jinja2.exceptions.TemplateAssertionError: no test named 'boolean' when attempting to visit UI

[SethTales]

Describe the bug

After running the locust command, I see:

[2022-05-02 14:19:44,219] CCI-PF310CHF/INFO/locust.main: Starting web interface at http://0.0.0.0:8089 (accepting connections from all network interfaces)
[2022-05-02 14:19:44,227] CCI-PF310CHF/INFO/locust.main: Starting Locust 2.8.6

then, when I got to visit the UI at http://localhost:8089, it generates the following stacktrace:

Traceback (most recent call last):
  File "/home/sethtales/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
    self.run_application()
  File "/home/sethtales/.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 945, in run_application
    self.result = self.application(self.environ, self.start_response)
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 2095, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 2080, in wsgi_app
    response = self.handle_exception(e)
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 2077, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 1525, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 1523, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/app.py", line 1509, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/home/sethtales/.local/lib/python3.8/site-packages/locust/web.py", line 399, in wrapper
    return view_func(*args, **kwargs)
  File "/home/sethtales/.local/lib/python3.8/site-packages/locust/web.py", line 135, in index
    return render_template("index.html", **self.template_args)
  File "/home/sethtales/.local/lib/python3.8/site-packages/flask/templating.py", line 149, in render_template
    ctx.app.jinja_env.get_or_select_template(template_name_or_list),
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 869, in get_or_select_template
    return self.get_template(template_name_or_list, parent, globals)
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 830, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 804, in _load_template
    template = self.loader.load(self, name, globals)
  File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 125, in load
    code = environment.compile(source, name, filename)
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 591, in compile
    self.handle_exception(exc_info, source_hint=source_hint)
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3/dist-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/home/sethtales/.local/lib/python3.8/site-packages/locust/templates/index.html", line 85, in <module>
    {% if not ((value is none) or (value is boolean)) %}
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 542, in _generate
    return generate(source, self, name, filename, defer_init=defer_init,
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 82, in generate
    generator.visit(node)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 754, in visit_Template
    self.blockvisit(node.body, frame)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
    self.visit(node, frame)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1122, in visit_For
    self.blockvisit(node.body, loop_frame)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 378, in blockvisit
    self.visit(node, frame)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1157, in visit_If
    self.visit(node.test, if_frame)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
    return f(self, node, frame, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1497, in visitor
    self.visit(node.node, frame)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
    return f(self, node, frame, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1484, in visitor
    self.visit(node.right, frame)
  File "/usr/lib/python3/dist-packages/jinja2/visitor.py", line 38, in visit
    return f(node, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 70, in new_func
    return f(self, node, frame, **kwargs)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 1607, in visit_Test
    self.fail('no test named %r' % node.name, node.lineno)
  File "/usr/lib/python3/dist-packages/jinja2/compiler.py", line 315, in fail
    raise TemplateAssertionError(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateAssertionError: no test named 'boolean'
2022-05-02T21:19:47Z {'REMOTE_ADDR': '::1', 'REMOTE_PORT': '54720', 'HTTP_HOST': 'localhost:8089', (hidden keys: 33)} failed with TemplateAssertionError

Expected behavior

I should be able to visit the UI

Actual behavior

Described above

Steps to reproduce

Install locust, attempt to run and it does not work

Environment

• OS: Windows 10, using WSL
• Python version: 3.8.10
• Locust version: 2.8.6
• Locust command line that you ran: locust
• Locust file contents (anonymized if necessary):

import time
from locust import HttpUser, task, between
import csv

class Last30DaysJobAggUser(HttpUser):
    wait_time = between(0,1)
    request_params = []

    @task
    def get_job_aggregated_items_all_branches(self):
        for params in self.request_params:
            self.client.get(f'http://127.0.0.1:8085/resource-usage/{params["org_id"]}/{params["project_id"]}/workflows/{params["wf_name"]}/jobs&reporting-window=last-30-days')

    def on_start(self):
        with open('../last_30_days_most_jobs.csv') as input:
            reader = csv.reader(input, delimiter=',')
            next(reader, None) # skip headers
            for row in reader:
                request_params = {}
                request_params["org_id"] = row[0]
                request_params["project_id"] = row[1]
                request_params["wf_name"] = row[2]
                self.request_params.append(request_params)

[pgaxatte]

I had the same issue and I fixed it by forcing the upgrade of Jinja2 (i'm using a virtualenv):

python -m virtualenv locust-venv
source locust-venv/bin/activate
pip install locust

Jinja2 (according to setup.cfg) is set to <3.1.0 which results in:

pip list | grep -i jinja
Jinja2                 2.10.1

By forcing the upgrade using pip install --upgrade Jijna2 I get:

pip list | grep -i jinja
Jinja2                 3.1.2

And now locust is working fine.

I guess the constraint on Jinja2 is not necessary anymore?