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file_target.go
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/
file_target.go
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package logger
import (
"io"
"log"
"os"
"path/filepath"
"runtime"
)
// todo add file rotation (max size + age + backup count)
// todo add file mutex based on file lock (create mutex package)
type FileLogTarget struct {
BaseLogTarget
FilePath string
MaxSize int
MaxBackups int
}
func (t *FileLogTarget) Log(message MessageData) error {
if err := createFileDir(t.FilePath); err != nil {
log.Fatalf("error creating directory: %v", err)
return err
}
f, err := openFile(t.FilePath)
if err != nil {
log.Fatalf("error opening file: %v", err)
return err
}
defer f.Close()
logger := log.New(
io.MultiWriter(os.Stderr, f),
composeLogPrefix(message.Level(),
message.Category()),
log.Ldate|log.Ltime)
logger.Printf("%s\n %s\n", message, stack())
return nil
}
func composeLogPrefix(level string, category string) string {
logPrefix := ""
if level != "" {
logPrefix = level
}
if category != "" {
if logPrefix != "" {
logPrefix += " / "
}
logPrefix += category
}
if logPrefix != "" {
return logPrefix + " "
}
return ""
}
func openFile(filepath string) (*os.File, error) {
f, err := os.OpenFile(filepath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
return f, err
}
func createFileDir(filePath string) error {
fileDir := filepath.Dir(filePath)
if err := os.MkdirAll(fileDir, os.ModePerm); err != nil {
return err
}
return nil
}
//TODO подумать над этим делом.. выглядит как костыль, но иначе прилетает и ненужный мусор
func stack() string {
buf := make([]byte, 1<<16)
stackSize := runtime.Stack(buf, true)
return string(buf[524:stackSize])
}