6 require 'unicorn/http11'
10 # The HttpRequest.initialize method will convert any request that is larger than
11 # Const::MAX_BODY into a Tempfile and use that as the body. Otherwise it uses
12 # a StringIO object. To be safe, you should assume it works like a file.
16 # default parameters we merge into the request env for Rack handlers
18 "rack.errors" => $stderr,
19 "rack.multiprocess" => true,
20 "rack.multithread" => false,
21 "rack.run_once" => false,
22 "rack.url_scheme" => "http",
23 "rack.version" => [0, 1],
26 # this is not in the Rack spec, but some apps may rely on it
27 "SERVER_SOFTWARE" => "Unicorn #{Const::UNICORN_VERSION}"
30 def initialize(logger)
33 @buffer = ' ' * Const::CHUNK_SIZE # initial size, may grow
34 @parser = HttpParser.new
41 @body.close rescue nil
42 @body.close! rescue nil
46 # Does the majority of the IO processing. It has been written in
47 # Ruby using about 8 different IO processing strategies.
49 # It is currently carefully constructed to make sure that it gets
50 # the best possible performance for the common case: GET requests
51 # that are fully complete after a single read(2)
53 # Anyone who thinks they can make it faster is more than welcome to
56 # returns an environment hash suitable for Rack if successful
57 # This does minimal exception trapping and it is up to the caller
58 # to handle any socket errors (e.g. user aborted upload).
60 # short circuit the common case with small GET requests first
61 @parser.execute(@params, read_socket(socket)) and
62 return handle_body(socket)
64 data = @buffer.dup # read_socket will clobber @buffer
66 # Parser is not done, queue up more data to read and continue parsing
67 # an Exception thrown from the @parser will throw us out of the loop
69 data << read_socket(socket)
70 @parser.execute(@params, data) and return handle_body(socket)
72 rescue HttpParserError => e
73 @logger.error "HTTP parse error, malformed request " \
74 "(#{@params[Const::HTTP_X_FORWARDED_FOR] ||
75 socket.unicorn_peeraddr}): #{e.inspect}"
76 @logger.error "REQUEST DATA: #{data.inspect}\n---\n" \
77 "PARAMS: #{@params.inspect}\n---\n"
83 # Handles dealing with the rest of the request
84 # returns a Rack environment if successful, raises an exception if not
85 def handle_body(socket)
86 http_body = @params.delete(:http_body)
87 content_length = @params[Const::CONTENT_LENGTH].to_i
88 remain = content_length - http_body.length
90 # must read more data to complete body
91 if remain < Const::MAX_BODY
92 # small body, just use that
93 @body = StringIO.new(http_body)
94 else # huge body, put it in a tempfile
95 @body = Tempfile.new(Const::UNICORN_TMP_BASE)
98 @body.syswrite(http_body)
101 # Some clients (like FF1.0) report 0 for body and then send a body.
102 # This will probably truncate them but at least the request goes through
104 read_body(socket, remain) if remain > 0
106 @body.sysseek(0) if @body.respond_to?(:sysseek)
108 # in case read_body overread because the client tried to pipeline
109 # another request, we'll truncate it. Again, we don't do pipelining
111 @body.truncate(content_length)
115 # Returns an environment which is rackable:
116 # http://rack.rubyforge.org/doc/files/SPEC.html
117 # Based on Rack's old Mongrel handler.
119 # I'm considering enabling "unicorn.client". It gives
120 # applications some rope to do some "interesting" things like
121 # replacing a worker with another process that has full control
122 # over the HTTP response.
123 # @params["unicorn.client"] = socket
125 # From http://www.ietf.org/rfc/rfc3875:
126 # "Script authors should be aware that the REMOTE_ADDR and
127 # REMOTE_HOST meta-variables (see sections 4.1.8 and 4.1.9)
128 # may not identify the ultimate source of the request. They
129 # identify the client for the immediate request to the server;
130 # that client may be a proxy, gateway, or other intermediary
131 # acting on behalf of the actual source client."
132 @params[Const::REMOTE_ADDR] = socket.unicorn_peeraddr
134 # It might be a dumbass full host request header
135 @params[Const::PATH_INFO] = (
136 @params[Const::REQUEST_PATH] ||=
137 URI.parse(@params[Const::REQUEST_URI]).path) or
138 raise "No REQUEST_PATH"
140 @params[Const::QUERY_STRING] ||= ''
141 @params[Const::RACK_INPUT] = @body
142 @params.update(DEF_PARAMS)
145 # Does the heavy lifting of properly reading the larger body requests in
146 # small chunks. It expects @body to be an IO object, socket to be valid,
147 # It also expects any initial part of the body that has been read to be in
148 # the @body already. It will return true if successful and false if not.
149 def read_body(socket, remain)
151 # writes always write the requested amount on a POSIX filesystem
152 remain -= @body.syswrite(read_socket(socket))
155 @logger.error "Error reading HTTP body: #{e.inspect}"
157 # Any errors means we should delete the file, including if the file
158 # is dumped. Truncate it ASAP to help avoid page flushes to disk.
159 @body.truncate(0) rescue nil
164 # read(2) on "slow" devices like sockets can be interrupted by signals
165 def read_socket(socket)
167 socket.sysread(Const::CHUNK_SIZE, @buffer)