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聊天存储

聊天存储库作为存储聊天历史的集中式接口。与其他存储格式相比,聊天历史具有独特性,因为消息的顺序对于维持整体对话至关重要。

聊天存储可以通过键(如 user_ids 或其他唯一可识别字符串)来组织聊天消息序列,并处理 deleteinsertget 操作。

最基本的聊天存储是 SimpleChatStore,它在内存中存储消息,可以保存到磁盘或从磁盘加载,也可以序列化并存储在其他地方。

通常,您会实例化一个聊天存储并将其提供给记忆模块。如果未提供,使用聊天存储的记忆模块将默认使用 SimpleChatStore

from llama_index.core.storage.chat_store import SimpleChatStore
from llama_index.core.memory import ChatMemoryBuffer
chat_store = SimpleChatStore()
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

一旦创建了记忆,你可以将其包含在智能体或聊天引擎中:

agent = FunctionAgent(tools=tools, llm=llm)
await agent.run("...", memory=memory)
# OR
chat_engine = index.as_chat_engine(memory=memory)

要保存聊天记录供以后使用,您可以选择从磁盘保存/加载

chat_store.persist(persist_path="chat_store.json")
loaded_chat_store = SimpleChatStore.from_persist_path(
persist_path="chat_store.json"
)

或者您可以在过程中将字符串转换或保存到其他地方

chat_store_string = chat_store.json()
loaded_chat_store = SimpleChatStore.parse_raw(chat_store_string)

使用UpstashChatStore,您可以通过Upstash Redis远程存储聊天记录,该服务提供无服务器Redis解决方案,非常适合需要可扩展且高效聊天存储的应用程序。 此聊天存储支持同步和异步操作。

Terminal window
pip install llama-index-storage-chat-store-upstash
from llama_index.storage.chat_store.upstash import UpstashChatStore
from llama_index.core.memory import ChatMemoryBuffer
chat_store = UpstashChatStore(
redis_url="YOUR_UPSTASH_REDIS_URL",
redis_token="YOUR_UPSTASH_REDIS_TOKEN",
ttl=300, # Optional: Time to live in seconds
)
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

UpstashChatStore 支持同步和异步操作。以下是使用异步方法的示例:

import asyncio
from llama_index.core.llms import ChatMessage
async def main():
# Add messages
messages = [
ChatMessage(content="Hello", role="user"),
ChatMessage(content="Hi there!", role="assistant"),
]
await chat_store.async_set_messages("conversation1", messages)
# Retrieve messages
retrieved_messages = await chat_store.async_get_messages("conversation1")
print(retrieved_messages)
# Delete last message
deleted_message = await chat_store.async_delete_last_message(
"conversation1"
)
print(f"Deleted message: {deleted_message}")
asyncio.run(main())

使用 RedisChatStore,您可以远程存储聊天记录,无需担心手动保存和加载聊天历史。

from llama_index.storage.chat_store.redis import RedisChatStore
from llama_index.core.memory import ChatMemoryBuffer
chat_store = RedisChatStore(redis_url="redis://localhost:6379", ttl=300)
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

使用 AzureChatStore,您可以将聊天记录远程存储在 Azure 表存储或 CosmosDB 中,无需担心手动保存和加载聊天记录。

pip install llama-index
pip install llama-index-llms-azure-openai
pip install llama-index-storage-chat-store-azure
from llama_index.core.chat_engine import SimpleChatEngine
from llama_index.core.memory import ChatMemoryBuffer
from llama_index.storage.chat_store.azure import AzureChatStore
chat_store = AzureChatStore.from_account_and_key(
account_name="",
account_key="",
chat_table_name="ChatUser",
)
memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="conversation1",
)
chat_engine = SimpleChatEngine(
memory=memory, llm=Settings.llm, prefix_messages=[]
)
response = chat_engine.chat("Hello.")

使用 DynamoDBChatStore,您可以将聊天记录存储在 AWS DynamoDB 中。

Terminal window
pip install llama-index-storage-chat-store-dynamodb

确保您已创建一个具有适当架构的 DynamoDB 表。默认情况下,示例如下:

import boto3
# Get the service resource.
dynamodb = boto3.resource("dynamodb")
# Create the DynamoDB table.
table = dynamodb.create_table(
TableName="EXAMPLE_TABLE",
KeySchema=[{"AttributeName": "SessionId", "KeyType": "HASH"}],
AttributeDefinitions=[
{"AttributeName": "SessionId", "AttributeType": "S"}
],
BillingMode="PAY_PER_REQUEST",
)

然后您可以使用 DynamoDBChatStore 类来持久化存储和检索聊天记录:

import os
from llama_index.core.llms import ChatMessage, MessageRole
from llama_index.storage.chat_store.dynamodb.base import DynamoDBChatStore
# Initialize DynamoDB chat store
chat_store = DynamoDBChatStore(
table_name="EXAMPLE_TABLE", profile_name=os.getenv("AWS_PROFILE")
)
# A chat history, which doesn't exist yet, returns an empty array.
print(chat_store.get_messages("123"))
# >>> []
# Initializing a chat history with a key of "SessionID = 123"
messages = [
ChatMessage(role=MessageRole.USER, content="Who are you?"),
ChatMessage(
role=MessageRole.ASSISTANT, content="I am your helpful AI assistant."
),
]
chat_store.set_messages(key="123", messages=messages)
print(chat_store.get_messages("123"))
# >>> [ChatMessage(role=<MessageRole.USER: 'user'>, content='Who are you?', additional_kwargs={}),
# ChatMessage(role=<MessageRole.ASSISTANT: 'assistant'>, content='I am your helpful AI assistant.', additional_kwargs={})]]
# Appending a message to an existing chat history
message = ChatMessage(role=MessageRole.USER, content="What can you do?")
chat_store.add_message(key="123", message=message)
print(chat_store.get_messages("123"))
# >>> [ChatMessage(role=<MessageRole.USER: 'user'>, content='Who are you?', additional_kwargs={}),
# ChatMessage(role=<MessageRole.ASSISTANT: 'assistant'>, content='I am your helpful AI assistant.', additional_kwargs={})],
# ChatMessage(role=<MessageRole.USER: 'user'>, content='What can you do?', additional_kwargs={})]

