Brew installed locust missing UI assets

[rokkuci]

Prerequisites

• I am using the latest version of Locust
• I am reporting a bug, not asking a question

Description

Trying to run locust web interface locally on macos, but getting this type of errors:

File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 880, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 865, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/locust/web.py", line 564, in wrapper
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/locust/web.py", line 170, in index
    return render_template("index.html", template_args=self.template_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/templating.py", line 149, in render_template
    template = app.jinja_env.get_or_select_template(template_name_or_list)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/jinja2/environment.py", line 1084, in get_or_select_template
    return self.get_template(template_name_or_list, parent, globals)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/jinja2/environment.py", line 1013, in get_template
    return self._load_template(name, globals)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/jinja2/environment.py", line 972, in _load_template
    template = self.loader.load(self, name, self.make_globals(globals))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/jinja2/loaders.py", line 126, in load
    source, filename, uptodate = self.get_source(environment, name)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/templating.py", line 65, in get_source
    return self._get_source_fast(environment, template)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/templating.py", line 99, in _get_source_fast
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/gevent/pywsgi.py", line 1107, in handle_one_response
    self.run_application()
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/gevent/pywsgi.py", line 1053, in run_application
    self.result = self.application(self.environ, self.start_response)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 1498, in __call__
    return self.wsgi_app(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 1476, in wsgi_app
    response = self.handle_exception(e)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask_cors/extension.py", line 178, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 1473, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 882, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask_cors/extension.py", line 178, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/flask/app.py", line 772, in handle_user_exception
    return self.ensure_sync(handler)(e)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/locust/2.30.0/libexec/lib/python3.12/site-packages/locust/web.py", line 155, in handle_exception
    f"UI got request for {request.path}, but it resulted in a {error.code}: {error.name}",
                                                               ^^^^^^^^^^
AttributeError: 'TemplateNotFound' object has no attribute 'code'
2024-08-05T13:49:53Z {'REMOTE_ADDR': '::ffff:127.0.0.1', 'REMOTE_PORT': '54601', 'HTTP_HOST': '0.0.0.0:8089', (hidden keys: 25)} failed with AttributeError


### Command line

locust -f locustfile.py

### Locustfile contents

```python3
from locust import HttpUser, task # type: ignore

class HelloWorldUser(HttpUser):
    @task
    def hello_world(self):
        self.client.get("www.google.com")

Python version

3.12.4

Locust version

2.30.0

Operating system

macos 14.5

[cyberw]

Can you try with 2.31.0? (should be available any minute now)

If it still doesnt work, can you give some details about how you installed locust?

[rokkuci]

thanks for quick reaction, will do tomorrow morning.

[rokkuci]

now i get this:
[2024-08-06 09:11:07,455] xxx/INFO/locust.main: Starting web interface at http://0.0.0.0:8089
[2024-08-06 09:11:07,487] xxxINFO/locust.main: Starting Locust 2.31.1
[2024-08-06 09:11:18,123] xxx/ERROR/locust.web: UI got request for /, but it resulted in a 500: index.html

and browser shows "index.html"

locustfile.py:

from locust import HttpUser, task

class HelloWorldUser(HttpUser):
    @task
    def hello_world(self):
        self.client.get("www.google.com")

but locust import shows error: Import "locust" could not be resolvedPylancereportMissingImports

installed just by brew install locust.
have folder /locust in which locustfile.py is placed.
cd to that folder and running locust command.

using macOS.

[cyberw]

This due to the brew packaging, it works fine with a regular pip install locust but not via brew.

@chenrui333 are you the maintainer of the brew formula - can you have a look? Idk how brew formulas work, but the best would be to do the same as a regular pip install :)

[rokkuci]

due to some laptop restrictions i could not use pip, so would be good that this topic would not be forgotten and addressed, because we are considering to use locust in our load testing process.

[cyberw]

Definitely.

Have you tried pip install --user locust?

[rokkuci]

to be more specific, looks like im allowed to have pipx in my laptop, used it and it worked. Thanks for quick reactions.

[cyberw]

@mquinnfd is investigating a fix from our side.

[cyberw]

Should be fixed in #2839 / 2.31.2.