Golang Logger.Out方法代碼示例

func SetLogOut(log *logrus.Logger, outString string) error {
	switch outString {
	case "stdout":
		log.Out = os.Stdout
	case "stderr":
		log.Out = os.Stderr
	default:
		f, err := os.OpenFile(outString, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
		if err != nil {
			return err
		}
		log.Out = f
	}
	return nil
}

func SetupLogger(logger *logrus.Logger) {
	fmter := &prefixed.TextFormatter{}
	logger.Formatter = fmter
	logger.Out = os.Stdout
	// Only log the info severity or above.
	logger.Level = logrus.InfoLevel
}

// Create a logrus logger that writes its out output to a buffer for inspection
func getLogrusLogger() (*logrus.Logger, *bytes.Buffer) {
	var logrusLogger *logrus.Logger = logrus.New()

	buffer := &bytes.Buffer{}
	logrusLogger.Out = buffer
	logrusLogger.Formatter = new(logrus.JSONFormatter)
	logrusLogger.Level = logrus.DebugLevel

	return logrusLogger, buffer
}

// Build an adequate instance of the structured logger for this
// application instance. The journal builder may draw data from the
// app instance to configure the journal correctly. This method only
// instantiates a very basic journal; anything more complicated than
// that should be implementing using a boot.Provider to do it.
func (app *App) makeJournal(level logrus.Level) *logrus.Logger {
	const m = "begin writing application journal"
	var journal *logrus.Logger = &logrus.Logger{}
	formatter := new(logrus.TextFormatter)  // std
	journal.Level = level                   // use requested level
	journal.Out = os.Stdout                 // all goes to stdout
	journal.Hooks = make(logrus.LevelHooks) // empty
	journal.Formatter = formatter           // set formatter
	formatter.ForceColors = false           // act smart
	formatter.DisableColors = false         // make pretty
	formatter.DisableTimestamp = false      // is useful
	formatter.FullTimestamp = false         // numbers
	formatter.TimestampFormat = time.StampMilli
	formatter.DisableSorting = false // order!
	moment := time.Now().Format(app.TimeLayout)
	journal.WithField("time", moment).Info(m)
	return journal // is ready to use
}

	"github.com/Sirupsen/logrus"
	"github.com/goadesign/goa"
	"github.com/goadesign/goa/logging/logrus"
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

var _ = Describe("goalogrus", func() {
	var logger *logrus.Logger
	var adapter goa.LogAdapter
	var buf bytes.Buffer

	BeforeEach(func() {
		logger = logrus.New()
		logger.Out = &buf
		adapter = goalogrus.New(logger)
	})

	It("adapts info messages", func() {
		msg := "msg"
		adapter.Info(msg)
		Ω(buf.String()).Should(ContainSubstring(msg))
	})
})

var _ = Describe("FromEntry", func() {
	var entry *logrus.Entry
	var adapter goa.LogAdapter
	var buf bytes.Buffer