Logic components in Langflow

Logic components provide functionalities for routing, conditional processing, and flow management.

Conditional router

This component routes an input message to a corresponding output based on text comparison.

The ConditionalRouterComponent routes messages based on text comparison. It evaluates a condition by comparing two text inputs using a specified operator and routes the message accordingly.

Inputs

Name	Type	Description
input_text	String	The primary text input for the operation.
match_text	String	The text input to compare against.
operator	Dropdown	The operator to apply for comparing the texts.
case_sensitive	Boolean	If true, the comparison will be case sensitive.
message	Message	The message to pass through either route.
max_iterations	Integer	The maximum number of iterations for the conditional router.
default_route	Dropdown	The default route to take when max iterations are reached.

Outputs

Name	Type	Description
true_result	Message	The output when the condition is true.
false_result	Message	The output when the condition is false.

Data conditional router

This component routes Data objects based on a condition applied to a specified key, including boolean validation.

This component is particularly useful in workflows that require conditional routing of complex data structures, enabling dynamic decision-making based on data content.

Inputs

Name	Type	Description
data_input	Data	The data object or list of data objects to process.
key_name	String	The name of the key in the data object to check.
operator	Dropdown	The operator to apply for comparing the values.
compare_value	String	The value to compare against (not used for boolean validator).

Outputs

Name	Type	Description
true_output	Data/List	Output when the condition is met.
false_output	Data/List	Output when the condition is not met.

Flow as Tool

This component constructs a tool from a function that runs a loaded flow.

Inputs

Name	Type	Description
flow_name	Dropdown	The name of the flow to run.
tool_name	String	The name of the tool.
tool_description	String	The description of the tool.
return_direct	Boolean	If true, returns the result directly from the tool.

Outputs

Name	Type	Description
api_build_tool	Tool	The constructed tool from the flow.

Listen

This component listens for a notification and retrieves its associated state.

Inputs

Name	Type	Description
name	String	The name of the notification to listen for.

Outputs

Name	Type	Description
output	Data	The state associated with the notification.

Notify

This component generates a notification for the Listen component to use.

Inputs

Name	Type	Description
name	String	The name of the notification.
data	Data	The data to store in the notification.
append	Boolean	If true, the record will be appended to the existing notification.

Outputs

Name	Type	Description
output	Data	The data stored in the notification.

Run flow

This component allows you to run a specified flow with given inputs and tweaks.

The RunFlowComponent executes a specified flow within a larger workflow. It provides the ability to run a flow with custom inputs and apply tweaks to modify its behavior.

Inputs

Name	Type	Description
input_value	String	The input value for the flow to process.
flow_name	Dropdown	The name of the flow to run.
tweaks	Nested Dict	Tweaks to apply to the flow.

Outputs

Name	Type	Description
run_outputs	List[Data]	The results generated from running the flow.

Sub Flow

This SubFlowComponent generates a component from a flow with all of its inputs and outputs.

This component can integrate entire flows as components within a larger workflow. It dynamically generates inputs based on the selected flow and executes the flow with provided parameters.

Inputs

Name	Type	Description
flow_name	Dropdown	The name of the flow to run.

Outputs

Name	Type	Description
flow_outputs	List[Data]	The outputs generated from the flow.