7 kitlog "github.com/go-kit/kit/log"
8 kitlevel "github.com/go-kit/kit/log/level"
9 "github.com/go-kit/kit/log/term"
13 msgKey = "_msg" // "_" prefixed to avoid collisions
17 type tmLogger struct {
18 srcLogger kitlog.Logger
21 // Interface assertions
22 var _ Logger = (*tmLogger)(nil)
24 // NewTMTermLogger returns a logger that encodes msg and keyvals to the Writer
25 // using go-kit's log as an underlying logger and our custom formatter. Note
26 // that underlying logger could be swapped with something else.
27 func NewTMLogger(w io.Writer) Logger {
28 // Color by level value
29 colorFn := func(keyvals ...interface{}) term.FgBgColor {
30 if keyvals[0] != kitlevel.Key() {
31 panic(fmt.Sprintf("expected level key to be first, got %v", keyvals[0]))
33 switch keyvals[1].(kitlevel.Value).String() {
35 return term.FgBgColor{Fg: term.DarkGray}
37 return term.FgBgColor{Fg: term.Red}
39 return term.FgBgColor{}
43 return &tmLogger{term.NewLogger(w, NewTMFmtLogger, colorFn)}
46 // NewTMLoggerWithColorFn allows you to provide your own color function. See
47 // NewTMLogger for documentation.
48 func NewTMLoggerWithColorFn(w io.Writer, colorFn func(keyvals ...interface{}) term.FgBgColor) Logger {
49 return &tmLogger{term.NewLogger(w, NewTMFmtLogger, colorFn)}
52 // Info logs a message at level Info.
53 func (l *tmLogger) Info(msg string, keyvals ...interface{}) {
54 lWithLevel := kitlevel.Info(l.srcLogger)
55 if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {
56 errLogger := kitlevel.Error(l.srcLogger)
57 kitlog.With(errLogger, msgKey, msg).Log("err", err)
61 // Debug logs a message at level Debug.
62 func (l *tmLogger) Debug(msg string, keyvals ...interface{}) {
63 lWithLevel := kitlevel.Debug(l.srcLogger)
64 if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {
65 errLogger := kitlevel.Error(l.srcLogger)
66 kitlog.With(errLogger, msgKey, msg).Log("err", err)
70 // Error logs a message at level Error.
71 func (l *tmLogger) Error(msg string, keyvals ...interface{}) {
72 lWithLevel := kitlevel.Error(l.srcLogger)
73 lWithMsg := kitlog.With(lWithLevel, msgKey, msg)
74 if err := lWithMsg.Log(keyvals...); err != nil {
75 lWithMsg.Log("err", err)
79 // With returns a new contextual logger with keyvals prepended to those passed
80 // to calls to Info, Debug or Error.
81 func (l *tmLogger) With(keyvals ...interface{}) Logger {
82 return &tmLogger{kitlog.With(l.srcLogger, keyvals...)}