golang自带日志框架功能比较简单，仅提供print、panic、fatal三个方法，对于常规的日志切割等功能并未提供支持。 这里推荐使用sirupsen/logrus日志库。 logrus feature 结构化、可插拔的日志模块 完全兼容官方log库接口 Field机制 可扩展的HOOK机制 TEXT与JSON两种可选格式 简单使用示例 std Logger 与官方log类似，logrus也提供了一个名为std的标准logger，对外导出的各类方法直接使用std记录日志，一般可按如下方式使用 ~~~ package main import log "github.com/sirupsen/logrus" func main() { log.Info("hello, world.") } ~~~ 自建Logger实例 ~~~ package main import ( "os" "github.com/sirupsen/logrus" ) // Create a new instance of the logger. You can have any number of instances. var log = logrus.New() func main() { // The API for setting attributes is a little different than the package level // exported logger. See Godoc. log.Out = os.Stdout // You could set this to any `io.Writer` such as a file // file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 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") } ~~~ 输出到本地文件系统 下面示例代码，通过一个hook将日志输出到本地文件系统中，并提供日志切割功能 ~~~ import ( "github.com/lestrrat/go-file-rotatelogs" "github.com/rifflock/lfshook" log "github.com/sirupsen/logrus" "time" "os" "github.com/pkg/errors" "path" ) // config logrus log to local filesystem, with file rotation func ConfigLocalFilesystemLogger(logPath string, logFileName string, maxAge time.Duration, rotationTime time.Duration) { baseLogPaht := path.Join(logPath, logFileName) writer, err := rotatelogs.New( baseLogPaht+".%Y%m%d%H%M", rotatelogs.WithLinkName(baseLogPaht), // 生成软链，指向最新日志文件 rotatelogs.WithMaxAge(maxAge), // 文件最大保存时间 rotatelogs.WithRotationTime(rotationTime), // 日志切割时间间隔 ) if err != nil { log.Errorf("config local file system logger error. %+v", errors.WithStack(err)) } lfHook := lfshook.NewHook(lfshook.WriterMap{ log.DebugLevel: writer, // 为不同级别设置不同的输出目的 log.InfoLevel: writer, log.WarnLevel: writer, log.ErrorLevel: writer, log.FatalLevel: writer, log.PanicLevel: writer, }) log.AddHook(lfHook) } ~~~ 输出到MQ或ES 如下示例代码通过hook将日志输出到amqp消息队列，或者es中。 ~~~ import ( "github.com/vladoatanasov/logrus_amqp" "gopkg.in/olivere/elastic.v5" "gopkg.in/sohlich/elogrus.v2" log "github.com/sirupsen/logrus" "github.com/pkg/errors" ) // config logrus log to amqp func ConfigAmqpLogger(server, username, password, exchange, exchangeType, virtualHost, routingKey string) { hook := logrus_amqp.NewAMQPHookWithType(server, username, password, exchange, exchangeType, virtualHost, routingKey) log.AddHook(hook) } // config logrus log to es func ConfigESLogger(esUrl string, esHOst string, index string) { client, err := elastic.NewClient(elastic.SetURL(esUrl)) if err != nil { log.Errorf("config es logger error. %+v", errors.WithStack(err)) } esHook, err := elogrus.NewElasticHook(client, esHOst, log.DebugLevel, index) if err != nil { log.Errorf("config es logger error. %+v", errors.WithStack(err)) } log.AddHook(esHook) } ~~~