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#! /usr/bin/python

# Written by Henry 'Pi' James
# see LICENSE.txt for license information

SPEW_SCROLL_RATE = 1

from BitTornado import PSYCO
if PSYCO.psyco:
    try:
        import psyco
        assert psyco.__version__ >= 0x010100f0
        psyco.full()
    except:
        pass

from BitTornado.download_bt1 import BT1Download, defaults, parse_params, get_usage, get_response
from BitTornado.RawServer import RawServer, UPnP_ERROR
from random import seed
from socket import error as socketerror
from BitTornado.bencode import bencode
from BitTornado.natpunch import UPnP_test
from threading import Event
from os.path import abspath
from signal import signal, SIGWINCH
try:
    from hashlib import sha1 as sha
except ImportError:
    from sha import sha
from sys import argv, exit
import sys
from time import time, strftime
from BitTornado.clock import clock
from BitTornado import createPeerID, version
from BitTornado.ConfigDir import ConfigDir

try:
    import curses
    import curses.panel
    from curses.wrapper import wrapper as curses_wrapper
    from signal import signal, SIGWINCH 
except:
    print 'Textmode GUI initialization failed, cannot proceed.'
    print
    print 'This download interface requires the standard Python module ' \
       '"curses", which is unfortunately not available for the native ' \
       'Windows port of Python. It is however available for the Cygwin ' \
       'port of Python, running on all Win32 systems (www.cygwin.com).'
    print
    print 'You may still use "btdownloadheadless.py" to download.'
    sys.exit(1)

assert sys.version >= '2', "Install Python 2.0 or greater"
try:
    True
except:
    True = 1
    False = 0

def fmttime(n):
    if n == 0:
        return 'download complete!'
    try:
        n = int(n)
        assert n >= 0 and n < 5184000  # 60 days
    except:
        return '<unknown>'
    m, s = divmod(n, 60)
    h, m = divmod(m, 60)
    return 'finishing in %d:%02d:%02d' % (h, m, s)

def fmtsize(n):
    s = str(n)
    size = s[-3:]
    while len(s) > 3:
        s = s[:-3]
        size = '%s,%s' % (s[-3:], size)
    if n > 999:
        unit = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB']
        i = 1
        while i + 1 < len(unit) and (n >> 10) >= 999:
            i += 1
            n >>= 10
        n = float(n) / (1 << 10)
	size = '%s (%.2f %s)' % (size, n, unit[i])
    return size


class CursesDisplayer:
    def __init__(self, scrwin, errlist, doneflag):
        self.scrwin = scrwin
        self.errlist = errlist
        self.doneflag = doneflag
        
        signal(SIGWINCH, self.winch_handler)
        self.changeflag = Event()

        self.done = 0
        self.file = ''
        self.fileSize = ''
        self.activity = ''
        self.status = ''
        self.progress = ''
        self.downloadTo = ''
        self.downRate = '---'
        self.upRate = '---'
        self.shareRating = ''
        self.seedStatus = ''
        self.peerStatus = ''
        self.errors = []
        self.last_update_time = 0
        self.spew_scroll_time = 0
        self.spew_scroll_pos = 0

        self._remake_window()

    def winch_handler(self, signum, stackframe):
        self.changeflag.set()
        curses.endwin()
        self.scrwin.refresh()
        self.scrwin = curses.newwin(0, 0, 0, 0)
        self._remake_window()

