import hashlib import os import random import string import tempfile import re import time import urllib from datetime import datetime from datetime import timedelta def checksum(file_path, blocksize=65536): hasher = hashlib.sha256() with open(file_path, 'r') as f: buf = f.read(blocksize) while len(buf) > 0: hasher.update(buf) buf = f.read(blocksize) return hasher.hexdigest() return None def create_working_folder(): temporary_folder = tempfile.gettempdir() folder = os.path.join(temporary_folder, random_string(10), random_string(10)) os.makedirs(folder) return (temporary_folder, folder) def download_file(name, destination): try: final_name = '{}/{}{}'.format(destination, random_string(10), os.path.splitext(name)[1]) urllib.urlretrieve( 'https://s3.amazonaws.com/jmathai/github/elodie/{}'.format(name), final_name ) return final_name except Exception as e: return False def get_file(name): file_path = get_file_path(name) if not os.path.isfile(file_path): return False return file_path def get_file_path(name): current_folder = os.path.dirname(os.path.realpath(__file__)) return os.path.join(current_folder, 'files', name) def get_test_location(): return (61.013710, 99.196656, 'Siberia') def populate_folder(number_of_files): folder = '%s/%s' % (tempfile.gettempdir(), random_string(10)) os.makedirs(folder) for x in range(0, number_of_files): ext = 'jpg' if x % 2 == 0 else 'txt' fname = '%s/%s.%s' % (folder, x, ext) with open(fname, 'a'): os.utime(fname, None) return folder def random_string(length): return ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(length)) def random_decimal(): return random.random() def random_coordinate(coordinate, precision): # Here we add to the decimal section of the coordinate by a given precision return coordinate + ((10.0 / (10.0**precision)) * random_decimal()) def temp_dir(): return tempfile.gettempdir() def is_windows(): return os.name == 'nt' # path_tz_fix(file_name) # Change timestamp in file_name by the offset # between UTC and local time, i.e. # 2015-12-05_00-59-26-with-title-some-title.jpg -> # 2015-12-04_20-59-26-with-title-some-title.jpg # (Windows only) def path_tz_fix(file_name): if is_windows(): # Calculate the offset between UTC and local time tz_shift = (datetime.fromtimestamp(0) - datetime.utcfromtimestamp(0)).seconds/3600 # replace timestamp in file_name m = re.search('(\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2})',file_name) t_date = datetime.fromtimestamp(time.mktime(time.strptime(m.group(0), '%Y-%m-%d_%H-%M-%S'))) s_date_fix = (t_date-timedelta(hours=tz_shift)).strftime('%Y-%m-%d_%H-%M-%S') return re.sub('\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}',s_date_fix,file_name) else: return file_name # time_convert(s_time) # Change s_time (struct_time) by the offset # between UTC and local time # (Windows only) def time_convert(s_time): if is_windows(): return time.gmtime((time.mktime(s_time))) else: return s_time # isclose(a,b,rel_tol) # To compare float coordinates a and b # with relative tolerance c def isclose(a, b, rel_tol = 1e-8): if not isinstance(a, (int, float)) or not isinstance(b, (int, float)): return False diff = abs(a - b) return (diff <= abs(rel_tol * a) and diff <= abs(rel_tol * b))