Re: Re: enclosure status?

* Lucas Gonze <[email protected]> [2005-04-09 15:05-1000]
> 
> On Sat, 9 Apr 2005, Vadim Zaliva wrote:

> About Bittorrent in particular, that's a tough nut to crack because BT is 
> so contrary to web architecture.  There must be prior art for indirection 
> of that kind, though.  ?

In what way is BT contrary to webarch? http://www.w3.org/TR/webarch/
I guess the format of .torrent files is pretty inscrutable, where
webheads might put some/all of it into XML or XML/RDF. 

Rummaging around...

In http://www.bittorrent.com/protocol.html 

[[
"Metainfo files are bencoded dictionaries with the following keys:"

 announce

    The URL of the tracker.

info

    This maps to a dictionary, with keys described below. 

	The name key maps to a string which is the suggested name to save the
	file (or directory) as. It is purely advisory.

	piece length maps to the number of bytes in each piece the file is split
	into. For the purposes of transfer, files are split into fixed-size
	pieces which are all the same length except for possibly the last one
	which may be truncated. Piece length is almost always a power of two,
	most commonly 2 18 = 256 K (BitTorrent prior to version 3.2 uses 2 20 =
	1 M as default).

	pieces maps to a string whose length is a multiple of 20. It is to be
	subdivided into strings of length 20, each of which is the SHA1 hash of
	the piece at the corresponding index.

	There is also a key length or a key files , but not both or neither. If
	length is present then the download represents a single file, otherwise
	it represents a set of files which go in a directory structure.

	In the single file case, length maps to the length of the file in bytes.
	
	For the purposes of the other keys, the multi-file case is treated as
	only having a single file by concatenating the files in the order they
	appear in the files list. The files list is the value files maps to, and
	is a list of dictionaries containing the following keys:

	length The length of the file, in bytes. path A list of strings
	corresponding to subdirectory names, the last of which is the actual
	file name (a zero length list is an error case).

	In the single file case, the name key is the name of a file, in the
	muliple file case, it's the name of a directory. 


]]

So I could imagine all that expressed in markup instead.

[[
Metainfo file and tracker responses are both sent in a simple,
efficient, and extensible format called bencoding (pronounced 'bee
encoding'). Bencoded messages are nested dictionaries and lists (as in
Python), which can contain strings and integers. Extensibility is
supported by ignoring unexpected dictionary keys, so additional optional
ones can be added later
]]


Grabbing from http://www.legaltorrents.com/index.htm

[[
danbri@fireball:~/Desktop$ more wired-creative-commons-cd.torrent
d8:announce42:http://www.legaltorrents.com:7070/announce13:creation
datei1098766145e4:infod5:filesld6:lengthi5848493e4:pathl32:01-beastie-boys-now-get-busy.mp3eed6:lengthi8484766e4:pathl31:02-david-byrne-my-fair-lady.mp3eed6:lengthi8044860e4:pathl26:03-zap-mama-wadidyusay.mp3eed6:lengthi12878571e4:pathl40:04-my-morning-jacket-one-big-holiday.mp3eed6:lengthi5928936e4:pathl20:05-spoon-revenge.mp3eed6:lengthi9528615e4:pathl27:06-gilberto-gil-oslodum.mp3eed6:lengthi8217290e4:pathl49:07-dan-the-automator-relaxation-spa-treatment.mp3eed6:lengthi10715627e4:pathl35:08-thievery-corporation-dc-3000.mp3eed6:lengthi6917415e4:pathl27:09-le-tigre-fake-french.mp3eed6:lengthi7693791e4:pathl43:10-paul-westerberg-looking-up-in-heaven.mp3eed6:lengthi7717832e4:pathl46:11-chuck-d-fine-arts-militia-no-meaning-no.mp3eed6:lengthi17020560e4:pathl51:12-the-rapture-sister-saviour-blackstrobe-remix.mp3eed6:lengthi17200259e4:pathl29:13-cornelius-wataridori-2.mp3eed6:lengthi8329130e4
 :pathl43:14-danger-mouse-jemini-what-u-sittin-on.mp3eed6:lengthi9621615e4:pathl30:15-dj-dolores-oslodum-2004.mp3eed6:lengthi6588280e4:pathl34:16-matmos-action-at-a-distance.mp3eed6:lengthi3992e4:pathl29:wired-creative-commons-cd.txteee4:name25:wired-creative-commons-cd12:piece
lengthi262144e6:pieces11520:
...
]]

OK that's kinda inscrutable, but I wouldn't sat it's at odds with 
the Web's architecture, and it could be mapped into other notations 
easily enough. And I don't think that downloading info from multiple
sources or the other protcol aspects is obviously counter to webarch
(unless it uses HTTP GET for un-RESTful interactions? is that it?).

cheers,

Dan


 
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