Class: Ignition::Manager

Inherits:
Foreman::Engine
  • Object
show all
Defined in:
lib/ignition/engine/manager.rb

Constant Summary collapse

BUNDLES_JSON = 
"#{Ignition::ROOT_FOLDER}/bundles.json"
BUNDLES_STATUS_JSON = 
"#{Ignition::ROOT_FOLDER}/bundles_status.json"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(broadcast_client) ⇒ Manager

Returns a new instance of Manager.



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# File 'lib/ignition/engine/manager.rb', line 12

def initialize(broadcast_client)
	#load the plugs
	super()

	@recent_logs = {}

	@registered_bundles = {}

	@process_ids = {}

	@shutdown = false

	@broadcast_client = broadcast_client

	@broadcast_client.add_message_listener(self)

	@network_daemons = {}

	env = ENV
	
	@bundles = load_bundles

	BundleHelper.prepare_bundles(@bundles)

	register_bundles

	register_signal_handlers

	start_network_ping
end

Instance Attribute Details

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/ignition/engine/manager.rb', line 7

def env
  @env
end

Instance Method Details

#add_process(bundle, index) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 289

def add_process(bundle,index)
	proc = process(bundle.id)
   	pid =spawn_process(bundle,proc,index)  
   	bundle.status.add_pid(pid)
   	# update_bundle_running_status(b)
end

#apply_scale(bundle, count) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 261

def apply_scale(bundle,count)
	pp bundle
	puts bundle.status.scale.class
	puts "currently running #{bundle.status.scale}. Wanted #{count}"
	if (bundle.status.scale > count)
		# downscale to count. kill processes
		bundle.status.scale.downto(count+1) do |n|
			puts "apply_scale down #{n}"
			if n >= 1
				remove_process(bundle,n)
				sleep(0.1)
			end
		end
	elsif (bundle.status.scale < count)
		# add processes
		# diff = count - bundle.status.scale
		puts "adding process."
		(bundle.status.scale+1).upto(count) do |n|
			puts "apply_scale up #{n}" 
			if n >= 1
				add_process(bundle,n)
				sleep(0.1)
			end
		end
	end
	# update_bundle_running_status(bundle)
end

#bundle(id) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 247

def bundle(id)
	@bundles.select{ |b| b.id == id }.first
end

#bundles ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 43

def bundles
	@bundles
end

#bundles_json ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 326

def bundles_json
	begin
		FileUtils.mkdir_p File.dirname(BUNDLES_JSON)
		File.read(BUNDLES_JSON)
	rescue Exception => exc
		# puts exc.message
		# puts exc.backtrace
		"[]"
	end
end

#bundles_status_json ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 337

def bundles_status_json
	begin
		FileUtils.mkdir_p File.dirname(BUNDLES_STATUS_JSON)
		File.read(BUNDLES_STATUS_JSON)
	rescue Exception => exc
		# puts exc.message
		# puts exc.backtrace
		"[]"
	end
end

#flush ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 362

def flush
	remove_old_pids(@bundles)
	File.write(BUNDLES_JSON,JSON.pretty_generate( @bundles.map{|b| b.reject{|k| k == "status"}} ))
	File.write(BUNDLES_STATUS_JSON,JSON.pretty_generate( @bundles.map do |b| 
			{ "id" => b.id , "status" => b.status } 
	end
	))
end

#handle_hangup ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 197

def handle_hangup
    puts "custom SIGHUP received"
    terminate_gracefully
    @shutdown = true
    sleep(1)
    # exit(1)
    # Process.kill("EXIT", 0)
end

#handle_interrupt ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 188

def handle_interrupt
    puts "custom SIGINT received"
    terminate_gracefully
    @shutdown = true
    sleep(1)
    # exit(1)	    
    # Process.kill("EXIT", 0)
end

#handle_term_signal ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 179

def handle_term_signal
    puts "custom SIGTERM received"
    terminate_gracefully
    @shutdown = true
    sleep(1)
    # exit(1)
    # Process.kill("EXIT", 0)
end

#kill_process_and_wait(pid, signal = "SIGTERM") ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 234

def kill_process_and_wait(pid,signal="SIGTERM")
      begin
      	puts "killing process #{pid}"
        Process.kill signal, pid
      rescue Errno::ESRCH, Errno::EPERM
      end
      begin
      	Process.wait(pid)
      	puts "process finished #{pid}"
	  rescue Errno::ECHILD
	  end
end

#load_bundle(bh) ⇒ Object

end from foreman engine



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# File 'lib/ignition/engine/manager.rb', line 84

def load_bundle(bh)
	if (!bundle(bh.id).nil?)
		raise "Bundle Exists. Unload bundle before adding."
	end

	bundle = Ignition::Bundle.new(bh)
	BundleHelper.prepare_bundle(bundle)

	@bundles << bundle
	register_bundle(bundle)
	flush
end

#load_bundles ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 348

def load_bundles
	bundles = JSON.parse(bundles_json).map { |b| Ignition::Bundle.new(b) }
	# pp @bundles 

	JSON.parse(bundles_status_json).each do |bs| 
		# bundles
		b = bundles.select{ |b| b.id == bs.id }.first 
		unless b.nil?
			b.status = Ignition::BundleStatus.new(bs.status)
		end
	end
	remove_old_pids(bundles)
end

