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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...)}
}
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