmLogger{term.NewLogger(w, NewTMFmtLogger, colorFn)} } // NewTMLoggerWithColorFn allows you to provide your own color function. See // NewTMLogger for documentation. func NewTMLoggerWithColorFn(w io.Writer, colorFn func(keyvals ...interface{}) term.FgBgColor) Logger { return &tmLogger{term.NewLogger(w, NewTMFmtLogger, colorFn)} } // Info logs a message at level Info. func (l *tmLogger) Info(msg string, keyvals ...interface{}) { lWithLevel := kitlevel.Info(l.srcLogger) if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil { errLogger := kitlevel.Error(l.srcLogger) kitlog.With(errLogger, msgKey, msg).Log("err", err) } } // Debug logs a message at level Debug. func (l *tmLogger) Debug(msg string, keyvals ...interface{}) { lWithLevel := kitlevel.Debug(l.srcLogger) if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil { errLogger := kitlevel.Error(l.srcLogger) kitlog.With(errLogger, msgKey, msg).Log("err", err) } } // Error logs a message at level Error. func (l *tmLogger) Error(msg string, keyvals ...interface{}) { lWithLevel := kitlevel.Error(l.srcLogger) lWithMsg := kitlog.With(lWithLevel, msgKey, msg) if err := lWithMsg.Log(keyvals...); err != nil { lWithMsg.Log("err", err) } } // With returns a new contextual logger with keyvals prepended to those passed // to calls to Info, Debug or Error. func (l *tmLogger) With(keyvals ...interface{}) Logger { return &tmLogger{kitlog.With(l.srcLogger, keyvals...)} }