Flow as tool Usage

[pavansandeep2910]

Discussed in https://github.com/langflow-ai/langflow/discussions/2891

^{Originally posted by pavansandeep2910 July 23, 2024} I cannot understand how to load files to see them in flow as tool component. can anyone help me direct to flow as tool usage?

[dosubot[bot]]

To load files and use them as tool components within the Langflow framework using the "flow as tool" feature, follow these steps:

1. Retrieve the Flow: Use the get_flow method to retrieve the flow by its name.
2. Build the Tool: Use the build method to construct the tool from the retrieved flow.

Here is an example of how you can do this:

from langflow.base.tools.flow_tool import FlowToolComponent

# Create an instance of FlowToolComponent
flow_tool_component = FlowToolComponent()

# Retrieve the flow by its name
flow_name = "example_flow_name"
flow_data = flow_tool_component.get_flow(flow_name)

if flow_data:
    # Build the tool using the retrieved flow data
    tool = await flow_tool_component.build(
        flow_name=flow_name,
        name="Example Tool",
        description="This is an example tool built from a flow.",
        return_direct=True
    )
    print("Tool built successfully:", tool)
else:
    print("Flow not found.")

In this example:

• Replace "example_flow_name" with the actual name of the flow you want to use.
• Customize the name, description, and return_direct parameters as needed.

This code will load the specified flow and use it to create a tool component within the Langflow framework. The FlowToolComponent class provides methods to list available flows, retrieve a specific flow by name, and build a tool from the flow data ^[1][2][3].

To continue talking to Dosu, mention @dosu.

[pavansandeep2910]

my flows are not being listed in flow as tool component @dosu

[dosubot[bot]]

If your flows are not being listed in the "Flow as Tool" component, it could be due to the list_flows method not returning any flow data. The get_flow_names method relies on list_flows to retrieve the flow data and extract the flow names.

Here is the relevant part of the code:

def get_flow_names(self) -> List[str]:
    flow_datas = self.list_flows()
    return [flow_data.data["name"] for flow_data in flow_datas]

If list_flows does not return any flow data, get_flow_names will return an empty list, and thus no flows will be listed.

To troubleshoot this issue, check the implementation of the list_flows method to ensure it is correctly retrieving the flow data. Here is the implementation of the list_flows method:

def list_flows(*, user_id: Optional[str] = None) -> List[Record]:
    if not user_id:
        raise ValueError("Session is invalid")
    try:
        with session_scope() as session:
            flows = session.exec(
                select(Flow).where(Flow.user_id == user_id).where(Flow.is_component == False)
            ).all()

            flows_records = [flow.to_record() for flow in flows]
            return flows_records
    except Exception as e:
        raise ValueError(f"Error listing flows: {e}")

Ensure that the user_id is valid and that the session is correctly established. The method filters flows based on the user_id and ensures that only non-component flows are listed. If there is an issue with the session or the user_id, the method will raise a ValueError ^[1][2][3].

Additionally, make sure that the session_scope function is working correctly. Here is its implementation:

@contextmanager
def session_scope():
    session = next(get_session())
    try:
        yield session
        session.commit()
    except:
        session.rollback()
        raise
    finally:
        session.close()

Potential issues with session_scope could include session initialization failure, commit failure, rollback failure, or session closure failure ^[4][5][6].

By ensuring that list_flows and session_scope are functioning correctly, you should be able to resolve the issue of flows not being listed in the "Flow as Tool" component.

To continue talking to Dosu, mention @dosu.

[pavansandeep2910]

list_flows method returning flows when used in my own custom component. but its not working in flow as tool component @dosu

[dosubot[bot]]

The issue with the list_flows method not working within the "Flow as Tool" component might be due to the update_build_config method not being called or not updating the build_config correctly. Ensure that the update_build_config method is invoked properly and that the flow_name field is being updated with the available flow names.

