Unable to use variable in keyword more than once : Variable '${arg1}' not found.

[Avnish-Dewan]

Hi,
I am facing an issue while using the variables more than once i.e. If I use a variable more than once in a keyword, it throws an error "Variable '${arg1}' not found.", whereas the first the variable is used , it works fine. I've attached the screenshots of the log files also:

Code:

*** Settings ***
Library            GeventLibrary

*** Test Cases ***
Example Test
    Log                 Hello
    Create Gevent Bundle    alias=alias1
    Add Coroutine       Task1  123  alias=alias1
    Add Coroutine       Task2   alias=alias1
    
    ${values}=          Run Coroutines    alias=alias1
    Log Many            @{values}

*** Keywords ***
Task1
    [Arguments]     ${arg1}
    Log    Task 1 started
    Log     ${arg1}
    Sleep    2
    Log     ${arg1}

Task2
    Log    Task 2 started
    Sleep    3
    Log    Task 2 finished
    RETURN   Task2

Here is the trace log for the error:

Traceback (most recent call last):
  File "src\\gevent\\greenlet.py", line 908, in gevent._gevent_cgreenlet.Greenlet.run
  File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\robot\libraries\BuiltIn.py", line 1853, in run_keyword
    return kw.run(self._context)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\robot\running\model.py", line 77, in run
    return KeywordRunner(context, run).run(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\robot\running\bodyrunner.py", line 76, in run
    return runner.run(step, context, self._run)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\robot\running\userkeywordrunner.py", line 68, in run
    return_value = self._run(context, kw.args, result)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\robot\running\userkeywordrunner.py", line 99, in _run
    raise exception
robot.errors.UserKeywordExecutionFailed: Variable '${arg1}' not found.
2023-06-01T10:36:28Z <Greenlet at 0x20909be8cc0: <bound method _RunKeyword.run_keyword of <robot.libraries.BuiltIn.BuiltIn object at 0x0000020908457B90>>('Task1', '123', '456')> failed with UserKeywordExecutionFailed

[eldaduzman]

Hi @Avnish-Dewan
What version of robotframework do you use?

[Avnish-Dewan]

Hi @eldaduzman
The RF version i am using is : Robot Framework 6.0.2 (Python 3.11.3 on win32)

[eldaduzman]

@Avnish-Dewan

Ok, it seems like the problem is when you have 2 coroutines running concurrently and then the robotframework context doesn't necessarily fit the currently running coroutine.

In your case, the executed coroutine is task1 but the context is task2.

A quick fix is to use global variables, or avoid using the same arg more than once per keyword.

In the long run I need to think of a why to safely ensure the robotframework context preservation between the keywords.

This is a high quality bug :)

[Lakitna]

I just ran into the same issue.

The workarounds don't work in my case, as I have a fair amount of complexity that I can't rewrite just for performance gains by running async.

For me, this means that, for now, I'll bail on doing anything async :(

[eldaduzman]

@Lakitna I understand, the solution is not simple, it requires maintaining an entire copy of rbf context for all coroutines, I'm working on it, it will take time.

[Lakitna]

@eldaduzman That makes sense :)
In the meantime, I can work around the performance issues I'm facing with more pipeline time, so I'll wait patiently.