Go_expvar_log包

Go_expvar_log包

package main

import (
	"bytes"
	"expvar"
	"fmt"
	"log"
)

func main() {
	var (
		buf    bytes.Buffer
		logger = log.New(&buf, "INFO: ", log.Llongfile)

		infof = func(info string) {
			logger.Output(2, info)
			fmt.Println(&buf)
			buf = bytes.Buffer{} // 这里需要gc
		}
	)

	float := expvar.NewFloat("")
	float.Set(float64(3.555))
	fmt.Println(float.String())

	infof(float.String())
	infof(float.String())
	infof(float.String())
	infof(float.String())
}

输出

3.555
INFO: E:/code_me/go-utils/tests_cmd/sim/main.go:26: 3.555

INFO: E:/code_me/go-utils/tests_cmd/sim/main.go:27: 3.555

INFO: E:/code_me/go-utils/tests_cmd/sim/main.go:28: 3.555

INFO: E:/code_me/go-utils/tests_cmd/sim/main.go:29: 3.555