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# Copyright (c) 2009 Reza Lotun http://reza.lotun.name/
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import weakref
from boto.ec2.autoscale.request import Request
class Trigger(object):
"""
An auto scaling trigger.
"""
def __init__(self, connection=None, name=None, autoscale_group=None,
dimensions=None, measure_name=None,
statistic=None, unit=None, period=60,
lower_threshold=None,
lower_breach_scale_increment=None,
upper_threshold=None,
upper_breach_scale_increment=None,
breach_duration=None):
"""
Initialize an auto-scaling trigger object.
:type name: str
:param name: The name for this trigger
:type autoscale_group: str
:param autoscale_group: The name of the AutoScalingGroup that will be
associated with the trigger. The AutoScalingGroup
that will be affected by the trigger when it is
activated.
:type dimensions: list
:param dimensions: List of tuples, i.e.
('ImageId', 'i-13lasde') etc.
:type measure_name: str
:param measure_name: The measure name associated with the metric used by
the trigger to determine when to activate, for
example, CPU, network I/O, or disk I/O.
:type statistic: str
:param statistic: The particular statistic used by the trigger when
fetching metric statistics to examine.
:type period: int
:param period: The period associated with the metric statistics in
seconds. Valid Values: 60 or a multiple of 60.
:type unit:
:param unit
:type lower_threshold:
:param lower_threshold
"""
self.name = name
self.connection = connection
self.dimensions = dimensions
self.breach_duration = breach_duration
self.upper_breach_scale_increment = upper_breach_scale_increment
self.created_time = None
self.upper_threshold = upper_threshold
self.status = None
self.lower_threshold = lower_threshold
self.period = period
self.lower_breach_scale_increment = lower_breach_scale_increment
self.statistic = statistic
self.unit = unit
self.namespace = None
if autoscale_group:
self.autoscale_group = weakref.proxy(autoscale_group)
else:
self.autoscale_group = None
self.measure_name = measure_name
def __repr__(self):
return 'Trigger:%s' % (self.name)
def startElement(self, name, attrs, connection):
return None
def endElement(self, name, value, connection):
if name == 'BreachDuration':
self.breach_duration = value
elif name == 'TriggerName':
self.name = value
elif name == 'Period':
self.period = value
elif name == 'CreatedTime':
self.created_time = value
elif name == 'Statistic':
self.statistic = value
elif name == 'Unit':
self.unit = value
elif name == 'Namespace':
self.namespace = value
elif name == 'AutoScalingGroupName':
self.autoscale_group_name = value
elif name == 'MeasureName':
self.measure_name = value
else:
setattr(self, name, value)
def update(self):
""" Write out differences to trigger. """
self.connection.create_trigger(self)
def delete(self):
""" Delete this trigger. """
params = {
'TriggerName' : self.name,
'AutoScalingGroupName' : self.autoscale_group_name,
}
req =self.connection.get_object('DeleteTrigger', params,
Request)
self.connection.last_request = req
return req
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