Class: Mongrel::HttpRequest

Inherits:
Object
  • Object
show all
Defined in:
lib/mongrel/http_request.rb

Overview

When a handler is found for a registered URI then this class is constructed and passed to your HttpHandler::process method. You should assume that one handler processes all requests. Included in the HttpRequest is a HttpRequest.params Hash that matches common CGI params, and a HttpRequest.body which is a string containing the request body (raw for now).

The HttpRequest.initialize method will convert any request that is larger than Const::MAX_BODY into a Tempfile and use that as the body. Otherwise it uses a StringIO object. To be safe, you should assume it works like a file.

The HttpHandler.request_notify system is implemented by having HttpRequest call HttpHandler.request_begins, HttpHandler.request_progress, HttpHandler.process during the IO processing. This adds a small amount of overhead but lets you implement finer controlled handlers and filters.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params, socket, dispatchers) ⇒ HttpRequest

You don’t really call this. It’s made for you. Main thing it does is hook up the params, and store any remaining body data into the HttpRequest.body attribute.



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# File 'lib/mongrel/http_request.rb', line 25

def initialize(params, socket, dispatchers)
  @params = params
  @socket = socket
  @dispatchers = dispatchers
  content_length = @params[Const::CONTENT_LENGTH].to_i
  remain = content_length - @params.http_body.length
  
  # tell all dispatchers the request has begun
  @dispatchers.each do |dispatcher|
    dispatcher.request_begins(@params) 
  end unless @dispatchers.nil? || @dispatchers.empty?

  # Some clients (like FF1.0) report 0 for body and then send a body.  This will probably truncate them but at least the request goes through usually.
  if remain <= 0
    # we've got everything, pack it up
    @body = StringIO.new
    @body.write @params.http_body
    update_request_progress(0, content_length)
  elsif remain > 0
    # must read more data to complete body
    if remain > Const::MAX_BODY
      # huge body, put it in a tempfile
      @body = Tempfile.new(Const::MONGREL_TMP_BASE)
      @body.binmode
    else
      # small body, just use that
      @body = StringIO.new 
    end

    @body.write @params.http_body
    read_body(remain, content_length)
  end

  @body.rewind if @body
end

Instance Attribute Details

#body ⇒ Object (readonly)

Returns the value of attribute body.



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# File 'lib/mongrel/http_request.rb', line 20

def body
  @body
end

#params ⇒ Object (readonly)

Returns the value of attribute params.



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# File 'lib/mongrel/http_request.rb', line 20

def params
  @params
end

Class Method Details

.escape(s) ⇒ Object

Performs URI escaping so that you can construct proper query strings faster. Use this rather than the cgi.rb version since it’s faster. (Stolen from Camping).



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# File 'lib/mongrel/http_request.rb', line 119

def self.escape(s)
  s.to_s.gsub(/([^ a-zA-Z0-9_.-]+)/n) {
    '%'+$1.unpack('H2'*$1.size).join('%').upcase
  }.tr(' ', '+') 
end

.query_parse(qs, d = '&;') ⇒ Object

Parses a query string by breaking it up at the ‘&’ and ‘;’ characters. You can also use this to parse cookies by changing the characters used in the second parameter (which defaults to ‘&;’.



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# File 'lib/mongrel/http_request.rb', line 137

def self.query_parse(qs, d = '&;')
  params = {}
  (qs||'').split(/[#{d}] */n).inject(params) { |h,p|
    k, v=unescape(p).split('=',2)
    if cur = params[k]
      if cur.class == Array
        params[k] << v
      else
        params[k] = [cur, v]
      end
    else
      params[k] = v
    end
  }

  return params
end

.unescape(s) ⇒ Object

Unescapes a URI escaped string. (Stolen from Camping).



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# File 'lib/mongrel/http_request.rb', line 127

def self.unescape(s)
  s.tr('+', ' ').gsub(/((?:%[0-9a-fA-F]{2})+)/n){
    [$1.delete('%')].pack('H*')
  } 
end

Instance Method Details

#read_body(remain, total) ⇒ Object

Does the heavy lifting of properly reading the larger body requests in small chunks. It expects @body to be an IO object, @socket to be valid, and will set @body = nil if the request fails. It also expects any initial part of the body that has been read to be in the @body already.



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# File 'lib/mongrel/http_request.rb', line 74

def read_body(remain, total)
  begin
    # write the odd sized chunk first
    @params.http_body = read_socket(remain % Const::CHUNK_SIZE)

    remain -= @body.write(@params.http_body)

    update_request_progress(remain, total)

    # then stream out nothing but perfectly sized chunks
    until remain <= 0 or @socket.closed?
      # ASSUME: we are writing to a disk and these writes always write the requested amount
      @params.http_body = read_socket(Const::CHUNK_SIZE)
      remain -= @body.write(@params.http_body)

      update_request_progress(remain, total)
    end
  rescue Object => e
    STDERR.puts "#{Time.now}: Error reading HTTP body: #{e.inspect}"
    STDERR.puts e.backtrace.join("\n")
    # any errors means we should delete the file, including if the file is dumped
    @socket.close rescue nil
    @body.delete if @body.class == Tempfile
    @body = nil # signals that there was a problem
  end
end

#read_socket(len) ⇒ Object 



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# File 'lib/mongrel/http_request.rb', line 101

def read_socket(len)
  if !@socket.closed?
    data = @socket.read(len)
    if !data
      raise "Socket read return nil"
    elsif data.length != len
      raise "Socket read returned insufficient data: #{data.length}"
    else
      data
    end
  else
    raise "Socket already closed when reading."
  end
end