Function "update_tags" not working

[RunzhongHuang]

Hi,

In the README.md file, there is one part of tutorial is updating the tags to the span (zipkin.update_tags(id=1, user_id=2)). I tried this in two different approach and both returns me errors.

1, AttributeError: 'ZipkinLoggingContext' object has no attribute 'binary_annotations_dict'

I encountered this error while I put the "update_tags" inside the route function as below (function name "index").

from flask import Flask
from flask_zipkin import Zipkin
import requests

app = Flask(__name__)
app.config['ZIPKIN_DISABLE'] = False
app.config['ZIPKIN_DSN'] = "<url>"
zipkin = Zipkin(app)

@app.route('/')
def index():
    headers = {}
    headers.update(zipkin.create_http_headers_for_new_span())
    zipkin.update_tags(id=1, user_id=2)
    r = requests.get('<url>', headers=headers)
    return r.text, 200

# Start the app server
if __name__ == '__main__':
    app.run(debug=True, host='127.0.0.1', threaded=True)

-----------------------------------------------

Traceback (most recent call last):
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 2091, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 2076, in wsgi_app
    response = self.handle_exception(e)
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\<path>\venv\lib\site-packages\flask\app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "C:\<path>\flask-zipkin-test.py", line 26, in index
    zipkin.update_tags(id=1, user_id=2)
  File "C:\<path>\venv\lib\site-packages\flask_zipkin.py", line 152, in update_tags
    g._zipkin_span.logging_context.binary_annotations_dict.update(
AttributeError: 'ZipkinLoggingContext' object has no attribute 'binary_annotations_dict'

2, RuntimeError: Working outside of application context.

This error is triggered if I put the "update_tag" function right after initialize Zipkin object.

from flask import Flask
from flask_zipkin import Zipkin
import requests

app = Flask(__name__)
app.config['ZIPKIN_DISABLE'] = False
app.config['ZIPKIN_DSN'] = "<URL>"
zipkin = Zipkin(app)
zipkin.update_tags(id=1, user_id=2)

@app.route('/')
def index():
    headers = {}
    headers.update(zipkin.create_http_headers_for_new_span())
    r = requests.get('<URL>', headers=headers)
    return r.text, 200

# Start the app server
if __name__ == '__main__':
    app.run(debug=True, host='127.0.0.1', threaded=True)

---------------------------------------------------

Traceback (most recent call last):
  File "C:/<path>/flask-zipkin-test.py", line 10, in <module>
    zipkin.update_tags(id=1, user_id=2)
  File "C:\<path>\venv\lib\site-packages\flask_zipkin.py", line 149, in update_tags
    if all([hasattr(g, '_zipkin_span'),
  File "C:\<path>\venv\lib\site-packages\werkzeug\local.py", line 422, in __get__
    obj = instance._get_current_object()
  File "C:\<path>\venv\lib\site-packages\werkzeug\local.py", line 544, in _get_current_object
    return self.__local()  # type: ignore
  File "C:\<path>\venv\lib\site-packages\flask\globals.py", line 40, in _lookup_app_object
    raise RuntimeError(_app_ctx_err_msg)
RuntimeError: Working outside of application context.

I am not sure if I use the method in a wrong way, if yes, please let me know which part I did it wrong.