Class: Synapse::Synapse

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/synapse.rb

Instance Method Summary collapse

Methods included from Logging

configure_logger_for, #log, logger_for

Constructor Details

#initialize(opts = {}) ⇒ Synapse

Returns a new instance of Synapse.



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# File 'lib/synapse.rb', line 15

def initialize(opts={})
  # create objects that need to be notified of service changes
  @config_generators = create_config_generators(opts)
  raise "no config generators supplied" if @config_generators.empty?

  # create the service watchers for all our services
  raise "specify a list of services to connect in the config" unless opts.has_key?('services')
  @service_watchers = create_service_watchers(opts['services'])

  # configuration is initially enabled to configure on first loop
  @config_updated = true

  # Any exceptions in the watcher threads should wake the main thread so
  # that we can fail fast.
  Thread.abort_on_exception = true

  log.debug "synapse: completed init"
end

Instance Method Details

#available_generators ⇒ Object 



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# File 'lib/synapse.rb', line 79

def available_generators
  Hash[@config_generators.collect{|cg| [cg.name, cg]}]
end

#reconfigure! ⇒ Object 



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# File 'lib/synapse.rb', line 75

def reconfigure!
  @config_updated = true
end

#run ⇒ Object

start all the watchers and enable haproxy configuration



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# File 'lib/synapse.rb', line 35

def run
  log.info "synapse: starting..."

  # start all the watchers
  @service_watchers.map { |watcher| watcher.start }

  # main loop
  loops = 0
  loop do
    @service_watchers.each do |w|
      raise "synapse: service watcher #{w.name} failed ping!" unless w.ping?
    end

    if @config_updated
      @config_updated = false
      @config_generators.each do |config_generator|
        log.info "synapse: configuring #{config_generator.name}"
        config_generator.update_config(@service_watchers)
      end
    end

    sleep 1
    @config_generators.each do |config_generator|
      config_generator.tick(@service_watchers)
    end

    loops += 1
    log.debug "synapse: still running at #{Time.now}" if (loops % 60) == 0
  end

rescue StandardError => e
  log.error "synapse: encountered unexpected exception #{e.inspect} in main thread"
  raise e
ensure
  log.warn "synapse: exiting; sending stop signal to all watchers"

  # stop all the watchers
  @service_watchers.map(&:stop)
end