import os
import sys,getopt
from pathlib import Path
import datetime, time
from datetime import datetime

def get_files_in_dir(source):
   try:
      for entry in os.scandir(source):
         if entry.is_dir(follow_symlinks=False):
            yield from get_files_in_dir(entry.path)
         else:
            yield entry.path

   except PermissionError as e:
      print('in exception in get_files_in_dir function')
      pass

def main(argv):
   print('\nNumber of arguments:', len(sys.argv), 'arguments.')
   print('\nArgument List:', str(sys.argv))

   source = argv[1]

   print('\nSource is ',source)

   tstamp = datetime.now()
   print('Start time is ',f"{tstamp:%Y-%m-%d.%H:%M:%S}")

   for file in get_files_in_dir(source):
      try:
         print('file is ',file)
      except StopIteration as e:
         print('in StopIteration exception')
         break

   end_tstamp = datetime.now()
   print('End time is ',f"{end_tstamp:%Y-%m-%d.%H:%M:%S}")

   duration = end_tstamp - tstamp
   print('Duration is ',str(duration).split('.')[0]) 

   exit    
                
if __name__ == '__main__':
	  
    # send_file_to_S3.py source destination
    # source - file or directory
    # destination S3 bucket formatted like this:  's3://bucket/key'
    #
    # script will issue an invalid credentials error if the aws configure command 
    # has not been used to configure the connection
    print('argv is ',sys.argv)
    main(sys.argv[0:])