Adding attributes to an existing span in auto (or programmatically) instrumented libraries

[rossgrambo]

Hello! This is hopefully just a question.

We're ensuring our SDK works well with OpenTelemetry. Our guidance in .net has been to use the AutoInstrumentation as much as you can and then add an attributes.extraField. In .net it's easy because the Activity is available to us anywhere.

In python, it's unclear to me if it's possible to add attributes to the "current" span without fully creating your own span in manual instrumentation. For example, I want to advice developers to do something like:

(Example taken from https://opentelemetry.io/docs/languages/python/getting-started/#add-manual-instrumentation-to-automatic-instrumentation)
Existing code:

from random import randint
from flask import Flask

from opentelemetry import trace

# Acquire a tracer
tracer = trace.get_tracer("diceroller.tracer")

app = Flask(__name__)

@app.route("/rolldice")
def roll_dice():
    return str(roll())

def roll():
    # custom code

and add something like:

def roll():
    currentSpan.attribute["somethingImportant"] = generateValue(somethingFromRequest);

(currentSpan referring to the span created for the request by the auto instrumentation)

Is this possible? I don't think a processor works here because I need the request object- which isn't always available everywhere in some frameworks.

[rossgrambo]

Nvm~

from opentelemetry import trace

trace.get_current_span().set_attribute("Foo", "Bar")

was all I needed.