    def _remake_window(self):
        self.scrh, self.scrw = self.scrwin.getmaxyx()
        self.scrpan = curses.panel.new_panel(self.scrwin)
        self.labelh, self.labelw, self.labely, self.labelx = 11, 9, 1, 2
        self.labelwin = curses.newwin(self.labelh, self.labelw,
                                      self.labely, self.labelx)
        self.labelpan = curses.panel.new_panel(self.labelwin)
        self.fieldh, self.fieldw, self.fieldy, self.fieldx = (
                            self.labelh, self.scrw-2 - self.labelw-3,
                            1, self.labelw+3)
        self.fieldwin = curses.newwin(self.fieldh, self.fieldw,
                                      self.fieldy, self.fieldx)
        self.fieldwin.nodelay(1)
        self.fieldpan = curses.panel.new_panel(self.fieldwin)
        self.spewh, self.speww, self.spewy, self.spewx = (
            self.scrh - self.labelh - 2, self.scrw - 3, 1 + self.labelh, 2)
        self.spewwin = curses.newwin(self.spewh, self.speww,
                                     self.spewy, self.spewx)
        self.spewpan = curses.panel.new_panel(self.spewwin)
        try:
            self.scrwin.border(ord('|'),ord('|'),ord('-'),ord('-'),ord(' '),ord(' '),ord(' '),ord(' '))
        except:
            pass
        self.labelwin.addstr(0, 0, 'file:')
        self.labelwin.addstr(1, 0, 'size:')
        self.labelwin.addstr(2, 0, 'dest:')
        self.labelwin.addstr(3, 0, 'progress:')
        self.labelwin.addstr(4, 0, 'status:')
        self.labelwin.addstr(5, 0, 'dl speed:')
        self.labelwin.addstr(6, 0, 'ul speed:')
        self.labelwin.addstr(7, 0, 'sharing:')
        self.labelwin.addstr(8, 0, 'seeds:')
        self.labelwin.addstr(9, 0, 'peers:')
        curses.panel.update_panels()
        curses.doupdate()
        self.changeflag.clear()


    def finished(self):
        self.done = 1
        self.activity = 'download succeeded!'
        self.downRate = '---'
        self.display(fractionDone = 1)

    def failed(self, errormsg = None):
        self.done = 1
        self.activity = 'download failed!'
        self.downRate = '---'
        if errormsg:
            newerrmsg = strftime('[%H:%M:%S] ') + errormsg
            self.errors.append(newerrmsg)
            self.errlist.append(newerrmsg)
        self.display()

    def error(self, errormsg):
        newerrmsg = strftime('[%H:%M:%S] ') + errormsg
        self.errors.append(newerrmsg)
        self.errlist.append(newerrmsg)
        self.display()

    def display(self, dpflag = Event(), fractionDone = None, timeEst = None,
            downRate = None, upRate = None, activity = None,
            statistics = None, spew = None, **kws):

        inchar = self.fieldwin.getch()
        if inchar == 12: # ^L
            self._remake_window()
        elif inchar in (ord('q'),ord('Q')):
            self.doneflag.set()

        if activity is not None and not self.done:
            self.activity = activity
        elif timeEst is not None:
            self.activity = fmttime(timeEst)
        if self.changeflag.isSet():
            return
        if self.last_update_time + 0.1 > clock() and fractionDone not in (0.0, 1.0) and activity is not None:
            return
        self.last_update_time = clock()
        if fractionDone is not None:
            blocknum = int(self.fieldw * fractionDone)
            self.progress = blocknum * '#' + (self.fieldw - blocknum) * '_'
            self.status = '%s (%.1f%%)' % (self.activity, fractionDone * 100)
        else:
            self.status = self.activity
        if downRate is not None:
            self.downRate = '%.1f KB/s' % (float(downRate) / (1 << 10))
        if upRate is not None:
            self.upRate = '%.1f KB/s' % (float(upRate) / (1 << 10))
        if statistics is not None:
           if (statistics.shareRating < 0) or (statistics.shareRating > 100):
               self.shareRating = 'oo  (%.1f MB up / %.1f MB down)' % (float(statistics.upTotal) / (1<<20), float(statistics.downTotal) / (1<<20))
           else:
               self.shareRating = '%.3f  (%.1f MB up / %.1f MB down)' % (statistics.shareRating, float(statistics.upTotal) / (1<<20), float(statistics.downTotal) / (1<<20))
           if not self.done:
              self.seedStatus = '%d seen now, plus %.3f distributed copies' % (statistics.numSeeds,0.001*int(1000*statistics.numCopies2))
           else:
              self.seedStatus = '%d seen recently, plus %.3f distributed copies' % (statistics.numOldSeeds,0.001*int(1000*statistics.numCopies))
           self.peerStatus = '%d seen now, %.1f%% done at %.1f kB/s' % (statistics.numPeers,statistics.percentDone,float(statistics.torrentRate) / (1 << 10))

