fix(workflow): handle non-stream output field changes, add file type support to HTTP node, fix iteration node flattening bug

api/app/core/workflow/engine/variable_pool.py

@@ -73,7 +73,7 @@ class VariableStruct(BaseModel, Generic[T]):
         instance:
             The concrete variable object. The actual Python type is
             represented by the generic parameter ``T`` (e.g. StringVariable,
-            NumberVariable, ArrayObject[StringVariable]).
+            NumberVariable, ArrayVariable[StringVariable]).
         mut:
             Whether the variable is mutable.
     """
@@ -152,6 +152,20 @@ class VariablePool:
             return None
         return var_instance
 
+    def get_instance(
+            self,
+            selector: str,
+            default: Any = None,
+            strict: bool = True
+    ):
+        variable_struct = self._get_variable_struct(selector)
+        if variable_struct is None:
+            if strict:
+                raise KeyError(f"{selector} not exist")
+            return default
+
+        return variable_struct.instance
+
     def get_value(
             self,
             selector: str,

api/app/core/workflow/nodes/cycle_graph/node.py

@@ -66,7 +66,7 @@ class CycleGraphNode(BaseNode):
                 if config.flatten:
                     outputs['output'] = config.output_type
                 else:
-                    outputs['output'] = VariableType.ARRAY_STRING
+                    outputs['output'] = VariableType.NESTED_ARRAY
             else:
                 outputs['output'] = VariableType(f"array[{config.output_type}]")
             return outputs

api/app/core/workflow/nodes/http_request/node.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 import logging
+import uuid
 from typing import Any, Callable, Coroutine
 
 import httpx
@@ -13,6 +14,7 @@ from app.core.workflow.nodes.base_node import BaseNode
 from app.core.workflow.nodes.enums import HttpRequestMethod, HttpErrorHandle, HttpAuthType, HttpContentType
 from app.core.workflow.nodes.http_request.config import HttpRequestNodeConfig, HttpRequestNodeOutput
 from app.core.workflow.variable.base_variable import VariableType
+from app.core.workflow.variable.variable_objects import FileVariable, ArrayVariable
 
 logger = logging.getLogger(__file__)
 
@@ -115,7 +117,7 @@ class HttpRequestNode(BaseNode):
             params[self._render_template(key, variable_pool)] = self._render_template(value, variable_pool)
         return params
 
-    def _build_content(self, variable_pool: VariablePool) -> dict[str, Any]:
+    async def _build_content(self, variable_pool: VariablePool) -> dict[str, Any]:
         """
         Build HTTP request body arguments for httpx request methods.
 
@@ -135,16 +137,35 @@ class HttpRequestNode(BaseNode):
                 ))
             case HttpContentType.FROM_DATA:
                 data = {}
+                content["files"] = {}
                 for item in self.typed_config.body.data:
                     if item.type == "text":
-                        data[self._render_template(item.key, variable_pool)] = self._render_template(item.value, variable_pool)
+                        data[self._render_template(item.key, variable_pool)] = self._render_template(item.value,
+                                                                                                     variable_pool)
                     elif item.type == "file":
-                        # TODO: File support (Feature)
+                        content["files"][self._render_template(item.key, variable_pool)] = (
-                        pass
+                            uuid.uuid4().hex,
+                            await variable_pool.get_instance(item.value).get_content()
+                        )
                 content["data"] = data
             case HttpContentType.BINARY:
-                # TODO: File support (Feature)
+                content["files"] = []
-                pass
+                file_instence = variable_pool.get_instance(self.typed_config.body.data)
+                if isinstance(file_instence, ArrayVariable):
+                    for v in file_instence.value:
+                        if isinstance(v, FileVariable):
+                            content["files"].append(
+                                (
+                                    "files", (uuid.uuid4().hex, await v.get_content())
+                                )
+                            )
+                elif isinstance(file_instence, FileVariable):
+                    content["files"].append(
+                        (
+                            "file", (uuid.uuid4().hex, await file_instence.get_content())
+                        )
+                    )
+
             case HttpContentType.WWW_FORM:
                 content["data"] = json.loads(self._render_template(
                     json.dumps(self.typed_config.body.data), variable_pool
@@ -207,7 +228,7 @@ class HttpRequestNode(BaseNode):
                     request_func = self._get_client_method(client)
                     resp = await request_func(
                         url=self._render_template(self.typed_config.url, variable_pool),
-                        **self._build_content(variable_pool)
+                        **(await self._build_content(variable_pool))
                     )
                     resp.raise_for_status()
                     logger.info(f"Node {self.node_id}: HTTP request succeeded")

api/app/core/workflow/variable/variable_objects.py

@@ -1,8 +1,10 @@
 from typing import Any, TypeVar, Type, Generic
 
+import httpx
 from deprecated import deprecated
 
 from app.core.workflow.variable.base_variable import BaseVariable, VariableType, FileObject, FileType
+from app.core.config import settings
 
