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# Copyright (C) 2012 Codethink Limited
#
import json
import logging
import re
import glob
import os
import time
import fnmatch
default_values = [
( u'create', u'never' ),
( u'destroy', u'never' ),
( u'interval', u'1m' ),
( u'stagger', False ),
( u'tarball', u'never' ),
( u'type', u'invalid_type' ),
]
valid_interval = re.compile(r"^([1-9][0-9]*)([mhd])?$")
interval_mults = {
None: 1,
'm': 60,
'h': 60 * 60,
'd': 60 * 60 * 24,
}
class LorryControllerConfig(object):
'''This encapsulates the configuration for lorry-controller.'''
def __init__(self, app, confpath):
self.app = app
self.confpath = confpath
self.lorries = {}
self.configs = {}
self.duetimes = {}
self.troves = []
def parse_config(self):
confpath = os.path.join(self.app.settings['work-area'], self.confpath)
logging.info("Parsing configuration: %s" % confpath)
try:
with open(confpath, "r") as fh:
self._raw_conf = json.load(fh)
except Exception, e:
logging.error("Unable to parse: %r" % e)
raise
logging.debug("Validating configuration semantics")
self._validate__raw_conf()
logging.info("Configuration loaded")
def _validate__raw_conf(self):
'''Validate the entire raw config.'''
if type(self._raw_conf) != list:
self._give_up("Configuration was not a list.")
for entry in self._raw_conf:
if type(entry) != dict:
self._give_up("Configuration entry was not a dict.")
if type(entry.get('type', None)) != unicode:
self._give_up("Configuration entry lacked a suitable 'type' "
"field.")
# Set the defaults
for key, defval in default_values:
entry[key] = entry.get(key, defval)
# And validate the generic values
self._validate__generics(entry)
# Now validate the rest
validator = getattr(self, '_validate_' + entry['type'], None)
if validator is None:
self._give_up("Configuration entry had unknown type: %s" %
entry['type'])
validator(entry)
def _validate__generics(self, entry):
'''Validate the generic entries such as 'uuid'.'''
if type(entry.get('uuid', None)) != unicode:
self._give_up("UUID missing, cannot reconcile without it!")
if entry['uuid'] in self.configs:
self._give_up("UUID is not unique")
self.configs[entry['uuid']] = entry
for key, defval in default_values:
if type(defval) != type(entry[key]):
self._give_up("Invalid type for '%s': %r" % (key, entry[key]))
self._validate__when(entry, 'create', ["always", "never"])
self._validate__when(entry, 'destroy',
["always", "never", "unchanged"])
self._validate__when(entry, 'tarball', ["always", "never", "first"])
entry['interval-parsed'] = self._parse_interval(entry['interval'])
if 'ls-interval' in entry:
entry['ls-interval-parsed'] = \
self._parse_interval(entry['ls-interval'])
def _validate__when(self, entry, key, valid_whens):
if entry[key] not in valid_whens:
self._give_up("Invalid value for %s: %s" % (key, entry[key]))
def _parse_interval(self, interval):
m = valid_interval.match(interval.lower())
if m is None:
self._give_up("Unable to parse '%s' as an interval" % interval)
num, mult = m.groups()
num = int(num)
mult = interval_mults.get(mult, None)
if mult is None:
self._give_up("Somehow, '%s' managed to appear as a multiplier!" %
m.group(2))
logging.debug("Converted interval %r to %r", interval, (num * mult))
return num * mult
def _validate_lorries(self, entry):
'''Validate a 'lorries' stanza.'''
if type(entry.get('globs', None)) != list:
self._give_up("Lorries stanzas need lists for their 'globs'")
if entry.get('prefix', None) is None:
entry['prefix'] = u""
if type(entry['prefix']) != unicode:
self._give_up("Lorry prefixes should be strings.")
my_lorries = set()
git_base = os.path.join(self.app.settings['work-area'], 'git')
for glob_entry in entry['globs']:
if type(glob_entry) != unicode:
self._give_up("Lorries globs should be strings")
fullglob = os.path.join(git_base, glob_entry)
my_lorries = my_lorries.union(set(glob.iglob(fullglob)))
for lorry in my_lorries:
if not lorry.startswith(git_base):
self._give_up("Glob found %s which is outside the git base")
logging.debug("Expanded globs in entry to %d lorry files" %
len(my_lorries))
logging.debug("Loading lorries into memory, please wait...")
