status-im/status-go

package logutils

import (
    stdlog "log"

    "github.com/ethereum/go-ethereum/log"
)

// NewStdHandler returns handler that uses logger from golang std lib.
func NewStdHandler(fmtr log.Format) log.Handler {
    return log.FuncHandler(func(r *log.Record) error {
        line := fmtr.Format(r)
        // 8 is a number of frames that will be skipped when log is printed.
        // this is needed to show the file (with line number) where call to a logger was made
        return stdlog.Output(8, string(line))
    })
}