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#!/usr/bin/env pythonimport libtorrent as ltimport sysimport osimport timefrom optparse import OptionParserimport socketimport structimport fcntldef get_interface_ip(ifname):    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)    return socket.inet_ntoa(fcntl.ioctl(s.fileno(), 0x8915, struct.pack('256s',                            ifname[:15]))[20:24])def ip2long(ip):    return reduce(lambda a,b:(a<<8)+b,[int(i) for i in ip.split('.')])def get_wan_ip_address():    interfaces = set(['eth0', 'eth1', 'eth2', 'eth3', 'em1', 'em2', 'em3', 'em4'])    ip = ''    for i in interfaces:        try:            ip = get_interface_ip(i)            if (ip2long(ip) < ip2long('10.0.0.0') or ip2long(ip) > ip2long('10.255.255.255')) \                and (ip2long(ip) < ip2long('172.16.0.0') or ip2long(ip) > ip2long('172.33.255.255')) \                and (ip2long(ip) < ip2long('192.168.0.0') or ip2long(ip) > ip2long('192.168.255.255')):                return ip        except:            pass    return ipdef make_torrent(path, save):    fs = lt.file_storage()    lt.add_files(fs, path)    if fs.num_files() == 0:        print 'no files added'        sys.exit(1)    input = os.path.abspath(path)    basename = os.path.basename(path)    t = lt.create_torrent(fs, 0, 4 * 1024 * 1024)    t.add_tracker("http://10.0.1.5:8760/announce")    t.set_creator('libtorrent %s' % lt.version)    lt.set_piece_hashes(t, os.path.split(input)[0], lambda x: sys.stderr.write('.'))    sys.stderr.write('\n')    save = os.path.dirname(input)    save = "%s/%s.torrent" % (save, basename)    f=open(save, "wb")    f.write(lt.bencode(t.generate()))    f.close()    print "the bt torrent file is store at %s" % savedef dl_status(handle):    while not (handle.is_seed()):        s = handle.status()        state_str = ['queued', 'checking', 'downloading metadata', \                'downloading', 'finished', 'seeding', 'allocating', 'checking fastresume']        print '\ractive_time: %d, %.2f%% complete (down: %.1f kb/s up: %.1f kB/s peers: %d, seeds: %d) %s' % \                (s.active_time, s.progress * 100, s.download_rate / 1000, s.upload_rate / 1000, \                s.num_peers, s.num_seeds, state_str[s.state]),        sys.stdout.flush()        time.sleep(1)def seed_status(handle, seedtime=100):    seedtime = int(seedtime)    if seedtime < 100:        seedtime = 100    while seedtime > 0:        seedtime -= 1        s = handle.status()        state_str = ['queued', 'checking', 'downloading metadata', \                'downloading', 'finished', 'seeding', 'allocating', 'checking fastresume']        print '\rseed_time: %d, %.2f%% complete (down: %.1f kb/s up: %.1f kB/s peers: %d, seeds: %d) %s' % \                (s.active_time, s.progress * 100, s.download_rate / 1000, s.upload_rate / 1000, \                s.num_peers, s.num_seeds, state_str[s.state]),        sys.stdout.flush()        time.sleep(1)def remove_torrents(torrent, session):    session.remove_torrent(torrent)def read_alerts(session):    alert = session.pop_alert()    while alert:        #print alert, alert.message()        alert = session.pop_alert()def download(torrent, path, upload_rate_limit=0, seedtime=100):    try:        session = lt.session()        session.set_alert_queue_size_limit(1024 * 1024)        sts = lt.session_settings()        sts.ssl_listen = False        sts.user_agent = "Thunder deploy system"        sts.tracker_completion_timeout = 5        sts.tracker_receive_timeout = 5        sts.stop_tracker_timeout = 5        sts.active_downloads = -1        sts.active_seeds = -1        sts.active_limit = -1        sts.auto_scrape_min_interval = 5        sts.udp_tracker_token_expiry = 120        sts.min_announce_interval = 1        sts.inactivity_timeout = 60        sts.connection_speed = 10        sts.allow_multiple_connections_per_ip = True        sts.max_out_request_queue = 128        sts.request_queue_size = 3        sts.use_read_cache = False        session.set_settings(sts)        session.set_alert_mask(lt.alert.category_t.tracker_notification | lt.alert.category_t.status_notification)        session.set_alert_mask(lt.alert.category_t.status_notification)        ipaddr = get_wan_ip_address()        #print ipaddr        if ipaddr == "":            session.listen_on(6881, 6881)        else:            session.listen_on(6881, 6881, ipaddr)        limit = int(upload_rate_limit)        if limit>=100:            session.set_upload_rate_limit(limit*1024)            session.set_local_upload_rate_limit(limit*1024)        print session.upload_rate_limit()        torrent_info = lt.torrent_info(torrent)        add_params = {            'save_path': path,            'storage_mode': lt.storage_mode_t.storage_mode_sparse,            'paused': False,            'auto_managed': True,            'ti': torrent_info,        }        handle = session.add_torrent(add_params)        read_alerts(session)        st = time.time()        dl_status(handle)        et = time.time() - st        print '\nall file download in %.2f\nstart to seeding\n' % et        sys.stdout.write('\n')        handle.super_seeding()        seed_status(handle, seedtime)        remove_torrents(handle, session)        assert len(session.get_torrents()) == 0    finally:        print 'download finished'if __name__ == '__main__':    usage = "usage: %prog [options] \n \      %prog -d -f <torrent file=""> -s <file save="" path="">\n \      or \n \      %prog -m -p <file or="" dir=""> -s <torrent save="" path="">\n"    parser = OptionParser(usage=usage)    parser.add_option("-d", "--download", dest="download",            help="start to download file", action="store_false", default=True)    parser.add_option("-f", "--file", dest="file",            help="torrent file")    parser.add_option("-u", "--upload", dest="upload",            help="set upload rate limit, default is not limit", default=0)    parser.add_option("-t", "--time", dest="time",            help="set seed time, default is 100s", default=100)    parser.add_option("-p", "--path", dest="path",            help="to make torrent with this path")    parser.add_option("-m", "--make", dest="make",            help="make torrent", action="store_false", default=True)    parser.add_option("-s", "--save", dest="save",            help="file save path, default is store to ./", default="./")    (options, args) = parser.parse_args()    #download(sys.argv[1])    if len(sys.argv) != 6 and len(sys.argv) != 4 and len(sys.argv) != 8 and len(sys.argv) != 10:        parser.print_help()        sys.exit()    if options.download == False and options.file !="":        download(options.file, options.save, options.upload, options.time)    elif options.make == False and options.path != "":        make_torrent(options.path, options.save)</torrent></file></file></torrent>

