X-Git-Url: https://git.mxchange.org/?p=quix0rs-apt-p2p.git;a=blobdiff_plain;f=apt_p2p%2FPeerManager.py;h=cfc0f78103e5a2ce8fed2f0084d71cf2c8f253c3;hp=90a35c5493d3c1413d5f5794fdeb0e222b796fb9;hb=95453ed929f4b9faa3ddb4702ceea9d01784e0e6;hpb=b48cc5733b05137f106fd16d3bff9eaa756e9fb6 diff --git a/apt_p2p/PeerManager.py b/apt_p2p/PeerManager.py index 90a35c5..cfc0f78 100644 --- a/apt_p2p/PeerManager.py +++ b/apt_p2p/PeerManager.py @@ -11,187 +11,63 @@ from twisted.internet import reactor, defer from twisted.python import log from twisted.trial import unittest from twisted.web2 import stream -from twisted.web2.http import splitHostPort +from twisted.web2.http import Response, splitHostPort from HTTPDownloader import Peer +from Streams import GrowingFileStream, StreamToFile from util import uncompact -from hash import PIECE_SIZE +from Hash import PIECE_SIZE from apt_p2p_Khashmir.bencode import bdecode +from apt_p2p_conf import config -class GrowingFileStream(stream.FileStream): - """Modified to stream data from a file as it becomes available. +class PeerError(Exception): + """An error occurred downloading from peers.""" - @ivar CHUNK_SIZE: the maximum size of chunks of data to send at a time - @ivar deferred: waiting for the result of the last read attempt - @ivar available: the number of bytes that are currently available to read - @ivar position: the current position in the file where the next read will begin - @ivar finished: True when no more data will be coming available - """ - - CHUNK_SIZE = 4*1024 - - def __init__(self, f): - stream.FileStream.__init__(self, f) - self.length = None - self.deferred = None - self.available = 0L - self.position = 0L - self.finished = False - - def updateAvaliable(self, newlyAvailable): - """Update the number of bytes that are available. - - Call it with 0 to trigger reading of a fully read file. - - @param newlyAvailable: the number of bytes that just became available - """ - assert not self.finished - self.available += newlyAvailable - - # If a read is pending, let it go - if self.deferred and self.position < self.available: - # Try to read some data from the file - length = self.available - self.position - readSize = min(length, self.CHUNK_SIZE) - self.f.seek(self.position) - b = self.f.read(readSize) - bytesRead = len(b) - - # Check if end of file was reached - if bytesRead: - self.position += bytesRead - deferred = self.deferred - self.deferred = None - deferred.callback(b) - - def allAvailable(self): - """Indicate that no more data is coming available.""" - self.finished = True - - # If a read is pending, let it go - if self.deferred: - if self.position < self.available: - # Try to read some data from the file - length = self.available - self.position - readSize = min(length, self.CHUNK_SIZE) - self.f.seek(self.position) - b = self.f.read(readSize) - bytesRead = len(b) - - # Check if end of file was reached - if bytesRead: - self.position += bytesRead - deferred = self.deferred - self.deferred = None - deferred.callback(b) - else: - # We're done - deferred.callback(None) - else: - # We're done - deferred.callback(None) - - def read(self, sendfile=False): - assert not self.deferred, "A previous read is still deferred." - - if self.f is None: - return None - - length = self.available - self.position - readSize = min(length, self.CHUNK_SIZE) - - # If we don't have any available, we're done or deferred - if readSize <= 0: - if self.finished: - return None - else: - self.deferred = defer.Deferred() - return self.deferred - - # Try to read some data from the file - self.f.seek(self.position) - b = self.f.read(readSize) - bytesRead = len(b) - if not bytesRead: - # End of file was reached, we're done or deferred - if self.finished: - return None - else: - self.deferred = defer.Deferred() - return self.deferred - else: - self.position += bytesRead - return b - -class StreamToFile(defer.Deferred): - """Saves a stream to a file. - - @type stream: L{twisted.web2.stream.IByteStream} - @ivar stream: the input stream being read - @type outFile: L{twisted.python.filepath.FilePath} - @ivar outFile: the file being written - @type hash: L{Hash.HashObject} - @ivar hash: the hash object for the file - @type length: C{int} - @ivar length: the length of the original (compressed) file - @type doneDefer: L{twisted.internet.defer.Deferred} - @ivar doneDefer: the deferred that will fire when done streaming - """ - - def __init__(self, inputStream, outFile, hash, start, length): - """Initializes the file. - - @type inputStream: L{twisted.web2.stream.IByteStream} - @param inputStream: the input stream to read from - @type outFile: L{twisted.python.filepath.FilePath} - @param outFile: the file to write to - @type hash: L{Hash.HashObject} - @param hash: the hash object to use for the file - """ - self.stream = inputStream - self.outFile = outFile - self.hash = hash - self.hash.new() - self.length = self.stream.length - self.doneDefer = None - - def run(self): - """Start the streaming.""" - self.doneDefer = stream.readStream(self.stream, _gotData) - self.doneDefer.addCallbacks(self._done, self._error) - return self.doneDefer - - def _done(self): - """Close all the output files, return the result.""" - if not self.outFile.closed: - self.outFile.close() - self.hash.digest() - self.doneDefer.callback(self.hash) - - def _gotData(self, data): - if self.outFile.closed: - return - - if data is None: - self._done() - - # Write and hash the streamed data - self.outFile.write(data) - self.hash.update(data) - class FileDownload: """Manage a download from a list of peers or a mirror. - + @type manager: L{PeerManager} + @ivar manager: the manager to send requests for peers to + @type hash: L{Hash.HashObject} + @ivar hash: the hash object containing the expected hash for the file + @ivar mirror: the URI of the file on the mirror + @type compact_peers: C{list} of C{dictionary} + @ivar compact_peers: a list of the peer info where the file can be found + @type file: C{file} + @ivar file: the open file to right the download to + @type path: C{string} + @ivar path: the path to request from peers to access the file + @type pieces: C{list} of C{string} + @ivar pieces: the hashes of the pieces in the file + @type started: C{boolean} + @ivar started: whether the download has begun yet + @type defer: L{twisted.internet.defer.Deferred} + @ivar defer: the deferred that will callback with the result of the download + @type peers: C{dictionary} + @ivar peers: information about each of the peers available to download from + @type outstanding: C{int} + @ivar outstanding: the number of requests to peers currently outstanding + @type peerlist: C{list} of L{HTTPDownloader.Peer} + @ivar peerlist: the sorted list of peers for this download + @type stream: L{GrowingFileStream} + @ivar stream: the stream of resulting data from the download + @type nextFinish: C{int} + @ivar nextFinish: the next piece that is needed to finish for the stream + @type completePieces: C{list} of C{boolean} or L{HTTPDownloader.Peer} + @ivar completePieces: one per piece, will be False if no requests are + outstanding for the piece, True if the piece has been successfully + downloaded, or the Peer that a request for this piece has been sent """ def __init__(self, manager, hash, mirror, compact_peers, file): """Initialize the instance and check for piece hashes. + @type manager: L{PeerManager} + @param manager: the manager to send requests for peers to @type hash: L{Hash.HashObject} @param hash: the hash object containing the expected hash for the file @param mirror: the URI of the file on the mirror - @type compact_peers: C{list} of C{string} + @type compact_peers: C{list} of C{dictionary} @param compact_peers: a list of the peer info where the file can be found @type file: L{twisted.python.filepath.FilePath} @param file: the temporary file to use to store the downloaded file @@ -202,27 +78,30 @@ class FileDownload: self.compact_peers = compact_peers self.path = '/~/' + quote_plus(hash.expected()) + self.defer = None + self.mirror_path = None self.pieces = None self.started = False file.restat(False) if file.exists(): file.remove() - self.file = file.open('w') + self.file = file.open('w+') def run(self): """Start the downloading process.""" + log.msg('Checking for pieces for %s' % self.path) self.defer = defer.Deferred() self.peers = {} no_pieces = 0 - pieces_string = {} - pieces_hash = {} - pieces_dl_hash = {} + pieces_string = {0: 0} + pieces_hash = {0: 0} + pieces_dl_hash = {0: 0} for compact_peer in self.compact_peers: # Build a list of all the peers for this download site = uncompact(compact_peer['c']) - peer = manager.getPeer(site) + peer = self.manager.getPeer(site) self.peers.setdefault(site, {})['peer'] = peer # Extract any piece information from the peers list @@ -251,7 +130,8 @@ class FileDownload: if max_found == no_pieces: # The file is not split into pieces - self.pieces = [] + log.msg('No pieces were found for the file') + self.pieces = [self.hash.expected()] self.startDownload() elif max_found == max(pieces_string.values()): # Small number of pieces in a string @@ -259,6 +139,7 @@ class FileDownload: # Find the most popular piece string if num == max_found: self.pieces = [pieces[x:x+20] for x in xrange(0, len(pieces), 20)] + log.msg('Peer info contained %d piece hashes' % len(self.pieces)) self.startDownload() break elif max_found == max(pieces_hash.values()): @@ -266,13 +147,15 @@ class FileDownload: for pieces, num in pieces_hash.items(): # Find the most popular piece hash to lookup if num == max_found: + log.msg('Found a hash for pieces to lookup in the DHT: %r' % pieces) self.getDHTPieces(pieces) break elif max_found == max(pieces_dl_hash.values()): # Large number of pieces stored in peers - for pieces, num in pieces_hash.items(): + for pieces, num in pieces_dl_hash.items(): # Find the most popular piece hash to download if num == max_found: + log.msg('Found a hash for pieces to lookup in peers: %r' % pieces) self.getPeerPieces(pieces) break return self.defer @@ -289,24 +172,28 @@ class FileDownload: # del self.peers[site] # Start the DHT lookup - lookupDefer = self.manager.dht.getValue(key) - lookupDefer.addCallback(self._getDHTPieces, key) + lookupDefer = self.manager.dht.get(key) + lookupDefer.addBoth(self._getDHTPieces, key) def _getDHTPieces(self, results, key): """Check the retrieved values.""" - for result in results: - # Make sure the hash matches the key - result_hash = sha.new(result.get('t', '')).digest() - if result_hash == key: - pieces = result['t'] - self.pieces = [pieces[x:x+20] for x in xrange(0, len(pieces), 20)] - log.msg('Retrieved %d piece hashes from the DHT' % len(self.pieces)) - self.startDownload() - return + if isinstance(results, list): + for result in results: + # Make sure the hash matches the key + result_hash = sha.new(result.get('t', '')).digest() + if result_hash == key: + pieces = result['t'] + self.pieces = [pieces[x:x+20] for x in xrange(0, len(pieces), 20)] + log.msg('Retrieved %d piece hashes from the DHT' % len(self.pieces)) + self.startDownload() + return + + log.msg('Could not retrieve the piece hashes from the DHT') + else: + log.msg('Looking up piece hashes in the DHT resulted in an error: %r' % (result, )) # Continue without the piece hashes - log.msg('Could not retrieve the piece hashes from the DHT') - self.pieces = [] + self.pieces = [None for x in xrange(0, self.hash.expSize, PIECE_SIZE)] self.startDownload() def getPeerPieces(self, key, failedSite = None): @@ -315,12 +202,14 @@ class FileDownload: @param key: the key to request from the peers """ if failedSite is None: + log.msg('Starting the lookup of piece hashes in peers') self.outstanding = 0 # Remove any peers with the wrong piece hash #for site in self.peers.keys(): # if self.peers[site].get('l', '') != key: # del self.peers[site] else: + log.msg('Piece hash lookup failed for peer %r' % (failedSite, )) self.peers[failedSite]['failed'] = True self.outstanding -= 1 @@ -328,22 +217,26 @@ class FileDownload: # Send a request to one or more peers for site in self.peers: if self.peers[site].get('failed', False) != True: + log.msg('Sending a piece hash request to %r' % (site, )) path = '/~/' + quote_plus(key) lookupDefer = self.peers[site]['peer'].get(path) - lookupDefer.addCallbacks(self._getPeerPieces, self._gotPeerError, - callbackArgs=(key, site), errbackArgs=(key, site)) + reactor.callLater(0, lookupDefer.addCallbacks, + *(self._getPeerPieces, self._gotPeerError), + **{'callbackArgs': (key, site), + 'errbackArgs': (key, site)}) self.outstanding += 1 - if self.outstanding >= 3: + if self.outstanding >= 4: break - if self.pieces is None and self.outstanding == 0: + if self.pieces is None and self.outstanding <= 0: # Continue without the piece hashes log.msg('Could not retrieve the piece hashes from the peers') - self.pieces = [] + self.pieces = [None for x in xrange(0, self.hash.expSize, PIECE_SIZE)] self.startDownload() def _getPeerPieces(self, response, key, site): """Process the retrieved response from the peer.""" + log.msg('Got a piece hash response %d from %r' % (response.code, site)) if response.code != 200: # Request failed, try a different peer self.getPeerPieces(key, site) @@ -351,25 +244,31 @@ class FileDownload: # Read the response stream to a string self.peers[site]['pieces'] = '' def _gotPeerPiece(data, self = self, site = site): + log.msg('Peer %r got %d bytes of piece hashes' % (site, len(data))) self.peers[site]['pieces'] += data + log.msg('Streaming piece hashes from peer') df = stream.readStream(response.stream, _gotPeerPiece) df.addCallbacks(self._gotPeerPieces, self._gotPeerError, callbackArgs=(key, site), errbackArgs=(key, site)) def _gotPeerError(self, err, key, site): """Peer failed, try again.""" + log.msg('Peer piece hash request failed for %r' % (site, )) log.err(err) self.getPeerPieces(key, site) def _gotPeerPieces(self, result, key, site): """Check the retrieved pieces from the peer.""" + log.msg('Finished streaming piece hashes from peer %r' % (site, )) if self.pieces is not None: # Already done + log.msg('Already done') return try: result = bdecode(self.peers[site]['pieces']) except: + log.msg('Error bdecoding piece hashes') log.err() self.getPeerPieces(key, site) return @@ -378,7 +277,7 @@ class FileDownload: if result_hash == key: pieces = result['t'] self.pieces = [pieces[x:x+20] for x in xrange(0, len(pieces), 20)] - log.msg('Retrieved %d piece hashes from the peer' % len(self.pieces)) + log.msg('Retrieved %d piece hashes from the peer %r' % (len(self.pieces), site)) self.startDownload() else: log.msg('Peer returned a piece string that did not match') @@ -402,60 +301,164 @@ class FileDownload: if self.started: return + log.msg('Starting to download %s' % self.path) self.started = True - assert self.pieces is not None, "You must initialize the piece hashes first" + assert self.pieces, "You must initialize the piece hashes first" self.peerlist = [self.peers[site]['peer'] for site in self.peers] + # Use the mirror if there are few peers + if len(self.peerlist) < config.getint('DEFAULT', 'MIN_DOWNLOAD_PEERS'): + parsed = urlparse(self.mirror) + if parsed[0] == "http": + site = splitHostPort(parsed[0], parsed[1]) + self.mirror_path = urlunparse(('', '') + parsed[2:]) + peer = self.manager.getPeer(site, mirror = True) + self.peerlist.append(peer) + # Special case if there's only one good peer left - if len(self.peerlist) == 1: - log.msg('Downloading from peer %r' % (self.peerlist[0], )) - self.defer.callback(self.peerlist[0].get(self.path)) - return +# if len(self.peerlist) == 1: +# log.msg('Downloading from peer %r' % (self.peerlist[0], )) +# self.defer.callback(self.peerlist[0].get(self.path)) +# return - self.sort() + # Begin to download the pieces self.outstanding = 0 - self.next_piece = 0 - - while self.outstanding < 3 and self.peerlist and self.next_piece < len(self.pieces): - peer = self.peerlist.pop() - piece = self.next_piece - self.next_piece += 1 + self.nextFinish = 0 + self.completePieces = [False for piece in self.pieces] + self.getPieces() + + #{ Downloading the pieces + def getPieces(self): + """Download the next pieces from the peers.""" + if self.file.closed: + log.msg('Download has been aborted for %s' % self.path) + self.stream.allAvailable(remove = True) + return - self.outstanding += 1 - df = peer.getRange(self.path, piece*PIECE_SIZE, (piece+1)*PIECE_SIZE - 1) - df.addCallbacks(self._gotPiece, self._gotError, - callbackArgs=(piece, peer), errbackArgs=(piece, peer)) + self.sort() + piece = self.nextFinish + while self.outstanding < 4 and self.peerlist and piece < len(self.completePieces): + if self.completePieces[piece] == False: + # Send a request to the highest ranked peer + peer = self.peerlist.pop() + self.completePieces[piece] = peer + log.msg('Sending a request for piece %d to peer %r' % (piece, peer)) + + self.outstanding += 1 + path = self.path + if peer.mirror: + path = self.mirror_path + if len(self.completePieces) > 1: + df = peer.getRange(path, piece*PIECE_SIZE, (piece+1)*PIECE_SIZE - 1) + else: + df = peer.get(path) + reactor.callLater(0, df.addCallbacks, + *(self._getPiece, self._getError), + **{'callbackArgs': (piece, peer), + 'errbackArgs': (piece, peer)}) + piece += 1 + + # Check if we're done + if self.outstanding <= 0 and self.nextFinish >= len(self.completePieces): + log.msg('Download is complete for %s' % self.path) + self.stream.allAvailable(remove = True) - def _gotPiece(self, response, piece, peer): - """Process the retrieved piece from the peer.""" - if response.code != 206: + def _getPiece(self, response, piece, peer): + """Process the retrieved headers from the peer.""" + if ((len(self.completePieces) > 1 and response.code != 206) or + (response.code not in (200, 206))): # Request failed, try a different peer - self.getPeerPieces(key, site) + log.msg('Wrong response type %d for piece %d from peer %r' % (response.code, piece, peer)) + peer.hashError('Peer responded with the wrong type of download: %r' % response.code) + self.completePieces[piece] = False + if response.stream and response.stream.length: + stream.readAndDiscard(response.stream) else: - # Read the response stream to the file - df = StreamToFile(response.stream, self.file, self.hash, piece*PIECE_SIZE, PIECE_SIZE).run() - df.addCallbacks(self._gotPeerPieces, self._gotPeerError, - callbackArgs=(key, site), errbackArgs=(key, site)) + if self.defer: + # Start sending the return file + df = self.defer + self.defer = None + self.stream = GrowingFileStream(self.file, self.hash.expSize) + + # Get the headers from the peer's response + headers = {} + if response.headers.hasHeader('last-modified'): + headers['last-modified'] = response.headers.getHeader('last-modified') + resp = Response(200, headers, self.stream) + df.callback(resp) - def _gotError(self, err, piece, peer): + # Read the response stream to the file + log.msg('Streaming piece %d from peer %r' % (piece, peer)) + if response.code == 206: + df = StreamToFile(self.hash.newPieceHasher(), response.stream, + self.file, piece*PIECE_SIZE, PIECE_SIZE).run() + else: + df = StreamToFile(self.hash.newHasher(), response.stream, + self.file).run() + reactor.callLater(0, df.addCallbacks, + *(self._gotPiece, self._gotError), + **{'callbackArgs': (piece, peer), + 'errbackArgs': (piece, peer)}) + + self.outstanding -= 1 + self.peerlist.append(peer) + self.getPieces() + + def _getError(self, err, piece, peer): """Peer failed, try again.""" + log.msg('Got error for piece %d from peer %r' % (piece, peer)) + self.outstanding -= 1 + self.peerlist.append(peer) + self.completePieces[piece] = False + self.getPieces() log.err(err) + def _gotPiece(self, hash, piece, peer): + """Process the retrieved piece from the peer.""" + if self.pieces[piece] and hash.digest() != self.pieces[piece]: + # Hash doesn't match + log.msg('Hash error for piece %d from peer %r' % (piece, peer)) + peer.hashError('Piece received from peer does not match expected') + self.completePieces[piece] = False + else: + # Successfully completed one of several pieces + log.msg('Finished with piece %d from peer %r' % (piece, peer)) + self.completePieces[piece] = True + while (self.nextFinish < len(self.completePieces) and + self.completePieces[self.nextFinish] == True): + self.nextFinish += 1 + self.stream.updateAvailable(PIECE_SIZE) + + self.getPieces() + + def _gotError(self, err, piece, peer): + """Piece download failed, try again.""" + log.msg('Error streaming piece %d from peer %r: %r' % (piece, peer, err)) + log.err(err) + self.completePieces[piece] = False + self.getPieces() class PeerManager: """Manage a set of peers and the requests to them. + @type cache_dir: L{twisted.python.filepath.FilePath} + @ivar cache_dir: the directory to use for storing all files + @type dht: L{DHTManager.DHT} + @ivar dht: the DHT instance + @type stats: L{stats.StatsLogger} + @ivar stats: the statistics logger to record sent data to @type clients: C{dictionary} @ivar clients: