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本文次要钻研一下klog的info办法

Info

k8s.io/klog/v2@v2.4.0/klog.go

// Info logs to the INFO log.// Arguments are handled in the manner of fmt.Print; a newline is appended if missing.func Info(args ...interface{}) {    logging.print(infoLog, logging.logr, logging.filter, args...)}
Info应用logging.print打印info级别的日志，参数的解决跟fmt.Print相似，若没有换行则会追加换行

InfoDepth

k8s.io/klog/v2@v2.4.0/klog.go

// InfoDepth acts as Info but uses depth to determine which call frame to log.// InfoDepth(0, "msg") is the same as Info("msg").func InfoDepth(depth int, args ...interface{}) {    logging.printDepth(infoLog, logging.logr, logging.filter, depth, args...)}
InfoDepth能够指定要打印的call frame，Info应用的depth为0

Infoln

k8s.io/klog/v2@v2.4.0/klog.go

// Infoln logs to the INFO log.// Arguments are handled in the manner of fmt.Println; a newline is always appended.func Infoln(args ...interface{}) {    logging.println(infoLog, logging.logr, logging.filter, args...)}
Infoln的参数解决与fmt.Println相似，总是会新增加换行

Infof

k8s.io/klog/v2@v2.4.0/klog.go

// Infof logs to the INFO log.// Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.func Infof(format string, args ...interface{}) {    logging.printf(infoLog, logging.logr, logging.filter, format, args...)}
Infof的参数解决与fmt.Printf相似，若没有换行则会追加换行

InfoS

k8s.io/klog/v2@v2.4.0/klog.go

// InfoS structured logs to the INFO log.// The msg argument used to add constant description to the log line.// The key/value pairs would be join by "=" ; a newline is always appended.//// Basic examples:// >> klog.InfoS("Pod status updated", "pod", "kubedns", "status", "ready")// output:// >> I1025 00:15:15.525108       1 controller_utils.go:116] "Pod status updated" pod="kubedns" status="ready"func InfoS(msg string, keysAndValues ...interface{}) {    logging.infoS(logging.logr, logging.filter, msg, keysAndValues...)}
InfoS用于打印结构化的日志，kv之间用=连贯，总是会新增加换行

实例

import (    "flag"    "k8s.io/klog/v2")func main() {    klog.InitFlags(flag.CommandLine)    defer klog.Flush()    klog.Info("hello by Info")    klog.InfoDepth(0, "hello by InfoDepth 0")    klog.InfoDepth(1, "hello by InfoDepth 1")    klog.Infoln("hello by Infoln")    klog.Infof("hello by %s", "Infof")    klog.InfoS("Pod status updated", "pod", "kubedns", "status", "ready")}

输入

I1226 22:29:10.258496    6455 klog_demo.go:16] hello by InfoI1226 22:29:10.258619    6455 klog_demo.go:17] hello by InfoDepth 0I1226 22:29:10.258642    6455 proc.go:204] hello by InfoDepth 1I1226 22:29:10.258645    6455 klog_demo.go:19] hello by InfolnI1226 22:29:10.258651    6455 klog_demo.go:20] hello by InfofI1226 22:29:10.258658    6455 klog_demo.go:21] "Pod status updated" pod="kubedns" status="ready"

小结

klog提供了Info、InfoDepth、Infoln、Infof、InfoS办法；Info应用logging.print打印info级别的日志，参数的解决跟fmt.Print相似，若没有换行则会追加换行；InfoDepth能够指定要打印的call frame，Info应用的depth为0；Infoln的参数解决与fmt.Println相似，总是会新增加换行；Infof的参数解决与fmt.Printf相似，若没有换行则会追加换行；InfoS用于打印结构化的日志，kv之间用=连贯，总是会新增加换行

doc

  • klog