tedsuo

from opentelemetry.trace.status import StatusCode

@app.route("/hello")
def hello():
   span = trace.propagation.get_current_span()
   try:
       1 / 0
   except ZeroDivisionError as error:
       # record an exception
       span.record_exception(error)

tedsuo

from opentelemetry import trace

# create a tracer and name it after your package
tracer = trace.get_tracer(__name__)

@app.route("/hello")
def hello():
   # add latency to the parent span
   sleep(20 / 1000)

tedsuo

# Start the span with a name and a parent span
child = tracer.start_span("my_operation", parent=parent)

try:
   # pass the span around as a parameter
   do_work(span=child)
finally:
   # End the span, which measures the span duration and
   # triggers the span data to be exported.
   # WARNING: failing to end a span will create a leak.

tedsuo

from opentelemetry import trace

@app.route("/hello")
def hello():
   # get the current span, created by flask
   span = trace.get_current_span()
   # add more attributes to the server span
   span.set_attribute("http.route", "some_route")
   # add events (AKA structured logging)
   span.add_event("event message",

tedsuo

import requests

for i in range(5):
   r = requests.get("http://localhost:8000/hello")
   print(r.text)

tedsuo

#!/usr/bin/env python3

from flask import Flask
from time import sleep

PORT = 8000
app = Flask(__name__)

@app.route("/hello")
def hello():

tedsuo

try {
  throw ("ooops");
} catch (error) {
  // Add the exception as a properly formatted event.
  span.recordException(error);

  // Set the status code to make the exception count 
  // as an error.
  span.setStatus({ code: 
    opentelemetry.CanonicalCode.UNKNOWN });

tedsuo

app.get('/hello', (req, res) => {
  // start a new span named “sleeper”
 const childSpan = tracer.startSpan("sleeper");
 
 // use withSpan to create a new context
 tracer.withSpan(childSpan,()=> {
   setTimeout(()=> {
     // getCurrentSpan now correctly returns childSpan
     const span = tracer.getCurrentSpan();
     span.addEvent('sending response');

tedsuo

app.get('/hello', (req, res) => {
  // start a new span named “sleeper”
 const childSpan = tracer.startSpan("sleeper");

 setTimeout(()=> {
   // childSpan works normally when referenced
   childSpan.addEvent('finished sleeping');
   // However, starting a span does not automatically
   // set it to the current span. getCurrentSpan still 
   // returns the parent span.

tedsuo

app.get('/hello', (req, res) => {
 tracer.getCurrentSpan()
       .setAttribute('projectID', '123')
       .addEvent('setting timeout', { sleep: 300 });

 setTimeout(()=> {
   tracer.getCurrentSpan().addEvent('sending response');
   res.status(200).send('Hello World');
 }, 300);
});