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|
#
# Standard modules
#
require 'beanstalk-client'
require 'json'
require 'logger'
#
# Implementation of our protocol tests.
#
require 'custodian/alerter.rb'
require 'custodian/protocol-tests/dns.rb'
require 'custodian/protocol-tests/ftp.rb'
require 'custodian/protocol-tests/http.rb'
require 'custodian/protocol-tests/jabber.rb'
require 'custodian/protocol-tests/ldap.rb'
require 'custodian/protocol-tests/ping.rb'
require 'custodian/protocol-tests/rsync.rb'
require 'custodian/protocol-tests/smtp.rb'
require 'custodian/protocol-tests/ssh.rb'
require 'custodian/protocol-tests/tcp.rb'
#
# This class contains the code for connecting to a Beanstalk queue,
# fetching tests from it, and executing them
#
class CustodianWorker
#
# The beanstalk queue.
#
attr_reader :queue
#
# 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, logfile )
# Connect to the queue
@queue = Beanstalk::Pool.new([server])
# 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 if ( ENV['VERBOSE'] )
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
job = @queue.reserve()
log_message( "Job aquired - Job ID : #{job.id}" )
#
# Get the job body
#
json = job.body
raise ArgumentError, "Body doesn't look like JSON" unless( json =~ /[{}]/ )
#
# Decode the JSON body - it should return a non-empty hash.
#
hash = JSON.parse( json )
#
# Ensure we got a non-empty hash.
#
raise ArgumentError, "JSON didn't decode to a hash" unless hash.kind_of?(Hash)
raise ArgumentError, "JSON hash is empty" if (hash.empty?)
#
# Are we being verbose?
#
hash['verbose'] = 1 if ( ENV['VERBOSE'] )
#
# Output the details.
#
log_message( "Job body contains the following keys & values:")
hash.keys.each do |key|
log_message( " #{key} => #{hash[key]}" )
end
#
# Did the test succeed? If not count the number of times it failed in
# a row. We'll repeat several times
#
success = false
count = 0
#
# As a result of this test we'll either raise/clear with mauve.
#
# This helper will do that job.
#
alert = Alerter.new( hash )
#
# Convert the test-type to a class name, to do the protocol test.
#
# Given a test-type "foo" we'll attempt to instantiate a class called FOOTest.
#
test = hash['test_type']
test = "http" if ( test == "https" )
clazz = test.upcase
clazz = "#{clazz}Test"
#
# Create the test object.
#
obj = eval(clazz).new( hash )
#
# Ensure that the object we load implements the two methods
# we expect.
#
if ( ( ! obj.respond_to?( "error") ) ||
( ! obj.respond_to?( "run_test" ) ) )
puts "Class #{clazz} doesn't implement the full protocol-test API"
end
#
# We'll run no more than MAX times.
#
# We stop the execution on a single success.
#
while ( ( count < @retry_count ) && ( success == false ) )
log_message( "Running test - [#{count}/#{@retry_count}]" )
if ( obj.run_test() )
log_message( "Test succeeed - clearing alert" )
success = true
alert.clear()
result = true
end
count += 1
end
#
# If we didn't succeed on any of the attempts raise the alert.
#
if ( ! success )
#
# Raise the alert, passing the error message.
#
log_message( "Test failed - alerting with #{obj.error()}" )
alert.raise( obj.error() )
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 - stop then.
#
def process_until_fail
while( process_single_job() )
# nop
end
end
end
|
