# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require 'async/io/protocol/line'
require_relative 'request_failed'
require_relative '../request'
require_relative '../response'
require_relative '../headers'
require_relative '../body/chunked'
require_relative '../body/fixed'
module Async
module HTTP
module Protocol
# Implements basic HTTP/1.1 request/response.
class HTTP11 < Async::IO::Protocol::Line
CRLF = "\r\n".freeze
CONNECTION = 'connection'.freeze
HOST = 'host'.freeze
CLOSE = 'close'.freeze
VERSION = "HTTP/1.1".freeze
def initialize(stream)
super(stream, CRLF)
@persistent = true
@count = 0
end
attr :count
# Only one simultaneous connection at a time.
def multiplex
1
end
# Can we use this connection to make requests?
def good?
@stream.connected?
end
def reusable?
@persistent && !@stream.closed?
end
class << self
alias server new
alias client new
end
def version
VERSION
end
def persistent?(headers)
if connection = headers[CONNECTION]
return !connection.include?(CLOSE)
else
return true
end
end
# Server loop.
def receive_requests(task: Task.current)
while @persistent
request = Request.new(*read_request)
unless persistent?(request.headers)
@persistent = false
end
response = yield request
response.version ||= request.version
write_response(response.version, response.status, response.headers, response.body)
request.finish
# This ensures we yield at least once every iteration of the loop and allow other fibers to execute.
task.yield
end
end
def call(request)
request.version ||= self.version
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, request.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(*read_response)
rescue
# This will ensure that #reusable? returns false.
@stream.close
raise
end
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
def read_response
version, status, reason = read_line.split(/\s+/, 3)
headers = read_headers
body = read_body(headers)
@count += 1
@persistent = persistent?(headers)
return version, Integer(status), reason, headers, body
end
def read_request
method, path, version = read_line.split(/\s+/, 3)
headers = read_headers
body = read_body(headers)
@count += 1
return headers.delete(HOST), method, path, version, headers, body
end
def write_response(version, status, headers, body)
@stream.write("#{version} #{status}\r\n")
write_headers(headers)
write_body(body)
@stream.flush
end
protected
def write_persistent_header
@stream.write("Connection: close\r\n") unless @persistent
end
def write_headers(headers)
headers.each do |name, value|
@stream.write("#{name}: #{value}\r\n")
end
write_persistent_header
end
def read_headers
fields = []
each_line do |line|
if line =~ /^([a-zA-Z\-]+):\s*(.+?)\s*$/
fields << [$1, $2]
else
break
end
end
return Headers.new(fields)
end
def write_body(body, chunked = true)
if body.nil? or body.empty?
@stream.write("Content-Length: 0\r\n\r\n")
body.read if body
elsif length = body.length
@stream.write("Content-Length: #{length}\r\n\r\n")
body.each do |chunk|
@stream.write(chunk)
end
elsif chunked
@stream.write("Transfer-Encoding: chunked\r\n\r\n")
body.each do |chunk|
next if chunk.size == 0
@stream.write("#{chunk.bytesize.to_s(16).upcase}\r\n")
@stream.write(chunk)
@stream.write(CRLF)
@stream.flush
end
@stream.write("0\r\n\r\n")
else
body = Body::Buffered.for(body)
@stream.write("Content-Length: #{body.bytesize}\r\n\r\n")
body.each do |chunk|
@stream.write(chunk)
end
end
@stream.flush
end
TRANSFER_ENCODING = 'transfer-encoding'.freeze
CONTENT_LENGTH = 'content-length'.freeze
CHUNKED = 'chunked'.freeze
def chunked?(headers)
if transfer_encoding = headers[TRANSFER_ENCODING]
if transfer_encoding.count == 1
return transfer_encoding.first == CHUNKED
end
end
end
def read_body(headers)
if chunked?(headers)
return Body::Chunked.new(self)
elsif content_length = headers[CONTENT_LENGTH]
if content_length != 0
return Body::Fixed.new(@stream, Integer(content_length))
end
end
end
end
end
end
end