| 1 | # -*- coding: utf-8 -*- |
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| 2 | # vim: set ts=4 sw=4 et ai: |
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| 3 | |
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| 4 | """ |
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| 5 | | This file is part of the web2py Web Framework |
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| 6 | | Created by Attila Csipa <web2py@csipa.in.rs> |
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| 7 | | Modified by Massimo Di Pierro <mdipierro@cs.depaul.edu> |
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| 8 | | Worker, SoftWorker and SimplePool added by Paolo Pastori |
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| 9 | | License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html) |
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| 10 | |
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| 11 | Cron-style interface |
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| 12 | """ |
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| 13 | |
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| 14 | import threading |
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| 15 | import os |
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| 16 | from logging import getLogger |
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| 17 | import time |
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| 18 | import sched |
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| 19 | import sys |
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| 20 | import re |
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| 21 | from functools import reduce |
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| 22 | import datetime |
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| 23 | import shlex |
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| 24 | |
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| 25 | from gluon import fileutils |
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| 26 | from gluon._compat import to_bytes, pickle |
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| 27 | from pydal.contrib import portalocker |
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| 28 | |
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| 29 | logger_name = 'web2py.cron' |
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| 30 | |
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| 31 | |
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| 32 | _stopping = False |
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| 33 | |
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| 34 | def reset(): |
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| 35 | global _stopping |
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| 36 | _stopping = False |
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| 37 | |
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| 38 | |
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| 39 | _subprocs_lock = threading.RLock() |
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| 40 | _subprocs = [] |
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| 41 | |
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| 42 | def subprocess_count(): |
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| 43 | with _subprocs_lock: |
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| 44 | return len(_subprocs) |
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| 45 | |
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| 46 | |
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| 47 | def absolute_path_link(path): |
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| 48 | """ |
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| 49 | Returns an absolute path for the destination of a symlink |
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| 50 | """ |
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| 51 | if os.path.islink(path): |
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| 52 | link = os.readlink(path) |
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| 53 | if not os.path.isabs(link): |
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| 54 | link = os.path.join(os.path.dirname(path), link) |
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| 55 | else: |
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| 56 | link = os.path.abspath(path) |
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| 57 | return link |
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| 58 | |
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| 59 | |
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| 60 | def stopcron(): |
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| 61 | """Graceful shutdown of cron""" |
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| 62 | global _stopping |
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| 63 | _stopping = True |
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| 64 | while subprocess_count(): |
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| 65 | with _subprocs_lock: |
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| 66 | proc = _subprocs.pop() |
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| 67 | if proc.poll() is None: |
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| 68 | try: |
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| 69 | proc.terminate() |
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| 70 | except Exception: |
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| 71 | getLogger(logger_name).exception('error in stopcron') |
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| 72 | |
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| 73 | |
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| 74 | def extcron(applications_parent, apps=None): |
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| 75 | getLogger(logger_name).debug('external cron invocation') |
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| 76 | crondance(applications_parent, 'external', startup=False, apps=apps) |
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| 77 | |
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| 78 | |
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| 79 | class hardcron(threading.Thread): |
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| 80 | |
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| 81 | def __init__(self, applications_parent, apps=None): |
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| 82 | threading.Thread.__init__(self) |
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| 83 | self.setDaemon(True) |
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| 84 | self.path = applications_parent |
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| 85 | self.apps = apps |
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| 86 | # processing of '@reboot' entries in crontab (startup=True) |
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| 87 | getLogger(logger_name).info('hard cron bootstrap') |
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| 88 | crondance(self.path, 'hard', startup=True, apps=self.apps) |
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| 89 | |
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| 90 | def launch(self): |
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| 91 | if not _stopping: |
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| 92 | self.logger.debug('hard cron invocation') |
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| 93 | crondance(self.path, 'hard', startup=False, apps=self.apps) |
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| 94 | |
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| 95 | def run(self): |
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| 96 | self.logger = getLogger(logger_name) |
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| 97 | self.logger.info('hard cron daemon started') |
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| 98 | s = sched.scheduler(time.time, time.sleep) |
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| 99 | while not _stopping: |
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| 100 | now = time.time() |
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| 101 | s.enter(60 - now % 60, 1, self.launch, ()) |
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| 102 | s.run() |
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| 103 | |
