Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/Reflector.py
blob: f1418299e69499ba0d80e9a4bb5e048f21a7c8ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
#!/usr/bin/env python3

# Copyright (C) 2012-2019  Xyne
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# (version 2) as published by the Free Software Foundation.
#
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

import argparse
import calendar
import datetime
import errno
import getpass
import http.client
import itertools
import json
import logging
import os
import pipes
import queue
import re
import socket
import subprocess
import sys
import tempfile
import threading
import time
import urllib.error
import urllib.request

################################## Constants ###################################

NAME = 'Reflector'

URL = 'https://archlinux32.org/mirrors/status.php?json'

DISPLAY_TIME_FORMAT = '%Y-%m-%d %H:%M:%S UTC'
PARSE_TIME_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
PARSE_TIME_FORMAT_WITH_USEC = '%Y-%m-%dT%H:%M:%S.%fZ'

DB_SUBPATH = 'i686/core/core.db'

MIRROR_URL_FORMAT = '{0}{2}/{1}'
MIRRORLIST_ENTRY_FORMAT = "Server = " + MIRROR_URL_FORMAT + "\n"

DEFAULT_CONNECTION_TIMEOUT = 5
DEFAULT_CACHE_TIMEOUT = 300
DEFAULT_N_THREADS = 5

SORT_TYPES = {
  'age'    : 'last server synchronization',
  'rate'   : 'download rate',
  'country': 'server\'s location',
  'score'  : 'MirrorStatus score',
  'delay'  : 'MirrorStatus delay',
}


################################# IO Functions #################################

def get_cache_file():
  '''
  Get a nearly XDG-compliant cache directory. PyXDG is not used to  avoid the
  external dependency. It is not fully compliant because it omits the
  application name, but the mirror status file can be reused by other
  applications and this stores no other files.
  '''
  base_name = 'mirrorstatus.json'
  cache_dir = os.getenv('XDG_CACHE_HOME', default=os.path.expanduser('~/.cache'))
  try:
    os.makedirs(cache_dir, exist_ok=True)
  # Raised by makedirs if permissions do not match umask
  except FileExistsError:
    pass
  return os.path.join(cache_dir, base_name)



def get_mirrorstatus(
  connection_timeout=DEFAULT_CONNECTION_TIMEOUT,
  cache_timeout=DEFAULT_CACHE_TIMEOUT
):
  '''
  Retrieve the mirror status JSON object. The downloaded data will be cached
  locally and re-used within the cache timeout period. Returns the object and
  the local cache's modification time.
  '''
  cache_path = get_cache_file()
  try:
    mtime = os.path.getmtime(cache_path)
    invalid = (time.time() - mtime) > cache_timeout
  except FileNotFoundError:
    mtime = None
    invalid = True

  try:
    if invalid:
      with urllib.request.urlopen(URL, None, connection_timeout) as h:
        obj = json.loads(h.read().decode())
      with open(cache_path, 'w') as h:
        json.dump(obj, h, sort_keys=True, indent=2)
      mtime = time.time()
    else:
      with open(cache_path, 'r') as h:
        obj = json.load(h)

    return obj, mtime
  except (IOError, urllib.error.URLError, socket.timeout) as e:
    raise MirrorStatusError(str(e))



################################ Miscellaneous #################################

def get_logger():
  '''
  Get the logger used by this module. Use this to be sure that the right logger
  is used.
  '''
  return logging.getLogger(NAME)



def format_last_sync(mirrors):
  '''
  Parse and format the "last_sync" field.
  '''
  for m in mirrors:
    last_sync = calendar.timegm(time.strptime(m['last_sync'], PARSE_TIME_FORMAT))
    m.update(last_sync=last_sync)
    yield m



def count_countries(mirrors):
  '''
  Count the mirrors in each country.
  '''
  countries = dict()
  for m in mirrors:
    k = (m['country'], m['country_code'])
    if not any(k):
      continue
    try:
      countries[k] += 1
    except KeyError:
      countries[k] = 1
  return countries



