Golang logger.Infof函数代码示例

// TestFiltering tests the filtering of the logging.
func TestFiltering(t *testing.T) {
	assert := audit.NewTestingAssertion(t, true)

	ownLogger := &testLogger{}
	logger.SetLogger(ownLogger)
	logger.SetLevel(logger.LevelDebug)
	logger.SetFilter(func(level logger.LogLevel, info, msg string) bool {
		return level >= logger.LevelWarning && level <= logger.LevelError
	})

	logger.Debugf("Debug.")
	logger.Infof("Info.")
	logger.Warningf("Warning.")
	logger.Errorf("Error.")
	logger.Criticalf("Critical.")
	assert.Length(ownLogger.logs, 3)

	logger.UnsetFilter()

	ownLogger = &testLogger{}
	logger.SetLogger(ownLogger)
	logger.Debugf("Debug.")
	logger.Infof("Info.")
	logger.Warningf("Warning.")
	logger.Errorf("Error.")
	logger.Criticalf("Critical.")
	assert.Length(ownLogger.logs, 5)
}

func main() {
	config := cachet.Config
	// TODO support log path
	logger.SetLogger(logger.NewTimeformatLogger(os.Stderr, "2006-01-02 15:04:05"))
	logger.SetLevel(logger.LevelDebug)

	logger.Infof("System: %s, API: %s", config.SystemName, config.APIUrl)
	logger.Infof("Starting %d monitors", len(config.MonitorConfigs))

	// initialize monitors
	var allMonitors []*cachet.Monitor
	for _, monconf := range config.MonitorConfigs {
		err, mon := cachet.NewMonitor(&monconf)
		if err == nil {
			err = cachet.SyncMonitor(mon)
			if err != nil {
				logger.Errorf("%v", err)
			}
			allMonitors = append(allMonitors, mon)
		} else {
			logger.Errorf("Parsing monitor error, skipping: %v", err)
		}
	}

	ticker := time.NewTicker(time.Second * time.Duration(config.CheckInterval))
	for range ticker.C {
		for _, m := range allMonitors {
			go m.Check()
		}
	}
}

// logError finally checks logging and formatting before logging an error.
func (d *defaulter) logError(format string, err error) {
	if !d.log {
		return
	}
	format += ": %v"
	if len(d.id) > 0 {
		logger.Infof("(%s) "+format, d.id, err)
	} else {
		logger.Infof(format, err)
	}
}

func (th *TestHandler) Get(ctx web.Context) (bool, error) {
	data := TestRequestData{ctx.Domain(), ctx.Resource(), ctx.ResourceID()}
	switch {
	case ctx.AcceptsContentType(web.ContentTypeXML):
		logger.Infof("get XML")
		ctx.WriteXML(data)
	case ctx.AcceptsContentType(web.ContentTypeJSON):
		logger.Infof("get JSON")
		ctx.WriteJSON(data, true)
	default:
		logger.Infof("get HTML")
		ctx.RenderTemplate("test:context:html", data)
	}
	return true, nil
}

func (i *FileIndex) Save() error {
	i.m.RLock()
	defer i.m.RUnlock()
	idxFile := i.file
	if idxFile == "" {
		err := fmt.Errorf("Yikes! Cannot save index to disk because no file was specified.")
		return err
	}
	if !i.updated {
		return nil
	}
	logger.Infof("Index has changed, saving to disk")
	fp, err := ioutil.TempFile(path.Dir(idxFile), "idx-build")
	if err != nil {
		return err
	}
	zfp := zlib.NewWriter(fp)

	i.updated = false
	enc := gob.NewEncoder(zfp)
	err = enc.Encode(i)
	zfp.Close()
	if err != nil {
		fp.Close()
		return err
	}
	err = fp.Close()
	if err != nil {
		return err
	}
	return os.Rename(fp.Name(), idxFile)
}

func startNodeMonitor() {
	// Never do this if serf isn't set up
	if !config.Config.UseSerf {
		return
	}
	go func() {
		// wait 1 minute before starting to check for nodes being up
		time.Sleep(1 * time.Minute)
		ticker := time.NewTicker(time.Minute)
		for _ = range ticker.C {
			unseen, err := node.UnseenNodes()
			if err != nil {
				logger.Errorf(err.Error())
				continue
			}
			for _, n := range unseen {
				logger.Infof("Haven't seen %s for a while, marking as down", n.Name)
				err = n.UpdateStatus("down")
				if err != nil {
					logger.Errorf(err.Error())
					continue
				}
			}
		}
	}()
	return
}