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| 104 | |
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| 105 | def softcron(applications_parent, apps=None): |
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| 106 | logger = getLogger(logger_name) |
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| 107 | try: |
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| 108 | if not _dancer((applications_parent, apps)): |
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| 109 | logger.warning('no thread available for soft crondance') |
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| 110 | except Exception: |
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| 111 | logger.exception('error executing soft crondance') |
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| 112 | |
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| 113 | |
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| 114 | class Token(object): |
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| 115 | |
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| 116 | def __init__(self, path): |
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| 117 | self.path = os.path.join(path, 'cron.master') |
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| 118 | if not os.path.exists(self.path): |
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| 119 | fileutils.write_file(self.path, to_bytes(''), 'wb') |
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| 120 | self.master = None |
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| 121 | self.now = time.time() |
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| 122 | self.logger = getLogger(logger_name) |
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| 123 | |
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| 124 | def acquire(self, startup=False): |
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| 125 | """ |
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| 126 | Returns the time when the lock is acquired or |
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| 127 | None if cron already running |
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| 128 | |
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| 129 | lock is implemented by writing a pickle (start, stop) in cron.master |
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| 130 | start is time when cron job starts and stop is time when cron completed |
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| 131 | stop == 0 if job started but did not yet complete |
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| 132 | if a cron job started within less than 60 seconds, acquire returns None |
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| 133 | if a cron job started before 60 seconds and did not stop, |
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| 134 | a warning is issued ("Stale cron.master detected") |
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| 135 | """ |
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| 136 | if sys.platform == 'win32': |
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| 137 | locktime = 59.5 |
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| 138 | else: |
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| 139 | locktime = 59.99 |
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| 140 | if portalocker.LOCK_EX is None: |
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| 141 | self.logger.warning('cron disabled because no file locking') |
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| 142 | return None |
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| 143 | self.master = fileutils.open_file(self.path, 'rb+') |
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| 144 | ret = None |
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| 145 | try: |
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| 146 | portalocker.lock(self.master, portalocker.LOCK_EX) |
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| 147 | try: |
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| 148 | (start, stop) = pickle.load(self.master) |
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| 149 | except: |
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| 150 | start = 0 |
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| 151 | stop = 1 |
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| 152 | if startup or self.now - start > locktime: |
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| 153 | ret = self.now |
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| 154 | if not stop: |
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| 155 | # this happens if previous cron job longer than 1 minute |
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| 156 | self.logger.warning('stale cron.master detected') |
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| 157 | self.logger.debug('acquiring lock') |
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| 158 | self.master.seek(0) |
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| 159 | pickle.dump((self.now, 0), self.master) |
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| 160 | self.master.flush() |
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| 161 | finally: |
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| 162 | portalocker.unlock(self.master) |
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| 163 | if not ret: |
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| 164 | # do this so no need to release |
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| 165 | self.master.close() |
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| 166 | return ret |
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| 167 | |
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| 168 | def release(self): |
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| 169 | """ |
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| 170 | Writes into cron.master the time when cron job was completed |
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| 171 | """ |
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| 172 | ret = self.master.closed |
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| 173 | if not self.master.closed: |
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| 174 | portalocker.lock(self.master, portalocker.LOCK_EX) |
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| 175 | self.logger.debug('releasing cron lock') |
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| 176 | self.master.seek(0) |
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| 177 | (start, stop) = pickle.load(self.master) |
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| 178 | if start == self.now: # if this is my lock |
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| 179 | self.master.seek(0) |
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| 180 | pickle.dump((self.now, time.time()), self.master) |
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| 181 | portalocker.unlock(self.master) |
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| 182 | self.master.close() |
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| 183 | return ret |
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| 184 | |
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| 185 | |
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| 186 | def rangetolist(s, period='min'): |
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| 187 | retval = [] |
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| 188 | if s.startswith('*'): |
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| 189 | if period == 'min': |
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| 190 | s = s.replace('*', '0-59', 1) |
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| 191 | elif period == 'hr': |
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| 192 | s = s.replace('*', '0-23', 1) |
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| 193 | elif period == 'dom': |
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| 194 | s = s.replace('*', '1-31', 1) |
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| 195 | elif period == 'mon': |
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| 196 | s = s.replace('*', '1-12', 1) |
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| 197 | elif period == 'dow': |
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| 198 | s = s.replace('*', '0-6', 1) |
