2 # Copyright 2014 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
13 from git_common import GIT_EXE, GIT_TRANSIENT_ERRORS_RE
16 class TeeThread(threading.Thread):
18 def __init__(self, fd, out_fd, name):
19 super(TeeThread, self).__init__(name='git-retry.tee.%s' % (name,))
28 self.out_fd.write(line)
29 self.data = ''.join(chunks)
32 class GitRetry(object):
34 logger = logging.getLogger('git-retry')
35 DEFAULT_DELAY_SECS = 3.0
36 DEFAULT_RETRY_COUNT = 5
38 def __init__(self, retry_count=None, delay=None, delay_factor=None):
39 self.retry_count = retry_count or self.DEFAULT_RETRY_COUNT
40 self.delay = max(delay, 0) if delay else 0
41 self.delay_factor = max(delay_factor, 0) if delay_factor else 0
43 def shouldRetry(self, stderr):
44 m = GIT_TRANSIENT_ERRORS_RE.search(stderr)
47 self.logger.info("Encountered known transient error: [%s]",
48 stderr[m.start(): m.end()])
53 args = (GIT_EXE,) + args
54 proc = subprocess.Popen(
56 stderr=subprocess.PIPE,
58 stderr_tee = TeeThread(proc.stderr, sys.stderr, 'stderr')
60 # Start our process. Collect/tee 'stdout' and 'stderr'.
64 except KeyboardInterrupt:
69 return proc.returncode, None, stderr_tee.data
71 def computeDelay(self, iteration):
72 """Returns: the delay (in seconds) for a given iteration
74 The first iteration has a delay of '0'.
77 iteration: (int) The iteration index (starting with zero as the first
80 if (not self.delay) or (iteration == 0):
82 if self.delay_factor == 0:
84 return iteration * self.delay
86 return (self.delay_factor ** (iteration - 1)) * self.delay
88 def __call__(self, *args):
90 for i in xrange(self.retry_count):
91 # If the previous run failed and a delay is configured, delay before the
93 delay = self.computeDelay(i)
95 self.logger.info("Delaying for [%s second(s)] until next retry", delay)
98 self.logger.debug("Executing subprocess (%d/%d) with arguments: %s",
99 (i+1), self.retry_count, args)
100 returncode, _, stderr = self.execute(*args)
102 self.logger.debug("Process terminated with return code: %d", returncode)
106 if not self.shouldRetry(stderr):
107 self.logger.error("Process failure was not known to be transient; "
108 "terminating with return code %d", returncode)
114 parser = optparse.OptionParser()
115 parser.disable_interspersed_args()
116 parser.add_option('-v', '--verbose',
117 action='count', default=0,
118 help="Increase verbosity; can be specified multiple times")
119 parser.add_option('-c', '--retry-count', metavar='COUNT',
120 type=int, default=GitRetry.DEFAULT_RETRY_COUNT,
121 help="Number of times to retry (default=%default)")
122 parser.add_option('-d', '--delay', metavar='SECONDS',
123 type=float, default=GitRetry.DEFAULT_DELAY_SECS,
124 help="Specifies the amount of time (in seconds) to wait "
125 "between successive retries (default=%default). This "
127 parser.add_option('-D', '--delay-factor', metavar='FACTOR',
129 help="The exponential factor to apply to delays in between "
130 "successive failures (default=%default). If this is "
131 "zero, delays will increase linearly. Set this to "
132 "one to have a constant (non-increasing) delay.")
134 opts, args = parser.parse_args(args)
136 # Configure logging verbosity
137 if opts.verbose == 0:
138 logging.getLogger().setLevel(logging.WARNING)
139 elif opts.verbose == 1:
140 logging.getLogger().setLevel(logging.INFO)
142 logging.getLogger().setLevel(logging.DEBUG)
146 retry_count=opts.retry_count,
148 delay_factor=opts.delay_factor,
153 if __name__ == '__main__':
154 logging.basicConfig()
155 logging.getLogger().setLevel(logging.WARNING)
156 sys.exit(main(sys.argv[2:]))