// logCommand logs a command and its execution status.
func logCommand(cmd string, args []interface{}, err error, log bool) {
	// Format the command for the log entry.
	formatArgs := func() string {
		if args == nil || len(args) == 0 {
			return "(none)"
		}
		output := make([]string, len(args))
		for i, arg := range args {
			output[i] = string(valueToBytes(arg))
		}
		return strings.Join(output, " / ")
	}
	logOutput := func() string {
		format := "CMD %s ARGS %s %s"
		if err == nil {
			return fmt.Sprintf(format, cmd, formatArgs(), "OK")
		}
		return fmt.Sprintf(format, cmd, formatArgs(), "ERROR "+err.Error())
	}
	// Log positive commands only if wanted, errors always.
	if err != nil {
		if errors.IsError(err, ErrServerResponse) || errors.IsError(err, ErrTimeout) {
			return
		}
		logger.Errorf(logOutput())
	} else if log {
		logger.Infof(logOutput())
	}
}

// ProcessEvent reads, validates and emits a configuration.
func (b *configuratorBehavior) ProcessEvent(event cells.Event) error {
	switch event.Topic() {
	case ReadConfigurationTopic:
		// Read configuration
		filename, ok := event.Payload().GetString(ConfigurationFilenamePayload)
		if !ok {
			logger.Errorf("cannot read configuration without filename payload")
			return nil
		}
		logger.Infof("reading configuration from %q", filename)
		cfg, err := etc.ReadFile(filename)
		if err != nil {
			return errors.Annotate(err, ErrCannotReadConfiguration, errorMessages)
		}
		// If wanted then validate it.
		if b.validate != nil {
			err = b.validate(cfg)
			if err != nil {
				return errors.Annotate(err, ErrCannotValidateConfiguration, errorMessages)
			}
		}
		// All done, emit it.
		pvs := cells.PayloadValues{
			ConfigurationPayload: cfg,
		}
		b.cell.EmitNewContext(ConfigurationTopic, pvs, event.Context())
	}
	return nil
}

// Stop implements the Environment interface.
func (env *environment) Stop() error {
	runtime.SetFinalizer(env, nil)
	if err := env.cells.stop(); err != nil {
		return err
	}
	logger.Infof("cells environment %q terminated", env.ID())
	return nil
}

// stop terminates the cell.
func (c *cell) stop() error {
	c.emitTimeoutTicker.Stop()
	err := c.loop.Stop()
	if err != nil {
		logger.Errorf("cell %q terminated with error: %v", c.id, err)
	} else {
		logger.Infof("cell %q terminated", c.id)
	}
	return err
}

func jsonErrorReport(w http.ResponseWriter, r *http.Request, errorStr string, status int) {
	logger.Infof(errorStr)
	jsonError := map[string][]string{"error": []string{errorStr}}
	w.WriteHeader(status)
	enc := json.NewEncoder(w)
	if err := enc.Encode(&jsonError); err != nil {
		logger.Errorf(err.Error())
	}
	return
}

