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" => [0, 1].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 def initialize(logger)
31 @buffer = ' ' * Const::CHUNK_SIZE # initial size, may grow
32 @parser = HttpParser.new
39 @body.close rescue nil
40 @body.close! rescue nil
44 # Does the majority of the IO processing. It has been written in
45 # Ruby using about 8 different IO processing strategies.
47 # It is currently carefully constructed to make sure that it gets
48 # the best possible performance for the common case: GET requests
49 # that are fully complete after a single read(2)
51 # Anyone who thinks they can make it faster is more than welcome to
54 # returns an environment hash suitable for Rack if successful
55 # This does minimal exception trapping and it is up to the caller
56 # to handle any socket errors (e.g. user aborted upload).
58 # From http://www.ietf.org/rfc/rfc3875:
59 # "Script authors should be aware that the REMOTE_ADDR and
60 # REMOTE_HOST meta-variables (see sections 4.1.8 and 4.1.9)
61 # may not identify the ultimate source of the request. They
62 # identify the client for the immediate request to the server;
63 # that client may be a proxy, gateway, or other intermediary
64 # acting on behalf of the actual source client."
65 @params[Const::REMOTE_ADDR] =
66 TCPSocket === socket ? socket.peeraddr.last : '127.0.0.1'
68 # short circuit the common case with small GET requests first
69 @parser.execute(@params, read_socket(socket)) and
70 return handle_body(socket)
72 data = @buffer.dup # read_socket will clobber @buffer
74 # Parser is not done, queue up more data to read and continue parsing
75 # an Exception thrown from the @parser will throw us out of the loop
77 data << read_socket(socket)
78 @parser.execute(@params, data) and return handle_body(socket)
80 rescue HttpParserError => e
81 @logger.error "HTTP parse error, malformed request " \
82 "(#{@params[Const::HTTP_X_FORWARDED_FOR] ||
83 @params[Const::REMOTE_ADDR]}): #{e.inspect}"
84 @logger.error "REQUEST DATA: #{data.inspect}\n---\n" \
85 "PARAMS: #{@params.inspect}\n---\n"
91 # Handles dealing with the rest of the request
92 # returns a Rack environment if successful, raises an exception if not
93 def handle_body(socket)
94 http_body = @params.delete(:http_body)
95 content_length = @params[Const::CONTENT_LENGTH].to_i
96 remain = content_length - http_body.length
98 # must read more data to complete body
99 @body = remain < Const::MAX_BODY ? StringIO.new : Tempfile.new('unicorn')
102 @body.syswrite(http_body)
104 # Some clients (like FF1.0) report 0 for body and then send a body.
105 # This will probably truncate them but at least the request goes through
107 read_body(socket, remain) if remain > 0
109 @body.sysseek(0) if @body.respond_to?(:sysseek)
111 # in case read_body overread because the client tried to pipeline
112 # another request, we'll truncate it. Again, we don't do pipelining
114 @body.truncate(content_length)
118 # Returns an environment which is rackable:
119 # http://rack.rubyforge.org/doc/files/SPEC.html
120 # Based on Rack's old Mongrel handler.
122 # I'm considering enabling "unicorn.client". It gives
123 # applications some rope to do some "interesting" things like
124 # replacing a worker with another process that has full control
125 # over the HTTP response.
126 # @params["unicorn.client"] = socket
128 @params[Const::RACK_INPUT] = @body
129 @params.update(DEF_PARAMS)
132 # Does the heavy lifting of properly reading the larger body requests in
133 # small chunks. It expects @body to be an IO object, socket to be valid,
134 # It also expects any initial part of the body that has been read to be in
135 # the @body already. It will return true if successful and false if not.
136 def read_body(socket, remain)
138 # writes always write the requested amount on a POSIX filesystem
139 remain -= @body.syswrite(read_socket(socket))
142 @logger.error "Error reading HTTP body: #{e.inspect}"
144 # Any errors means we should delete the file, including if the file
145 # is dumped. Truncate it ASAP to help avoid page flushes to disk.
146 @body.truncate(0) rescue nil
151 # read(2) on "slow" devices like sockets can be interrupted by signals
152 def read_socket(socket)
154 socket.sysread(Const::CHUNK_SIZE, @buffer)