import base64
import hashlib
import hmac
import json
import logging
import queue
import threading
from datetime import datetime
from queue import Queue
from time import mktime
from typing import Any, Dict, Generator, Iterator, List, Mapping, Optional, Type, cast
from urllib.parse import urlencode, urlparse, urlunparse
from wsgiref.handlers import format_date_time
from langchain_core.callbacks import (
CallbackManagerForLLMRun,
)
from langchain_core.language_models.chat_models import (
BaseChatModel,
generate_from_stream,
)
from langchain_core.messages import (
AIMessage,
AIMessageChunk,
BaseMessage,
BaseMessageChunk,
ChatMessage,
ChatMessageChunk,
FunctionMessageChunk,
HumanMessage,
HumanMessageChunk,
SystemMessage,
ToolMessageChunk,
)
from langchain_core.output_parsers.openai_tools import (
make_invalid_tool_call,
parse_tool_call,
)
from langchain_core.outputs import (
ChatGeneration,
ChatGenerationChunk,
ChatResult,
)
from langchain_core.utils import (
get_from_dict_or_env,
get_pydantic_field_names,
)
from langchain_core.utils.pydantic import get_fields
from pydantic import ConfigDict, Field, model_validator
logger = logging.getLogger(__name__)
SPARK_API_URL = "wss://spark-api.xf-yun.com/v3.5/chat"
SPARK_LLM_DOMAIN = "generalv3.5"
[docs]
def convert_message_to_dict(message: BaseMessage) -> dict:
message_dict: Dict[str, Any]
if isinstance(message, ChatMessage):
message_dict = {"role": "user", "content": message.content}
elif isinstance(message, HumanMessage):
message_dict = {"role": "user", "content": message.content}
elif isinstance(message, AIMessage):
message_dict = {"role": "assistant", "content": message.content}
if "function_call" in message.additional_kwargs:
message_dict["function_call"] = message.additional_kwargs["function_call"]
# If function call only, content is None not empty string
if message_dict["content"] == "":
message_dict["content"] = None
if "tool_calls" in message.additional_kwargs:
message_dict["tool_calls"] = message.additional_kwargs["tool_calls"]
# If tool calls only, content is None not empty string
if message_dict["content"] == "":
message_dict["content"] = None
elif isinstance(message, SystemMessage):
message_dict = {"role": "system", "content": message.content}
else:
raise ValueError(f"Got unknown type {message}")
return message_dict
[docs]
def convert_dict_to_message(_dict: Mapping[str, Any]) -> BaseMessage:
msg_role = _dict["role"]
msg_content = _dict["content"]
if msg_role == "user":
return HumanMessage(content=msg_content)
elif msg_role == "assistant":
invalid_tool_calls = []
additional_kwargs: Dict = {}
if function_call := _dict.get("function_call"):
additional_kwargs["function_call"] = dict(function_call)
tool_calls = []
if raw_tool_calls := _dict.get("tool_calls"):
additional_kwargs["tool_calls"] = raw_tool_calls
for raw_tool_call in _dict["tool_calls"]:
try:
tool_calls.append(parse_tool_call(raw_tool_call, return_id=True))
except Exception as e:
invalid_tool_calls.append(
make_invalid_tool_call(raw_tool_call, str(e))
)
else:
additional_kwargs = {}
content = msg_content or ""
return AIMessage(
content=content,
additional_kwargs=additional_kwargs,
tool_calls=tool_calls,
invalid_tool_calls=invalid_tool_calls,
)
elif msg_role == "system":
return SystemMessage(content=msg_content)
else:
return ChatMessage(content=msg_content, role=msg_role)
def _convert_delta_to_message_chunk(
_dict: Mapping[str, Any], default_class: Type[BaseMessageChunk]
) -> BaseMessageChunk:
msg_role = cast(str, _dict.get("role"))
msg_content = cast(str, _dict.get("content") or "")
additional_kwargs: Dict = {}
if _dict.get("function_call"):
function_call = dict(_dict["function_call"])
if "name" in function_call and function_call["name"] is None:
function_call["name"] = ""
additional_kwargs["function_call"] = function_call
if _dict.get("tool_calls"):
additional_kwargs["tool_calls"] = _dict["tool_calls"]
if msg_role == "user" or default_class == HumanMessageChunk:
return HumanMessageChunk(content=msg_content)
elif msg_role == "assistant" or default_class == AIMessageChunk:
return AIMessageChunk(content=msg_content, additional_kwargs=additional_kwargs)
elif msg_role == "function" or default_class == FunctionMessageChunk:
return FunctionMessageChunk(content=msg_content, name=_dict["name"])
elif msg_role == "tool" or default_class == ToolMessageChunk:
return ToolMessageChunk(content=msg_content, tool_call_id=_dict["tool_call_id"])
elif msg_role or default_class == ChatMessageChunk:
return ChatMessageChunk(content=msg_content, role=msg_role)
else:
return default_class(content=msg_content) # type: ignore[call-arg]
[docs]
class ChatSparkLLM(BaseChatModel):
"""IFlyTek Spark chat model integration.
