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>

computes/api/serializers.py

@@ -0,0 +1,27 @@
+
+from rest_framework import serializers
+from computes.models import Compute
+from vrtManager.connection import (
+    CONN_SOCKET,
+    CONN_SSH,
+    CONN_TCP,
+    CONN_TLS,
+)
+
+
+class ComputeSerializer(serializers.ModelSerializer):
+     # Use <input type="password"> for the input.
+    password = serializers.CharField(style={'input_type': 'password'})
+    # Use a radio input instead of a select input.
+    conn_types = (
+        (CONN_SSH, 'SSH'), 
+        (CONN_TCP, 'TCP'),
+        (CONN_TLS, 'TLS'), 
+        (CONN_SOCKET, 'SOCK'),
+    )
+    type = serializers.ChoiceField(choices=conn_types)
+
+
+    class Meta:
+        model = Compute
+        fields = ['id', 'name', 'hostname', 'login', 'password', 'type', 'details']