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#
# The redis-alerter.
#
# This doesn't raise/clear alerts in the traditional sense, instead it just
# stores results in a redis database where you can poll them from a status-panel,
# or similar.
#
# There is a global set called "hosts" which has the hostname-test-type lists
# and the individual results can be pulled by simple key-fetches on those.
#
module Custodian
module Alerter
class RedisAlert < AlertFactory
#
# The test this alerter cares about
#
attr_reader :test
#
# The redis-object
#
attr_reader :redis
attr_reader :available
#
# Constructor - save the test-object away & instantiate
# the redis connection.
#
def initialize( obj )
@available = true
begin
require 'rubygems'
require 'redis'
rescue
puts "LOADING redis failed"
@available = false
end
@test = obj
@redis = Redis.new( ) if ( @available )
end
#
# Store an alert in redis
#
def raise
return if ( ! @available )
# hostname + test-type
host = @test.target
test = @test.get_type
# store the error
@redis.set( "#{host}-#{test}", "ERR")
@redis.set( "#{host}-#{test}-reason", @test.error() )
# make sure this alert is discoverable
@redis.sadd( "hosts", "#{host}-#{test}" )
end
#
# Clear an alert in redis
#
def clear
return if ( ! @available )
# hostname + test-type
host = @test.target
test = @test.get_type
# store the OK
@redis.set( "#{host}-#{test}", "OK")
@redis.set( "#{host}-#{test}-reason", "")
# make sure this alert is discoverable
@redis.sadd( "hosts", "#{host}-#{test}" )
end
register_alert_type "redis"
end
end
end
|