Setup:
To use, you should have the environment variable``IFLYTEK_SPARK_API_KEY``,
``IFLYTEK_SPARK_API_SECRET`` and ``IFLYTEK_SPARK_APP_ID``.
Key init args — completion params:
model: Optional[str]
Name of IFLYTEK SPARK model to use.
temperature: Optional[float]
Sampling temperature.
top_k: Optional[float]
What search sampling control to use.
streaming: Optional[bool]
Whether to stream the results or not.
Key init args — client params:
api_key: Optional[str]
IFLYTEK SPARK API KEY. If not passed in will be read from env var IFLYTEK_SPARK_API_KEY.
api_secret: Optional[str]
IFLYTEK SPARK API SECRET. If not passed in will be read from env var IFLYTEK_SPARK_API_SECRET.
api_url: Optional[str]
Base URL for API requests.
timeout: Optional[int]
Timeout for requests.
See full list of supported init args and their descriptions in the params section.
Instantiate:
.. code-block:: python
from langchain_community.chat_models import ChatSparkLLM
chat = ChatSparkLLM(
api_key="your-api-key",
api_secret="your-api-secret",
model='Spark4.0 Ultra',
# temperature=...,
# other params...
)
Invoke:
.. code-block:: python
messages = [
("system", "你是一名专业的翻译家，可以将用户的中文翻译为英文。"),
("human", "我喜欢编程。"),
]
chat.invoke(messages)
.. code-block:: python
AIMessage(
content='I like programming.',
response_metadata={
'token_usage': {
'question_tokens': 3,
'prompt_tokens': 16,
'completion_tokens': 4,
'total_tokens': 20
}
},
id='run-af8b3531-7bf7-47f0-bfe8-9262cb2a9d47-0'
)
Stream:
.. code-block:: python
for chunk in chat.stream(messages):
print(chunk)
.. code-block:: python
content='I' id='run-fdbb57c2-2d32-4516-b894-6c5a67605d83'
content=' like programming' id='run-fdbb57c2-2d32-4516-b894-6c5a67605d83'
content='.' id='run-fdbb57c2-2d32-4516-b894-6c5a67605d83'
.. code-block:: python
stream = chat.stream(messages)
full = next(stream)
for chunk in stream:
full += chunk
full
.. code-block:: python
AIMessageChunk(
content='I like programming.',
id='run-aca2fa82-c2e4-4835-b7e2-865ddd3c46cb'
)
Response metadata
.. code-block:: python
ai_msg = chat.invoke(messages)
ai_msg.response_metadata
.. code-block:: python
{
'token_usage': {
'question_tokens': 3,
'prompt_tokens': 16,
'completion_tokens': 4,
'total_tokens': 20
}
}
""" # noqa: E501
@classmethod
def is_lc_serializable(cls) -> bool:
"""Return whether this model can be serialized by Langchain."""