the available peers that have been previously contacted """ - def __init__(self, cache_dir, dht): + def __init__(self, cache_dir, dht, stats): """Initialize the instance.""" self.cache_dir = cache_dir self.cache_dir.restat(False) if not self.cache_dir.exists(): self.cache_dir.makedirs() self.dht = dht + self.stats = stats self.clients = {} def get(self, hash, mirror, peers = [], method="GET", modtime=None): @@ -481,26 +484,30 @@ class PeerManager: assert parsed[0] == "http", "Only HTTP is supported, not '%s'" % parsed[0] site = splitHostPort(parsed[0], parsed[1]) path = urlunparse(('', '') + parsed[2:]) - peer = self.getPeer(site) + peer = self.getPeer(site, mirror = True) return peer.get(path, method, modtime) - elif len(peers) == 1: - site = uncompact(peers[0]['c']) - log.msg('Downloading from peer %r' % (site, )) - path = '/~/' + quote_plus(hash.expected()) - peer = self.getPeer(site) - return peer.get(path) +# elif len(peers) == 1: +# site = uncompact(peers[0]['c']) +# log.msg('Downloading from peer %r' % (site, )) +# path = '/~/' + quote_plus(hash.expected()) +# peer = self.getPeer(site) +# return peer.get(path) else: tmpfile = self.cache_dir.child(hash.hexexpected()) return FileDownload(self, hash, mirror, peers, tmpfile).run() - def getPeer(self, site): + def getPeer(self, site, mirror = False): """Create a new peer if necessary and return it. @type site: (C{string}, C{int}) @param site: the IP address and port of the peer + @param mirror: whether the peer is actually a mirror + (optional, defaults to False) """ if site not in self.clients: - self.clients[site] = Peer(site[0], site[1]) + self.clients[site] = Peer(site[0], site[1], self.stats) + if mirror: + self.clients[site].mirror = True return self.clients[site] def close(self): @@ -515,60 +522,6 @@ class TestPeerManager(unittest.TestCase): manager = None pending_calls = [] - def gotResp(self, resp, num, expect): - self.failUnless(resp.code >= 200 and resp.code < 300, "Got a non-200 response: %r" % resp.code) - if expect is not None: - self.failUnless(resp.stream.length == expect, "Length was incorrect, got %r, expected %r" % (resp.stream.length, expect)) - def print_(n): - pass - def printdone(n): - pass - stream.readStream(resp.stream, print_).addCallback(printdone) - - def test_download(self): - """Tests a normal download.""" - self.manager = PeerManager() - self.timeout = 10 - - host = 'www.ietf.org' - d = self.manager.get('', 'http://' + host + '/rfc/rfc0013.txt') - d.addCallback(self.gotResp, 1, 1070) - return d - - def test_head(self): - """Tests a 'HEAD' request.""" - self.manager = PeerManager() - self.timeout = 10 - - host = 'www.ietf.org' - d = self.manager.get('', 'http://' + host + '/rfc/rfc0013.txt', method = "HEAD") - d.addCallback(self.gotResp, 1, 0) - return d - - def test_multiple_downloads(self): - """Tests multiple downloads with queueing and connection closing.""" - self.manager = PeerManager() - self.timeout = 120 - lastDefer = defer.Deferred() - - def newRequest(host, path, num, expect, last=False): - d = self.manager.get('', 'http://' + host + ':' + str(80) + path) - d.addCallback(self.gotResp, num, expect) - if last: - d.addBoth(lastDefer.callback) - - newRequest('www.ietf.org', "/rfc/rfc0006.txt", 1, 1776) - newRequest('www.ietf.org', "/rfc/rfc2362.txt", 2, 159833) - newRequest('www.google.ca', "/", 3, None) - self.pending_calls.append(reactor.callLater(1, newRequest, 'www.sfu.ca', '/', 4, None)) - self.pending_calls.append(reactor.callLater(10, newRequest, 'www.ietf.org', '/rfc/rfc0048.txt', 5, 41696)) - self.pending_calls.append(reactor.callLater(30, newRequest, 'www.ietf.org', '/rfc/rfc0022.txt', 6, 4606)) - self.pending_calls.append(reactor.callLater(31, newRequest, 'www.sfu.ca', '/studentcentral/index.html', 7, None)) - self.pending_calls.append(reactor.callLater(32, newRequest, 'www.ietf.org', '/rfc/rfc0014.txt', 8, 27)) - self.pending_calls.append(reactor.callLater(32, newRequest, 'www.ietf.org', '/rfc/rfc0001.txt', 9, 21088)) - self.pending_calls.append(reactor.callLater(62, newRequest, 'www.google.ca', '/intl/en/options/', 0, None, True)) - return lastDefer - def tearDown(self): for p in self.pending_calls: if p.active():