langchain_community.chat_message_histories.streamlit.StreamlitChatMessageHistory

class langchain_community.chat_message_histories.streamlit.StreamlitChatMessageHistory(key: str = 'langchain_messages')[source]

Chat message history that stores messages in Streamlit session state.

Parameters

key (str) – The key to use in Streamlit session state for storing messages.

Attributes

messages

Retrieve the current list of messages

Methods

__init__([key])

aadd_messages(messages)

Add a list of messages.

aclear()

Remove all messages from the store

add_ai_message(message)

Convenience method for adding an AI message string to the store.

add_message(message)

Add a message to the session memory

add_messages(messages)

Add a list of messages.

add_user_message(message)

Convenience method for adding a human message string to the store.

aget_messages()

Async version of getting messages.

clear()

Clear session memory

__init__(key: str = 'langchain_messages')[source]
Parameters

key (str) –

async aadd_messages(messages: Sequence[BaseMessage]) None

Add a list of messages.

Parameters

messages (Sequence[BaseMessage]) – A list of BaseMessage objects to store.

Return type

None

async aclear() None

Remove all messages from the store

Return type

None

add_ai_message(message: Union[AIMessage, str]) None

Convenience method for adding an AI message string to the store.

Please note that this is a convenience method. Code should favor the bulk add_messages interface instead to save on round-trips to the underlying persistence layer.

This method may be deprecated in a future release.

Parameters

message (Union[AIMessage, str]) – The AI message to add.

Return type

None

add_message(message: BaseMessage) None[source]

Add a message to the session memory

Parameters

message (BaseMessage) –

Return type

None

add_messages(messages: Sequence[BaseMessage]) None

Add a list of messages.

Implementations should over-ride this method to handle bulk addition of messages in an efficient manner to avoid unnecessary round-trips to the underlying store.

Parameters

messages (Sequence[BaseMessage]) – A list of BaseMessage objects to store.

Return type

None

add_user_message(message: Union[HumanMessage, str]) None

Convenience method for adding a human message string to the store.

Please note that this is a convenience method. Code should favor the bulk add_messages interface instead to save on round-trips to the underlying persistence layer.

This method may be deprecated in a future release.

Parameters

message (Union[HumanMessage, str]) – The human message to add

Return type

None

async aget_messages() List[BaseMessage]

Async version of getting messages.

Can over-ride this method to provide an efficient async implementation.

In general, fetching messages may involve IO to the underlying persistence layer.

Return type

List[BaseMessage]

clear() None[source]

Clear session memory

Return type

None

Examples using StreamlitChatMessageHistory