        self.fieldwin.erase()
        self.fieldwin.addnstr(0, 0, self.file, self.fieldw, curses.A_BOLD)
        self.fieldwin.addnstr(1, 0, self.fileSize, self.fieldw)
        self.fieldwin.addnstr(2, 0, self.downloadTo, self.fieldw)
        if self.progress:
            self.fieldwin.addnstr(3, 0, self.progress, self.fieldw, curses.A_BOLD)
        self.fieldwin.addnstr(4, 0, self.status, self.fieldw)
        self.fieldwin.addnstr(5, 0, self.downRate, self.fieldw)
        self.fieldwin.addnstr(6, 0, self.upRate, self.fieldw)
        self.fieldwin.addnstr(7, 0, self.shareRating, self.fieldw)
        self.fieldwin.addnstr(8, 0, self.seedStatus, self.fieldw)
        self.fieldwin.addnstr(9, 0, self.peerStatus, self.fieldw)

        self.spewwin.erase()

        if not spew:
            errsize = self.spewh
            if self.errors:
                self.spewwin.addnstr(0, 0, "error(s):", self.speww, curses.A_BOLD)
                errsize = len(self.errors)
                displaysize = min(errsize, self.spewh)
                displaytop = errsize - displaysize
                for i in range(displaysize):
                    self.spewwin.addnstr(i, self.labelw, self.errors[displaytop + i],
                                 self.speww-self.labelw-1, curses.A_BOLD)
        else:
            if self.errors:
                self.spewwin.addnstr(0, 0, "error:", self.speww, curses.A_BOLD)
                self.spewwin.addnstr(0, self.labelw, self.errors[-1],
                                 self.speww-self.labelw-1, curses.A_BOLD)
            self.spewwin.addnstr(2, 0, "  #     IP                 Upload           Download     Completed  Speed", self.speww, curses.A_BOLD)


            if self.spew_scroll_time + SPEW_SCROLL_RATE < clock():
                self.spew_scroll_time = clock()
                if len(spew) > self.spewh-5 or self.spew_scroll_pos > 0:
                    self.spew_scroll_pos += 1
            if self.spew_scroll_pos > len(spew):
                self.spew_scroll_pos = 0

            for i in range(len(spew)):
                spew[i]['lineno'] = i+1
            spew.append({'lineno': None})
            spew = spew[self.spew_scroll_pos:] + spew[:self.spew_scroll_pos]                
            
            for i in range(min(self.spewh - 5, len(spew))):
                if not spew[i]['lineno']:
                    continue
                self.spewwin.addnstr(i+3, 0, '%3d' % spew[i]['lineno'], 3)
                self.spewwin.addnstr(i+3, 4, spew[i]['ip']+spew[i]['direction'], 16)
                if spew[i]['uprate'] > 100:
                    self.spewwin.addnstr(i+3, 20, '%6.0f KB/s' % (float(spew[i]['uprate']) / 1000), 11)
                self.spewwin.addnstr(i+3, 32, '-----', 5)
                if spew[i]['uinterested'] == 1:
                    self.spewwin.addnstr(i+3, 33, 'I', 1)
                if spew[i]['uchoked'] == 1:
                    self.spewwin.addnstr(i+3, 35, 'C', 1)
                if spew[i]['downrate'] > 100:
                    self.spewwin.addnstr(i+3, 38, '%6.0f KB/s' % (float(spew[i]['downrate']) / 1000), 11)
                self.spewwin.addnstr(i+3, 50, '-------', 7)
                if spew[i]['dinterested'] == 1:
                    self.spewwin.addnstr(i+3, 51, 'I', 1)
                if spew[i]['dchoked'] == 1:
                    self.spewwin.addnstr(i+3, 53, 'C', 1)
                if spew[i]['snubbed'] == 1:
                    self.spewwin.addnstr(i+3, 55, 'S', 1)
                self.spewwin.addnstr(i+3, 58, '%5.1f%%' % (float(int(spew[i]['completed']*1000))/10), 6)
                if spew[i]['speed'] is not None:
                    self.spewwin.addnstr(i+3, 64, '%5.0f KB/s' % (float(spew[i]['speed'])/1000), 10)

