Class: Fluent::HttpInput::Handler

Inherits:
Coolio::Socket
  • Object
show all
Defined in:
lib/fluent/plugin/in_http.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io, km, callback, body_size_limit, format, log, cors_allow_origins) ⇒ Handler

Returns a new instance of Handler.



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# File 'lib/fluent/plugin/in_http.rb', line 244

def initialize(io, km, callback, body_size_limit, format, log, cors_allow_origins)
  super(io)
  @km = km
  @callback = callback
  @body_size_limit = body_size_limit
  @next_close = false
  @format = format
  @log = log
  @cors_allow_origins = cors_allow_origins
  @idle = 0
  @km.add(self)

  @remote_port, @remote_addr = *Socket.unpack_sockaddr_in(io.getpeername) rescue nil
end

Instance Attribute Details

#content_type ⇒ Object (readonly)

Returns the value of attribute content_type.



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# File 'lib/fluent/plugin/in_http.rb', line 242

def content_type
  @content_type
end

Instance Method Details

#closing? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/in_http.rb', line 394

def closing?
  @next_close
end

#on_body(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 329

def on_body(chunk)
  if @body.bytesize + chunk.bytesize > @body_size_limit
    unless closing?
      send_response_and_close("413 Request Entity Too Large", {}, "Too large")
    end
    return
  end
  @body << chunk
end

#on_close ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 263

def on_close
  @km.delete(self)
end

#on_connect ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 267

def on_connect
  @parser = Http::Parser.new(self)
end

#on_headers_complete(headers) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 284

def on_headers_complete(headers)
  expect = nil
  size = nil

  if @parser.http_version == [1, 1]
    @keep_alive = true
  else
    @keep_alive = false
  end
  @env = {}
  @content_type = ""
  headers.each_pair {|k,v|
    @env["HTTP_#{k.gsub('-','_').upcase}"] = v
    case k
    when /Expect/i
      expect = v
    when /Content-Length/i
      size = v.to_i
    when /Content-Type/i
      @content_type = v
    when /Connection/i
      if v =~ /close/i
        @keep_alive = false
      elsif v =~ /Keep-alive/i
        @keep_alive = true
      end
    when /Origin/i
      @origin  = v
    when /X-Forwarded-For/i
      @remote_addr = v.split(",").first
    end
  }
  if expect
    if expect == '100-continue'
      if !size || size < @body_size_limit
        send_response_nobody("100 Continue", {})
      else
        send_response_and_close("413 Request Entity Too Large", {}, "Too large")
      end
    else
      send_response_and_close("417 Expectation Failed", {}, "")
    end
  end
end

#on_message_begin ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 280

def on_message_begin
  @body = ''
end

#on_message_complete ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 339

def on_message_complete
  return if closing?

  # CORS check
  # ==========
  # For every incoming request, we check if we have some CORS
  # restrictions and white listed origins through @cors_allow_origins.
  unless @cors_allow_origins.nil?
    unless @cors_allow_origins.include?(@origin)
      send_response_and_close("403 Forbidden", {'Connection' => 'close'}, "")
      return
    end
  end

  @env['REMOTE_ADDR'] = @remote_addr if @remote_addr

  uri = URI.parse(@parser.request_url)
  params = WEBrick::HTTPUtils.parse_query(uri.query)

  if @format != 'default'
    params[EVENT_RECORD_PARAMETER] = @body
  elsif @content_type =~ /^application\/x-www-form-urlencoded/
    params.update WEBrick::HTTPUtils.parse_query(@body)
  elsif @content_type =~ /^multipart\/form-data; boundary=(.+)/
    boundary = WEBrick::HTTPUtils.dequote($1)
    params.update WEBrick::HTTPUtils.parse_form_data(@body, boundary)
  elsif @content_type =~ /^application\/json/
    params['json'] = @body
  end
  path_info = uri.path

  params.merge!(@env)
  @env.clear

  code, header, body = *@callback.call(path_info, params)
  body = body.to_s

  header['Access-Control-Allow-Origin'] = @origin if !@cors_allow_origins.nil? && @cors_allow_origins.include?(@origin)
  if @keep_alive
    header['Connection'] = 'Keep-Alive'
    send_response(code, header, body)
  else
    send_response_and_close(code, header, body)
  end
end

#on_read(data) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 271

def on_read(data)
  @idle = 0
  @parser << data
rescue
  @log.warn "unexpected error", error: $!.to_s
  @log.warn_backtrace
  close
end

#on_write_complete ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 385

def on_write_complete
  close if @next_close
end

#send_response(code, header, body) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 398

def send_response(code, header, body)
  header['Content-Length'] ||= body.bytesize
  header['Content-Type'] ||= 'text/plain'

  data = %[HTTP/1.1 #{code}\r\n]
  header.each_pair {|k,v|
    data << "#{k}: #{v}\r\n"
  }
  data << "\r\n"
  write data

  write body
end

#send_response_and_close(code, header, body) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 389

def send_response_and_close(code, header, body)
  send_response(code, header, body)
  @next_close = true
end

#send_response_nobody(code, header) ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 412

def send_response_nobody(code, header)
  data = %[HTTP/1.1 #{code}\r\n]
  header.each_pair {|k,v|
    data << "#{k}: #{v}\r\n"
  }
  data << "\r\n"
  write data
end

#step_idle ⇒ Object 



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# File 'lib/fluent/plugin/in_http.rb', line 259

def step_idle
  @idle += 1
end