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# encoding: UTF-8
require 'mauve/alert'
require 'log4r'
module Mauve
class AlertGroup < Struct.new(:name, :includes, :acknowledgement_time, :level, :notifications)
def to_s
"#<AlertGroup:#{name} (level #{level})>"
end
class << self
def matches(alert)
all.select { |alert_group| alert_group.matches_alert?(alert) }
end
# If there is any significant change to a set of alerts, the Alert
# class sends the list here so that appropriate action can be taken
# for each one. We scan the list of alert groups to find out which
# alerts match which groups, then send a notification to each group
# object in turn.
#
def notify(alerts)
alerts.each do |alert|
groups = matches(alert)
#
# Make sure we've got a matching group
#
logger.warn "no groups found for #{alert.id}" if groups.empty?
#
# Notify just the group that thinks this alert is the most urgent.
#
%w(urgent normal low).each do |lvl|
this_group = groups.find{|grp| grp.level.to_s == lvl}
next if this_group.nil?
logger.info("notifying group #{this_group} of AlertID.#{alert.id} (matching #{lvl})")
this_group.notify(alert)
break
end
end
end
def logger
Log4r::Logger.new self.to_s
end
def all
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().
#
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
def initialize(name)
self.name = name
self.level = :normal
self.includes = Proc.new { true }
end
# The list of current raised alerts in this group.
#
def current_alerts
Alert.all(:cleared_at => nil, :raised_at.not => nil).select { |a| matches_alert?(a) }
end
# Decides whether a given alert belongs in this group according to its
# includes { } clause
#
# @param [Alert] alert An alert to test for belongness to group.
# @return [Boolean] Success or failure.
def matches_alert?(alert)
result = alert.instance_eval(&self.includes)
if true == result or
true == result.instance_of?(MatchData)
return true
end
return false
end
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.
#
def notify(alert)
notifications.each do |notification|
notification.alert_changed(alert)
end
end
end
end
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