openai-v2: StreamWrapper missing .headers attribute when using with_raw_response streaming

[ujjwalcraft]

Description

The StreamWrapper class in opentelemetry-instrumentation-openai-v2 does not proxy the .headers attribute to the underlying stream when using with_raw_response.create(stream=True). This causes an AttributeError when code tries to access response headers.

This is related to #4032 which fixed the missing .parse() method, but .headers is still not proxied.

Steps to Reproduce

from opentelemetry.instrumentation.openai_v2 import OpenAIInstrumentor
OpenAIInstrumentor().instrument()

import openai

client = openai.AsyncAzureOpenAI(
    api_key="...",
    azure_endpoint="...",
    api_version="2024-02-15-preview",
)

async def reproducer():
    raw_response = await client.chat.completions.with_raw_response.create(
        model="gpt-4",
        messages=[{"role": "user", "content": "Say hello"}],
        max_tokens=10,
        stream=True,
    )
    # This fails:
    headers = raw_response.headers  # AttributeError: 'StreamWrapper' object has no attribute 'headers'

import asyncio
asyncio.run(reproducer())

Expected Behavior

raw_response.headers should return the HTTP response headers, same as when not instrumented.

Actual Behavior

AttributeError: 'StreamWrapper' object has no attribute 'headers'

Root Cause

StreamWrapper in patch.py doesn't implement getattr to proxy unknown attributes to self.stream.

Suggested Fix

Add getattr to StreamWrapper:
def __getattr__(self, name): return getattr(self.stream, name)

Environment

opentelemetry-instrumentation-openai-v2: 2.3b0
openai: 1.89.0
Python: 3.11

[xrmx]

@ujjwalcraft Thanks for reporting, interested in giving the fix a try?

[nagkumar91]

Taking a look 👀

[digvijay-y]

I will take this