5 require 'unicorn/http11'
9 # The HttpRequest.initialize method will convert any request that is larger than
10 # Const::MAX_BODY into a Tempfile and use that as the body. Otherwise it uses
11 # a StringIO object. To be safe, you should assume it works like a file.
17 # default parameters we merge into the request env for Rack handlers
19 "rack.errors" => $stderr,
20 "rack.multiprocess" => true,
21 "rack.multithread" => false,
22 "rack.run_once" => false,
23 "rack.version" => [1, 0].freeze,
24 "SCRIPT_NAME" => "".freeze,
26 # this is not in the Rack spec, but some apps may rely on it
27 "SERVER_SOFTWARE" => "Unicorn #{Const::UNICORN_VERSION}".freeze
30 # Optimize for the common case where there's no request body
31 # (GET/HEAD) requests.
32 NULL_IO = StringIO.new
33 LOCALHOST = '127.0.0.1'.freeze
35 # Being explicitly single-threaded, we have certain advantages in
36 # not having to worry about variables being clobbered :)
37 BUFFER = ' ' * Const::CHUNK_SIZE # initial size, may grow
38 PARSER = HttpParser.new
41 def initialize(logger = Configurator::DEFAULT_LOGGER)
45 # Does the majority of the IO processing. It has been written in
46 # Ruby using about 8 different IO processing strategies.
48 # It is currently carefully constructed to make sure that it gets
49 # the best possible performance for the common case: GET requests
50 # that are fully complete after a single read(2)
52 # Anyone who thinks they can make it faster is more than welcome to
55 # returns an environment hash suitable for Rack if successful
56 # This does minimal exception trapping and it is up to the caller
57 # to handle any socket errors (e.g. user aborted upload).
60 unless NULL_IO == (input = PARAMS[Const::RACK_INPUT]) # unlikely
61 input.close rescue nil
62 input.close! rescue nil
67 # From http://www.ietf.org/rfc/rfc3875:
68 # "Script authors should be aware that the REMOTE_ADDR and
69 # REMOTE_HOST meta-variables (see sections 4.1.8 and 4.1.9)
70 # may not identify the ultimate source of the request. They
71 # identify the client for the immediate request to the server;
72 # that client may be a proxy, gateway, or other intermediary
73 # acting on behalf of the actual source client."
74 PARAMS[Const::REMOTE_ADDR] =
75 TCPSocket === socket ? socket.peeraddr.last : LOCALHOST
77 # short circuit the common case with small GET requests first
78 PARSER.execute(PARAMS, socket.readpartial(Const::CHUNK_SIZE, BUFFER)) and
79 return handle_body(socket)
81 data = BUFFER.dup # socket.readpartial will clobber BUFFER
83 # Parser is not done, queue up more data to read and continue parsing
84 # an Exception thrown from the PARSER will throw us out of the loop
86 data << socket.readpartial(Const::CHUNK_SIZE, BUFFER)
87 PARSER.execute(PARAMS, data) and return handle_body(socket)
89 rescue HttpParserError => e
90 @logger.error "HTTP parse error, malformed request " \
91 "(#{PARAMS[Const::HTTP_X_FORWARDED_FOR] ||
92 PARAMS[Const::REMOTE_ADDR]}): #{e.inspect}"
93 @logger.error "REQUEST DATA: #{data.inspect}\n---\n" \
94 "PARAMS: #{PARAMS.inspect}\n---\n"
100 # Handles dealing with the rest of the request
101 # returns a Rack environment if successful, raises an exception if not
102 def handle_body(socket)
103 http_body = PARAMS.delete(:http_body)
104 content_length = PARAMS[Const::CONTENT_LENGTH].to_i
106 if content_length == 0 # short circuit the common case
107 PARAMS[Const::RACK_INPUT] = NULL_IO.closed? ? NULL_IO.reopen : NULL_IO
108 return PARAMS.update(DEFAULTS)
111 # must read more data to complete body
112 remain = content_length - http_body.length
114 body = PARAMS[Const::RACK_INPUT] = (remain < Const::MAX_BODY) ?
115 StringIO.new : Tempfile.new('unicorn')
118 body.write(http_body)
120 # Some clients (like FF1.0) report 0 for body and then send a body.
121 # This will probably truncate them but at least the request goes through
123 read_body(socket, remain, body) if remain > 0
126 # in case read_body overread because the client tried to pipeline
127 # another request, we'll truncate it. Again, we don't do pipelining
129 body.truncate(content_length)
130 PARAMS.update(DEFAULTS)
133 # Does the heavy lifting of properly reading the larger body
134 # requests in small chunks. It expects PARAMS['rack.input'] to be
135 # an IO object, socket to be valid, It also expects any initial part
136 # of the body that has been read to be in the PARAMS['rack.input']
137 # already. It will return true if successful and false if not.
138 def read_body(socket, remain, body)
140 # write always writes the requested amount on a POSIX filesystem
141 remain -= body.write(socket.readpartial(Const::CHUNK_SIZE, BUFFER))
144 @logger.error "Error reading HTTP body: #{e.inspect}"
146 # Any errors means we should delete the file, including if the file
147 # is dumped. Truncate it ASAP to help avoid page flushes to disk.
148 body.truncate(0) rescue nil