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# coding=utf-8
import ast
import multiprocessing.managers
import threading
import server.user_session
from db.models import Problem
from . import problems
__all__ = ['PythonSession']
class PythonSession(object):
"""Abstracts a Python session.
Only public methods are available to the outside world due to the use of multiprocessing managers.
Therefore prefix any private methods with an underscore (_).
No properties are accessible; use getters and setters instead.
Values are passed by value instead of by reference (deep copy!).
"""
def __init__(self):
self._access_lock = threading.Lock()
self._sent_hints = []
self._interpreter = None
# Proxy for calling the Python runner. We use a separate connection for
# each session so the runner can be restarted without affecting the
# server.
_m = multiprocessing.managers.BaseManager(address=('localhost', 3031),
authkey=b'c0d3q3y-python')
_m.register('Python')
_m.connect()
self._python = _m.Python()
self.create()
def run(self, code=None, inputs=None, timeout=1.0):
with self._access_lock:
return self._python.run(code, inputs, timeout)
def create(self):
with self._access_lock:
if self._interpreter is None:
self._interpreter = self._python.create()
def pull(self):
with self._access_lock:
if self._interpreter is None:
return None
return self._python.pull(self._interpreter)
def push(self, stdin):
with self._access_lock:
if self._interpreter is not None:
self._python.push(self._interpreter, stdin)
def destroy(self):
with self._access_lock:
if self._interpreter is not None:
self._python.destroy(self._interpreter)
self._interpreter = None
def __del__(self):
# no locking needed if GC is removing us, as there cannot be any concurrent access by definition
if hasattr(self, '_interpreter') and self._interpreter is not None:
self._python.destroy(self._interpreter)
self._interpreter = None
def hint(self, sid, problem_id, program):
language, problem_group, problem = Problem.get_identifier(problem_id)
language_module = problems.load_language(language, 'common')
problem_module = problems.load_problem(language, problem_group, problem, 'common')
hints = []
if hasattr(language_module, 'hint'):
hints = language_module.hint(self.run, program)
if not hints and hasattr(problem_module, 'hint'):
hints = problem_module.hint(self.run, program)
if not hints:
hints = [{'id': 'no_hint'}]
self._instantiate_and_save_hints(language_module, problem_module, hints)
return hints
def test(self, sid, problem_id, program):
language, problem_group, problem = Problem.get_identifier(problem_id)
language_module = problems.load_language(language, 'common')
problem_module = problems.load_problem(language, problem_group, problem, 'common')
try:
n_correct, n_all = problem_module.test(self.run, program)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': n_all}}]
except AttributeError as ex:
hints = [{'id': 'test_results', 'args': {'passed': 0, 'total': 0}}]
self._instantiate_and_save_hints(language_module, problem_module, hints)
return hints
# Add hint parameters (such as message index) based on hint class. Append
# the finalized hints to the list of sent hints.
def _instantiate_and_save_hints(self, language_mod, problem_mod, hints):
with self._access_lock:
for hint in hints:
for mod in [language_mod, problem_mod]:
if hasattr(mod, 'hint_type') and hint['id'] in mod.hint_type:
hint_type = mod.hint_type[hint['id']]
hint_type.instantiate(hint, self._sent_hints)
self._sent_hints.extend(hints)
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