Fix input value handling in run_graph function

src/backend/langflow/api/v1/endpoints.py

@@ -1,5 +1,5 @@
 from http import HTTPStatus
-from typing import Annotated, Any, List, Optional, Union
+from typing import Annotated, List, Optional, Union
 
 import sqlalchemy as sa
 from fastapi import APIRouter, Body, Depends, HTTPException, UploadFile, status
@@ -14,8 +14,10 @@ from langflow.api.v1.schemas import (
     RunResponse,
     TaskStatusResponse,
     Tweaks,
+    UpdateCustomComponentRequest,
     UploadFileResponse,
 )
+from langflow.graph.schema import RunOutputs
 from langflow.interface.custom.custom_component import CustomComponent
 from langflow.interface.custom.directory_reader import DirectoryReader
 from langflow.interface.custom.utils import build_custom_component_template
@@ -24,12 +26,7 @@ from langflow.services.auth.utils import api_key_security, get_current_active_us
 from langflow.services.cache.utils import save_uploaded_file
 from langflow.services.database.models.flow import Flow
 from langflow.services.database.models.user.model import User
-from langflow.services.deps import (
+from langflow.services.deps import get_session, get_session_service, get_settings_service, get_task_service
-    get_session,
-    get_session_service,
-    get_settings_service,
-    get_task_service,
-)
 from langflow.services.session.service import SessionService
 from langflow.services.task.service import TaskService
 
@@ -56,8 +53,8 @@ def get_all(
 async def run_flow_with_caching(
     session: Annotated[Session, Depends(get_session)],
     flow_id: str,
-    inputs: Optional[List[InputValueRequest]] = None,
+    inputs: Optional[List[InputValueRequest]] = [],
-    outputs: Optional[List[str]] = None,
+    outputs: Optional[List[str]] = [],
     tweaks: Annotated[Optional[Tweaks], Body(embed=True)] = None,  # noqa: F821
     stream: Annotated[bool, Body(embed=True)] = False,  # noqa: F821
     session_id: Annotated[Union[None, str], Body(embed=True)] = None,  # noqa: F821
@@ -102,25 +99,20 @@ async def run_flow_with_caching(
     This endpoint facilitates complex flow executions with customized inputs, outputs, and configurations, catering to diverse application requirements.
     """
     try:
-        if inputs is not None:
-            input_values: list[dict[str, Union[str, list[str]]]] = [_input.model_dump() for _input in inputs]
-        else:
-            input_values = [{}]
-
         if outputs is None:
             outputs = []
 
         if session_id:
             session_data = await session_service.load_session(session_id, flow_id=flow_id)
             graph, artifacts = session_data if session_data else (None, None)
-            task_result: Any = None
+            task_result: List[RunOutputs] = []
             if not graph:
                 raise ValueError("Graph not found in the session")
             task_result, session_id = await run_graph(
                 graph=graph,
                 flow_id=flow_id,
                 session_id=session_id,
-                inputs=input_values,
+                inputs=inputs,
                 outputs=outputs,
                 artifacts=artifacts,
                 session_service=session_service,
@@ -142,7 +134,7 @@ async def run_flow_with_caching(
                 graph=graph_data,
                 flow_id=flow_id,
                 session_id=session_id,
-                inputs=input_values,
+                inputs=inputs,
                 outputs=outputs,
                 artifacts={},
                 session_service=session_service,
@@ -283,7 +275,7 @@ async def reload_custom_component(path: str, user: User = Depends(get_current_ac
 
 @router.post("/custom_component/update", status_code=HTTPStatus.OK)
 async def custom_component_update(
-    code_request: CustomComponentRequest,
+    code_request: UpdateCustomComponentRequest,
     user: User = Depends(get_current_active_user),
 ):
     """
@@ -300,15 +292,21 @@ async def custom_component_update(
         dict: The updated custom component node.
 
