Class: Async::HTTP::Protocol::HTTP11

Inherits:
IO::Protocol::Line
  • Object
show all
Defined in:
lib/async/http/protocol/http11.rb

Overview

Implements basic HTTP/1.1 request/response.

Direct Known Subclasses

HTTP10

Defined Under Namespace

Classes: Request, Response

Constant Summary collapse

CRLF = 
"\r\n".freeze
CONNECTION = 
'connection'.freeze
HOST = 
'host'.freeze
CLOSE = 
'close'.freeze
VERSION = 
"HTTP/1.1".freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stream) ⇒ HTTP11 



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# File 'lib/async/http/protocol/http11.rb', line 44

def initialize(stream)
  super(stream, CRLF)
  
  @persistent = true
  @count = 0
end

Instance Attribute Details

#count ⇒ Object (readonly)

Returns the value of attribute count.



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# File 'lib/async/http/protocol/http11.rb', line 55

def count
  @count
end

Instance Method Details

#call(request) ⇒ Object

Used by the client to send requests to the remote server.



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# File 'lib/async/http/protocol/http11.rb', line 162

def call(request)
  Async.logger.debug(self) {"#{request.method} #{request.path} #{request.headers.inspect}"}
  
  # We carefully interpret https://tools.ietf.org/html/rfc7230#section-6.3.1 to implement this correctly.
  begin
    write_request(request.authority, request.method, request.path, self.version, request.headers)
  rescue
    # If we fail to fully write the request and body, we can retry this request.
    raise RequestFailed.new
  end
  
  # Once we start writing the body, we can't recover if the request fails. That's because the body might be generated dynamically, streaming, etc.
  write_body(request.body)
  
  return Response.new(self, request)
rescue
  # This will ensure that #reusable? returns false.
  @stream.close
  
  raise
end

#good? ⇒ Boolean

Can we use this connection to make requests?



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# File 'lib/async/http/protocol/http11.rb', line 63

def good?
  @stream.connected?
end

#hijack ⇒ Async::Wrapper 



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# File 'lib/async/http/protocol/http11.rb', line 89

def hijack
  @persistent = false
  
  @stream.flush
  
  return @stream.io
end

#multiplex ⇒ Object

Only one simultaneous connection at a time.



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# File 'lib/async/http/protocol/http11.rb', line 58

def multiplex
  1
end

#next_request ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 113

def next_request
  # The default is true.
  return nil unless @persistent
  
  request = Request.new(self)
  
  unless persistent?(request.headers)
    @persistent = false
  end
  
  return request
rescue
  # Bad Request
  write_response(self.version, 400, {}, nil)
  
  raise
end

#peer ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 51

def peer
  @stream.io
end

#persistent?(headers) ⇒ Boolean 



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# File 'lib/async/http/protocol/http11.rb', line 80

def persistent?(headers)
  if connection = headers[CONNECTION]
    return !connection.include?(CLOSE)
  else
    return true
  end
end

#read_request ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 207

def read_request
  method, path, version = read_line.split(/\s+/, 3)
  headers = read_headers
  
  @persistent = persistent?(headers)
  
  body = read_request_body(headers)
  
  @count += 1
  
  return headers.delete(HOST), method, path, version, headers, body
end

#read_response(request) ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 192

def read_response(request)
  version, status, reason = read_line.split(/\s+/, 3)
  Async.logger.debug(self) {"#{version} #{status} #{reason}"}
  
  headers = read_headers
  
  @persistent = persistent?(headers)
  
  body = read_response_body(request, status, headers)
  
  @count += 1
  
  return version, Integer(status), reason, headers, body
end

#receive_requests(task: Task.current) ⇒ Object

Server loop.



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# File 'lib/async/http/protocol/http11.rb', line 132

def receive_requests(task: Task.current)
  while request = next_request
    response = yield(request, self)
    
    return if @stream.closed?
    
    if response
      write_response(self.version, response.status, response.headers, response.body)
    else
      # If the request failed to generate a response, it was an internal server error:
      write_response(self.version, 500, {}, nil)
    end
    
    # Gracefully finish reading the request body if it was not already done so.
    request.finish
    
    # This ensures we yield at least once every iteration of the loop and allow other fibers to execute.
    task.yield
  end
end

#reusable? ⇒ Boolean 



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# File 'lib/async/http/protocol/http11.rb', line 67

def reusable?
  @persistent && !@stream.closed?
end

#version ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 76

def version
  VERSION
end

#write_request(authority, method, path, version, headers) ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 184

def write_request(authority, method, path, version, headers)
  @stream.write("#{method} #{path} #{version}\r\n")
  @stream.write("host: #{authority}\r\n")
  write_headers(headers)
  
  @stream.flush
end

#write_response(version, status, headers, body) ⇒ Object 



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# File 'lib/async/http/protocol/http11.rb', line 220

def write_response(version, status, headers, body)
  @stream.write("#{version} #{status}\r\n")
  write_headers(headers)
  write_body(body)
  
  @stream.flush
end