使用 PostgresChatStore,您可以远程存储聊天记录,无需担心手动保存和加载聊天历史。

from llama_index.storage.chat_store.postgres import PostgresChatStore
from llama_index.core.memory import ChatMemoryBuffer
chat_store = PostgresChatStore.from_uri(
uri="postgresql+asyncpg://postgres:password@127.0.0.1:5432/database",
)
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

使用 TablestoreChatStore,您可以将聊天记录远程存储,无需担心手动保存和加载聊天记录。

Terminal window
pip install llama-index-storage-chat-store-tablestore
from llama_index.storage.chat_store.tablestore import TablestoreChatStore
from llama_index.core.memory import ChatMemoryBuffer
# 1. create tablestore vector store
chat_store = TablestoreChatStore(
endpoint="<end_point>",
instance_name="<instance_name>",
access_key_id="<access_key_id>",
access_key_secret="<access_key_secret>",
)
# You need to create a table for the first use
chat_store.create_table_if_not_exist()
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

使用 AlloyDBChatStore,您可以将聊天记录存储在AlloyDB中,无需担心手动保存和加载聊天记录。

本教程演示同步接口。所有同步方法都有对应的异步方法。

Terminal window
pip install llama-index
pip install llama-index-alloydb-pg
pip install llama-index-llms-vertex
from llama_index.core.chat_engine import SimpleChatEngine
from llama_index.core.memory import ChatMemoryBuffer
from llama_index_alloydb_pg import AlloyDBChatStore, AlloyDBEngine
from llama_index.llms.vertex import Vertex
import asyncio
# Replace with your own AlloyDB info
engine = AlloyDBEngine.from_instance(
project_id=PROJECT_ID,
region=REGION,
cluster=CLUSTER,
instance=INSTANCE,
database=DATABASE,
user=USER,
password=PASSWORD,
)
engine.init_chat_store_table(table_name=TABLE_NAME)
chat_store = AlloyDBChatStore.create_sync(
engine=engine,
table_name=TABLE_NAME,
)
memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)
llm = Vertex(model="gemini-1.5-flash-002", project=PROJECT_ID)
chat_engine = SimpleChatEngine(memory=memory, llm=llm, prefix_messages=[])
response = chat_engine.chat("Hello.")
print(response)

Google Cloud SQL for PostgreSQL 聊天存储

Section titled “Google Cloud SQL for PostgreSQL ChatStore”

使用 PostgresChatStore,您可以将聊天记录存储在 Cloud SQL for Postgres 中,无需担心手动保存和加载聊天记录。

本教程演示同步接口。所有同步方法都有对应的异步方法。

Terminal window
pip install llama-index
pip install llama-index-cloud-sql-pg
pip install llama-index-llms-vertex
from llama_index.core.chat_engine import SimpleChatEngine
from llama_index.core.memory import ChatMemoryBuffer
from llama_index_cloud_sql_pg import PostgresChatStore, PostgresEngine
from llama_index.llms.vertex import Vertex
import asyncio
# Replace with your own Cloud SQL info
engine = PostgresEngine.from_instance(
project_id=PROJECT_ID,
region=REGION,
instance=INSTANCE,
database=DATABASE,
user=USER,
password=PASSWORD,
)
engine.init_chat_store_table(table_name=TABLE_NAME)
chat_store = PostgresChatStore.create_sync(
engine=engine,
table_name=TABLE_NAME,
)
memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)
llm = Vertex(model="gemini-1.5-flash-002", project=PROJECT_ID)
chat_engine = SimpleChatEngine(memory=memory, llm=llm, prefix_messages=[])
response = chat_engine.chat("Hello.")
print(response)

使用 YugabyteDBChatStore,您可以远程存储聊天记录,无需担心手动保存和加载聊天历史。

在使用此集成之前,您需要运行一个YugabyteDB实例。您可以通过遵循YugaByteDB快速入门指南来设置本地YugabyteDB实例。

Terminal window
pip install llama-index-storage-chat-store-yugabytedb
from llama_index.storage.chat_store.yugabytedb import YugabyteDBChatStore
from llama_index.core.memory import ChatMemoryBuffer
chat_store = YugabyteDBChatStore.from_uri(
uri="yugabytedb+psycopg2://yugabyte:password@127.0.0.1:5433/yugabyte?load_balance=true",
)
chat_memory = ChatMemoryBuffer.from_defaults(
token_limit=3000,
chat_store=chat_store,
chat_store_key="user1",
)

传递给 YugabyteDBChatStore.from_uri() 的连接字符串支持多种参数,可用于配置与您的 YugabyteDB 集群的连接。 您可以在 YugabyteDB psycopg2 驱动程序文档 中找到支持的参数完整列表。

YugabyteDB 特定参数包括:

  • load_balance: 启用/禁用负载均衡(默认值:false)
  • topology_keys: 指定用于连接路由的首选节点
  • yb_servers_refresh_interval: 刷新可用服务器列表的时间间隔(以秒为单位)
  • fallback_to_topology_keys_only: 是否仅连接到拓扑键中指定的节点
  • failed_host_ttl_seconds: 在尝试连接失败节点前等待的时间(以秒为单位)