add storage factory (#3922)

api/extensions/storage/aliyun_storage.py

@@ -0,0 +1,48 @@
+from collections.abc import Generator
+from contextlib import closing
+
+import oss2 as aliyun_s3
+from flask import Flask
+
+from extensions.storage.base_storage import BaseStorage
+
+
+class AliyunStorage(BaseStorage):
+    """Implementation for aliyun storage.
+    """
+
+    def __init__(self, app: Flask):
+        super().__init__(app)
+        app_config = self.app.config
+        self.bucket_name = app_config.get('ALIYUN_OSS_BUCKET_NAME')
+        self.client = aliyun_s3.Bucket(
+            aliyun_s3.Auth(app_config.get('ALIYUN_OSS_ACCESS_KEY'), app_config.get('ALIYUN_OSS_SECRET_KEY')),
+            app_config.get('ALIYUN_OSS_ENDPOINT'),
+            self.bucket_name,
+            connect_timeout=30
+        )
+
+    def save(self, filename, data):
+        self.client.put_object(filename, data)
+
+    def load_once(self, filename: str) -> bytes:
+        with closing(self.client.get_object(filename)) as obj:
+            data = obj.read()
+        return data
+
+    def load_stream(self, filename: str) -> Generator:
+        def generate(filename: str = filename) -> Generator:
+            with closing(self.client.get_object(filename)) as obj:
+                while chunk := obj.read(4096):
+                    yield chunk
+
+        return generate()
+
+    def download(self, filename, target_filepath):
+        self.client.get_object_to_file(filename, target_filepath)
+
+    def exists(self, filename):
+        return self.client.object_exists(filename)
+
+    def delete(self, filename):
+        self.client.delete_object(filename)