648db22b |
1 | #!/usr/bin/env python3 |
2 | |
3 | # ################################################################ |
4 | # Copyright (c) Meta Platforms, Inc. and affiliates. |
5 | # All rights reserved. |
6 | # |
7 | # This source code is licensed under both the BSD-style license (found in the |
8 | # LICENSE file in the root directory of this source tree) and the GPLv2 (found |
9 | # in the COPYING file in the root directory of this source tree). |
10 | # You may select, at your option, one of the above-listed licenses. |
11 | # ########################################################################## |
12 | |
13 | # Rate limiter, replacement for pv |
14 | # this rate limiter does not "catch up" after a blocking period |
15 | # Limitations: |
16 | # - only accepts limit speed in MB/s |
17 | |
18 | import sys |
19 | import time |
20 | |
21 | MB = 1024 * 1024 |
22 | rate = float(sys.argv[1]) * MB |
23 | start = time.time() |
24 | total_read = 0 |
25 | |
26 | # sys.stderr.close() # remove error message, for Ctrl+C |
27 | |
28 | try: |
29 | buf = " " |
30 | while len(buf): |
31 | now = time.time() |
32 | to_read = max(int(rate * (now - start)), 1) |
33 | max_buf_size = 1 * MB |
34 | to_read = min(to_read, max_buf_size) |
35 | start = now |
36 | |
37 | buf = sys.stdin.buffer.read(to_read) |
38 | sys.stdout.buffer.write(buf) |
39 | |
40 | except (KeyboardInterrupt, BrokenPipeError) as e: |
41 | pass |