return False
@property
def lc_secrets(self) -> Dict[str, str]:
return {
"spark_app_id": "IFLYTEK_SPARK_APP_ID",
"spark_api_key": "IFLYTEK_SPARK_API_KEY",
"spark_api_secret": "IFLYTEK_SPARK_API_SECRET",
"spark_api_url": "IFLYTEK_SPARK_API_URL",
"spark_llm_domain": "IFLYTEK_SPARK_LLM_DOMAIN",
}
client: Any = None #: :meta private:
spark_app_id: Optional[str] = Field(default=None, alias="app_id")
"""Automatically inferred from env var `IFLYTEK_SPARK_APP_ID`
if not provided."""
spark_api_key: Optional[str] = Field(default=None, alias="api_key")
"""Automatically inferred from env var `IFLYTEK_SPARK_API_KEY`
if not provided."""
spark_api_secret: Optional[str] = Field(default=None, alias="api_secret")
"""Automatically inferred from env var `IFLYTEK_SPARK_API_SECRET`
if not provided."""
spark_api_url: Optional[str] = Field(default=None, alias="api_url")
"""Base URL path for API requests, leave blank if not using a proxy or service
emulator."""
spark_llm_domain: Optional[str] = Field(default=None, alias="model")
"""Model name to use."""
spark_user_id: str = "lc_user"
streaming: bool = False
"""Whether to stream the results or not."""
request_timeout: int = Field(30, alias="timeout")
"""request timeout for chat http requests"""
temperature: float = Field(default=0.5)
"""What sampling temperature to use."""
top_k: int = 4
"""What search sampling control to use."""
model_kwargs: Dict[str, Any] = Field(default_factory=dict)
"""Holds any model parameters valid for API call not explicitly specified."""
model_config = ConfigDict(
populate_by_name=True,
)
@model_validator(mode="before")
@classmethod
def validate_environment(cls, values: Dict) -> Any:
values["spark_app_id"] = get_from_dict_or_env(
values,
["spark_app_id", "app_id"],
"IFLYTEK_SPARK_APP_ID",
)
values["spark_api_key"] = get_from_dict_or_env(
values,
["spark_api_key", "api_key"],
"IFLYTEK_SPARK_API_KEY",
)
values["spark_api_secret"] = get_from_dict_or_env(
values,
["spark_api_secret", "api_secret"],
"IFLYTEK_SPARK_API_SECRET",
)
values["spark_api_url"] = get_from_dict_or_env(
values,
"spark_api_url",
"IFLYTEK_SPARK_API_URL",
SPARK_API_URL,
)
values["spark_llm_domain"] = get_from_dict_or_env(
values,
"spark_llm_domain",
"IFLYTEK_SPARK_LLM_DOMAIN",
SPARK_LLM_DOMAIN,
)
# put extra params into model_kwargs
default_values = {
name: field.default
for name, field in get_fields(cls).items()
if field.default is not None
}
values["model_kwargs"]["temperature"] = default_values.get("temperature")
values["model_kwargs"]["top_k"] = default_values.get("top_k")
values["client"] = _SparkLLMClient(
app_id=values["spark_app_id"],
api_key=values["spark_api_key"],
api_secret=values["spark_api_secret"],
api_url=values["spark_api_url"],
spark_domain=values["spark_llm_domain"],
model_kwargs=values["model_kwargs"],
)
return values
# When using Pydantic V2
# The execution order of multiple @model_validator decorators is opposite to
# their declaration order. https://github.com/pydantic/pydantic/discussions/7434
@model_validator(mode="before")
@classmethod
def build_extra(cls, values: Dict[str, Any]) -> Any:
"""Build extra kwargs from additional params that were passed in."""
all_required_field_names = get_pydantic_field_names(cls)
extra = values.get("model_kwargs", {})
for field_name in list(values):
if field_name in extra:
raise ValueError(f"Found {field_name} supplied twice.")
if field_name not in all_required_field_names:
logger.warning(
f"""WARNING! {field_name} is not default parameter.
