refactor: refactor load balancing policy of plugins

src/spaceone/plugin/manager/plugin_manager/__init__.py

@@ -193,9 +193,19 @@ def update_plugin_state(
         if len(endpoints) == 0:
             endpoints = [endpoint]
 
-        return plugin_vo.update(
-            {"state": state, "endpoint": endpoint, "endpoints": endpoints}
-        )
+        endpoints = sorted(endpoints)
+
+        if plugin_vo.endpoints != endpoints:
+            return plugin_vo.update(
+                {
+                    "state": state,
+                    "endpoint": endpoint,
+                    "endpoints": endpoints,
+                    "current_index": 0,
+                }
+            )
+        else:
+            return plugin_vo.update({"state": state, "endpoint": endpoint})
 
     def make_reprovision(self, supervisor_id, plugin_id, version):
         def _rollback(old_data: dict):

src/spaceone/plugin/model/installed_plugin_model.py

@@ -4,69 +4,75 @@
 
 from spaceone.core.model.mongo_model import MongoModel
 from spaceone.plugin.model.supervisor_model import Supervisor
-from spaceone.plugin.manager.plugin_manager.plugin_state import PROVISIONING, ACTIVE, ERROR, RE_PROVISIONING
+from spaceone.plugin.manager.plugin_manager.plugin_state import (
+    PROVISIONING,
+    ACTIVE,
+    ERROR,
+    RE_PROVISIONING,
+)
 
-__all__ = ['InstalledPlugin']
+__all__ = ["InstalledPlugin"]
 
 
 class InstalledPlugin(MongoModel):
     # TODO: check plugin_id max length
-    plugin_id = StringField(max_length=255, required=True, null=False, unique_with=['version', 'supervisor_id'])
+    plugin_id = StringField(
+        max_length=255,
+        required=True,
+        null=False,
+        unique_with=["version", "supervisor_id"],
+    )
     supervisor_id = StringField(max_length=255, required=True, null=False)
-    supervisor = ReferenceField('Supervisor', reverse_delete_rule=CASCADE,  required=True, null=False)
+    supervisor = ReferenceField(
+        "Supervisor", reverse_delete_rule=CASCADE, required=True, null=False
+    )
     name = StringField(max_length=255)
     image = StringField(max_length=255)
     version = StringField(max_length=255)
-    state = StringField(max_length=40,
-                        default=PROVISIONING,
-                        choices=(PROVISIONING, ACTIVE, ERROR, RE_PROVISIONING))
+    state = StringField(
+        max_length=40,
+        default=PROVISIONING,
+        choices=(PROVISIONING, ACTIVE, ERROR, RE_PROVISIONING),
+    )
     endpoint = StringField(max_length=255)
     endpoints = ListField(StringField(max_length=255))
+    current_index = IntField(default=0)
     domain_id = StringField(max_length=40, required=True, null=False)
     created_at = DateTimeField(auto_now_add=True)
     updated_at = DateTimeField(auto_now_add=True)
     endpoint_called_at = DateTimeField(default=None, null=True)
 
     meta = {
-        'updatable_fields': [
-            'name',
-            'updated_at',
-            'state',
-            'endpoint',
-            'endpoints',
-            'endpoint_called_at'
+        "updatable_fields": [
+            "name",
+            "updated_at",
+            "state",
+            "endpoint",
+            "endpoints",
+            "current_index",
+            "endpoint_called_at",
         ],
-        'minimal_fields': [
-            'plugin_id',
-            'version',
-            'state',
-            'endpoint',
-            'endpoints'
+        "minimal_fields": ["plugin_id", "version", "state", "endpoint", "endpoints"],
+        "change_query_keys": {"hostname": "supervisor.hostname"},
+        "reference_query_keys": {"supervisor": Supervisor},
+        "ordering": ["name"],
+        "indexes": [
+            "plugin_id",
+            "supervisor_id",
+            "supervisor",
+            "domain_id",
+            "name",
+            "image",
+            "version",
+            "state",
+            "endpoint_called_at",
         ],
-        'change_query_keys': {
-            'hostname': 'supervisor.hostname'
-        },
-        'reference_query_keys': {
-            'supervisor': Supervisor
-        },
-        'ordering': ['name'],
-        'indexes': [
-            'plugin_id',
-            'supervisor_id',
-            'supervisor',
-            'domain_id',
-            'name',
-            'image',
-            'version',
-            'state',
-            'endpoint_called_at'
-        ]
     }
 
     def update(self, data):
-        data['updated_at'] = datetime.datetime.now()
+        data["updated_at"] = datetime.datetime.now()
         return super().update(data)
 
     def update_endpoint_called_at(self):
-        data = {'endpoint_called_at': datetime.datetime.now()}
+        data = {"endpoint_called_at": datetime.datetime.now()}
         return super().update(data)

src/spaceone/plugin/service/plugin_service.py

@@ -251,7 +251,14 @@ def _select_endpoint(self, plugin_ref, updated_version=None):
         endpoints = installed_plugin.endpoints
         if endpoints:
             _LOGGER.debug(f"[_select_endpoint] {endpoints}")
-            endpoint = self._select_one(endpoints)
+            # endpoint = self._select_one(endpoints)
+
+            installed_plugin = installed_plugin.increment("current_index")
+
+            if installed_plugin.current_index >= len(endpoints):
+                installed_plugin = installed_plugin.update({"current_index": 0})
+
+            endpoint = endpoints[installed_plugin.current_index]
 
         endpoint_info = {"endpoint": endpoint}