hash.js

    //I copied the hash value exactly from a tracker -- this is a hex
    //representation of the sha1sum of the info dictionary
var bigint = require('bigint'),
    hash = new Buffer('8ac3731ad4b039c05393b5404afa6e7397810b41', 'hex'),
    connection_id = new bigint('4497486125440'),
    buffer = new Buffer(36);


/* ( http://www.bittorrent.org/beps/bep_0015.html )

All values are send [sic] in network byte order (big endian).
...
scrape request (according to the BitTorrent BEP)

Offset          Size            Name            Value
0               64-bit integer  connection_id
8               32-bit integer  action          2 // scrape
12              32-bit integer  transaction_id
16 + 20 * n     20-byte string  info_hash
16 + 20 * N
*/

console.log(hash.length); // = 20

connection_id = connection_id.toBuffer({
    endian: 'big',
    size: 8
});
 connection_id.copy(buffer, 0, 8);
buffer.writeInt32BE(2     , 8);
buffer.writeInt32BE(12345 , 12);
          hash.copy(buffer, 16, 0 , 20);

//[Connect and transmit the message]

//The problem here is that no matter the tracker, no matter the torrent,
//no matter the hash, I always end up getting a response that's telling
//me that nobody's available for that torrent, which I know is false,
//since I've opened the torrent up through Transmission and verified
//that it's scraping at least some peers from the UDP tracker. What's
//the deal?