Class: Puma::Server

Inherits:
Object
  • Object
show all
Extended by:
Delegation
Includes:
Const
Defined in:
lib/puma/server.rb

Overview

The HTTP Server itself. Serves out a single Rack app.

Constant Summary

Constants included from Const

Const::CGI_VER, Const::CHUNK_SIZE, Const::CLOSE, Const::CLOSE_CHUNKED, Const::CODE_NAME, Const::COLON, Const::CONNECTION_CLOSE, Const::CONNECTION_KEEP_ALIVE, Const::CONTENT_LENGTH, Const::CONTENT_LENGTH2, Const::CONTENT_LENGTH_S, Const::CONTENT_TYPE, Const::DATE, Const::ERROR_400_RESPONSE, Const::ERROR_404_RESPONSE, Const::ERROR_500_RESPONSE, Const::ERROR_503_RESPONSE, Const::ETAG, Const::ETAG_FORMAT, Const::FAST_TRACK_KA_TIMEOUT, Const::FIRST_DATA_TIMEOUT, Const::GATEWAY_INTERFACE, Const::GET, Const::HALT_COMMAND, Const::HEAD, Const::HIJACK, Const::HIJACK_IO, Const::HIJACK_P, Const::HOST, Const::HTTP, Const::HTTPS, Const::HTTPS_KEY, Const::HTTP_10, Const::HTTP_10_200, Const::HTTP_11, Const::HTTP_11_200, Const::HTTP_CONNECTION, Const::HTTP_HOST, Const::HTTP_IF_MODIFIED_SINCE, Const::HTTP_IF_NONE_MATCH, Const::HTTP_VERSION, Const::HTTP_X_FORWARDED_FOR, Const::KEEP_ALIVE, Const::LAST_MODIFIED, Const::LINE_END, Const::LOCALHOST, Const::MAX_BODY, Const::MAX_HEADER, Const::NEWLINE, Const::PATH_INFO, Const::PERSISTENT_TIMEOUT, Const::PORT_443, Const::PORT_80, Const::PUMA_CONFIG, Const::PUMA_SOCKET, Const::PUMA_TMP_BASE, Const::PUMA_VERSION, Const::RACK_AFTER_REPLY, Const::RACK_INPUT, Const::RACK_URL_SCHEME, Const::REDIRECT, Const::REMOTE_ADDR, Const::REQUEST_METHOD, Const::REQUEST_PATH, Const::REQUEST_URI, Const::RESTART_COMMAND, Const::SCRIPT_NAME, Const::SERVER_NAME, Const::SERVER_PORT, Const::SERVER_PROTOCOL, Const::SERVER_SOFTWARE, Const::SLASH, Const::STATUS_FORMAT, Const::STOP_COMMAND, Const::TRANSFER_ENCODING, Const::TRANSFER_ENCODING_CHUNKED

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Delegation

forward

Constructor Details

#initialize(app, events = Events.stdio) ⇒ Server

Create a server for the rack app app.

events is an object which will be called when certain error events occur to be handled. See Puma::Events for the list of current methods to implement.

Server#run returns a thread that you can join on to wait for the server to do it’s work.



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# File 'lib/puma/server.rb', line 49

def initialize(app, events=Events.stdio)
  @app = app
  @events = events

  @check, @notify = Puma::Util.pipe

  @status = :stop

  @min_threads = 0
  @max_threads = 16
  @auto_trim_time = 1

  @thread = nil
  @thread_pool = nil

  @persistent_timeout = PERSISTENT_TIMEOUT

  @binder = Binder.new(events)
  @own_binder = true

  @first_data_timeout = FIRST_DATA_TIMEOUT

  @leak_stack_on_error = true

  ENV['RACK_ENV'] ||= "development"
end

Instance Attribute Details

#app ⇒ Object

Returns the value of attribute app.



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# File 'lib/puma/server.rb', line 34

def app
  @app
end

#auto_trim_time ⇒ Object

Returns the value of attribute auto_trim_time.



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# File 'lib/puma/server.rb', line 39

def auto_trim_time
  @auto_trim_time
end

#binder ⇒ Object

Returns the value of attribute binder.



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# File 'lib/puma/server.rb', line 76

def binder
  @binder
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/puma/server.rb', line 33

def events
  @events
end

#leak_stack_on_error ⇒ Object

Returns the value of attribute leak_stack_on_error.



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# File 'lib/puma/server.rb', line 76

def leak_stack_on_error
  @leak_stack_on_error
end

#max_threads ⇒ Object

Returns the value of attribute max_threads.



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# File 'lib/puma/server.rb', line 37

def max_threads
  @max_threads
end

#min_threads ⇒ Object

Returns the value of attribute min_threads.