################################### Sorting ####################################

def sort(mirrors, by=None, n_threads=DEFAULT_N_THREADS):
  '''
  Sort mirrors by different criteria.
  '''
  # Ensure that "mirrors" is a list that can be sorted.
  if not isinstance(mirrors, list):
    mirrors = list(mirrors)

  if by == 'age':
    mirrors.sort(key=lambda m: m['last_sync'], reverse=True)

  elif by == 'rate':
    rates = rate(mirrors, n_threads=n_threads)
    mirrors = sorted(mirrors, key=lambda m: rates[m['url']], reverse=True)

  else:
    try:
      mirrors.sort(key=lambda m: m[by])
    except KeyError:
      raise MirrorStatusError('attempted to sort mirrors by unrecognized criterion: "{}"'.format(by))

  return mirrors


#################################### Rating ####################################

def rate_rsync(db_url, connection_timeout=DEFAULT_CONNECTION_TIMEOUT):
  '''
  Download a database via rsync and return the time and rate of the download.
  '''
  rsync_cmd = [
    'rsync',
    '-avL', '--no-h', '--no-motd',
    '--contimeout={}'.format(connection_timeout),
    db_url
  ]
  try:
    with tempfile.TemporaryDirectory() as tmpdir:
      t0 = time.time()
      subprocess.check_call(
        rsync_cmd + [tmpdir],
        stdout=subprocess.DEVNULL,
        stderr=subprocess.DEVNULL
      )
      dt = time.time() - t0
      size = os.path.getsize(
        os.path.join(tmpdir, os.path.basename(DB_SUBPATH))
      )
      r = size / dt
      return dt, r
  except (subprocess.CalledProcessError, subprocess.TimeoutExpired, FileNotFoundError):
    return 0, 0



def rate_http(db_url, connection_timeout=DEFAULT_CONNECTION_TIMEOUT):
  '''
  Download a database via any protocol supported by urlopen and return the time
  and rate of the download.
  '''
  req = urllib.request.Request(url=db_url)
  try:
    with urllib.request.urlopen(req, None, connection_timeout) as f:
      t0 = time.time()
      size = len(f.read())
      dt = time.time() - t0
    r = size / (dt)
    return dt, r
  except (OSError, urllib.error.HTTPError, http.client.HTTPException):
    return 0, 0



def rate(mirrors, n_threads=DEFAULT_N_THREADS, connection_timeout=DEFAULT_CONNECTION_TIMEOUT):
  '''
  Rate mirrors by timing the download the core repo's database for each one.
  '''
  # Ensure that mirrors is not a generator so that its length can be determined.
  if not isinstance(mirrors, tuple):
    mirrors = tuple(mirrors)

  if not mirrors:
    return None

  # At least 1 thread and not more than the number of mirrors.
  n_threads = max(1, min(n_threads, len(mirrors)))

  # URL input queue.
  q_in = queue.Queue()
  # URL, elapsed time and rate output queue.
  q_out = queue.Queue()


  def worker():
    while True:
      # To stop a thread, an integer will be inserted in the input queue. Each
      # thread will increment it and re-insert it until it equals the
      # threadcount. After encountering the integer, the thread exits the loop.
      url = q_in.get()

      if isinstance(url, int):
        if url < n_threads:
          q_in.put(url + 1)

      else:
        db_url = url + DB_SUBPATH
        scheme = urllib.parse.urlparse(url).scheme

        if scheme == 'rsync':
          dt, r = rate_rsync(db_url, connection_timeout)
        else:
          dt, r = rate_http(db_url, connection_timeout)

        q_out.put((url, dt, r))

      q_in.task_done()


  workers = tuple(threading.Thread(target=worker) for _ in range(n_threads))
  for w in workers:
    w.daemon = True
    w.start()

  url_len = max(len(m['url']) for m in mirrors)
  logger = get_logger()
  for m in mirrors:
    url = m['url']
    logger.info("rating {}".format(url))
    q_in.put(url)

  # To exit the threads.
  q_in.put(0)
  q_in.join()

  header_fmt = '{{:{:d}s}}  {{:>14s}}  {{:>9s}}'.format(url_len)
  logger.info(header_fmt.format('Server', 'Rate', 'Time'))
  fmt = '{{:{:d}s}}  {{:8.2f}} KiB/s  {{:7.2f}} s'.format(url_len)

  # Loop over the mirrors just to ensure that we get the rate for each mirror.
  # The value in the loop does not (necessarily) correspond to the mirror.
  rates = dict()
  for _ in mirrors:
    url, dt, r = q_out.get()
    kibps = r / 1024.0
    logger.info(fmt.format(url, kibps, dt))
    rates[url] = r
    q_out.task_done()

  return rates



############################## MirrorStatusError ###############################

class MirrorStatusError(Exception):
  '''
  Common base exception raised by this module.
  '''
  def __init__(self, msg):
    self.msg = msg
  def __str__(self):
    return repr(self.msg)