{field_name} was transferred to model_kwargs.
Please confirm that {field_name} is what you intended."""
)
extra[field_name] = values.pop(field_name)
invalid_model_kwargs = all_required_field_names.intersection(extra.keys())
if invalid_model_kwargs:
raise ValueError(
f"Parameters {invalid_model_kwargs} should be specified explicitly. "
f"Instead they were passed in as part of `model_kwargs` parameter."
)
values["model_kwargs"] = extra
return values
def _stream(
self,
messages: List[BaseMessage],
stop: Optional[List[str]] = None,
run_manager: Optional[CallbackManagerForLLMRun] = None,
**kwargs: Any,
) -> Iterator[ChatGenerationChunk]:
default_chunk_class = AIMessageChunk
self.client.arun(
[convert_message_to_dict(m) for m in messages],
self.spark_user_id,
self.model_kwargs,
streaming=True,
)
for content in self.client.subscribe(timeout=self.request_timeout):
if "data" not in content:
continue
delta = content["data"]
chunk = _convert_delta_to_message_chunk(delta, default_chunk_class)
cg_chunk = ChatGenerationChunk(message=chunk)
if run_manager:
run_manager.on_llm_new_token(str(chunk.content), chunk=cg_chunk)
yield cg_chunk
def _generate(
self,
messages: List[BaseMessage],
stop: Optional[List[str]] = None,
run_manager: Optional[CallbackManagerForLLMRun] = None,
stream: Optional[bool] = None,
**kwargs: Any,
) -> ChatResult:
if stream or self.streaming:
stream_iter = self._stream(
messages=messages, stop=stop, run_manager=run_manager, **kwargs
)
return generate_from_stream(stream_iter)
self.client.arun(
[convert_message_to_dict(m) for m in messages],
self.spark_user_id,
self.model_kwargs,
False,
)
completion = {}
llm_output = {}
for content in self.client.subscribe(timeout=self.request_timeout):
if "usage" in content:
llm_output["token_usage"] = content["usage"]
if "data" not in content:
continue
completion = content["data"]
message = convert_dict_to_message(completion)
generations = [ChatGeneration(message=message)]
return ChatResult(generations=generations, llm_output=llm_output)
@property
def _llm_type(self) -> str:
return "spark-llm-chat"
class _SparkLLMClient:
"""
Use websocket-client to call the SparkLLM interface provided by Xfyun,
which is the iFlyTek's open platform for AI capabilities
"""
def __init__(
self,
app_id: str,
api_key: str,
api_secret: str,
api_url: Optional[str] = None,
spark_domain: Optional[str] = None,
model_kwargs: Optional[dict] = None,
):
try:
import websocket
self.websocket_client = websocket
except ImportError:
raise ImportError(
"Could not import websocket client python package. "
"Please install it with `pip install websocket-client`."
)
self.api_url = SPARK_API_URL if not api_url else api_url
self.app_id = app_id
self.model_kwargs = model_kwargs
self.spark_domain = spark_domain or SPARK_LLM_DOMAIN
self.queue: Queue[Dict] = Queue()
self.blocking_message = {"content": "", "role": "assistant"}
self.api_key = api_key
self.api_secret = api_secret
@staticmethod
def _create_url(api_url: str, api_key: str, api_secret: str) -> str:
"""
Generate a request url with an api key and an api secret.