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# File 'lib/puma/server.rb', line 36

def min_threads
  @min_threads
end

#persistent_timeout ⇒ Object

Returns the value of attribute persistent_timeout.



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# File 'lib/puma/server.rb', line 38

def persistent_timeout
  @persistent_timeout
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/puma/server.rb', line 32

def thread
  @thread
end

Instance Method Details

#backlog ⇒ Object 



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# File 'lib/puma/server.rb', line 112

def backlog
  @thread_pool and @thread_pool.backlog
end

#begin_restart ⇒ Object 



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# File 'lib/puma/server.rb', line 623

def begin_restart
  begin
    @notify << RESTART_COMMAND
  rescue IOError
    # The server, in another thread, is shutting down
  end
end

#cork_socket(socket) ⇒ Object

6 == Socket::IPPROTO_TCP 3 == TCP_CORK 1/0 == turn on/off



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# File 'lib/puma/server.rb', line 94

def cork_socket(socket)
  socket.setsockopt(6, 3, 1) if socket.kind_of? TCPSocket
end

#default_server_port(env) ⇒ Object 



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# File 'lib/puma/server.rb', line 333

def default_server_port(env)
  env['HTTP_X_FORWARDED_PROTO'] == 'https' ? PORT_443 : PORT_80
end

#graceful_shutdown ⇒ Object

Wait for all outstanding requests to finish.



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# File 'lib/puma/server.rb', line 596

def graceful_shutdown
  @thread_pool.shutdown if @thread_pool
end

#halt(sync = false) ⇒ Object 



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# File 'lib/puma/server.rb', line 613

def halt(sync=false)
  begin
    @notify << HALT_COMMAND
  rescue IOError
    # The server, in another thread, is shutting down
  end

  @thread.join if @thread && sync
end

#handle_check ⇒ Object

:nodoc:



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# File 'lib/puma/server.rb', line 219

def handle_check
  cmd = @check.read(1) 

  case cmd
  when STOP_COMMAND
    @status = :stop
    return true
  when HALT_COMMAND
    @status = :halt
    return true
  when RESTART_COMMAND
    @status = :restart
    return true
  end

  return false
end

#handle_request(req, lines) ⇒ Object

Given the request env from client and a partial request body in body, finish reading the body if there is one and invoke the rack app. Then construct the response and write it back to client

cl is the previously fetched Content-Length header if there was one. This is an optimization to keep from having to look it up again.



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# File 'lib/puma/server.rb', line 346

def handle_request(req, lines)
  env = req.env
  client = req.io

  normalize_env env, client

  env[PUMA_SOCKET] = client

  env[HIJACK_P] = true
  env[HIJACK] = req

  body = req.body

  head = env[REQUEST_METHOD] == HEAD

  env[RACK_INPUT] = body
  env[RACK_URL_SCHEME] =  env[HTTPS_KEY] ? HTTPS : HTTP

  # A rack extension. If the app writes #call'ables to this
  # array, we will invoke them when the request is done.
  #
  after_reply = env[RACK_AFTER_REPLY] = []

  begin
    begin
      status, headers, res_body = @app.call(env)

      return :async if req.hijacked

      status = status.to_i

      if status == -1
        unless headers.empty? and res_body == []
          raise "async response must have empty headers and body"
        end

        return :async
      end
    rescue StandardError => e
      @events.unknown_error self, e, "Rack app"

      status, headers, res_body = lowlevel_error(e)
    end

    content_length = nil
    no_body = head

    if res_body.kind_of? Array and res_body.size == 1
      content_length = res_body[0].bytesize
    end

    cork_socket client

    line_ending = LINE_END
    colon = COLON

    if env[HTTP_VERSION] == HTTP_11
      allow_chunked = true
      keep_alive = env[HTTP_CONNECTION] != CLOSE
      include_keepalive_header = false

      # An optimization. The most common response is 200, so we can
      # reply with the proper 200 status without having to compute
      # the response header.
      #
      if status == 200
        lines << HTTP_11_200
      else
        lines.append "HTTP/1.1 ", status.to_s, " ",
                     fetch_status_code(status), line_ending

        no_body ||= status < 200 || STATUS_WITH_NO_ENTITY_BODY[status]
      end
    else
      allow_chunked = false
      keep_alive = env[HTTP_CONNECTION] == KEEP_ALIVE
      include_keepalive_header = keep_alive

