Rest framework (#24)

* Add rest framework for API: First Commit

* modify some shell scripts to make variable references safer; modify some python scripts to reduce the code complexity and cyclomatic complexity of functions.

* Add REST API for some webvirtcloud functions. Instance list/delete/create, compute list/delete/create, storages-network list/retrieve. Add swagger and redoc for API interface

* update requirements

Co-authored-by: herengui <herengui@uniontech.com>

storages/api/serializers.py

@@ -0,0 +1,25 @@
+
+from rest_framework import serializers
+from storages.models import Storages, Storage, Volume
+
+
+class StoragesSerializer(serializers.ModelSerializer):
+
+    class Meta:
+        model = Storages
+        fields = ['name', 'status', 'type', 'size', 'volumes']
+
+
+class StorageSerializer(serializers.ModelSerializer):
+    volumes = serializers.ReadOnlyField()
+    class Meta:
+        model = Storage
+        fields = ['state', 'size', 'free', 'status', 'path', 'type', 'autostart', 'volumes'] 
+
+
+class VolumeSerializer(serializers.ModelSerializer):
+    allocation = serializers.ReadOnlyField()
+    meta_prealloc = serializers.BooleanField(write_only=True)
+    class Meta:
+        model = Volume
+        fields = ['name', 'type', 'allocation', 'size', 'meta_prealloc']