Capture behave outputs into a dynamically created log file

Question

I am trying to capture the Behave outputs in a file(let's say a log file). I am dynamically creating a new log file at '@then' step for every run of Behave based on datetime. Below is the sample code given in the steps/xx.py file.

def filecreation(filename):
    chwd=os.chdir('C:\\Users\\xxx\\Desktop\\features\\test_features')
    with open(filename, 'w+') as d:
        pass

cur_ts = datetime.datetime.now()
log_time_stamp = str(cur_ts).split('.')[0].replace(' ',':').replace('-',':').replace(':','')
file_name = 'ATMorFrameRelay' + log_time_stamp + '.log'
filecreation(file_name)
pass

Now i am trying to send the Behave output at every run to the log file created above. I am aware that the command "Behave -o [file name]" will create a file for every run , but thought will rather send the STDOUT to the above created file for every new run. Also is it fine/safer to use the STDOUT to write into files in a production like environment and not cause any issues.

I am a newbie to both Python and Behave, so looking forward for any solution/suggestions on how it can be achieved. Any relevant materials or information will be really appreciated too.

Thanks in advance

You didn't explain why exacly are you trying to do it. And no, there is nothing wrong to use `-o filename` in production (and it doesn't use stdout, it replaces stdout with filesrteam). Heck behave even support output formats way more suitable for further parsing like `--juni` — Tymoteusz Paul, Jul 28 '15 at 21:07
I am trying to capture the behave outputs in a dynamically created file on every run of Behave. The above given code is just for file creation, and with "behave -o", the file name has to be mentioned explicitly, so not willing to use it. Just need some leads/ideas for routing the be\have outputs to the dynamically created file rather than to the STDOUT. — Anoop Js, Jul 30 '15 at 14:39
I did give you one. Instead of rewiring the whole steps just rewire your test runner to use random name provided to -o. — Tymoteusz Paul, Jul 30 '15 at 17:58

score 0 · Accepted Answer · edited Jun 26 '17 at 09:40

Maybe something like this, where cmd is actually behave command to run the tests.

cmd = [
    'behave',
    '--no-capture',
    '--no-capture-stderr',
    '--format', 'progress2',
    '--logging-level', 'INFO',
    '--no-source', '--no-skipped', '--no-summary',
    '--tags', 'MACRO'
    ]
with io.open(filename, 'a') as writer, io.open(filename, 'rb', 1) as reader:
   process = subprocess.Popen(cmd, env=env, stdout=writer,stderr=writer)
   while process.poll() is None:
        sys.stdout.write(reader.read())
        sys.stdout.flush()
        time.sleep(0.1)
   sys.stdout.write(reader.read())
   sys.stdout.flush(

Capture behave outputs into a dynamically created log file

1 Answers1