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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
#
# Constructor - save the test-object away & instantiate
# the redis connection.
#
def initialize( obj )
begin
require 'rubygems'
require 'redis'
@redis = Redis.new(:host => @target )
rescue
puts "ERROR Loading redis rubygem!"
end
@test = obj
end
#
# Store an alert in redis
#
def raise
return unless( @redis )
# hostname + test-type
host = @test.target
test = @test.get_type
# store the error - set an expiry time of 5 minutes
@redis.set( "#{host}-#{test}", "ERR")
@redis.expireat( "#{host}-#{test}", Time.now.to_i + 5 * 60 )
# Set the reason
@redis.set( "#{host}-#{test}-reason", @test.error() )
@redis.expireat( "#{host}-#{test}-reason", Time.now.to_i + 5 * 60 )
# make sure this alert is discoverable
@redis.sadd( "hosts", "#{host}-#{test}" )
end
#
# Clear an alert in redis
#
def clear
return unless( @redis )
# hostname + test-type
host = @test.target
test = @test.get_type
# store the OK - set the expiry time of five minutes
@redis.set( "#{host}-#{test}", "OK")
@redis.expireat( "#{host}-#{test}", Time.now.to_i + 5 * 60 )
# clear the reason
@redis.set( "#{host}-#{test}-reason", "")
@redis.expireat( "#{host}-#{test}-reason", Time.now.to_i + 5 * 60 )
# make sure this alert is discoverable
@redis.sadd( "hosts", "#{host}-#{test}" )
end
#
# Store a test-duration in redis
#
def duration( ms )
return unless( @redis )
#
# hostname + test-type
#
host = @test.target
test = @test.get_type
#
# Store the host.
#
# make sure this alert is discoverable
@redis.sadd( "duration-hosts", host )
#
# Store the test.
#
@redis.sadd( "duration-host-#{host}", test )
#
# Now store the duration, and trim it to the most recent
# 1000 entries.
#
@redis.lpush( "#{host}-#{test}", ms )
@redis.ltrim( "#{host}-#{test}", "0", "1200" )
end
register_alert_type "redis"
end
end
end
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