 T = TypeVar("T", bound=BaseVariable)
 
@@ -80,8 +82,23 @@ class FileVariable(BaseVariable):
     def get_value(self) -> Any:
         return self.value.model_dump()
 
+    async def get_content(self):
+        total_bytes = 0
+        chunks = []
 
-class ArrayObject(BaseVariable, Generic[T]):
+        async with httpx.AsyncClient() as client:
+            async with client.stream("GET", self.value.url) as resp:
+                resp.raise_for_status()
+                async for chunk in resp.aiter_bytes(8192):
+                    total_bytes += len(chunk)
+                    if total_bytes > settings.MAX_FILE_SIZE:
+                        raise ValueError(f"File too large: {total_bytes} bytes")
+                    chunks.append(chunk)
+
+        return b"".join(chunks)
+
+
+class ArrayVariable(BaseVariable, Generic[T]):
     type = 'array'
 
     def __init__(self, child_type: Type[T], value: list[Any]):
@@ -108,7 +125,7 @@ class ArrayObject(BaseVariable, Generic[T]):
         return [v.get_value() for v in self.value]
 
 
-class NestedArrayObject(BaseVariable):
+class NestedArrayVariable(BaseVariable):
     type = 'array_nest'
 
     def valid_value(self, value: list[T]) -> list[T]:
@@ -116,23 +133,23 @@ class NestedArrayObject(BaseVariable):
             raise TypeError(f"Value must be a list - {type(value)}:{value}")
         final_value = []
         for v in value:
-            if not isinstance(v, ArrayObject):
+            if not isinstance(v, list):
                 raise TypeError("All elements must be of type list")
-            final_value.append(v)
+            final_value.append(make_array(AnyVariable, v))
         return final_value
 
     def to_literal(self) -> str:
-        return "\n".join(["\n".join([item.to_literal() for item in row]) for row in self.value])
+        return "\n".join(["\n".join([str(item) for item in row.get_value()]) for row in self.value])
 
     def get_value(self) -> Any:
-        return [[item.get_value() for item in row] for row in self.value]
+        return [[item for item in row.get_value()] for row in self.value]
 
 
 @deprecated(
     reason="Using arbitrary-type values may cause unexpected errors; please switch to strongly-typed values.",
     category=RuntimeWarning
 )
-class AnyObject(BaseVariable):
+class AnyVariable(BaseVariable):
     type = 'any'
 
     def valid_value(self, value: Any) -> Any:
@@ -142,10 +159,10 @@ class AnyObject(BaseVariable):
         return str(self.value)
 
 
-def make_array(child_type: Type[T], value: list[Any]) -> ArrayObject[T]:
+def make_array(child_type: Type[T], value: list[Any]) -> ArrayVariable[T]:
-    """简化 ArrayObject 创建，不需要重复写类型"""
+    """简化 ArrayVariable 创建，不需要重复写类型"""
 
-    return ArrayObject(child_type, value)
+    return ArrayVariable(child_type, value)
 
 
 def create_variable_instance(var_type: VariableType, value: Any) -> T:
@@ -168,7 +185,9 @@ def create_variable_instance(var_type: VariableType, value: Any) -> T:
             return make_array(DictVariable, value)
         case VariableType.ARRAY_FILE:
             return make_array(FileVariable, value)
+        case VariableType.NESTED_ARRAY:
+            return NestedArrayVariable(value)
         case VariableType.ANY:
-            return AnyObject(value)
+            return AnyVariable(value)
         case _:
             raise TypeError(f"Invalid type - {var_type}")

api/app/services/workflow_service.py

@@ -580,6 +580,7 @@ class WorkflowService:
                 # "variables": result.get("variables"),
                 # "messages": result.get("messages"),
                 "output": result.get("output"),  # 最终输出（字符串）
+                "message": result.get("output"),  # 最终输出（字符串）
                 # "output_data": result.get("node_outputs", {}),  # 所有节点输出（详细数据）
                 "conversation_id": result.get("conversation_id"),  # 所有节点输出（详细数据）payload.,  # 会话 ID
                 "error_message": result.get("error"),