############################## MirrorStatusFilter ##############################

class MirrorStatusFilter():

  def __init__(
    self,
    min_completion_pct=1.0,
    countries=None,
    protocols=None,
    include=None,
    exclude=None,
    age=None,
    isos=False,
    ipv4=False,
    ipv6=False
  ):
    self.min_completion_pct = min_completion_pct
    self.countries = tuple(c.upper() for c in countries) if countries else None
    self.protocols = protocols
    self.include = tuple(re.compile(r) for r in include) if include else None
    self.exclude = tuple(re.compile(r) for r in exclude) if exclude else None
    self.age = age
    self.isos = isos
    self.ipv4 = ipv4
    self.ipv6 = ipv6


  def filter_mirrors(self, mirrors):
    # Filter unsynced mirrors.
    mirrors = (m for m in mirrors if m['last_sync'])

    # Parse the last sync time.
    mirrors = format_last_sync(mirrors)

    # Filter by completion "percent" [0-1].
    mirrors = (m for m in mirrors if m['completion_pct'] >= self.min_completion_pct)

    # Filter by countries.
    if self.countries:
      mirrors = (
        m for m in mirrors
        if m['country'].upper() in self.countries
        or m['country_code'].upper() in self.countries
      )

    # Filter by protocols.
    if self.protocols:
      mirrors = (m for m in mirrors if m['protocol'] in self.protocols)

    # Filter by include expressions.
    if self.include:
      mirrors = (m for m in mirrors if any(r.search(m['url']) for r in self.include))

    # Filter by exclude expressions.
    if self.exclude:
      mirrors = (m for m in mirrors if not any(r.search(m['url']) for r in self.exclude))

    # Filter by age. The age is given in hours and converted to seconds. Servers
    # with a last refresh older than the age are omitted.
    if self.age and self.age > 0:
      t = time.time()
      a = self.age * 60**2
      mirrors = (m for m in mirrors if (m['last_sync'] + a) >= t)

    # The following does not work. Only the final iteration affects "mirrors".
    # TODO: Understand exactly why the code above works but the loop doesn't.
    #  for field in ('isos', 'ipv4', 'ipv6'):
    #    if getattr(self, field):
    #      mirrors = (m for m in mirrors if m[field])

    # Filter by ISO hosing.
    if self.isos:
      mirrors = (m for m in mirrors if m['isos'])

    # Filter by IPv4 support.
    if self.ipv4:
      mirrors = (m for m in mirrors if m['ipv4'])

    # Filter by IPv6 support.
    if self.ipv6:
      mirrors = (m for m in mirrors if m['ipv6'])

    yield from mirrors



################################## Formatting ##################################

def format_mirrorlist(mirror_status, mtime, include_country=False, command=None):
  if command is None:
    command = '?'
  else:
    command = 'reflector ' + ' '.join(pipes.quote(x) for x in command)

  last_check = mirror_status['last_check']
  # For some reason the "last_check" field included microseconds.
  try:
    parsed_last_check = datetime.datetime.strptime(
      last_check,
      PARSE_TIME_FORMAT_WITH_USEC,
    ).timetuple()
  except ValueError:
    parsed_last_check = datetime.datetime.strptime(
      last_check,
      PARSE_TIME_FORMAT,
    ).timetuple()

  width = 80
  colw = 11
  header = '# Arch Linux mirrorlist generated by Reflector #'.center(width, '#')
  border = '#' * len(header)
  mirrorlist = ''
  mirrorlist = '{}\n{}\n{}\n'.format(border, header, border) + \
    '\n' + \
    '\n'.join(
      '# {{:<{:d}s}} {{}}'.format(colw).format(k, v) for k, v in (
        ('With:', command),
        ('When:', time.strftime(DISPLAY_TIME_FORMAT, time.gmtime())),
        ('From:', URL),
        ('Retrieved:', time.strftime(DISPLAY_TIME_FORMAT, time.gmtime(mtime))),
        ('Last Check:', time.strftime(DISPLAY_TIME_FORMAT, parsed_last_check))
      )
    ) + \
    '\n\n'

