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# encoding: UTF-8
require 'mauve/alert'
require 'log4r'
module Mauve
#
# This corresponds to a alert_group clause in the configuration. It is what
# is used to classify alerts into levels, and thus who gets notified about it
# and when.
#
class AlertGroup < Struct.new(:name, :includes, :acknowledgement_time, :level, :notifications)
#
# Define some constants, and the ordering.
#
URGENT = :urgent
NORMAL = :normal
LOW = :low
LEVELS = [LOW, NORMAL, URGENT]
class << self
# Finds all AlertGroups that match an alert.
#
# @param [Mauve::Alert] alert
#
# @return [Array] AlertGroups that match
def matches(alert)
grps = find_all { |alert_group| alert_group.includes?(alert) }
#
# Make sure we always match the last (and therefore default) group.
#
grps << all.last unless grps.include?(all.last)
grps
end
#
#
#
def find_all(&block)
return all unless block_given?
all.find_all do |alert_group|
yield(alert_group)
end
end
#
#
#
def find(&block)
return nil unless block_given?
all.find do |alert_group|
yield(alert_group)
end
end
# @return [Log4r::Logger]
def logger
Log4r::Logger.new self.to_s
end
# All AlertGroups
#
# @return [Array]
def all
return [] if Configuration.current.nil?
Configuration.current.alert_groups
end
# Find all alerts that match
#
# @deprecated Buggy method, use Alert.get_all().
#
# This method returns all the alerts in all the alert_groups. Only
# the first one should be returned thus making this useless. If you want
# a list of all the alerts matching a level, use Alert.get_all().
#
# @return [Array]
def all_alerts_by_level(level)
Configuration.current.alert_groups.map do |alert_group|
alert_group.level == level ? alert_group.current_alerts : []
end.flatten.uniq
end
end
# Creates a new AlertGroup
#
# @param name Name of alert group
#
# @return [AlertGroup] self
def initialize(name)
self.name = name
self.level = :normal
self.includes = Proc.new { true }
self
end
# @return [String]
def to_s
"#<AlertGroup:#{name} (level #{level})>"
end
# The list of current raised alerts in this group.
#
# @return [Array] Array of Mauve::Alert
def current_alerts
Alert.all(:cleared_at => nil, :raised_at.not => nil).select { |a| includes?(a) }
end
# Decides whether a given alert belongs in this group according to its
# includes { } clause
#
# @param [Mauve::Alert] alert
#
# @return [Boolean] Success or failure.
def includes?(alert)
unless alert.is_a?(Alert)
logger.error "Got given a #{alert.class} instead of an Alert!"
logger.debug caller.join("\n")
return false
end
alert.instance_eval(&self.includes) ? true : false
end
alias matches_alert? includes?
# @return [Log4r::Logger]
def logger ; self.class.logger ; end
# Signals that a given alert (which is assumed to belong in this group) has
# undergone a significant change. We resend this to every notify list.
# The time is used to determine the time to be used when evaluating
# "during" blocks in the notifier clauses.
#
# @param [Mauve::Alert] alert
# @param [Time] at
#
# @return [Boolean] indicates success or failure of alert.
def notify(alert, at=Time.now)
#
# If there are no notifications defined.
#
if notifications.nil?
logger.warn("No notifications found for #{self.inspect}")
return false
end
#
# This is where we set the reminder -- i.e. on a per-alert-group basis.
#
remind_at = notifications.inject(nil) do |reminder_time, notification|
this_time = notification.remind_at_next(alert, at)
if reminder_time.nil? or (!this_time.nil? and reminder_time > this_time)
this_time
else
reminder_time
end
end
#
# OK got the next reminder time.
#
unless remind_at.nil?
this_reminder = AlertChanged.new(
:level => level.to_s,
:alert_id => alert.id,
:person => self.name,
:at => at,
:update_type => alert.update_type,
:remind_at => remind_at,
:was_relevant => true)
this_reminder.save
end
#
# The notifications are specified in the config file.
#
sent_to = []
notifications.each do |notification|
sent_to << notification.notify(alert, sent_to, at)
end
return (sent_to.length > 0)
end
# This sorts by priority (urgent first), and then alphabetically, so the
# first match is the most urgent.
#
# @param [Mauve::AlertGroup] other
#
# @return [Integer]
def <=>(other)
[LEVELS.index(self.level), self.name] <=> [LEVELS.index(other.level), other.name]
end
end
end
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