// newCell create a new cell around a behavior.
func newCell(env *environment, id string, behavior Behavior) (*cell, error) {
	logger.Infof("cell '%s' starts", id)
	// Init cell runtime.
	c := &cell{
		env:               env,
		id:                id,
		measuringID:       identifier.Identifier("cells", env.id, "cell", id),
		behavior:          behavior,
		emitters:          newConnections(),
		subscribers:       newConnections(),
		emitTimeoutTicker: time.NewTicker(5 * time.Second),
	}
	// Set configuration.
	if bebs, ok := behavior.(BehaviorEventBufferSize); ok {
		size := bebs.EventBufferSize()
		if size < minEventBufferSize {
			size = minEventBufferSize
		}
		c.eventc = make(chan Event, size)
	} else {
		c.eventc = make(chan Event, minEventBufferSize)
	}
	if brf, ok := behavior.(BehaviorRecoveringFrequency); ok {
		number, duration := brf.RecoveringFrequency()
		if duration.Seconds()/float64(number) < 0.1 {
			number = minRecoveringNumber
			duration = minRecoveringDuration
		}
		c.recoveringNumber = number
		c.recoveringDuration = duration
	} else {
		c.recoveringNumber = minRecoveringNumber
		c.recoveringDuration = minRecoveringDuration
	}
	if bet, ok := behavior.(BehaviorEmitTimeout); ok {
		timeout := bet.EmitTimeout()
		switch {
		case timeout < minEmitTimeout:
			timeout = minEmitTimeout
		case timeout > maxEmitTimeout:
			timeout = maxEmitTimeout
		}
		c.emitTimeout = int(timeout.Seconds() / 5)
	} else {
		c.emitTimeout = int(maxEmitTimeout.Seconds() / 5)
	}
	// Init behavior.
	if err := behavior.Init(c); err != nil {
		return nil, errors.Annotate(err, ErrCellInit, errorMessages, id)
	}
	// Start backend.
	c.loop = loop.GoRecoverable(c.backendLoop, c.checkRecovering, id)
	return c, nil
}

// Test logging with the go logger.
func TestGoLogger(t *testing.T) {
	log.SetOutput(os.Stdout)

	logger.SetLevel(logger.LevelDebug)
	logger.SetLogger(logger.NewGoLogger())

	logger.Debugf("Debug.")
	logger.Infof("Info.")
	logger.Warningf("Warning.")
	logger.Errorf("Error.")
	logger.Criticalf("Critical.")
}

// Save freezes and saves the data store to disk.
func (ds *DataStore) Save(dsFile string) error {
	if !ds.updated {
		return nil
	}
	logger.Infof("Data has changed, saving data store to disk")
	if dsFile == "" {
		err := fmt.Errorf("Yikes! Cannot save data store to disk because no file was specified.")
		return err
	}
	fp, err := ioutil.TempFile(path.Dir(dsFile), "ds-store")
	if err != nil {
		return err
	}
	zfp := zlib.NewWriter(fp)

	fstore := new(dsFileStore)
	dscache := new(bytes.Buffer)
	objList := new(bytes.Buffer)
	ds.m.RLock()
	defer ds.m.RUnlock()
	ds.updated = false

	err = ds.dsc.Save(dscache)
	if err != nil {
		fp.Close()
		return err
	}
	enc := gob.NewEncoder(objList)
	defer func() {
		if x := recover(); x != nil {
			err = fmt.Errorf("Something went wrong encoding the data store with Gob")
		}
	}()
	err = enc.Encode(ds.objList)
	if err != nil {
		fp.Close()
		return err
	}
	fstore.Cache = dscache.Bytes()
	fstore.ObjList = objList.Bytes()
	enc = gob.NewEncoder(zfp)
	err = enc.Encode(fstore)
	zfp.Close()
	if err != nil {
		fp.Close()
		return err
	}
	err = fp.Close()
	if err != nil {
		return err
	}
	return os.Rename(fp.Name(), dsFile)
}

// Test log level filtering.
func TestLogLevelFiltering(t *testing.T) {
	assert := audit.NewTestingAssertion(t, true)

	ownLogger := &testLogger{}
	logger.SetLogger(ownLogger)
	logger.SetLevel(logger.LevelDebug)
	logger.Debugf("Debug.")
	logger.Infof("Info.")
	logger.Warningf("Warning.")
	logger.Errorf("Error.")
	logger.Criticalf("Critical.")
	assert.Length(ownLogger.logs, 5)

	ownLogger = &testLogger{}
	logger.SetLogger(ownLogger)
	logger.SetLevel(logger.LevelError)
	logger.Debugf("Debug.")
	logger.Infof("Info.")
	logger.Warningf("Warning.")
	logger.Errorf("Error.")
	logger.Criticalf("Critical.")
	assert.Length(ownLogger.logs, 2)
}