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app.py
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"""Created originally by Ethan Chiu 10/25/16
v2.0.0 created on 8/4/18
Complete redesign for efficiency and scalability
Uses Python 3 now
v2.1.0 created on 5/10/19
Improve efficiency and design
"""
from .pylint_errors import pylint_dict_final
from flask import Flask, render_template, request, jsonify, session
from flask_socketio import SocketIO
import eventlet.wsgi
import tempfile, mmap, os, re
from datetime import datetime
from pylint import epylint as lint
from subprocess import Popen, PIPE, STDOUT
from multiprocessing import Pool, cpu_count
def is_os_linux():
if os.name == "nt":
return False
return True
# Configure Flask App
# Remember to change the SECRET_KEY!
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
app.config['DEBUG'] = True
socketio = SocketIO(app)
# Get number of cores for multiprocessing
num_cores = cpu_count()
@app.route('/')
def index():
"""Display home page
:return: index.html
Initializes session variables for tracking time between running code.
"""
session["count"] = 0
session["time_now"] = datetime.now()
return render_template("index.html")
@app.route('/check_code', methods=['POST'])
def check_code():
"""Run pylint on code and get output
:return: JSON object of pylint errors
{
{
"code":...,
"error": ...,
"message": ...,
"line": ...,
"error_info": ...,
}
...
}
For more customization, please look at Pylint's library code:
https://github.com/PyCQA/pylint/blob/master/pylint/lint.py
"""
# Session to handle multiple users at one time and to get textarea from AJAX call
session["code"] = request.form['text']
text = session["code"]
output = evaluate_pylint(text)
# MANAGER.astroid_cache.clear()
return jsonify(output)
# Run python in secure system
@app.route('/run_code', methods=['POST'])
def run_code():
"""Run python 3 code
:return: JSON object of python 3 output
{
...
}
"""
# Don't run too many times
if slow():
return jsonify("Running code too much within a short time period. Please wait a few seconds before clicking \"Run\" each time.")
session["time_now"] = datetime.now()
output = None
if not "file_name" in session:
with tempfile.NamedTemporaryFile(delete=False) as temp:
session["file_name"] = temp.name
cmd = 'python ' + session["file_name"]
p = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE,
stderr=STDOUT, close_fds=True)
output = p.stdout.read()
return jsonify(output.decode('utf-8'))
# Slow down if user clicks "Run" too many times
def slow():
session["count"] += 1
time = datetime.now() - session["time_now"]
if float(session["count"]) / float(time.total_seconds()) > 5:
return True
return False
def evaluate_pylint(text):
"""Create temp files for pylint parsing on user code
:param text: user code
:return: dictionary of pylint errors:
{
{
"code":...,
"error": ...,
"message": ...,
"line": ...,
"error_info": ...,
}
...
}
"""
# Open temp file for specific session.
# IF it doesn't exist (aka the key doesn't exist), create one
if "file_name" in session:
f = open(session["file_name"], "w")
for t in text:
f.write(t)
f.flush()
else:
with tempfile.NamedTemporaryFile(delete=False) as temp:
session["file_name"] = temp.name
for t in text:
temp.write(t.encode("utf-8"))
temp.flush()
try:
ARGS = " -r n --disable=R,C"
(pylint_stdout, pylint_stderr) = lint.py_run(
session["file_name"] + ARGS, return_std=True)
except Exception as e:
raise Exception(e)
if pylint_stderr.getvalue():
raise Exception("Issue with pylint configuration")
return format_errors(pylint_stdout.getvalue())
# def split_error_gen(error):
# """Inspired by this Python discussion: https://bugs.python.org/issue17343
# Uses a generator to split error by token and save some space
#
# :param error: string to be split
# :yield: next line split by new line
# """
# for e in error.split():
# yield e
def process_error(error):
"""Formats error message into dictionary
:param error: pylint error full text
:return: dictionary of error as:
{
"code":...,
"error": ...,
"message": ...,
"line": ...,
"error_info": ...,
}
"""
# Return None if not an error or warning
if error == " " or error is None:
return None
if error.find("Your code has been rated at") > -1:
return None
list_words = error.split()
if len(list_words) < 3:
return None
# Detect OS
line_num = None
if is_os_linux():
try:
line_num = error.split(":")[1]
except Exception as e:
print(os.name + " not compatible: " + e)
else:
line_num = error.split(":")[2]
# list_words.pop(0)
error_yet, message_yet, first_time = False, False, True
i, length = 0, len(list_words)
# error_code=None
while i < length:
word = list_words[i]
if (word == "error" or word == "warning") and first_time:
error_yet = True
first_time = False
i += 1
continue
if error_yet:
error_code = word[1:-1]
error_string = list_words[i + 1][:-1]
i = i + 3
error_yet = False
message_yet = True
continue
if message_yet:
full_message = ' '.join(list_words[i:length - 1])
break
i += 1
error_info = pylint_dict_final[error_code]
return {
"code": error_code,
"error": error_string,
"message": full_message,
"line": line_num,
"error_info": error_info,
}
def format_errors(pylint_text):
"""Format errors into parsable nested dictionary
:param pylint_text: original pylint output
:return: dictionary of errors as:
{
{
"code":...,
"error": ...,
"message": ...,
"line": ...,
"error_info": ...,
}
...
}
"""
errors_list = pylint_text.splitlines(True)
# If there is not an error, return nothing
if "--------------------------------------------------------------------" in errors_list[1] and \
"Your code has been rated at" in errors_list[2] and "module" not in errors_list[0]:
return None
errors_list.pop(0)
pylint_dict = {}
try:
pool = Pool(num_cores)
pylint_dict = pool.map(process_error, errors_list)
finally:
pool.close()
pool.join()
return pylint_dict
# count = 0
# for error in errors_list:
# pylint_dict[count]=process_error(error)
# count +=1
return pylint_dict
# def find_error(id):
# """Find relevant info about pylint error
#
# :param id: pylint error id
# :return: returns error message description
#
# pylint_errors.txt is the result from "pylint --list-msgs"
# """
# file = open('pylint_errors.txt', 'r')
# s = mmap.mmap(file.fileno(), 0, access=mmap.ACCESS_READ)
# location = s.find(id.encode())
# if location != -1:
# search_text = s[location:]
# lines = search_text.splitlines(True)
# error_message = []
# for l in lines:
# if l.startswith(':'.encode()):
# full_message = b''.join(error_message)
# full_message = full_message.decode('utf-8')
# replaced = id+"):"
# full_message = full_message.replace(replaced, "")
# full_message = full_message.replace("Used", "Occurs")
# return full_message
# error_message.append(l)
#
# return "No information at the moment"
def remove_temp_code_file():
os.remove(session["file_name"])
@socketio.on('disconnect', namespace='/check_disconnect')
def disconnect():
"""Remove temp file associated with current session"""
remove_temp_code_file()
if __name__ == "__main__":
"""Initialize app"""
socketio.run(app)