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#!/usr/bin/env python
#
# Copyright (C) 2013 Codethink Limited
#
# 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; version 2 of the License.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import cliapp
import logging
import os
import time
import re
import urllib2
from lorrycontroller.confparser import LorryControllerConfig
from lorrycontroller.workingstate import WorkingStateManager
from lorrycontroller.htmlstatus import HTMLStatusManager
defaults = {
'work-area': '/home/lorry/controller-area',
'config-name': 'lorry-controller.conf',
'lorry': 'lorry',
}
token_finder = re.compile("([0-9a-f]{40})")
class LorryController(cliapp.Application):
def add_settings(self):
self.settings.string(['work-area'],
'path to the area for the controller to work in',
metavar='PATH',
default=defaults['work-area'])
self.settings.boolean(['dry-run'],
"do a dry-run and don't actually do anything "
"beyond updating the git tree",
default=False)
self.settings.string(['lorry'],
'path to the lorry binary to use',
metavar='LORRY',
default=defaults['lorry'])
self.settings.string(['config-name'],
'configuration leafname. Defaults to '
'lorry-controller.conf',
metavar='CONFNAME',
default=defaults['config-name'])
self.settings.boolean(['lorry-verbose'],
'Whether to pass --verbose to lorry',
default=False)
self.settings.string(['lorry-log'],
'Log file name for lorry if wanted',
metavar='LORRYLOG',
default=None)
self.settings.string(['html-file'],
'HTML filename for lorry controller status',
metavar='HTMLFILE',
default=None)
def process_args(self, args):
logging.info("Starting to control lorry")
try:
os.chdir(self.settings['work-area'])
except OSError, e:
logging.error("Unable to chdir() to %s" %
self.settings['work-area'])
raise SystemExit(2)
if not os.path.isdir("git"):
logging.error("Unable to find git checkout")
raise SystemExit(3)
if not os.path.isdir("work"):
os.mkdir("work")
logging.info("Updating configuration checkout")
self.rungit(['remote', 'update', 'origin'])
self.rungit(['reset', '--hard', 'origin/master'])
self.rungit(['clean', '-fdx'])
self.lorrycmd=[self.settings['lorry']]
if self.settings['lorry-verbose']:
self.lorrycmd += ["--verbose"]
if self.settings['lorry-log'] is not None:
self.lorrycmd += ["--log", self.settings['lorry-log']]
if not os.path.exists(os.path.join('git',
self.settings['config-name'])):
logging.error("Unable to find lorry-controller.conf in git")
raise SystemExit(4)
self.conf = LorryControllerConfig(self, 'git/lorry-controller.conf')
self.html = HTMLStatusManager(self)
if self.settings['dry-run']:
self.html.series = 0
self.html.write_out_status()
self.conf.parse_config()
with WorkingStateManager(self) as mgr:
# Update any troves
self.html.set_mgr(mgr)
self.html.bump_state()
self.conf.update_troves(mgr)
prev_lorries = set(mgr.lorry_state.keys())
cur_lorries = set(self.conf.lorries.keys())
logging.info("Starting processing. Previously %d lorries "
"were handled. We currently have %d defined." % (
len(prev_lorries), len(cur_lorries)))
# 1. Handle deletes for any old lorries we no longer want
self.html.bump_state()
logging.info("Delete any old lorries...")
for dead_lorry in prev_lorries - cur_lorries:
self.html.set_processing(dead_lorry)
logging.info("Dead lorry: %s" % dead_lorry)
conf_uuid = mgr.lorry_state[dead_lorry]['conf']
if conf_uuid in self.conf.configs:
should_delete = self.conf.configs[conf_uuid]['destroy']
else:
# Could not find UUID in config, switch to 'never'
should_delete = "never"
want_destroy = (should_delete == "always")
if should_delete == "unchanged":
exit, out, err = self.maybe_runcmd(
['git', 'ls-remote', 'ssh://git@localhost/%s.git' %
dead_lorry], dry=True)
if exit != 0:
logging.error("Unable to ls-remote to decide if "
"unchanged. Assuming it is changed.")
else:
logging.debug("TODO: Should decide if unchanged!")
if want_destroy:
exit, out, err = self.maybe_runcmd(['ssh', 'git@localhost',
'destroy', dead_lorry],
dry=True)
if exit != 0:
logging.error("Unable to destroy %s" % dead_lorry)
else:
token = token_finder.match(out).group(1)
exit, out, err = self.maybe_runcmd(
['ssh', 'git@localhost', 'destroy', dead_lorry,
token])
if exit != 0:
logging.error("Unable to destroy %s despite having"
" the token %s" %
(dead_lorry, token))
else:
logging.debug("Destroyed")
del mgr.lorry_state[dead_lorry]
# 2. Handle creates for any new lorries we now want
self.html.bump_state()
logging.info("Create any new lorries...")
