From: Bertram Scharpf <lists@...>
Date: 2004-12-30T08:43:52+09:00
Subject: HTTP doesn't work. A bug?

Hi all,

downloading a larger file, I encounter this error message:

/usr/lib/ruby/1.8/net/protocol.rb:197:in `sysread': End of file reached (EOFError)
        from /usr/lib/ruby/1.8/net/protocol.rb:197:in `rbuf_fill'
        from /usr/lib/ruby/1.8/net/protocol.rb:196:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:55:in `timeout'
        from /usr/lib/ruby/1.8/net/protocol.rb:196:in `rbuf_fill'
        from /usr/lib/ruby/1.8/net/protocol.rb:160:in `readuntil'
        from /usr/lib/ruby/1.8/net/protocol.rb:171:in `readline'
        from /usr/lib/ruby/1.8/net/http.rb:1554:in `read_status_line'
        from /usr/lib/ruby/1.8/net/http.rb:1538:in `read_new'
        from /usr/lib/ruby/1.8/net/http.rb:833:in `request'
        from /usr/lib/ruby/1.8/net/http.rb:734:in `request_get'
        from ./mautdaten.rb:154:in `getfile'
        from ./mautdaten.rb:252:in `loadnewest'
        from ./mautdaten.rb:354

The program below does a straight download without any
errors, but when the same code is integrated in a larger
program, I get the error message. Sorry, I didn't manage to
find out where the message disappears when shortening the
code.

The error happens only with a download through a modem. In
my small home network everything works properly. I use
Apache 1.3.26. Outside, I tried to load from 1.3.29 and 2.0
versions.

What do I have to to?

Bertram


----------------------------------------
#!/usr/bin/env ruby

class StopDownload < Exception
end

class StoreLoaded

  def initialize( name, rfcdate, length)
    require 'time'
    lm = Time.httpdate rfcdate
    if  File.exist? name  then
      if  lm <= File.ctime( name)  and  length == File.size( name)  then
        raise StopDownload
      end
      File.delete name
    end
    @fileobj = File.new name, 'w'
    @fileobj.chmod 0444
  end

  def write( b)
    @fileobj.write b
  end

  def << ( buf)
    write buf
    self
  end

  def flush
  end

  def close
    @fileobj.close
    freeze
  end
end


class HTTPLoad

  def initialize host
    require 'net/http'
    @conn = Net::HTTP.new host
  end

  def getfile( path, cls)
    localfile = nil
    @conn.request_get path do |resp|
      if resp.code.to_i / 100 != 2 then
        raise Error, "`%s\': %03d, %s" % [path, resp.code, resp.msg]
      end
      begin
        localfile = cls.new 'localfile',
                      resp[ 'Last-Modified'], resp.content_length
        resp.read_body do |buf|
          localfile << buf
        end
        localfile.close
      rescue StopDownload
      end
    end
    localfile
  end

end


if __FILE__ == $0
  # The first site works always, the second only in this
  # shortened example.
  [['homer', '/another/maut/maut_55a.csv'],
   ['www.mauttabelle.de', '/maut_55a.csv']].each do |host,path|
    c = HTTPLoad.new( host)
    c.getfile path, StoreLoaded
  end
end
----------------------------------------

-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de