      # Same optimization as above for HTTP/1.1
      #
      if status == 200
        lines << HTTP_10_200
      else
        lines.append "HTTP/1.0 ", status.to_s, " ",
                     fetch_status_code(status), line_ending

        no_body ||= status < 200 || STATUS_WITH_NO_ENTITY_BODY[status]
      end
    end

    response_hijack = nil

    headers.each do |k, vs|
      case k
      when CONTENT_LENGTH2
        content_length = vs
        next
      when TRANSFER_ENCODING
        allow_chunked = false
        content_length = nil
      when HIJACK
        response_hijack = vs
        next
      end

      vs.split(NEWLINE).each do |v|
        lines.append k, colon, v, line_ending
      end
    end

    if no_body
      if content_length and status != 204
        lines.append CONTENT_LENGTH_S, content_length.to_s, line_ending
      end

      lines << line_ending
      fast_write client, lines.to_s
      return keep_alive
    end

    if include_keepalive_header
      lines << CONNECTION_KEEP_ALIVE
    elsif !keep_alive
      lines << CONNECTION_CLOSE
    end

    unless response_hijack
      if content_length
        lines.append CONTENT_LENGTH_S, content_length.to_s, line_ending
        chunked = false
      elsif allow_chunked
        lines << TRANSFER_ENCODING_CHUNKED
        chunked = true
      end
    end

    lines << line_ending

    fast_write client, lines.to_s

    if response_hijack
      response_hijack.call client
      return :async
    end

    begin
      res_body.each do |part|
        if chunked
          client.syswrite part.bytesize.to_s(16)
          client.syswrite line_ending
          fast_write client, part
          client.syswrite line_ending
        else
          fast_write client, part
        end

        client.flush
      end

      if chunked
        client.syswrite CLOSE_CHUNKED
        client.flush
      end
    rescue SystemCallError, IOError
      raise ConnectionError, "Connection error detected during write"
    end

  ensure
    uncork_socket client

    body.close
    res_body.close if res_body.respond_to? :close

    after_reply.each { |o| o.call }
  end

  return keep_alive
end

#handle_servers ⇒ Object 



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# File 'lib/puma/server.rb', line 171

def handle_servers
  begin
    check = @check
    sockets = [check] + @binder.ios
    pool = @thread_pool

    while @status == :run
      begin
        ios = IO.select sockets
        ios.first.each do |sock|
          if sock == check
            break if handle_check
          else
            begin
              if io = sock.accept_nonblock
                c = Client.new io, @binder.env(sock)
                pool << c
              end
            rescue SystemCallError
            end
          end
        end
      rescue Errno::ECONNABORTED
        # client closed the socket even before accept
        client.close rescue nil
      rescue Object => e
        @events.unknown_error self, e, "Listen loop"
      end
    end

    graceful_shutdown if @status == :stop || @status == :restart
    @reactor.clear! if @status == :restart

    @reactor.shutdown
  rescue Exception => e
    STDERR.puts "Exception handling servers: #{e.message} (#{e.class})"
    STDERR.puts e.backtrace
  ensure
    @check.close
    @notify.close

    if @status != :restart and @own_binder
      @binder.close
    end
  end
end

#inherit_binder(bind) ⇒ Object 



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# File 'lib/puma/server.rb', line 82

def inherit_binder(bind)
  @binder = bind
  @own_binder = false
end

#lowlevel_error(e) ⇒ Object

A fallback rack response if @app raises as exception.



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# File 'lib/puma/server.rb', line 586

def lowlevel_error(e)
  if @leak_stack_on_error
    [500, {}, ["Puma caught this error: #{e.message} (#{e.class})\n#{e.backtrace.join("\n")}"]]
  else
    [500, {}, ["A really lowlevel plumbing error occured. Please contact your local Maytag(tm) repair man.\n"]]
  end
end

#normalize_env(env, client) ⇒ Object

Given a Hash env for the request read from client, add and fixup keys to comply with Rack’s env guidelines.



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# File 'lib/puma/server.rb', line 298

def normalize_env(env, client)
  if host = env[HTTP_HOST]
    if colon = host.index(":")
      env[SERVER_NAME] = host[0, colon]
      env[SERVER_PORT] = host[colon+1, host.bytesize]
    else
      env[SERVER_NAME] = host
      env[SERVER_PORT] = default_server_port(env)
    end
  else
    env[SERVER_NAME] = LOCALHOST
    env[SERVER_PORT] = default_server_port(env)
  end

  unless env[REQUEST_PATH]
    # it might be a dumbass full host request header
    uri = URI.parse(env[REQUEST_URI])
    env[REQUEST_PATH] = uri.path

    raise "No REQUEST PATH" unless env[REQUEST_PATH]
  end

  env[PATH_INFO] = env[REQUEST_PATH]

  # From http://www.ietf.org/rfc/rfc3875 :
  # "Script authors should be aware that the REMOTE_ADDR and
  # REMOTE_HOST meta-variables (see sections 4.1.8 and 4.1.9)
  # may not identify the ultimate source of the request.
  # They identify the client for the immediate request to the
  # server; that client may be a proxy, gateway, or other
  # intermediary acting on behalf of the actual source client."
  #
  env[REMOTE_ADDR] = client.peeraddr.last
end

#process_client(client, buffer) ⇒ Object

Given a connection on client, handle the incoming requests.