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| 199 | match = re.match(r'(\d+)-(\d+)/(\d+)', s) |
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| 200 | if match: |
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| 201 | for i in range(int(match.group(1)), int(match.group(2)) + 1): |
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| 202 | if i % int(match.group(3)) == 0: |
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| 203 | retval.append(i) |
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| 204 | return retval |
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| 205 | |
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| 206 | |
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| 207 | def parsecronline(line): |
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| 208 | task = {} |
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| 209 | if line.startswith('@reboot'): |
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| 210 | line = line.replace('@reboot', '-1 * * * *') |
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| 211 | elif line.startswith('@yearly'): |
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| 212 | line = line.replace('@yearly', '0 0 1 1 *') |
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| 213 | elif line.startswith('@annually'): |
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| 214 | line = line.replace('@annually', '0 0 1 1 *') |
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| 215 | elif line.startswith('@monthly'): |
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| 216 | line = line.replace('@monthly', '0 0 1 * *') |
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| 217 | elif line.startswith('@weekly'): |
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| 218 | line = line.replace('@weekly', '0 0 * * 0') |
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| 219 | elif line.startswith('@daily'): |
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| 220 | line = line.replace('@daily', '0 0 * * *') |
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| 221 | elif line.startswith('@midnight'): |
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| 222 | line = line.replace('@midnight', '0 0 * * *') |
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| 223 | elif line.startswith('@hourly'): |
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| 224 | line = line.replace('@hourly', '0 * * * *') |
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| 225 | params = line.strip().split(None, 6) |
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| 226 | if len(params) < 7: |
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| 227 | return None |
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| 228 | daysofweek = {'sun': 0, 'mon': 1, 'tue': 2, 'wed': 3, |
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| 229 | 'thu': 4, 'fri': 5, 'sat': 6} |
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| 230 | for (s, id) in zip(params[:5], ['min', 'hr', 'dom', 'mon', 'dow']): |
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| 231 | if not s in [None, '*']: |
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| 232 | task[id] = [] |
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| 233 | vals = s.split(',') |
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| 234 | for val in vals: |
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| 235 | if val != '-1' and '-' in val and '/' not in val: |
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| 236 | val = '%s/1' % val |
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| 237 | if '/' in val: |
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| 238 | task[id] += rangetolist(val, id) |
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| 239 | elif val.isdigit() or val == '-1': |
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| 240 | task[id].append(int(val)) |
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| 241 | elif id == 'dow' and val[:3].lower() in daysofweek: |
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| 242 | task[id].append(daysofweek[val[:3].lower()]) |
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| 243 | task['user'] = params[5] |
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| 244 | task['cmd'] = params[6] |
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| 245 | return task |
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| 246 | |
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| 247 | |
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| 248 | class Worker(threading.Thread): |
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| 249 | |
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| 250 | def __init__(self, pool): |
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| 251 | threading.Thread.__init__(self) |
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| 252 | self.setDaemon(True) |
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| 253 | self.pool = pool |
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| 254 | self.run_lock = threading.Lock() |
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| 255 | self.run_lock.acquire() |
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| 256 | self.payload = None |
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| 257 | |
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| 258 | def run(self): |
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| 259 | logger = getLogger(logger_name) |
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| 260 | logger.info('Worker %s: started', self.name) |
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| 261 | while True: |
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| 262 | try: |
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| 263 | with self.run_lock: # waiting for run_lock.release() |
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| 264 | cmd = ' '.join(self.payload) |
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| 265 | logger.debug('Worker %s: now calling %r', self.name, cmd) |
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| 266 | import subprocess |
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| 267 | proc = subprocess.Popen(self.payload, |
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| 268 | stdin=subprocess.PIPE, |
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| 269 | stdout=subprocess.PIPE, |
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| 270 | stderr=subprocess.PIPE) |
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| 271 | with _subprocs_lock: |
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| 272 | _subprocs.append(proc) |
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| 273 | stdoutdata, stderrdata = proc.communicate() |
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| 274 | try: |
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| 275 | with _subprocs_lock: |
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| 276 | _subprocs.remove(proc) |
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| 277 | except ValueError: |
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| 278 | pass |
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| 279 | if proc.returncode != 0: |
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| 280 | logger.warning('Worker %s: %r call returned code %s:\n%s\n%s', |
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| 281 | self.name, cmd, proc.returncode, stdoutdata, stderrdata) |
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| 282 | else: |
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| 283 | logger.debug('Worker %s: %r call returned success:\n%s', |
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| 284 | self.name, cmd, stdoutdata) |
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| 285 | finally: |
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| 286 | self.run_lock.acquire() |
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| 287 | self.pool.stop(self) |
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| 288 | |
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| 289 | |
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| 290 | class SoftWorker(threading.Thread): |
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| 291 | |
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| 292 | def __init__(self, pool): |
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| 293 | threading.Thread.__init__(self) |