Here is the relevant part of the code that should be checked:

def update_build_config(self, build_config: dotdict, field_value: Any, field_name: str | None = None):
    logger.debug(f"Updating build config with field value {field_value} and field name {field_name}")
    if field_name == "flow_name":
        build_config["flow_name"]["options"] = self.get_flow_names()

    return build_config

Make sure that this method is being called with the correct parameters and that the build_config is being updated accordingly. If the flow_name field is not being updated with the available flow names, the list_flows method will not reflect the correct flows in the "Flow as Tool" component.

Additionally, ensure that the build_config method is returning the correct configuration:

def build_config(self):
    return {
        "flow_name": {
            "display_name": "Flow Name",
            "info": "The name of the flow to run.",
            "options": [],
            "real_time_refresh": True,
            "refresh_button": True,
        },
        "name": {
            "display_name": "Name",
            "description": "The name of the tool.",
        },
        "description": {
            "display_name": "Description",
            "description": "The description of the tool.",
        },
        "return_direct": {
            "display_name": "Return Direct",
            "description": "Return the result directly from the Tool.",
            "advanced": True,
        },
    }

Ensure that the options field in the flow_name configuration is being populated with the flow names by the update_build_config method.

Also, verify that the get_flow_names method is correctly retrieving the flow names:

def get_flow_names(self) -> List[str]:
    flow_datas = self.list_flows()
    return [flow_data.data["name"] for flow_data in flow_datas]

This method should return a list of flow names, which will be used to update the flow_name field in the build_config. If the list_flows method is working correctly in your custom component, ensure that the same logic is applied within the "Flow as Tool" component ^[1][2].

To continue talking to Dosu, mention @dosu.

[pavansandeep2910]

flow as a tool not working. please see this issue

[dosubot[bot]]

To address the issue with the "Flow as Tool" component not working, ensure the following:

1. Check list_flows Method: Verify that the list_flows method is correctly retrieving the flow data. Ensure that the user_id is valid and that the session is correctly established.

2. Verify update_build_config Method: Ensure that the update_build_config method is being called and updating the build_config correctly. Specifically, check that the flow_name field is being updated with the available flow names.

def update_build_config(self, build_config: dotdict, field_value: Any, field_name: str | None = None):
    logger.debug(f"Updating build config with field value {field_value} and field name {field_name}")
    if field_name == "flow_name":
        build_config["flow_name"]["options"] = self.get_flow_names()
    return build_config

3. Ensure build_config Method is Correct: Confirm that the build_config method is returning the correct configuration and that the options field in the flow_name configuration is being populated with the flow names.

def build_config(self):
    return {
        "flow_name": {
            "display_name": "Flow Name",
            "info": "The name of the flow to run.",
            "options": [],
            "real_time_refresh": True,
            "refresh_button": True,
        },
        "name": {
            "display_name": "Name",
            "description": "The name of the tool.",
        },
        "description": {
            "display_name": "Description",
            "description": "The description of the tool.",
        },
        "return_direct": {
            "display_name": "Return Direct",
            "description": "Return the result directly from the Tool.",
            "advanced": True,
        },
    }

4. Check get_flow_names Method: Ensure that the get_flow_names method is correctly retrieving the flow names.

def get_flow_names(self) -> List[str]:
    flow_datas = self.list_flows()
    return [flow_data.data["name"] for flow_data in flow_datas]

5. User Permissions: Ensure that the user_id is valid and that the user has the necessary permissions to list the flows. The list_flows method requires a valid user_id to function correctly ^[1][2].

By verifying these components, you should be able to resolve the issue with the "Flow as Tool" component not listing the flows.

To continue talking to Dosu, mention @dosu.

[YamonBot]

I am experiencing the same issue.

[pavansandeep2910]

Actually flows are being listed through list_flows, but some issue with showing them in dropdown I think

[lucaseduoli]

Hello! We're fixing this issue today. You can follow our progress through the issue #2972. If you have any more questions after the issue #2972 gets resolved, feel free to reopen this issue!