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| import asyncio
import json
import httpx
from typing import Optional, Dict, Any, List, AsyncIterator, Union
from dataclasses import dataclass
from datetime import datetime
@dataclass
class Assistant:
"""智能体助手"""
id: str
name: str
config: Dict[str, Any]
created_at: datetime
client: 'LangGraphClient'
async def update_config(self, config: Dict[str, Any]) -> 'Assistant':
"""更新助手配置"""
return await self.client.update_assistant(self.id, config)
async def delete(self) -> None:
"""删除助手"""
await self.client.delete_assistant(self.id)
async def invoke(
self,
input: Dict[str, Any],
*,
thread_id: Optional[str] = None,
config: Optional[Dict[str, Any]] = None,
) -> Dict[str, Any]:
"""调用助手"""
return await self.client.invoke_assistant(
self.id, input, thread_id=thread_id, config=config
)
async def stream(
self,
input: Dict[str, Any],
*,
thread_id: Optional[str] = None,
config: Optional[Dict[str, Any]] = None,
) -> AsyncIterator[Dict[str, Any]]:
"""流式调用助手"""
async for event in self.client.stream_assistant(
self.id, input, thread_id=thread_id, config=config
):
yield event
@dataclass
class Thread:
"""对话线程"""
id: str
metadata: Dict[str, Any]
created_at: datetime
client: 'LangGraphClient'
async def get_messages(self) -> List[Dict[str, Any]]:
"""获取消息历史"""
return await self.client.get_thread_messages(self.id)
async def add_message(self, content: str, role: str = "user") -> Dict[str, Any]:
"""添加消息"""
return await self.client.add_thread_message(self.id, content, role)
async def get_state(self) -> Dict[str, Any]:
"""获取线程状态"""
return await self.client.get_thread_state(self.id)
async def update_state(self, values: Dict[str, Any]) -> Dict[str, Any]:
"""更新线程状态"""
return await self.client.update_thread_state(self.id, values)
class LangGraphClient:
"""LangGraph平台API客户端"""
def __init__(
self,
api_key: Optional[str] = None,
base_url: str = "https://api.langgraph.com",
timeout: float = 60.0,
):
self.api_key = api_key or self._get_api_key()
self.base_url = base_url.rstrip("/")
self.timeout = timeout
self._client = httpx.AsyncClient(
timeout=timeout,
headers={
"Authorization": f"Bearer {self.api_key}",
"User-Agent": "langgraph-sdk-python/0.1.0",
}
)
def _get_api_key(self) -> str:
"""获取API密钥"""
import os
api_key = os.environ.get("LANGGRAPH_API_KEY")
if not api_key:
raise ValueError("未设置LANGGRAPH_API_KEY环境变量")
return api_key
async def __aenter__(self):
return self
async def __aexit__(self, exc_type, exc_val, exc_tb):
await self._client.aclose()
# 助手管理
async def get_assistants(self) -> List[Assistant]:
"""获取助手列表"""
response = await self._client.get(f"{self.base_url}/assistants")
response.raise_for_status()
data = response.json()
return [
Assistant(
id=item["id"],
name=item["name"],
config=item["config"],
created_at=datetime.fromisoformat(item["created_at"]),
client=self,
)
for item in data["assistants"]
]
async def create_assistant(
self,
name: str,
config: Dict[str, Any],
metadata: Optional[Dict[str, Any]] = None,
) -> Assistant:
"""创建新助手"""
payload = {
"name": name,
"config": config,
"metadata": metadata or {},
}
response = await self._client.post(
f"{self.base_url}/assistants",
json=payload,
)
response.raise_for_status()
data = response.json()
return Assistant(
id=data["id"],
name=data["name"],
config=data["config"],
created_at=datetime.fromisoformat(data["created_at"]),
client=self,
)
async def get_assistant(self, assistant_id: str) -> Assistant:
"""获取指定助手"""
response = await self._client.get(f"{self.base_url}/assistants/{assistant_id}")
response.raise_for_status()
data = response.json()
return Assistant(
id=data["id"],
name=data["name"],
config=data["config"],
created_at=datetime.fromisoformat(data["created_at"]),
