Module: Consul::Template::Generator::CMD

Includes:
Consul::Template::Generator
Defined in:
lib/consul/template/generator/cmd.rb

Constant Summary

Constants included from Consul::Template::Generator

VERSION

Class Method Summary collapse

Class Method Details

.configure(consul_host, templates, session_key, log_level, graphite_host = nil, graphite_paths = nil, diff_changes = false, session_ttl = nil) ⇒ Object 



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# File 'lib/consul/template/generator/cmd.rb', line 10

def configure(consul_host, templates, session_key, log_level, graphite_host = nil, graphite_paths = nil, diff_changes = false, session_ttl = nil)
  Consul::Template::Generator.configure do |config|
    config.log_level = log_level
    config.templates = templates
    config.session_key = session_key
    config.session_ttl = session_ttl || 30
    config.consul_host = consul_host
    config.graphite_host = graphite_host
    config.graphite_paths = graphite_paths || {}
    config.diff_changes = diff_changes
  end
  @config = Consul::Template::Generator.config
end

.configure_signal_handlers ⇒ Object 



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# File 'lib/consul/template/generator/cmd.rb', line 24

def configure_signal_handlers
  Signal.trap("INT") do
    @config.logger.error "Received INT signal..."
    @terminated = true
    @interrupted = true
  end
  Signal.trap("TERM") do
    @config.logger.error "Received TERM signal..."
    @terminated = true
    @interrupted = true
  end
end

.run(cycle_sleep = nil, lock_sleep = nil) ⇒ Object 



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# File 'lib/consul/template/generator/cmd.rb', line 37

def run(cycle_sleep = nil, lock_sleep = nil)
  configure_signal_handlers
  @terminated = false
  cycle_sleep ||= 0.5
  lock_sleep ||= 1.0
  uploaded_hashes = {}
  runner = CTRunner.new nil, false
  begin
    runner.create_session
    @interrupted = false
    runner.acquire_session_lock do
      @config.logger.info "Session lock acquired..."
      begin
        @config.templates.each do |template,template_key|
          new_hash = runner.run(template, template_key, uploaded_hashes[template], @config.diff_changes)
          unless new_hash.nil?
            uploaded_hashes[template] =  new_hash
            if @config.graphite_paths.include? template
              runner.post_graphite_event @config.graphite_paths[template]
            end
          end
          sleep cycle_sleep
        end
      rescue ConsulSessionExpired
        @config.logger.error "The current consul session has expired."
        break
      rescue Exception => e
        @config.logger.error "An error occurred while updating template: #{e.message}"
        @config.logger.debug "Sleeping before attempting to update again..."
        sleep lock_sleep
        break
      end until @interrupted
    end
  rescue Exception => e
    @config.logger.info "Unable to obtain session lock: #{e.message}"
    @config.logger.debug "Sleeping before attempting lock session again..."
    sleep lock_sleep
  ensure
    runner.destroy_session
  end until @terminated
  0
end

.run_once ⇒ Object 



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# File 'lib/consul/template/generator/cmd.rb', line 80

def run_once
  begin
    @config.templates.each do |template,template_key|
      runner = CTRunner.new
      result = runner.run(template, template_key, nil, @config.diff_changes)
      unless result.nil?
        if @config.graphite_paths.include? template
          runner.post_graphite_event @config.graphite_paths[template]
        end
      end
    end
  rescue Exception => e
    @config.logger.error "An unexpected error occurred, unable to process template: #{e.message}"
    1
  else
    0
  end
end