Refactor: move some functions out of api/utils/__init__.py (#10216)

### What problem does this PR solve?

Refactor import modules.

### Type of change

- [x] Refactoring

---------

Signed-off-by: jinhai <haijin.chn@gmail.com>
Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/utils/json.py

@@ -0,0 +1,78 @@
+import datetime
+import json
+from enum import Enum, IntEnum
+from api.utils.common import string_to_bytes, bytes_to_string
+
+
+class BaseType:
+    def to_dict(self):
+        return dict([(k.lstrip("_"), v) for k, v in self.__dict__.items()])
+
+    def to_dict_with_type(self):
+        def _dict(obj):
+            module = None
+            if issubclass(obj.__class__, BaseType):
+                data = {}
+                for attr, v in obj.__dict__.items():
+                    k = attr.lstrip("_")
+                    data[k] = _dict(v)
+                module = obj.__module__
+            elif isinstance(obj, (list, tuple)):
+                data = []
+                for i, vv in enumerate(obj):
+                    data.append(_dict(vv))
+            elif isinstance(obj, dict):
+                data = {}
+                for _k, vv in obj.items():
+                    data[_k] = _dict(vv)
+            else:
+                data = obj
+            return {"type": obj.__class__.__name__,
+                    "data": data, "module": module}
+
+        return _dict(self)
+
+
+class CustomJSONEncoder(json.JSONEncoder):
+    def __init__(self, **kwargs):
+        self._with_type = kwargs.pop("with_type", False)
+        super().__init__(**kwargs)
+
+    def default(self, obj):
+        if isinstance(obj, datetime.datetime):
+            return obj.strftime('%Y-%m-%d %H:%M:%S')
+        elif isinstance(obj, datetime.date):
+            return obj.strftime('%Y-%m-%d')
+        elif isinstance(obj, datetime.timedelta):
+            return str(obj)
+        elif issubclass(type(obj), Enum) or issubclass(type(obj), IntEnum):
+            return obj.value
+        elif isinstance(obj, set):
+            return list(obj)
+        elif issubclass(type(obj), BaseType):
+            if not self._with_type:
+                return obj.to_dict()
+            else:
+                return obj.to_dict_with_type()
+        elif isinstance(obj, type):
+            return obj.__name__
+        else:
+            return json.JSONEncoder.default(self, obj)
+
+
+def json_dumps(src, byte=False, indent=None, with_type=False):
+    dest = json.dumps(
+        src,
+        indent=indent,
+        cls=CustomJSONEncoder,
+        with_type=with_type)
+    if byte:
+        dest = string_to_bytes(dest)
+    return dest
+
+
+def json_loads(src, object_hook=None, object_pairs_hook=None):
+    if isinstance(src, bytes):
+        src = bytes_to_string(src)
+    return json.loads(src, object_hook=object_hook,
+                      object_pairs_hook=object_pairs_hook)