Created
August 25, 2018 01:13
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Concurrent directory traversal
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| import os | |
| import argparse | |
| import hashlib | |
| import threading | |
| from collections import defaultdict | |
| from queue import Queue | |
| rem = Queue(maxsize=0) | |
| sem = threading.Semaphore(value=100) | |
| _file_info = defaultdict(set) | |
| _file_info_lock = threading.Lock() | |
| _seen = set() | |
| _seen_lock = threading.Lock() | |
| def worker(path): | |
| while True: | |
| path = os.path.join(path, rem.get()) | |
| with _seen_lock: | |
| if path in _seen: | |
| continue | |
| else: | |
| _seen.add(path) | |
| sem.acquire() | |
| try: | |
| if os.path.isdir(path): | |
| for _path in os.listdir(path): | |
| if _path.startswith('.'): | |
| continue | |
| rem.put_nowait(os.path.join(path, _path)) | |
| else: | |
| hasher = hashlib.md5() | |
| with open(path, 'rb') as f: | |
| hasher.update(f.read()) | |
| with _file_info_lock: | |
| _file_info[hasher.hexdigest()].add( | |
| (path, os.stat(path).st_size) | |
| ) | |
| finally: | |
| sem.release() | |
| rem.task_done() | |
| if __name__ == '__main__': | |
| parser = argparse.ArgumentParser() | |
| parser.add_argument('-d') | |
| parser.add_argument('-n', type=int) | |
| args = parser.parse_args() | |
| for _ in range(args.n): | |
| threading.Thread(target=worker, args=(args.d,)).start() | |
| rem.put_nowait(os.path.join(os.getcwd(), args.d)) | |
| rem.join() | |
| # print(_file_info) | |
| os._exit(0) |
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