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#!/usr/bin/python
# Copyright 2013 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
import cliapp
import logging
import os
import time
import sys
import ttystatus
import yaml
__version__ = '0.0'
class DesktopCronish(cliapp.Application):
def add_settings(self):
self.settings.integer(
['max-jobs'],
'run at least N jobs, then quit (use 0 for infinite)',
metavar='N',
default=0)
self.settings.boolean(
['quiet', 'q'],
'no status messaging to terminal')
def process_args(self, args):
self.ts = ttystatus.TerminalStatus(period=0.1)
self.ts.format('%String(timestamp) %String(msg)')
if self.settings['quiet']:
self.ts.disable()
self.jobs = {}
self.previously = {}
self.process_inputs(args)
self.execute_jobs()
self.ts.finish()
def status(self, msg):
logging.info(msg)
self.ts['timestamp'] = time.strftime('%H:%M:%S')
self.ts['msg'] = ' '.join(msg.split('\n'))
self.ts.flush()
def process_input(self, filename):
self.status('Loading jobs from %s' % filename)
with self.open_input(filename, 'r') as f:
job_dict = yaml.safe_load(f)
self.jobs.update(job_dict)
def execute_jobs(self):
n = 0
max_jobs = self.settings['max-jobs']
while max_jobs == 0 or n < max_jobs:
job_name, when = self.choose_job()
self.wait_until(when, job_name)
self.execute_job(job_name)
n += 1
self.status('Stopped executing after %d jobs' % n)
def choose_job(self):
next_job_name = None
next_when = 0
for job_name, job in self.jobs.items():
if 'interval' in job:
job_when = self.when_interval_job(job_name, job)
elif 'trigger-file' in job:
job_when = self.when_trigger_file_job(job_name, job)
else:
raise cliapp.AppException(
'Unknown job trigger for %s' % job_name)
if next_job_name is None or job_when <= next_when:
next_job_name = job_name
next_when = job_when
return next_job_name, next_when
def when_interval_job(self, job_name, job):
return self.previously.get(job_name, 0) + job['interval']
def when_trigger_file_job(self, job_name, job):
filename = job['trigger-file']
# If file doesn't exist, trigger now.
if not os.path.exists(filename):
return self.now()
# If there is no max age for file, but it exists, never trigger.
if 'trigger-age' not in job:
return -1
mtime = os.path.getmtime(filename)
return mtime + job['trigger-age']
def wait_until(self, when, for_what):
while self.now() < when:
seconds = when - self.now()
t = time.strftime('%H:%M:%S', time.localtime(when))
self.status('Sleeping until %s for %s' % (t, for_what))
time.sleep(seconds)
def execute_job(self, job_name):
job = self.jobs[job_name]
self.ts.notify('Executing job %s' % job_name)
self.status('Started command: %s' % job['command'])
argv = ['sh', '-c', job['command']]
if 'timeout' in job:
argv = ['timeout', str(job['timeout'])] + argv
exit, out, err = cliapp.runcmd_unchecked(argv)
if out.endswith('\n'):
out = out[:-1]
if out:
self.ts.notify(out)
if exit != 0:
self.ts.error(
'ERROR: Job %s: Command failed: %s' %
(job_name, job['command']))
if err:
self.ts.error(err)
self.previously[job_name] = self.now()
def now(self):
return time.time()
DesktopCronish(version=__version__).run()
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