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.
15 # default parameters we merge into the request env for Rack handlers
17 "rack.errors" => $stderr,
18 "rack.multiprocess" => true,
19 "rack.multithread" => false,
20 "rack.run_once" => false,
21 "rack.version" => [1, 0].freeze,
22 "SCRIPT_NAME" => "".freeze,
24 # this is not in the Rack spec, but some apps may rely on it
25 "SERVER_SOFTWARE" => "Unicorn #{Const::UNICORN_VERSION}".freeze
28 # Optimize for the common case where there's no request body
29 # (GET/HEAD) requests.
30 NULL_IO = StringIO.new
31 LOCALHOST = '127.0.0.1'.freeze
33 # Being explicitly single-threaded, we have certain advantages in
34 # not having to worry about variables being clobbered :)
35 BUFFER = ' ' * Const::CHUNK_SIZE # initial size, may grow
36 PARSER = HttpParser.new
39 def initialize(logger)
45 input = PARAMS[Const::RACK_INPUT]
47 input.close rescue nil
48 input.close! rescue nil
54 # Does the majority of the IO processing. It has been written in
55 # Ruby using about 8 different IO processing strategies.
57 # It is currently carefully constructed to make sure that it gets
58 # the best possible performance for the common case: GET requests
59 # that are fully complete after a single read(2)
61 # Anyone who thinks they can make it faster is more than welcome to
64 # returns an environment hash suitable for Rack if successful
65 # This does minimal exception trapping and it is up to the caller
66 # to handle any socket errors (e.g. user aborted upload).
68 # From http://www.ietf.org/rfc/rfc3875:
69 # "Script authors should be aware that the REMOTE_ADDR and
70 # REMOTE_HOST meta-variables (see sections 4.1.8 and 4.1.9)
71 # may not identify the ultimate source of the request. They
72 # identify the client for the immediate request to the server;
73 # that client may be a proxy, gateway, or other intermediary
74 # acting on behalf of the actual source client."
75 PARAMS[Const::REMOTE_ADDR] =
76 TCPSocket === socket ? socket.peeraddr.last : LOCALHOST
78 # short circuit the common case with small GET requests first
79 PARSER.execute(PARAMS, read_socket(socket)) and
80 return handle_body(socket)
82 data = BUFFER.dup # read_socket will clobber BUFFER
84 # Parser is not done, queue up more data to read and continue parsing
85 # an Exception thrown from the PARSER will throw us out of the loop
87 data << read_socket(socket)
88 PARSER.execute(PARAMS, data) and return handle_body(socket)
90 rescue HttpParserError => e
91 @logger.error "HTTP parse error, malformed request " \
92 "(#{PARAMS[Const::HTTP_X_FORWARDED_FOR] ||
93 PARAMS[Const::REMOTE_ADDR]}): #{e.inspect}"
94 @logger.error "REQUEST DATA: #{data.inspect}\n---\n" \
95 "PARAMS: #{PARAMS.inspect}\n---\n"
101 # Handles dealing with the rest of the request
102 # returns a Rack environment if successful, raises an exception if not
103 def handle_body(socket)
104 http_body = PARAMS.delete(:http_body)
105 content_length = PARAMS[Const::CONTENT_LENGTH].to_i
107 if content_length == 0 # short circuit the common case
108 PARAMS[Const::RACK_INPUT] = NULL_IO.closed? ? NULL_IO.reopen : NULL_IO
109 return PARAMS.update(DEF_PARAMS)
112 # must read more data to complete body
113 remain = content_length - http_body.length
115 body = PARAMS[Const::RACK_INPUT] = (remain < Const::MAX_BODY) ?
116 StringIO.new : Tempfile.new('unicorn')
120 body.syswrite(http_body)
122 # Some clients (like FF1.0) report 0 for body and then send a body.
123 # This will probably truncate them but at least the request goes through
125 read_body(socket, remain, body) if remain > 0
127 body.sysseek(0) if body.respond_to?(:sysseek)
129 # in case read_body overread because the client tried to pipeline
130 # another request, we'll truncate it. Again, we don't do pipelining
132 body.truncate(content_length)
133 PARAMS.update(DEF_PARAMS)
136 # Does the heavy lifting of properly reading the larger body
137 # requests in small chunks. It expects PARAMS['rack.input'] to be
138 # an IO object, socket to be valid, It also expects any initial part
139 # of the body that has been read to be in the PARAMS['rack.input']
140 # already. It will return true if successful and false if not.
141 def read_body(socket, remain, body)
143 # writes always write the requested amount on a POSIX filesystem
144 remain -= body.syswrite(read_socket(socket))
147 @logger.error "Error reading HTTP body: #{e.inspect}"
149 # Any errors means we should delete the file, including if the file
150 # is dumped. Truncate it ASAP to help avoid page flushes to disk.
151 body.truncate(0) rescue nil
156 # read(2) on "slow" devices like sockets can be interrupted by signals
157 def read_socket(socket)
159 socket.sysread(Const::CHUNK_SIZE, BUFFER)