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#!/usr/bin/python3
# Copyright 2017 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import json
import os
import time
import cliapp
import requests
import ick2
class WorkerManager(cliapp.Application):
def add_settings(self):
self.settings.boolean(
['pretend'],
'only pretend to execute shell steps',
)
self.settings.string(
['controller'],
'base URL for the controller',
metavar='URL',
)
self.settings.string(
['name'],
'name of this worker',
metavar='URL',
)
self.settings.integer(
['sleep'],
'sleep for SECS seconds if there is no work currently',
metavar='SECS',
default=5,
)
def process_args(self, args):
self.settings.require('name')
name = self.settings['name']
url = self.settings['controller']
print('Worker manager {} starts, controller is {}'.format(name, url))
while True:
work = self.get_work(url, name)
if work and self.settings['pretend']:
self.report_pretend_work(url, name, work)
elif work:
self.do_work(url, name, work)
else:
self.sleep_a_little()
def sleep_a_little(self):
secs = self.settings['sleep']
print('Sleeping for {} seconds'.format(secs))
time.sleep(secs)
def get_work(self, url, name):
get_work_url = '{}/worker/{}'.format(url, name)
print('Getting work from {}'.format(get_work_url))
r = requests.get(get_work_url)
if r.status_code != 200 or not r.text:
return None
print('Response: {!r}'.format(r.text))
return r.json()
def report_pretend_work(self, url, name, work):
print('Pretending to work: {!r}'.format(work))
snippet_url = '{}/worker/{}/snippet'.format(url, name)
snippet = {
'project': work['project'],
'stdout': 'pretending: {}'.format(work['shell']),
'stderr': '',
'exit-code': 0,
}
self.post_snippet(snippet_url, snippet)
def do_work(self, url, name, work):
print('Doing work: {!r}'.format(work))
snippet_url = '{}/worker/{}/snippet'.format(url, name)
snippet = {
'project': work['project'],
'stdout': '',
'stderr': '',
'exit-code': None,
}
def post(stream_name, data):
print('{}: {!r}'.format(stream_name, data))
s = dict(snippet)
s[stream_name] = data
self.post_snippet(snippet_url, s)
env = dict(os.environ)
env['ICK_URL'] = work['git']
exit_code, _, _ = cliapp.runcmd_unchecked(
['bash', '-xeuc', work['shell']],
stdout_callback=lambda data: post('stdout', data),
stderr_callback=lambda data: post('stderr', data),
env=env,
)
end_snippet = dict(snippet)
end_snippet['exit-code'] = exit_code
self.post_snippet(snippet_url, end_snippet)
def post_snippet(self, url, snippet):
headers = {
'Content-Type': 'application/json',
}
print('POST {} {!r}'.format(url, snippet))
r = requests.post(url, headers=headers, data=json.dumps(snippet))
if not r.ok:
raise cliapp.AppException(
'Error posting data to controller: {} {!r}'.format(
r.status_code, r.text))
WorkerManager(version=ick2.__version__).run()
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