client=self,
)
async def update_assistant(
self,
assistant_id: str,
config: Dict[str, Any]
) -> Assistant:
"""更新助手配置"""
response = await self._client.patch(
f"{self.base_url}/assistants/{assistant_id}",
json={"config": config},
)
response.raise_for_status()
data = response.json()
return Assistant(
id=data["id"],
name=data["name"],
config=data["config"],
created_at=datetime.fromisoformat(data["created_at"]),
client=self,
)
async def delete_assistant(self, assistant_id: str) -> None:
"""删除助手"""
response = await self._client.delete(f"{self.base_url}/assistants/{assistant_id}")
response.raise_for_status()
# 线程管理
async def create_thread(
self,
metadata: Optional[Dict[str, Any]] = None
) -> Thread:
"""创建新线程"""
payload = {"metadata": metadata or {}}
response = await self._client.post(f"{self.base_url}/threads", json=payload)
response.raise_for_status()
data = response.json()
return Thread(
id=data["id"],
metadata=data["metadata"],
created_at=datetime.fromisoformat(data["created_at"]),
client=self,
)
async def get_thread(self, thread_id: str) -> Thread:
"""获取指定线程"""
response = await self._client.get(f"{self.base_url}/threads/{thread_id}")
response.raise_for_status()
data = response.json()
return Thread(
id=data["id"],
metadata=data["metadata"],
created_at=datetime.fromisoformat(data["created_at"]),
client=self,
)
# 执行管理
async def invoke_assistant(
self,
assistant_id: str,
input: Dict[str, Any],
*,
thread_id: Optional[str] = None,
config: Optional[Dict[str, Any]] = None,
) -> Dict[str, Any]:
"""同步调用助手"""
payload = {
"input": input,
"config": config or {},
}
if thread_id:
payload["thread_id"] = thread_id
response = await self._client.post(
f"{self.base_url}/assistants/{assistant_id}/invoke",
json=payload,
)
response.raise_for_status()
return response.json()
async def stream_assistant(
self,
assistant_id: str,
input: Dict[str, Any],
*,
thread_id: Optional[str] = None,
config: Optional[Dict[str, Any]] = None,
) -> AsyncIterator[Dict[str, Any]]:
"""流式调用助手"""
payload = {
"input": input,
"config": config or {},
}
if thread_id:
payload["thread_id"] = thread_id
async with self._client.stream(
"POST",
f"{self.base_url}/assistants/{assistant_id}/stream",
json=payload,
) as response:
response.raise_for_status()
async for line in response.aiter_lines():
if line.startswith("data: "):
try:
data = json.loads(line[6:])
yield data
except json.JSONDecodeError:
continue
# 状态管理
async def get_thread_state(self, thread_id: str) -> Dict[str, Any]:
"""获取线程状态"""
response = await self._client.get(f"{self.base_url}/threads/{thread_id}/state")
response.raise_for_status()
return response.json()
async def update_thread_state(
self,
thread_id: str,
values: Dict[str, Any]
) -> Dict[str, Any]:
"""更新线程状态"""
response = await self._client.patch(
f"{self.base_url}/threads/{thread_id}/state",
json={"values": values},
)
response.raise_for_status()
return response.json()
# 使用示例
async def main():
"""SDK使用示例"""
async with LangGraphClient() as client:
# 创建助手
assistant = await client.create_assistant(
name="我的助手",
config={
"model": "gpt-4",
"tools": ["web_search", "calculator"],
"prompt": "你是一个有用的助手",
}
)
print(f"创建助手: {assistant.name} ({assistant.id})")
# 创建对话线程
thread = await client.create_thread(
metadata={"user_id": "user123"}
)
print(f"创建线程: {thread.id}")
# 调用助手
result = await assistant.invoke(
{"messages": [{"role": "user", "content": "你好！"}]},
thread_id=thread.id,
)
print(f"助手回复: {result}")
# 流式调用
print("流式回复:")
async for event in assistant.stream(
{"messages": [{"role": "user", "content": "今天天气怎么样？"}]},
thread_id=thread.id,
):
if event.get("type") == "message":
print(event["content"], end="", flush=True)
print("\n")
if __name__ == "__main__":
asyncio.run(main())
|