def __init__(self,
adjustments=DEFAULT_ADJUSTMENTS,
children=None,
expected=DEFAULT_EXPECTED,
logname=None,
name="supervisor",
strategy=DEFAULT_STRATEGY,
window=DEFAULT_WINDOW,
**kwargs):
"""
Constructor.
:param name: the supervisor name
:param expected: the expected status (running|stopped)
:param window: the window of adjustments cycles to consider
:param adjustments: the maximum number of adjustments allowed
:param strategy: the strategy to be applied
:param children: the list of children attached to the supervisor
:param kwargs: extra parameters
"""
if children is None:
children = dict()
if logname is None:
logname = self.__class__.__name__
self.logname = logname
self.logger = logging.getLogger(logname)
self.name = name
self._expected = expected.lower()
self._window = get_int_or_die(
window,
"supervisor %s should have a valid integer window value: %s" %
(name, window))
self._adjustments = get_int_or_die(
adjustments,
"supervisor %s should have a valid integer adjustments value: %s" %
(name, adjustments))
if strategy not in ALLOWED_STRATEGIES:
raise ValueError(
"supervisor %s does not support given strategy: %s" %
(name, strategy, ))
self._strategy_name = strategy
self._strategy = Supervisor._strategy_by_name(
ALLOWED_STRATEGIES[strategy])(self)
for key in kwargs.keys():
if not key.startswith("var_"):
raise SimplevisorError(
"an invalid property has been specified for"
"supervisor %s: %s" %
(name, key))
self._children = list()
self._children_by_id = dict()
self._children_by_name = dict()
self.add_child_set(children.get("entry", list()))
if len(self._children) == 0:
raise SimplevisorError(
"empty supervisor found: %s" % (self.name, ))
self._cycles = list()
self._is_new = True
def sleep_interval(self):
""" Return the interval between every supervision cycle. """
value = self._config.get("interval", DEFAULT_INTERVAL)
result = get_int_or_die(
value,
"interval value must be an integer: %s" % (value, ))
return result
def __init__(self, name, expected=DEFAULT_EXPECTED,
timeout=DEFAULT_TIMEOUT,
control=None, daemon=None, path=None, pattern=None,
restart=None, start=None, status=None, stop=None,
**kwargs):
""" Service constructor. """
self.name = name
self._opts = {
"name": name,
"expected": expected,
"control": control,
"daemon": daemon,
"path": path,
"pattern": pattern,
"restart": restart,
"start": start,
"status": status,
"stop": stop,
"timeout": get_int_or_die(
timeout,
"timeout value for %s is not a valid integer: %s" %
(name, timeout)), }
self._status = {
"name": name,
"log": list(), }
for key in kwargs:
if not key.startswith("var_"):
raise ValueError(
"invalid property for service %s: %s" % (name, key))
self._is_new = True
try:
self._validate_opts()
except ValueError:
error = sys.exc_info()[1]
raise ValueError(
"service %s is not properly configured: %s" %
(self.name, error))
if control is None and daemon is not None:
si_loop = which("simplevisor-loop")
if si_loop is None:
raise RuntimeError(
"cannot find simplevisor-loop command in the "
"environment: %s" % (os.environ["PATH"], ))
common_path = "%s --pidfile %s" % (si_loop, daemon, )
self._opts["start"] = (
"%s -c 1 --daemon %s" % (common_path, start))
self._opts["stop"] = ("%s --quit" % (common_path, ))
self._opts["status"] = ("%s --status" % (common_path, ))
elif control is None and status is None:
if sys.platform != "linux2":
raise ValueError(
"don't know how to read process table, you must specify "
"a status command for service: %s" % (name, ))
if pattern is not None:
pat = pattern
else:
pat = " ".join(self.get_cmd("start"))
try:
self._opts["pattern_re"] = re.compile(pat)
LOGGER.debug(
"using %s as pattern for service %s" % (pat, name))
except re.error:
error = sys.exc_info()[1]
raise ValueError(
"%s service pattern not valid: %s" % (name, error))
