[Bug]: Instana silently breaks s3 upload_fileobj Api

[HonakerM]

Problem Description

Hello, when using instana with the boto3.s3.Bucket.upload_fileobj api we start silently failing to upload objects.

The following code works on it's own if an s3 server is listening on localhost:9000

s3 setup using minio if needed:

 docker run -p 9000:9000 -p 9001:9001  --name minio -d minio/minio server /data --console-address ":9001"

Working python code:

from io import BytesIO

import boto3
s3_resource = boto3.resource(
    service_name="s3",
    region_name=None,
    use_ssl=True,
    verify=True,
    endpoint_url="http://127.0.0.1:9000",
    aws_access_key_id="minioadmin",
    aws_secret_access_key="minioadmin",
)
bucket = s3_resource.Bucket(name="test")
bucket.upload_fileobj(BytesIO(b"somedata"), "somekey")
response = bucket.Object("somekey").get()
file_content = response["Body"].read()
assert file_content == b"somedata"

If I change this code to have an instana span like the following. I start to get an assert error:

from io import BytesIO
from instana.singletons import tracer
import boto3
s3_resource = boto3.resource(
    service_name="s3",
    region_name=None,
    use_ssl=True,
    verify=True,
    endpoint_url="http://127.0.0.1:9000",
    aws_access_key_id="minioadmin",
    aws_secret_access_key="minioadmin",
)
bucket = s3_resource.Bucket(name="test")

with tracer.start_as_current_span("test"):
    bucket.upload_fileobj(BytesIO(b"somedata"), "somekey")
response = bucket.Object("somekey").get()
file_content = response["Body"].read()
assert file_content == b"somedata"

There are two parts that are concerning to me:

1. The error in upload_fileobj is completely hidden. The function returns like normal but the upload never happens
2. There is an error at all. Instana traces should not affect the underlying package operation

Minimal, Complete, Verifiable, Example

No response

Python Version

Python 3.11

Python Modules

Due to security I can't list all packages. Here is the affected versions used in the above example:


instana==3.4.1
boto3==1.35.78
botocore==1.35.78

Python Environment

Unable due to security. None of my envs start with `INSTANA` or have any affect on the above example

[GSVarsha]

Hi @HonakerM , thanks for reaching out!
I will take a look at this bug and your fix PR, and let you know if any other changes or additions are needed.