add_message

Example:

from langchain_redis import RedisChatMessageHistory
from langchain_core.messages import HumanMessage, AIMessage

history = RedisChatMessageHistory(
    session_id="user123",
    redis_url="redis://localhost:6379",
    ttl=3600  # optional: set TTL to 1 hour
)

# Add a human message
history.add_message(HumanMessage(content="Hello, AI!"))

# Add an AI message
history.add_message(
    AIMessage(content="Hello! How can I assist you today?")
)

# Verify messages were added
print(f"Number of messages: {len(history.messages)}")

Note:

• Each message is stored as a separate entry in Redis, associated with the current session_id.
• Messages are stored using RedisVL's JSON capabilities for efficient storage and retrieval.
• If a TTL (Time To Live) was specified when initializing the history, it will be applied to each message.
• The message's content, type, and any additional data (like timestamp) are stored.
• This method is thread-safe and can be used in concurrent environments.
• The Redis search index is automatically updated to include the new message, enabling future searches.
• Large message contents may impact performance and storage usage. Consider implementing size limits if dealing with potentially large messages.