getscrapedata.py

来自「BitTorrentABC-Linux-V.2.4.3源码」· Python 代码 · 共 59 行

from BitTorrent.bencode import *
from BitTorrent.zurllib import urlopen
from sha import sha
import re
import binascii

def getScrapeData(metainfo, parent):
    announce = None
    
    # connect scrape at tracker and get data
    # save at self.currentpeer, self.currentseed
    # if error put '?'
    if metainfo is None:
        parent.currentseed = "?"
        parent.currentpeer = "?"
    else:
        info = metainfo['info']
        info_hash = sha(bencode(info))
        if metainfo.has_key('announce'):
            announce = metainfo['announce']
        else:
            announce = None
        if metainfo.has_key('announce-list'):
            announce_list = metainfo['announce-list']
        else:
            announce_list = None
        if announce is None and announce_list is not None :
            announce = annouce_list[0][0]
                        
        if announce is not None:
            p = re.compile( '(.*/)[^/]+')
            surl = p.sub (r'\1', announce)
            surl = surl + "scrape?info_hash="
            info_hash_hex = info_hash.hexdigest()
            hashlen = len(info_hash_hex)
            for i in range(0, hashlen):
                if (i % 2 == 0):
                    surl = surl + "%"
                surl = surl + info_hash_hex[i]
            # connect scrape URL
            try :
                h = urlopen(surl)
                scrapedata = h.read()
                h.close()
                scrapedata = bdecode(scrapedata)
                scrapedata = scrapedata['files']
                for i in scrapedata.keys():
                    if binascii.b2a_hex(i) == info_hash_hex:
                        parent.currentpeer = str(scrapedata[i]['incomplete'])
                        parent.currentseed = str(scrapedata[i]['complete'])
                        break
            except:
                parent.currentpeer = "?"
                parent.currentseed = "?"
        else:
            parent.currentpeer = "?"
            parent.currentseed = "?"