Class: Jets::RubyServer

Inherits:
Object
  • Object
show all
Defined in:
lib/jets/ruby_server.rb

Constant Summary collapse

PORT = 
8080

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.run ⇒ Object 



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# File 'lib/jets/ruby_server.rb', line 141

def self.run
  new.run
end

Instance Method Details

#prewarm_request(event) ⇒ Object 



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# File 'lib/jets/ruby_server.rb', line 121

def prewarm_request(event)
  # JSON.dump("prewarmed_at" => Time.now.to_s)
  Jets.increase_prewarm_count
  Jets.logger.info("Prewarm request")
  %Q|{"prewarmed_at":"#{Time.now.to_s}"}| # raw json for speed
end

#run ⇒ Object 



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# File 'lib/jets/ruby_server.rb', line 18

def run
  Jets.boot(stringio: true) # outside of child process for COW
  Jets.eager_load!

  # INT - ^C
  trap('INT') do
    puts "Shutting down ruby_server.rb..."
    FileUtils.rm_f("/tmp/jets-rackup.pid") # remove the rack subprocess pid in case it exists
    sleep 0.1
    exit
  end

  if ENV['FOREGROUND'] # Usage above
    # start_rack_server # commented out because we expect user to start the rack server in the foreground
    serve # ruby_server
    return
  end

  # Reaching here means we'll run the server in the "background"
  pid = Process.fork

  if pid.nil? # we're in child process
    start_rack_server
    serve # ruby_server
  else # we're in parent process
    # Detach main jets ruby server
    Process.detach(pid) # dettached but still in the "foreground" since server loop runs in the foreground
  end
end

#serve ⇒ Object

runs in the child process



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# File 'lib/jets/ruby_server.rb', line 90

def serve
  server = TCPServer.new(PORT) # Server bind to port 8080
  puts "Ruby server started on port #{PORT}" if ENV['FOREGROUND'] || ENV['JETS_DEBUG'] || ENV['C9_USER']

  loop do
    client = server.accept    # Wait for a client to connect

    input_completed, event, handler = nil, nil, nil
    unless input_completed
      event = client.gets&.strip # text or nil
      handler = client.gets&.strip # text or nil
      # The event is nil when a client connects and immediately disconnects without sending data
      if event.nil?
        # puts "event was nil" # uncomment to debug
        next
      end

      input_completed = true
    end

    result = event['_prewarm'] ?
      prewarm_request(event) :
      standard_request(event, '{}', handler)

    Jets::IO.flush # flush output and write to disk for node shim

    client.puts(result)
    client.close
  end
end

#standard_request(event, context, handler) ⇒ Object 



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# File 'lib/jets/ruby_server.rb', line 128

def standard_request(event, context, handler)
  Jets::Processors::MainProcessor.new(
    event,
    context,
    handler).run
rescue Exception => e
  JSON.dump(
    "stackTrace" => e.backtrace,
    "errorMessage" => e.message,
    "errorType" => "RubyError",
  )
end

#start_rack_server ⇒ Object

Megamode support



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# File 'lib/jets/ruby_server.rb', line 49

def start_rack_server
  return unless Jets.rack?

  # Fire and forget for concurrent, will wait with wait_for_rack_socket
  Thread.new do
    Jets::Rack::Server.start
  end

  wait_for_rack_socket # blocks until rack server is up
end

#wait_for_rack_socket ⇒ Object

blocks until rack server is up



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# File 'lib/jets/ruby_server.rb', line 61

def wait_for_rack_socket
  return unless Jets.rack?

  retries = 0
  max_retries = 30 # 15 seconds at a delay of 0.5s
  delay = 0.5
  if ENV['C9_USER'] # overrides for local testing
    max_retries = 3
    delay = 3
  end
  begin
    server = TCPSocket.new('localhost', 9292)
    server.close
  rescue Errno::ECONNREFUSED
    puts "Unable to connect to localhost:9292. Delay for #{delay} and will try to connect again."  if ENV['JETS_DEBUG']
    sleep(delay)
    retries += 1
    if retries < max_retries
      retry
    else
      puts "Giving up on trying to connect to localhost:9292"
      return false
    end
  end
  puts "Connected to localhost:9292 successfully"
  true
end