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| 294 | self.setDaemon(True) |
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| 295 | self.pool = pool |
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| 296 | self.run_lock = threading.Lock() |
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| 297 | self.run_lock.acquire() |
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| 298 | self.payload = None |
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| 299 | |
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| 300 | def run(self): |
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| 301 | logger = getLogger(logger_name) |
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| 302 | logger.info('SoftWorker %s: started', self.name) |
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| 303 | while True: |
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| 304 | try: |
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| 305 | with self.run_lock: # waiting for run_lock.release() |
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| 306 | getLogger(logger_name).debug('soft cron invocation') |
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| 307 | applications_parent, apps = self.payload |
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| 308 | crondance(applications_parent, 'soft', startup=False, apps=apps) |
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| 309 | finally: |
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| 310 | self.run_lock.acquire() |
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| 311 | self.pool.stop(self) |
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| 312 | |
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| 313 | |
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| 314 | class SimplePool(object): |
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| 315 | """ |
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| 316 | Very simple thread pool, |
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| 317 | (re)uses a maximum number of threads to launch cron tasks. |
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| 318 | |
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| 319 | Pool size can be incremented after initialization, |
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| 320 | this allows delayed configuration of a global instance |
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| 321 | for the case you do not want to use lazy initialization. |
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| 322 | """ |
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| 323 | |
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| 324 | def __init__(self, size, worker_cls=Worker): |
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| 325 | """ |
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| 326 | Create the pool setting initial size. |
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| 327 | |
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| 328 | Notice that no thread is created until the instance is called. |
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| 329 | """ |
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| 330 | self.size = size |
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| 331 | self.worker_cls = worker_cls |
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| 332 | self.lock = threading.RLock() |
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| 333 | self.idle = list() |
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| 334 | self.running = set() |
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| 335 | |
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| 336 | def grow(self, size): |
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| 337 | if size and size > self.size: |
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| 338 | self.size = size |
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| 339 | |
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| 340 | def start(self, t): |
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| 341 | with self.lock: |
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| 342 | try: |
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| 343 | self.idle.remove(t) |
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| 344 | except ValueError: |
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| 345 | pass |
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| 346 | self.running.add(t) |
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| 347 | |
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| 348 | def stop(self, t): |
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| 349 | with self.lock: |
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| 350 | self.idle.append(t) |
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| 351 | try: |
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| 352 | self.running.remove(t) |
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| 353 | except KeyError: |
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| 354 | pass |
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| 355 | |
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| 356 | def __call__(self, payload): |
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| 357 | """ |
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| 358 | Pass payload to a thread for immediate execution. |
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| 359 | |
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| 360 | Returns a boolean indicating if a thread is available. |
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| 361 | """ |
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| 362 | with self.lock: |
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| 363 | if len(self.running) == self.size: |
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| 364 | # no worker available |
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| 365 | return False |
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| 366 | idle_num = len(self.idle) |
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| 367 | if idle_num: |
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| 368 | # use an existing (idle) thread |
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| 369 | t = self.idle.pop(0) |
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| 370 | else: |
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| 371 | # create a new thread |
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| 372 | t = self.worker_cls(self) |
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| 373 | self.start(t) |
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| 374 | t.payload = payload |
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| 375 | t.run_lock.release() |
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| 376 | if not idle_num: |
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| 377 | t.start() |
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| 378 | return True |
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| 379 | |
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| 380 | |
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| 381 | _dancer = SimplePool(5, worker_cls=SoftWorker) |
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| 382 | |
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| 383 | def dancer_size(size): |
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| 384 | _dancer.grow(size) |
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| 385 | |
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| 386 | _launcher = SimplePool(5) |
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| 387 | |
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| 388 | def launcher_size(size): |
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| 389 | _launcher.grow(size) |
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| 390 | |
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| 391 | def crondance(applications_parent, ctype='hard', startup=False, apps=None): |
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| 392 | """ |
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| 393 | Does the periodic job of cron service: read the crontab(s) and launch |
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| 394 | the various commands. |
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| 395 | """ |
