alexeygrigorev

from glob import glob

import multiprocessing
from concurrent.futures import ProcessPoolExecutor

import cv2
from PIL import Image
import imagehash

from tqdm import tqdm

pgherveou

/// custom unique identifier
/// @see https://www.firebase.com/blog/2015-02-11-firebase-unique-identifiers.html
private let ASC_CHARS = Array("-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz")
private let DESC_CHARS = ASC_CHARS.reverse()
private var lastPushTime: UInt64 = 0
private var lastRandChars = Array<Int>(count: 12, repeatedValue: 0)

func generatePushID(ascending: Bool = true) -> String {
  let PUSH_CHARS = ascending ? ASC_CHARS: DESC_CHARS
  var timeStampChars = Array<Character>(count: 8, repeatedValue: PUSH_CHARS.first!)

mikelehen

/**
 * Fancy ID generator that creates 20-character string identifiers with the following properties:
 *
 * 1. They're based on timestamp so that they sort *after* any existing ids.
 * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
 * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
 * 4. They're monotonically increasing.  Even if you generate more than one in the same timestamp, the
 *    latter ones will sort after the former ones.  We do this by using the previous random bits
 *    but "incrementing" them by 1 (only in the case of a timestamp collision).
 */

henrik

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