准备环境

需要在所有的os上面安装一个libtorrent的库，下载地址：

http://code.google.com/p/libtorrent/downloads/list

记得编译的时候带上./configure –enable-python-binding，然后mak，make install，进入binding目录，make，make install就可以运行这个小的工具。当然大规模部署不可能采用每一台都去编译安装的方式，只要把编译出来的libtorrent.so libtorrent-rasterbar.so.7的文件跟bt.py这个文件放到同一个目录，另外写一个shell脚本。

lib=`dirname $0`export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$libpython bt.py -d -f <种子文件> -s <文件保存路径> -t <做种时间> -u <限制上传速度>

使用方法

首先在源服务器上面生成种子文件，如下：

python bt.py -m -p <要发布的文件或者文件夹> -s <种子保存地址>

发布文件

在源服务器上执行

python bt.py -d -f <种子文件> -s <文件保存路径> -t <做种时间> -u <限制上传速度>

其中做种时间默认设置是100s，上传速度默认不限制，限制速度的单位是kb

只要有一台机器完成了，就自动作为种子，在下载的过程中也会上传，任何一台机器都可以作为源服务器，当然了这里面还有中心的tracker服务器，脚本当中，我搭建了一个tracker源服务器，放到10.0.1.5端口是8760上面，当然大家也可以采用opentracker这个软件自己搭建一个tracker服务器，修改其中的源代码对应部分，另外考虑到发布都是私有文件，代码当作已经禁止了dht，如果还想更安全，就自己搭建一个私有的tracker server，具体搭建方法就使用一下搜索引擎，查找一下搭建的方法！

目前基本做到可以使用，后续考虑更简单一点，采用磁力链接的方式，这样就可以做到不用每台都要拷贝一个种子文件，采用一个单独的命令行就可以发布整个文件。

原文：http://www.4byte.cn/learning/14.html