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|
# encoding: UTF-8
require 'yaml'
require 'socket'
# require 'mauve/datamapper'
require 'mauve/proto'
require 'mauve/alert'
require 'mauve/history'
require 'mauve/mauve_thread'
require 'mauve/mauve_time'
require 'mauve/timer'
require 'mauve/udp_server'
require 'mauve/pop3_server'
require 'mauve/processor'
require 'mauve/http_server'
require 'mauve/heartbeat'
require 'log4r'
module Mauve
class Server < MauveThread
#
# This is the order in which the threads should be started.
#
THREAD_CLASSES = [UDPServer, HTTPServer, Pop3Server, Processor, Timer, Notifier, Heartbeat]
attr_reader :hostname, :database, :initial_sleep
attr_reader :packet_buffer, :notification_buffer, :started_at
include Singleton
def initialize
super
@hostname = "localhost"
@database = "sqlite3:///./mauvealert.db"
@started_at = MauveTime.now
@initial_sleep = 300
#
# Keep these queues here to prevent a crash in a subthread losing all the
# subsquent things in the queue.
#
@packet_buffer = []
@notification_buffer = []
end
def hostname=(h)
raise ArgumentError, "hostname must be a string" unless h.is_a?(String)
@hostname = h
end
def database=(d)
raise ArgumentError, "database must be a string" unless d.is_a?(String)
@database = d
end
def initial_sleep=(s)
raise ArgumentError, "initial_sleep must be numeric" unless s.is_a?(Numeric)
@initial_sleep = s
end
def logger
@logger ||= Log4r::Logger.new(self.class.to_s)
end
def setup
DataMapper.setup(:default, @database)
# DataObjects::Sqlite3.logger = Log4r::Logger.new("Mauve::DataMapper")
#
# Update any tables.
#
Alert.auto_upgrade!
AlertChanged.auto_upgrade!
History.auto_upgrade!
Mauve::AlertEarliestDate.create_view!
end
def start
self.state = :starting
self.setup
self.run_thread { self.main_loop }
end
alias run start
def main_loop
thread_list = Thread.list
thread_list.delete(Thread.current)
THREAD_CLASSES.each do |klass|
#
# No need to double check ourselves.
#
thread_list.delete(klass.instance.thread)
#
# Do nothing if we're frozen or supposed to be stopping or still alive!
#
next if self.should_stop? or klass.instance.alive?
#
# ugh something is beginnging to smell.
#
begin
klass.instance.join
rescue StandardError => ex
logger.error "Caught #{ex.to_s} whilst checking #{klass} thread"
logger.debug ex.backtrace.join("\n")
end
#
# (re-)start the klass.
#
klass.instance.start unless self.should_stop?
end
#
# Now do the same with other threads. However if these ones crash, the
# server has to stop, as there is no method to restart them.
#
thread_list.each do |t|
next if self.should_stop? or t.alive?
begin
t.join
rescue StandardError => ex
logger.fatal "Caught #{ex.to_s} whilst checking threads"
logger.debug ex.backtrace.join("\n")
self.stop
break
end
end
end
def stop
if self.state == :stopping
# uh-oh already told to stop.
logger.error "Stop already called. Killing self!"
Kernel.exit 1
end
self.state = :stopping
THREAD_CLASSES.each do |klass|
klass.instance.stop unless klass.instance.nil?
end
thread_list = Thread.list
thread_list.delete(Thread.current)
thread_list.each do |t|
t.exit
end
self.state = :stopped
end
class << self
#
# BUFFERS
#
# These methods are here, so that if the threads that are popping and
# processing them crash, the buffer itself is not lost with the thread.
#
#
# These methods pop things on and off the packet_buffer
#
def packet_enq(a)
instance.packet_buffer.push(a)
end
def packet_deq
instance.packet_buffer.shift
end
def packet_buffer_size
instance.packet_buffer.size
end
alias packet_push packet_enq
alias packet_pop packet_deq
#
# These methods pop things on and off the notification_buffer
#
def notification_enq(a)
instance.notification_buffer.push(a)
end
def notification_deq
instance.notification_buffer.shift
end
def notification_buffer_size
instance.notification_buffer.size
end
alias notification_push notification_enq
alias notification_pop notification_deq
end
end
end
|
