Feat: conversation variable & variable assigner node

api/configs/app_config.py

@@ -12,19 +12,14 @@
 class DifyConfig(
     # Packaging info
     PackagingInfo,
-
     # Deployment configs
     DeploymentConfig,
-
     # Feature configs
     FeatureConfig,
-
     # Middleware configs
     MiddlewareConfig,
-
     # Extra service configs
     ExtraServiceConfig,
-
     # Enterprise feature configs
     # **Before using, please contact business@dify.ai by email to inquire about licensing matters.**
     EnterpriseFeatureConfig,
@@ -36,7 +31,6 @@ class DifyConfig(
         env_file='.env',
         env_file_encoding='utf-8',
         frozen=True,
-
         # ignore extra attributes
         extra='ignore',
     )
@@ -67,3 +61,5 @@ def HTTP_REQUEST_NODE_READABLE_MAX_TEXT_SIZE(self) -> str:
     SSRF_PROXY_HTTPS_URL: str | None = None
 
     MODERATION_BUFFER_SIZE: int = Field(default=300, description='The buffer size for moderation.')
+
+    MAX_VARIABLE_SIZE: int = Field(default=5 * 1024, description='The maximum size of a variable. default is 5KB.')

api/controllers/console/__init__.py

@@ -17,6 +17,7 @@
     audio,
     completion,
     conversation,
+    conversation_variables,
     generator,
     message,
     model_config,

api/controllers/console/app/conversation_variables.py

@@ -0,0 +1,61 @@
+from flask_restful import Resource, marshal_with, reqparse
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from controllers.console import api
+from controllers.console.app.wraps import get_app_model
+from controllers.console.setup import setup_required
+from controllers.console.wraps import account_initialization_required
+from extensions.ext_database import db
+from fields.conversation_variable_fields import paginated_conversation_variable_fields
+from libs.login import login_required
+from models import ConversationVariable
+from models.model import AppMode
+
+
+class ConversationVariablesApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model(mode=AppMode.ADVANCED_CHAT)
+    @marshal_with(paginated_conversation_variable_fields)
+    def get(self, app_model):
+        parser = reqparse.RequestParser()
+        parser.add_argument('conversation_id', type=str, location='args')
+        args = parser.parse_args()
+
+        stmt = (
+            select(ConversationVariable)
+            .where(ConversationVariable.app_id == app_model.id)
+            .order_by(ConversationVariable.created_at)
+        )
+        if args['conversation_id']:
+            stmt = stmt.where(ConversationVariable.conversation_id == args['conversation_id'])
+        else:
+            raise ValueError('conversation_id is required')
+
+        # NOTE: This is a temporary solution to avoid performance issues.
+        page = 1
+        page_size = 100
+        stmt = stmt.limit(page_size).offset((page - 1) * page_size)
+
+        with Session(db.engine) as session:
+            rows = session.scalars(stmt).all()
+
+        return {
+            'page': page,
+            'limit': page_size,
+            'total': len(rows),
+            'has_more': False,
+            'data': [
+                {
+                    'created_at': row.created_at,
+                    'updated_at': row.updated_at,
+                    **row.to_variable().model_dump(),
+                }
+                for row in rows
+            ],
+        }
+
+
+api.add_resource(ConversationVariablesApi, '/apps/<uuid:app_id>/conversation-variables')

api/controllers/console/app/workflow.py

@@ -74,6 +74,7 @@ def post(self, app_model: App):
             parser.add_argument('hash', type=str, required=False, location='json')
             # TODO: set this to required=True after frontend is updated
             parser.add_argument('environment_variables', type=list, required=False, location='json')
+            parser.add_argument('conversation_variables', type=list, required=False, location='json')
             args = parser.parse_args()
         elif 'text/plain' in content_type:
             try:
@@ -88,7 +89,8 @@ def post(self, app_model: App):
                     'graph': data.get('graph'),
                     'features': data.get('features'),
                     'hash': data.get('hash'),
-                    'environment_variables': data.get('environment_variables')
+                    'environment_variables': data.get('environment_variables'),
+                    'conversation_variables': data.get('conversation_variables'),
                 }
             except json.JSONDecodeError:
                 return {'message': 'Invalid JSON data'}, 400
@@ -100,13 +102,16 @@ def post(self, app_model: App):
         try:
             environment_variables_list = args.get('environment_variables') or []
             environment_variables = [factory.build_variable_from_mapping(obj) for obj in environment_variables_list]
+            conversation_variables_list = args.get('conversation_variables') or []
+            conversation_variables = [factory.build_variable_from_mapping(obj) for obj in conversation_variables_list]
             workflow = workflow_service.sync_draft_workflow(
                 app_model=app_model,
                 graph=args['graph'],
                 features=args['features'],
                 unique_hash=args.get('hash'),
                 account=current_user,
                 environment_variables=environment_variables,
+                conversation_variables=conversation_variables,
             )
         except WorkflowHashNotEqualError:
             raise DraftWorkflowNotSync()

api/core/app/app_config/entities.py

@@ -3,8 +3,9 @@
 
 from pydantic import BaseModel
 
+from core.file.file_obj import FileExtraConfig
 from core.model_runtime.entities.message_entities import PromptMessageRole
-from models.model import AppMode
+from models import AppMode
 
 
 class ModelConfigEntity(BaseModel):
@@ -200,11 +201,6 @@ class TracingConfigEntity(BaseModel):
     tracing_provider: str
 
 
-class FileExtraConfig(BaseModel):
-    """
-    File Upload Entity.
-    """
-    image_config: Optional[dict[str, Any]] = None
 
 
 class AppAdditionalFeatures(BaseModel):

api/core/app/app_config/features/file_upload/manager.py

@@ -1,7 +1,7 @@
 from collections.abc import Mapping
 from typing import Any, Optional
 
-from core.app.app_config.entities import FileExtraConfig
+from core.file.file_obj import FileExtraConfig
 
 
 class FileUploadConfigManager:

api/core/app/apps/advanced_chat/app_generator.py

@@ -113,7 +113,6 @@ def generate(
         contexts.tenant_id.set(application_generate_entity.app_config.tenant_id)
 
         return self._generate(
-            app_model=app_model,
             workflow=workflow,
             user=user,
             invoke_from=invoke_from,
@@ -180,7 +179,6 @@ def single_iteration_generate(self, app_model: App,
         contexts.tenant_id.set(application_generate_entity.app_config.tenant_id)
 
         return self._generate(
-            app_model=app_model,
             workflow=workflow,
             user=user,
             invoke_from=InvokeFrom.DEBUGGER,
@@ -189,12 +187,12 @@ def single_iteration_generate(self, app_model: App,
             stream=stream
         )
 
-    def _generate(self, app_model: App,
+    def _generate(self, *,
                  workflow: Workflow,
                  user: Union[Account, EndUser],
                  invoke_from: InvokeFrom,
                  application_generate_entity: AdvancedChatAppGenerateEntity,
-                 conversation: Conversation = None,
+                 conversation: Conversation | None = None,
                  stream: bool = True) \
             -> Union[dict, Generator[dict, None, None]]:
         is_first_conversation = False