for new_lorry in cur_lorries - prev_lorries:
self.html.set_processing(new_lorry)
logging.info("New lorry: %s" % new_lorry)
lorry = self.conf.lorries[new_lorry]
conf_uuid = lorry['controller-uuid']
conf = self.conf.configs[conf_uuid]
nextdue = self.conf.duetimes[new_lorry]
# Make new lorries overdue.
nextdue -= conf['interval-parsed']
should_create = conf['create'] == "always"
store_state = True
if should_create:
exit, out, err = self.maybe_runcmd(["ssh", "git@localhost",
"create", new_lorry])
if exit != 0:
if ' already exists' in err:
logging.warn("Repository %s already exists" %
new_lorry)
else:
logging.error("Unable to create repository %s" %
new_lorry)
logging.error(err)
store_state = False
if store_state:
self.maybe_runcmd(["ssh", "git@localhost", "set-head",
new_lorry, lorry['source-HEAD']])
mgr.lorry_state[new_lorry] = {
'destroy': conf['destroy'],
'conf': conf_uuid,
'lorry': lorry,
'next-due': nextdue,
}
else:
# Remove this from cur_lorries so we don't run it
cur_lorries.remove(new_lorry)
# 3. For every lorry we have, update the settings if necessary.
# and reset the next-due as appropriate.
self.html.bump_state()
logging.info("Update active lorry configurations...")
updated_count = 0
for upd_lorry in cur_lorries:
if mgr.lorry_state[upd_lorry]['lorry'] != \
self.conf.lorries[upd_lorry]:
lorry = self.conf.lorries[upd_lorry]
old_lorry = mgr.lorry_state[upd_lorry]["lorry"]
if lorry["source-HEAD"] != \
old_lorry.get("source-HEAD", "refs/heads/master"):
self.maybe_runcmd(['ssh', 'git@localhost', 'set-head',
upd_lorry, lorry["source-HEAD"]])
conf_uuid = lorry['controller-uuid']
conf = self.conf.configs[conf_uuid]
nextdue = self.conf.duetimes[upd_lorry]
mgr.lorry_state[upd_lorry] = {
'destroy': conf['destroy'],
'conf': conf_uuid,
'lorry': lorry,
'next-due': nextdue,
}
updated_count += 1
logging.info("Result: %d/%d lorries needed updating" % (
updated_count, len(cur_lorries)))
# 3. Iterate all active lorries and see if they're due
logging.info("Iterate active lorries looking for work...")
now = time.time()
lorried = 0
earliest_due = None
what_early_due = ""
lorries_to_run = []
for lorry in cur_lorries:
state = mgr.lorry_state[lorry]
conf_uuid = state['conf']
conf = self.conf.configs[conf_uuid]
due = state['next-due']
if now >= due:
lorries_to_run.append(lorry)
lorries_to_run.sort()
for lorry in lorries_to_run:
state = mgr.lorry_state[lorry]
conf_uuid = state['conf']
conf = self.conf.configs[conf_uuid]
due = state['next-due']
lorried += 1
logging.info("Running %d/%d. Lorrying: %s" % (
lorried, len(lorries_to_run),lorry))
self.html.set_processing(lorry)
with mgr.runner(lorry) as runner:
runner.run_lorry(*self.lorrycmd)
while state['next-due'] <= now:
state['next-due'] += conf['interval-parsed']
for lorry in cur_lorries:
state = mgr.lorry_state[lorry]
due = state['next-due']
if earliest_due is None or due < earliest_due:
earliest_due = due
what_early_due = lorry
if earliest_due is None:
logging.info("Lorried %d. No idea what's next." % lorried)
else:
logging.info("Lorried %d. %s due in %d seconds" % (
lorried, what_early_due, int(earliest_due - now)))
logging.info("All done.")
self.html.bump_state()
def rungit(self, args):
self.runcmd(['git']+args, cwd=os.path.join(self.settings['work-area'],
'git'))
def maybe_http_request(self, url, dry=False):
if (not self.settings['dry-run']) or dry:
request = urllib2.Request(url, None, {})
response = urllib2.urlopen(request)
code = response.getcode()
if code == 200:
return 0, response.read(), ''
else:
return code, response.read(), str(code)
else:
logging.debug('DRY-RUN: Not sending a request to %s' % url)
return 0, 'DRY-RUN', 'DRY-RUN'
def maybe_runcmd(self, cmdline, dry=False, *args, **kwargs):
if (not self.settings['dry-run']) or dry:
return self.runcmd_unchecked(cmdline, *args, **kwargs)
else:
logging.debug("DRY-RUN: Not running %r" % cmdline)
return 0, 'DRY-RUN', 'DRY-RUN'
if __name__ == '__main__':
LorryController(version='1').run()
|
