我确信我遗漏了一些简单、基本的问题,我是新手。 假设我不想使用默认记录器,如何设置记录器以便在函数之间共享它?
logissue.go
package main
import (
"fmt"
"github.com/pkg/errors"
"log"
"os"
)
var dlog log.Logger
const logfile string = "killer.log"
const logprefix string = "LOGTEST: "
func setupLogger(filename, prefix string) (*log.Logger, error) {
out, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return nil, errors.Wrap(err, "can't open logfile for writing")
}
return log.New(out, prefix, log.LstdFlags), nil
}
func uselog() error {
fmt.Printf("%T\n", dlog)
dlog.Printf("Hello") ///// < Here is the issue
return nil
}
func main() {
dlog, err := setupLogger(logfile, logprefix)
if err != nil {
fmt.Printf("%+v", err)
}
dlog.Printf("test from main")
uselog()
}
标准输出
log.Logger
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x10970b8]
goroutine 1 [running]:
log.(*Logger).Output(0x116dd00, 0x2, 0xc000016106, 0x5, 0x0, 0x0)
/usr/local/go/src/log/log.go:172 +0x1e8
log.(*Logger).Printf(0x116dd00, 0x10c9202, 0x5, 0x0, 0x0, 0x0)
/usr/local/go/src/log/log.go:179 +0x7e
main.uselog(0xc000088050, 0x10ca43b)
/Users/sequoia/learning/Ex_Files_Go_EssT/Exercise Files/logissue.go:25 +0xc4
main.main()
/Users/sequoia/learning/Ex_Files_Go_EssT/Exercise Files/logissue.go:35 +0xee
exit status 2
killer.log
LOGTEST: 2019/02/17 18:25:12 test from main
最佳答案
因此,首先,根据您上面的代码,您尝试设置一个带有指针记录器的非指针记录器,但该记录器不起作用。其次,您在设置 dlog 时使用 := ,它在您的 main 方法中创建一个作用域变量,而不是设置您的全局变量
关于go - 如何在 Go 中设置和访问 "global"记录器?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54738697/