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)	Async add a list of messages.
`aclear`()	Async 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#

Async add a list of messages.

Parameters:: messages (Sequence[BaseMessage]) – A sequence of BaseMessage objects to store.
Return type:: None

async aclear() → None#

Async remove all messages from the store

Return type:: None

add_ai_message(message: 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 (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 sequence of BaseMessage objects to store.
Return type:: None

add_user_message(message: 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 (HumanMessage | str) – The human message to add to the store.
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

Streamlit