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| 396 | apppath = os.path.join(applications_parent, 'applications') |
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| 397 | token = Token(applications_parent) |
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| 398 | cronmaster = token.acquire(startup=startup) |
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| 399 | if not cronmaster: |
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| 400 | return |
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| 401 | try: |
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| 402 | now_s = time.localtime() |
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| 403 | checks = (('min', now_s.tm_min), |
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| 404 | ('hr', now_s.tm_hour), |
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| 405 | ('mon', now_s.tm_mon), |
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| 406 | ('dom', now_s.tm_mday), |
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| 407 | ('dow', (now_s.tm_wday + 1) % 7)) |
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| 408 | logger = getLogger(logger_name) |
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| 409 | |
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| 410 | if not apps: |
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| 411 | apps = [x for x in os.listdir(apppath) |
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| 412 | if os.path.isdir(os.path.join(apppath, x))] |
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| 413 | |
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| 414 | full_apath_links = set() |
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| 415 | |
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| 416 | if sys.executable.lower().endswith('pythonservice.exe'): |
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| 417 | _python_exe = os.path.join(sys.exec_prefix, 'python.exe') |
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| 418 | else: |
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| 419 | _python_exe = sys.executable |
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| 420 | base_commands = [_python_exe] |
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| 421 | w2p_path = fileutils.abspath('web2py.py', gluon=True) |
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| 422 | if os.path.exists(w2p_path): |
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| 423 | base_commands.append(w2p_path) |
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| 424 | base_commands.extend(('--cron_job', '--no_banner', '--no_gui', '--plain')) |
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| 425 | |
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| 426 | for app in apps: |
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| 427 | if _stopping: |
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| 428 | break |
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| 429 | apath = os.path.join(apppath, app) |
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| 430 | |
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| 431 | # if app is a symbolic link to other app, skip it |
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| 432 | full_apath_link = absolute_path_link(apath) |
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| 433 | if full_apath_link in full_apath_links: |
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| 434 | continue |
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| 435 | else: |
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| 436 | full_apath_links.add(full_apath_link) |
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| 437 | |
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| 438 | cronpath = os.path.join(apath, 'cron') |
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| 439 | crontab = os.path.join(cronpath, 'crontab') |
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| 440 | if not os.path.exists(crontab): |
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| 441 | continue |
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| 442 | try: |
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| 443 | cronlines = [line.strip() for line in fileutils.readlines_file(crontab, 'rt')] |
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| 444 | lines = [line for line in cronlines if line and not line.startswith('#')] |
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| 445 | tasks = [parsecronline(cline) for cline in lines] |
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| 446 | except Exception as e: |
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| 447 | logger.error('crontab read error %s', e) |
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| 448 | continue |
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| 449 | |
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| 450 | for task in tasks: |
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| 451 | if _stopping: |
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| 452 | break |
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| 453 | if not task: |
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| 454 | continue |
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| 455 | task_min = task.get('min', []) |
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| 456 | if not startup and task_min == [-1]: |
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| 457 | continue |
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| 458 | citems = [(k in task and not v in task[k]) for k, v in checks] |
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| 459 | if task_min != [-1] and reduce(lambda a, b: a or b, citems): |
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| 460 | continue |
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| 461 | |
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| 462 | logger.info('%s cron: %s executing %r in %s at %s', |
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| 463 | ctype, app, task.get('cmd'), |
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| 464 | os.getcwd(), datetime.datetime.now()) |
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| 465 | action = models = False |
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| 466 | command = task['cmd'] |
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| 467 | if command.startswith('**'): |
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| 468 | action = True |
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| 469 | command = command[2:] |
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| 470 | elif command.startswith('*'): |
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| 471 | action = models = True |
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| 472 | command = command[1:] |
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| 473 | |
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| 474 | if action: |
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| 475 | commands = base_commands[:] |
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| 476 | if command.endswith('.py'): |
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| 477 | commands.extend(('-S', app, '-R', command)) |
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| 478 | else: |
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| 479 | commands.extend(('-S', app + '/' + command)) |
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| 480 | if models: |
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| 481 | commands.append('-M') |
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| 482 | else: |
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| 483 | commands = shlex.split(command) |
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| 484 | |
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| 485 | try: |
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| 486 | if not _launcher(commands): |
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| 487 | logger.warning('no thread available, cannot execute %r', task['cmd']) |
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| 488 | except Exception: |
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| 489 | logger.exception('error executing %r', task['cmd']) |
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| 490 | finally: |
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| 491 | token.release() |
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