my_lorry_names = set()
for lorry in my_lorries:
try:
with open(lorry, "r") as fh:
lorry_json = json.load(fh)
for name, content in lorry_json.iteritems():
fullname = os.path.join(entry['prefix'], name)
if self.lorries.get(fullname, None) is not None:
self._give_up("Lorry repeated: %s" % fullname)
content['controller-uuid'] = entry['uuid']
my_lorry_names.add(fullname)
self.lorries[fullname] = content
except Exception, e:
logging.warning("Unable to parse %s, because of %s. "
"Moving on" % (lorry, e))
# Now calculate the 'next due' time for every lorry we just parsed
starttime = time.time() - 1
endtime = starttime + entry['interval-parsed']
step = 0
if entry['stagger']:
step = (endtime - starttime) / len(my_lorry_names)
for lorry_name in my_lorry_names:
self.duetimes[lorry_name] = starttime
starttime += step
logging.debug("Now loaded %d lorries" % len(self.lorries.keys()))
def _validate_trove(self, entry):
# Validate top levels
if type(entry.get('trovehost', None)) != unicode:
self._give_up("Trove host %r is not a string" %
entry.get('trovehost', None))
if 'ls-interval-parsed' not in entry:
self._give_up("No ls-interval specified for %s" %
entry['trovehost'])
if type(entry.get('prefixmap', None)) != dict:
self._give_up("Prefixmap not a dict for %s" %
entry['trovehost'])
if type(entry.get('ignore', [])) != list:
self._give_up("Ignore is not a list for %s" %
entry['trovehost'])
# Validate prefixmap
for local, remote in entry['prefixmap'].iteritems():
if type(local) != unicode:
self._give_up("Local part of prefixmap is not a string: %r" %
local)
if type(remote) != unicode:
self._give_up("Remote part of prefixmap is not a string: %r" %
remote)
# Validate ignore
for ign in entry.get('ignore', []):
if type(ign) != unicode:
self._give_up("Part of ignore list is not a string: %r" % ign)
self.troves.append(entry)
def update_trove(self, trove, state):
logging.info("Processing trove %s (%s)" % (trove['trovehost'],
trove['uuid']))
# 1. Ensure that if we need to 'ls' the trove, we do it
now = time.time()
listcmdargs = ["ssh", "-oStrictHostKeyChecking=no",
"-oBatchMode=yes", "git@" + trove['trovehost'], "ls",
"--verbose"]
state['next-vls'] = state.get('next-vls', now - 1)
if state['next-vls'] < now:
exit, out, err = self.app.maybe_runcmd(listcmdargs, dry=True)
if exit == 0:
repo_info = {}
for entry in [x for x in out.split("\n") if x != ""]:
elems = entry.split(" ")
this_repo = {
"perm": elems[0],
"name": elems[1],
"head": elems[2],
"desc": " ".join(elems[3:]),
}
repo_info[elems[1]] = this_repo
state['last-ls-output'] = repo_info
logging.info("ls interval %d" % trove['ls-interval-parsed'])
logging.info("next-vls was %s" % time.asctime(time.gmtime(state['next-vls'])))
while state['next-vls'] < now:
state['next-vls'] += trove['ls-interval-parsed']
logging.info("next-vls now %s" % time.asctime(time.gmtime(state['next-vls'])))
else:
# Pass through unchanged
state['last-ls-output'] = state.get('last-ls-output', {})
def ignored(reponame):
for pattern in trove['ignore']:
if fnmatch.fnmatch(reponame, pattern):
return True
return False
# 2. For every entry in last-ls-output, construct a lorry if we want it
lorries_made = set()
for remotereponame, info in state['last-ls-output'].iteritems():
localreponame = None
for local, remote in trove['prefixmap'].iteritems():
if remotereponame.startswith(remote+"/"):
localreponame = "%s/%s" % (local,
remotereponame[len(remote)+1:])
if ((not ignored(remotereponame)) and (localreponame is not None)):
# Construct a lorry for this one.
lorry = {
"type": "git",
"url": "ssh://git@%s/%s.git" % (trove['trovehost'],
remotereponame),
"controller-uuid": trove['uuid'],
"source-HEAD": info["head"],
"refspecs": [ "+refs/heads/*:refs/heads/*",
"+refs/tags/*:refs/tags/*" ]
}
if localreponame in self.lorries:
logging.warn("Skipping %s (%s from %s) because we already "
"have something for that." % (
localreponame, remotereponame, trove['trovehost']))
else:
self.lorries[localreponame] = lorry
lorries_made.add(localreponame)
# 3. Now schedule all those lorries in case they're new
starttime = time.time() - 1
endtime = starttime + trove['interval-parsed']
step = 0
if trove['stagger']:
step = (endtime - starttime) / len(lorries_made)
for lorry_name in lorries_made:
self.duetimes[lorry_name] = starttime
starttime += step
logging.debug("Generated %d lorries from that trove" %
len(lorries_made))
def update_troves(self, statemgr):
# Now that we have a state manager we can look at the trove data.
for trove in self.troves:
self.app.html.set_processing(trove['uuid'])
trove_state = statemgr.get_trove(trove['uuid'])
self.update_trove(trove, trove_state)
def _give_up(self, *args, **kwargs):
logging.error(*args, **kwargs)
raise SystemExit(5)
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