Class: RText::Service

Inherits:
Object
  • Object
show all
Includes:
MessageHelper
Defined in:
lib/rtext/service.rb

Constant Summary collapse

PortRangeStart = 
9001
PortRangeEnd = 
9100
FlushInterval = 
1
ProtocolVersion = 
1

Instance Method Summary collapse

Methods included from MessageHelper

#each_json_object_string, #escape_all_strings, #extract_message, #serialize_message, #unescape_all_strings

Methods included from JsonInterface

#json_to_object, #object_to_json, set_j2o_converter, set_o2j_converter

Constructor Details

#initialize(service_provider, options = {}) ⇒ Service

Creates an RText backend service. Options:

:timeout
  idle time in seconds after which the service will terminate itself

:logger
  a logger object on which the service will write its logging output

:on_startup:
  a Proc which is called right after the service has started up
  can be used to output version information



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# File 'lib/rtext/service.rb', line 33

def initialize(service_provider, options={})
  @service_provider = service_provider
  @timeout = options[:timeout] || 60
  @logger = options[:logger]
  @on_startup = options[:on_startup]
  @lock_file_path = options[:lock_file_path] || File.expand_path('.rtext.lock')
  @config_file_path = options[:config_file_path] || File.expand_path('.rtext.config')
  @lock_file = nil
end

Instance Method Details

#message_received(sock, obj) ⇒ Object 



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# File 'lib/rtext/service.rb', line 113

def message_received(sock, obj)
  if check_request(obj) 
    request_start = Time.now
    @logger.debug("request: "+obj.inspect) if @logger
    response = { "type" => "response", "invocation_id" => obj["invocation_id"] }
    case obj["command"]
    when "version"
      version(sock, obj, response)  
    when "load_model"
      load_model(sock, obj, response)
    when "content_complete"
      content_complete(sock, obj, response)
    when "link_targets" 
      link_targets(sock, obj, response)
    when "find_elements"
      find_elements(sock, obj, response)
    when "stop"
      @logger.info("RText service, stopping now (stop requested)") if @logger
      @stop_requested = true
    else
      @logger.warn("unknown command #{obj["command"]}") if @logger
      response["type"] = "unknown_command_error"
      response["command"] = obj["command"] 
    end
    @logger.debug("response: "+truncate_response_for_debug_output(response).inspect) \
      if response && @logger
    send_response(sock, response)
    @logger.info("request complete (#{Time.now-request_start}s)")
  end
end

#run ⇒ Object 



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# File 'lib/rtext/service.rb', line 43

def run
  Filelock @lock_file_path, :timeout => 0, :wait => 1 do
    server = create_server 
    puts "RText service, listening on port #{server.addr[1]}"
    @logger.debug('Server started') if @logger
    File.write(@config_file_path, YAML.dump({'port' => server.addr[1], 'pid' => Process.pid}))
    begin
      @on_startup.call if @on_startup
      $stdout.flush
    
      last_access_time = Time.now
      last_flush_time = Time.now
      @stop_requested = false
      sockets = []
      request_data = {}
      while !@stop_requested
        begin
          sock = server.accept_nonblock
          sock.sync = true
          sockets << sock
          @logger.info "accepted connection" if @logger
        rescue Errno::EAGAIN, Errno::ECONNABORTED, Errno::EPROTO, Errno::EINTR, Errno::EWOULDBLOCK
        rescue Exception => e
          @logger.warn "unexpected exception during socket accept: #{e.class}"
        end
        sockets.dup.each do |sock|
          data = nil
          begin
            data = sock.read_nonblock(100000)
            @logger.debug('Got data') if @logger
          rescue Errno::EWOULDBLOCK
          rescue IOError, EOFError, Errno::ECONNRESET, Errno::ECONNABORTED
            sock.close
            request_data[sock] = nil
            sockets.delete(sock)
          rescue Exception => e
            # catch Exception to make sure we don't crash due to unexpected exceptions
            @logger.warn "unexpected exception during socket read: #{e.class}"
            sock.close
            request_data[sock] = nil
            sockets.delete(sock)
          end
          if data
            last_access_time = Time.now
            request_data[sock] ||= ""
            request_data[sock].concat(data)
            @logger.debug("Data available: #{request_data[sock]}") if @logger
            while obj = extract_message(request_data[sock])
              @logger.debug("Got message #{obj.inspect}") if @logger
              message_received(sock, obj)
            end
          end
        end
        IO.select([server] + sockets, [], [], 1)
        if Time.now > last_access_time + @timeout
          @logger.info("RText service, stopping now (timeout)") if @logger
          break 
        end
        if Time.now > last_flush_time + FlushInterval
          $stdout.flush
          last_flush_time = Time.now
        end
      end
    ensure
      @logger.warn("Config file doesn't exist, but lock is acquired, it could be a bug") unless File.exist?(@config_file_path)
      File.unlink(@config_file_path) if File.exist?(@config_file_path)
    end
  end
end