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from .base import MarathonObject
class MarathonConstraint(MarathonObject):
"""Marathon placement constraint.
See https://mesosphere.github.io/marathon/docs/constraints.html
:param str field: constraint operator target
:param str operator: must be one of [UNIQUE, CLUSTER, GROUP_BY, LIKE, UNLIKE]
:param value: [optional] if `operator` is CLUSTER, constrain tasks to servers where `field` == `value`.
If `operator` is GROUP_BY, place at most `value` tasks per group. If `operator`
is `LIKE` or `UNLIKE`, filter servers using regexp.
:type value: str, int, or None
"""
"""Valid operators"""
def __init__(self, field, operator, value=None):
self.field = field
self.operator = operator
self.value = value
def __repr__(self):
if self.value:
template = "MarathonConstraint::{field}:{operator}:{value}"
else:
template = "MarathonConstraint::{field}:{operator}"
return template.format(**self.__dict__)
def json_repr(self, minimal=False):
"""Construct a JSON-friendly representation of the object.
:param bool minimal: [ignored]
:rtype: list
"""
if self.value:
return [self.field, self.operator, self.value]
else:
return [self.field, self.operator]
@classmethod
def from_json(cls, obj):
"""Construct a MarathonConstraint from a parsed response.
:param dict attributes: object attributes from parsed response
:rtype: :class:`MarathonConstraint`
"""
if len(obj) == 2:
(field, operator) = obj
return cls(field, operator)
if len(obj) > 2:
(field, operator, value) = obj
return cls(field, operator, value)
@classmethod
def from_string(cls, constraint):
"""
:param str constraint: The string representation of a constraint
:rtype: :class:`MarathonConstraint`
"""
obj = constraint.split(':')
marathon_constraint = cls.from_json(obj)
if marathon_constraint:
return marathon_constraint
raise ValueError("Invalid string format. "
"Expected `field:operator:value`")
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