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CodeSheriff.py
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import os
import sys
import filecmp
import re
import subprocess
from subprocess import CalledProcessError, TimeoutExpired
STATUS_CODES = {
200: 'OK',
201: 'ACCEPTED',
400: 'WRONG ANSWER',
401: 'COMPILATION ERROR',
402: 'RUNTIME ERROR',
403: 'INVALID FILE',
404: 'FILE NOT FOUND',
408: 'TIME LIMIT EXCEEDED'
}
class Program:
""" Class that handles all the methods of a user program """
def __init__(self, filename, inputfile, timelimit, expectedoutputfile):
"""Receives a name of a file from the userIt must be a valid c, c++, java file """
self.fileName = filename # Full name of the source code file
self.language = None # Language
self.name = None # File name without extension
self.inputFile = inputfile # Input file
self.expectedOutputFile = expectedoutputfile # Expected output file
self.actualOutputFile = "output.txt" # Actual output file
self.timeLimit = timelimit # Time limit set for execution in seconds
def isvalidfile(self):
""" Checks if the filename is valid """
validfile = re.compile("^(\S+)\.(java|cpp|c)$")
matches = validfile.match(self.fileName)
if matches:
self.name, self.language = matches.groups()
return True
return False
def compile(self):
""" Compiles the given program, returns status code and errors """
# Remove previous executables
if os.path.isfile(self.name):
os.remove(self.name)
# Check if files are present
if not os.path.isfile(self.fileName):
return 404, 'Missing file'
# Check language
cmd = None
if self.language == 'java':
cmd = 'javac {}'.format(self.fileName)
elif self.language == 'c':
cmd = 'gcc -o {0} {1}'.format(self.name, self.fileName)
elif self.language == 'cpp':
cmd = 'g++ -o {0} {1}'.format(self.name, self.fileName)
# Invalid files
if cmd is None:
return 403, 'File is of invalid type'
try:
proc = subprocess.run(
cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True
)
# Check for errors
if proc.returncode != 0:
return 401, proc.stderr
else:
return 200, None
except CalledProcessError as e:
print(e.output)
def run(self):
""" Runs the executable, returns status code and errors """
# Check if files are present
if not os.path.isfile(self.fileName) :
return 404, 'Missing executable file'
# Check language
cmd = None
if self.language == 'java':
cmd = 'java {}'.format(self.name)
elif self.language in ['c', 'cpp']:
cmd = self.name
# Invalid files
if cmd is None:
return 403, 'File is of invalid type'
try:
with open('output.txt', 'w') as fout:
fin = None
if self.inputFile and os.path.isfile(self.inputFile):
fin = open(self.inputFile, 'r')
proc = subprocess.run(
cmd,
stdin=fin,
stdout=fout,
stderr=subprocess.PIPE,
timeout=self.timeLimit,
universal_newlines=True
)
# Check for errors
if proc.returncode != 0:
return 402, proc.stderr
else:
return 200, None
except TimeoutExpired as tle:
return 408, tle
except CalledProcessError as e:
print(e.output)
# Perform cleanup
if self.language == 'java':
os.remove('{}.class'.format(self.name))
elif self.language in ['c', 'cpp']:
os.remove(self.name)
def match(self):
if os.path.isfile(self.actualOutputFile) and os.path.isfile(self.expectedOutputFile):
result = filecmp.cmp(self.actualOutputFile, self.expectedOutputFile)
if result:
return 201, None
else:
return 400, None
else:
return 404, 'Missing output files'
def codechecker(filename, inputfile=None, expectedoutput=None, timeout=1, check=True):
newprogram = Program(
filename=filename,
inputfile=inputfile,
timelimit=timeout,
expectedoutputfile=expectedoutput
)
if newprogram.isvalidfile():
print('Executing code checker...')
# Compile program
compileResult, compileErrors = newprogram.compile()
print('Compiling... {0}({1})'.format(STATUS_CODES[compileResult], compileResult), flush=True)
if compileErrors is not None:
sys.stdout.flush()
print(compileErrors, file=sys.stderr)
exit(0)
# Run program
runtimeResult, runtimeErrors = newprogram.run()
print('Running... {0}({1})'.format(STATUS_CODES[runtimeResult], runtimeResult), flush=True)
if runtimeErrors is not None:
sys.stdout.flush()
print(runtimeErrors, file=sys.stderr)
exit(0)
if check:
# Match expected output
matchResult, matchErrors = newprogram.match()
print('Verdict... {0}({1})'.format(STATUS_CODES[matchResult], matchResult), flush=True)
if matchErrors is not None:
sys.stdout.flush()
print(matchErrors, file=sys.stderr)
exit(0)
else:
print('FATAL: Invalid file', file=sys.stderr)
if __name__ == '__main__':
codechecker(
# Source code file
filename='sample.cpp',
# Input file
inputfile='sample_input.txt',
# Expected output
expectedoutput='expected_output.txt',
# Time limit
timeout=1,
# Set to true to check actual output against expected output
check=True
)