This method support HTTP Keep-Alive so it may, depending on if the client indicates that it supports keep alive, wait for another request before returning.



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# File 'lib/puma/server.rb', line 243

def process_client(client, buffer)
  begin
    close_socket = true

    while true
      case handle_request(client, buffer)
      when false
        return
      when :async
        close_socket = false
        return
      when true
        buffer.reset

        unless client.reset(@status == :run)
          close_socket = false
          client.set_timeout @persistent_timeout
          @reactor.add client
          return
        end
      end
    end

  # The client disconnected while we were reading data
  rescue ConnectionError
    # Swallow them. The ensure tries to close +client+ down

  # The client doesn't know HTTP well
  rescue HttpParserError => e
    client.write_400

    @events.parse_error self, client.env, e

  # Server error
  rescue StandardError => e
    client.write_500

    @events.unknown_error self, e, "Read"

  ensure
    buffer.reset

    begin
      client.close if close_socket
    rescue IOError, SystemCallError
      # Already closed
    rescue StandardError => e
      @events.unknown_error self, e, "Client"
    end
  end
end

#read_body(env, client, body, cl) ⇒ Object

Given the requset env from client and the partial body body plus a potential Content-Length value cl, finish reading the body and return it.

If the body is larger than MAX_BODY, a Tempfile object is used for the body, otherwise a StringIO is used.



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# File 'lib/puma/server.rb', line 537

def read_body(env, client, body, cl)
  content_length = cl.to_i

  remain = content_length - body.bytesize

  return StringIO.new(body) if remain <= 0

  # Use a Tempfile if there is a lot of data left
  if remain > MAX_BODY
    stream = Tempfile.new(Const::PUMA_TMP_BASE)
    stream.binmode
  else
    # The body[0,0] trick is to get an empty string in the same
    # encoding as body.
    stream = StringIO.new body[0,0]
  end

  stream.write body

  # Read an odd sized chunk so we can read even sized ones
  # after this
  chunk = client.readpartial(remain % CHUNK_SIZE)

  # No chunk means a closed socket
  unless chunk
    stream.close
    return nil
  end

  remain -= stream.write(chunk)

  # Raed the rest of the chunks
  while remain > 0
    chunk = client.readpartial(CHUNK_SIZE)
    unless chunk
      stream.close
      return nil
    end

    remain -= stream.write(chunk)
  end

  stream.rewind

  return stream
end

#run(background = true) ⇒ Object

Runs the server.

If background is true (the default) then a thread is spun up in the background to handle requests. Otherwise requests are handled synchronously.



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# File 'lib/puma/server.rb', line 126

def run(background=true)
  BasicSocket.do_not_reverse_lookup = true

  @status = :run

  @thread_pool = ThreadPool.new(@min_threads,
                                @max_threads,
                                IOBuffer) do |client, buffer|
    process_now = false

    begin
      process_now = client.eagerly_finish
    rescue HttpParserError => e
      client.write_400
      client.close

      @events.parse_error self, client.env, e
    rescue ConnectionError
      client.close
    else
      if process_now
        process_client client, buffer
      else
        client.set_timeout @first_data_timeout
        @reactor.add client
      end
    end
  end

  @reactor = Reactor.new self, @thread_pool

  @reactor.run_in_thread

  if @auto_trim_time
    @thread_pool.auto_trim!(@auto_trim_time)
  end

  if background
    @thread = Thread.new { handle_servers }
    return @thread
  else
    handle_servers
  end
end

#running ⇒ Object 



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# File 'lib/puma/server.rb', line 116

def running
  @thread_pool and @thread_pool.spawned
end

#stop(sync = false) ⇒ Object

Stops the acceptor thread and then causes the worker threads to finish off the request queue before finally exiting.



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# File 'lib/puma/server.rb', line 603

def stop(sync=false)
  begin
    @notify << STOP_COMMAND
  rescue IOError
    # The server, in another thread, is shutting down
  end

  @thread.join if @thread && sync
end

#uncork_socket(socket) ⇒ Object 



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# File 'lib/puma/server.rb', line 98

def uncork_socket(socket)
  begin
    socket.setsockopt(6, 3, 0) if socket.kind_of? TCPSocket
  rescue IOError
  end
end