            if statistics is not None:
                self.spewwin.addnstr(self.spewh-1, 0,
                        'downloading %d pieces, have %d fragments, %d of %d pieces completed'
                        % ( statistics.storage_active, statistics.storage_dirty,
                            statistics.storage_numcomplete,
                            statistics.storage_totalpieces ), self.speww-1 )

        curses.panel.update_panels()
        curses.doupdate()
        dpflag.set()

    def chooseFile(self, default, size, saveas, dir):
        self.file = default
        self.fileSize = fmtsize(size)
        if saveas == '':
            saveas = default
        self.downloadTo = abspath(saveas)
        return saveas

def run(scrwin, errlist, params):
    doneflag = Event()
    d = CursesDisplayer(scrwin, errlist, doneflag)
    try:
        while 1:
            configdir = ConfigDir('downloadcurses')
            defaultsToIgnore = ['responsefile', 'url', 'priority']
            configdir.setDefaults(defaults,defaultsToIgnore)
            configdefaults = configdir.loadConfig()
            defaults.append(('save_options',0,
             "whether to save the current options as the new default configuration " +
             "(only for btdownloadcurses.py)"))
            try:
                config = parse_params(params, configdefaults)
            except ValueError, e:
                d.error('error: ' + str(e) + '\nrun with no args for parameter explanations')
                break
            if not config:
                d.error(get_usage(defaults, d.fieldw, configdefaults))
                break
            if config['save_options']:
                configdir.saveConfig(config)
            configdir.deleteOldCacheData(config['expire_cache_data'])

            myid = createPeerID()
            seed(myid)

            rawserver = RawServer(doneflag, config['timeout_check_interval'],
                                  config['timeout'], ipv6_enable = config['ipv6_enabled'],
                                  failfunc = d.failed, errorfunc = d.error)

            upnp_type = 0
            while True:
                try:
                    listen_port = rawserver.find_and_bind(config['minport'], config['maxport'],
                                    config['bind'], ipv6_socket_style = config['ipv6_binds_v4'],
                                    upnp = upnp_type, randomizer = config['random_port'])
                    break
                except socketerror, e:
                    if upnp_type and e == UPnP_ERROR:
                        d.error('WARNING: COULD NOT FORWARD VIA UPnP')
                        upnp_type = 0
                        continue
                    d.error("Couldn't listen - " + str(e))
                    d.failed()
                    return

            response = get_response(config['responsefile'], config['url'], d.error)
            if not response:
                break

            infohash = sha(bencode(response['info'])).digest()
            
            dow = BT1Download(d.display, d.finished, d.error, d.error, doneflag,
                            config, response, infohash, myid, rawserver, listen_port,
                            configdir)
            
            if not dow.saveAs(d.chooseFile):
                break

            if not dow.initFiles(old_style = True):
                break
            if not dow.startEngine():
                dow.shutdown()
                break
            dow.startRerequester()
            dow.autoStats()

            if not dow.am_I_finished():
                d.display(activity = 'connecting to peers')
            rawserver.listen_forever(dow.getPortHandler())
            d.display(activity = 'shutting down')
            dow.shutdown()
            break

    except KeyboardInterrupt:
        # ^C to exit.. 
        pass 
    try:
        rawserver.shutdown()
    except:
        pass
    if not d.done:
        d.failed()


if __name__ == '__main__':
    if argv[1:] == ['--version']:
        print version
        exit(0)
    if len(argv) <= 1:
        print "Usage: btdownloadcurses.py <global options>\n"
        print get_usage(defaults)
        exit(1)

    errlist = []
    curses_wrapper(run, errlist, argv[1:])

    if errlist:
        print "These errors occurred during execution:"
        for error in errlist:
            print error