Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 1 | """Run a group of subprocesses and then finish.""" |
| 2 | |
| 3 | import multiprocessing |
| 4 | import random |
| 5 | import subprocess |
| 6 | import sys |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 7 | import tempfile |
| 8 | import time |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 9 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 10 | |
Craig Tiller | 738c334 | 2015-01-12 14:28:33 -0800 | [diff] [blame^] | 11 | _MAX_JOBS = 3 |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 12 | |
| 13 | |
| 14 | def shuffle_iteratable(it): |
| 15 | """Return an iterable that randomly walks it""" |
| 16 | # take a random sampling from the passed in iterable |
| 17 | # we take an element with probablity 1/p and rapidly increase |
| 18 | # p as we take elements - this gives us a somewhat random set of values before |
| 19 | # we've seen all the values, but starts producing values without having to |
| 20 | # compute ALL of them at once, allowing tests to start a little earlier |
| 21 | nextit = [] |
| 22 | p = 1 |
| 23 | for val in it: |
| 24 | if random.randint(0, p) == 0: |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 25 | p = min(p*2, 100) |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 26 | yield val |
| 27 | else: |
| 28 | nextit.append(val) |
| 29 | # after taking a random sampling, we shuffle the rest of the elements and |
| 30 | # yield them |
| 31 | random.shuffle(nextit) |
| 32 | for val in nextit: |
| 33 | yield val |
| 34 | |
| 35 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 36 | _SUCCESS = object() |
| 37 | _FAILURE = object() |
| 38 | _RUNNING = object() |
| 39 | _KILLED = object() |
| 40 | |
| 41 | |
Craig Tiller | 3b08306 | 2015-01-12 13:51:28 -0800 | [diff] [blame] | 42 | _COLORS = { |
| 43 | 'red': 31, |
| 44 | 'green': 32, |
| 45 | 'yellow': 33, |
| 46 | } |
| 47 | |
| 48 | |
| 49 | _BEGINNING_OF_LINE = '\x1b[0G' |
| 50 | _CLEAR_LINE = '\x1b[2K' |
| 51 | |
| 52 | |
| 53 | _TAG_COLOR = { |
| 54 | 'FAILED': 'red', |
| 55 | 'PASSED': 'green', |
| 56 | 'START': 'yellow', |
| 57 | 'WAITING': 'yellow', |
| 58 | } |
| 59 | |
| 60 | |
| 61 | def message(tag, message, explanatory_text=None): |
| 62 | sys.stdout.write('%s%s\x1b[%dm%s\x1b[0m: %s%s' % ( |
| 63 | _BEGINNING_OF_LINE, |
| 64 | _CLEAR_LINE, |
| 65 | _COLORS[_TAG_COLOR[tag]], |
| 66 | tag, |
| 67 | message, |
| 68 | '\n%s\n' % explanatory_text if explanatory_text is not None else '')) |
| 69 | sys.stdout.flush() |
| 70 | |
| 71 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 72 | class Job(object): |
| 73 | """Manages one job.""" |
| 74 | |
| 75 | def __init__(self, cmdline): |
| 76 | self._cmdline = ' '.join(cmdline) |
| 77 | self._tempfile = tempfile.TemporaryFile() |
| 78 | self._process = subprocess.Popen(args=cmdline, |
| 79 | stderr=subprocess.STDOUT, |
| 80 | stdout=self._tempfile) |
| 81 | self._state = _RUNNING |
Craig Tiller | 3b08306 | 2015-01-12 13:51:28 -0800 | [diff] [blame] | 82 | message('START', self._cmdline) |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 83 | |
| 84 | def state(self): |
| 85 | """Poll current state of the job. Prints messages at completion.""" |
| 86 | if self._state == _RUNNING and self._process.poll() is not None: |
| 87 | if self._process.returncode != 0: |
| 88 | self._state = _FAILURE |
| 89 | self._tempfile.seek(0) |
| 90 | stdout = self._tempfile.read() |
Craig Tiller | 3b08306 | 2015-01-12 13:51:28 -0800 | [diff] [blame] | 91 | message('FAILED', '%s [ret=%d]' % (self._cmdline, self._process.returncode), stdout) |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 92 | else: |
| 93 | self._state = _SUCCESS |
Craig Tiller | 3b08306 | 2015-01-12 13:51:28 -0800 | [diff] [blame] | 94 | message('PASSED', '%s' % self._cmdline) |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 95 | return self._state |
| 96 | |
| 97 | def kill(self): |
| 98 | if self._state == _RUNNING: |
| 99 | self._state = _KILLED |
| 100 | self._process.terminate() |
| 101 | |
| 102 | |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 103 | class Jobset(object): |
| 104 | """Manages one run of jobs.""" |
| 105 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 106 | def __init__(self, check_cancelled): |
| 107 | self._running = set() |
| 108 | self._check_cancelled = check_cancelled |
| 109 | self._cancelled = False |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 110 | self._failures = 0 |
Craig Tiller | 738c334 | 2015-01-12 14:28:33 -0800 | [diff] [blame^] | 111 | self._completed = 0 |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 112 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 113 | def start(self, cmdline): |
| 114 | """Start a job. Return True on success, False on failure.""" |
| 115 | while len(self._running) >= _MAX_JOBS: |
| 116 | if self.cancelled(): return False |
| 117 | self.reap() |
| 118 | if self.cancelled(): return False |
| 119 | self._running.add(Job(cmdline)) |
| 120 | return True |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 121 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 122 | def reap(self): |
| 123 | """Collect the dead jobs.""" |
| 124 | while self._running: |
| 125 | dead = set() |
| 126 | for job in self._running: |
| 127 | st = job.state() |
| 128 | if st == _RUNNING: continue |
| 129 | if st == _FAILURE: self._failures += 1 |
| 130 | dead.add(job) |
| 131 | for job in dead: |
Craig Tiller | 738c334 | 2015-01-12 14:28:33 -0800 | [diff] [blame^] | 132 | self._completed += 1 |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 133 | self._running.remove(job) |
Craig Tiller | 3b08306 | 2015-01-12 13:51:28 -0800 | [diff] [blame] | 134 | if dead: return |
Craig Tiller | 738c334 | 2015-01-12 14:28:33 -0800 | [diff] [blame^] | 135 | message('WAITING', '%d jobs running, %d complete' % ( |
| 136 | len(self._running), self._completed)) |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 137 | time.sleep(0.1) |
| 138 | |
| 139 | def cancelled(self): |
| 140 | """Poll for cancellation.""" |
| 141 | if self._cancelled: return True |
| 142 | if not self._check_cancelled(): return False |
| 143 | for job in self._running: |
| 144 | job.kill() |
| 145 | self._cancelled = True |
| 146 | return True |
| 147 | |
| 148 | def finish(self): |
| 149 | while self._running: |
| 150 | if self.cancelled(): pass # poll cancellation |
| 151 | self.reap() |
| 152 | return not self.cancelled() and self._failures == 0 |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 153 | |
| 154 | |
ctiller | 3040cb7 | 2015-01-07 12:13:17 -0800 | [diff] [blame] | 155 | def _never_cancelled(): |
| 156 | return False |
| 157 | |
| 158 | |
| 159 | def run(cmdlines, check_cancelled=_never_cancelled): |
| 160 | js = Jobset(check_cancelled) |
| 161 | for cmdline in shuffle_iteratable(cmdlines): |
| 162 | if not js.start(cmdline): |
| 163 | break |
| 164 | return js.finish() |
Nicolas Noble | ddef246 | 2015-01-06 18:08:25 -0800 | [diff] [blame] | 165 | |