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#!/usr/bin/env python3
import argparse
import collections
import getpass
import inspect
import io
import json
import locale
import os
import random
import readline
import sys
import urllib.request
import yaml
import kpov_util
locale.setlocale(locale.LC_ALL, ['C', 'utf8'])
readline.set_completer_delims(readline.get_completer_delims().replace('/', ''))
readline.parse_and_bind('tab: complete')
TASK_URL = "file://" + os.getcwd() + '/tasks'
PARAMS_FILE = os.path.expanduser("~/.kpov_params.yaml")
DEFAULT_LANGUAGE = 'si'
# get the parameters for a task either from the user or from a file
def get_params(params, meta, language=None):
# prefill input() prompt with given text
def rlinput(prompt, prefill=''):
readline.set_startup_hook(lambda: readline.insert_text(prefill))
try:
return input(prompt)
finally:
readline.set_startup_hook()
param_name_list = list(meta.keys())
if language is None:
language = params.get('language', DEFAULT_LANGUAGE)
for name in param_name_list:
m = meta.get(name, {})
description = m.get('descriptions', {}).get(language, name)
try:
if m.get('masked', False):
s = getpass.getpass('{}: '.format(description))
else:
s = rlinput('{}: '.format(description), params.get(name, ''))
if s and m.get('w', True):
params[name] = s
elif name not in params:
params[name] = None
except EOFError:
print()
return params
def add_meta_to_argparser(argparser, meta, defaults={}):
language = defaults.get('language', DEFAULT_LANGUAGE)
for k, v in meta.items():
try:
desc = v['descriptions'][language].encode("utf-8")
except:
desc = k
argparser.add_argument('--'+k, nargs='?', type=str, help=desc,
default=defaults.get(k, None))
def http_auth(url, username, password):
password_mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()
password_mgr.add_password(None, url, username, password)
handler = urllib.request.HTTPBasicAuthHandler(password_mgr)
opener = urllib.request.build_opener(handler)
urllib.request.install_opener(opener) # now all calls to urlopen use our opener
def load_task(stream):
# the stream should definitions for the functions task(…),
# task_check and gen_params, and a dictionary params_meta
source = stream.read()
d = {}
exec(compile(source, 'task.py', 'exec'), globals(), d)
return d['task'], d['task_check'], d['params_meta'], d['gen_params']
def locate_task(params, argparser, quiet=False):
# first the URL where all tasks are stored
url_meta = {
'task_url': {'descriptions': {'si': 'URL z nalogami', 'en': 'Root URL for all tasks'}}
}
if 'task_url' not in params:
params['task_url'] = TASK_URL
add_meta_to_argparser(argparser, meta=url_meta, defaults=params)
args, unknown_args = argparser.parse_known_args()
params['task_url'] = args.task_url
if not quiet:
params = get_params(params, url_meta)
# then the student's ID (and password if neccessarry)
fetch_params_meta = collections.OrderedDict({
'username': {'descriptions': {'si': 'Uporabniško ime', 'en': 'Username'}},
})
if params.get('task_url', '').startswith('http'):
fetch_params_meta['password'] = {'descriptions': {'si': 'Geslo', 'en': 'Password'}, 'masked': True}
# and finally, the name of the task
fetch_params_meta['task_name'] = {'descriptions': {'si': 'Ime naloge', 'en': 'Task name'}, }
add_meta_to_argparser(argparser, meta=fetch_params_meta, defaults=params)
args, unknown_args = argparser.parse_known_args()
# update params with the now known args
for k, v in fetch_params_meta.items():
params[k] = vars(args).get(k, params.get(k, None))
if not quiet:
params = get_params(params, fetch_params_meta)
return params
def load_params(filename):
try:
return yaml.load(open(filename))
except:
return {}
if __name__ == '__main__':
# get the parameters needed to get to the task, such as the URLs, the name of the task and optionally an ID from the student
# start with the the parameters needed for the dialog gui to work
argparser = argparse.ArgumentParser(conflict_handler='resolve', add_help=False,
description='Get task parameters')
argparser.add_argument('-h', '--help', action='store_true')
argparser.add_argument('-q', '--quiet', action='store_true',
help='disable prompts')
argparser.add_argument('-g', '--generate_params', action='store_true',
help='generate initial values for the task parameters')
argparser.add_argument('-pf','--params_file', nargs='?', default=PARAMS_FILE,
help='a local file containing saved param values')
basic_args, unknown_args = argparser.parse_known_args()
# get default parameters including language
params = load_params(basic_args.params_file)
argparser.add_argument('-l', '--language', nargs='?',
default=params.get('language', DEFAULT_LANGUAGE),
help='the language used')
basic_args, unknown_args = argparser.parse_known_args()
params['language'] = basic_args.language
# continue with the parameters needed to get the task
params = locate_task(params, argparser, quiet=basic_args.quiet)
# TODO: if the task name is missing or invalid, try to get a list of tasks
# get task source and generate params if neccessarry
try:
task_url = params['task_url']
task_name = params['task_name']
if task_url.startswith('http'):
http_auth(task_url, params['username'], params['password'])
print("Fetching {task_url}/{task_name}/task.py…".format(**params))
source = urllib.request.urlopen("{task_url}/{task_name}/task.py".format(**params))
task, task_check, task_params_meta, gen_params = load_task(source)
except Exception as e:
print(str(e))
print()
for k, v in params.items():
if k not in ('password', 'task_params'):
print('{}: {}'.format(k, v))
with open(basic_args.params_file, 'w') as f:
yaml.dump(params, f)
exit(1)
# get task parameters
params['task_params'] = params.get('task_params', {})
params['task_params'][params['task_name']] = params['task_params'].get(params['task_name'], {})
task_params = params['task_params'][params['task_name']]
if basic_args.generate_params:
#prejema lahko samo stringe in ne številk (potrebno je str(int)
# print ("params before: {} {}".format(params, task_params))
task_params.update(gen_params(params['username'], task_params_meta))
# print ("params after: {} {}".format(params, task_params))
if task_url.startswith('http'):
response = urllib.request.urlopen('{task_url}/{task_name}/params.json'.format(**params))
web_task_params = json.load(io.TextIOWrapper(response))
task_params.update(web_task_params)
task_argparser = argparse.ArgumentParser(parents=[argparser], conflict_handler='resolve', add_help=True)
add_meta_to_argparser(task_argparser, task_params_meta, defaults=task_params)
args = vars(task_argparser.parse_args())
for k in task_params_meta:
if args.get(k):
task_params[k] = args[k]
if not basic_args.quiet:
task_params = get_params(task_params, task_params_meta, language=params['language'])
if basic_args.help:
print(task_argparser.format_help())
exit(0)
public_params = {}
for k in inspect.getargs(task.__code__)[0]:
public_params[k] = task_params[k]
params['task_params'][params['task_name']] = task_params
# save parameters for the next run
with open(basic_args.params_file, 'w') as f:
yaml.dump(params, f)
try:
print()
print('Running task… ')
task_result = task(**public_params)
print('Checking task… ')
score, hints = task_check(task_result, task_params)
print('Done!')
print()
print('Score: {}'.format(score))
print('Hints:')
for hint in hints:
print(hint)
except Exception as e:
import traceback
traceback.print_exc()
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