"""
# generate timestamp by RFC1123
date = format_date_time(mktime(datetime.now().timetuple()))
# urlparse
parsed_url = urlparse(api_url)
host = parsed_url.netloc
path = parsed_url.path
signature_origin = f"host: {host}\ndate: {date}\nGET {path} HTTP/1.1"
# encrypt using hmac-sha256
signature_sha = hmac.new(
api_secret.encode("utf-8"),
signature_origin.encode("utf-8"),
digestmod=hashlib.sha256,
).digest()
signature_sha_base64 = base64.b64encode(signature_sha).decode(encoding="utf-8")
authorization_origin = f'api_key="{api_key}", algorithm="hmac-sha256", \
headers="host date request-line", signature="{signature_sha_base64}"'
authorization = base64.b64encode(authorization_origin.encode("utf-8")).decode(
encoding="utf-8"
)
# generate url
params_dict = {"authorization": authorization, "date": date, "host": host}
encoded_params = urlencode(params_dict)
url = urlunparse(
(
parsed_url.scheme,
parsed_url.netloc,
parsed_url.path,
parsed_url.params,
encoded_params,
parsed_url.fragment,
)
)
return url
def run(
self,
messages: List[Dict],
user_id: str,
model_kwargs: Optional[dict] = None,
streaming: bool = False,
) -> None:
self.websocket_client.enableTrace(False)
ws = self.websocket_client.WebSocketApp(
_SparkLLMClient._create_url(
self.api_url,
self.api_key,
self.api_secret,
),
on_message=self.on_message,
on_error=self.on_error,
on_close=self.on_close,
on_open=self.on_open,
)
ws.messages = messages # type: ignore[attr-defined]
ws.user_id = user_id # type: ignore[attr-defined]
ws.model_kwargs = self.model_kwargs if model_kwargs is None else model_kwargs # type: ignore[attr-defined]
ws.streaming = streaming # type: ignore[attr-defined]
ws.run_forever()
def arun(
self,
messages: List[Dict],
user_id: str,
model_kwargs: Optional[dict] = None,
streaming: bool = False,
) -> threading.Thread:
ws_thread = threading.Thread(
target=self.run,
args=(
messages,
user_id,
model_kwargs,
streaming,
),
)
ws_thread.start()
return ws_thread
def on_error(self, ws: Any, error: Optional[Any]) -> None:
self.queue.put({"error": error})
ws.close()
def on_close(self, ws: Any, close_status_code: int, close_reason: str) -> None:
logger.debug(
{
"log": {
"close_status_code": close_status_code,
"close_reason": close_reason,
}
}
)
self.queue.put({"done": True})
def on_open(self, ws: Any) -> None:
self.blocking_message = {"content": "", "role": "assistant"}
data = json.dumps(
self.gen_params(
messages=ws.messages, user_id=ws.user_id, model_kwargs=ws.model_kwargs
)
)
ws.send(data)
def on_message(self, ws: Any, message: str) -> None:
data = json.loads(message)
code = data["header"]["code"]
if code != 0:
self.queue.put(
{"error": f"Code: {code}, Error: {data['header']['message']}"}
)
ws.close()
else:
choices = data["payload"]["choices"]
status = choices["status"]
content = choices["text"][0]["content"]
if ws.streaming:
self.queue.put({"data": choices["text"][0]})
else:
self.blocking_message["content"] += content
if status == 2:
if not ws.streaming:
self.queue.put({"data": self.blocking_message})
usage_data = (
data.get("payload", {}).get("usage", {}).get("text", {})
if data
else {}
)
self.queue.put({"usage": usage_data})
ws.close()
def gen_params(
self, messages: list, user_id: str, model_kwargs: Optional[dict] = None
) -> dict:
data: Dict = {
"header": {"app_id": self.app_id, "uid": user_id},
"parameter": {"chat": {"domain": self.spark_domain}},
"payload": {"message": {"text": messages}},
}
if model_kwargs:
data["parameter"]["chat"].update(model_kwargs)
logger.debug(f"Spark Request Parameters: {data}")
return data
def subscribe(self, timeout: Optional[int] = 30) -> Generator[Dict, None, None]:
while True:
try:
content = self.queue.get(timeout=timeout)
except queue.Empty as _:
raise TimeoutError(
f"SparkLLMClient wait LLM api response timeout {timeout} seconds"
)
if "error" in content:
raise ConnectionError(content["error"])
if "usage" in content:
yield content
continue
if "done" in content:
break
if "data" not in content:
break
yield content
