loader.py

from argparse import ArgumentParser
import os
import subprocess
if __name__ == "__main__":
    current_path = os.path.dirname(os.path.realpath(__file__))
    cpp_dir = os.path.join(current_path, "cpp")
    #check for searcher executable
    if not os.path.exists(os.path.join(cpp_dir, 'search')):
        print("Compile the searcher first! try running make the in cpp/ directory")
        quit()
    def is_valid_file(parser, arg):
        if not os.path.exists(arg):
            parser.error("The file %s does not exist!" % arg)
        return arg
    parser = ArgumentParser(description="Format the database, load it to RAM and ready back-end for server")
    parser.add_argument("-f", "--file", dest="filename",
                        help="Database file to load, overrides current database file", metavar="DATABASE",
                        type=lambda x: is_valid_file(parser, x))
    args = parser.parse_args()
    if not args.filename:
        print("No formatted database currently exists, use the -f argument to load one")
        quit()
    print("File found, Loading to RAM. This might take a while..(KeyboardInterrupt to quit)")
    process = subprocess.Popen([os.path.join(cpp_dir, 'search'), os.path.join(current_path, args.filename)], shell=False)
    try:
        while("True"):
            pass
    except KeyboardInterrupt:
        pass
    process.kill()