'NoneType' object has no attribute 'events'

[Joannzhou]

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Example Code

from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate
from langchain_community.chat_models import ChatZhipuAI
from langchain.schema.output_parser import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate
from langchain_openai import ChatOpenAI

from dotenv import load_dotenv, find_dotenv
_ = load_dotenv(find_dotenv())

llm = ChatOpenAI(
        model="gpt-4-1106-preview",
        temperature=0,
        model_kwargs={
            "seed": 42
        },
    )

model = ChatZhipuAI(
        model="glm-4",
        temperature=0,
        streaming=True
    )

prompt = ChatPromptTemplate.from_template("tell me a joke about {topic}")
parser = StrOutputParser()
chain = prompt | llm | parser

for chunk in chain.stream({"topic": "parrot"}):
    print(chunk, end="|", flush=True)

Description

In the above code, if ChatZhipuAI is used instead, an error will be reported: 'NoneType' object has no attribute 'events'

System Info

Mac Python 3.11.3
langchain==0.1.1
langchain-community==0.0.13
langchain-core==0.1.23
langchain-experimental==0.0.49
langchain-openai==0.0.3
langchain-text-splitters==0.2.1

[dosubot[bot]]

@Joannzhou Hello there! I'm a bot here to help you with bugs, questions, and becoming a contributor. Let's tackle this issue together!

To resolve the 'NoneType' object has no attribute 'events' error when using the ChatZhipuAI model, ensure that the connect_sse or aconnect_sse context manager is correctly yielding an EventSource object. This error typically occurs if the EventSource object is not properly instantiated or if the response from the HTTP client is not as expected.

Here is a snippet of the relevant code for context:

@contextmanager
def connect_sse(client: Any, method: str, url: str, **kwargs: Any) -> Iterator:
    """Context manager for connecting to an SSE stream.

    Args:
        client: The HTTP client.
        method: The HTTP method.
        url: The URL.
        **kwargs: Additional keyword arguments.

    Yields:
        The event source.
    """
    from httpx_sse import EventSource

    with client.stream(method, url, **kwargs) as response:
        yield EventSource(response)

Ensure that the EventSource is correctly created and that the client.stream method is returning a valid response. If the response is None, the EventSource will not be properly instantiated, leading to the 'NoneType' object has no attribute 'events' error.

Here is a potential fix to ensure the response is valid:

@contextmanager
def connect_sse(client: Any, method: str, url: str, **kwargs: Any) -> Iterator:
    """Context manager for connecting to an SSE stream.

    Args:
        client: The HTTP client.
        method: The HTTP method.
        url: The URL.
        **kwargs: Additional keyword arguments.

    Yields:
        The event source.
    """
    from httpx_sse import EventSource

    with client.stream(method, url, **kwargs) as response:
        if response is None:
            raise ValueError("Failed to get a valid response from the server.")
        yield EventSource(response)

This will ensure that if the response is None, an appropriate error is raised, preventing the 'NoneType' object has no attribute 'events' error ^[1].

To continue talking to Dosu, mention @dosu.

[Joannzhou]

resolved! update langchain version to support glm4