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mirror of https://github.com/rclone/rclone synced 2024-12-24 15:43:45 +01:00
rclone/fs/log/caller_hook.go
2019-07-28 12:05:50 +01:00

73 lines
1.4 KiB
Go

package log
import (
"fmt"
"runtime"
"strings"
"github.com/sirupsen/logrus"
)
// CallerHook for log the calling file and line of the fine
type CallerHook struct {
Field string
Skip int
levels []logrus.Level
}
// NewCallerHook use to make an hook
func NewCallerHook(levels ...logrus.Level) logrus.Hook {
hook := CallerHook{
Field: "source",
Skip: 7,
levels: levels,
}
if len(hook.levels) == 0 {
hook.levels = logrus.AllLevels
}
return &hook
}
// Levels implement applied hook to which levels
func (h *CallerHook) Levels() []logrus.Level {
return logrus.AllLevels
}
// Fire logs the information of context (filename and line)
func (h *CallerHook) Fire(entry *logrus.Entry) error {
entry.Data[h.Field] = findCaller(h.Skip)
return nil
}
// findCaller ignores the caller relevent to logrus or fslog then find out the exact caller
func findCaller(skip int) string {
file := ""
line := 0
for i := 0; i < 10; i++ {
file, line = getCaller(skip + i)
if !strings.HasPrefix(file, "logrus") && strings.Index(file, "log.go") < 0 {
break
}
}
return fmt.Sprintf("%s:%d", file, line)
}
func getCaller(skip int) (string, int) {
_, file, line, ok := runtime.Caller(skip)
// fmt.Println(file,":",line)
if !ok {
return "", 0
}
n := 0
for i := len(file) - 1; i > 0; i-- {
if file[i] == '/' {
n++
if n >= 2 {
file = file[i+1:]
break
}
}
}
return file, line
}