#logs(bundle_id) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 407

def logs(bundle_id)
	# @recent_logs[bundle_id]
	proc_ids = @recent_logs.keys.select { |a| a.scan(/#{bundle_id}.\d+/).size > 0 }

	proc_ids.map { |b| @recent_logs[b].to_a }.flatten
end

#name_for_bundle_index(bundle, index) ⇒ Object

OVERRIDES END



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# File 'lib/ignition/engine/manager.rb', line 208

def name_for_bundle_index(bundle,index)
	[ bundle.id, index.to_s ].compact.join(".")
end

#network_daemons ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 384

def network_daemons
	@network_daemons
end

#new_message(message) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 378

def new_message(message)
	# pp message

	@network_daemons[message.handle] = Time.now
end

#output(name, data) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 69

def output(name, data)
  	log = "#{Time.now.strftime("%H:%M:%S.%L")} - #{data}"
  	puts "#{name} - #{log}"

  	if @recent_logs[name].nil?
  		@recent_logs[name] = FixedArray.new(100)
  	end
  	@recent_logs[name].push(log)
end

#process_count ⇒ Object

end



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# File 'lib/ignition/engine/manager.rb', line 318

def process_count
	@process_ids.count
end

#process_ids ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 322

def process_ids
	@process_ids
end

#recent_logs ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 403

def recent_logs
	@recent_logs
end

#register(name, command, options = {}) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 170

def register(name, command, options={})
  	options[:env] ||= env
  	options[:cwd] ||= File.dirname(command.split(" ").first)
  	process = Foreman::Process.new(command, options)
  	@names[process] = name
  	@processes << process
  	process #just return the process!
end

#register_bundle(bundle) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 54

def register_bundle(bundle)
	puts "Register bundle #{bundle.id}"

	options = {}
	options[:cwd] = bundle.cwd 
	
	proc = register(bundle.id,bundle.command,options)

	@registered_bundles[proc] = bundle
end

#register_bundles ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 47

def register_bundles
	@bundles.each do |b|
		register_bundle(b)
	end
	pp @registered_bundles
end

#remove_old_pids(bundles) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 371

def remove_old_pids(bundles)
	bundles.each do |b|
		b.status.clean_pids
	end
end

#remove_process(bundle, index) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 296

def remove_process(bundle,index)
	name = name_for_bundle_index(bundle, index)
	pid = @process_ids[name]
	unless pid.nil?
		kill_process_and_wait(pid)
		# bundle.scale.pids.reject! { |p| p == pid }
		bundle.status.remove_pid(pid)
	end
end

#run(on_shutdown) ⇒ Object

end



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# File 'lib/ignition/engine/manager.rb', line 117

def run(on_shutdown)
	Thread.new {
		begin
			spawn_processes
		    watch_for_output
		    flush
		    sleep 0.1
		    
		    while(!@shutdown)
		    # loop {
	    	    pid = watch_for_termination { 
		    		puts "child died"
		    		# terminate_gracefully 
		    	}
		    	# puts "got pid notification #{pid}"
				if pid.nil?
					sleep(1)
					# puts "waiting for child process"
				end
			end
			puts "spawn thread complete."
			# loop { sleep(1000) }
			on_shutdown.call
		rescue Exception => exc
			puts exc.message
			puts exc.backtrace
			terminate_gracefully
			on_shutdown.call 
		end
	}

end

#scale(name, count) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 251

def scale(name,count)
	bundle_to_scale = bundle(name)
	
	apply_scale(bundle_to_scale,count)

	bundle_to_scale.status.scale = count

	flush
end

#shutdown ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 79

def shutdown
end

#spawn_process(bundle, process, n) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 212

def spawn_process(bundle,process,n)
  # 1.upto(count) do |n|
       reader, writer = create_pipe
       begin
          	puts "starting process"
          	name = name_for_bundle_index(bundle, n)
          	pid = process.run(:output => writer, :env => {
           	"PORT" => port_for(process, n).to_s,
           	"PS" => name
          	})
         	puts "started process"
         	@process_ids[name] = pid
        	writer.puts "started with pid #{pid}"
       rescue Errno::ENOENT
         writer.puts "unknown command: #{process.command}"
       end
       @running[pid] = [process, n]
       @readers[pid] = reader
     # end
     	pid
end

#spawn_processes ⇒ Object

OVERRIDES START - more like monkey patches



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# File 'lib/ignition/engine/manager.rb', line 157

def spawn_processes
  	puts "override spawn process"
    @processes.each do |process|
    	b = @registered_bundles[process]
    	1.upto(b.status.scale) do |n|
    		pid =  spawn_process(b,process,n)  
    		b.status.add_pid(pid)
    	end
    	# update_bundle_running_status(b)
	end
    pp @running
end

#start_network_ping ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 388

def start_network_ping
	Thread.new {
		begin
			loop {
				sleep(1)
				# puts "sending ping"
				@broadcast_client.transmit("PING")
			}
      rescue Exception => exc
        puts exc.message
        puts exc.backtrace
      end
	}
end

#startup ⇒ Object

start from foreman engine



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# File 'lib/ignition/engine/manager.rb', line 66

def startup
end

#stop ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 150

def stop
	puts "calling stop...."
	# terminate_gracefully
	# @shutdown = true
end

#unload_bundle(bh) ⇒ Object 



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# File 'lib/ignition/engine/manager.rb', line 97

def unload_bundle(bh)
	if (bundle(bh.id).nil?)
		raise "Bundle #{bh.id} does NOT exist. Cannot unload."
	end

	#check for running bundles. if there are then raise error. need to be stopped first.

	# bundle = Ignition::Bundle.new(bh)
	# @bundles << bundle

	@bundles.reject! {|b| b.id == bh.id }

	# register_bundle(bundle)
	flush
end