示例

package logsimport (    "os"    log "github.com/sirupsen/logrus"    "fmt")var Environment stringfunc init() {    if Environment == "production" {        log.SetFormatter(&log.JSONFormatter{})        log.SetOutput(setLogFile("error.logs"))        log.SetLevel(log.WarnLevel)    } else {        log.SetFormatter(&log.TextFormatter{})        log.SetOutput(os.Stdout)        log.SetLevel(log.DebugLevel)    }}func setLogFile(filename string) *os.File{    os.MkdirAll("logs",0666)    f, err := os.OpenFile("logs/"+ filename, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0666)    if err != nil {        fmt.Println("Fail to find", *f, "cServer start Failed")        os.Exit(1)    }    return f}func TestExample() {    // 1. 简单的记录单个域    log.WithFields(log.Fields{        "animal": "walrus",        "size":   10,    }).Info("A group of walrus emerges from the ocean")    // 2. 可复用性    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")}

日志级别

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 logginglog.Fatal("Bye.")// Calls panic() after logginglog.Panic("I'm bailing.")