forked from phoenix-oss/llama-stack-mirror
ec4fc800cc
This is yet another of those large PRs (hopefully we will have less and less of them as things mature fast). This one introduces substantial improvements and some simplifications to the stack. Most important bits: * Agents reference implementation now has support for session / turn persistence. The default implementation uses sqlite but there's also support for using Redis. * We have re-architected the structure of the Stack APIs to allow for more flexible routing. The motivating use cases are: - routing model A to ollama and model B to a remote provider like Together - routing shield A to local impl while shield B to a remote provider like Bedrock - routing a vector memory bank to Weaviate while routing a keyvalue memory bank to Redis * Support for provider specific parameters to be passed from the clients. A client can pass data using `x_llamastack_provider_data` parameter which can be type-checked and provided to the Adapter implementations.
84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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import json
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import uuid
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from datetime import datetime
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from typing import List, Optional
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from llama_stack.apis.agents import * # noqa: F403
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from pydantic import BaseModel
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from llama_stack.providers.utils.kvstore import KVStore
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class AgentSessionInfo(BaseModel):
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session_id: str
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session_name: str
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memory_bank_id: Optional[str] = None
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started_at: datetime
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class AgentPersistence:
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def __init__(self, agent_id: str, kvstore: KVStore):
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self.agent_id = agent_id
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self.kvstore = kvstore
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async def create_session(self, name: str) -> str:
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session_id = str(uuid.uuid4())
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session_info = AgentSessionInfo(
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session_id=session_id,
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session_name=name,
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started_at=datetime.now(),
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)
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await self.kvstore.set(
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key=f"session:{self.agent_id}:{session_id}",
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value=session_info.json(),
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)
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return session_id
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async def get_session_info(self, session_id: str) -> Optional[AgentSessionInfo]:
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value = await self.kvstore.get(
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key=f"session:{self.agent_id}:{session_id}",
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)
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if not value:
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return None
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return AgentSessionInfo(**json.loads(value))
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async def add_memory_bank_to_session(self, session_id: str, bank_id: str):
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session_info = await self.get_session_info(session_id)
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if session_info is None:
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raise ValueError(f"Session {session_id} not found")
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session_info.memory_bank_id = bank_id
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await self.kvstore.set(
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key=f"session:{self.agent_id}:{session_id}",
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value=session_info.json(),
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)
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async def add_turn_to_session(self, session_id: str, turn: Turn):
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await self.kvstore.set(
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key=f"session:{self.agent_id}:{session_id}:{turn.turn_id}",
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value=turn.json(),
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)
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async def get_session_turns(self, session_id: str) -> List[Turn]:
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values = await self.kvstore.range(
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start_key=f"session:{self.agent_id}:{session_id}:",
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end_key=f"session:{self.agent_id}:{session_id}:\xff\xff\xff\xff",
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)
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turns = []
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for value in values:
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try:
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turn = Turn(**json.loads(value))
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turns.append(turn)
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except Exception as e:
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print(f"Error parsing turn: {e}")
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continue
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return turns
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