     """
-    component = CustomComponent(code=code_request.code)
+    try:
+        component = CustomComponent(code=code_request.code)
 
-    component_node, cc_instance = build_custom_component_template(
+        component_node, cc_instance = build_custom_component_template(
-        component,
+            component,
-        user_id=user.id,
+            user_id=user.id,
-    )
+        )
-    updated_build_config = cc_instance.update_build_config(
-        code_request.template, code_request.field_value, code_request.field_name
-    )
-    component_node["template"] = updated_build_config
 
-    return component_node
+        updated_build_config = cc_instance.update_build_config(
+            build_config=code_request.get_template(),
+            field_value=code_request.field_value,
+            field_name=code_request.field,
+        )
+        component_node["template"] = updated_build_config
+
+        return component_node
+    except Exception as exc:
+        raise HTTPException(status_code=400, detail=str(exc)) from exc

src/backend/langflow/api/v1/schemas.py

@@ -9,11 +9,11 @@ from pydantic import (
     ConfigDict,
     Field,
     RootModel,
-    field_serializer,
     field_validator,
     model_serializer,
 )
 
+from langflow.graph.schema import RunOutputs
 from langflow.schema import dotdict
 from langflow.services.database.models.api_key.model import ApiKeyRead
 from langflow.services.database.models.base import orjson_dumps
@@ -58,7 +58,7 @@ class ProcessResponse(BaseModel):
 class RunResponse(BaseModel):
     """Run response schema."""
 
-    outputs: Optional[List[Any]] = None
+    outputs: Optional[List[RunOutputs]] = []
     session_id: Optional[str] = None
 
     @model_serializer(mode="wrap")
@@ -173,14 +173,16 @@ class StreamData(BaseModel):
 class CustomComponentRequest(BaseModel):
     model_config = ConfigDict(arbitrary_types_allowed=True)
     code: str
-    field: Optional[str] = None
-    field_value: Optional[Any] = None
-    template: Optional[dict] = None
     frontend_node: Optional[dict] = None
 
-    @field_serializer("template")
+
-    def template_into_dotdict(v):
+class UpdateCustomComponentRequest(CustomComponentRequest):
-        return dotdict(v)
+    field: str
+    field_value: Optional[Union[str, int, float, bool, dict, list]] = None
+    template: dict
+
+    def get_template(self):
+        return dotdict(self.template)
 
 
 class CustomComponentResponseError(BaseModel):

src/backend/langflow/graph/graph/base.py

@@ -184,13 +184,13 @@ class Graph:
 
     async def run(
         self,
-        inputs: list[Dict[str, Union[str, list[str]]]],
+        inputs: list[Dict[str, str]],
+        inputs_components: Optional[list[list[str]]] = None,
         outputs: Optional[list[str]] = None,
         session_id: Optional[str] = None,
         stream: bool = False,
     ) -> List[RunOutputs]:
         """Runs the graph with the given inputs."""
-
         # inputs is {"message": "Hello, world!"}
         # we need to go through self.inputs and update the self._raw_params
         # of the vertices that are inputs
@@ -198,23 +198,14 @@ class Graph:
         vertex_outputs = []
         if not isinstance(inputs, list):
             inputs = [inputs]
-        for input_dict in inputs:
+        for run_inputs, components in zip(inputs, inputs_components or []):
-            components: Union[str, list[str]] = input_dict.get("components", [])
-
             if components and not isinstance(components, list):
                 raise ValueError(f"Invalid components value: {components}. Expected list")
             elif components is None:
                 components = []
 
