Redis

Redis (Remote Dictionary Server) is an open-source in-memory storage, used as a distributed, in-memory key–value database, cache and message broker, with optional durability. Because it holds all data in memory and because of its design, Redis offers low-latency reads and writes, making it particularly suitable for use cases that require a cache. Redis is the most popular NoSQL database, and one of the most popular databases overall.

This notebook goes over how to use Redis to store chat message history.

from langchain.memory import RedisChatMessageHistory

history = RedisChatMessageHistory("foo")

history.add_user_message("hi!")

history.add_ai_message("whats up?")

history.messages

[AIMessage(content='whats up?', additional_kwargs={}),
 HumanMessage(content='hi!', additional_kwargs={})]