간단한 golang Logrus 사용법 튜토리얼

package main import ( log "github.com/sirupsen/logrus" ) func main() { log.WithFields(log.Fields{ "animal": "walrus", }).Info("A walrus appears") }

package main import ( "os" log "github.com/sirupsen/logrus" ) func init() { // Log 为JSON而不是默认的ASCII格式。 log.SetFormatter(&log.JSONFormatter{}) // 输出到标准输出，而不是默认的标准错误 //可以是任何io.Writer，请参阅下面的文件例如日志。 log.SetOutput(os.Stdout) // 仅记录严重警告以上。 log.SetLevel(log.WarnLevel) } func main() { log.WithFields(log.Fields{ "animal": "walrus", "size": 10, }).Info("A group of walrus emerges from the ocean") log.WithFields(log.Fields{ "omg": true, "number": 122, }).Warn("The group's number increased tremendously!") log.WithFields(log.Fields{ "omg": true, "number": 100, }).Fatal("The ice breaks!") // 一种常见的模式是通过重用 //从WithFields返回的logrus.Entry 来重用日志记录语句之间的字段 contextLogger := log.WithFields(log.Fields{ "common": "this is a common field", "other": "I also should be logged always", }) contextLogger.Info("I'll be logged with common and other field") contextLogger.Info("Me too") }

package main import ( "os" "github.com/sirupsen/logrus" ) // 创建记录器的一个新实例。您可以有任意多个实例 var log = logrus.New() func main() { // 用于设置属性的API与程序包级别 // 导出的记录器有些不同。见Godoc。 log.Out = os.Stdout // 您可以将其设置为任何`io.Writer` // file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666) // if err == nil { // log.Out = file // } else { // log.Info("Failed to log to file, using default stderr") // } log.WithFields(logrus.Fields{ "animal": "walrus", "size": 10, }).Info("A group of walrus emerges from the ocean") }

log.WithFields(log.Fields{ "event": event, "topic": topic, "key": key, }).Fatal("Failed to send event")

requestLogger := log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip}) requestLogger.Info("something happened on that request") # will log request_id and user_ip requestLogger.Warn("something not great happened")

import ( log "github.com/sirupsen/logrus" "gopkg.in/gemnasium/logrus-airbrake-hook.v2" // the package is named "airbrake" logrus_syslog "github.com/sirupsen/logrus/hooks/syslog" "log/syslog" ) func init() { // Use the Airbrake hook to report errors that have Error severity or above to // an exception tracker. You can create custom hooks, see the Hooks section. log.AddHook(airbrake.NewHook(123, "xyz", "production")) hook, err := logrus_syslog.NewSyslogHook("udp", "localhost:514", syslog.LOG_INFO, "") if err != nil { log.Error("Unable to connect to local syslog daemon") } else { log.AddHook(hook) } }

log.Trace("Something very low level.") log.Debug("Useful debugging information.") log.Info("Something noteworthy happened!") log.Warn("You should probably take a look at this.") log.Error("Something failed but I'm not quitting.") // Calls os.Exit(1) after logging log.Fatal("Bye.") // Calls panic() after logging log.Panic("I'm bailing.")

// Will log anything that is info or above (warn, error, fatal, panic). Default. log.SetLevel(log.InfoLevel)

type MyJSONFormatter struct { } log.SetFormatter(new(MyJSONFormatter)) func (f *MyJSONFormatter) Format(entry *Entry) ([]byte, error) { // Note this doesn't include Time, Level and Message which are available on // the Entry. Consult `godoc` on information about those fields or read the // source of the official loggers. serialized, err := json.Marshal(entry.Data) if err != nil { return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err) } return append(serialized, '\n'), nil }

w := logger.Writer() defer w.Close() srv := http.Server{ // create a stdlib log.Logger that writes to // logrus.Logger. ErrorLog: log.New(w, "", 0), }

logger := logrus.New() logger.Formatter = &logrus.JSONFormatter{} // Use logrus for standard log output // Note that `log` here references stdlib's log // Not logrus imported under the name `log`. log.SetOutput(logger.Writer())