-            if INPUT_FIELD_NAME not in input_dict:
+            if not isinstance(run_inputs.get(INPUT_FIELD_NAME, ""), str):
-                input_value = ""
+                raise ValueError(f"Invalid input value: {run_inputs.get(INPUT_FIELD_NAME)}. Expected string")
-            else:
-                _input_value = input_dict[INPUT_FIELD_NAME]
-                if isinstance(_input_value, str):
-                    input_value = _input_value
-                else:
-                    raise ValueError(f"Invalid input value: {input_value}. Expected string")
-            run_inputs = {INPUT_FIELD_NAME: input_value}
             run_outputs = await self._run(
                 inputs=run_inputs,
                 input_components=components,

src/backend/langflow/interface/custom/custom_component/custom_component.py

@@ -366,9 +366,10 @@ class CustomComponent(Component):
 
         if not flow_id:
             raise ValueError(f"Flow {flow_name} not found")
-
+        if isinstance(input_value, str):
+            input_value = [input_value]
         graph = await self.load_flow(flow_id, tweaks)
-        input_value_dict = [{"input_value": input_value}]
+        input_value_dict = [{"input_value": input_val} for input_val in input_value]
         return await graph.run(input_value_dict, stream=False)
 
     def list_flows(self, *, get_session: Optional[Callable] = None) -> List[Record]:

src/backend/langflow/interface/custom/utils.py

@@ -248,7 +248,7 @@ def run_build_config(
 
     try:
         if custom_component.code is None:
-            return {}
+            raise ValueError("Code is None")
         elif isinstance(custom_component.code, str):
             custom_class = eval_custom_component_code(custom_component.code)
         else:

src/backend/langflow/processing/process.py

@@ -11,13 +11,14 @@ from loguru import logger
 from pydantic import BaseModel
 
 from langflow.graph.graph.base import Graph
+from langflow.graph.schema import INPUT_FIELD_NAME, RunOutputs
 from langflow.graph.vertex.base import Vertex
 from langflow.interface.custom.custom_component import CustomComponent
 from langflow.interface.run import get_memory_key, update_memory_keys
 from langflow.services.session.service import SessionService
 
 if TYPE_CHECKING:
-    from langflow.api.v1.schemas import Tweaks
+    from langflow.api.v1.schemas import InputValueRequest, Tweaks
 
 
 def fix_memory_inputs(langchain_object):
@@ -200,31 +201,43 @@ async def run_graph(
     flow_id: str,
     stream: bool,
     session_id: Optional[str] = None,
-    inputs: Optional[list[dict[str, Union[List[str], str]]]] = None,
+    inputs: Optional[List["InputValueRequest"]] = None,
     outputs: Optional[List[str]] = None,
     artifacts: Optional[Dict[str, Any]] = None,
     session_service: Optional[SessionService] = None,
-):
+) -> tuple[List[RunOutputs], str]:
     """Run the graph and generate the result"""
+    inputs = inputs or []
     if isinstance(graph, dict):
         graph_data = graph
         graph = Graph.from_payload(graph, flow_id=flow_id)
     else:
         graph_data = graph._graph_data
     if session_id is None and session_service is not None:
-        session_id = session_service.generate_key(session_id=flow_id, data_graph=graph_data)
+        session_id_str = session_service.generate_key(session_id=flow_id, data_graph=graph_data)
-    if inputs is None:
+    elif session_id is not None:
-        inputs = [{}]
+        session_id_str = session_id
+    else:
+        raise ValueError("session_id or session_service must be provided")
+    components = []
+    inputs_list = []
+    for input_value_request in inputs:
+        if input_value_request.input_value is None:
+            logger.warning("InputValueRequest input_value cannot be None, defaulting to an empty string.")
+            input_value_request.input_value = ""
+        components.append(input_value_request.components or [])
+        inputs_list.append({INPUT_FIELD_NAME: input_value_request.input_value})
 
     run_outputs = await graph.run(
-        inputs,
+        inputs_list,
+        components,
         outputs or [],
         stream=stream,
-        session_id=session_id or "",
+        session_id=session_id_str or "",
     )
-    if session_id and session_service:
+    if session_id_str and session_service:
-        session_service.update_session(session_id, (graph, artifacts))
+        session_service.update_session(session_id_str, (graph, artifacts))
-    return run_outputs, session_id
+    return run_outputs, session_id_str
 
 
 def validate_input(