simplify task package implementation

internal/net/http/accesslog/file_logger.go

@@ -0,0 +1,22 @@
+package accesslog
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"github.com/yusing/go-proxy/internal/task"
+)
+
+type File struct {
+	*os.File
+	sync.Mutex
+}
+
+func NewFileAccessLogger(parent task.Parent, cfg *Config) (*AccessLogger, error) {
+	f, err := os.OpenFile(cfg.Path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+	if err != nil {
+		return nil, fmt.Errorf("access log open error: %w", err)
+	}
+	return NewAccessLogger(parent, &File{File: f}, cfg), nil
+}