  country = None

  mirrors = mirror_status['urls']
  for mirror in mirrors:
    # Include country tags. This is intended for lists that are sorted by
    # country.
    if include_country:
      c = '{} [{}]'.format(mirror['country'], mirror['country_code'])
      if c != country:
        if country:
          mirrorlist += '\n'
        mirrorlist += '# {}\n'.format(c)
        country = c
    mirrorlist += MIRRORLIST_ENTRY_FORMAT.format(mirror['url'], '$repo', '$arch')

  if mirrors:
    return mirrorlist
  else:
    return None





############################ MirrorStatus Retriever ############################

class MirrorStatus():
  '''
  This is a legacy class that will likely be removed in the future. It
  previously held most of this module's functionality until it was refactored
  into more modular functions. Seemingly pointless code is still used by
  importers of this module.
  '''

  # TODO: move these to another module or remove them completely
  # Related: https://bugs.archlinux.org/task/32895
  REPOSITORIES = (
    'community',
    'community-staging',
    'community-testing',
    'core',
    'extra',
    'staging',
    'testing'
  )
  # Officially supported system architectures.
  ARCHITECTURES = ['i486','i686']

  MIRROR_URL_FORMAT = MIRROR_URL_FORMAT
  MIRRORLIST_ENTRY_FORMAT = MIRRORLIST_ENTRY_FORMAT


  def __init__(
    self,
    connection_timeout=DEFAULT_CONNECTION_TIMEOUT,
    cache_timeout=DEFAULT_CACHE_TIMEOUT,
    min_completion_pct=1.0,
    threads=DEFAULT_N_THREADS
  ):
    self.connection_timeout = connection_timeout
    self.cache_timeout = cache_timeout
    self.min_completion_pct = min_completion_pct
    self.threads = threads

    self.mirror_status = None
    self.ms_mtime = 0


  def retrieve(self):
    self.mirror_status, self.ms_mtime = get_mirrorstatus(
      connection_timeout=self.connection_timeout,
      cache_timeout=self.cache_timeout
    )


  def get_obj(self):
    '''
    Get the JSON mirror status.
    '''
    t = time.time()
    if (t - self.ms_mtime) > self.cache_timeout:
      self.retrieve()
    return self.mirror_status


  def get_mirrors(self):
    '''
    Get the mirror from the mirror status.
    '''
    obj = self.get_obj()
    try:
      return obj['urls']
    except KeyError:
      raise MirrorStatusError('no mirrors detected in mirror status output')



  def filter(self, mirrors=None, **kwargs):
    '''
    Filter mirrors by various criteria.
    '''
    if mirrors is None:
      mirrors = self.get_mirrors()
    msf = MirrorStatusFilter(min_completion_pct=self.min_completion_pct, **kwargs)
    yield from msf.filter_mirrors(mirrors)



  def sort(self, mirrors=None, **kwargs):
    '''
    Sort mirrors by various criteria.
    '''
    if mirrors is None:
      mirrors = self.get_mirrors()
    yield from sort(mirrors, n_threads=self.threads, **kwargs)


  def rate(self, mirrors=None, **kwargs):
    '''
    Sort mirrors by download speed.
    '''
    if mirrors is None:
      mirrors = self.get_mirrors()
    yield from sort(mirrors, n_threads=self.threads, by='rate', **kwargs)



  def display_time(self, t=None):
    '''Format a time for display.'''
    return time.strftime(self.DISPLAY_TIME_FORMAT, t)



  def get_mirrorlist(self, mirrors=None, include_country=False, cmd=None):
    '''
    Get a Pacman-formatted mirrorlist.
    '''
    obj = self.get_obj().copy()
    if mirrors is not None:
      if not isinstance(mirrors, list):
        mirrors = list(mirrors)
      obj['urls'] = mirrors
    return format_mirrorlist(obj, self.ms_mtime, include_country=include_country, command=cmd)



  def list_countries(self):
    '''
    List countries along with a server count for each one.
    '''
    mirrors = self.get_mirrors()
    return count_countries(mirrors)



