fix #426 刮削下载图片重试

app/utils/common.py

@@ -0,0 +1,34 @@
+import time
+from typing import Any
+
+
+def retry(ExceptionToCheck: Any,
+          tries: int = 3, delay: int = 3, backoff: int = 2, logger: Any = None):
+    """
+    :param ExceptionToCheck: 需要捕获的异常
+    :param tries: 重试次数
+    :param delay: 延迟时间
+    :param backoff: 延迟倍数
+    :param logger: 日志对象
+    """
+
+    def deco_retry(f):
+        def f_retry(*args, **kwargs):
+            mtries, mdelay = tries, delay
+            while mtries > 1:
+                try:
+                    return f(*args, **kwargs)
+                except ExceptionToCheck as e:
+                    msg = f"{str(e)}, {mdelay} 秒后重试 ..."
+                    if logger:
+                        logger.warn(msg)
+                    else:
+                        print(msg)
+                    time.sleep(mdelay)
+                    mtries -= 1
+                    mdelay *= backoff
+            return f(*args, **kwargs)
+
+        return f_retry
+
+    return deco_retry