otel-python-demo/app.py

from random import randint
from flask import Flask, request
import logging
from opentelemetry import trace

tracer = trace.get_tracer("diceroller.tracer")
app = Flask(__name__)
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

@app.route("/rolldice")
def roll_dice():
    player = request.args.get('player', default = None, type = str)
    result = str(roll3())
    if player:
        logger.warning("%s is rolling the dice: %s", player, result)
    else:
        logger.warning("Anonymous player is rolling the dice: %s", result)
    return result

@tracer.start_as_current_span("roll")
def roll():
    return randint(1, 6)

def roll2():
    with tracer.start_as_current_span("roll") as rollspan:
        try:
            res = randint(1, 6)
            rollspan.set_status(trace.StatusCode.OK)
            rollspan.set_attribute("roll.value", res)
            rollspan.add_event("事件A")
            return res
        except Exception as ex:
            rollspan.set_status(trace.StatusCode.ERROR)
            rollspan.record_exception(ex)
            raise ex

@tracer.start_as_current_span("roll")
def roll3():
    # 其它业务代码...

    with tracer.start_as_current_span("randint") as randspan:
        try:
            res = randint(1, 6)
            randspan.set_status(trace.StatusCode.OK)
            randspan.set_attribute("roll.value", res)
            randspan.add_event("事件A")
            return res
        except Exception as ex:
            randspan.set_status(trace.StatusCode.ERROR)
            randspan.record_exception(ex)
            raise ex

    # 其它业务代码...