############################### argparse Actions ###############################

class ListCountries(argparse.Action):
  '''
  Action to list countries along with the number of mirrors in each.
  '''
  def __call__(self, parser, namespace, values, option_string=None):
    ms = MirrorStatus()
    countries = ms.list_countries()
    w = max(len(c) for c, cc in countries)
    n = len(str(max(countries.values())))
    fmt = '{{:{:d}s}} {{}} {{:{:d}d}}'.format(w, n)
    for (c, cc), n in sorted(countries.items(), key=lambda x: x[0][0]):
      print(fmt.format(c, cc, n))
    sys.exit(0)



def print_mirror_info(mirrors, time_fmt=DISPLAY_TIME_FORMAT):
  '''
  Print information about each mirror to STDOUT.
  '''
  if mirrors:
    #  mirrors = format_last_sync(mirrors)
    if not isinstance(mirrors, list):
      mirrors = list(mirrors)
    ks = sorted(k for k in mirrors[0].keys() if k != 'url')
    l = max(len(k) for k in ks)
    fmt = '{{:{:d}s}} : {{}}'.format(l)
    for m in mirrors:
      print('{}$arch/$repo'.format(m['url']))
      for k in ks:
        v = m[k]
        if k == 'last_sync':
          v = time.strftime(time_fmt, time.gmtime(v))
        print(fmt.format(k, v))
      print()



def add_arguments(parser):
  '''
  Add reflector arguments to the argument parser.
  '''
  parser = argparse.ArgumentParser(description='retrieve and filter a list of the latest Arch Linux mirrors')

  parser.add_argument(
    '--connection-timeout', type=int, metavar='n', default=DEFAULT_CONNECTION_TIMEOUT,
    help='The number of seconds to wait before a connection times out. Default: %(default)s'
  )

#   parser.add_argument(
#     '--download-timeout', type=int, metavar='n',
#     help='The number of seconds to wait before a download times out. The threshold is checked after each chunk is read, so the actual timeout may take longer.'
#   )

  parser.add_argument(
    '--list-countries', action=ListCountries, nargs=0,
    help='Display a table of the distribution of servers by country.'
  )

  parser.add_argument(
    '--cache-timeout', type=int, metavar='n', default=DEFAULT_CACHE_TIMEOUT,
    help='The cache timeout in seconds for the data retrieved from the Arch Linux Mirror Status API. The default is %(default)s.'
  )

  parser.add_argument(
    '--save', metavar='<filepath>',
    help='Save the mirrorlist to the given path.'
  )

  sort_help = '; '.join('"{}": {}'.format(k, v) for k, v in SORT_TYPES.items())
  parser.add_argument(
    '--sort', choices=SORT_TYPES,
    help='Sort the mirrorlist. {}.'.format(sort_help)
  )

  parser.add_argument(
    '--threads', type=int, metavar='n', default=DEFAULT_N_THREADS,
    help='The maximum number of threads to use when rating mirrors. Default: %(default)s'
  )

  parser.add_argument(
    '--verbose', action='store_true',
    help='Print extra information to STDERR. Only works with some options.'
  )

  parser.add_argument(
    '--info', action='store_true',
    help='Print mirror information instead of a mirror list. Filter options apply.'
  )



  filters = parser.add_argument_group(
    'filters',
    'The following filters are inclusive, i.e. the returned list will only contain mirrors for which all of the given conditions are met.'
  )

  filters.add_argument(
    '-a', '--age', type=float, metavar='n',
    help='Only return mirrors that have synchronized in the last n hours. n may be an integer or a decimal number.'
  )

  filters.add_argument(
    '-c', '--country', dest='countries', action='append', metavar='<country>',
    help='Match one of the given countries (case-sensitive). Use "--list-countries" to see which are available.'
  )

  filters.add_argument(
    '-f', '--fastest', type=int, metavar='n',
    help='Return the n fastest mirrors that meet the other criteria. Do not use this option without other filtering options.'
  )

  filters.add_argument(
    '-i', '--include', metavar='<regex>', action='append',
    help='Include servers that match <regex>, where <regex> is a Python regular express.'
  )

  filters.add_argument(
    '-x', '--exclude', metavar='<regex>', action='append',
    help='Exclude servers that match <regex>, where <regex> is a Python regular express.'
  )

  filters.add_argument(
    '-l', '--latest', type=int, metavar='n',
    help='Limit the list to the n most recently synchronized servers.'
  )

  filters.add_argument(
    '--score', type=int, metavar='n',
    help='Limit the list to the n servers with the highest score.'
  )

  filters.add_argument(
    '-n', '--number', type=int, metavar='n',
    help='Return at most n mirrors.'
  )

