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|
#
# Standard modules
#
require 'beanstalk-client'
require 'logger'
#
# Our modules.
#
require 'custodian/alerts'
require 'custodian/settings'
#
# This list of all our protocol tests.
#
require 'custodian/protocoltests'
#
# This class contains the code for connecting to a Beanstalk queue,
# fetching tests from it, and executing them
#
module Custodian
class Worker
#
# The beanstalk queue.
#
attr_reader :queue
#
# The name of the alerter to use.
#
attr_reader :alerter
#
# How many times we re-test before we detect a failure
#
attr_reader :retry_count
#
# The log-file object
#
attr_reader :logger
#
# Constructor: Connect to the queue
#
def initialize( server, alerter, logfile )
# Connect to the queue
@queue = Beanstalk::Pool.new([server])
# Get the alerter-type to instantiate
@alerter = alerter
# Instantiate the logger.
@logger = Logger.new( logfile, "daily" )
if ( ENV['REPEAT'] )
@retry_count=ENV['REPEAT'].to_i
else
@retry_count=5
end
end
#
# Write the given message to our logfile - and show it to the console
# if we're running with '--verbose' in play
#
def log_message( msg )
@logger.info( msg )
puts msg
end
#
# Process jobs from the queue - never return.
#
def run!
while( true )
log_message( "\n" )
log_message( "\n" )
log_message( "Waiting for job.." )
process_single_job()
end
end
#
# Fetch a single job from the queue, and process it.
#
def process_single_job
result = false
begin
#
# Acquire a job.
#
job = @queue.reserve()
log_message( "Job aquired - Job ID : #{job.id}" )
#
# Get the job body
#
body = job.body
raise ArgumentError, "Job was empty" if (body.nil?)
raise ArgumentError, "Job was not a string" unless body.kind_of?(String)
#
# Output the job.
#
log_message( "Job: #{body}" )
#
# The count of times this test has run.
#
count = 1
#
# Create the test-object.
#
test = Custodian::TestFactory.create( body )
#
# As a result of this test we'll either raise/clear with one
# of our alerter classes.
#
# Here we create one of the correct type.
#
alert = Custodian::AlertFactory.create( @alerter, test )
#
# Set the target for the alert, which might be nil.
#
alert.set_target( Custodian::Settings.instance().alerter_target() )
#
# We'll run no more than MAX times.
#
# We stop the execution on a single success.
#
while ( ( count < @retry_count ) && ( result == false ) )
log_message( "Running test - [#{count}/#{@retry_count}]" )
#
# Run the test - inverting the result if we should
#
result = test.run_test
result = ! result if ( test.inverted() )
if ( result )
log_message( "Test succeeed - clearing alert" )
success = true
alert.clear()
end
count += 1
end
#
# If we didn't succeed on any of the attempts raise the alert.
#
if ( ! result )
#
# Raise the alert, passing the error message.
#
log_message( "Test failed - alerting with #{test.error()}" )
alert.raise()
end
rescue => ex
puts "Exception raised processing job: #{ex}"
ensure
#
# Delete the job - either we received an error, in which case
# we should remove it to avoid picking it up again, or we handled
# it successfully so it should be removed.
#
log_message( "Job ID : #{job.id} - Removed" )
job.delete if ( job )
end
return result
end
#
# Process jobs until we see a failure, then stop.
#
def process_until_fail
while( process_single_job() )
# nop
end
end
end
end
|
