Running commons-ip from Python

java_runner.py

import json
import os
import subprocess

from swagger_server.models import ValidationReport

MAIN_OPTS = [
    'java',
    '-jar',
    '/home/cfw/Downloads/commons-ip2-cli-2.0.0.jar',
    'validate',
    '-i'
]
REP_OPTS = [
    '-r',
    'eark'
]

def validate_ip(info_pack):
    """Returns a tuple comprising the process exit code, the validation report
    and the captured stderr."""
    ret_code, file_name, stderr = java_runner(info_pack)
    validation_report = None
    if ret_code == 0:
        with open(file_name, 'r', encoding='utf-8') as _f:
            contents = _f.read()
        os.remove(file_name)
        validation_report = ValidationReport.from_dict(json.loads(contents))
    return ret_code, validation_report, stderr

def java_runner(ip_root):
    command = MAIN_OPTS
    command.append(ip_root)
    command+=REP_OPTS
    proc_results = subprocess.run(command, capture_output=True)
    return proc_results.returncode, proc_results.stdout.rstrip(), proc_results.stderr