  filters.add_argument(
    '-p', '--protocol', dest='protocols', action='append', metavar='<protocol>',
    help='Match one of the given protocols, e.g. "http", "ftp".'
  )

  filters.add_argument(
    '--completion-percent', type=float, metavar='[0-100]', default=100.,
    help='Set the minimum completion percent for the returned mirrors. Check the mirrorstatus webpage for the meaning of this parameter. Default value: %(default)s.'
  )

  filters.add_argument(
    '--isos', action='store_true',
    help='Only return mirrors that host ISOs.'
  )

  filters.add_argument(
    '--ipv4', action='store_true',
    help='Only return mirrors that support IPv4.'
  )

  filters.add_argument(
    '--ipv6', action='store_true',
    help='Only return mirrors that support IPv6.'
  )

  return parser



def parse_args(args=None):
  '''
  Parse command-line arguments.
  '''
  parser = argparse.ArgumentParser(
    description='retrieve and filter a list of the latest Arch Linux mirrors'
  )
  parser = add_arguments(parser)
  options = parser.parse_args(args)
  return options



# Process options
def process_options(options, ms=None, mirrors=None):
  '''
  Process options.

  Optionally accepts a MirrorStatus object and/or the mirrors as returned by
  the MirrorStatus.get_mirrors method.
  '''
  if not ms:
    ms = MirrorStatus(
      connection_timeout=options.connection_timeout,
#       download_timeout=options.download_timeout,
      cache_timeout=options.cache_timeout,
      min_completion_pct=(options.completion_percent/100.),
      threads=options.threads
    )

  if mirrors is None:
    mirrors = ms.get_mirrors()

  # Filter
  mirrors = ms.filter(
    mirrors,
    countries=options.countries,
    include=options.include,
    exclude=options.exclude,
    age=options.age,
    protocols=options.protocols,
    isos=options.isos,
    ipv4=options.ipv4,
    ipv6=options.ipv6
  )

  if options.latest and options.latest > 0:
    mirrors = ms.sort(mirrors, by='age')
    mirrors = itertools.islice(mirrors, options.latest)

  if options.score and options.score > 0:
    mirrors = ms.sort(mirrors, by='score')
    mirrors = itertools.islice(mirrors, options.score)

  if options.fastest and options.fastest > 0:
    mirrors = ms.sort(mirrors, by='rate')
    mirrors = itertools.islice(mirrors, options.fastest)

  if options.sort and not (options.sort == 'rate' and options.fastest):
    mirrors = ms.sort(mirrors, by=options.sort)

  if options.number:
    mirrors = list(mirrors)[:options.number]

  return ms, mirrors



def main(args=None, configure_logging=False):
  if args:
    cmd = tuple(args)
  else:
    cmd = sys.argv[1:]

  options = parse_args(args)

  # Configure logging.
  logger = get_logger()

  if configure_logging:
    if options.verbose:
      level = logging.INFO
    else:
      level = logging.WARNING

    logger.setLevel(level)
    ch = logging.StreamHandler()
    formatter = logging.Formatter(
      fmt='[{asctime:s}] {levelname:s}: {message:s}',
      style='{',
      datefmt='%Y-%m-%d %H:%M:%S'
    )
    ch.setFormatter(formatter)
    logger.addHandler(ch)


  try:
    ms, mirrors = process_options(options)
    if mirrors is not None and not isinstance(mirrors, list):
      mirrors = list(mirrors)
    if not mirrors:
      sys.exit('error: no mirrors found')
    include_country = options.sort == 'country'
    # Convert the generator object to a list for re-use later.
    if options.info:
      print_mirror_info(mirrors)
      return
    else:
      mirrorlist = ms.get_mirrorlist(mirrors, include_country=include_country, cmd=cmd)
      if mirrorlist is None:
        sys.exit('error: no mirrors found')
  except MirrorStatusError as e:
    sys.exit('error: {}\n'.format(e.msg))

  if options.save:
    try:
      with open(options.save, 'w') as f:
        f.write(mirrorlist)
    except IOError as e:
      sys.exit('error: {}\n'.format(e.strerror))
  else:
    print(mirrorlist)



def run_main(args=None, **kwargs):
  try:
    main(args, **kwargs)
  except KeyboardInterrupt:
    pass


if __name__ == "__main__":
  run_main(configure_logging=True)